Seal manual traits

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1292>

gstreamer-audio/src/audio_aggregator.rs

@@ -10,33 +10,13 @@ use gst::prelude::*;
 
 use crate::auto::{AudioAggregator, AudioAggregatorPad};
 
-pub trait AudioAggregatorExtManual: 'static {
-    #[doc(alias = "gst_audio_aggregator_set_sink_caps")]
-    fn set_sink_caps(&self, pad: &impl IsA<AudioAggregatorPad>, caps: &gst::CapsRef);
-
-    #[cfg(feature = "v1_18")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
-    #[doc(alias = "output-buffer-duration-fraction")]
-    fn output_buffer_duration_fraction(&self) -> gst::Fraction;
-
-    #[cfg(feature = "v1_18")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
-    #[doc(alias = "output-buffer-duration-fraction")]
-    fn set_output_buffer_duration_fraction(&self, output_buffer_duration_fraction: gst::Fraction);
-
-    #[cfg(feature = "v1_18")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
-    #[doc(alias = "output-buffer-duration-fraction")]
-    fn connect_output_buffer_duration_fraction_notify<F: Fn(&Self) + Send + Sync + 'static>(
-        &self,
-        f: F,
-    ) -> SignalHandlerId;
-
-    fn current_caps(&self) -> Option<gst::Caps>;
-    fn current_audio_info(&self) -> Option<crate::AudioInfo>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::AudioAggregator>> Sealed for T {}
 }
 
-impl<O: IsA<AudioAggregator>> AudioAggregatorExtManual for O {
+pub trait AudioAggregatorExtManual: sealed::Sealed + IsA<AudioAggregator> + 'static {
+    #[doc(alias = "gst_audio_aggregator_set_sink_caps")]
     fn set_sink_caps(&self, pad: &impl IsA<AudioAggregatorPad>, caps: &gst::CapsRef) {
         unsafe {
             ffi::gst_audio_aggregator_set_sink_caps(
@@ -49,12 +29,14 @@ impl<O: IsA<AudioAggregator>> AudioAggregatorExtManual for O {
 
     #[cfg(feature = "v1_18")]
     #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
+    #[doc(alias = "output-buffer-duration-fraction")]
     fn output_buffer_duration_fraction(&self) -> gst::Fraction {
         glib::ObjectExt::property(self.as_ref(), "output-buffer-duration-fraction")
     }
 
     #[cfg(feature = "v1_18")]
     #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
+    #[doc(alias = "output-buffer-duration-fraction")]
     fn set_output_buffer_duration_fraction(&self, output_buffer_duration_fraction: gst::Fraction) {
         glib::ObjectExt::set_property(
             self.as_ref(),
@@ -65,6 +47,7 @@ impl<O: IsA<AudioAggregator>> AudioAggregatorExtManual for O {
 
     #[cfg(feature = "v1_18")]
     #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
+    #[doc(alias = "output-buffer-duration-fraction")]
     fn connect_output_buffer_duration_fraction_notify<F: Fn(&Self) + Send + Sync + 'static>(
         &self,
         f: F,
@@ -106,3 +89,5 @@ impl<O: IsA<AudioAggregator>> AudioAggregatorExtManual for O {
             .and_then(|caps| crate::AudioInfo::from_caps(&caps).ok())
     }
 }
+
+impl<O: IsA<AudioAggregator>> AudioAggregatorExtManual for O {}

gstreamer-audio/src/audio_aggregator_convert_pad.rs

@@ -9,26 +9,21 @@ use glib::{
 
 use crate::auto::AudioAggregatorConvertPad;
 
-pub trait AudioAggregatorConvertPadExtManual: 'static {
-    #[doc(alias = "converter-config")]
-    fn converter_config(&self) -> Option<crate::AudioConverterConfig>;
-
-    #[doc(alias = "converter-config")]
-    fn set_converter_config(&self, converter_config: Option<&crate::AudioConverterConfig>);
-
-    #[doc(alias = "converter-config")]
-    fn connect_converter_config_notify<F: Fn(&Self) + Send + Sync + 'static>(
-        &self,
-        f: F,
-    ) -> SignalHandlerId;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::AudioAggregatorConvertPad>> Sealed for T {}
 }
 
-impl<O: IsA<AudioAggregatorConvertPad>> AudioAggregatorConvertPadExtManual for O {
+pub trait AudioAggregatorConvertPadExtManual:
+    sealed::Sealed + IsA<AudioAggregatorConvertPad> + 'static
+{
+    #[doc(alias = "converter-config")]
     fn converter_config(&self) -> Option<crate::AudioConverterConfig> {
         glib::ObjectExt::property::<Option<gst::Structure>>(self.as_ref(), "converter-config")
             .map(|c| c.try_into().unwrap())
     }
 
+    #[doc(alias = "converter-config")]
     fn set_converter_config(&self, converter_config: Option<&crate::AudioConverterConfig>) {
         glib::ObjectExt::set_property(
             self.as_ref(),
@@ -37,6 +32,7 @@ impl<O: IsA<AudioAggregatorConvertPad>> AudioAggregatorConvertPadExtManual for O
         )
     }
 
+    #[doc(alias = "converter-config")]
     fn connect_converter_config_notify<F: Fn(&Self) + Send + Sync + 'static>(
         &self,
         f: F,
@@ -65,3 +61,5 @@ impl<O: IsA<AudioAggregatorConvertPad>> AudioAggregatorConvertPadExtManual for O
         }
     }
 }
+
+impl<O: IsA<AudioAggregatorConvertPad>> AudioAggregatorConvertPadExtManual for O {}

gstreamer-audio/src/audio_aggregator_pad.rs

@@ -3,11 +3,12 @@ use gst::prelude::*;
 
 use crate::auto::AudioAggregatorPad;
 
-pub trait AudioAggregatorPadExtManual: 'static {
-    fn audio_info(&self) -> Option<crate::AudioInfo>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::AudioAggregatorPad>> Sealed for T {}
 }
 
-impl<O: IsA<AudioAggregatorPad>> AudioAggregatorPadExtManual for O {
+pub trait AudioAggregatorPadExtManual: sealed::Sealed + IsA<AudioAggregatorPad> + 'static {
     fn audio_info(&self) -> Option<crate::AudioInfo> {
         unsafe {
             let ptr = self.as_ptr() as *mut ffi::GstAudioAggregatorPad;
@@ -25,3 +26,5 @@ impl<O: IsA<AudioAggregatorPad>> AudioAggregatorPadExtManual for O {
         }
     }
 }
+
+impl<O: IsA<AudioAggregatorPad>> AudioAggregatorPadExtManual for O {}

gstreamer-audio/src/audio_decoder.rs

@@ -20,36 +20,12 @@ extern "C" {
     ) -> gst::ffi::GstFlowReturn;
 }
 
-pub trait AudioDecoderExtManual: 'static {
-    fn negotiate(&self) -> Result<(), gst::FlowError>;
-
-    #[cfg(feature = "v1_16")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_16")))]
-    fn set_output_caps(&self, caps: &gst::Caps) -> Result<(), gst::FlowError>;
-
-    fn set_output_format(&self, info: &AudioInfo) -> Result<(), gst::FlowError>;
-
-    #[doc(alias = "get_allocator")]
-    fn allocator(&self) -> (Option<gst::Allocator>, gst::AllocationParams);
-
-    #[allow(clippy::too_many_arguments)]
-    fn error<T: gst::MessageErrorDomain>(
-        &self,
-        weight: i32,
-        code: T,
-        message: Option<&str>,
-        debug: Option<&str>,
-        file: &str,
-        function: &str,
-        line: u32,
-    ) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn sink_pad(&self) -> &gst::Pad;
-
-    fn src_pad(&self) -> &gst::Pad;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::AudioDecoder>> Sealed for T {}
 }
 
-impl<O: IsA<AudioDecoder>> AudioDecoderExtManual for O {
+pub trait AudioDecoderExtManual: sealed::Sealed + IsA<AudioDecoder> + 'static {
     #[doc(alias = "gst_audio_decoder_negotiate")]
     fn negotiate(&self) -> Result<(), gst::FlowError> {
         unsafe {
@@ -96,6 +72,7 @@ impl<O: IsA<AudioDecoder>> AudioDecoderExtManual for O {
         }
     }
 
+    #[doc(alias = "get_allocator")]
     #[doc(alias = "gst_audio_decoder_get_allocator")]
     fn allocator(&self) -> (Option<gst::Allocator>, gst::AllocationParams) {
         unsafe {
@@ -110,6 +87,7 @@ impl<O: IsA<AudioDecoder>> AudioDecoderExtManual for O {
         }
     }
 
+    #[allow(clippy::too_many_arguments)]
     fn error<T: gst::MessageErrorDomain>(
         &self,
         weight: i32,
@@ -150,6 +128,8 @@ impl<O: IsA<AudioDecoder>> AudioDecoderExtManual for O {
     }
 }
 
+impl<O: IsA<AudioDecoder>> AudioDecoderExtManual for O {}
+
 #[macro_export]
 macro_rules! audio_decoder_error(
     ($obj:expr, $weight:expr, $err:expr, ($($msg:tt)*), [$($debug:tt)*]) => { {

gstreamer-audio/src/audio_encoder.rs

@@ -6,26 +6,13 @@ use glib::{prelude::*, translate::*};
 
 use crate::AudioEncoder;
 
-pub trait AudioEncoderExtManual: 'static {
-    #[doc(alias = "gst_audio_encoder_negotiate")]
-    fn negotiate(&self) -> Result<(), gst::FlowError>;
-
-    #[doc(alias = "gst_audio_encoder_set_output_format")]
-    fn set_output_format(&self, caps: &gst::Caps) -> Result<(), gst::FlowError>;
-
-    #[doc(alias = "get_allocator")]
-    #[doc(alias = "gst_audio_encoder_get_allocator")]
-    fn allocator(&self) -> (Option<gst::Allocator>, gst::AllocationParams);
-
-    #[doc(alias = "gst_audio_encoder_set_headers")]
-    fn set_headers(&self, headers: impl IntoIterator<Item = gst::Buffer>);
-
-    fn sink_pad(&self) -> &gst::Pad;
-
-    fn src_pad(&self) -> &gst::Pad;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::AudioEncoder>> Sealed for T {}
 }
 
-impl<O: IsA<AudioEncoder>> AudioEncoderExtManual for O {
+pub trait AudioEncoderExtManual: sealed::Sealed + IsA<AudioEncoder> + 'static {
+    #[doc(alias = "gst_audio_encoder_negotiate")]
     fn negotiate(&self) -> Result<(), gst::FlowError> {
         unsafe {
             let ret = from_glib(ffi::gst_audio_encoder_negotiate(
@@ -39,6 +26,7 @@ impl<O: IsA<AudioEncoder>> AudioEncoderExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_audio_encoder_set_output_format")]
     fn set_output_format(&self, caps: &gst::Caps) -> Result<(), gst::FlowError> {
         unsafe {
             let ret = from_glib(ffi::gst_audio_encoder_set_output_format(
@@ -53,6 +41,8 @@ impl<O: IsA<AudioEncoder>> AudioEncoderExtManual for O {
         }
     }
 
