diff --git a/gstreamer-app/src/auto/app_sink.rs b/gstreamer-app/src/auto/app_sink.rs
index be233151f..518a3dd77 100644
--- a/gstreamer-app/src/auto/app_sink.rs
+++ b/gstreamer-app/src/auto/app_sink.rs
@@ -8,6 +8,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -165,7 +166,6 @@ impl AppSink {
             value
                 .get()
                 .expect("Return Value for property `buffer-list` getter")
-                .unwrap()
         }
     }
 
@@ -175,7 +175,7 @@ impl AppSink {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"buffer-list\0".as_ptr() as *const _,
-                glib::Value::from(&buffer_list).to_glib_none().0,
+                buffer_list.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-app/src/auto/app_src.rs b/gstreamer-app/src/auto/app_src.rs
index d9dcc4f5b..89f7e8b33 100644
--- a/gstreamer-app/src/auto/app_src.rs
+++ b/gstreamer-app/src/auto/app_src.rs
@@ -9,6 +9,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -119,7 +120,6 @@ impl AppSrc {
             value
                 .get()
                 .expect("Return Value for property `block` getter")
-                .unwrap()
         }
     }
 
@@ -129,7 +129,7 @@ impl AppSrc {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"block\0".as_ptr() as *const _,
-                glib::Value::from(&block).to_glib_none().0,
+                block.to_value().to_glib_none().0,
             );
         }
     }
@@ -146,7 +146,6 @@ impl AppSrc {
             value
                 .get()
                 .expect("Return Value for property `format` getter")
-                .unwrap()
         }
     }
 
@@ -156,7 +155,7 @@ impl AppSrc {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"format\0".as_ptr() as *const _,
-                glib::Value::from(&format).to_glib_none().0,
+                format.to_value().to_glib_none().0,
             );
         }
     }
@@ -175,7 +174,6 @@ impl AppSrc {
             value
                 .get()
                 .expect("Return Value for property `handle-segment-change` getter")
-                .unwrap()
         }
     }
 
@@ -187,7 +185,7 @@ impl AppSrc {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"handle-segment-change\0".as_ptr() as *const _,
-                glib::Value::from(&handle_segment_change).to_glib_none().0,
+                handle_segment_change.to_value().to_glib_none().0,
             );
         }
     }
@@ -204,7 +202,6 @@ impl AppSrc {
             value
                 .get()
                 .expect("Return Value for property `is-live` getter")
-                .unwrap()
         }
     }
 
@@ -214,7 +211,7 @@ impl AppSrc {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"is-live\0".as_ptr() as *const _,
-                glib::Value::from(&is_live).to_glib_none().0,
+                is_live.to_value().to_glib_none().0,
             );
         }
     }
@@ -231,7 +228,6 @@ impl AppSrc {
             value
                 .get()
                 .expect("Return Value for property `max-latency` getter")
-                .unwrap()
         }
     }
 
@@ -241,7 +237,7 @@ impl AppSrc {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"max-latency\0".as_ptr() as *const _,
-                glib::Value::from(&max_latency).to_glib_none().0,
+                max_latency.to_value().to_glib_none().0,
             );
         }
     }
@@ -258,7 +254,6 @@ impl AppSrc {
             value
                 .get()
                 .expect("Return Value for property `min-latency` getter")
-                .unwrap()
         }
     }
 
@@ -268,7 +263,7 @@ impl AppSrc {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"min-latency\0".as_ptr() as *const _,
-                glib::Value::from(&min_latency).to_glib_none().0,
+                min_latency.to_value().to_glib_none().0,
             );
         }
     }
@@ -285,7 +280,6 @@ impl AppSrc {
             value
                 .get()
                 .expect("Return Value for property `min-percent` getter")
-                .unwrap()
         }
     }
 
@@ -295,7 +289,7 @@ impl AppSrc {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"min-percent\0".as_ptr() as *const _,
-                glib::Value::from(&min_percent).to_glib_none().0,
+                min_percent.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-app/src/auto/enums.rs b/gstreamer-app/src/auto/enums.rs
index 582b7a87e..99d12c3a8 100644
--- a/gstreamer-app/src/auto/enums.rs
+++ b/gstreamer-app/src/auto/enums.rs
@@ -5,8 +5,7 @@
 
 use glib::translate::*;
 use glib::value::FromValue;
-use glib::value::FromValueOptional;
-use glib::value::SetValue;
+use glib::value::ToValue;
 use glib::StaticType;
 use glib::Type;
 
@@ -57,20 +56,29 @@ impl StaticType for AppStreamType {
     }
 }
 
-impl<'a> FromValueOptional<'a> for AppStreamType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for AppStreamType {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for AppStreamType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for AppStreamType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for AppStreamType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for AppStreamType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<AppStreamType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
diff --git a/gstreamer-app/src/auto/versions.txt b/gstreamer-app/src/auto/versions.txt
index cb68ef35f..a08888cb1 100644
--- a/gstreamer-app/src/auto/versions.txt
+++ b/gstreamer-app/src/auto/versions.txt
@@ -1,3 +1,3 @@
-Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
diff --git a/gstreamer-app/sys/build.rs b/gstreamer-app/sys/build.rs
index 4a1611df2..7831eedbf 100644
--- a/gstreamer-app/sys/build.rs
+++ b/gstreamer-app/sys/build.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-app/sys/src/lib.rs b/gstreamer-app/sys/src/lib.rs
index bfceffade..637b52efe 100644
--- a/gstreamer-app/sys/src/lib.rs
+++ b/gstreamer-app/sys/src/lib.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-app/sys/tests/abi.rs b/gstreamer-app/sys/tests/abi.rs
index 5b61f3d53..8f824e916 100644
--- a/gstreamer-app/sys/tests/abi.rs
+++ b/gstreamer-app/sys/tests/abi.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-app/sys/tests/constant.c b/gstreamer-app/sys/tests/constant.c
index c23276ac1..c2e5b145d 100644
--- a/gstreamer-app/sys/tests/constant.c
+++ b/gstreamer-app/sys/tests/constant.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-app/sys/tests/layout.c b/gstreamer-app/sys/tests/layout.c
index 92722ff49..27dbfb90c 100644
--- a/gstreamer-app/sys/tests/layout.c
+++ b/gstreamer-app/sys/tests/layout.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-audio/src/auto/audio_base_sink.rs b/gstreamer-audio/src/auto/audio_base_sink.rs
index 6b97cf54c..8b5d3cec4 100644
--- a/gstreamer-audio/src/auto/audio_base_sink.rs
+++ b/gstreamer-audio/src/auto/audio_base_sink.rs
@@ -9,6 +9,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -222,7 +223,6 @@ impl<O: IsA<AudioBaseSink>> AudioBaseSinkExt for O {
             value
                 .get()
                 .expect("Return Value for property `buffer-time` getter")
-                .unwrap()
         }
     }
 
@@ -231,7 +231,7 @@ impl<O: IsA<AudioBaseSink>> AudioBaseSinkExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"buffer-time\0".as_ptr() as *const _,
-                glib::Value::from(&buffer_time).to_glib_none().0,
+                buffer_time.to_value().to_glib_none().0,
             );
         }
     }
@@ -247,7 +247,6 @@ impl<O: IsA<AudioBaseSink>> AudioBaseSinkExt for O {
             value
                 .get()
                 .expect("Return Value for property `can-activate-pull` getter")
-                .unwrap()
         }
     }
 
@@ -256,7 +255,7 @@ impl<O: IsA<AudioBaseSink>> AudioBaseSinkExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"can-activate-pull\0".as_ptr() as *const _,
-                glib::Value::from(&can_activate_pull).to_glib_none().0,
+                can_activate_pull.to_value().to_glib_none().0,
             );
         }
     }
@@ -272,7 +271,6 @@ impl<O: IsA<AudioBaseSink>> AudioBaseSinkExt for O {
             value
                 .get()
                 .expect("Return Value for property `latency-time` getter")
-                .unwrap()
         }
     }
 
@@ -281,7 +279,7 @@ impl<O: IsA<AudioBaseSink>> AudioBaseSinkExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"latency-time\0".as_ptr() as *const _,
-                glib::Value::from(&latency_time).to_glib_none().0,
+                latency_time.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-audio/src/auto/audio_base_src.rs b/gstreamer-audio/src/auto/audio_base_src.rs
index 775d22089..60d96edd3 100644
--- a/gstreamer-audio/src/auto/audio_base_src.rs
+++ b/gstreamer-audio/src/auto/audio_base_src.rs
@@ -9,6 +9,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -131,7 +132,6 @@ impl<O: IsA<AudioBaseSrc>> AudioBaseSrcExt for O {
             value
                 .get()
                 .expect("Return Value for property `actual-buffer-time` getter")
-                .unwrap()
         }
     }
 
@@ -146,7 +146,6 @@ impl<O: IsA<AudioBaseSrc>> AudioBaseSrcExt for O {
             value
                 .get()
                 .expect("Return Value for property `actual-latency-time` getter")
-                .unwrap()
         }
     }
 
@@ -161,7 +160,6 @@ impl<O: IsA<AudioBaseSrc>> AudioBaseSrcExt for O {
             value
                 .get()
                 .expect("Return Value for property `buffer-time` getter")
-                .unwrap()
         }
     }
 
@@ -170,7 +168,7 @@ impl<O: IsA<AudioBaseSrc>> AudioBaseSrcExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"buffer-time\0".as_ptr() as *const _,
-                glib::Value::from(&buffer_time).to_glib_none().0,
+                buffer_time.to_value().to_glib_none().0,
             );
         }
     }
@@ -186,7 +184,6 @@ impl<O: IsA<AudioBaseSrc>> AudioBaseSrcExt for O {
             value
                 .get()
                 .expect("Return Value for property `latency-time` getter")
-                .unwrap()
         }
     }
 
@@ -195,7 +192,7 @@ impl<O: IsA<AudioBaseSrc>> AudioBaseSrcExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"latency-time\0".as_ptr() as *const _,
-                glib::Value::from(&latency_time).to_glib_none().0,
+                latency_time.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-audio/src/auto/enums.rs b/gstreamer-audio/src/auto/enums.rs
index 0eccf7ec2..e6a1eca46 100644
--- a/gstreamer-audio/src/auto/enums.rs
+++ b/gstreamer-audio/src/auto/enums.rs
@@ -5,8 +5,7 @@
 
 use glib::translate::*;
 use glib::value::FromValue;
-use glib::value::FromValueOptional;
-use glib::value::SetValue;
+use glib::value::ToValue;
 use glib::StaticType;
 use glib::Type;
 use std::fmt;
@@ -182,21 +181,30 @@ impl StaticType for AudioChannelPosition {
     }
 }
 
-impl<'a> FromValueOptional<'a> for AudioChannelPosition {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for AudioChannelPosition {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for AudioChannelPosition {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for AudioChannelPosition {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for AudioChannelPosition {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for AudioChannelPosition {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<AudioChannelPosition>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -251,21 +259,30 @@ impl StaticType for AudioDitherMethod {
     }
 }
 
-impl<'a> FromValueOptional<'a> for AudioDitherMethod {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for AudioDitherMethod {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for AudioDitherMethod {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for AudioDitherMethod {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for AudioDitherMethod {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for AudioDitherMethod {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<AudioDitherMethod>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -447,21 +464,30 @@ impl StaticType for AudioFormat {
     }
 }
 
-impl<'a> FromValueOptional<'a> for AudioFormat {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for AudioFormat {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for AudioFormat {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for AudioFormat {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for AudioFormat {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for AudioFormat {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<AudioFormat>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -508,21 +534,30 @@ impl StaticType for AudioLayout {
     }
 }
 
-impl<'a> FromValueOptional<'a> for AudioLayout {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for AudioLayout {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for AudioLayout {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for AudioLayout {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for AudioLayout {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for AudioLayout {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<AudioLayout>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -581,21 +616,30 @@ impl StaticType for AudioNoiseShapingMethod {
     }
 }
 
-impl<'a> FromValueOptional<'a> for AudioNoiseShapingMethod {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for AudioNoiseShapingMethod {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for AudioNoiseShapingMethod {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for AudioNoiseShapingMethod {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for AudioNoiseShapingMethod {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for AudioNoiseShapingMethod {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<AudioNoiseShapingMethod>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -666,25 +710,34 @@ impl StaticType for AudioResamplerMethod {
 
 #[cfg(any(feature = "v1_10", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_10")))]
-impl<'a> FromValueOptional<'a> for AudioResamplerMethod {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for AudioResamplerMethod {
+    type Type = Self;
 }
 
 #[cfg(any(feature = "v1_10", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_10")))]
-impl<'a> FromValue<'a> for AudioResamplerMethod {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for AudioResamplerMethod {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
 #[cfg(any(feature = "v1_10", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_10")))]
-impl SetValue for AudioResamplerMethod {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for AudioResamplerMethod {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<AudioResamplerMethod>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -799,21 +852,30 @@ impl StaticType for AudioRingBufferFormatType {
     }
 }
 
-impl<'a> FromValueOptional<'a> for AudioRingBufferFormatType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for AudioRingBufferFormatType {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for AudioRingBufferFormatType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for AudioRingBufferFormatType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for AudioRingBufferFormatType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for AudioRingBufferFormatType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<AudioRingBufferFormatType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
diff --git a/gstreamer-audio/src/auto/flags.rs b/gstreamer-audio/src/auto/flags.rs
index cfbe78cf6..6b1aa209e 100644
--- a/gstreamer-audio/src/auto/flags.rs
+++ b/gstreamer-audio/src/auto/flags.rs
@@ -6,8 +6,7 @@
 use bitflags::bitflags;
 use glib::translate::*;
 use glib::value::FromValue;
-use glib::value::FromValueOptional;
-use glib::value::SetValue;
+use glib::value::ToValue;
 use glib::StaticType;
 use glib::Type;
 
@@ -40,21 +39,30 @@ impl StaticType for AudioFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for AudioFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for AudioFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for AudioFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for AudioFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for AudioFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for AudioFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<AudioFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -91,21 +99,30 @@ impl StaticType for AudioFormatFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for AudioFormatFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for AudioFormatFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for AudioFormatFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for AudioFormatFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for AudioFormatFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for AudioFormatFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<AudioFormatFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -138,20 +155,29 @@ impl StaticType for AudioPackFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for AudioPackFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for AudioPackFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for AudioPackFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for AudioPackFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for AudioPackFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for AudioPackFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<AudioPackFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
diff --git a/gstreamer-audio/src/auto/versions.txt b/gstreamer-audio/src/auto/versions.txt
index cb68ef35f..a08888cb1 100644
--- a/gstreamer-audio/src/auto/versions.txt
+++ b/gstreamer-audio/src/auto/versions.txt
@@ -1,3 +1,3 @@
-Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
diff --git a/gstreamer-audio/sys/build.rs b/gstreamer-audio/sys/build.rs
index 4a1611df2..7831eedbf 100644
--- a/gstreamer-audio/sys/build.rs
+++ b/gstreamer-audio/sys/build.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-audio/sys/src/lib.rs b/gstreamer-audio/sys/src/lib.rs
index efd00f8e1..bff5b2204 100644
--- a/gstreamer-audio/sys/src/lib.rs
+++ b/gstreamer-audio/sys/src/lib.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-audio/sys/tests/abi.rs b/gstreamer-audio/sys/tests/abi.rs
index 9370dc80f..e639742b5 100644
--- a/gstreamer-audio/sys/tests/abi.rs
+++ b/gstreamer-audio/sys/tests/abi.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-audio/sys/tests/constant.c b/gstreamer-audio/sys/tests/constant.c
index 79263d2a5..b3bfa0a07 100644
--- a/gstreamer-audio/sys/tests/constant.c
+++ b/gstreamer-audio/sys/tests/constant.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-audio/sys/tests/layout.c b/gstreamer-audio/sys/tests/layout.c
index 12b330e66..754b4e9a9 100644
--- a/gstreamer-audio/sys/tests/layout.c
+++ b/gstreamer-audio/sys/tests/layout.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-base/src/auto/aggregator.rs b/gstreamer-base/src/auto/aggregator.rs
index 155569ff6..19653ec2e 100644
--- a/gstreamer-base/src/auto/aggregator.rs
+++ b/gstreamer-base/src/auto/aggregator.rs
@@ -15,6 +15,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -211,7 +212,6 @@ impl<O: IsA<Aggregator>> AggregatorExt for O {
             value
                 .get()
                 .expect("Return Value for property `emit-signals` getter")
-                .unwrap()
         }
     }
 
@@ -222,7 +222,7 @@ impl<O: IsA<Aggregator>> AggregatorExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"emit-signals\0".as_ptr() as *const _,
-                glib::Value::from(&emit_signals).to_glib_none().0,
+                emit_signals.to_value().to_glib_none().0,
             );
         }
     }
@@ -238,7 +238,6 @@ impl<O: IsA<Aggregator>> AggregatorExt for O {
             value
                 .get()
                 .expect("Return Value for property `start-time` getter")
-                .unwrap()
         }
     }
 
@@ -247,7 +246,7 @@ impl<O: IsA<Aggregator>> AggregatorExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"start-time\0".as_ptr() as *const _,
-                glib::Value::from(&start_time).to_glib_none().0,
+                start_time.to_value().to_glib_none().0,
             );
         }
     }
@@ -266,7 +265,6 @@ impl<O: IsA<Aggregator>> AggregatorExt for O {
             value
                 .get()
                 .expect("Return Value for property `start-time-selection` getter")
-                .unwrap()
         }
     }
 
@@ -277,7 +275,7 @@ impl<O: IsA<Aggregator>> AggregatorExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"start-time-selection\0".as_ptr() as *const _,
-                glib::Value::from(&start_time_selection).to_glib_none().0,
+                start_time_selection.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-base/src/auto/aggregator_pad.rs b/gstreamer-base/src/auto/aggregator_pad.rs
index c50bd893e..5d214b1d1 100644
--- a/gstreamer-base/src/auto/aggregator_pad.rs
+++ b/gstreamer-base/src/auto/aggregator_pad.rs
@@ -11,6 +11,9 @@ use glib::translate::*;
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
 use glib::StaticType;
+#[cfg(any(feature = "v1_16", feature = "dox"))]
+#[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -124,7 +127,6 @@ impl<O: IsA<AggregatorPad>> AggregatorPadExt for O {
             value
                 .get()
                 .expect("Return Value for property `emit-signals` getter")
-                .unwrap()
         }
     }
 
@@ -135,7 +137,7 @@ impl<O: IsA<AggregatorPad>> AggregatorPadExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"emit-signals\0".as_ptr() as *const _,
-                glib::Value::from(&emit_signals).to_glib_none().0,
+                emit_signals.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-base/src/auto/base_parse.rs b/gstreamer-base/src/auto/base_parse.rs
index 4380d1f58..a8f31ba09 100644
--- a/gstreamer-base/src/auto/base_parse.rs
+++ b/gstreamer-base/src/auto/base_parse.rs
@@ -9,6 +9,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -185,7 +186,6 @@ impl<O: IsA<BaseParse>> BaseParseExt for O {
             value
                 .get()
                 .expect("Return Value for property `disable-passthrough` getter")
-                .unwrap()
         }
     }
 
@@ -194,7 +194,7 @@ impl<O: IsA<BaseParse>> BaseParseExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"disable-passthrough\0".as_ptr() as *const _,
-                glib::Value::from(&disable_passthrough).to_glib_none().0,
+                disable_passthrough.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-base/src/auto/base_sink.rs b/gstreamer-base/src/auto/base_sink.rs
index dde1a0c98..70ebeb903 100644
--- a/gstreamer-base/src/auto/base_sink.rs
+++ b/gstreamer-base/src/auto/base_sink.rs
@@ -9,6 +9,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -407,7 +408,6 @@ impl<O: IsA<BaseSink>> BaseSinkExt for O {
             value
                 .get()
                 .expect("Return Value for property `async` getter")
-                .unwrap()
         }
     }
 
@@ -416,7 +416,7 @@ impl<O: IsA<BaseSink>> BaseSinkExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"async\0".as_ptr() as *const _,
-                glib::Value::from(&async_).to_glib_none().0,
+                async_.to_value().to_glib_none().0,
             );
         }
     }
@@ -432,7 +432,6 @@ impl<O: IsA<BaseSink>> BaseSinkExt for O {
             value
                 .get()
                 .expect("Return Value for property `enable-last-sample` getter")
-                .unwrap()
         }
     }
 
@@ -441,7 +440,7 @@ impl<O: IsA<BaseSink>> BaseSinkExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"enable-last-sample\0".as_ptr() as *const _,
-                glib::Value::from(&enable_last_sample).to_glib_none().0,
+                enable_last_sample.to_value().to_glib_none().0,
             );
         }
     }
@@ -454,10 +453,7 @@ impl<O: IsA<BaseSink>> BaseSinkExt for O {
                 b"qos\0".as_ptr() as *const _,
                 value.to_glib_none_mut().0,
             );
-            value
-                .get()
-                .expect("Return Value for property `qos` getter")
-                .unwrap()
+            value.get().expect("Return Value for property `qos` getter")
         }
     }
 
@@ -466,7 +462,7 @@ impl<O: IsA<BaseSink>> BaseSinkExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"qos\0".as_ptr() as *const _,
-                glib::Value::from(&qos).to_glib_none().0,
+                qos.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-base/src/auto/base_src.rs b/gstreamer-base/src/auto/base_src.rs
index c3ac5db2f..90230300e 100644
--- a/gstreamer-base/src/auto/base_src.rs
+++ b/gstreamer-base/src/auto/base_src.rs
@@ -9,6 +9,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -225,7 +226,6 @@ impl<O: IsA<BaseSrc>> BaseSrcExt for O {
             value
                 .get()
                 .expect("Return Value for property `num-buffers` getter")
-                .unwrap()
         }
     }
 
