gstreamer: format: Implement some more conversion traits

Specifically, `From<$formatted_type> for $inner` and
`TryFrom<$formatted_type> for usize` for some types.

Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/issues/492

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1329>

gstreamer/src/format/generic.rs

@@ -74,6 +74,14 @@ impl TryFromGlib<i64> for Other {
     }
 }
 
+impl TryFrom<Other> for usize {
+    type Error = std::num::TryFromIntError;
+
+    fn try_from(value: Other) -> Result<Self, Self::Error> {
+        value.0.try_into()
+    }
+}
+
 // FIXME `functions in traits cannot be const` (rustc 1.64.0)
 // rustdoc-stripper-ignore-next
 /// `Other` formatted value constructor trait.

gstreamer/src/format/macros.rs

@@ -281,6 +281,12 @@ macro_rules! impl_common_ops_for_newtype_uint(
             }
         }
 
+        impl From<$typ> for $inner {
+            fn from(v: $typ) -> $inner {
+                v.0
+            }
+        }
+
         impl_trait_op_same!($typ, Add, add, AddAssign, add_assign);
         impl_trait_op_same!($typ, Sub, sub, SubAssign, sub_assign);
         impl std::ops::Div for $typ {

gstreamer/src/format/specific.rs

@@ -67,6 +67,14 @@ impl_format_value_traits!(Buffers, Buffers, Buffers, u64);
 option_glib_newtype_from_to!(Buffers, Buffers::OFFSET_NONE);
 glib_newtype_display!(Buffers, DisplayableOptionBuffers, Format::Buffers);
 
+impl TryFrom<Buffers> for usize {
+    type Error = std::num::TryFromIntError;
+
+    fn try_from(value: Buffers) -> Result<Self, Self::Error> {
+        value.0.try_into()
+    }
+}
+
 // FIXME `functions in traits cannot be const` (rustc 1.64.0)
 // rustdoc-stripper-ignore-next
 /// `Buffers` formatted value constructor trait.
@@ -143,6 +151,14 @@ impl_format_value_traits!(Bytes, Bytes, Bytes, u64);
 option_glib_newtype_from_to!(Bytes, u64::MAX);
 glib_newtype_display!(Bytes, DisplayableOptionBytes, Format::Bytes);
 
+impl TryFrom<Bytes> for usize {
+    type Error = std::num::TryFromIntError;
+
+    fn try_from(value: Bytes) -> Result<Self, Self::Error> {
+        value.0.try_into()
+    }
+}
+
 // FIXME `functions in traits cannot be const` (rustc 1.64.0)
 // rustdoc-stripper-ignore-next
 /// `Bytes` formatted value constructor trait.
@@ -240,6 +256,14 @@ impl_format_value_traits!(Default, Default, Default, u64);
 option_glib_newtype_from_to!(Default, u64::MAX);
 glib_newtype_display!(Default, DisplayableOptionDefault, Format::Default);
 
+impl TryFrom<Default> for usize {
+    type Error = std::num::TryFromIntError;
+
+    fn try_from(value: Default) -> Result<Self, Self::Error> {
+        value.0.try_into()
+    }
+}
+
 // FIXME `functions in traits cannot be const` (rustc 1.64.0)
 // rustdoc-stripper-ignore-next
 /// `Default` formatted value constructor trait.