+    #[doc(alias = "get_allocator")]
+    #[doc(alias = "gst_audio_encoder_get_allocator")]
     fn allocator(&self) -> (Option<gst::Allocator>, gst::AllocationParams) {
         unsafe {
             let mut allocator = ptr::null_mut();
@@ -66,6 +56,7 @@ impl<O: IsA<AudioEncoder>> AudioEncoderExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_audio_encoder_set_headers")]
     fn set_headers(&self, headers: impl IntoIterator<Item = gst::Buffer>) {
         unsafe {
             ffi::gst_audio_encoder_set_headers(
@@ -92,3 +83,5 @@ impl<O: IsA<AudioEncoder>> AudioEncoderExtManual for O {
         }
     }
 }
+
+impl<O: IsA<AudioEncoder>> AudioEncoderExtManual for O {}

gstreamer-audio/src/subclass/audio_aggregator.rs

@@ -26,22 +26,12 @@ pub trait AudioAggregatorImpl: AudioAggregatorImplExt + AggregatorImpl {
     }
 }
 
-pub trait AudioAggregatorImplExt: ObjectSubclass {
-    fn parent_create_output_buffer(&self, num_frames: u32) -> Option<gst::Buffer>;
-
-    #[allow(clippy::too_many_arguments)]
-    fn parent_aggregate_one_buffer(
-        &self,
-        pad: &AudioAggregatorPad,
-        inbuf: &gst::BufferRef,
-        in_offset: u32,
-        outbuf: &mut gst::BufferRef,
-        out_offset: u32,
-        num_frames: u32,
-    ) -> bool;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::AudioAggregatorImplExt> Sealed for T {}
 }
 
-impl<T: AudioAggregatorImpl> AudioAggregatorImplExt for T {
+pub trait AudioAggregatorImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_create_output_buffer(&self, num_frames: u32) -> Option<gst::Buffer> {
         unsafe {
             let data = Self::type_data();
@@ -92,6 +82,8 @@ impl<T: AudioAggregatorImpl> AudioAggregatorImplExt for T {
     }
 }
 
+impl<T: AudioAggregatorImpl> AudioAggregatorImplExt for T {}
+
 unsafe impl<T: AudioAggregatorImpl> IsSubclassable<T> for AudioAggregator {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-audio/src/subclass/audio_aggregator_pad.rs

@@ -24,18 +24,12 @@ pub trait AudioAggregatorPadImpl: AudioAggregatorPadImplExt + AggregatorPadImpl
     }
 }
 
-pub trait AudioAggregatorPadImplExt: ObjectSubclass {
-    fn parent_update_conversion_info(&self);
-
-    fn parent_convert_buffer(
-        &self,
-        in_info: &crate::AudioInfo,
-        out_info: &crate::AudioInfo,
-        buffer: &gst::Buffer,
-    ) -> Option<gst::Buffer>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::AudioAggregatorPadImplExt> Sealed for T {}
 }
 
-impl<T: AudioAggregatorPadImpl> AudioAggregatorPadImplExt for T {
+pub trait AudioAggregatorPadImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_update_conversion_info(&self) {
         unsafe {
             let data = Self::type_data();
@@ -75,6 +69,8 @@ impl<T: AudioAggregatorPadImpl> AudioAggregatorPadImplExt for T {
     }
 }
 
+impl<T: AudioAggregatorPadImpl> AudioAggregatorPadImplExt for T {}
+
 unsafe impl<T: AudioAggregatorPadImpl> IsSubclassable<T> for AudioAggregatorPad {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-audio/src/subclass/audio_decoder.rs

@@ -86,52 +86,12 @@ pub trait AudioDecoderImpl: AudioDecoderImplExt + ElementImpl {
     }
 }
 
-pub trait AudioDecoderImplExt: ObjectSubclass {
-    fn parent_open(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_close(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_start(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_stop(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_set_format(&self, caps: &gst::Caps) -> Result<(), gst::LoggableError>;
-
-    fn parent_parse(&self, adapter: &gst_base::Adapter) -> Result<(u32, u32), gst::FlowError>;
-
-    fn parent_handle_frame(
-        &self,
-        buffer: Option<&gst::Buffer>,
-    ) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_pre_push(&self, buffer: gst::Buffer) -> Result<Option<gst::Buffer>, gst::FlowError>;
-
-    fn parent_flush(&self, hard: bool);
-
-    fn parent_negotiate(&self) -> Result<(), gst::LoggableError>;
-
-    fn parent_caps(&self, filter: Option<&gst::Caps>) -> gst::Caps;
-
-    fn parent_sink_event(&self, event: gst::Event) -> bool;
-
-    fn parent_sink_query(&self, query: &mut gst::QueryRef) -> bool;
-
-    fn parent_src_event(&self, event: gst::Event) -> bool;
-
-    fn parent_src_query(&self, query: &mut gst::QueryRef) -> bool;
-
-    fn parent_propose_allocation(
-        &self,
-        query: &mut gst::query::Allocation,
-    ) -> Result<(), gst::LoggableError>;
-
-    fn parent_decide_allocation(
-        &self,
-        query: &mut gst::query::Allocation,
-    ) -> Result<(), gst::LoggableError>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::AudioDecoderImplExt> Sealed for T {}
 }
 
-impl<T: AudioDecoderImpl> AudioDecoderImplExt for T {
+pub trait AudioDecoderImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_open(&self) -> Result<(), gst::ErrorMessage> {
         unsafe {
             let data = Self::type_data();
@@ -513,6 +473,8 @@ impl<T: AudioDecoderImpl> AudioDecoderImplExt for T {
     }
 }
 
+impl<T: AudioDecoderImpl> AudioDecoderImplExt for T {}
+
 unsafe impl<T: AudioDecoderImpl> IsSubclassable<T> for AudioDecoder {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-audio/src/subclass/audio_encoder.rs

@@ -82,50 +82,12 @@ pub trait AudioEncoderImpl: AudioEncoderImplExt + ElementImpl {
     }
 }
 
-pub trait AudioEncoderImplExt: ObjectSubclass {
-    fn parent_open(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_close(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_start(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_stop(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_set_format(&self, info: &AudioInfo) -> Result<(), gst::LoggableError>;
-
-    fn parent_handle_frame(
-        &self,
-        buffer: Option<&gst::Buffer>,
-    ) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_pre_push(&self, buffer: gst::Buffer) -> Result<Option<gst::Buffer>, gst::FlowError>;
-
-    fn parent_flush(&self);
-
-    fn parent_negotiate(&self) -> Result<(), gst::LoggableError>;
-
-    fn parent_caps(&self, filter: Option<&gst::Caps>) -> gst::Caps;
-
-    fn parent_sink_event(&self, event: gst::Event) -> bool;
-
-    fn parent_sink_query(&self, query: &mut gst::QueryRef) -> bool;
-
-    fn parent_src_event(&self, event: gst::Event) -> bool;
-
-    fn parent_src_query(&self, query: &mut gst::QueryRef) -> bool;
-
-    fn parent_propose_allocation(
-        &self,
-        query: &mut gst::query::Allocation,
-    ) -> Result<(), gst::LoggableError>;
-
-    fn parent_decide_allocation(
-        &self,
-        query: &mut gst::query::Allocation,
-    ) -> Result<(), gst::LoggableError>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::AudioEncoderImplExt> Sealed for T {}
 }
 
-impl<T: AudioEncoderImpl> AudioEncoderImplExt for T {
+pub trait AudioEncoderImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_open(&self) -> Result<(), gst::ErrorMessage> {
         unsafe {
             let data = Self::type_data();
@@ -475,6 +437,8 @@ impl<T: AudioEncoderImpl> AudioEncoderImplExt for T {
     }
 }
 
+impl<T: AudioEncoderImpl> AudioEncoderImplExt for T {}
+
 unsafe impl<T: AudioEncoderImpl> IsSubclassable<T> for AudioEncoder {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-audio/src/subclass/audio_filter.rs

@@ -13,11 +13,12 @@ pub trait AudioFilterImpl: AudioFilterImplExt + BaseTransformImpl {
     }
 }
 
-pub trait AudioFilterImplExt: ObjectSubclass {
-    fn parent_setup(&self, info: &AudioInfo) -> Result<(), gst::LoggableError>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::AudioFilterImplExt> Sealed for T {}
 }
 
-impl<T: AudioFilterImpl> AudioFilterImplExt for T {
+pub trait AudioFilterImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_setup(&self, info: &AudioInfo) -> Result<(), gst::LoggableError> {
         unsafe {
             let data = Self::type_data();
@@ -39,6 +40,8 @@ impl<T: AudioFilterImpl> AudioFilterImplExt for T {
     }
 }
 
+impl<T: AudioFilterImpl> AudioFilterImplExt for T {}
+
 unsafe impl<T: AudioFilterImpl> IsSubclassable<T> for AudioFilter {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-audio/src/subclass/audio_sink.rs

@@ -37,17 +37,12 @@ pub trait AudioSinkImpl: AudioSinkImplExt + AudioBaseSinkImpl {
     }
 }
 
-pub trait AudioSinkImplExt: ObjectSubclass {
-    fn parent_close(&self) -> Result<(), LoggableError>;
-    fn parent_delay(&self) -> u32;
-    fn parent_open(&self) -> Result<(), LoggableError>;
-    fn parent_prepare(&self, spec: &mut AudioRingBufferSpec) -> Result<(), LoggableError>;
-    fn parent_unprepare(&self) -> Result<(), LoggableError>;
-    fn parent_write(&self, audio_data: &[u8]) -> Result<i32, LoggableError>;
-    fn parent_reset(&self);
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::AudioSinkImplExt> Sealed for T {}
 }
 
-impl<T: AudioSinkImpl> AudioSinkImplExt for T {
+pub trait AudioSinkImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_close(&self) -> Result<(), LoggableError> {
         unsafe {
             let data = Self::type_data();
@@ -168,6 +163,8 @@ impl<T: AudioSinkImpl> AudioSinkImplExt for T {
     }
 }
 
+impl<T: AudioSinkImpl> AudioSinkImplExt for T {}
+
 unsafe impl<T: AudioSinkImpl> IsSubclassable<T> for AudioSink {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-audio/src/subclass/audio_src.rs

@@ -39,20 +39,12 @@ pub trait AudioSrcImpl: AudioSrcImplExt + AudioBaseSrcImpl {
     }
 }
 
-pub trait AudioSrcImplExt: ObjectSubclass {
-    fn parent_close(&self) -> Result<(), LoggableError>;
-    fn parent_delay(&self) -> u32;
-    fn parent_open(&self) -> Result<(), LoggableError>;
-    fn parent_prepare(&self, spec: &mut AudioRingBufferSpec) -> Result<(), LoggableError>;
-    fn parent_unprepare(&self) -> Result<(), LoggableError>;
-    fn parent_read(
-        &self,
-        audio_data: &mut [u8],
-    ) -> Result<(u32, Option<gst::ClockTime>), LoggableError>;
-    fn parent_reset(&self);
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::AudioSrcImplExt> Sealed for T {}
 }
 
-impl<T: AudioSrcImpl> AudioSrcImplExt for T {
+pub trait AudioSrcImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_close(&self) -> Result<(), LoggableError> {
         unsafe {
             let data = Self::type_data();
@@ -178,6 +170,8 @@ impl<T: AudioSrcImpl> AudioSrcImplExt for T {
     }
 }
 