@@ -234,7 +234,7 @@ impl<O: IsA<BaseSrc>> BaseSrcExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"num-buffers\0".as_ptr() as *const _,
-                glib::Value::from(&num_buffers).to_glib_none().0,
+                num_buffers.to_value().to_glib_none().0,
             );
         }
     }
@@ -250,7 +250,6 @@ impl<O: IsA<BaseSrc>> BaseSrcExt for O {
             value
                 .get()
                 .expect("Return Value for property `typefind` getter")
-                .unwrap()
         }
     }
 
@@ -259,7 +258,7 @@ impl<O: IsA<BaseSrc>> BaseSrcExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"typefind\0".as_ptr() as *const _,
-                glib::Value::from(&typefind).to_glib_none().0,
+                typefind.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-base/src/auto/base_transform.rs b/gstreamer-base/src/auto/base_transform.rs
index 088e6c65f..809850289 100644
--- a/gstreamer-base/src/auto/base_transform.rs
+++ b/gstreamer-base/src/auto/base_transform.rs
@@ -9,6 +9,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -220,10 +221,7 @@ impl<O: IsA<BaseTransform>> BaseTransformExt for O {
                 b"qos\0".as_ptr() as *const _,
                 value.to_glib_none_mut().0,
             );
-            value
-                .get()
-                .expect("Return Value for property `qos` getter")
-                .unwrap()
+            value.get().expect("Return Value for property `qos` getter")
         }
     }
 
@@ -232,7 +230,7 @@ impl<O: IsA<BaseTransform>> BaseTransformExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"qos\0".as_ptr() as *const _,
-                glib::Value::from(&qos).to_glib_none().0,
+                qos.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-base/src/auto/enums.rs b/gstreamer-base/src/auto/enums.rs
index 09c19cec4..4745ed0db 100644
--- a/gstreamer-base/src/auto/enums.rs
+++ b/gstreamer-base/src/auto/enums.rs
@@ -11,10 +11,7 @@ use glib::translate::*;
 use glib::value::FromValue;
 #[cfg(any(feature = "v1_18", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_18")))]
-use glib::value::FromValueOptional;
-#[cfg(any(feature = "v1_18", feature = "dox"))]
-#[cfg_attr(feature = "dox", doc(cfg(feature = "v1_18")))]
-use glib::value::SetValue;
+use glib::value::ToValue;
 #[cfg(any(feature = "v1_18", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_18")))]
 use glib::StaticType;
@@ -79,24 +76,33 @@ impl StaticType for AggregatorStartTimeSelection {
 
 #[cfg(any(feature = "v1_18", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_18")))]
-impl<'a> FromValueOptional<'a> for AggregatorStartTimeSelection {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for AggregatorStartTimeSelection {
+    type Type = Self;
 }
 
 #[cfg(any(feature = "v1_18", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_18")))]
-impl<'a> FromValue<'a> for AggregatorStartTimeSelection {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for AggregatorStartTimeSelection {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
 #[cfg(any(feature = "v1_18", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_18")))]
-impl SetValue for AggregatorStartTimeSelection {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for AggregatorStartTimeSelection {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<AggregatorStartTimeSelection>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
diff --git a/gstreamer-base/src/auto/versions.txt b/gstreamer-base/src/auto/versions.txt
index cb68ef35f..a08888cb1 100644
--- a/gstreamer-base/src/auto/versions.txt
+++ b/gstreamer-base/src/auto/versions.txt
@@ -1,3 +1,3 @@
-Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
diff --git a/gstreamer-base/sys/build.rs b/gstreamer-base/sys/build.rs
index 4a1611df2..7831eedbf 100644
--- a/gstreamer-base/sys/build.rs
+++ b/gstreamer-base/sys/build.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-base/sys/src/lib.rs b/gstreamer-base/sys/src/lib.rs
index af3a7103e..eca7acbbb 100644
--- a/gstreamer-base/sys/src/lib.rs
+++ b/gstreamer-base/sys/src/lib.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-base/sys/tests/abi.rs b/gstreamer-base/sys/tests/abi.rs
index 20d0b36d4..4c8e28f78 100644
--- a/gstreamer-base/sys/tests/abi.rs
+++ b/gstreamer-base/sys/tests/abi.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-base/sys/tests/constant.c b/gstreamer-base/sys/tests/constant.c
index 5e484e569..d1878bad5 100644
--- a/gstreamer-base/sys/tests/constant.c
+++ b/gstreamer-base/sys/tests/constant.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-base/sys/tests/layout.c b/gstreamer-base/sys/tests/layout.c
index ddffc242f..f83a073d6 100644
--- a/gstreamer-base/sys/tests/layout.c
+++ b/gstreamer-base/sys/tests/layout.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-check/src/auto/test_clock.rs b/gstreamer-check/src/auto/test_clock.rs
index ef33dd388..db5d370fb 100644
--- a/gstreamer-check/src/auto/test_clock.rs
+++ b/gstreamer-check/src/auto/test_clock.rs
@@ -9,6 +9,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -134,7 +135,6 @@ impl TestClock {
             value
                 .get()
                 .expect("Return Value for property `clock-type` getter")
-                .unwrap()
         }
     }
 
@@ -144,7 +144,7 @@ impl TestClock {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"clock-type\0".as_ptr() as *const _,
-                glib::Value::from(&clock_type).to_glib_none().0,
+                clock_type.to_value().to_glib_none().0,
             );
         }
     }
@@ -161,7 +161,6 @@ impl TestClock {
             value
                 .get()
                 .expect("Return Value for property `start-time` getter")
-                .unwrap()
         }
     }
 
diff --git a/gstreamer-check/src/auto/versions.txt b/gstreamer-check/src/auto/versions.txt
index cb68ef35f..a08888cb1 100644
--- a/gstreamer-check/src/auto/versions.txt
+++ b/gstreamer-check/src/auto/versions.txt
@@ -1,3 +1,3 @@
-Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
diff --git a/gstreamer-check/sys/build.rs b/gstreamer-check/sys/build.rs
index 4a1611df2..7831eedbf 100644
--- a/gstreamer-check/sys/build.rs
+++ b/gstreamer-check/sys/build.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-check/sys/src/lib.rs b/gstreamer-check/sys/src/lib.rs
index afe51e2ae..decec1cfd 100644
--- a/gstreamer-check/sys/src/lib.rs
+++ b/gstreamer-check/sys/src/lib.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-check/sys/tests/abi.rs b/gstreamer-check/sys/tests/abi.rs
index 24fbb3803..e53c3d2e0 100644
--- a/gstreamer-check/sys/tests/abi.rs
+++ b/gstreamer-check/sys/tests/abi.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-check/sys/tests/constant.c b/gstreamer-check/sys/tests/constant.c
index c6a623122..b16aaa884 100644
--- a/gstreamer-check/sys/tests/constant.c
+++ b/gstreamer-check/sys/tests/constant.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-check/sys/tests/layout.c b/gstreamer-check/sys/tests/layout.c
index dd1bae222..742f597e4 100644
--- a/gstreamer-check/sys/tests/layout.c
+++ b/gstreamer-check/sys/tests/layout.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-controller/src/auto/argb_control_binding.rs b/gstreamer-controller/src/auto/argb_control_binding.rs
index 5e8103999..aa6c3ba88 100644
--- a/gstreamer-controller/src/auto/argb_control_binding.rs
+++ b/gstreamer-controller/src/auto/argb_control_binding.rs
@@ -9,6 +9,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -123,7 +124,7 @@ impl<O: IsA<ARGBControlBinding>> ARGBControlBindingExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"control-source-a\0".as_ptr() as *const _,
-                glib::Value::from(control_source_a).to_glib_none().0,
+                control_source_a.to_value().to_glib_none().0,
             );
         }
     }
@@ -148,7 +149,7 @@ impl<O: IsA<ARGBControlBinding>> ARGBControlBindingExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"control-source-b\0".as_ptr() as *const _,
-                glib::Value::from(control_source_b).to_glib_none().0,
+                control_source_b.to_value().to_glib_none().0,
             );
         }
     }
@@ -173,7 +174,7 @@ impl<O: IsA<ARGBControlBinding>> ARGBControlBindingExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"control-source-g\0".as_ptr() as *const _,
-                glib::Value::from(control_source_g).to_glib_none().0,
+                control_source_g.to_value().to_glib_none().0,
             );
         }
     }
@@ -198,7 +199,7 @@ impl<O: IsA<ARGBControlBinding>> ARGBControlBindingExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"control-source-r\0".as_ptr() as *const _,
-                glib::Value::from(control_source_r).to_glib_none().0,
+                control_source_r.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-controller/src/auto/direct_control_binding.rs b/gstreamer-controller/src/auto/direct_control_binding.rs
index 51c1d144d..116b6012d 100644
--- a/gstreamer-controller/src/auto/direct_control_binding.rs
+++ b/gstreamer-controller/src/auto/direct_control_binding.rs
@@ -9,6 +9,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -89,7 +90,6 @@ impl<O: IsA<DirectControlBinding>> DirectControlBindingExt for O {
             value
                 .get()
                 .expect("Return Value for property `absolute` getter")
-                .unwrap()
         }
     }
 
@@ -113,7 +113,7 @@ impl<O: IsA<DirectControlBinding>> DirectControlBindingExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"control-source\0".as_ptr() as *const _,
-                glib::Value::from(control_source).to_glib_none().0,
+                control_source.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-controller/src/auto/enums.rs b/gstreamer-controller/src/auto/enums.rs
index 4a5b1c840..d0cc17e2f 100644
--- a/gstreamer-controller/src/auto/enums.rs
+++ b/gstreamer-controller/src/auto/enums.rs
@@ -5,8 +5,7 @@
 
 use glib::translate::*;
 use glib::value::FromValue;
-use glib::value::FromValueOptional;
-use glib::value::SetValue;
+use glib::value::ToValue;
 use glib::StaticType;
 use glib::Type;
 
@@ -61,21 +60,30 @@ impl StaticType for InterpolationMode {
     }
 }
 
-impl<'a> FromValueOptional<'a> for InterpolationMode {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for InterpolationMode {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for InterpolationMode {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for InterpolationMode {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for InterpolationMode {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for InterpolationMode {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<InterpolationMode>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -134,20 +142,29 @@ impl StaticType for LFOWaveform {
     }
 }
 
-impl<'a> FromValueOptional<'a> for LFOWaveform {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for LFOWaveform {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for LFOWaveform {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for LFOWaveform {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for LFOWaveform {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for LFOWaveform {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<LFOWaveform>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
diff --git a/gstreamer-controller/src/auto/interpolation_control_source.rs b/gstreamer-controller/src/auto/interpolation_control_source.rs
index 8055ac8a8..58c4edfca 100644
--- a/gstreamer-controller/src/auto/interpolation_control_source.rs
+++ b/gstreamer-controller/src/auto/interpolation_control_source.rs
@@ -11,6 +11,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -70,7 +71,6 @@ impl<O: IsA<InterpolationControlSource>> InterpolationControlSourceExt for O {
             value
                 .get()
                 .expect("Return Value for property `mode` getter")
-                .unwrap()
         }
     }
 
@@ -79,7 +79,7 @@ impl<O: IsA<InterpolationControlSource>> InterpolationControlSourceExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"mode\0".as_ptr() as *const _,
-                glib::Value::from(&mode).to_glib_none().0,
+                mode.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-controller/src/auto/lfo_control_source.rs b/gstreamer-controller/src/auto/lfo_control_source.rs
index cdf836b86..714f91067 100644
--- a/gstreamer-controller/src/auto/lfo_control_source.rs
+++ b/gstreamer-controller/src/auto/lfo_control_source.rs
@@ -10,6 +10,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -111,7 +112,6 @@ impl<O: IsA<LFOControlSource>> LFOControlSourceExt for O {
             value
                 .get()
                 .expect("Return Value for property `amplitude` getter")
-                .unwrap()
         }
     }
 
@@ -120,7 +120,7 @@ impl<O: IsA<LFOControlSource>> LFOControlSourceExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"amplitude\0".as_ptr() as *const _,
-                glib::Value::from(&amplitude).to_glib_none().0,
+                amplitude.to_value().to_glib_none().0,
             );
         }
     }
@@ -136,7 +136,6 @@ impl<O: IsA<LFOControlSource>> LFOControlSourceExt for O {
             value
                 .get()
                 .expect("Return Value for property `frequency` getter")
-                .unwrap()
         }
     }
 
@@ -145,7 +144,7 @@ impl<O: IsA<LFOControlSource>> LFOControlSourceExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"frequency\0".as_ptr() as *const _,
-                glib::Value::from(&frequency).to_glib_none().0,
+                frequency.to_value().to_glib_none().0,
             );
         }
     }
@@ -161,7 +160,6 @@ impl<O: IsA<LFOControlSource>> LFOControlSourceExt for O {
             value
                 .get()
                 .expect("Return Value for property `offset` getter")
-                .unwrap()
         }
     }
 
@@ -170,7 +168,7 @@ impl<O: IsA<LFOControlSource>> LFOControlSourceExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"offset\0".as_ptr() as *const _,
-                glib::Value::from(&offset).to_glib_none().0,
+                offset.to_value().to_glib_none().0,
             );
         }
     }
@@ -186,7 +184,6 @@ impl<O: IsA<LFOControlSource>> LFOControlSourceExt for O {
             value
                 .get()
                 .expect("Return Value for property `timeshift` getter")
-                .unwrap()
         }
     }
 
@@ -195,7 +192,7 @@ impl<O: IsA<LFOControlSource>> LFOControlSourceExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"timeshift\0".as_ptr() as *const _,
-                glib::Value::from(&timeshift).to_glib_none().0,
+                timeshift.to_value().to_glib_none().0,
             );
         }
     }
@@ -211,7 +208,6 @@ impl<O: IsA<LFOControlSource>> LFOControlSourceExt for O {
             value
                 .get()
                 .expect("Return Value for property `waveform` getter")
-                .unwrap()
         }
     }
 
@@ -220,7 +216,7 @@ impl<O: IsA<LFOControlSource>> LFOControlSourceExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"waveform\0".as_ptr() as *const _,
-                glib::Value::from(&waveform).to_glib_none().0,
+                waveform.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-controller/src/auto/trigger_control_source.rs b/gstreamer-controller/src/auto/trigger_control_source.rs
index cdc28cd77..99ab83988 100644
--- a/gstreamer-controller/src/auto/trigger_control_source.rs
+++ b/gstreamer-controller/src/auto/trigger_control_source.rs
@@ -10,6 +10,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -67,7 +68,6 @@ impl<O: IsA<TriggerControlSource>> TriggerControlSourceExt for O {
             value
                 .get()
                 .expect("Return Value for property `tolerance` getter")
-                .unwrap()
         }
     }
 
@@ -76,7 +76,7 @@ impl<O: IsA<TriggerControlSource>> TriggerControlSourceExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"tolerance\0".as_ptr() as *const _,
-                glib::Value::from(&tolerance).to_glib_none().0,
+                tolerance.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-controller/src/auto/versions.txt b/gstreamer-controller/src/auto/versions.txt
index cb68ef35f..a08888cb1 100644
--- a/gstreamer-controller/src/auto/versions.txt
+++ b/gstreamer-controller/src/auto/versions.txt
@@ -1,3 +1,3 @@
-Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
diff --git a/gstreamer-controller/sys/build.rs b/gstreamer-controller/sys/build.rs
index 4a1611df2..7831eedbf 100644
--- a/gstreamer-controller/sys/build.rs
+++ b/gstreamer-controller/sys/build.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-controller/sys/src/lib.rs b/gstreamer-controller/sys/src/lib.rs
index 8e688b4fd..5d5634f9a 100644
--- a/gstreamer-controller/sys/src/lib.rs
+++ b/gstreamer-controller/sys/src/lib.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-controller/sys/tests/abi.rs b/gstreamer-controller/sys/tests/abi.rs
index 247c6d541..739e6570c 100644
--- a/gstreamer-controller/sys/tests/abi.rs
+++ b/gstreamer-controller/sys/tests/abi.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-controller/sys/tests/constant.c b/gstreamer-controller/sys/tests/constant.c
index 26e98d3a7..5593d3116 100644
--- a/gstreamer-controller/sys/tests/constant.c
+++ b/gstreamer-controller/sys/tests/constant.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-controller/sys/tests/layout.c b/gstreamer-controller/sys/tests/layout.c
index 21c372c52..1e021a291 100644
--- a/gstreamer-controller/sys/tests/layout.c
+++ b/gstreamer-controller/sys/tests/layout.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-editing-services/src/auto/container.rs b/gstreamer-editing-services/src/auto/container.rs
index 269d7d6ac..50a816e43 100644
--- a/gstreamer-editing-services/src/auto/container.rs
+++ b/gstreamer-editing-services/src/auto/container.rs
@@ -14,6 +14,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -152,7 +153,6 @@ impl<O: IsA<Container>> GESContainerExt for O {
             value
                 .get()
                 .expect("Return Value for property `height` getter")
-                .unwrap()
         }
     }
 
diff --git a/gstreamer-editing-services/src/auto/effect.rs b/gstreamer-editing-services/src/auto/effect.rs
index 5b44a2a8f..b508811d0 100644
--- a/gstreamer-editing-services/src/auto/effect.rs
+++ b/gstreamer-editing-services/src/auto/effect.rs
@@ -10,6 +10,7 @@ use crate::TrackElement;
 use glib::object::IsA;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 
 glib::wrapper! {
     pub struct Effect(Object<ffi::GESEffect, ffi::GESEffectClass>) @extends BaseEffect, TrackElement, TimelineElement, @implements Extractable;
diff --git a/gstreamer-editing-services/src/auto/enums.rs b/gstreamer-editing-services/src/auto/enums.rs
index 969f5fbd7..909fb33d1 100644
--- a/gstreamer-editing-services/src/auto/enums.rs
+++ b/gstreamer-editing-services/src/auto/enums.rs
@@ -5,8 +5,7 @@
 
 use glib::translate::*;
 use glib::value::FromValue;
-use glib::value::FromValueOptional;
-use glib::value::SetValue;
+use glib::value::ToValue;
 use glib::StaticType;
 use glib::Type;
 #[cfg(any(feature = "v1_16", feature = "dox"))]
@@ -88,21 +87,30 @@ impl StaticType for Edge {
     }
 }
 
-impl<'a> FromValueOptional<'a> for Edge {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for Edge {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for Edge {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for Edge {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for Edge {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for Edge {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<Edge>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -186,21 +194,30 @@ impl StaticType for EditMode {
     }
 }
 
-impl<'a> FromValueOptional<'a> for EditMode {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for EditMode {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for EditMode {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for EditMode {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for EditMode {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for EditMode {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<EditMode>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -649,20 +666,29 @@ impl StaticType for VideoStandardTransitionType {
     }
 }
 
-impl<'a> FromValueOptional<'a> for VideoStandardTransitionType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoStandardTransitionType {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for VideoStandardTransitionType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoStandardTransitionType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for VideoStandardTransitionType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoStandardTransitionType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoStandardTransitionType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
diff --git a/gstreamer-editing-services/src/auto/flags.rs b/gstreamer-editing-services/src/auto/flags.rs
index 4c1bc6e36..134a944ff 100644
--- a/gstreamer-editing-services/src/auto/flags.rs
+++ b/gstreamer-editing-services/src/auto/flags.rs
@@ -6,8 +6,7 @@
 use bitflags::bitflags;
 use glib::translate::*;
 use glib::value::FromValue;
-use glib::value::FromValueOptional;
-use glib::value::SetValue;
+use glib::value::ToValue;
 use glib::StaticType;
 use glib::Type;
 use std::ffi::CStr;
@@ -46,21 +45,30 @@ impl StaticType for PipelineFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for PipelineFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for PipelineFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for PipelineFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for PipelineFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for PipelineFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for PipelineFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<PipelineFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -118,20 +126,29 @@ impl StaticType for TrackType {
     }
 }
 
-impl<'a> FromValueOptional<'a> for TrackType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for TrackType {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for TrackType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for TrackType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for TrackType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for TrackType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<TrackType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
diff --git a/gstreamer-editing-services/src/auto/group.rs b/gstreamer-editing-services/src/auto/group.rs
index 31b6fbbfd..4c7539c98 100644
--- a/gstreamer-editing-services/src/auto/group.rs
+++ b/gstreamer-editing-services/src/auto/group.rs
@@ -12,6 +12,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -94,7 +95,6 @@ impl<O: IsA<Group>> GroupExt for O {
             value
                 .get()
                 .expect("Return Value for property `duration` getter")
-                .unwrap()
         }
     }
 
@@ -103,7 +103,7 @@ impl<O: IsA<Group>> GroupExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"duration\0".as_ptr() as *const _,
-                glib::Value::from(&duration).to_glib_none().0,
+                duration.to_value().to_glib_none().0,
             );
         }
     }
@@ -119,7 +119,6 @@ impl<O: IsA<Group>> GroupExt for O {
             value
                 .get()
                 .expect("Return Value for property `in-point` getter")
-                .unwrap()
         }
     }
 
@@ -128,7 +127,7 @@ impl<O: IsA<Group>> GroupExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"in-point\0".as_ptr() as *const _,
-                glib::Value::from(&in_point).to_glib_none().0,
+                in_point.to_value().to_glib_none().0,
             );
         }
     }
@@ -144,7 +143,6 @@ impl<O: IsA<Group>> GroupExt for O {
             value
                 .get()
                 .expect("Return Value for property `max-duration` getter")
-                .unwrap()
         }
     }
 