+impl<T: AudioSrcImpl> AudioSrcImplExt for T {}
+
 unsafe impl<T: AudioSrcImpl> IsSubclassable<T> for AudioSrc {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-base/src/aggregator.rs

@@ -17,71 +17,14 @@ use gst::{format::FormattedValue, prelude::*};
 use crate::Aggregator;
 use crate::AggregatorPad;
 
-pub trait AggregatorExtManual: 'static {
-    #[doc(alias = "get_allocator")]
-    #[doc(alias = "gst_aggregator_get_allocator")]
-    fn allocator(&self) -> (Option<gst::Allocator>, gst::AllocationParams);
-
-    #[cfg(feature = "v1_16")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_16")))]
-    #[doc(alias = "min-upstream-latency")]
-    fn min_upstream_latency(&self) -> gst::ClockTime;
-
-    #[cfg(feature = "v1_16")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_16")))]
-    #[doc(alias = "min-upstream-latency")]
-    fn set_min_upstream_latency(&self, min_upstream_latency: gst::ClockTime);
-
-    #[cfg(feature = "v1_16")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_16")))]
-    #[doc(alias = "min-upstream-latency")]
-    fn connect_min_upstream_latency_notify<F: Fn(&Self) + Send + Sync + 'static>(
-        &self,
-        f: F,
-    ) -> SignalHandlerId;
-
-    #[cfg(feature = "v1_18")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
-    #[doc(alias = "gst_aggregator_update_segment")]
-    fn update_segment<F: gst::format::FormattedValueIntrinsic>(
-        &self,
-        segment: &gst::FormattedSegment<F>,
-    );
-
-    fn set_position(&self, position: impl FormattedValue);
-
-    #[cfg(feature = "v1_18")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
-    #[doc(alias = "gst_aggregator_selected_samples")]
-    fn selected_samples(
-        &self,
-        pts: impl Into<Option<gst::ClockTime>>,
-        dts: impl Into<Option<gst::ClockTime>>,
-        duration: impl Into<Option<gst::ClockTime>>,
-        info: Option<&gst::StructureRef>,
-    );
-
-    #[cfg(feature = "v1_18")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
-    fn connect_samples_selected<
-        F: Fn(
-                &Self,
-                &gst::Segment,
-                Option<gst::ClockTime>,
-                Option<gst::ClockTime>,
-                Option<gst::ClockTime>,
-                Option<&gst::StructureRef>,
-            ) + Send
-            + 'static,
-    >(
-        &self,
-        f: F,
-    ) -> SignalHandlerId;
-
-    fn src_pad(&self) -> &AggregatorPad;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::Aggregator>> Sealed for T {}
 }
 
-impl<O: IsA<Aggregator>> AggregatorExtManual for O {
+pub trait AggregatorExtManual: sealed::Sealed + IsA<Aggregator> + 'static {
+    #[doc(alias = "get_allocator")]
+    #[doc(alias = "gst_aggregator_get_allocator")]
     fn allocator(&self) -> (Option<gst::Allocator>, gst::AllocationParams) {
         unsafe {
             let mut allocator = ptr::null_mut();
@@ -97,12 +40,14 @@ impl<O: IsA<Aggregator>> AggregatorExtManual for O {
 
     #[cfg(feature = "v1_16")]
     #[cfg_attr(docsrs, doc(cfg(feature = "v1_16")))]
+    #[doc(alias = "min-upstream-latency")]
     fn min_upstream_latency(&self) -> gst::ClockTime {
         self.as_ref().property("min-upstream-latency")
     }
 
     #[cfg(feature = "v1_16")]
     #[cfg_attr(docsrs, doc(cfg(feature = "v1_16")))]
+    #[doc(alias = "min-upstream-latency")]
     fn set_min_upstream_latency(&self, min_upstream_latency: gst::ClockTime) {
         self.as_ref()
             .set_property("min-upstream-latency", min_upstream_latency);
@@ -110,6 +55,7 @@ impl<O: IsA<Aggregator>> AggregatorExtManual for O {
 
     #[cfg(feature = "v1_16")]
     #[cfg_attr(docsrs, doc(cfg(feature = "v1_16")))]
+    #[doc(alias = "min-upstream-latency")]
     fn connect_min_upstream_latency_notify<F: Fn(&Self) + Send + Sync + 'static>(
         &self,
         f: F,
@@ -126,8 +72,10 @@ impl<O: IsA<Aggregator>> AggregatorExtManual for O {
             )
         }
     }
+
     #[cfg(feature = "v1_18")]
     #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
+    #[doc(alias = "gst_aggregator_update_segment")]
     fn update_segment<F: gst::format::FormattedValueIntrinsic>(
         &self,
         segment: &gst::FormattedSegment<F>,
@@ -157,6 +105,7 @@ impl<O: IsA<Aggregator>> AggregatorExtManual for O {
 
     #[cfg(feature = "v1_18")]
     #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
+    #[doc(alias = "gst_aggregator_selected_samples")]
     fn selected_samples(
         &self,
         pts: impl Into<Option<gst::ClockTime>>,
@@ -177,8 +126,7 @@ impl<O: IsA<Aggregator>> AggregatorExtManual for O {
         }
     }
 
-    #[cfg(feature = "v1_18")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
+    #[cfg(any(feature = "v1_18", feature = "dox"))]
     fn connect_samples_selected<
         F: Fn(
                 &Self,
@@ -251,6 +199,8 @@ impl<O: IsA<Aggregator>> AggregatorExtManual for O {
     }
 }
 
+impl<O: IsA<Aggregator>> AggregatorExtManual for O {}
+
 #[cfg(feature = "v1_16")]
 #[cfg_attr(docsrs, doc(cfg(feature = "v1_16")))]
 unsafe extern "C" fn notify_min_upstream_latency_trampoline<P, F: Fn(&P) + Send + Sync + 'static>(

gstreamer-base/src/aggregator_pad.rs

@@ -5,12 +5,13 @@ use gst::prelude::*;
 
 use crate::AggregatorPad;
 
-pub trait AggregatorPadExtManual: 'static {
-    #[doc(alias = "get_segment")]
-    fn segment(&self) -> gst::Segment;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::AggregatorPad>> Sealed for T {}
 }
 
-impl<O: IsA<AggregatorPad>> AggregatorPadExtManual for O {
+pub trait AggregatorPadExtManual: sealed::Sealed + IsA<AggregatorPad> + 'static {
+    #[doc(alias = "get_segment")]
     fn segment(&self) -> gst::Segment {
         unsafe {
             let ptr: &ffi::GstAggregatorPad = &*(self.as_ptr() as *const _);
@@ -19,3 +20,5 @@ impl<O: IsA<AggregatorPad>> AggregatorPadExtManual for O {
         }
     }
 }
+
+impl<O: IsA<AggregatorPad>> AggregatorPadExtManual for O {}

gstreamer-base/src/base_parse.rs

@@ -7,37 +7,13 @@ use gst::format::{FormattedValue, SpecificFormattedValueFullRange};
 
 use crate::{BaseParse, BaseParseFrame};
 
-pub trait BaseParseExtManual: 'static {
-    #[doc(alias = "get_sink_pad")]
-    fn sink_pad(&self) -> &gst::Pad;
-    #[doc(alias = "get_src_pad")]
-    fn src_pad(&self) -> &gst::Pad;
-
-    #[doc(alias = "gst_base_parse_set_duration")]
-    fn set_duration(&self, duration: impl FormattedValue, interval: u32);
-    #[doc(alias = "gst_base_parse_set_frame_rate")]
-    fn set_frame_rate(&self, fps: gst::Fraction, lead_in: u32, lead_out: u32);
-
-    #[doc(alias = "gst_base_parse_convert_default")]
-    fn convert_default<U: SpecificFormattedValueFullRange>(
-        &self,
-        src_val: impl FormattedValue,
-    ) -> Option<U>;
-    fn convert_default_generic(
-        &self,
-        src_val: impl FormattedValue,
-        dest_format: gst::Format,
-    ) -> Option<gst::GenericFormattedValue>;
-
-    #[doc(alias = "gst_base_parse_finish_frame")]
-    fn finish_frame(
-        &self,
-        frame: BaseParseFrame,
-        size: u32,
-    ) -> Result<gst::FlowSuccess, gst::FlowError>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::BaseParse>> Sealed for T {}
 }
 
-impl<O: IsA<BaseParse>> BaseParseExtManual for O {
+pub trait BaseParseExtManual: sealed::Sealed + IsA<BaseParse> + 'static {
+    #[doc(alias = "get_sink_pad")]
     fn sink_pad(&self) -> &gst::Pad {
         unsafe {
             let elt = &*(self.as_ptr() as *const ffi::GstBaseParse);
@@ -45,6 +21,7 @@ impl<O: IsA<BaseParse>> BaseParseExtManual for O {
         }
     }
 
+    #[doc(alias = "get_src_pad")]
     fn src_pad(&self) -> &gst::Pad {
         unsafe {
             let elt = &*(self.as_ptr() as *const ffi::GstBaseParse);
@@ -52,6 +29,7 @@ impl<O: IsA<BaseParse>> BaseParseExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_base_parse_set_duration")]
     fn set_duration(&self, duration: impl FormattedValue, interval: u32) {
         unsafe {
             ffi::gst_base_parse_set_duration(
@@ -63,6 +41,7 @@ impl<O: IsA<BaseParse>> BaseParseExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_base_parse_set_frame_rate")]
     fn set_frame_rate(&self, fps: gst::Fraction, lead_in: u32, lead_out: u32) {
         let (fps_num, fps_den) = fps.into();
         unsafe {
@@ -76,6 +55,7 @@ impl<O: IsA<BaseParse>> BaseParseExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_base_parse_convert_default")]
     fn convert_default<U: SpecificFormattedValueFullRange>(
         &self,
         src_val: impl FormattedValue,
@@ -122,6 +102,7 @@ impl<O: IsA<BaseParse>> BaseParseExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_base_parse_finish_frame")]
     fn finish_frame(
         &self,
         frame: BaseParseFrame,
@@ -136,3 +117,5 @@ impl<O: IsA<BaseParse>> BaseParseExtManual for O {
         }
     }
 }
+
+impl<O: IsA<BaseParse>> BaseParseExtManual for O {}

gstreamer-base/src/base_sink.rs

@@ -7,19 +7,13 @@ use gst::prelude::*;
 
 use crate::BaseSink;
 
-pub trait BaseSinkExtManual: 'static {
-    #[doc(alias = "get_segment")]
-    fn segment(&self) -> gst::Segment;
-
-    #[doc(alias = "gst_base_sink_query_latency")]
-    fn query_latency(
-        &self,
-    ) -> Result<(bool, bool, Option<gst::ClockTime>, Option<gst::ClockTime>), glib::BoolError>;
-
-    fn sink_pad(&self) -> &gst::Pad;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::BaseSink>> Sealed for T {}
 }
 
-impl<O: IsA<BaseSink>> BaseSinkExtManual for O {
+pub trait BaseSinkExtManual: sealed::Sealed + IsA<BaseSink> + 'static {
+    #[doc(alias = "get_segment")]
     fn segment(&self) -> gst::Segment {
         unsafe {
             let sink: &ffi::GstBaseSink = &*(self.as_ptr() as *const _);
@@ -28,6 +22,7 @@ impl<O: IsA<BaseSink>> BaseSinkExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_base_sink_query_latency")]
     fn query_latency(
         &self,
     ) -> Result<(bool, bool, Option<gst::ClockTime>, Option<gst::ClockTime>), glib::BoolError> {
@@ -67,3 +62,5 @@ impl<O: IsA<BaseSink>> BaseSinkExtManual for O {
         }
     }
 }
+
+impl<O: IsA<BaseSink>> BaseSinkExtManual for O {}

gstreamer-base/src/base_src.rs

@@ -7,23 +7,14 @@ use gst::prelude::*;
 
 use crate::BaseSrc;
 
-pub trait BaseSrcExtManual: 'static {
-    #[doc(alias = "get_allocator")]
-    #[doc(alias = "gst_base_src_get_allocator")]
-    fn allocator(&self) -> (Option<gst::Allocator>, gst::AllocationParams);
-
-    #[doc(alias = "get_segment")]
-    fn segment(&self) -> gst::Segment;
-
-    #[doc(alias = "gst_base_src_query_latency")]
-    fn query_latency(
-        &self,
-    ) -> Result<(bool, Option<gst::ClockTime>, Option<gst::ClockTime>), glib::BoolError>;
-
-    fn src_pad(&self) -> &gst::Pad;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::BaseSrc>> Sealed for T {}
 }
 
-impl<O: IsA<BaseSrc>> BaseSrcExtManual for O {
+pub trait BaseSrcExtManual: sealed::Sealed + IsA<BaseSrc> + 'static {
+    #[doc(alias = "get_allocator")]
+    #[doc(alias = "gst_base_src_get_allocator")]
     fn allocator(&self) -> (Option<gst::Allocator>, gst::AllocationParams) {
         unsafe {
             let mut allocator = ptr::null_mut();
@@ -37,6 +28,7 @@ impl<O: IsA<BaseSrc>> BaseSrcExtManual for O {
         }
     }
 
+    #[doc(alias = "get_segment")]
     fn segment(&self) -> gst::Segment {
         unsafe {
             let src: &ffi::GstBaseSrc = &*(self.as_ptr() as *const _);
@@ -45,6 +37,7 @@ impl<O: IsA<BaseSrc>> BaseSrcExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_base_src_query_latency")]
     fn query_latency(
         &self,
     ) -> Result<(bool, Option<gst::ClockTime>, Option<gst::ClockTime>), glib::BoolError> {
@@ -80,3 +73,5 @@ impl<O: IsA<BaseSrc>> BaseSrcExtManual for O {
         }
     }
 }
+
+impl<O: IsA<BaseSrc>> BaseSrcExtManual for O {}

gstreamer-base/src/base_transform.rs

@@ -7,20 +7,14 @@ use gst::prelude::*;
 
 use crate::BaseTransform;
 
-pub trait BaseTransformExtManual: 'static {
-    #[doc(alias = "get_allocator")]
-    #[doc(alias = "gst_base_transform_get_allocator")]
-    fn allocator(&self) -> (Option<gst::Allocator>, gst::AllocationParams);
-
-    #[doc(alias = "get_segment")]
-    fn segment(&self) -> gst::Segment;
-
-    fn sink_pad(&self) -> &gst::Pad;
-
-    fn src_pad(&self) -> &gst::Pad;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::BaseTransform>> Sealed for T {}
 }
 
-impl<O: IsA<BaseTransform>> BaseTransformExtManual for O {
+pub trait BaseTransformExtManual: sealed::Sealed + IsA<BaseTransform> + 'static {
+    #[doc(alias = "get_allocator")]
+    #[doc(alias = "gst_base_transform_get_allocator")]
     fn allocator(&self) -> (Option<gst::Allocator>, gst::AllocationParams) {
         unsafe {
             let mut allocator = ptr::null_mut();
@@ -34,6 +28,7 @@ impl<O: IsA<BaseTransform>> BaseTransformExtManual for O {
         }
     }
 
+    #[doc(alias = "get_segment")]
     fn segment(&self) -> gst::Segment {
         unsafe {
             let trans: &ffi::GstBaseTransform = &*(self.as_ptr() as *const _);
@@ -56,3 +51,5 @@ impl<O: IsA<BaseTransform>> BaseTransformExtManual for O {
         }
     }
 }
+
+impl<O: IsA<BaseTransform>> BaseTransformExtManual for O {}

gstreamer-base/src/subclass/aggregator.rs

@@ -135,98 +135,12 @@ pub trait AggregatorImpl: AggregatorImplExt + ElementImpl {
     }
 }
 
-pub trait AggregatorImplExt: ObjectSubclass {
-    fn parent_flush(&self) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_clip(
-        &self,
-        aggregator_pad: &AggregatorPad,
-        buffer: gst::Buffer,
-    ) -> Option<gst::Buffer>;
-
-    fn parent_finish_buffer(&self, buffer: gst::Buffer)
-        -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    #[cfg(feature = "v1_18")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
-    fn parent_finish_buffer_list(
-        &self,
-        buffer_list: gst::BufferList,
-    ) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_sink_event(&self, aggregator_pad: &AggregatorPad, event: gst::Event) -> bool;
-
-    #[cfg(feature = "v1_18")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
-    fn parent_sink_event_pre_queue(
-        &self,
-        aggregator_pad: &AggregatorPad,
-        event: gst::Event,
-    ) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_sink_query(&self, aggregator_pad: &AggregatorPad, query: &mut gst::QueryRef) -> bool;
-
-    #[cfg(feature = "v1_18")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
-    fn parent_sink_query_pre_queue(
-        &self,
-        aggregator_pad: &AggregatorPad,
-        query: &mut gst::QueryRef,
-    ) -> bool;
-
-    fn parent_src_event(&self, event: gst::Event) -> bool;
-
-    fn parent_src_query(&self, query: &mut gst::QueryRef) -> bool;
-
-    fn parent_src_activate(
-        &self,
-        mode: gst::PadMode,
-        active: bool,
-    ) -> Result<(), gst::LoggableError>;
-
-    fn parent_aggregate(&self, timeout: bool) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_start(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_stop(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_next_time(&self) -> Option<gst::ClockTime>;
-
-    fn parent_create_new_pad(
-        &self,
-        templ: &gst::PadTemplate,
-        req_name: Option<&str>,
-        caps: Option<&gst::Caps>,
-    ) -> Option<AggregatorPad>;
-
-    fn parent_update_src_caps(&self, caps: &gst::Caps) -> Result<gst::Caps, gst::FlowError>;
-
-    fn parent_fixate_src_caps(&self, caps: gst::Caps) -> gst::Caps;
-
-    fn parent_negotiated_src_caps(&self, caps: &gst::Caps) -> Result<(), gst::LoggableError>;
-
-    fn parent_propose_allocation(
-        &self,
-        pad: &AggregatorPad,
-        decide_query: Option<&gst::query::Allocation>,
-        query: &mut gst::query::Allocation,
-    ) -> Result<(), gst::LoggableError>;
-
-    fn parent_decide_allocation(
-        &self,
-        query: &mut gst::query::Allocation,
-    ) -> Result<(), gst::LoggableError>;
-
-    #[cfg(feature = "v1_18")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
-    fn parent_negotiate(&self) -> bool;
-
-    #[cfg(feature = "v1_18")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
-    fn parent_peek_next_sample(&self, pad: &AggregatorPad) -> Option<gst::Sample>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::AggregatorImplExt> Sealed for T {}
 }
 
-impl<T: AggregatorImpl> AggregatorImplExt for T {
+pub trait AggregatorImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_flush(&self) -> Result<gst::FlowSuccess, gst::FlowError> {
         unsafe {
             let data = Self::type_data();
@@ -668,6 +582,8 @@ impl<T: AggregatorImpl> AggregatorImplExt for T {
     }
 }
 
+impl<T: AggregatorImpl> AggregatorImplExt for T {}
+
 unsafe impl<T: AggregatorImpl> IsSubclassable<T> for Aggregator {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-base/src/subclass/aggregator_pad.rs

@@ -15,13 +15,12 @@ pub trait AggregatorPadImpl: AggregatorPadImplExt + PadImpl {
     }
 }
 
-pub trait AggregatorPadImplExt: ObjectSubclass {
-    fn parent_flush(&self, aggregator: &Aggregator) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_skip_buffer(&self, aggregator: &Aggregator, buffer: &gst::Buffer) -> bool;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::AggregatorPadImplExt> Sealed for T {}
 }
 
-impl<T: AggregatorPadImpl> AggregatorPadImplExt for T {
+pub trait AggregatorPadImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_flush(&self, aggregator: &Aggregator) -> Result<gst::FlowSuccess, gst::FlowError> {
         unsafe {
             let data = Self::type_data();
@@ -61,6 +60,8 @@ impl<T: AggregatorPadImpl> AggregatorPadImplExt for T {
         }
     }
 }
+
+impl<T: AggregatorPadImpl> AggregatorPadImplExt for T {}
 unsafe impl<T: AggregatorPadImpl> IsSubclassable<T> for AggregatorPad {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-base/src/subclass/base_parse.rs

@@ -36,26 +36,12 @@ pub trait BaseParseImpl: BaseParseImplExt + ElementImpl {
     }
 }
 
-pub trait BaseParseImplExt: ObjectSubclass {
-    fn parent_start(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_stop(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_set_sink_caps(&self, caps: &gst::Caps) -> Result<(), gst::LoggableError>;
-
-    fn parent_handle_frame(
-        &self,
-        frame: BaseParseFrame,
-    ) -> Result<(gst::FlowSuccess, u32), gst::FlowError>;
-
-    fn parent_convert(
-        &self,
-        src_val: impl gst::format::FormattedValue,
-        dest_format: gst::Format,
-    ) -> Option<gst::GenericFormattedValue>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::BaseParseImplExt> Sealed for T {}
 }
 
-impl<T: BaseParseImpl> BaseParseImplExt for T {
+pub trait BaseParseImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_start(&self) -> Result<(), gst::ErrorMessage> {
         unsafe {
             let data = Self::type_data();
@@ -180,6 +166,8 @@ impl<T: BaseParseImpl> BaseParseImplExt for T {
     }
 }
 
+impl<T: BaseParseImpl> BaseParseImplExt for T {}
+
 unsafe impl<T: BaseParseImpl> IsSubclassable<T> for BaseParse {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-base/src/subclass/base_sink.rs

@@ -68,46 +68,12 @@ pub trait BaseSinkImpl: BaseSinkImplExt + ElementImpl {
     }
 }
 
-pub trait BaseSinkImplExt: ObjectSubclass {
-    fn parent_start(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_stop(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_render(&self, buffer: &gst::Buffer) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_prepare(&self, buffer: &gst::Buffer) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_render_list(
-        &self,
-        list: &gst::BufferList,
-    ) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_prepare_list(
-        &self,
-        list: &gst::BufferList,
-    ) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_query(&self, query: &mut gst::QueryRef) -> bool;
-
-    fn parent_event(&self, event: gst::Event) -> bool;
-
-    fn parent_caps(&self, filter: Option<&gst::Caps>) -> Option<gst::Caps>;
-
-    fn parent_set_caps(&self, caps: &gst::Caps) -> Result<(), gst::LoggableError>;
-
-    fn parent_fixate(&self, caps: gst::Caps) -> gst::Caps;
-
-    fn parent_unlock(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_unlock_stop(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_propose_allocation(
-        &self,
-        query: &mut gst::query::Allocation,
-    ) -> Result<(), gst::LoggableError>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::BaseSinkImplExt> Sealed for T {}
 }
 