@@ -153,7 +151,7 @@ impl<O: IsA<Group>> GroupExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"max-duration\0".as_ptr() as *const _,
-                glib::Value::from(&max_duration).to_glib_none().0,
+                max_duration.to_value().to_glib_none().0,
             );
         }
     }
@@ -169,7 +167,6 @@ impl<O: IsA<Group>> GroupExt for O {
             value
                 .get()
                 .expect("Return Value for property `priority` getter")
-                .unwrap()
         }
     }
 
@@ -178,7 +175,7 @@ impl<O: IsA<Group>> GroupExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"priority\0".as_ptr() as *const _,
-                glib::Value::from(&priority).to_glib_none().0,
+                priority.to_value().to_glib_none().0,
             );
         }
     }
@@ -194,7 +191,6 @@ impl<O: IsA<Group>> GroupExt for O {
             value
                 .get()
                 .expect("Return Value for property `start` getter")
-                .unwrap()
         }
     }
 
@@ -203,7 +199,7 @@ impl<O: IsA<Group>> GroupExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"start\0".as_ptr() as *const _,
-                glib::Value::from(&start).to_glib_none().0,
+                start.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-editing-services/src/auto/pipeline.rs b/gstreamer-editing-services/src/auto/pipeline.rs
index 5ac20a215..acc5b8ead 100644
--- a/gstreamer-editing-services/src/auto/pipeline.rs
+++ b/gstreamer-editing-services/src/auto/pipeline.rs
@@ -11,6 +11,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 use std::ptr;
@@ -265,7 +266,7 @@ impl<O: IsA<Pipeline>> GESPipelineExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"audio-filter\0".as_ptr() as *const _,
-                glib::Value::from(audio_filter).to_glib_none().0,
+                audio_filter.to_value().to_glib_none().0,
             );
         }
     }
@@ -289,7 +290,7 @@ impl<O: IsA<Pipeline>> GESPipelineExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"audio-sink\0".as_ptr() as *const _,
-                glib::Value::from(audio_sink).to_glib_none().0,
+                audio_sink.to_value().to_glib_none().0,
             );
         }
     }
@@ -327,7 +328,7 @@ impl<O: IsA<Pipeline>> GESPipelineExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"video-filter\0".as_ptr() as *const _,
-                glib::Value::from(video_filter).to_glib_none().0,
+                video_filter.to_value().to_glib_none().0,
             );
         }
     }
@@ -351,7 +352,7 @@ impl<O: IsA<Pipeline>> GESPipelineExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"video-sink\0".as_ptr() as *const _,
-                glib::Value::from(video_sink).to_glib_none().0,
+                video_sink.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-editing-services/src/auto/timeline_element.rs b/gstreamer-editing-services/src/auto/timeline_element.rs
index 74bf03362..86976c28d 100644
--- a/gstreamer-editing-services/src/auto/timeline_element.rs
+++ b/gstreamer-editing-services/src/auto/timeline_element.rs
@@ -21,6 +21,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 #[cfg(any(feature = "v1_18", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_18")))]
@@ -605,7 +606,6 @@ impl<O: IsA<TimelineElement>> TimelineElementExt for O {
             value
                 .get()
                 .expect("Return Value for property `in-point` getter")
-                .unwrap()
         }
     }
 
@@ -614,7 +614,7 @@ impl<O: IsA<TimelineElement>> TimelineElementExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"in-point\0".as_ptr() as *const _,
-                glib::Value::from(&in_point).to_glib_none().0,
+                in_point.to_value().to_glib_none().0,
             );
         }
     }
@@ -630,7 +630,6 @@ impl<O: IsA<TimelineElement>> TimelineElementExt for O {
             value
                 .get()
                 .expect("Return Value for property `serialize` getter")
-                .unwrap()
         }
     }
 
@@ -639,7 +638,7 @@ impl<O: IsA<TimelineElement>> TimelineElementExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"serialize\0".as_ptr() as *const _,
-                glib::Value::from(&serialize).to_glib_none().0,
+                serialize.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-editing-services/src/auto/track.rs b/gstreamer-editing-services/src/auto/track.rs
index 89a43eba6..91131288a 100644
--- a/gstreamer-editing-services/src/auto/track.rs
+++ b/gstreamer-editing-services/src/auto/track.rs
@@ -12,6 +12,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 #[cfg(any(feature = "v1_18", feature = "dox"))]
@@ -281,7 +282,6 @@ impl<O: IsA<Track>> GESTrackExt for O {
             value
                 .get()
                 .expect("Return Value for property `duration` getter")
-                .unwrap()
         }
     }
 
@@ -306,7 +306,7 @@ impl<O: IsA<Track>> GESTrackExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"id\0".as_ptr() as *const _,
-                glib::Value::from(id).to_glib_none().0,
+                id.to_value().to_glib_none().0,
             );
         }
     }
@@ -336,7 +336,6 @@ impl<O: IsA<Track>> GESTrackExt for O {
             value
                 .get()
                 .expect("Return Value for property `track-type` getter")
-                .unwrap()
         }
     }
 
diff --git a/gstreamer-editing-services/src/auto/transition_clip.rs b/gstreamer-editing-services/src/auto/transition_clip.rs
index 644fd0828..6f7118662 100644
--- a/gstreamer-editing-services/src/auto/transition_clip.rs
+++ b/gstreamer-editing-services/src/auto/transition_clip.rs
@@ -16,6 +16,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -66,7 +67,6 @@ impl<O: IsA<TransitionClip>> TransitionClipExt for O {
             value
                 .get()
                 .expect("Return Value for property `vtype` getter")
-                .unwrap()
         }
     }
 
@@ -75,7 +75,7 @@ impl<O: IsA<TransitionClip>> TransitionClipExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"vtype\0".as_ptr() as *const _,
-                glib::Value::from(&vtype).to_glib_none().0,
+                vtype.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-editing-services/src/auto/uri_clip_asset.rs b/gstreamer-editing-services/src/auto/uri_clip_asset.rs
index cfc6c6246..ae65df0ce 100644
--- a/gstreamer-editing-services/src/auto/uri_clip_asset.rs
+++ b/gstreamer-editing-services/src/auto/uri_clip_asset.rs
@@ -13,6 +13,7 @@ use glib::translate::*;
 #[cfg(any(feature = "v1_18", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_18")))]
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 use std::ptr;
@@ -143,7 +144,7 @@ impl<O: IsA<UriClipAsset>> UriClipAssetExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"duration\0".as_ptr() as *const _,
-                glib::Value::from(&duration).to_glib_none().0,
+                duration.to_value().to_glib_none().0,
             );
         }
     }
@@ -161,7 +162,6 @@ impl<O: IsA<UriClipAsset>> UriClipAssetExt for O {
             value
                 .get()
                 .expect("Return Value for property `is-nested-timeline` getter")
-                .unwrap()
         }
     }
 
diff --git a/gstreamer-editing-services/src/auto/versions.txt b/gstreamer-editing-services/src/auto/versions.txt
index cb68ef35f..a08888cb1 100644
--- a/gstreamer-editing-services/src/auto/versions.txt
+++ b/gstreamer-editing-services/src/auto/versions.txt
@@ -1,3 +1,3 @@
-Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
diff --git a/gstreamer-editing-services/sys/build.rs b/gstreamer-editing-services/sys/build.rs
index 4a1611df2..7831eedbf 100644
--- a/gstreamer-editing-services/sys/build.rs
+++ b/gstreamer-editing-services/sys/build.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-editing-services/sys/src/lib.rs b/gstreamer-editing-services/sys/src/lib.rs
index 78cb7b27b..4f2b9a9cc 100644
--- a/gstreamer-editing-services/sys/src/lib.rs
+++ b/gstreamer-editing-services/sys/src/lib.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-editing-services/sys/tests/abi.rs b/gstreamer-editing-services/sys/tests/abi.rs
index 0f03ff9a3..805592e07 100644
--- a/gstreamer-editing-services/sys/tests/abi.rs
+++ b/gstreamer-editing-services/sys/tests/abi.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-editing-services/sys/tests/constant.c b/gstreamer-editing-services/sys/tests/constant.c
index 435713eae..d91abe499 100644
--- a/gstreamer-editing-services/sys/tests/constant.c
+++ b/gstreamer-editing-services/sys/tests/constant.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-editing-services/sys/tests/layout.c b/gstreamer-editing-services/sys/tests/layout.c
index 6ee879621..74b080f98 100644
--- a/gstreamer-editing-services/sys/tests/layout.c
+++ b/gstreamer-editing-services/sys/tests/layout.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-gl/egl/src/auto/versions.txt b/gstreamer-gl/egl/src/auto/versions.txt
index cb68ef35f..a08888cb1 100644
--- a/gstreamer-gl/egl/src/auto/versions.txt
+++ b/gstreamer-gl/egl/src/auto/versions.txt
@@ -1,3 +1,3 @@
-Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
diff --git a/gstreamer-gl/egl/sys/build.rs b/gstreamer-gl/egl/sys/build.rs
index 4a1611df2..7831eedbf 100644
--- a/gstreamer-gl/egl/sys/build.rs
+++ b/gstreamer-gl/egl/sys/build.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-gl/egl/sys/src/lib.rs b/gstreamer-gl/egl/sys/src/lib.rs
index 2e52be0d6..c65377516 100644
--- a/gstreamer-gl/egl/sys/src/lib.rs
+++ b/gstreamer-gl/egl/sys/src/lib.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-gl/egl/sys/tests/abi.rs b/gstreamer-gl/egl/sys/tests/abi.rs
index e0d5c1b8f..caa49336c 100644
--- a/gstreamer-gl/egl/sys/tests/abi.rs
+++ b/gstreamer-gl/egl/sys/tests/abi.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-gl/egl/sys/tests/constant.c b/gstreamer-gl/egl/sys/tests/constant.c
index 82b69b3b6..1316da381 100644
--- a/gstreamer-gl/egl/sys/tests/constant.c
+++ b/gstreamer-gl/egl/sys/tests/constant.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-gl/egl/sys/tests/layout.c b/gstreamer-gl/egl/sys/tests/layout.c
index 2fdc42137..5c146018b 100644
--- a/gstreamer-gl/egl/sys/tests/layout.c
+++ b/gstreamer-gl/egl/sys/tests/layout.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-gl/src/auto/enums.rs b/gstreamer-gl/src/auto/enums.rs
index 0758f54f1..7481c9741 100644
--- a/gstreamer-gl/src/auto/enums.rs
+++ b/gstreamer-gl/src/auto/enums.rs
@@ -9,8 +9,7 @@ use glib::error::ErrorDomain;
 use glib::object::IsA;
 use glib::translate::*;
 use glib::value::FromValue;
-use glib::value::FromValueOptional;
-use glib::value::SetValue;
+use glib::value::ToValue;
 use glib::Quark;
 use glib::StaticType;
 use glib::Type;
@@ -100,21 +99,30 @@ impl StaticType for GLContextError {
     }
 }
 
-impl<'a> FromValueOptional<'a> for GLContextError {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for GLContextError {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for GLContextError {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for GLContextError {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for GLContextError {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for GLContextError {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<GLContextError>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -285,21 +293,30 @@ impl StaticType for GLFormat {
     }
 }
 
-impl<'a> FromValueOptional<'a> for GLFormat {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for GLFormat {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for GLFormat {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for GLFormat {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for GLFormat {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for GLFormat {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<GLFormat>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -350,21 +367,30 @@ impl StaticType for GLQueryType {
     }
 }
 
-impl<'a> FromValueOptional<'a> for GLQueryType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for GLQueryType {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for GLQueryType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for GLQueryType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for GLQueryType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for GLQueryType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<GLQueryType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -437,21 +463,30 @@ impl StaticType for GLSLError {
     }
 }
 
-impl<'a> FromValueOptional<'a> for GLSLError {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for GLSLError {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for GLSLError {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for GLSLError {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for GLSLError {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for GLSLError {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<GLSLError>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -604,21 +639,30 @@ impl StaticType for GLSLVersion {
     }
 }
 
-impl<'a> FromValueOptional<'a> for GLSLVersion {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for GLSLVersion {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for GLSLVersion {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for GLSLVersion {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for GLSLVersion {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for GLSLVersion {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<GLSLVersion>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -673,21 +717,30 @@ impl StaticType for GLStereoDownmix {
     }
 }
 
-impl<'a> FromValueOptional<'a> for GLStereoDownmix {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for GLStereoDownmix {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for GLStereoDownmix {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for GLStereoDownmix {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for GLStereoDownmix {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for GLStereoDownmix {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<GLStereoDownmix>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -778,21 +831,30 @@ impl StaticType for GLTextureTarget {
     }
 }
 
-impl<'a> FromValueOptional<'a> for GLTextureTarget {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for GLTextureTarget {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for GLTextureTarget {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for GLTextureTarget {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for GLTextureTarget {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for GLTextureTarget {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<GLTextureTarget>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -851,21 +913,30 @@ impl StaticType for GLUploadReturn {
     }
 }
 
-impl<'a> FromValueOptional<'a> for GLUploadReturn {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for GLUploadReturn {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for GLUploadReturn {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for GLUploadReturn {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for GLUploadReturn {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for GLUploadReturn {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<GLUploadReturn>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -938,20 +1009,29 @@ impl StaticType for GLWindowError {
     }
 }
 
-impl<'a> FromValueOptional<'a> for GLWindowError {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for GLWindowError {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for GLWindowError {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for GLWindowError {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for GLWindowError {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for GLWindowError {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<GLWindowError>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
diff --git a/gstreamer-gl/src/auto/flags.rs b/gstreamer-gl/src/auto/flags.rs
index c81165c53..474dcedd8 100644
--- a/gstreamer-gl/src/auto/flags.rs
+++ b/gstreamer-gl/src/auto/flags.rs
@@ -6,8 +6,7 @@
 use bitflags::bitflags;
 use glib::translate::*;
 use glib::value::FromValue;
-use glib::value::FromValueOptional;
-use glib::value::SetValue;
+use glib::value::ToValue;
 use glib::StaticType;
 use glib::Type;
 use std::fmt;
@@ -65,21 +64,30 @@ impl StaticType for GLAPI {
     }
 }
 
-impl<'a> FromValueOptional<'a> for GLAPI {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for GLAPI {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for GLAPI {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for GLAPI {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for GLAPI {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for GLAPI {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<GLAPI>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -122,21 +130,30 @@ impl StaticType for GLDisplayType {
     }
 }
 
-impl<'a> FromValueOptional<'a> for GLDisplayType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for GLDisplayType {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for GLDisplayType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for GLDisplayType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for GLDisplayType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for GLDisplayType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<GLDisplayType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -198,21 +215,30 @@ impl StaticType for GLPlatform {
     }
 }
 
-impl<'a> FromValueOptional<'a> for GLPlatform {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for GLPlatform {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for GLPlatform {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for GLPlatform {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for GLPlatform {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for GLPlatform {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<GLPlatform>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -261,20 +287,29 @@ impl StaticType for GLSLProfile {
     }
 }
 
-impl<'a> FromValueOptional<'a> for GLSLProfile {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for GLSLProfile {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for GLSLProfile {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for GLSLProfile {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for GLSLProfile {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for GLSLProfile {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<GLSLProfile>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
diff --git a/gstreamer-gl/src/auto/gl_base_filter.rs b/gstreamer-gl/src/auto/gl_base_filter.rs
index f65ceba3c..4f42a7da1 100644
--- a/gstreamer-gl/src/auto/gl_base_filter.rs
+++ b/gstreamer-gl/src/auto/gl_base_filter.rs
@@ -10,6 +10,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
diff --git a/gstreamer-gl/src/auto/gl_overlay_compositor.rs b/gstreamer-gl/src/auto/gl_overlay_compositor.rs
index 20df98d17..05c331631 100644
--- a/gstreamer-gl/src/auto/gl_overlay_compositor.rs
+++ b/gstreamer-gl/src/auto/gl_overlay_compositor.rs
@@ -20,6 +20,9 @@ use glib::translate::*;
 use glib::StaticType;
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
+use glib::ToValue;
+#[cfg(any(feature = "v1_16", feature = "dox"))]
+#[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
 use std::boxed::Box as Box_;
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
@@ -72,7 +75,6 @@ impl GLOverlayCompositor {
             value
                 .get()
                 .expect("Return Value for property `yinvert` getter")
-                .unwrap()
         }
     }
 
@@ -84,7 +86,7 @@ impl GLOverlayCompositor {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"yinvert\0".as_ptr() as *const _,
-                glib::Value::from(&yinvert).to_glib_none().0,
+                yinvert.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-gl/src/auto/gl_view_convert.rs b/gstreamer-gl/src/auto/gl_view_convert.rs
index df747e2ec..3a6cc8dcf 100644
--- a/gstreamer-gl/src/auto/gl_view_convert.rs
+++ b/gstreamer-gl/src/auto/gl_view_convert.rs
@@ -11,6 +11,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -103,7 +104,6 @@ impl GLViewConvert {
             value
                 .get()
                 .expect("Return Value for property `downmix-mode` getter")
-                .unwrap()
         }
     }
 
@@ -113,7 +113,7 @@ impl GLViewConvert {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"downmix-mode\0".as_ptr() as *const _,
-                glib::Value::from(&downmix_mode).to_glib_none().0,
+                downmix_mode.to_value().to_glib_none().0,
             );
         }
     }
@@ -132,7 +132,6 @@ impl GLViewConvert {
             value
                 .get()
                 .expect("Return Value for property `input-flags-override` getter")
-                .unwrap()
         }
     }
 
@@ -142,7 +141,7 @@ impl GLViewConvert {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"input-flags-override\0".as_ptr() as *const _,
-                glib::Value::from(&input_flags_override).to_glib_none().0,
+                input_flags_override.to_value().to_glib_none().0,
             );
         }
     }
@@ -161,7 +160,6 @@ impl GLViewConvert {
             value
                 .get()
                 .expect("Return Value for property `input-mode-override` getter")
-                .unwrap()
         }
     }
 
@@ -171,7 +169,7 @@ impl GLViewConvert {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"input-mode-override\0".as_ptr() as *const _,
-                glib::Value::from(&input_mode_override).to_glib_none().0,
+                input_mode_override.to_value().to_glib_none().0,
             );
         }
     }
@@ -190,7 +188,6 @@ impl GLViewConvert {
             value
                 .get()
                 .expect("Return Value for property `output-flags-override` getter")
-                .unwrap()
         }
     }
 
@@ -200,7 +197,7 @@ impl GLViewConvert {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"output-flags-override\0".as_ptr() as *const _,
-                glib::Value::from(&output_flags_override).to_glib_none().0,
+                output_flags_override.to_value().to_glib_none().0,
             );
         }
     }
@@ -219,7 +216,6 @@ impl GLViewConvert {
             value
                 .get()
                 .expect("Return Value for property `output-mode-override` getter")
-                .unwrap()
         }
     }
 