-impl<T: BaseSinkImpl> BaseSinkImplExt for T {
+pub trait BaseSinkImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_start(&self) -> Result<(), gst::ErrorMessage> {
         unsafe {
             let data = Self::type_data();
@@ -183,50 +149,12 @@ impl<T: BaseSinkImpl> BaseSinkImplExt for T {
     fn parent_render_list(
         &self,
         list: &gst::BufferList,
-    ) -> Result<gst::FlowSuccess, gst::FlowError> {
-        unsafe {
-            let data = Self::type_data();
-            let parent_class = data.as_ref().parent_class() as *mut ffi::GstBaseSinkClass;
-            (*parent_class)
-                .render_list
-                .map(|f| {
-                    try_from_glib(f(
-                        self.obj().unsafe_cast_ref::<BaseSink>().to_glib_none().0,
-                        list.to_glib_none().0,
-                    ))
-                })
-                .unwrap_or_else(|| {
-                    for buffer in list.iter() {
-                        self.render(&from_glib_borrow(buffer.as_ptr()))?;
-                    }
-                    Ok(gst::FlowSuccess::Ok)
-                })
-        }
-    }
+    ) -> Result<gst::FlowSuccess, gst::FlowError>;
 
     fn parent_prepare_list(
         &self,
         list: &gst::BufferList,
-    ) -> Result<gst::FlowSuccess, gst::FlowError> {
-        unsafe {
-            let data = Self::type_data();
-            let parent_class = data.as_ref().parent_class() as *mut ffi::GstBaseSinkClass;
-            (*parent_class)
-                .prepare_list
-                .map(|f| {
-                    try_from_glib(f(
-                        self.obj().unsafe_cast_ref::<BaseSink>().to_glib_none().0,
-                        list.to_glib_none().0,
-                    ))
-                })
-                .unwrap_or_else(|| {
-                    for buffer in list.iter() {
-                        self.prepare(&from_glib_borrow(buffer.as_ptr()))?;
-                    }
-                    Ok(gst::FlowSuccess::Ok)
-                })
-        }
-    }
+    ) -> Result<gst::FlowSuccess, gst::FlowError>;
 
     fn parent_query(&self, query: &mut gst::QueryRef) -> bool {
         unsafe {
@@ -376,6 +304,56 @@ impl<T: BaseSinkImpl> BaseSinkImplExt for T {
     }
 }
 
+impl<T: BaseSinkImpl> BaseSinkImplExt for T {
+    fn parent_render_list(
+        &self,
+        list: &gst::BufferList,
+    ) -> Result<gst::FlowSuccess, gst::FlowError> {
+        unsafe {
+            let data = Self::type_data();
+            let parent_class = data.as_ref().parent_class() as *mut ffi::GstBaseSinkClass;
+            (*parent_class)
+                .render_list
+                .map(|f| {
+                    try_from_glib(f(
+                        self.obj().unsafe_cast_ref::<BaseSink>().to_glib_none().0,
+                        list.to_glib_none().0,
+                    ))
+                })
+                .unwrap_or_else(|| {
+                    for buffer in list.iter() {
+                        self.render(&from_glib_borrow(buffer.as_ptr()))?;
+                    }
+                    Ok(gst::FlowSuccess::Ok)
+                })
+        }
+    }
+
+    fn parent_prepare_list(
+        &self,
+        list: &gst::BufferList,
+    ) -> Result<gst::FlowSuccess, gst::FlowError> {
+        unsafe {
+            let data = Self::type_data();
+            let parent_class = data.as_ref().parent_class() as *mut ffi::GstBaseSinkClass;
+            (*parent_class)
+                .prepare_list
+                .map(|f| {
+                    try_from_glib(f(
+                        self.obj().unsafe_cast_ref::<BaseSink>().to_glib_none().0,
+                        list.to_glib_none().0,
+                    ))
+                })
+                .unwrap_or_else(|| {
+                    for buffer in list.iter() {
+                        self.prepare(&from_glib_borrow(buffer.as_ptr()))?;
+                    }
+                    Ok(gst::FlowSuccess::Ok)
+                })
+        }
+    }
+}
+
 unsafe impl<T: BaseSinkImpl> IsSubclassable<T> for BaseSink {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-base/src/subclass/base_src.rs

@@ -108,61 +108,12 @@ pub trait BaseSrcImpl: BaseSrcImplExt + ElementImpl {
     }
 }
 
-pub trait BaseSrcImplExt: ObjectSubclass {
-    fn parent_start(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_stop(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_is_seekable(&self) -> bool;
-
-    fn parent_size(&self) -> Option<u64>;
-
-    fn parent_times(
-        &self,
-        buffer: &gst::BufferRef,
-    ) -> (Option<gst::ClockTime>, Option<gst::ClockTime>);
-
-    fn parent_fill(
-        &self,
-        offset: u64,
-        length: u32,
-        buffer: &mut gst::BufferRef,
-    ) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_alloc(&self, offset: u64, length: u32) -> Result<gst::Buffer, gst::FlowError>;
-
-    fn parent_create(
-        &self,
-        offset: u64,
-        buffer: Option<&mut gst::BufferRef>,
-        length: u32,
-    ) -> Result<CreateSuccess, gst::FlowError>;
-
-    fn parent_do_seek(&self, segment: &mut gst::Segment) -> bool;
-
-    fn parent_query(&self, query: &mut gst::QueryRef) -> bool;
-
-    fn parent_event(&self, event: &gst::Event) -> bool;
-
-    fn parent_caps(&self, filter: Option<&gst::Caps>) -> Option<gst::Caps>;
-
-    fn parent_negotiate(&self) -> Result<(), gst::LoggableError>;
-
-    fn parent_set_caps(&self, caps: &gst::Caps) -> Result<(), gst::LoggableError>;
-
-    fn parent_fixate(&self, caps: gst::Caps) -> gst::Caps;
-
-    fn parent_unlock(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_unlock_stop(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_decide_allocation(
-        &self,
-        query: &mut gst::query::Allocation,
-    ) -> Result<(), gst::LoggableError>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::BaseSrcImplExt> Sealed for T {}
 }
 
-impl<T: BaseSrcImpl> BaseSrcImplExt for T {
+pub trait BaseSrcImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_start(&self) -> Result<(), gst::ErrorMessage> {
         unsafe {
             let data = Self::type_data();
@@ -607,6 +558,8 @@ impl<T: BaseSrcImpl> BaseSrcImplExt for T {
     }
 }
 
+impl<T: BaseSrcImpl> BaseSrcImplExt for T {}
+
 unsafe impl<T: BaseSrcImpl> IsSubclassable<T> for BaseSrc {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-base/src/subclass/base_transform.rs

@@ -154,117 +154,12 @@ pub trait BaseTransformImpl: BaseTransformImplExt + ElementImpl {
     }
 }
 
-pub trait BaseTransformImplExt: ObjectSubclass {
-    fn parent_start(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_stop(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_transform_caps(
-        &self,
-        direction: gst::PadDirection,
-        caps: &gst::Caps,
-        filter: Option<&gst::Caps>,
-    ) -> Option<gst::Caps>;
-
-    fn parent_fixate_caps(
-        &self,
-        direction: gst::PadDirection,
-        caps: &gst::Caps,
-        othercaps: gst::Caps,
-    ) -> gst::Caps;
-
-    fn parent_set_caps(
-        &self,
-        incaps: &gst::Caps,
-        outcaps: &gst::Caps,
-    ) -> Result<(), gst::LoggableError>;
-
-    fn parent_accept_caps(&self, direction: gst::PadDirection, caps: &gst::Caps) -> bool;
-
-    fn parent_query(&self, direction: gst::PadDirection, query: &mut gst::QueryRef) -> bool;
-
-    fn parent_transform_size(
-        &self,
-        direction: gst::PadDirection,
-        caps: &gst::Caps,
-        size: usize,
-        othercaps: &gst::Caps,
-    ) -> Option<usize>;
-
-    fn parent_unit_size(&self, caps: &gst::Caps) -> Option<usize>;
-
-    fn parent_sink_event(&self, event: gst::Event) -> bool;
-
-    fn parent_src_event(&self, event: gst::Event) -> bool;
-
-    fn parent_prepare_output_buffer(
-        &self,
-        inbuf: InputBuffer,
-    ) -> Result<PrepareOutputBufferSuccess, gst::FlowError>;
-
-    fn parent_transform(
-        &self,
-        inbuf: &gst::Buffer,
-        outbuf: &mut gst::BufferRef,
-    ) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_transform_ip(
-        &self,
-        buf: &mut gst::BufferRef,
-    ) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_transform_ip_passthrough(
-        &self,
-        buf: &gst::Buffer,
-    ) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_propose_allocation(
-        &self,
-        decide_query: Option<&gst::query::Allocation>,
-        query: &mut gst::query::Allocation,
-    ) -> Result<(), gst::LoggableError>;
-
-    fn parent_decide_allocation(
-        &self,
-        query: &mut gst::query::Allocation,
-    ) -> Result<(), gst::LoggableError>;
-
-    fn parent_copy_metadata(
-        &self,
-        inbuf: &gst::BufferRef,
-        outbuf: &mut gst::BufferRef,
-    ) -> Result<(), gst::LoggableError>;
-
-    fn parent_transform_meta<'a>(
-        &self,
-        outbuf: &mut gst::BufferRef,
-        meta: gst::MetaRef<'a, gst::Meta>,
-        inbuf: &'a gst::BufferRef,
-    ) -> bool;
-
-    fn parent_before_transform(&self, inbuf: &gst::BufferRef);
-
-    fn parent_submit_input_buffer(
-        &self,
-        is_discont: bool,
-        inbuf: gst::Buffer,
-    ) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_generate_output(&self) -> Result<GenerateOutputSuccess, gst::FlowError>;
-
-    fn take_queued_buffer(&self) -> Option<gst::Buffer>
-    where
-        Self: ObjectSubclass,
-        <Self as ObjectSubclass>::ParentType: IsA<BaseTransform>;
-
-    #[doc(alias = "get_queued_buffer")]
-    fn queued_buffer(&self) -> Option<gst::Buffer>
-    where
-        Self: ObjectSubclass,
-        <Self as ObjectSubclass>::ParentType: IsA<BaseTransform>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::BaseTransformImplExt> Sealed for T {}
 }
 
-impl<T: BaseTransformImpl> BaseTransformImplExt for T {
+pub trait BaseTransformImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_start(&self) -> Result<(), gst::ErrorMessage> {
         unsafe {
             let data = Self::type_data();
@@ -887,6 +782,8 @@ impl<T: BaseTransformImpl> BaseTransformImplExt for T {
     }
 }
 
+impl<T: BaseTransformImpl> BaseTransformImplExt for T {}
+
 unsafe impl<T: BaseTransformImpl> IsSubclassable<T> for BaseTransform {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-base/src/subclass/push_src.rs

@@ -22,18 +22,12 @@ pub trait PushSrcImpl: PushSrcImplExt + BaseSrcImpl {
     }
 }
 
-pub trait PushSrcImplExt: ObjectSubclass {
-    fn parent_fill(&self, buffer: &mut gst::BufferRef) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_alloc(&self) -> Result<gst::Buffer, gst::FlowError>;
-
-    fn parent_create(
-        &self,
-        buffer: Option<&mut gst::BufferRef>,
-    ) -> Result<CreateSuccess, gst::FlowError>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::PushSrcImplExt> Sealed for T {}
 }
 
-impl<T: PushSrcImpl> PushSrcImplExt for T {
+pub trait PushSrcImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_fill(&self, buffer: &mut gst::BufferRef) -> Result<gst::FlowSuccess, gst::FlowError> {
         unsafe {
             let data = Self::type_data();
@@ -186,6 +180,8 @@ impl<T: PushSrcImpl> PushSrcImplExt for T {
     }
 }
 
+impl<T: PushSrcImpl> PushSrcImplExt for T {}
+
 unsafe impl<T: PushSrcImpl> IsSubclassable<T> for PushSrc {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-editing-services/src/formatter.rs

@@ -1,22 +1,13 @@
 // Take a look at the license at the top of the repository in the LICENSE file.
-use crate::prelude::*;
+use crate::{prelude::*, Formatter};
 use gst::glib::translate::*;
 
-pub trait FormatterExtManual: 'static {
-    fn can_load_uri(&self, uri: &str) -> Result<(), glib::Error>;
-    #[doc(alias = "ges_formatter_class_register_metas")]
-    fn register(
-        type_: glib::types::Type,
-        name: &str,
-        description: Option<&str>,
-        extensions: Option<&str>,
-        caps: Option<&str>,
-        version: f64,
-        rank: gst::Rank,
-    );
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::Formatter>> Sealed for T {}
 }
 
-impl<O: IsA<crate::Formatter>> FormatterExtManual for O {
+pub trait FormatterExtManual: sealed::Sealed + IsA<Formatter> + 'static {
     fn can_load_uri(&self, uri: &str) -> Result<(), glib::Error> {
         unsafe {
             let klass = self.class_of::<crate::Formatter>().unwrap();
@@ -71,3 +62,5 @@ impl<O: IsA<crate::Formatter>> FormatterExtManual for O {
         }
     }
 }
+
+impl<O: IsA<Formatter>> FormatterExtManual for O {}

gstreamer-editing-services/src/subclass/formatter.rs

@@ -23,24 +23,12 @@ pub trait FormatterImpl: FormatterImplExt + ObjectImpl + Send + Sync {
     }
 }
 
-pub trait FormatterImplExt: ObjectSubclass {
-    fn parent_can_load_uri(&self, uri: &str) -> Result<(), glib::Error>;
-
-    fn parent_load_from_uri(
-        &self,
-        timeline: &crate::Timeline,
-        uri: &str,
-    ) -> Result<(), glib::Error>;
-
-    fn parent_save_to_uri(
-        &self,
-        timeline: &crate::Timeline,
-        uri: &str,
-        overwrite: bool,
-    ) -> Result<(), glib::Error>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::FormatterImplExt> Sealed for T {}
 }
 
-impl<T: FormatterImpl> FormatterImplExt for T {
+pub trait FormatterImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_can_load_uri(&self, uri: &str) -> Result<(), glib::Error> {
         unsafe {
             let data = Self::type_data();
@@ -161,6 +149,8 @@ impl<T: FormatterImpl> FormatterImplExt for T {
     }
 }
 
+impl<T: FormatterImpl> FormatterImplExt for T {}
+
 unsafe impl<T: FormatterImpl> IsSubclassable<T> for Formatter {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-gl/src/gl_context.rs

@@ -45,21 +45,20 @@ impl GLContext {
     }
 }
 
-pub trait GLContextExtManual: 'static {
-    #[doc(alias = "get_gl_context")]
-    #[doc(alias = "gst_gl_context_get_gl_context")]
-    fn gl_context(&self) -> uintptr_t;
-
-    #[doc(alias = "get_proc_address")]
-    #[doc(alias = "gst_gl_context_get_proc_address")]
-    fn proc_address(&self, name: &str) -> uintptr_t;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::GLContext>> Sealed for T {}
 }
 
-impl<O: IsA<GLContext>> GLContextExtManual for O {
+pub trait GLContextExtManual: sealed::Sealed + IsA<GLContext> + 'static {
+    #[doc(alias = "get_gl_context")]
+    #[doc(alias = "gst_gl_context_get_gl_context")]
     fn gl_context(&self) -> uintptr_t {
         unsafe { ffi::gst_gl_context_get_gl_context(self.as_ref().to_glib_none().0) as uintptr_t }
     }
 
+    #[doc(alias = "get_proc_address")]
+    #[doc(alias = "gst_gl_context_get_proc_address")]
     fn proc_address(&self, name: &str) -> uintptr_t {
         unsafe {
             ffi::gst_gl_context_get_proc_address(
@@ -69,3 +68,5 @@ impl<O: IsA<GLContext>> GLContextExtManual for O {
         }
     }
 }
+
+impl<O: IsA<GLContext>> GLContextExtManual for O {}

gstreamer-gl/src/gl_display.rs

@@ -3,20 +3,15 @@ use crate::{GLContext, GLDisplay};
 use glib::prelude::*;
 use glib::translate::*;
 
-pub trait GLDisplayExtManual: 'static {
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::GLDisplay>> Sealed for T {}
+}
+
+pub trait GLDisplayExtManual: sealed::Sealed + IsA<GLDisplay> + 'static {
     #[cfg(feature = "v1_24")]
     #[cfg_attr(docsrs, doc(cfg(feature = "v1_24")))]
     #[doc(alias = "gst_gl_display_ensure_context")]
-    fn ensure_context(
-        &self,
-        other_context: Option<&impl IsA<GLContext>>,
-        context: &mut Option<GLContext>,
-    ) -> Result<(), glib::Error>;
-}
-
-impl<O: IsA<GLDisplay>> GLDisplayExtManual for O {
-    #[cfg(feature = "v1_24")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_24")))]
     fn ensure_context(
         &self,
         other_context: Option<&impl IsA<GLContext>>,
@@ -43,6 +38,8 @@ impl<O: IsA<GLDisplay>> GLDisplayExtManual for O {
     }
 }
 
+impl<O: IsA<GLDisplay>> GLDisplayExtManual for O {}
+
 impl GLDisplay {
     #[doc(alias = "gst_gl_display_get_gl_context_for_thread")]
     pub fn get_gl_context_for_current_thread(

gstreamer-gl/src/subclass/gl_base_filter.rs

@@ -19,15 +19,12 @@ pub trait GLBaseFilterImpl: GLBaseFilterImplExt + BaseTransformImpl {
     }
 }
 
-pub trait GLBaseFilterImplExt: ObjectSubclass {
-    fn parent_gl_set_caps(&self, incaps: &Caps, outcaps: &Caps) -> Result<(), LoggableError>;
-
-    fn parent_gl_start(&self) -> Result<(), LoggableError>;
-
-    fn parent_gl_stop(&self);
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::GLBaseFilterImplExt> Sealed for T {}
 }
 
-impl<T: GLBaseFilterImpl> GLBaseFilterImplExt for T {
+pub trait GLBaseFilterImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_gl_set_caps(&self, incaps: &Caps, outcaps: &Caps) -> Result<(), LoggableError> {
         unsafe {
             let data = Self::type_data();
@@ -91,6 +88,8 @@ impl<T: GLBaseFilterImpl> GLBaseFilterImplExt for T {
     }
 }
 
+impl<T: GLBaseFilterImpl> GLBaseFilterImplExt for T {}
+
 unsafe impl<T: GLBaseFilterImpl> IsSubclassable<T> for GLBaseFilter {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-gl/src/subclass/gl_base_src.rs

@@ -21,15 +21,12 @@ pub trait GLBaseSrcImpl: GLBaseSrcImplExt + PushSrcImpl {
     }
 }
 
-pub trait GLBaseSrcImplExt: ObjectSubclass {
-    fn parent_gl_start(&self) -> Result<(), LoggableError>;
-
-    fn parent_gl_stop(&self);
-
-    fn parent_fill_gl_memory(&self, memory: &GLMemory) -> Result<(), LoggableError>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::GLBaseSrcImplExt> Sealed for T {}
 }
 
-impl<T: GLBaseSrcImpl> GLBaseSrcImplExt for T {
+pub trait GLBaseSrcImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_gl_start(&self) -> Result<(), LoggableError> {
         unsafe {
             let data = Self::type_data();
@@ -81,6 +78,8 @@ impl<T: GLBaseSrcImpl> GLBaseSrcImplExt for T {
     }
 }
 
+impl<T: GLBaseSrcImpl> GLBaseSrcImplExt for T {}
+
 unsafe impl<T: GLBaseSrcImpl> IsSubclassable<T> for GLBaseSrc {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-gl/src/subclass/gl_filter.rs

@@ -46,28 +46,12 @@ pub trait GLFilterImpl: GLFilterImplExt + GLBaseFilterImpl {
     }
 }
 
-pub trait GLFilterImplExt: ObjectSubclass {
-    fn parent_set_caps(&self, incaps: &Caps, outcaps: &Caps) -> Result<(), LoggableError>;
-
-    fn parent_filter(&self, input: &Buffer, output: &Buffer) -> Result<(), LoggableError>;
-
-    fn parent_filter_texture(
-        &self,
-        input: &GLMemory,
-        output: &GLMemory,
-    ) -> Result<(), LoggableError>;
-
-    fn parent_init_fbo(&self) -> Result<(), LoggableError>;
-
-    fn parent_transform_internal_caps(
-        &self,
-        direction: PadDirection,
-        caps: &Caps,
-        filter_caps: Option<&Caps>,
-    ) -> Option<Caps>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::GLFilterImplExt> Sealed for T {}
 }
 
-impl<T: GLFilterImpl> GLFilterImplExt for T {
+pub trait GLFilterImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_set_caps(&self, incaps: &Caps, outcaps: &Caps) -> Result<(), LoggableError> {
         unsafe {
             let data = Self::type_data();
@@ -179,6 +163,8 @@ impl<T: GLFilterImpl> GLFilterImplExt for T {
     }
 }
 
+impl<T: GLFilterImpl> GLFilterImplExt for T {}
+
 unsafe impl<T: GLFilterImpl> IsSubclassable<T> for GLFilter {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-pbutils/src/audio_visualizer.rs

@@ -5,22 +5,16 @@ use gst::prelude::*;
 
 use crate::{auto::AudioVisualizer, subclass::AudioVisualizerSetupToken};
 
-pub trait AudioVisualizerExtManual: 'static {
-    // rustdoc-stripper-ignore-next
-    /// Returns the number of samples per frame required before calling the render method
-    fn req_spf(&self) -> u32;
-
-    // rustdoc-stripper-ignore-next
-    /// Modify the request of samples per frame required to be present in buffer before calling
-    /// the render method
-    fn set_req_spf(&self, spf: u32, token: &AudioVisualizerSetupToken);
-
-    fn audio_info(&self) -> gst_audio::AudioInfo;
-
-    fn video_info(&self) -> gst_video::VideoInfo;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::AudioVisualizer>> Sealed for T {}
 }
 