@@ -229,7 +225,7 @@ impl GLViewConvert {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"output-mode-override\0".as_ptr() as *const _,
-                glib::Value::from(&output_mode_override).to_glib_none().0,
+                output_mode_override.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-gl/src/auto/versions.txt b/gstreamer-gl/src/auto/versions.txt
index cb68ef35f..a08888cb1 100644
--- a/gstreamer-gl/src/auto/versions.txt
+++ b/gstreamer-gl/src/auto/versions.txt
@@ -1,3 +1,3 @@
-Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
diff --git a/gstreamer-gl/sys/build.rs b/gstreamer-gl/sys/build.rs
index 4a1611df2..7831eedbf 100644
--- a/gstreamer-gl/sys/build.rs
+++ b/gstreamer-gl/sys/build.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-gl/sys/src/lib.rs b/gstreamer-gl/sys/src/lib.rs
index 2602453c0..b6ca5642a 100644
--- a/gstreamer-gl/sys/src/lib.rs
+++ b/gstreamer-gl/sys/src/lib.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-gl/sys/tests/abi.rs b/gstreamer-gl/sys/tests/abi.rs
index 6ccd33c0b..9cb16b164 100644
--- a/gstreamer-gl/sys/tests/abi.rs
+++ b/gstreamer-gl/sys/tests/abi.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-gl/sys/tests/constant.c b/gstreamer-gl/sys/tests/constant.c
index b9b8c385d..4cf5fca06 100644
--- a/gstreamer-gl/sys/tests/constant.c
+++ b/gstreamer-gl/sys/tests/constant.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-gl/sys/tests/layout.c b/gstreamer-gl/sys/tests/layout.c
index b6c65f8bd..0b918a6c5 100644
--- a/gstreamer-gl/sys/tests/layout.c
+++ b/gstreamer-gl/sys/tests/layout.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-gl/wayland/src/auto/versions.txt b/gstreamer-gl/wayland/src/auto/versions.txt
index cb68ef35f..a08888cb1 100644
--- a/gstreamer-gl/wayland/src/auto/versions.txt
+++ b/gstreamer-gl/wayland/src/auto/versions.txt
@@ -1,3 +1,3 @@
-Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
diff --git a/gstreamer-gl/wayland/sys/build.rs b/gstreamer-gl/wayland/sys/build.rs
index 4a1611df2..7831eedbf 100644
--- a/gstreamer-gl/wayland/sys/build.rs
+++ b/gstreamer-gl/wayland/sys/build.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-gl/wayland/sys/src/lib.rs b/gstreamer-gl/wayland/sys/src/lib.rs
index b1f70048c..994fdc92a 100644
--- a/gstreamer-gl/wayland/sys/src/lib.rs
+++ b/gstreamer-gl/wayland/sys/src/lib.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-gl/wayland/sys/tests/abi.rs b/gstreamer-gl/wayland/sys/tests/abi.rs
index 3e0a1e328..e9d710747 100644
--- a/gstreamer-gl/wayland/sys/tests/abi.rs
+++ b/gstreamer-gl/wayland/sys/tests/abi.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-gl/wayland/sys/tests/constant.c b/gstreamer-gl/wayland/sys/tests/constant.c
index c6a623122..b16aaa884 100644
--- a/gstreamer-gl/wayland/sys/tests/constant.c
+++ b/gstreamer-gl/wayland/sys/tests/constant.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-gl/wayland/sys/tests/layout.c b/gstreamer-gl/wayland/sys/tests/layout.c
index cb8a751c1..b9d6a67e8 100644
--- a/gstreamer-gl/wayland/sys/tests/layout.c
+++ b/gstreamer-gl/wayland/sys/tests/layout.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-gl/x11/src/auto/versions.txt b/gstreamer-gl/x11/src/auto/versions.txt
index cb68ef35f..a08888cb1 100644
--- a/gstreamer-gl/x11/src/auto/versions.txt
+++ b/gstreamer-gl/x11/src/auto/versions.txt
@@ -1,3 +1,3 @@
-Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
diff --git a/gstreamer-gl/x11/sys/build.rs b/gstreamer-gl/x11/sys/build.rs
index 4a1611df2..7831eedbf 100644
--- a/gstreamer-gl/x11/sys/build.rs
+++ b/gstreamer-gl/x11/sys/build.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-gl/x11/sys/src/lib.rs b/gstreamer-gl/x11/sys/src/lib.rs
index 4d16e88e9..c5efaf57c 100644
--- a/gstreamer-gl/x11/sys/src/lib.rs
+++ b/gstreamer-gl/x11/sys/src/lib.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-gl/x11/sys/tests/abi.rs b/gstreamer-gl/x11/sys/tests/abi.rs
index e51c96f86..53c3a7b2b 100644
--- a/gstreamer-gl/x11/sys/tests/abi.rs
+++ b/gstreamer-gl/x11/sys/tests/abi.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-gl/x11/sys/tests/constant.c b/gstreamer-gl/x11/sys/tests/constant.c
index c6a623122..b16aaa884 100644
--- a/gstreamer-gl/x11/sys/tests/constant.c
+++ b/gstreamer-gl/x11/sys/tests/constant.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-gl/x11/sys/tests/layout.c b/gstreamer-gl/x11/sys/tests/layout.c
index edc69fc6c..55188a010 100644
--- a/gstreamer-gl/x11/sys/tests/layout.c
+++ b/gstreamer-gl/x11/sys/tests/layout.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-mpegts/sys/build.rs b/gstreamer-mpegts/sys/build.rs
index 4a1611df2..7831eedbf 100644
--- a/gstreamer-mpegts/sys/build.rs
+++ b/gstreamer-mpegts/sys/build.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-mpegts/sys/src/lib.rs b/gstreamer-mpegts/sys/src/lib.rs
index 993d8a444..09491ab99 100644
--- a/gstreamer-mpegts/sys/src/lib.rs
+++ b/gstreamer-mpegts/sys/src/lib.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-mpegts/sys/tests/abi.rs b/gstreamer-mpegts/sys/tests/abi.rs
index 1aff65f3d..30e945ba6 100644
--- a/gstreamer-mpegts/sys/tests/abi.rs
+++ b/gstreamer-mpegts/sys/tests/abi.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-mpegts/sys/tests/constant.c b/gstreamer-mpegts/sys/tests/constant.c
index e77a0e7c7..c574f9ca6 100644
--- a/gstreamer-mpegts/sys/tests/constant.c
+++ b/gstreamer-mpegts/sys/tests/constant.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-mpegts/sys/tests/layout.c b/gstreamer-mpegts/sys/tests/layout.c
index e2d36610b..f3a563e90 100644
--- a/gstreamer-mpegts/sys/tests/layout.c
+++ b/gstreamer-mpegts/sys/tests/layout.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-net/src/auto/net_client_clock.rs b/gstreamer-net/src/auto/net_client_clock.rs
index 3c8c500db..eaa742b99 100644
--- a/gstreamer-net/src/auto/net_client_clock.rs
+++ b/gstreamer-net/src/auto/net_client_clock.rs
@@ -9,6 +9,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -42,7 +43,7 @@ impl NetClientClock {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"address\0".as_ptr() as *const _,
-                glib::Value::from(address).to_glib_none().0,
+                address.to_value().to_glib_none().0,
             );
         }
     }
@@ -59,7 +60,6 @@ impl NetClientClock {
             value
                 .get()
                 .expect("Return Value for property `base-time` getter")
-                .unwrap()
         }
     }
 
@@ -82,7 +82,7 @@ impl NetClientClock {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"bus\0".as_ptr() as *const _,
-                glib::Value::from(bus).to_glib_none().0,
+                bus.to_value().to_glib_none().0,
             );
         }
     }
@@ -114,7 +114,6 @@ impl NetClientClock {
             value
                 .get()
                 .expect("Return Value for property `minimum-update-interval` getter")
-                .unwrap()
         }
     }
 
@@ -124,7 +123,7 @@ impl NetClientClock {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"minimum-update-interval\0".as_ptr() as *const _,
-                glib::Value::from(&minimum_update_interval).to_glib_none().0,
+                minimum_update_interval.to_value().to_glib_none().0,
             );
         }
     }
@@ -141,7 +140,6 @@ impl NetClientClock {
             value
                 .get()
                 .expect("Return Value for property `port` getter")
-                .unwrap()
         }
     }
 
@@ -151,7 +149,7 @@ impl NetClientClock {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"port\0".as_ptr() as *const _,
-                glib::Value::from(&port).to_glib_none().0,
+                port.to_value().to_glib_none().0,
             );
         }
     }
@@ -168,7 +166,6 @@ impl NetClientClock {
             value
                 .get()
                 .expect("Return Value for property `qos-dscp` getter")
-                .unwrap()
         }
     }
 
@@ -178,7 +175,7 @@ impl NetClientClock {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"qos-dscp\0".as_ptr() as *const _,
-                glib::Value::from(&qos_dscp).to_glib_none().0,
+                qos_dscp.to_value().to_glib_none().0,
             );
         }
     }
@@ -195,7 +192,6 @@ impl NetClientClock {
             value
                 .get()
                 .expect("Return Value for property `round-trip-limit` getter")
-                .unwrap()
         }
     }
 
@@ -205,7 +201,7 @@ impl NetClientClock {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"round-trip-limit\0".as_ptr() as *const _,
-                glib::Value::from(&round_trip_limit).to_glib_none().0,
+                round_trip_limit.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-net/src/auto/net_time_provider.rs b/gstreamer-net/src/auto/net_time_provider.rs
index 240137ffc..576f991c4 100644
--- a/gstreamer-net/src/auto/net_time_provider.rs
+++ b/gstreamer-net/src/auto/net_time_provider.rs
@@ -8,6 +8,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -32,7 +33,6 @@ impl NetTimeProvider {
             value
                 .get()
                 .expect("Return Value for property `active` getter")
-                .unwrap()
         }
     }
 
@@ -42,7 +42,7 @@ impl NetTimeProvider {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"active\0".as_ptr() as *const _,
-                glib::Value::from(&active).to_glib_none().0,
+                active.to_value().to_glib_none().0,
             );
         }
     }
@@ -89,7 +89,6 @@ impl NetTimeProvider {
             value
                 .get()
                 .expect("Return Value for property `port` getter")
-                .unwrap()
         }
     }
 
@@ -105,7 +104,6 @@ impl NetTimeProvider {
             value
                 .get()
                 .expect("Return Value for property `qos-dscp` getter")
-                .unwrap()
         }
     }
 
@@ -115,7 +113,7 @@ impl NetTimeProvider {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"qos-dscp\0".as_ptr() as *const _,
-                glib::Value::from(&qos_dscp).to_glib_none().0,
+                qos_dscp.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-net/src/auto/ptp_clock.rs b/gstreamer-net/src/auto/ptp_clock.rs
index 0638f6bc3..b39de9509 100644
--- a/gstreamer-net/src/auto/ptp_clock.rs
+++ b/gstreamer-net/src/auto/ptp_clock.rs
@@ -8,6 +8,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -32,7 +33,6 @@ impl PtpClock {
             value
                 .get()
                 .expect("Return Value for property `domain` getter")
-                .unwrap()
         }
     }
 
@@ -48,7 +48,6 @@ impl PtpClock {
             value
                 .get()
                 .expect("Return Value for property `grandmaster-clock-id` getter")
-                .unwrap()
         }
     }
 
@@ -79,7 +78,6 @@ impl PtpClock {
             value
                 .get()
                 .expect("Return Value for property `master-clock-id` getter")
-                .unwrap()
         }
     }
 
diff --git a/gstreamer-net/src/auto/versions.txt b/gstreamer-net/src/auto/versions.txt
index cb68ef35f..a08888cb1 100644
--- a/gstreamer-net/src/auto/versions.txt
+++ b/gstreamer-net/src/auto/versions.txt
@@ -1,3 +1,3 @@
-Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
diff --git a/gstreamer-net/sys/build.rs b/gstreamer-net/sys/build.rs
index 4a1611df2..7831eedbf 100644
--- a/gstreamer-net/sys/build.rs
+++ b/gstreamer-net/sys/build.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-net/sys/src/lib.rs b/gstreamer-net/sys/src/lib.rs
index b4e816628..7621f6eb3 100644
--- a/gstreamer-net/sys/src/lib.rs
+++ b/gstreamer-net/sys/src/lib.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-net/sys/tests/abi.rs b/gstreamer-net/sys/tests/abi.rs
index 776056a31..0d8124f42 100644
--- a/gstreamer-net/sys/tests/abi.rs
+++ b/gstreamer-net/sys/tests/abi.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-net/sys/tests/constant.c b/gstreamer-net/sys/tests/constant.c
index ab02e6148..51d52bba2 100644
--- a/gstreamer-net/sys/tests/constant.c
+++ b/gstreamer-net/sys/tests/constant.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-net/sys/tests/layout.c b/gstreamer-net/sys/tests/layout.c
index 9964020bf..ff0f4f626 100644
--- a/gstreamer-net/sys/tests/layout.c
+++ b/gstreamer-net/sys/tests/layout.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-pbutils/src/auto/discoverer.rs b/gstreamer-pbutils/src/auto/discoverer.rs
index f811e4f82..a2edd6495 100644
--- a/gstreamer-pbutils/src/auto/discoverer.rs
+++ b/gstreamer-pbutils/src/auto/discoverer.rs
@@ -11,6 +11,9 @@ use glib::translate::*;
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
 use glib::StaticType;
+#[cfg(any(feature = "v1_16", feature = "dox"))]
+#[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 use std::ptr;
@@ -93,7 +96,6 @@ impl Discoverer {
             value
                 .get()
                 .expect("Return Value for property `use-cache` getter")
-                .unwrap()
         }
     }
 
@@ -105,7 +107,7 @@ impl Discoverer {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"use-cache\0".as_ptr() as *const _,
-                glib::Value::from(&use_cache).to_glib_none().0,
+                use_cache.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-pbutils/src/auto/enums.rs b/gstreamer-pbutils/src/auto/enums.rs
index 16bf4823c..af28e1bc8 100644
--- a/gstreamer-pbutils/src/auto/enums.rs
+++ b/gstreamer-pbutils/src/auto/enums.rs
@@ -5,8 +5,7 @@
 
 use glib::translate::*;
 use glib::value::FromValue;
-use glib::value::FromValueOptional;
-use glib::value::SetValue;
+use glib::value::ToValue;
 use glib::StaticType;
 use glib::Type;
 
@@ -69,20 +68,29 @@ impl StaticType for DiscovererResult {
     }
 }
 
-impl<'a> FromValueOptional<'a> for DiscovererResult {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for DiscovererResult {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for DiscovererResult {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for DiscovererResult {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for DiscovererResult {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for DiscovererResult {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<DiscovererResult>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
diff --git a/gstreamer-pbutils/src/auto/flags.rs b/gstreamer-pbutils/src/auto/flags.rs
index b16df563a..74d4f56c2 100644
--- a/gstreamer-pbutils/src/auto/flags.rs
+++ b/gstreamer-pbutils/src/auto/flags.rs
@@ -6,8 +6,7 @@
 use bitflags::bitflags;
 use glib::translate::*;
 use glib::value::FromValue;
-use glib::value::FromValueOptional;
-use glib::value::SetValue;
+use glib::value::ToValue;
 use glib::StaticType;
 use glib::Type;
 
@@ -42,20 +41,29 @@ impl StaticType for DiscovererSerializeFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for DiscovererSerializeFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for DiscovererSerializeFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for DiscovererSerializeFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for DiscovererSerializeFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for DiscovererSerializeFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for DiscovererSerializeFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<DiscovererSerializeFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
diff --git a/gstreamer-pbutils/src/auto/versions.txt b/gstreamer-pbutils/src/auto/versions.txt
index cb68ef35f..a08888cb1 100644
--- a/gstreamer-pbutils/src/auto/versions.txt
+++ b/gstreamer-pbutils/src/auto/versions.txt
@@ -1,3 +1,3 @@
-Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
diff --git a/gstreamer-pbutils/sys/build.rs b/gstreamer-pbutils/sys/build.rs
index 4a1611df2..7831eedbf 100644
--- a/gstreamer-pbutils/sys/build.rs
+++ b/gstreamer-pbutils/sys/build.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-pbutils/sys/src/lib.rs b/gstreamer-pbutils/sys/src/lib.rs
index becb647c4..2a2bf2fcc 100644
--- a/gstreamer-pbutils/sys/src/lib.rs
+++ b/gstreamer-pbutils/sys/src/lib.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-pbutils/sys/tests/abi.rs b/gstreamer-pbutils/sys/tests/abi.rs
index 06db109b3..3915fdc45 100644
--- a/gstreamer-pbutils/sys/tests/abi.rs
+++ b/gstreamer-pbutils/sys/tests/abi.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-pbutils/sys/tests/constant.c b/gstreamer-pbutils/sys/tests/constant.c
index 72e11bf1d..0da5dbef4 100644
--- a/gstreamer-pbutils/sys/tests/constant.c
+++ b/gstreamer-pbutils/sys/tests/constant.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-pbutils/sys/tests/layout.c b/gstreamer-pbutils/sys/tests/layout.c
index ea9a3df69..8b052a699 100644
--- a/gstreamer-pbutils/sys/tests/layout.c
+++ b/gstreamer-pbutils/sys/tests/layout.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-player/src/auto/enums.rs b/gstreamer-player/src/auto/enums.rs
index 6c4342104..aaa7fe456 100644
--- a/gstreamer-player/src/auto/enums.rs
+++ b/gstreamer-player/src/auto/enums.rs
@@ -6,8 +6,7 @@
 use glib::error::ErrorDomain;
 use glib::translate::*;
 use glib::value::FromValue;
-use glib::value::FromValueOptional;
-use glib::value::SetValue;
+use glib::value::ToValue;
 use glib::Quark;
 use glib::StaticType;
 use glib::Type;
@@ -71,21 +70,30 @@ impl StaticType for PlayerColorBalanceType {
     }
 }
 
-impl<'a> FromValueOptional<'a> for PlayerColorBalanceType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for PlayerColorBalanceType {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for PlayerColorBalanceType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for PlayerColorBalanceType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for PlayerColorBalanceType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for PlayerColorBalanceType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<PlayerColorBalanceType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -156,21 +164,30 @@ impl StaticType for PlayerError {
     }
 }
 
-impl<'a> FromValueOptional<'a> for PlayerError {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for PlayerError {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for PlayerError {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for PlayerError {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for PlayerError {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for PlayerError {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<PlayerError>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -282,20 +299,29 @@ impl StaticType for PlayerState {
     }
 }
 
-impl<'a> FromValueOptional<'a> for PlayerState {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for PlayerState {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for PlayerState {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for PlayerState {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for PlayerState {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for PlayerState {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<PlayerState>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
diff --git a/gstreamer-player/src/auto/player.rs b/gstreamer-player/src/auto/player.rs
index 4ca6ce836..86b77bbeb 100644
--- a/gstreamer-player/src/auto/player.rs
+++ b/gstreamer-player/src/auto/player.rs
@@ -16,6 +16,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -345,7 +346,7 @@ impl Player {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"suburi\0".as_ptr() as *const _,
-                glib::Value::from(suburi).to_glib_none().0,
+                suburi.to_value().to_glib_none().0,
             );
         }
     }
@@ -364,7 +365,6 @@ impl Player {
             value
                 .get()
                 .expect("Return Value for property `video-multiview-flags` getter")
-                .unwrap()
         }
     }
 
@@ -374,7 +374,7 @@ impl Player {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"video-multiview-flags\0".as_ptr() as *const _,
-                glib::Value::from(&video_multiview_flags).to_glib_none().0,
+                video_multiview_flags.to_value().to_glib_none().0,
             );
         }
     }
@@ -393,7 +393,6 @@ impl Player {
             value
                 .get()
                 .expect("Return Value for property `video-multiview-mode` getter")
-                .unwrap()
         }
     }
 
@@ -406,7 +405,7 @@ impl Player {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"video-multiview-mode\0".as_ptr() as *const _,
-                glib::Value::from(&video_multiview_mode).to_glib_none().0,
+                video_multiview_mode.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-player/src/auto/player_gmain_context_signal_dispatcher.rs b/gstreamer-player/src/auto/player_gmain_context_signal_dispatcher.rs
index 9a81c2d16..10611482d 100644
--- a/gstreamer-player/src/auto/player_gmain_context_signal_dispatcher.rs
+++ b/gstreamer-player/src/auto/player_gmain_context_signal_dispatcher.rs
@@ -7,6 +7,7 @@ use crate::PlayerSignalDispatcher;
 use glib::object::ObjectType as ObjectType_;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 
 glib::wrapper! {
     pub struct PlayerGMainContextSignalDispatcher(Object<ffi::GstPlayerGMainContextSignalDispatcher, ffi::GstPlayerGMainContextSignalDispatcherClass>) @implements PlayerSignalDispatcher;
diff --git a/gstreamer-player/src/auto/player_video_overlay_video_renderer.rs b/gstreamer-player/src/auto/player_video_overlay_video_renderer.rs
index 3fe6c5a53..24d9e1e2f 100644
--- a/gstreamer-player/src/auto/player_video_overlay_video_renderer.rs
+++ b/gstreamer-player/src/auto/player_video_overlay_video_renderer.rs
@@ -10,6 +10,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem;
 use std::mem::transmute;
@@ -96,7 +97,7 @@ impl PlayerVideoOverlayVideoRenderer {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"video-sink\0".as_ptr() as *const _,
-                glib::Value::from(video_sink).to_glib_none().0,
+                video_sink.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-player/src/auto/versions.txt b/gstreamer-player/src/auto/versions.txt
index cb68ef35f..a08888cb1 100644
--- a/gstreamer-player/src/auto/versions.txt
+++ b/gstreamer-player/src/auto/versions.txt
@@ -1,3 +1,3 @@
-Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
diff --git a/gstreamer-player/sys/build.rs b/gstreamer-player/sys/build.rs
index 4a1611df2..7831eedbf 100644
--- a/gstreamer-player/sys/build.rs
+++ b/gstreamer-player/sys/build.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-player/sys/src/lib.rs b/gstreamer-player/sys/src/lib.rs
index ea1534416..a1443fca2 100644
--- a/gstreamer-player/sys/src/lib.rs
+++ b/gstreamer-player/sys/src/lib.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-player/sys/tests/abi.rs b/gstreamer-player/sys/tests/abi.rs
index a2860735f..67582dad6 100644
--- a/gstreamer-player/sys/tests/abi.rs
+++ b/gstreamer-player/sys/tests/abi.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-player/sys/tests/constant.c b/gstreamer-player/sys/tests/constant.c
index 5f49b7f3d..9ef04c102 100644
--- a/gstreamer-player/sys/tests/constant.c
+++ b/gstreamer-player/sys/tests/constant.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-player/sys/tests/layout.c b/gstreamer-player/sys/tests/layout.c
index c7103f1a1..077305dac 100644
--- a/gstreamer-player/sys/tests/layout.c
+++ b/gstreamer-player/sys/tests/layout.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-rtp/src/auto/enums.rs b/gstreamer-rtp/src/auto/enums.rs
index 86749e501..21d54908c 100644
--- a/gstreamer-rtp/src/auto/enums.rs
+++ b/gstreamer-rtp/src/auto/enums.rs
@@ -5,8 +5,7 @@
 
 use glib::translate::*;
 use glib::value::FromValue;
-use glib::value::FromValueOptional;
-use glib::value::SetValue;
+use glib::value::ToValue;
 use glib::StaticType;
 use glib::Type;
 
@@ -81,21 +80,30 @@ impl StaticType for RTCPFBType {
     }
 }
 
-impl<'a> FromValueOptional<'a> for RTCPFBType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for RTCPFBType {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for RTCPFBType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for RTCPFBType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for RTCPFBType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for RTCPFBType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<RTCPFBType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -174,21 +182,30 @@ impl StaticType for RTCPSDESType {
     }
 }
 
-impl<'a> FromValueOptional<'a> for RTCPSDESType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for RTCPSDESType {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for RTCPSDESType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for RTCPSDESType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for RTCPSDESType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for RTCPSDESType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<RTCPSDESType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -263,21 +280,30 @@ impl StaticType for RTCPType {
     }
 }
 
-impl<'a> FromValueOptional<'a> for RTCPType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for RTCPType {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for RTCPType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for RTCPType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for RTCPType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for RTCPType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<RTCPType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -358,25 +384,34 @@ impl StaticType for RTCPXRType {
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
-impl<'a> FromValueOptional<'a> for RTCPXRType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for RTCPXRType {
+    type Type = Self;
 }
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
-impl<'a> FromValue<'a> for RTCPXRType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for RTCPXRType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
-impl SetValue for RTCPXRType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for RTCPXRType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<RTCPXRType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -519,21 +554,30 @@ impl StaticType for RTPPayload {
     }
 }
 