-impl<O: IsA<AudioVisualizer> + ElementExt> AudioVisualizerExtManual for O {
+pub trait AudioVisualizerExtManual:
+    sealed::Sealed + IsA<AudioVisualizer> + IsA<gst::Element> + 'static
+{
+    // rustdoc-stripper-ignore-next
+    /// Returns the number of samples per frame required before calling the render method
     fn req_spf(&self) -> u32 {
         let sinkpad = self.static_pad("sink").expect("sink pad presence");
         let _stream_lock = sinkpad.stream_lock();
@@ -29,6 +23,9 @@ impl<O: IsA<AudioVisualizer> + ElementExt> AudioVisualizerExtManual for O {
         unsafe { (*ptr).req_spf }
     }
 
+    // rustdoc-stripper-ignore-next
+    /// Modify the request of samples per frame required to be present in buffer before calling
+    /// the render method
     fn set_req_spf(&self, spf: u32, token: &AudioVisualizerSetupToken) {
         assert_eq!(
             self.as_ptr() as *mut ffi::GstAudioVisualizer,
@@ -70,3 +67,5 @@ impl<O: IsA<AudioVisualizer> + ElementExt> AudioVisualizerExtManual for O {
         }
     }
 }
+
+impl<O: IsA<AudioVisualizer> + IsA<gst::Element>> AudioVisualizerExtManual for O {}

gstreamer-pbutils/src/discoverer_stream_info.rs

@@ -31,12 +31,14 @@ impl Iterator for Iter {
 
 impl std::iter::FusedIterator for Iter {}
 
-pub trait DiscovererStreamInfoExtManual: 'static {
-    fn next_iter(&self) -> Iter;
-    fn previous_iter(&self) -> Iter;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::DiscovererStreamInfo>> Sealed for T {}
 }
 
-impl<O: IsA<DiscovererStreamInfo>> DiscovererStreamInfoExtManual for O {
+pub trait DiscovererStreamInfoExtManual:
+    sealed::Sealed + IsA<DiscovererStreamInfo> + 'static
+{
     fn next_iter(&self) -> Iter {
         Iter {
             stream_info: self.next(),
@@ -52,6 +54,8 @@ impl<O: IsA<DiscovererStreamInfo>> DiscovererStreamInfoExtManual for O {
     }
 }
 
+impl<O: IsA<DiscovererStreamInfo>> DiscovererStreamInfoExtManual for O {}
+
 pub struct Debug<'a>(&'a DiscovererStreamInfo);
 
 impl<'a> fmt::Debug for Debug<'a> {

gstreamer-pbutils/src/encoding_profile.rs

@@ -8,17 +8,16 @@ use crate::auto::{
 #[cfg(feature = "v1_20")]
 use crate::ElementProperties;
 
-pub trait EncodingProfileExtManual {
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::EncodingProfile>> Sealed for T {}
+}
+
+pub trait EncodingProfileExtManual: sealed::Sealed + IsA<EncodingProfile> + 'static {
     #[cfg(feature = "v1_20")]
     #[cfg_attr(docsrs, doc(cfg(feature = "v1_20")))]
     #[doc(alias = "gst_encoding_profile_get_element_properties")]
     #[doc(alias = "get_element_properties")]
-    fn element_properties(&self) -> Option<ElementProperties>;
-}
-
-impl<O: IsA<EncodingProfile>> EncodingProfileExtManual for O {
-    #[cfg(feature = "v1_20")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_20")))]
     fn element_properties(&self) -> Option<ElementProperties> {
         unsafe {
             from_glib_full::<_, Option<_>>(ffi::gst_encoding_profile_get_element_properties(
@@ -29,6 +28,8 @@ impl<O: IsA<EncodingProfile>> EncodingProfileExtManual for O {
     }
 }
 
+impl<O: IsA<EncodingProfile>> EncodingProfileExtManual for O {}
+
 trait EncodingProfileBuilderCommon {
     fn set_allow_dynamic_output(&self, allow_dynamic_output: bool);
 

gstreamer-pbutils/src/subclass/audio_visualizer.rs

@@ -28,22 +28,12 @@ pub trait AudioVisualizerImpl: AudioVisualizerImplExt + ElementImpl {
     }
 }
 
-pub trait AudioVisualizerImplExt: ObjectSubclass {
-    fn parent_setup(&self, token: &AudioVisualizerSetupToken) -> Result<(), LoggableError>;
-
-    fn parent_render(
-        &self,
-        audio_buffer: &gst::BufferRef,
-        video_frame: &mut gst_video::VideoFrameRef<&mut gst::BufferRef>,
-    ) -> Result<(), LoggableError>;
-
-    fn parent_decide_allocation(
-        &self,
-        query: &mut gst::query::Allocation,
-    ) -> Result<(), gst::LoggableError>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::AudioVisualizerImplExt> Sealed for T {}
 }
 
-impl<T: AudioVisualizerImpl> AudioVisualizerImplExt for T {
+pub trait AudioVisualizerImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_setup(&self, token: &AudioVisualizerSetupToken) -> Result<(), LoggableError> {
         assert_eq!(
             self.obj().as_ptr() as *mut ffi::GstAudioVisualizer,
@@ -125,6 +115,8 @@ impl<T: AudioVisualizerImpl> AudioVisualizerImplExt for T {
     }
 }
 
+impl<T: AudioVisualizerImpl> AudioVisualizerImplExt for T {}
+
 unsafe impl<T: AudioVisualizerImpl> IsSubclassable<T> for AudioVisualizer {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-play/src/subclass/play_video_renderer.rs

@@ -16,11 +16,12 @@ unsafe impl<T: PlayVideoRendererImpl> IsImplementable<T> for PlayVideoRenderer {
     }
 }
 
-pub trait PlayVideoRendererImplExt: ObjectSubclass {
-    fn parent_create_video_sink(&self, play: &Play) -> gst::Element;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::PlayVideoRendererImplExt> Sealed for T {}
 }
 
-impl<T: PlayVideoRendererImpl> PlayVideoRendererImplExt for T {
+pub trait PlayVideoRendererImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_create_video_sink(&self, play: &Play) -> gst::Element {
         unsafe {
             let type_data = Self::type_data();
@@ -42,6 +43,8 @@ impl<T: PlayVideoRendererImpl> PlayVideoRendererImplExt for T {
     }
 }
 
+impl<T: PlayVideoRendererImpl> PlayVideoRendererImplExt for T {}
+
 unsafe extern "C" fn video_renderer_create_video_sink<T: PlayVideoRendererImpl>(
     video_renderer: *mut ffi::GstPlayVideoRenderer,
     play: *mut ffi::GstPlay,

gstreamer-player/src/subclass/player_video_renderer.rs

@@ -16,11 +16,12 @@ unsafe impl<T: PlayerVideoRendererImpl> IsImplementable<T> for PlayerVideoRender
     }
 }
 
-pub trait PlayerVideoRendererImplExt: ObjectSubclass {
-    fn parent_create_video_sink(&self, player: &Player) -> gst::Element;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::PlayerVideoRendererImplExt> Sealed for T {}
 }
 
-impl<T: PlayerVideoRendererImpl> PlayerVideoRendererImplExt for T {
+pub trait PlayerVideoRendererImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_create_video_sink(&self, player: &Player) -> gst::Element {
         unsafe {
             let type_data = Self::type_data();
@@ -42,6 +43,8 @@ impl<T: PlayerVideoRendererImpl> PlayerVideoRendererImplExt for T {
     }
 }
 
+impl<T: PlayerVideoRendererImpl> PlayerVideoRendererImplExt for T {}
+
 unsafe extern "C" fn video_renderer_create_video_sink<T: PlayerVideoRendererImpl>(
     video_renderer: *mut ffi::GstPlayerVideoRenderer,
     player: *mut ffi::GstPlayer,

gstreamer-rtp/src/rtp_base_depayload.rs

@@ -2,13 +2,12 @@ use glib::object::IsA;
 
 use crate::RTPBaseDepayload;
 
-pub trait RTPBaseDepayloadExtManual: 'static {
-    fn sink_pad(&self) -> &gst::Pad;
-
-    fn src_pad(&self) -> &gst::Pad;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::RTPBaseDepayload>> Sealed for T {}
 }
 
-impl<O: IsA<RTPBaseDepayload>> RTPBaseDepayloadExtManual for O {
+pub trait RTPBaseDepayloadExtManual: sealed::Sealed + IsA<RTPBaseDepayload> + 'static {
     fn sink_pad(&self) -> &gst::Pad {
         unsafe {
             let elt = &*(self.as_ptr() as *const ffi::GstRTPBaseDepayload);
@@ -23,3 +22,5 @@ impl<O: IsA<RTPBaseDepayload>> RTPBaseDepayloadExtManual for O {
         }
     }
 }
+
+impl<O: IsA<RTPBaseDepayload>> RTPBaseDepayloadExtManual for O {}

gstreamer-rtp/src/rtp_base_payload.rs

@@ -4,21 +4,16 @@ use glib::{object::IsA, translate::*};
 
 use crate::RTPBasePayload;
 
-pub trait RTPBasePayloadExtManual: 'static {
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::RTPBasePayload>> Sealed for T {}
+}
+
+pub trait RTPBasePayloadExtManual: sealed::Sealed + IsA<RTPBasePayload> + 'static {
     #[cfg(feature = "v1_20")]
     #[cfg_attr(docsrs, doc(cfg(feature = "v1_20")))]
     #[doc(alias = "gst_rtp_base_payload_set_outcaps_structure")]
     #[doc(alias = "gst_rtp_base_payload_set_outcaps")]
-    fn set_outcaps(&self, s: Option<&gst::StructureRef>) -> Result<(), glib::error::BoolError>;
-
-    fn sink_pad(&self) -> &gst::Pad;
-
-    fn src_pad(&self) -> &gst::Pad;
-}
-
-impl<O: IsA<RTPBasePayload>> RTPBasePayloadExtManual for O {
-    #[cfg(feature = "v1_20")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_20")))]
     fn set_outcaps(&self, s: Option<&gst::StructureRef>) -> Result<(), glib::error::BoolError> {
         unsafe {
             glib::result_from_gboolean!(
@@ -47,3 +42,5 @@ impl<O: IsA<RTPBasePayload>> RTPBasePayloadExtManual for O {
         }
     }
 }
+
+impl<O: IsA<RTPBasePayload>> RTPBasePayloadExtManual for O {}

gstreamer-rtp/src/rtp_header_extension.rs

@@ -2,35 +2,13 @@ use glib::{object::IsA, translate::*};
 
 use crate::{RTPHeaderExtension, RTPHeaderExtensionFlags};
 