-impl<'a> FromValueOptional<'a> for RTPPayload {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for RTPPayload {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for RTPPayload {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for RTPPayload {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for RTPPayload {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for RTPPayload {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<RTPPayload>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -592,20 +636,29 @@ impl StaticType for RTPProfile {
     }
 }
 
-impl<'a> FromValueOptional<'a> for RTPProfile {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for RTPProfile {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for RTPProfile {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for RTPProfile {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for RTPProfile {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for RTPProfile {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<RTPProfile>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
diff --git a/gstreamer-rtp/src/auto/flags.rs b/gstreamer-rtp/src/auto/flags.rs
index 3ad9e7b27..31c65f622 100644
--- a/gstreamer-rtp/src/auto/flags.rs
+++ b/gstreamer-rtp/src/auto/flags.rs
@@ -6,8 +6,7 @@
 use bitflags::bitflags;
 use glib::translate::*;
 use glib::value::FromValue;
-use glib::value::FromValueOptional;
-use glib::value::SetValue;
+use glib::value::ToValue;
 use glib::StaticType;
 use glib::Type;
 
@@ -51,25 +50,34 @@ impl StaticType for RTPBufferFlags {
 
 #[cfg(any(feature = "v1_10", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_10")))]
-impl<'a> FromValueOptional<'a> for RTPBufferFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for RTPBufferFlags {
+    type Type = Self;
 }
 
 #[cfg(any(feature = "v1_10", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_10")))]
-impl<'a> FromValue<'a> for RTPBufferFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for RTPBufferFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
 #[cfg(any(feature = "v1_10", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_10")))]
-impl SetValue for RTPBufferFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for RTPBufferFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<RTPBufferFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -102,20 +110,29 @@ impl StaticType for RTPBufferMapFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for RTPBufferMapFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for RTPBufferMapFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for RTPBufferMapFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for RTPBufferMapFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for RTPBufferMapFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for RTPBufferMapFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<RTPBufferMapFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
diff --git a/gstreamer-rtp/src/auto/versions.txt b/gstreamer-rtp/src/auto/versions.txt
index cb68ef35f..a08888cb1 100644
--- a/gstreamer-rtp/src/auto/versions.txt
+++ b/gstreamer-rtp/src/auto/versions.txt
@@ -1,3 +1,3 @@
-Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
diff --git a/gstreamer-rtp/sys/build.rs b/gstreamer-rtp/sys/build.rs
index 4a1611df2..7831eedbf 100644
--- a/gstreamer-rtp/sys/build.rs
+++ b/gstreamer-rtp/sys/build.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-rtp/sys/src/lib.rs b/gstreamer-rtp/sys/src/lib.rs
index 7fc36b10d..e9baddb4a 100644
--- a/gstreamer-rtp/sys/src/lib.rs
+++ b/gstreamer-rtp/sys/src/lib.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-rtp/sys/tests/abi.rs b/gstreamer-rtp/sys/tests/abi.rs
index ed009747b..8f883d9c2 100644
--- a/gstreamer-rtp/sys/tests/abi.rs
+++ b/gstreamer-rtp/sys/tests/abi.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-rtp/sys/tests/constant.c b/gstreamer-rtp/sys/tests/constant.c
index 57183185d..0189dd536 100644
--- a/gstreamer-rtp/sys/tests/constant.c
+++ b/gstreamer-rtp/sys/tests/constant.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-rtp/sys/tests/layout.c b/gstreamer-rtp/sys/tests/layout.c
index b564a0d1e..6fd43a0f1 100644
--- a/gstreamer-rtp/sys/tests/layout.c
+++ b/gstreamer-rtp/sys/tests/layout.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-rtsp-server/src/auto/enums.rs b/gstreamer-rtsp-server/src/auto/enums.rs
index c59a296fd..f25a5065b 100644
--- a/gstreamer-rtsp-server/src/auto/enums.rs
+++ b/gstreamer-rtsp-server/src/auto/enums.rs
@@ -5,8 +5,7 @@
 
 use glib::translate::*;
 use glib::value::FromValue;
-use glib::value::FromValueOptional;
-use glib::value::SetValue;
+use glib::value::ToValue;
 use glib::StaticType;
 use glib::Type;
 
@@ -202,21 +201,30 @@ impl StaticType for RTSPPublishClockMode {
     }
 }
 
-impl<'a> FromValueOptional<'a> for RTSPPublishClockMode {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for RTSPPublishClockMode {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for RTSPPublishClockMode {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for RTSPPublishClockMode {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for RTSPPublishClockMode {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for RTSPPublishClockMode {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<RTSPPublishClockMode>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -267,21 +275,30 @@ impl StaticType for RTSPSuspendMode {
     }
 }
 
-impl<'a> FromValueOptional<'a> for RTSPSuspendMode {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for RTSPSuspendMode {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for RTSPSuspendMode {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for RTSPSuspendMode {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for RTSPSuspendMode {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for RTSPSuspendMode {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<RTSPSuspendMode>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
diff --git a/gstreamer-rtsp-server/src/auto/flags.rs b/gstreamer-rtsp-server/src/auto/flags.rs
index bfefcb120..3b54f83af 100644
--- a/gstreamer-rtsp-server/src/auto/flags.rs
+++ b/gstreamer-rtsp-server/src/auto/flags.rs
@@ -6,8 +6,7 @@
 use bitflags::bitflags;
 use glib::translate::*;
 use glib::value::FromValue;
-use glib::value::FromValueOptional;
-use glib::value::SetValue;
+use glib::value::ToValue;
 use glib::StaticType;
 use glib::Type;
 
@@ -68,20 +67,29 @@ impl StaticType for RTSPTransportMode {
     }
 }
 
-impl<'a> FromValueOptional<'a> for RTSPTransportMode {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for RTSPTransportMode {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for RTSPTransportMode {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for RTSPTransportMode {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for RTSPTransportMode {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for RTSPTransportMode {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<RTSPTransportMode>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
diff --git a/gstreamer-rtsp-server/src/auto/rtsp_client.rs b/gstreamer-rtsp-server/src/auto/rtsp_client.rs
index b8a9f3902..51d128f27 100644
--- a/gstreamer-rtsp-server/src/auto/rtsp_client.rs
+++ b/gstreamer-rtsp-server/src/auto/rtsp_client.rs
@@ -19,6 +19,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -485,7 +486,6 @@ impl<O: IsA<RTSPClient>> RTSPClientExt for O {
             value
                 .get()
                 .expect("Return Value for property `drop-backlog` getter")
-                .unwrap()
         }
     }
 
@@ -494,7 +494,7 @@ impl<O: IsA<RTSPClient>> RTSPClientExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"drop-backlog\0".as_ptr() as *const _,
-                glib::Value::from(&drop_backlog).to_glib_none().0,
+                drop_backlog.to_value().to_glib_none().0,
             );
         }
     }
@@ -510,7 +510,6 @@ impl<O: IsA<RTSPClient>> RTSPClientExt for O {
             value
                 .get()
                 .expect("Return Value for property `post-session-timeout` getter")
-                .unwrap()
         }
     }
 
@@ -519,7 +518,7 @@ impl<O: IsA<RTSPClient>> RTSPClientExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"post-session-timeout\0".as_ptr() as *const _,
-                glib::Value::from(&post_session_timeout).to_glib_none().0,
+                post_session_timeout.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-rtsp-server/src/auto/rtsp_media.rs b/gstreamer-rtsp-server/src/auto/rtsp_media.rs
index 3107a8319..c6536ae78 100644
--- a/gstreamer-rtsp-server/src/auto/rtsp_media.rs
+++ b/gstreamer-rtsp-server/src/auto/rtsp_media.rs
@@ -17,6 +17,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 #[cfg(any(feature = "v1_18", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_18")))]
@@ -992,7 +993,6 @@ impl<O: IsA<RTSPMedia>> RTSPMediaExt for O {
             value
                 .get()
                 .expect("Return Value for property `bind-mcast-address` getter")
-                .unwrap()
         }
     }
 
@@ -1001,7 +1001,7 @@ impl<O: IsA<RTSPMedia>> RTSPMediaExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"bind-mcast-address\0".as_ptr() as *const _,
-                glib::Value::from(&bind_mcast_address).to_glib_none().0,
+                bind_mcast_address.to_value().to_glib_none().0,
             );
         }
     }
@@ -1017,7 +1017,6 @@ impl<O: IsA<RTSPMedia>> RTSPMediaExt for O {
             value
                 .get()
                 .expect("Return Value for property `dscp-qos` getter")
-                .unwrap()
         }
     }
 
@@ -1026,7 +1025,7 @@ impl<O: IsA<RTSPMedia>> RTSPMediaExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"dscp-qos\0".as_ptr() as *const _,
-                glib::Value::from(&dscp_qos).to_glib_none().0,
+                dscp_qos.to_value().to_glib_none().0,
             );
         }
     }
@@ -1042,7 +1041,6 @@ impl<O: IsA<RTSPMedia>> RTSPMediaExt for O {
             value
                 .get()
                 .expect("Return Value for property `max-mcast-ttl` getter")
-                .unwrap()
         }
     }
 
@@ -1051,7 +1049,7 @@ impl<O: IsA<RTSPMedia>> RTSPMediaExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"max-mcast-ttl\0".as_ptr() as *const _,
-                glib::Value::from(&max_mcast_ttl).to_glib_none().0,
+                max_mcast_ttl.to_value().to_glib_none().0,
             );
         }
     }
@@ -1061,7 +1059,7 @@ impl<O: IsA<RTSPMedia>> RTSPMediaExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"time-provider\0".as_ptr() as *const _,
-                glib::Value::from(&time_provider).to_glib_none().0,
+                time_provider.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-rtsp-server/src/auto/rtsp_media_factory.rs b/gstreamer-rtsp-server/src/auto/rtsp_media_factory.rs
index 0d88eb11c..083595558 100644
--- a/gstreamer-rtsp-server/src/auto/rtsp_media_factory.rs
+++ b/gstreamer-rtsp-server/src/auto/rtsp_media_factory.rs
@@ -14,6 +14,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -667,7 +668,6 @@ impl<O: IsA<RTSPMediaFactory>> RTSPMediaFactoryExt for O {
             value
                 .get()
                 .expect("Return Value for property `bind-mcast-address` getter")
-                .unwrap()
         }
     }
 
@@ -676,7 +676,7 @@ impl<O: IsA<RTSPMediaFactory>> RTSPMediaFactoryExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"bind-mcast-address\0".as_ptr() as *const _,
-                glib::Value::from(&bind_mcast_address).to_glib_none().0,
+                bind_mcast_address.to_value().to_glib_none().0,
             );
         }
     }
@@ -692,7 +692,6 @@ impl<O: IsA<RTSPMediaFactory>> RTSPMediaFactoryExt for O {
             value
                 .get()
                 .expect("Return Value for property `dscp-qos` getter")
-                .unwrap()
         }
     }
 
@@ -701,7 +700,7 @@ impl<O: IsA<RTSPMediaFactory>> RTSPMediaFactoryExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"dscp-qos\0".as_ptr() as *const _,
-                glib::Value::from(&dscp_qos).to_glib_none().0,
+                dscp_qos.to_value().to_glib_none().0,
             );
         }
     }
@@ -717,7 +716,6 @@ impl<O: IsA<RTSPMediaFactory>> RTSPMediaFactoryExt for O {
             value
                 .get()
                 .expect("Return Value for property `max-mcast-ttl` getter")
-                .unwrap()
         }
     }
 
@@ -726,7 +724,7 @@ impl<O: IsA<RTSPMediaFactory>> RTSPMediaFactoryExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"max-mcast-ttl\0".as_ptr() as *const _,
-                glib::Value::from(&max_mcast_ttl).to_glib_none().0,
+                max_mcast_ttl.to_value().to_glib_none().0,
             );
         }
     }
@@ -742,7 +740,6 @@ impl<O: IsA<RTSPMediaFactory>> RTSPMediaFactoryExt for O {
             value
                 .get()
                 .expect("Return Value for property `stop-on-disconnect` getter")
-                .unwrap()
         }
     }
 
diff --git a/gstreamer-rtsp-server/src/auto/rtsp_media_factory_uri.rs b/gstreamer-rtsp-server/src/auto/rtsp_media_factory_uri.rs
index 38da585dd..10bc4b7e2 100644
--- a/gstreamer-rtsp-server/src/auto/rtsp_media_factory_uri.rs
+++ b/gstreamer-rtsp-server/src/auto/rtsp_media_factory_uri.rs
@@ -10,6 +10,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -93,7 +94,6 @@ impl<O: IsA<RTSPMediaFactoryURI>> RTSPMediaFactoryURIExt for O {
             value
                 .get()
                 .expect("Return Value for property `use-gstpay` getter")
-                .unwrap()
         }
     }
 
@@ -102,7 +102,7 @@ impl<O: IsA<RTSPMediaFactoryURI>> RTSPMediaFactoryURIExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"use-gstpay\0".as_ptr() as *const _,
-                glib::Value::from(&use_gstpay).to_glib_none().0,
+                use_gstpay.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-rtsp-server/src/auto/rtsp_server.rs b/gstreamer-rtsp-server/src/auto/rtsp_server.rs
index f0c7f766f..3ef1545c6 100644
--- a/gstreamer-rtsp-server/src/auto/rtsp_server.rs
+++ b/gstreamer-rtsp-server/src/auto/rtsp_server.rs
@@ -15,6 +15,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 use std::ptr;
@@ -435,7 +436,6 @@ impl<O: IsA<RTSPServer>> RTSPServerExt for O {
             value
                 .get()
                 .expect("Return Value for property `content-length-limit` getter")
-                .unwrap()
         }
     }
 
@@ -444,7 +444,7 @@ impl<O: IsA<RTSPServer>> RTSPServerExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"content-length-limit\0".as_ptr() as *const _,
-                glib::Value::from(&content_length_limit).to_glib_none().0,
+                content_length_limit.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-rtsp-server/src/auto/rtsp_session.rs b/gstreamer-rtsp-server/src/auto/rtsp_session.rs
index 558e344c2..e22d8f54f 100644
--- a/gstreamer-rtsp-server/src/auto/rtsp_session.rs
+++ b/gstreamer-rtsp-server/src/auto/rtsp_session.rs
@@ -12,6 +12,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem;
 use std::mem::transmute;
@@ -276,7 +277,6 @@ impl<O: IsA<RTSPSession>> RTSPSessionExt for O {
             value
                 .get()
                 .expect("Return Value for property `extra-timeout` getter")
-                .unwrap()
         }
     }
 
@@ -285,7 +285,7 @@ impl<O: IsA<RTSPSession>> RTSPSessionExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"extra-timeout\0".as_ptr() as *const _,
-                glib::Value::from(&extra_timeout).to_glib_none().0,
+                extra_timeout.to_value().to_glib_none().0,
             );
         }
     }
@@ -301,7 +301,6 @@ impl<O: IsA<RTSPSession>> RTSPSessionExt for O {
             value
                 .get()
                 .expect("Return Value for property `timeout-always-visible` getter")
-                .unwrap()
         }
     }
 
@@ -310,7 +309,7 @@ impl<O: IsA<RTSPSession>> RTSPSessionExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"timeout-always-visible\0".as_ptr() as *const _,
-                glib::Value::from(&timeout_always_visible).to_glib_none().0,
+                timeout_always_visible.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-rtsp-server/src/auto/versions.txt b/gstreamer-rtsp-server/src/auto/versions.txt
index cb68ef35f..a08888cb1 100644
--- a/gstreamer-rtsp-server/src/auto/versions.txt
+++ b/gstreamer-rtsp-server/src/auto/versions.txt
@@ -1,3 +1,3 @@
-Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
diff --git a/gstreamer-rtsp-server/sys/build.rs b/gstreamer-rtsp-server/sys/build.rs
index 4a1611df2..7831eedbf 100644
--- a/gstreamer-rtsp-server/sys/build.rs
+++ b/gstreamer-rtsp-server/sys/build.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-rtsp-server/sys/src/lib.rs b/gstreamer-rtsp-server/sys/src/lib.rs
index 1cc38de80..d06ba68a4 100644
--- a/gstreamer-rtsp-server/sys/src/lib.rs
+++ b/gstreamer-rtsp-server/sys/src/lib.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-rtsp-server/sys/tests/abi.rs b/gstreamer-rtsp-server/sys/tests/abi.rs
index 993114a40..0630d4902 100644
--- a/gstreamer-rtsp-server/sys/tests/abi.rs
+++ b/gstreamer-rtsp-server/sys/tests/abi.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-rtsp-server/sys/tests/constant.c b/gstreamer-rtsp-server/sys/tests/constant.c
index 535d89c55..69372fd25 100644
--- a/gstreamer-rtsp-server/sys/tests/constant.c
+++ b/gstreamer-rtsp-server/sys/tests/constant.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-rtsp-server/sys/tests/layout.c b/gstreamer-rtsp-server/sys/tests/layout.c
index b8aaa34b5..cdb4b1d00 100644
--- a/gstreamer-rtsp-server/sys/tests/layout.c
+++ b/gstreamer-rtsp-server/sys/tests/layout.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-rtsp/src/auto/enums.rs b/gstreamer-rtsp/src/auto/enums.rs
index c568fa6e5..b08045805 100644
--- a/gstreamer-rtsp/src/auto/enums.rs
+++ b/gstreamer-rtsp/src/auto/enums.rs
@@ -5,8 +5,7 @@
 
 use glib::translate::*;
 use glib::value::FromValue;
-use glib::value::FromValueOptional;
-use glib::value::SetValue;
+use glib::value::ToValue;
 use glib::StaticType;
 use glib::Type;
 
@@ -57,21 +56,30 @@ impl StaticType for RTSPAuthMethod {
     }
 }
 
-impl<'a> FromValueOptional<'a> for RTSPAuthMethod {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for RTSPAuthMethod {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for RTSPAuthMethod {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for RTSPAuthMethod {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for RTSPAuthMethod {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for RTSPAuthMethod {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<RTSPAuthMethod>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -122,21 +130,30 @@ impl StaticType for RTSPFamily {
     }
 }
 
-impl<'a> FromValueOptional<'a> for RTSPFamily {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for RTSPFamily {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for RTSPFamily {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for RTSPFamily {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for RTSPFamily {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for RTSPFamily {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<RTSPFamily>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -535,21 +552,30 @@ impl StaticType for RTSPHeaderField {
     }
 }
 
-impl<'a> FromValueOptional<'a> for RTSPHeaderField {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for RTSPHeaderField {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for RTSPHeaderField {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for RTSPHeaderField {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for RTSPHeaderField {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for RTSPHeaderField {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<RTSPHeaderField>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -612,21 +638,30 @@ impl StaticType for RTSPMsgType {
     }
 }
 
-impl<'a> FromValueOptional<'a> for RTSPMsgType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for RTSPMsgType {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for RTSPMsgType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for RTSPMsgType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for RTSPMsgType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for RTSPMsgType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<RTSPMsgType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -685,21 +720,30 @@ impl StaticType for RTSPRangeUnit {
     }
 }
 
-impl<'a> FromValueOptional<'a> for RTSPRangeUnit {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for RTSPRangeUnit {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for RTSPRangeUnit {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for RTSPRangeUnit {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for RTSPRangeUnit {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for RTSPRangeUnit {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<RTSPRangeUnit>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -810,21 +854,30 @@ impl StaticType for RTSPResult {
     }
 }
 
-impl<'a> FromValueOptional<'a> for RTSPResult {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for RTSPResult {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for RTSPResult {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for RTSPResult {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for RTSPResult {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for RTSPResult {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<RTSPResult>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -887,21 +940,30 @@ impl StaticType for RTSPState {
     }
 }
 
-impl<'a> FromValueOptional<'a> for RTSPState {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for RTSPState {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for RTSPState {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for RTSPState {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for RTSPState {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for RTSPState {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<RTSPState>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1132,21 +1194,30 @@ impl StaticType for RTSPStatusCode {
     }
 }
 
-impl<'a> FromValueOptional<'a> for RTSPStatusCode {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for RTSPStatusCode {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for RTSPStatusCode {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for RTSPStatusCode {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for RTSPStatusCode {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for RTSPStatusCode {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<RTSPStatusCode>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1205,20 +1276,29 @@ impl StaticType for RTSPTimeType {
     }
 }
 
-impl<'a> FromValueOptional<'a> for RTSPTimeType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for RTSPTimeType {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for RTSPTimeType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for RTSPTimeType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for RTSPTimeType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for RTSPTimeType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<RTSPTimeType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
diff --git a/gstreamer-rtsp/src/auto/flags.rs b/gstreamer-rtsp/src/auto/flags.rs
index 46dc420a8..b18445079 100644
--- a/gstreamer-rtsp/src/auto/flags.rs
+++ b/gstreamer-rtsp/src/auto/flags.rs
@@ -6,8 +6,7 @@
 use bitflags::bitflags;
 use glib::translate::*;
 use glib::value::FromValue;
-use glib::value::FromValueOptional;
-use glib::value::SetValue;
+use glib::value::ToValue;
 use glib::StaticType;
 use glib::Type;
 
@@ -41,21 +40,30 @@ impl StaticType for RTSPEvent {
     }
 }
 
-impl<'a> FromValueOptional<'a> for RTSPEvent {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for RTSPEvent {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for RTSPEvent {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for RTSPEvent {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for RTSPEvent {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for RTSPEvent {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<RTSPEvent>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -92,21 +100,30 @@ impl StaticType for RTSPLowerTrans {
     }
 }
 
-impl<'a> FromValueOptional<'a> for RTSPLowerTrans {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for RTSPLowerTrans {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for RTSPLowerTrans {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for RTSPLowerTrans {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for RTSPLowerTrans {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for RTSPLowerTrans {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<RTSPLowerTrans>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -159,21 +176,30 @@ impl StaticType for RTSPMethod {
     }
 }
 
-impl<'a> FromValueOptional<'a> for RTSPMethod {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for RTSPMethod {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for RTSPMethod {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for RTSPMethod {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for RTSPMethod {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for RTSPMethod {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<RTSPMethod>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -209,21 +235,30 @@ impl StaticType for RTSPProfile {
     }
 }
 
-impl<'a> FromValueOptional<'a> for RTSPProfile {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for RTSPProfile {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for RTSPProfile {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for RTSPProfile {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for RTSPProfile {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for RTSPProfile {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<RTSPProfile>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -257,20 +292,29 @@ impl StaticType for RTSPTransMode {
     }
 }
 
-impl<'a> FromValueOptional<'a> for RTSPTransMode {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for RTSPTransMode {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for RTSPTransMode {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for RTSPTransMode {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for RTSPTransMode {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for RTSPTransMode {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<RTSPTransMode>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
diff --git a/gstreamer-rtsp/src/auto/versions.txt b/gstreamer-rtsp/src/auto/versions.txt
index cb68ef35f..a08888cb1 100644
--- a/gstreamer-rtsp/src/auto/versions.txt
+++ b/gstreamer-rtsp/src/auto/versions.txt
@@ -1,3 +1,3 @@
-Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
diff --git a/gstreamer-rtsp/sys/build.rs b/gstreamer-rtsp/sys/build.rs
index 4a1611df2..7831eedbf 100644
--- a/gstreamer-rtsp/sys/build.rs
+++ b/gstreamer-rtsp/sys/build.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-rtsp/sys/src/lib.rs b/gstreamer-rtsp/sys/src/lib.rs
index f45184b5e..52d32430c 100644
--- a/gstreamer-rtsp/sys/src/lib.rs
+++ b/gstreamer-rtsp/sys/src/lib.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-rtsp/sys/tests/abi.rs b/gstreamer-rtsp/sys/tests/abi.rs
index 56a3bd6fb..bc9d2f7a9 100644
--- a/gstreamer-rtsp/sys/tests/abi.rs
+++ b/gstreamer-rtsp/sys/tests/abi.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-rtsp/sys/tests/constant.c b/gstreamer-rtsp/sys/tests/constant.c
index 3004b12cd..1a41ad8f1 100644
--- a/gstreamer-rtsp/sys/tests/constant.c
+++ b/gstreamer-rtsp/sys/tests/constant.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-rtsp/sys/tests/layout.c b/gstreamer-rtsp/sys/tests/layout.c
index cf5965a6d..7e24cb06b 100644
--- a/gstreamer-rtsp/sys/tests/layout.c
+++ b/gstreamer-rtsp/sys/tests/layout.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-sdp/src/auto/versions.txt b/gstreamer-sdp/src/auto/versions.txt
index cb68ef35f..a08888cb1 100644
--- a/gstreamer-sdp/src/auto/versions.txt
+++ b/gstreamer-sdp/src/auto/versions.txt
@@ -1,3 +1,3 @@
-Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
diff --git a/gstreamer-sdp/sys/build.rs b/gstreamer-sdp/sys/build.rs
index 4a1611df2..7831eedbf 100644
--- a/gstreamer-sdp/sys/build.rs
+++ b/gstreamer-sdp/sys/build.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-sdp/sys/src/lib.rs b/gstreamer-sdp/sys/src/lib.rs
index 478267864..eb75de338 100644
--- a/gstreamer-sdp/sys/src/lib.rs
+++ b/gstreamer-sdp/sys/src/lib.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-sdp/sys/tests/abi.rs b/gstreamer-sdp/sys/tests/abi.rs
index 78ba248d7..a01877571 100644
--- a/gstreamer-sdp/sys/tests/abi.rs
+++ b/gstreamer-sdp/sys/tests/abi.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-sdp/sys/tests/constant.c b/gstreamer-sdp/sys/tests/constant.c
index fcda9c47f..154359f5d 100644
--- a/gstreamer-sdp/sys/tests/constant.c
+++ b/gstreamer-sdp/sys/tests/constant.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-sdp/sys/tests/layout.c b/gstreamer-sdp/sys/tests/layout.c
index ec95d6304..a59c57d97 100644
--- a/gstreamer-sdp/sys/tests/layout.c
+++ b/gstreamer-sdp/sys/tests/layout.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-tag/sys/build.rs b/gstreamer-tag/sys/build.rs
index 4a1611df2..7831eedbf 100644
--- a/gstreamer-tag/sys/build.rs
+++ b/gstreamer-tag/sys/build.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-tag/sys/src/lib.rs b/gstreamer-tag/sys/src/lib.rs
index b7cb99088..c97458652 100644
--- a/gstreamer-tag/sys/src/lib.rs
+++ b/gstreamer-tag/sys/src/lib.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-tag/sys/tests/abi.rs b/gstreamer-tag/sys/tests/abi.rs
index b175dccfd..5a05b0907 100644
--- a/gstreamer-tag/sys/tests/abi.rs
+++ b/gstreamer-tag/sys/tests/abi.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-tag/sys/tests/constant.c b/gstreamer-tag/sys/tests/constant.c
index fcfc48221..c2d4d28a8 100644
--- a/gstreamer-tag/sys/tests/constant.c
+++ b/gstreamer-tag/sys/tests/constant.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-tag/sys/tests/layout.c b/gstreamer-tag/sys/tests/layout.c
index 704e72f6d..6905aaa97 100644
--- a/gstreamer-tag/sys/tests/layout.c
+++ b/gstreamer-tag/sys/tests/layout.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-video/src/auto/enums.rs b/gstreamer-video/src/auto/enums.rs
index e3683904f..95ef13a13 100644
--- a/gstreamer-video/src/auto/enums.rs
+++ b/gstreamer-video/src/auto/enums.rs
@@ -5,8 +5,7 @@
 
 use glib::translate::*;
 use glib::value::FromValue;
-use glib::value::FromValueOptional;
-use glib::value::SetValue;
+use glib::value::ToValue;
 use glib::StaticType;
 use glib::Type;
 use std::ffi::CStr;
@@ -69,25 +68,34 @@ impl StaticType for VideoAFDSpec {
 
 #[cfg(any(feature = "v1_18", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_18")))]
-impl<'a> FromValueOptional<'a> for VideoAFDSpec {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoAFDSpec {
+    type Type = Self;
 }
 
 #[cfg(any(feature = "v1_18", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_18")))]
-impl<'a> FromValue<'a> for VideoAFDSpec {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoAFDSpec {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
 #[cfg(any(feature = "v1_18", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_18")))]
-impl SetValue for VideoAFDSpec {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoAFDSpec {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoAFDSpec>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -180,25 +188,34 @@ impl StaticType for VideoAFDValue {
 
 #[cfg(any(feature = "v1_18", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_18")))]
-impl<'a> FromValueOptional<'a> for VideoAFDValue {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoAFDValue {
+    type Type = Self;
 }
 
 #[cfg(any(feature = "v1_18", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_18")))]
-impl<'a> FromValue<'a> for VideoAFDValue {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoAFDValue {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
 #[cfg(any(feature = "v1_18", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_18")))]
-impl SetValue for VideoAFDValue {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoAFDValue {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoAFDValue>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -249,21 +266,30 @@ impl StaticType for VideoAlphaMode {
     }
 }
 
-impl<'a> FromValueOptional<'a> for VideoAlphaMode {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoAlphaMode {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for VideoAlphaMode {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoAlphaMode {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for VideoAlphaMode {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoAlphaMode {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoAlphaMode>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -348,25 +374,34 @@ impl StaticType for VideoCaptionType {
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
-impl<'a> FromValueOptional<'a> for VideoCaptionType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoCaptionType {
+    type Type = Self;
 }
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
-impl<'a> FromValue<'a> for VideoCaptionType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoCaptionType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
-impl SetValue for VideoCaptionType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoCaptionType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoCaptionType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -421,21 +456,30 @@ impl StaticType for VideoChromaMode {
     }
 }
 
-impl<'a> FromValueOptional<'a> for VideoChromaMode {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoChromaMode {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for VideoChromaMode {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoChromaMode {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for VideoChromaMode {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoChromaMode {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoChromaMode>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -520,21 +564,30 @@ impl StaticType for VideoColorMatrix {
     }
 }
 
-impl<'a> FromValueOptional<'a> for VideoColorMatrix {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoColorMatrix {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for VideoColorMatrix {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoColorMatrix {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for VideoColorMatrix {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoColorMatrix {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoColorMatrix>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -664,21 +717,30 @@ impl StaticType for VideoColorPrimaries {
     }
 }
 
-impl<'a> FromValueOptional<'a> for VideoColorPrimaries {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoColorPrimaries {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for VideoColorPrimaries {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoColorPrimaries {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for VideoColorPrimaries {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoColorPrimaries {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoColorPrimaries>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -737,21 +799,30 @@ impl StaticType for VideoDitherMethod {
     }
 }
 
-impl<'a> FromValueOptional<'a> for VideoDitherMethod {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoDitherMethod {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for VideoDitherMethod {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoDitherMethod {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for VideoDitherMethod {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoDitherMethod {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoDitherMethod>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -835,25 +906,34 @@ impl StaticType for VideoFieldOrder {
 
 #[cfg(any(feature = "v1_12", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_12")))]
-impl<'a> FromValueOptional<'a> for VideoFieldOrder {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoFieldOrder {
+    type Type = Self;
 }
 
 #[cfg(any(feature = "v1_12", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_12")))]
-impl<'a> FromValue<'a> for VideoFieldOrder {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoFieldOrder {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
 #[cfg(any(feature = "v1_12", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_12")))]
-impl SetValue for VideoFieldOrder {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoFieldOrder {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoFieldOrder>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1472,21 +1552,30 @@ impl StaticType for VideoFormat {
     }
 }
 
-impl<'a> FromValueOptional<'a> for VideoFormat {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoFormat {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for VideoFormat {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoFormat {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for VideoFormat {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoFormat {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoFormat>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1533,21 +1622,30 @@ impl StaticType for VideoGammaMode {
     }
 }
 
-impl<'a> FromValueOptional<'a> for VideoGammaMode {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoGammaMode {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for VideoGammaMode {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoGammaMode {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for VideoGammaMode {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoGammaMode {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoGammaMode>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1641,21 +1739,30 @@ impl StaticType for VideoInterlaceMode {
     }
 }
 
-impl<'a> FromValueOptional<'a> for VideoInterlaceMode {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoInterlaceMode {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for VideoInterlaceMode {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoInterlaceMode {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for VideoInterlaceMode {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoInterlaceMode {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoInterlaceMode>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1710,21 +1817,30 @@ impl StaticType for VideoMatrixMode {
     }
 }
 
-impl<'a> FromValueOptional<'a> for VideoMatrixMode {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoMatrixMode {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for VideoMatrixMode {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoMatrixMode {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for VideoMatrixMode {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoMatrixMode {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoMatrixMode>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1815,21 +1931,30 @@ impl StaticType for VideoMultiviewFramePacking {
     }
 }
 
-impl<'a> FromValueOptional<'a> for VideoMultiviewFramePacking {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoMultiviewFramePacking {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for VideoMultiviewFramePacking {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoMultiviewFramePacking {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for VideoMultiviewFramePacking {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoMultiviewFramePacking {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoMultiviewFramePacking>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1944,21 +2069,30 @@ impl StaticType for VideoMultiviewMode {
     }
 }
 
-impl<'a> FromValueOptional<'a> for VideoMultiviewMode {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoMultiviewMode {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for VideoMultiviewMode {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoMultiviewMode {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for VideoMultiviewMode {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoMultiviewMode {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoMultiviewMode>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -2047,25 +2181,34 @@ impl StaticType for VideoOrientationMethod {
 
 #[cfg(any(feature = "v1_10", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_10")))]
-impl<'a> FromValueOptional<'a> for VideoOrientationMethod {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoOrientationMethod {
+    type Type = Self;
 }
 
 #[cfg(any(feature = "v1_10", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_10")))]
-impl<'a> FromValue<'a> for VideoOrientationMethod {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoOrientationMethod {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
 #[cfg(any(feature = "v1_10", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_10")))]
-impl SetValue for VideoOrientationMethod {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoOrientationMethod {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoOrientationMethod>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -2116,21 +2259,30 @@ impl StaticType for VideoPrimariesMode {
     }
 }
 
-impl<'a> FromValueOptional<'a> for VideoPrimariesMode {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoPrimariesMode {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for VideoPrimariesMode {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoPrimariesMode {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for VideoPrimariesMode {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoPrimariesMode {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoPrimariesMode>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -2189,21 +2341,30 @@ impl StaticType for VideoResamplerMethod {
     }
 }
 
-impl<'a> FromValueOptional<'a> for VideoResamplerMethod {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoResamplerMethod {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for VideoResamplerMethod {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoResamplerMethod {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for VideoResamplerMethod {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoResamplerMethod {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoResamplerMethod>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -2258,21 +2419,30 @@ impl StaticType for VideoTileMode {
     }
 }
 
-impl<'a> FromValueOptional<'a> for VideoTileMode {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoTileMode {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for VideoTileMode {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoTileMode {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for VideoTileMode {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoTileMode {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoTileMode>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -2428,20 +2598,29 @@ impl StaticType for VideoTransferFunction {
     }
 }
 
-impl<'a> FromValueOptional<'a> for VideoTransferFunction {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoTransferFunction {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for VideoTransferFunction {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoTransferFunction {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for VideoTransferFunction {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoTransferFunction {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoTransferFunction>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
diff --git a/gstreamer-video/src/auto/flags.rs b/gstreamer-video/src/auto/flags.rs
index c04fa157e..d654694e3 100644
--- a/gstreamer-video/src/auto/flags.rs
+++ b/gstreamer-video/src/auto/flags.rs
@@ -6,8 +6,7 @@
 use bitflags::bitflags;
 use glib::translate::*;
 use glib::value::FromValue;
-use glib::value::FromValueOptional;
-use glib::value::SetValue;
+use glib::value::ToValue;
 use glib::StaticType;
 use glib::Type;
 
@@ -54,21 +53,30 @@ impl StaticType for VideoBufferFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for VideoBufferFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoBufferFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for VideoBufferFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoBufferFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for VideoBufferFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoBufferFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoBufferFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -108,21 +116,30 @@ impl StaticType for VideoChromaSite {
     }
 }
 
-impl<'a> FromValueOptional<'a> for VideoChromaSite {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoChromaSite {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for VideoChromaSite {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoChromaSite {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for VideoChromaSite {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoChromaSite {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoChromaSite>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -182,21 +199,30 @@ impl StaticType for VideoFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for VideoFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for VideoFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for VideoFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -237,21 +263,30 @@ impl StaticType for VideoFormatFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for VideoFormatFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoFormatFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for VideoFormatFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoFormatFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for VideoFormatFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoFormatFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoFormatFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -291,21 +326,30 @@ impl StaticType for VideoFrameFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for VideoFrameFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoFrameFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for VideoFrameFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoFrameFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for VideoFrameFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoFrameFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoFrameFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -344,21 +388,30 @@ impl StaticType for VideoMultiviewFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for VideoMultiviewFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoMultiviewFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for VideoMultiviewFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoMultiviewFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for VideoMultiviewFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoMultiviewFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoMultiviewFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -396,25 +449,34 @@ impl StaticType for VideoOverlayFormatFlags {
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
-impl<'a> FromValueOptional<'a> for VideoOverlayFormatFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoOverlayFormatFlags {
+    type Type = Self;
 }
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
-impl<'a> FromValue<'a> for VideoOverlayFormatFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoOverlayFormatFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
-impl SetValue for VideoOverlayFormatFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoOverlayFormatFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoOverlayFormatFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -448,21 +510,30 @@ impl StaticType for VideoPackFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for VideoPackFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoPackFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for VideoPackFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoPackFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for VideoPackFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoPackFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoPackFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -506,24 +577,33 @@ impl StaticType for VideoTimeCodeFlags {
 
 #[cfg(any(feature = "v1_18", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_18")))]
-impl<'a> FromValueOptional<'a> for VideoTimeCodeFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for VideoTimeCodeFlags {
+    type Type = Self;
 }
 
 #[cfg(any(feature = "v1_18", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_18")))]
-impl<'a> FromValue<'a> for VideoTimeCodeFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for VideoTimeCodeFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
 #[cfg(any(feature = "v1_18", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_18")))]
-impl SetValue for VideoTimeCodeFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for VideoTimeCodeFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<VideoTimeCodeFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
diff --git a/gstreamer-video/src/auto/versions.txt b/gstreamer-video/src/auto/versions.txt
index cb68ef35f..a08888cb1 100644
--- a/gstreamer-video/src/auto/versions.txt
+++ b/gstreamer-video/src/auto/versions.txt
@@ -1,3 +1,3 @@
-Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
diff --git a/gstreamer-video/src/auto/video_decoder.rs b/gstreamer-video/src/auto/video_decoder.rs
index 598fd8098..705d9883e 100644
--- a/gstreamer-video/src/auto/video_decoder.rs
+++ b/gstreamer-video/src/auto/video_decoder.rs
@@ -20,6 +20,9 @@ use glib::translate::*;
 use glib::StaticType;
 #[cfg(any(feature = "v1_18", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_18")))]
+use glib::ToValue;
+#[cfg(any(feature = "v1_18", feature = "dox"))]
+#[cfg_attr(feature = "dox", doc(cfg(feature = "v1_18")))]
 use std::boxed::Box as Box_;
 #[cfg(any(feature = "v1_18", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_18")))]
@@ -252,10 +255,7 @@ impl<O: IsA<VideoDecoder>> VideoDecoderExt for O {
                 b"qos\0".as_ptr() as *const _,
                 value.to_glib_none_mut().0,
             );
-            value
-                .get()
-                .expect("Return Value for property `qos` getter")
-                .unwrap()
+            value.get().expect("Return Value for property `qos` getter")
         }
     }
 
@@ -266,7 +266,7 @@ impl<O: IsA<VideoDecoder>> VideoDecoderExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"qos\0".as_ptr() as *const _,
-                glib::Value::from(&qos).to_glib_none().0,
+                qos.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-video/src/auto/video_encoder.rs b/gstreamer-video/src/auto/video_encoder.rs
index 84aecdf92..88f211c11 100644
--- a/gstreamer-video/src/auto/video_encoder.rs
+++ b/gstreamer-video/src/auto/video_encoder.rs
@@ -12,6 +12,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -195,10 +196,7 @@ impl<O: IsA<VideoEncoder>> VideoEncoderExt for O {
                 b"qos\0".as_ptr() as *const _,
                 value.to_glib_none_mut().0,
             );
-            value
-                .get()
-                .expect("Return Value for property `qos` getter")
-                .unwrap()
+            value.get().expect("Return Value for property `qos` getter")
         }
     }
 
@@ -207,7 +205,7 @@ impl<O: IsA<VideoEncoder>> VideoEncoderExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"qos\0".as_ptr() as *const _,
-                glib::Value::from(&qos).to_glib_none().0,
+                qos.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-video/src/auto/video_sink.rs b/gstreamer-video/src/auto/video_sink.rs
index ab5e2d2d7..c67f88eae 100644
--- a/gstreamer-video/src/auto/video_sink.rs
+++ b/gstreamer-video/src/auto/video_sink.rs
@@ -9,6 +9,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -50,7 +51,6 @@ impl<O: IsA<VideoSink>> VideoSinkExt for O {
             value
                 .get()
                 .expect("Return Value for property `show-preroll-frame` getter")
-                .unwrap()
         }
     }
 
@@ -59,7 +59,7 @@ impl<O: IsA<VideoSink>> VideoSinkExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"show-preroll-frame\0".as_ptr() as *const _,
-                glib::Value::from(&show_preroll_frame).to_glib_none().0,
+                show_preroll_frame.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer-video/sys/build.rs b/gstreamer-video/sys/build.rs
index 4a1611df2..7831eedbf 100644
--- a/gstreamer-video/sys/build.rs
+++ b/gstreamer-video/sys/build.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-video/sys/src/lib.rs b/gstreamer-video/sys/src/lib.rs
index 035b4dfc0..f4dc0d8a6 100644
--- a/gstreamer-video/sys/src/lib.rs
+++ b/gstreamer-video/sys/src/lib.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-video/sys/tests/abi.rs b/gstreamer-video/sys/tests/abi.rs
index 37ffcf509..029992193 100644
--- a/gstreamer-video/sys/tests/abi.rs
+++ b/gstreamer-video/sys/tests/abi.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-video/sys/tests/constant.c b/gstreamer-video/sys/tests/constant.c
index 0305be822..3fee74eee 100644
--- a/gstreamer-video/sys/tests/constant.c
+++ b/gstreamer-video/sys/tests/constant.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-video/sys/tests/layout.c b/gstreamer-video/sys/tests/layout.c
index 19c36ef42..bf8e7fb06 100644
--- a/gstreamer-video/sys/tests/layout.c
+++ b/gstreamer-video/sys/tests/layout.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-webrtc/src/auto/enums.rs b/gstreamer-webrtc/src/auto/enums.rs
index e91ce419d..dcfa96276 100644
--- a/gstreamer-webrtc/src/auto/enums.rs
+++ b/gstreamer-webrtc/src/auto/enums.rs
@@ -5,8 +5,7 @@
 
 use glib::translate::*;
 use glib::value::FromValue;
-use glib::value::FromValueOptional;
-use glib::value::SetValue;
+use glib::value::ToValue;
 use glib::StaticType;
 use glib::Type;
 use std::ffi::CStr;
@@ -73,25 +72,34 @@ impl StaticType for WebRTCBundlePolicy {
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
-impl<'a> FromValueOptional<'a> for WebRTCBundlePolicy {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for WebRTCBundlePolicy {
+    type Type = Self;
 }
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
-impl<'a> FromValue<'a> for WebRTCBundlePolicy {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for WebRTCBundlePolicy {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
-impl SetValue for WebRTCBundlePolicy {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for WebRTCBundlePolicy {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<WebRTCBundlePolicy>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -146,21 +154,30 @@ impl StaticType for WebRTCDTLSSetup {
     }
 }
 
-impl<'a> FromValueOptional<'a> for WebRTCDTLSSetup {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for WebRTCDTLSSetup {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for WebRTCDTLSSetup {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for WebRTCDTLSSetup {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for WebRTCDTLSSetup {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for WebRTCDTLSSetup {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<WebRTCDTLSSetup>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -219,21 +236,30 @@ impl StaticType for WebRTCDTLSTransportState {
     }
 }
 
-impl<'a> FromValueOptional<'a> for WebRTCDTLSTransportState {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for WebRTCDTLSTransportState {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for WebRTCDTLSTransportState {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for WebRTCDTLSTransportState {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for WebRTCDTLSTransportState {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for WebRTCDTLSTransportState {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<WebRTCDTLSTransportState>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -302,25 +328,34 @@ impl StaticType for WebRTCDataChannelState {
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
-impl<'a> FromValueOptional<'a> for WebRTCDataChannelState {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for WebRTCDataChannelState {
+    type Type = Self;
 }
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
-impl<'a> FromValue<'a> for WebRTCDataChannelState {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for WebRTCDataChannelState {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
-impl SetValue for WebRTCDataChannelState {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for WebRTCDataChannelState {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<WebRTCDataChannelState>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -377,25 +412,34 @@ impl StaticType for WebRTCFECType {
 
 #[cfg(any(feature = "v1_14_1", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_14_1")))]
-impl<'a> FromValueOptional<'a> for WebRTCFECType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for WebRTCFECType {
+    type Type = Self;
 }
 
 #[cfg(any(feature = "v1_14_1", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_14_1")))]
-impl<'a> FromValue<'a> for WebRTCFECType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for WebRTCFECType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
 #[cfg(any(feature = "v1_14_1", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_14_1")))]
-impl SetValue for WebRTCFECType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for WebRTCFECType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<WebRTCFECType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -442,21 +486,30 @@ impl StaticType for WebRTCICEComponent {
     }
 }
 
-impl<'a> FromValueOptional<'a> for WebRTCICEComponent {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for WebRTCICEComponent {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for WebRTCICEComponent {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for WebRTCICEComponent {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for WebRTCICEComponent {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for WebRTCICEComponent {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<WebRTCICEComponent>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -525,21 +578,30 @@ impl StaticType for WebRTCICEConnectionState {
     }
 }
 
-impl<'a> FromValueOptional<'a> for WebRTCICEConnectionState {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for WebRTCICEConnectionState {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for WebRTCICEConnectionState {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for WebRTCICEConnectionState {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for WebRTCICEConnectionState {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for WebRTCICEConnectionState {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<WebRTCICEConnectionState>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -590,21 +652,30 @@ impl StaticType for WebRTCICEGatheringState {
     }
 }
 
-impl<'a> FromValueOptional<'a> for WebRTCICEGatheringState {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for WebRTCICEGatheringState {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for WebRTCICEGatheringState {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for WebRTCICEGatheringState {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for WebRTCICEGatheringState {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for WebRTCICEGatheringState {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<WebRTCICEGatheringState>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -651,21 +722,30 @@ impl StaticType for WebRTCICERole {
     }
 }
 
-impl<'a> FromValueOptional<'a> for WebRTCICERole {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for WebRTCICERole {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for WebRTCICERole {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for WebRTCICERole {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for WebRTCICERole {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for WebRTCICERole {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<WebRTCICERole>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -722,25 +802,34 @@ impl StaticType for WebRTCICETransportPolicy {
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
-impl<'a> FromValueOptional<'a> for WebRTCICETransportPolicy {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for WebRTCICETransportPolicy {
+    type Type = Self;
 }
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
-impl<'a> FromValue<'a> for WebRTCICETransportPolicy {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for WebRTCICETransportPolicy {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
-impl SetValue for WebRTCICETransportPolicy {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for WebRTCICETransportPolicy {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<WebRTCICETransportPolicy>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -807,21 +896,30 @@ impl StaticType for WebRTCPeerConnectionState {
     }
 }
 
-impl<'a> FromValueOptional<'a> for WebRTCPeerConnectionState {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for WebRTCPeerConnectionState {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for WebRTCPeerConnectionState {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for WebRTCPeerConnectionState {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for WebRTCPeerConnectionState {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for WebRTCPeerConnectionState {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<WebRTCPeerConnectionState>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -886,25 +984,34 @@ impl StaticType for WebRTCPriorityType {
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
-impl<'a> FromValueOptional<'a> for WebRTCPriorityType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for WebRTCPriorityType {
+    type Type = Self;
 }
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
-impl<'a> FromValue<'a> for WebRTCPriorityType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for WebRTCPriorityType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
-impl SetValue for WebRTCPriorityType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for WebRTCPriorityType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<WebRTCPriorityType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -971,21 +1078,30 @@ impl StaticType for WebRTCRTPTransceiverDirection {
     }
 }
 
-impl<'a> FromValueOptional<'a> for WebRTCRTPTransceiverDirection {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for WebRTCRTPTransceiverDirection {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for WebRTCRTPTransceiverDirection {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for WebRTCRTPTransceiverDirection {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for WebRTCRTPTransceiverDirection {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for WebRTCRTPTransceiverDirection {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<WebRTCRTPTransceiverDirection>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1050,25 +1166,34 @@ impl StaticType for WebRTCSCTPTransportState {
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
-impl<'a> FromValueOptional<'a> for WebRTCSCTPTransportState {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for WebRTCSCTPTransportState {
+    type Type = Self;
 }
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
-impl<'a> FromValue<'a> for WebRTCSCTPTransportState {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for WebRTCSCTPTransportState {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
 #[cfg(any(feature = "v1_16", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_16")))]
-impl SetValue for WebRTCSCTPTransportState {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for WebRTCSCTPTransportState {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<WebRTCSCTPTransportState>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1144,21 +1269,30 @@ impl StaticType for WebRTCSDPType {
     }
 }
 
-impl<'a> FromValueOptional<'a> for WebRTCSDPType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for WebRTCSDPType {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for WebRTCSDPType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for WebRTCSDPType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for WebRTCSDPType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for WebRTCSDPType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<WebRTCSDPType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1229,21 +1363,30 @@ impl StaticType for WebRTCSignalingState {
     }
 }
 
-impl<'a> FromValueOptional<'a> for WebRTCSignalingState {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for WebRTCSignalingState {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for WebRTCSignalingState {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for WebRTCSignalingState {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for WebRTCSignalingState {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for WebRTCSignalingState {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<WebRTCSignalingState>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1338,20 +1481,29 @@ impl StaticType for WebRTCStatsType {
     }
 }
 
-impl<'a> FromValueOptional<'a> for WebRTCStatsType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for WebRTCStatsType {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for WebRTCStatsType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for WebRTCStatsType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for WebRTCStatsType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for WebRTCStatsType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<WebRTCStatsType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
diff --git a/gstreamer-webrtc/src/auto/versions.txt b/gstreamer-webrtc/src/auto/versions.txt
index cb68ef35f..a08888cb1 100644
--- a/gstreamer-webrtc/src/auto/versions.txt
+++ b/gstreamer-webrtc/src/auto/versions.txt
@@ -1,3 +1,3 @@
-Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
diff --git a/gstreamer-webrtc/src/auto/web_rtc_data_channel.rs b/gstreamer-webrtc/src/auto/web_rtc_data_channel.rs
index ba875322f..e8216cd6b 100644
--- a/gstreamer-webrtc/src/auto/web_rtc_data_channel.rs
+++ b/gstreamer-webrtc/src/auto/web_rtc_data_channel.rs
@@ -11,6 +11,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -97,7 +98,6 @@ impl WebRTCDataChannel {
             value
                 .get()
                 .expect("Return Value for property `buffered-amount` getter")
-                .unwrap()
         }
     }
 
@@ -113,7 +113,6 @@ impl WebRTCDataChannel {
             value
                 .get()
                 .expect("Return Value for property `buffered-amount-low-threshold` getter")
-                .unwrap()
         }
     }
 
@@ -123,9 +122,7 @@ impl WebRTCDataChannel {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"buffered-amount-low-threshold\0".as_ptr() as *const _,
-                glib::Value::from(&buffered_amount_low_threshold)
-                    .to_glib_none()
-                    .0,
+                buffered_amount_low_threshold.to_value().to_glib_none().0,
             );
         }
     }
@@ -139,10 +136,7 @@ impl WebRTCDataChannel {
                 b"id\0".as_ptr() as *const _,
                 value.to_glib_none_mut().0,
             );
-            value
-                .get()
-                .expect("Return Value for property `id` getter")
-                .unwrap()
+            value.get().expect("Return Value for property `id` getter")
         }
     }
 
@@ -173,7 +167,6 @@ impl WebRTCDataChannel {
             value
                 .get()
                 .expect("Return Value for property `max-packet-lifetime` getter")
-                .unwrap()
         }
     }
 
@@ -189,7 +182,6 @@ impl WebRTCDataChannel {
             value
                 .get()
                 .expect("Return Value for property `max-retransmits` getter")
-                .unwrap()
         }
     }
 
@@ -205,7 +197,6 @@ impl WebRTCDataChannel {
             value
                 .get()
                 .expect("Return Value for property `negotiated` getter")
-                .unwrap()
         }
     }
 
@@ -221,7 +212,6 @@ impl WebRTCDataChannel {
             value
                 .get()
                 .expect("Return Value for property `ordered` getter")
-                .unwrap()
         }
     }
 
@@ -238,7 +228,6 @@ impl WebRTCDataChannel {
             value
                 .get()
                 .expect("Return Value for property `priority` getter")
-                .unwrap()
         }
     }
 
@@ -270,7 +259,6 @@ impl WebRTCDataChannel {
             value
                 .get()
                 .expect("Return Value for property `ready-state` getter")
-                .unwrap()
         }
     }
 
diff --git a/gstreamer-webrtc/src/auto/web_rtcdtls_transport.rs b/gstreamer-webrtc/src/auto/web_rtcdtls_transport.rs
index 23949eaf3..e3130c50b 100644
--- a/gstreamer-webrtc/src/auto/web_rtcdtls_transport.rs
+++ b/gstreamer-webrtc/src/auto/web_rtcdtls_transport.rs
@@ -10,6 +10,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -64,7 +65,7 @@ impl WebRTCDTLSTransport {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"certificate\0".as_ptr() as *const _,
-                glib::Value::from(certificate).to_glib_none().0,
+                certificate.to_value().to_glib_none().0,
             );
         }
     }
@@ -81,7 +82,6 @@ impl WebRTCDTLSTransport {
             value
                 .get()
                 .expect("Return Value for property `client` getter")
-                .unwrap()
         }
     }
 
@@ -91,7 +91,7 @@ impl WebRTCDTLSTransport {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"client\0".as_ptr() as *const _,
-                glib::Value::from(&client).to_glib_none().0,
+                client.to_value().to_glib_none().0,
             );
         }
     }
@@ -123,7 +123,6 @@ impl WebRTCDTLSTransport {
             value
                 .get()
                 .expect("Return Value for property `rtcp` getter")
-                .unwrap()
         }
     }
 
@@ -139,7 +138,6 @@ impl WebRTCDTLSTransport {
             value
                 .get()
                 .expect("Return Value for property `session-id` getter")
-                .unwrap()
         }
     }
 
@@ -156,7 +154,6 @@ impl WebRTCDTLSTransport {
             value
                 .get()
                 .expect("Return Value for property `state` getter")
-                .unwrap()
         }
     }
 
diff --git a/gstreamer-webrtc/src/auto/web_rtcice_transport.rs b/gstreamer-webrtc/src/auto/web_rtcice_transport.rs
index d07b495fb..86c82e0b4 100644
--- a/gstreamer-webrtc/src/auto/web_rtcice_transport.rs
+++ b/gstreamer-webrtc/src/auto/web_rtcice_transport.rs
@@ -11,6 +11,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -75,7 +76,6 @@ impl WebRTCICETransport {
             value
                 .get()
                 .expect("Return Value for property `component` getter")
-                .unwrap()
         }
     }
 
@@ -92,7 +92,6 @@ impl WebRTCICETransport {
             value
                 .get()
                 .expect("Return Value for property `gathering-state` getter")
-                .unwrap()
         }
     }
 
@@ -109,7 +108,6 @@ impl WebRTCICETransport {
             value
                 .get()
                 .expect("Return Value for property `state` getter")
-                .unwrap()
         }
     }
 
diff --git a/gstreamer-webrtc/src/auto/web_rtcrtp_transceiver.rs b/gstreamer-webrtc/src/auto/web_rtcrtp_transceiver.rs
index 864e101b6..5ac8640e8 100644
--- a/gstreamer-webrtc/src/auto/web_rtcrtp_transceiver.rs
+++ b/gstreamer-webrtc/src/auto/web_rtcrtp_transceiver.rs
@@ -17,6 +17,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 #[cfg(any(feature = "v1_18", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_18")))]
 use std::boxed::Box as Box_;
@@ -49,7 +50,6 @@ impl WebRTCRTPTransceiver {
             value
                 .get()
                 .expect("Return Value for property `direction` getter")
-                .unwrap()
         }
     }
 
@@ -61,7 +61,7 @@ impl WebRTCRTPTransceiver {
             glib::gobject_ffi::g_object_set_property(
                 self.as_ptr() as *mut glib::gobject_ffi::GObject,
                 b"direction\0".as_ptr() as *const _,
-                glib::Value::from(&direction).to_glib_none().0,
+                direction.to_value().to_glib_none().0,
             );
         }
     }
@@ -78,7 +78,6 @@ impl WebRTCRTPTransceiver {
             value
                 .get()
                 .expect("Return Value for property `mlineindex` getter")
-                .unwrap()
         }
     }
 
diff --git a/gstreamer-webrtc/sys/build.rs b/gstreamer-webrtc/sys/build.rs
index 4a1611df2..7831eedbf 100644
--- a/gstreamer-webrtc/sys/build.rs
+++ b/gstreamer-webrtc/sys/build.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-webrtc/sys/src/lib.rs b/gstreamer-webrtc/sys/src/lib.rs
index dbad32e10..7f51f0bf2 100644
--- a/gstreamer-webrtc/sys/src/lib.rs
+++ b/gstreamer-webrtc/sys/src/lib.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-webrtc/sys/tests/abi.rs b/gstreamer-webrtc/sys/tests/abi.rs
index 0e9c62774..3243beecf 100644
--- a/gstreamer-webrtc/sys/tests/abi.rs
+++ b/gstreamer-webrtc/sys/tests/abi.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-webrtc/sys/tests/constant.c b/gstreamer-webrtc/sys/tests/constant.c
index b74e36e17..0d08917e1 100644
--- a/gstreamer-webrtc/sys/tests/constant.c
+++ b/gstreamer-webrtc/sys/tests/constant.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer-webrtc/sys/tests/layout.c b/gstreamer-webrtc/sys/tests/layout.c
index 493a6f619..91bdfb8d5 100644
--- a/gstreamer-webrtc/sys/tests/layout.c
+++ b/gstreamer-webrtc/sys/tests/layout.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer/src/auto/bin.rs b/gstreamer/src/auto/bin.rs
index 4bee7aa68..fbb2ce8d6 100644
--- a/gstreamer/src/auto/bin.rs
+++ b/gstreamer/src/auto/bin.rs
@@ -17,6 +17,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -298,7 +299,6 @@ impl<O: IsA<Bin>> GstBinExt for O {
             value
                 .get()
                 .expect("Return Value for property `async-handling` getter")
-                .unwrap()
         }
     }
 
@@ -307,7 +307,7 @@ impl<O: IsA<Bin>> GstBinExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"async-handling\0".as_ptr() as *const _,
-                glib::Value::from(&async_handling).to_glib_none().0,
+                async_handling.to_value().to_glib_none().0,
             );
         }
     }
@@ -323,7 +323,6 @@ impl<O: IsA<Bin>> GstBinExt for O {
             value
                 .get()
                 .expect("Return Value for property `message-forward` getter")
-                .unwrap()
         }
     }
 
@@ -332,7 +331,7 @@ impl<O: IsA<Bin>> GstBinExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"message-forward\0".as_ptr() as *const _,
-                glib::Value::from(&message_forward).to_glib_none().0,
+                message_forward.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer/src/auto/clock.rs b/gstreamer/src/auto/clock.rs
index 900c9ead2..088d887e8 100644
--- a/gstreamer/src/auto/clock.rs
+++ b/gstreamer/src/auto/clock.rs
@@ -11,6 +11,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem;
 use std::mem::transmute;
@@ -405,7 +406,6 @@ impl<O: IsA<Clock>> ClockExt for O {
             value
                 .get()
                 .expect("Return Value for property `window-size` getter")
-                .unwrap()
         }
     }
 
@@ -414,7 +414,7 @@ impl<O: IsA<Clock>> ClockExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"window-size\0".as_ptr() as *const _,
-                glib::Value::from(&window_size).to_glib_none().0,
+                window_size.to_value().to_glib_none().0,
             );
         }
     }
@@ -430,7 +430,6 @@ impl<O: IsA<Clock>> ClockExt for O {
             value
                 .get()
                 .expect("Return Value for property `window-threshold` getter")
-                .unwrap()
         }
     }
 
@@ -439,7 +438,7 @@ impl<O: IsA<Clock>> ClockExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"window-threshold\0".as_ptr() as *const _,
-                glib::Value::from(&window_threshold).to_glib_none().0,
+                window_threshold.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer/src/auto/control_binding.rs b/gstreamer/src/auto/control_binding.rs
index 813237d59..6720960d1 100644
--- a/gstreamer/src/auto/control_binding.rs
+++ b/gstreamer/src/auto/control_binding.rs
@@ -8,6 +8,7 @@ use crate::Object;
 use glib::object::IsA;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 
 glib::wrapper! {
     pub struct ControlBinding(Object<ffi::GstControlBinding, ffi::GstControlBindingClass>) @extends Object;
diff --git a/gstreamer/src/auto/device_monitor.rs b/gstreamer/src/auto/device_monitor.rs
index d05889e24..297981a90 100644
--- a/gstreamer/src/auto/device_monitor.rs
+++ b/gstreamer/src/auto/device_monitor.rs
@@ -12,6 +12,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -130,7 +131,6 @@ impl<O: IsA<DeviceMonitor>> DeviceMonitorExt for O {
             value
                 .get()
                 .expect("Return Value for property `show-all` getter")
-                .unwrap()
         }
     }
 
@@ -139,7 +139,7 @@ impl<O: IsA<DeviceMonitor>> DeviceMonitorExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"show-all\0".as_ptr() as *const _,
-                glib::Value::from(&show_all).to_glib_none().0,
+                show_all.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer/src/auto/enums.rs b/gstreamer/src/auto/enums.rs
index 432b82e05..8b842b2c0 100644
--- a/gstreamer/src/auto/enums.rs
+++ b/gstreamer/src/auto/enums.rs
@@ -7,8 +7,7 @@ use crate::EventTypeFlags;
 use glib::error::ErrorDomain;
 use glib::translate::*;
 use glib::value::FromValue;
-use glib::value::FromValueOptional;
-use glib::value::SetValue;
+use glib::value::ToValue;
 use glib::Quark;
 use glib::StaticType;
 use glib::Type;
@@ -66,21 +65,30 @@ impl StaticType for BufferingMode {
     }
 }
 
-impl<'a> FromValueOptional<'a> for BufferingMode {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for BufferingMode {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for BufferingMode {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for BufferingMode {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for BufferingMode {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for BufferingMode {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<BufferingMode>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -131,21 +139,30 @@ impl StaticType for BusSyncReply {
     }
 }
 
-impl<'a> FromValueOptional<'a> for BusSyncReply {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for BusSyncReply {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for BusSyncReply {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for BusSyncReply {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for BusSyncReply {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for BusSyncReply {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<BusSyncReply>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -192,21 +209,30 @@ impl StaticType for CapsIntersectMode {
     }
 }
 
-impl<'a> FromValueOptional<'a> for CapsIntersectMode {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for CapsIntersectMode {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for CapsIntersectMode {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for CapsIntersectMode {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for CapsIntersectMode {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for CapsIntersectMode {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<CapsIntersectMode>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -253,21 +279,30 @@ impl StaticType for ClockEntryType {
     }
 }
 
-impl<'a> FromValueOptional<'a> for ClockEntryType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for ClockEntryType {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for ClockEntryType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for ClockEntryType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for ClockEntryType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for ClockEntryType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<ClockEntryType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -339,21 +374,30 @@ impl StaticType for ClockReturn {
     }
 }
 
-impl<'a> FromValueOptional<'a> for ClockReturn {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for ClockReturn {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for ClockReturn {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for ClockReturn {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for ClockReturn {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for ClockReturn {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<ClockReturn>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -412,21 +456,30 @@ impl StaticType for ClockType {
     }
 }
 
-impl<'a> FromValueOptional<'a> for ClockType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for ClockType {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for ClockType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for ClockType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for ClockType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for ClockType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<ClockType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -559,21 +612,30 @@ impl StaticType for CoreError {
     }
 }
 
-impl<'a> FromValueOptional<'a> for CoreError {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for CoreError {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for CoreError {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for CoreError {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for CoreError {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for CoreError {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<CoreError>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -673,21 +735,30 @@ impl StaticType for DebugLevel {
     }
 }
 
-impl<'a> FromValueOptional<'a> for DebugLevel {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for DebugLevel {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for DebugLevel {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for DebugLevel {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for DebugLevel {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for DebugLevel {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<DebugLevel>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -903,21 +974,30 @@ impl StaticType for EventType {
     }
 }
 
-impl<'a> FromValueOptional<'a> for EventType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for EventType {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for EventType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for EventType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for EventType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for EventType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<EventType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1009,21 +1089,30 @@ impl StaticType for FlowReturn {
     }
 }
 
-impl<'a> FromValueOptional<'a> for FlowReturn {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for FlowReturn {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for FlowReturn {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for FlowReturn {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for FlowReturn {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for FlowReturn {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<FlowReturn>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1117,21 +1206,30 @@ impl StaticType for Format {
     }
 }
 
-impl<'a> FromValueOptional<'a> for Format {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for Format {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for Format {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for Format {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for Format {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for Format {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<Format>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1224,21 +1322,30 @@ impl StaticType for LibraryError {
     }
 }
 
-impl<'a> FromValueOptional<'a> for LibraryError {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for LibraryError {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for LibraryError {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for LibraryError {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for LibraryError {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for LibraryError {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<LibraryError>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1289,21 +1396,30 @@ impl StaticType for PadDirection {
     }
 }
 
-impl<'a> FromValueOptional<'a> for PadDirection {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for PadDirection {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for PadDirection {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for PadDirection {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for PadDirection {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for PadDirection {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<PadDirection>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1371,21 +1487,30 @@ impl StaticType for PadLinkReturn {
     }
 }
 
-impl<'a> FromValueOptional<'a> for PadLinkReturn {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for PadLinkReturn {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for PadLinkReturn {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for PadLinkReturn {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for PadLinkReturn {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for PadLinkReturn {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<PadLinkReturn>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1457,21 +1582,30 @@ impl StaticType for PadMode {
     }
 }
 
-impl<'a> FromValueOptional<'a> for PadMode {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for PadMode {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for PadMode {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for PadMode {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for PadMode {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for PadMode {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<PadMode>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1522,21 +1656,30 @@ impl StaticType for PadPresence {
     }
 }
 
-impl<'a> FromValueOptional<'a> for PadPresence {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for PadPresence {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for PadPresence {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for PadPresence {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for PadPresence {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for PadPresence {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<PadPresence>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1595,21 +1738,30 @@ impl StaticType for PadProbeReturn {
     }
 }
 
-impl<'a> FromValueOptional<'a> for PadProbeReturn {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for PadProbeReturn {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for PadProbeReturn {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for PadProbeReturn {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for PadProbeReturn {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for PadProbeReturn {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<PadProbeReturn>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1707,21 +1859,30 @@ impl StaticType for ParseError {
     }
 }
 
-impl<'a> FromValueOptional<'a> for ParseError {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for ParseError {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for ParseError {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for ParseError {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for ParseError {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for ParseError {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<ParseError>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1794,21 +1955,30 @@ impl StaticType for PluginError {
     }
 }
 
-impl<'a> FromValueOptional<'a> for PluginError {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for PluginError {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for PluginError {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for PluginError {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for PluginError {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for PluginError {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<PluginError>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1867,21 +2037,30 @@ impl StaticType for ProgressType {
     }
 }
 
-impl<'a> FromValueOptional<'a> for ProgressType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for ProgressType {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for ProgressType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for ProgressType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for ProgressType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for ProgressType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<ProgressType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1946,25 +2125,34 @@ impl StaticType for PromiseResult {
 
 #[cfg(any(feature = "v1_14", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_14")))]
-impl<'a> FromValueOptional<'a> for PromiseResult {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for PromiseResult {
+    type Type = Self;
 }
 
 #[cfg(any(feature = "v1_14", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_14")))]
-impl<'a> FromValue<'a> for PromiseResult {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for PromiseResult {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
 #[cfg(any(feature = "v1_14", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_14")))]
-impl SetValue for PromiseResult {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for PromiseResult {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<PromiseResult>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -2015,21 +2203,30 @@ impl StaticType for QOSType {
     }
 }
 
-impl<'a> FromValueOptional<'a> for QOSType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for QOSType {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for QOSType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for QOSType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for QOSType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for QOSType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<QOSType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -2084,21 +2281,30 @@ impl StaticType for Rank {
     }
 }
 
-impl<'a> FromValueOptional<'a> for Rank {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for Rank {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for Rank {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for Rank {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for Rank {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for Rank {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<Rank>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -2236,21 +2442,30 @@ impl StaticType for ResourceError {
     }
 }
 
-impl<'a> FromValueOptional<'a> for ResourceError {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for ResourceError {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for ResourceError {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for ResourceError {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for ResourceError {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for ResourceError {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<ResourceError>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -2301,21 +2516,30 @@ impl StaticType for SeekType {
     }
 }
 
-impl<'a> FromValueOptional<'a> for SeekType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for SeekType {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for SeekType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for SeekType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for SeekType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for SeekType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<SeekType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -2374,21 +2598,30 @@ impl StaticType for State {
     }
 }
 
-impl<'a> FromValueOptional<'a> for State {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for State {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for State {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for State {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for State {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for State {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<State>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -2474,21 +2707,30 @@ impl StaticType for StateChange {
     }
 }
 
-impl<'a> FromValueOptional<'a> for StateChange {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for StateChange {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for StateChange {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for StateChange {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for StateChange {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for StateChange {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<StateChange>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -2544,21 +2786,30 @@ impl StaticType for StateChangeReturn {
     }
 }
 
-impl<'a> FromValueOptional<'a> for StateChangeReturn {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for StateChangeReturn {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for StateChangeReturn {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for StateChangeReturn {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for StateChangeReturn {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for StateChangeReturn {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<StateChangeReturn>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -2686,21 +2937,30 @@ impl StaticType for StreamError {
     }
 }
 
-impl<'a> FromValueOptional<'a> for StreamError {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for StreamError {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for StreamError {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for StreamError {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for StreamError {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for StreamError {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<StreamError>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -2767,21 +3027,30 @@ impl StaticType for StreamStatusType {
     }
 }
 
-impl<'a> FromValueOptional<'a> for StreamStatusType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for StreamStatusType {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for StreamStatusType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for StreamStatusType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for StreamStatusType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for StreamStatusType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<StreamStatusType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -2828,21 +3097,30 @@ impl StaticType for StructureChangeType {
     }
 }
 
-impl<'a> FromValueOptional<'a> for StructureChangeType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for StructureChangeType {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for StructureChangeType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for StructureChangeType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for StructureChangeType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for StructureChangeType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<StructureChangeType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -2901,21 +3179,30 @@ impl StaticType for TagFlag {
     }
 }
 
-impl<'a> FromValueOptional<'a> for TagFlag {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for TagFlag {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for TagFlag {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for TagFlag {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for TagFlag {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for TagFlag {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<TagFlag>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -2986,21 +3273,30 @@ impl StaticType for TagMergeMode {
     }
 }
 
-impl<'a> FromValueOptional<'a> for TagMergeMode {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for TagMergeMode {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for TagMergeMode {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for TagMergeMode {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for TagMergeMode {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for TagMergeMode {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<TagMergeMode>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -3048,21 +3344,30 @@ impl StaticType for TagScope {
     }
 }
 
-impl<'a> FromValueOptional<'a> for TagScope {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for TagScope {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for TagScope {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for TagScope {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for TagScope {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for TagScope {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<TagScope>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -3113,21 +3418,30 @@ impl StaticType for TaskState {
     }
 }
 
-impl<'a> FromValueOptional<'a> for TaskState {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for TaskState {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for TaskState {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for TaskState {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for TaskState {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for TaskState {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<TaskState>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -3209,21 +3523,30 @@ impl StaticType for TocEntryType {
     }
 }
 
-impl<'a> FromValueOptional<'a> for TocEntryType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for TocEntryType {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for TocEntryType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for TocEntryType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for TocEntryType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for TocEntryType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<TocEntryType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -3279,21 +3602,30 @@ impl StaticType for TocLoopType {
     }
 }
 
-impl<'a> FromValueOptional<'a> for TocLoopType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for TocLoopType {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for TocLoopType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for TocLoopType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for TocLoopType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for TocLoopType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<TocLoopType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -3341,21 +3673,30 @@ impl StaticType for TocScope {
     }
 }
 
-impl<'a> FromValueOptional<'a> for TocScope {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for TocScope {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for TocScope {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for TocScope {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for TocScope {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for TocScope {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<TocScope>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -3418,21 +3759,30 @@ impl StaticType for TypeFindProbability {
     }
 }
 
-impl<'a> FromValueOptional<'a> for TypeFindProbability {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for TypeFindProbability {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for TypeFindProbability {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for TypeFindProbability {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for TypeFindProbability {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for TypeFindProbability {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<TypeFindProbability>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -3510,21 +3860,30 @@ impl StaticType for URIError {
     }
 }
 
-impl<'a> FromValueOptional<'a> for URIError {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for URIError {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for URIError {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for URIError {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for URIError {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for URIError {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<URIError>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -3575,20 +3934,29 @@ impl StaticType for URIType {
     }
 }
 
-impl<'a> FromValueOptional<'a> for URIType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for URIType {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for URIType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for URIType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_enum(value.to_glib_none().0))
     }
 }
 
-impl SetValue for URIType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for URIType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<URIType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_enum(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
diff --git a/gstreamer/src/auto/flags.rs b/gstreamer/src/auto/flags.rs
index 687566bf1..fb0249bd0 100644
--- a/gstreamer/src/auto/flags.rs
+++ b/gstreamer/src/auto/flags.rs
@@ -6,8 +6,7 @@
 use bitflags::bitflags;
 use glib::translate::*;
 use glib::value::FromValue;
-use glib::value::FromValueOptional;
-use glib::value::SetValue;
+use glib::value::ToValue;
 use glib::StaticType;
 use glib::Type;
 #[cfg(any(feature = "v1_10", feature = "dox"))]
@@ -49,21 +48,30 @@ impl StaticType for BinFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for BinFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for BinFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for BinFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for BinFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for BinFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for BinFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<BinFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -101,21 +109,30 @@ impl StaticType for BufferCopyFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for BufferCopyFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for BufferCopyFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for BufferCopyFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for BufferCopyFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for BufferCopyFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for BufferCopyFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<BufferCopyFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -163,21 +180,30 @@ impl StaticType for BufferFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for BufferFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for BufferFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for BufferFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for BufferFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for BufferFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for BufferFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<BufferFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -212,21 +238,30 @@ impl StaticType for BufferPoolAcquireFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for BufferPoolAcquireFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for BufferPoolAcquireFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for BufferPoolAcquireFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for BufferPoolAcquireFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for BufferPoolAcquireFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for BufferPoolAcquireFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<BufferPoolAcquireFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -265,21 +300,30 @@ impl StaticType for ClockFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for ClockFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for ClockFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for ClockFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for ClockFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for ClockFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for ClockFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<ClockFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -329,21 +373,30 @@ impl StaticType for DebugColorFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for DebugColorFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for DebugColorFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for DebugColorFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for DebugColorFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for DebugColorFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for DebugColorFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<DebugColorFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -382,21 +435,30 @@ impl StaticType for DebugGraphDetails {
     }
 }
 
-impl<'a> FromValueOptional<'a> for DebugGraphDetails {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for DebugGraphDetails {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for DebugGraphDetails {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for DebugGraphDetails {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for DebugGraphDetails {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for DebugGraphDetails {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<DebugGraphDetails>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -434,21 +496,30 @@ impl StaticType for ElementFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for ElementFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for ElementFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for ElementFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for ElementFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for ElementFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for ElementFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<ElementFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -485,21 +556,30 @@ impl StaticType for EventTypeFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for EventTypeFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for EventTypeFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for EventTypeFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for EventTypeFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for EventTypeFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for EventTypeFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<EventTypeFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -537,21 +617,30 @@ impl StaticType for MemoryFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for MemoryFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for MemoryFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for MemoryFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for MemoryFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for MemoryFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for MemoryFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<MemoryFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -586,21 +675,30 @@ impl StaticType for ObjectFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for ObjectFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for ObjectFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for ObjectFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for ObjectFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for ObjectFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for ObjectFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<ObjectFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -645,21 +743,30 @@ impl StaticType for PadFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for PadFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for PadFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for PadFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for PadFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for PadFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for PadFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<PadFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -696,21 +803,30 @@ impl StaticType for PadLinkCheck {
     }
 }
 
-impl<'a> FromValueOptional<'a> for PadLinkCheck {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for PadLinkCheck {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for PadLinkCheck {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for PadLinkCheck {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for PadLinkCheck {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for PadLinkCheck {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<PadLinkCheck>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -763,21 +879,30 @@ impl StaticType for PadProbeType {
     }
 }
 
-impl<'a> FromValueOptional<'a> for PadProbeType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for PadProbeType {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for PadProbeType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for PadProbeType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for PadProbeType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for PadProbeType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<PadProbeType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -814,21 +939,30 @@ impl StaticType for ParseFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for ParseFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for ParseFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for ParseFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for ParseFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for ParseFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for ParseFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<ParseFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -861,21 +995,30 @@ impl StaticType for PipelineFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for PipelineFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for PipelineFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for PipelineFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for PipelineFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for PipelineFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for PipelineFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<PipelineFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -918,25 +1061,34 @@ impl StaticType for PluginAPIFlags {
 
 #[cfg(any(feature = "v1_18", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_18")))]
-impl<'a> FromValueOptional<'a> for PluginAPIFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for PluginAPIFlags {
+    type Type = Self;
 }
 
 #[cfg(any(feature = "v1_18", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_18")))]
-impl<'a> FromValue<'a> for PluginAPIFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for PluginAPIFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
 #[cfg(any(feature = "v1_18", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_18")))]
-impl SetValue for PluginAPIFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for PluginAPIFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<PluginAPIFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -973,21 +1125,30 @@ impl StaticType for PluginDependencyFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for PluginDependencyFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for PluginDependencyFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for PluginDependencyFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for PluginDependencyFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for PluginDependencyFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for PluginDependencyFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<PluginDependencyFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1021,21 +1182,30 @@ impl StaticType for PluginFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for PluginFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for PluginFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for PluginFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for PluginFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for PluginFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for PluginFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<PluginFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1070,21 +1240,30 @@ impl StaticType for SchedulingFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for SchedulingFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for SchedulingFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for SchedulingFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for SchedulingFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for SchedulingFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for SchedulingFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<SchedulingFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1133,21 +1312,30 @@ impl StaticType for SeekFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for SeekFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for SeekFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for SeekFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for SeekFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for SeekFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for SeekFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<SeekFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1189,21 +1377,30 @@ impl StaticType for SegmentFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for SegmentFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for SegmentFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for SegmentFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for SegmentFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for SegmentFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for SegmentFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<SegmentFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1246,25 +1443,34 @@ impl StaticType for StackTraceFlags {
 
 #[cfg(any(feature = "v1_12", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_12")))]
-impl<'a> FromValueOptional<'a> for StackTraceFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for StackTraceFlags {
+    type Type = Self;
 }
 
 #[cfg(any(feature = "v1_12", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_12")))]
-impl<'a> FromValue<'a> for StackTraceFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for StackTraceFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
 #[cfg(any(feature = "v1_12", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_12")))]
-impl SetValue for StackTraceFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for StackTraceFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<StackTraceFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1299,21 +1505,30 @@ impl StaticType for StreamFlags {
     }
 }
 
-impl<'a> FromValueOptional<'a> for StreamFlags {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for StreamFlags {
+    type Type = Self;
 }
 
-impl<'a> FromValue<'a> for StreamFlags {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for StreamFlags {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
-impl SetValue for StreamFlags {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for StreamFlags {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<StreamFlags>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
 
@@ -1385,24 +1600,33 @@ impl StaticType for StreamType {
 
 #[cfg(any(feature = "v1_10", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_10")))]
-impl<'a> FromValueOptional<'a> for StreamType {
-    unsafe fn from_value_optional(value: &glib::Value) -> Option<Self> {
-        Some(FromValue::from_value(value))
-    }
+impl glib::value::ValueType for StreamType {
+    type Type = Self;
 }
 
 #[cfg(any(feature = "v1_10", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_10")))]
-impl<'a> FromValue<'a> for StreamType {
-    unsafe fn from_value(value: &glib::Value) -> Self {
+unsafe impl<'a> FromValue<'a> for StreamType {
+    type Checker = glib::value::GenericValueTypeChecker<Self>;
+
+    unsafe fn from_value(value: &'a glib::Value) -> Self {
+        skip_assert_initialized!();
         from_glib(glib::gobject_ffi::g_value_get_flags(value.to_glib_none().0))
     }
 }
 
 #[cfg(any(feature = "v1_10", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_10")))]
-impl SetValue for StreamType {
-    unsafe fn set_value(value: &mut glib::Value, this: &Self) {
-        glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, this.to_glib())
+impl ToValue for StreamType {
+    fn to_value(&self) -> glib::Value {
+        let mut value = glib::Value::for_value_type::<StreamType>();
+        unsafe {
+            glib::gobject_ffi::g_value_set_flags(value.to_glib_none_mut().0, self.to_glib());
+        }
+        value
+    }
+
+    fn value_type(&self) -> glib::Type {
+        Self::static_type()
     }
 }
diff --git a/gstreamer/src/auto/pad.rs b/gstreamer/src/auto/pad.rs
index 55ae97bf1..6589721b8 100644
--- a/gstreamer/src/auto/pad.rs
+++ b/gstreamer/src/auto/pad.rs
@@ -26,6 +26,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
diff --git a/gstreamer/src/auto/pad_template.rs b/gstreamer/src/auto/pad_template.rs
index c58962cc7..35ec03dbb 100644
--- a/gstreamer/src/auto/pad_template.rs
+++ b/gstreamer/src/auto/pad_template.rs
@@ -14,6 +14,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -115,7 +116,6 @@ impl PadTemplate {
             value
                 .get()
                 .expect("Return Value for property `direction` getter")
-                .unwrap()
         }
     }
 
@@ -134,7 +134,6 @@ impl PadTemplate {
             value
                 .get()
                 .expect("Return Value for property `gtype` getter")
-                .unwrap()
         }
     }
 
@@ -165,7 +164,6 @@ impl PadTemplate {
             value
                 .get()
                 .expect("Return Value for property `presence` getter")
-                .unwrap()
         }
     }
 
diff --git a/gstreamer/src/auto/system_clock.rs b/gstreamer/src/auto/system_clock.rs
index 322feee51..7d60724ae 100644
--- a/gstreamer/src/auto/system_clock.rs
+++ b/gstreamer/src/auto/system_clock.rs
@@ -12,6 +12,7 @@ use glib::signal::connect_raw;
 use glib::signal::SignalHandlerId;
 use glib::translate::*;
 use glib::StaticType;
+use glib::ToValue;
 use std::boxed::Box as Box_;
 use std::mem::transmute;
 
@@ -69,7 +70,6 @@ impl<O: IsA<SystemClock>> SystemClockExt for O {
             value
                 .get()
                 .expect("Return Value for property `clock-type` getter")
-                .unwrap()
         }
     }
 
@@ -78,7 +78,7 @@ impl<O: IsA<SystemClock>> SystemClockExt for O {
             glib::gobject_ffi::g_object_set_property(
                 self.to_glib_none().0 as *mut glib::gobject_ffi::GObject,
                 b"clock-type\0".as_ptr() as *const _,
-                glib::Value::from(&clock_type).to_glib_none().0,
+                clock_type.to_value().to_glib_none().0,
             );
         }
     }
diff --git a/gstreamer/src/auto/versions.txt b/gstreamer/src/auto/versions.txt
index cb68ef35f..a08888cb1 100644
--- a/gstreamer/src/auto/versions.txt
+++ b/gstreamer/src/auto/versions.txt
@@ -1,3 +1,3 @@
-Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
diff --git a/gstreamer/sys/build.rs b/gstreamer/sys/build.rs
index 4a1611df2..7831eedbf 100644
--- a/gstreamer/sys/build.rs
+++ b/gstreamer/sys/build.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer/sys/src/lib.rs b/gstreamer/sys/src/lib.rs
index c4d219fe7..f2677808b 100644
--- a/gstreamer/sys/src/lib.rs
+++ b/gstreamer/sys/src/lib.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer/sys/tests/abi.rs b/gstreamer/sys/tests/abi.rs
index 3e1f21a36..fa94c103a 100644
--- a/gstreamer/sys/tests/abi.rs
+++ b/gstreamer/sys/tests/abi.rs
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer/sys/tests/constant.c b/gstreamer/sys/tests/constant.c
index 38858758c..2266197f9 100644
--- a/gstreamer/sys/tests/constant.c
+++ b/gstreamer/sys/tests/constant.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT
diff --git a/gstreamer/sys/tests/layout.c b/gstreamer/sys/tests/layout.c
index bac32c38f..43de0cdae 100644
--- a/gstreamer/sys/tests/layout.c
+++ b/gstreamer/sys/tests/layout.c
@@ -1,4 +1,4 @@
-// Generated by gir (https://github.com/gtk-rs/gir @ a972bd6)
+// Generated by gir (https://github.com/gtk-rs/gir @ a01a90f)
 // from gir-files (https://github.com/gtk-rs/gir-files @ 6088bb6)
 // from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git @ 208138a)
 // DO NOT EDIT