-pub trait RTPHeaderExtensionExtManual: 'static {
-    #[doc(alias = "gst_rtp_header_extension_read")]
-    fn read(
-        &self,
-        read_flags: RTPHeaderExtensionFlags,
-        data: &[u8],
-        buffer: &mut gst::BufferRef,
-    ) -> bool;
-
-    #[doc(alias = "gst_rtp_header_extension_write")]
-    fn write(
-        &self,
-        input_meta: &gst::Buffer,
-        write_flags: RTPHeaderExtensionFlags,
-        output: &mut gst::BufferRef,
-        data: &mut [u8],
-    ) -> Result<usize, glib::BoolError>;
-
-    #[doc(alias = "gst_rtp_header_extension_set_caps_from_attributes")]
-    fn set_caps_from_attributes(&self, caps: &mut gst::CapsRef) -> bool;
-
-    #[doc(alias = "gst_rtp_header_extension_set_caps_from_attributes_helper")]
-    fn set_caps_from_attributes_helper(&self, caps: &mut gst::CapsRef, attributes: &str) -> bool;
-
-    #[doc(alias = "gst_rtp_header_extension_update_non_rtp_src_caps")]
-    fn update_non_rtp_src_caps(&self, caps: &mut gst::CapsRef) -> bool;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::RTPHeaderExtension>> Sealed for T {}
 }
 
-impl<O: IsA<RTPHeaderExtension>> RTPHeaderExtensionExtManual for O {
+pub trait RTPHeaderExtensionExtManual: sealed::Sealed + IsA<RTPHeaderExtension> + 'static {
+    #[doc(alias = "gst_rtp_header_extension_read")]
     fn read(
         &self,
         read_flags: RTPHeaderExtensionFlags,
@@ -49,6 +27,7 @@ impl<O: IsA<RTPHeaderExtension>> RTPHeaderExtensionExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_rtp_header_extension_write")]
     fn write(
         &self,
         input_meta: &gst::Buffer,
@@ -75,6 +54,7 @@ impl<O: IsA<RTPHeaderExtension>> RTPHeaderExtensionExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_rtp_header_extension_set_caps_from_attributes")]
     fn set_caps_from_attributes(&self, caps: &mut gst::CapsRef) -> bool {
         unsafe {
             from_glib(ffi::gst_rtp_header_extension_set_caps_from_attributes(
@@ -84,6 +64,7 @@ impl<O: IsA<RTPHeaderExtension>> RTPHeaderExtensionExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_rtp_header_extension_set_caps_from_attributes_helper")]
     fn set_caps_from_attributes_helper(&self, caps: &mut gst::CapsRef, attributes: &str) -> bool {
         unsafe {
             from_glib(
@@ -96,6 +77,7 @@ impl<O: IsA<RTPHeaderExtension>> RTPHeaderExtensionExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_rtp_header_extension_update_non_rtp_src_caps")]
     fn update_non_rtp_src_caps(&self, caps: &mut gst::CapsRef) -> bool {
         unsafe {
             from_glib(ffi::gst_rtp_header_extension_update_non_rtp_src_caps(
@@ -105,3 +87,5 @@ impl<O: IsA<RTPHeaderExtension>> RTPHeaderExtensionExtManual for O {
         }
     }
 }
+
+impl<O: IsA<RTPHeaderExtension>> RTPHeaderExtensionExtManual for O {}

gstreamer-rtp/src/subclass/rtp_base_depayload.rs

@@ -28,20 +28,12 @@ pub trait RTPBaseDepayloadImpl: RTPBaseDepayloadImplExt + ElementImpl {
     }
 }
 
-pub trait RTPBaseDepayloadImplExt: ObjectSubclass {
-    fn parent_set_caps(&self, caps: &gst::Caps) -> Result<(), gst::LoggableError>;
-
-    fn parent_handle_event(&self, event: gst::Event) -> bool;
-
-    fn parent_packet_lost(&self, event: &gst::EventRef) -> bool;
-
-    fn parent_process_rtp_packet(
-        &self,
-        rtp_buffer: &crate::RTPBuffer<crate::rtp_buffer::Readable>,
-    ) -> Option<gst::Buffer>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::RTPBaseDepayloadImplExt> Sealed for T {}
 }
 
-impl<T: RTPBaseDepayloadImpl> RTPBaseDepayloadImplExt for T {
+pub trait RTPBaseDepayloadImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_set_caps(&self, caps: &gst::Caps) -> Result<(), gst::LoggableError> {
         unsafe {
             let data = Self::type_data();
@@ -126,6 +118,8 @@ impl<T: RTPBaseDepayloadImpl> RTPBaseDepayloadImplExt for T {
     }
 }
 
+impl<T: RTPBaseDepayloadImpl> RTPBaseDepayloadImplExt for T {}
+
 unsafe impl<T: RTPBaseDepayloadImpl> IsSubclassable<T> for RTPBaseDepayload {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-rtp/src/subclass/rtp_base_payload.rs

@@ -31,22 +31,12 @@ pub trait RTPBasePayloadImpl: RTPBasePayloadImplExt + ElementImpl {
     }
 }
 
-pub trait RTPBasePayloadImplExt: ObjectSubclass {
-    fn parent_caps(&self, pad: &gst::Pad, filter: Option<&gst::Caps>) -> gst::Caps;
-
-    fn parent_set_caps(&self, caps: &gst::Caps) -> Result<(), gst::LoggableError>;
-
-    fn parent_handle_buffer(&self, buffer: gst::Buffer)
-        -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_query(&self, pad: &gst::Pad, query: &mut gst::QueryRef) -> bool;
-
-    fn parent_sink_event(&self, event: gst::Event) -> bool;
-
-    fn parent_src_event(&self, event: gst::Event) -> bool;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::RTPBasePayloadImplExt> Sealed for T {}
 }
 
-impl<T: RTPBasePayloadImpl> RTPBasePayloadImplExt for T {
+pub trait RTPBasePayloadImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_caps(&self, pad: &gst::Pad, filter: Option<&gst::Caps>) -> gst::Caps {
         unsafe {
             let data = Self::type_data();
@@ -175,6 +165,8 @@ impl<T: RTPBasePayloadImpl> RTPBasePayloadImplExt for T {
     }
 }
 
+impl<T: RTPBasePayloadImpl> RTPBasePayloadImplExt for T {}
+
 unsafe impl<T: RTPBasePayloadImpl> IsSubclassable<T> for RTPBasePayload {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-rtp/src/subclass/rtp_header_extension.rs

@@ -55,39 +55,12 @@ pub trait RTPHeaderExtensionImpl: RTPHeaderExtensionImplExt + ElementImpl {
     }
 }
 
-pub trait RTPHeaderExtensionImplExt: ObjectSubclass {
-    fn parent_supported_flags(&self) -> crate::RTPHeaderExtensionFlags;
-    fn parent_max_size(&self, input: &gst::BufferRef) -> usize;
-    fn parent_write(
-        &self,
-        input: &gst::BufferRef,
-        write_flags: crate::RTPHeaderExtensionFlags,
-        output: &mut gst::BufferRef,
-        output_data: &mut [u8],
-    ) -> Result<usize, gst::LoggableError>;
-    fn parent_read(
-        &self,
-        read_flags: crate::RTPHeaderExtensionFlags,
-        input_data: &[u8],
-        output: &mut gst::BufferRef,
-    ) -> Result<(), gst::LoggableError>;
-    fn parent_set_non_rtp_sink_caps(&self, caps: &gst::Caps) -> Result<(), gst::LoggableError>;
-    fn parent_update_non_rtp_src_caps(
-        &self,
-        caps: &mut gst::CapsRef,
-    ) -> Result<(), gst::LoggableError>;
-    fn parent_set_attributes(
-        &self,
-        direction: crate::RTPHeaderExtensionDirection,
-        attributes: &str,
-    ) -> Result<(), gst::LoggableError>;
-    fn parent_set_caps_from_attributes(
-        &self,
-        caps: &mut gst::CapsRef,
-    ) -> Result<(), gst::LoggableError>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::RTPHeaderExtensionImplExt> Sealed for T {}
 }
 
-impl<T: RTPHeaderExtensionImpl> RTPHeaderExtensionImplExt for T {
+pub trait RTPHeaderExtensionImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_supported_flags(&self) -> crate::RTPHeaderExtensionFlags {
         unsafe {
             let data = Self::type_data();
@@ -287,6 +260,8 @@ impl<T: RTPHeaderExtensionImpl> RTPHeaderExtensionImplExt for T {
     }
 }
 
+impl<T: RTPHeaderExtensionImpl> RTPHeaderExtensionImplExt for T {}
+
 unsafe impl<T: RTPHeaderExtensionImpl> IsSubclassable<T> for crate::RTPHeaderExtension {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-rtsp-server/src/rtsp_address_pool.rs

@@ -6,18 +6,13 @@ use glib::{prelude::*, translate::*};
 
 use crate::{RTSPAddress, RTSPAddressPool, RTSPAddressPoolResult};
 
-pub trait RTSPAddressPoolExtManual: 'static {
-    #[doc(alias = "gst_rtsp_address_pool_reserve_address")]
-    fn reserve_address(
-        &self,
-        ip_address: &str,
-        port: u32,
-        n_ports: u32,
-        ttl: u32,
-    ) -> Result<RTSPAddress, RTSPAddressPoolResult>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::RTSPAddressPool>> Sealed for T {}
 }
 
-impl<O: IsA<RTSPAddressPool>> RTSPAddressPoolExtManual for O {
+pub trait RTSPAddressPoolExtManual: sealed::Sealed + IsA<RTSPAddressPool> + 'static {
+    #[doc(alias = "gst_rtsp_address_pool_reserve_address")]
     fn reserve_address(
         &self,
         ip_address: &str,
@@ -42,3 +37,5 @@ impl<O: IsA<RTSPAddressPool>> RTSPAddressPoolExtManual for O {
         }
     }
 }
+
+impl<O: IsA<RTSPAddressPool>> RTSPAddressPoolExtManual for O {}

gstreamer-rtsp-server/src/rtsp_auth.rs

@@ -10,27 +10,13 @@ use glib::{
 
 use crate::{RTSPAuth, RTSPToken};
 
-pub trait RTSPAuthExtManual: 'static {
-    #[doc(alias = "gst_rtsp_auth_set_default_token")]
-    fn set_default_token(&self, token: Option<&mut RTSPToken>);
-
-    fn connect_accept_certificate<
-        F: Fn(
-                &Self,
-                &gio::TlsConnection,
-                &gio::TlsCertificate,
-                gio::TlsCertificateFlags,
-            ) -> Result<(), gst::LoggableError>
-            + Send
-            + Sync
-            + 'static,
-    >(
-        &self,
-        f: F,
-    ) -> SignalHandlerId;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::RTSPAuth>> Sealed for T {}
 }
 
-impl<O: IsA<RTSPAuth>> RTSPAuthExtManual for O {
+pub trait RTSPAuthExtManual: sealed::Sealed + IsA<RTSPAuth> + 'static {
+    #[doc(alias = "gst_rtsp_auth_set_default_token")]
     fn set_default_token(&self, mut token: Option<&mut RTSPToken>) {
         unsafe {
             ffi::gst_rtsp_auth_set_default_token(
@@ -68,6 +54,8 @@ impl<O: IsA<RTSPAuth>> RTSPAuthExtManual for O {
     }
 }
 
+impl<O: IsA<RTSPAuth>> RTSPAuthExtManual for O {}
+
 unsafe extern "C" fn accept_certificate_trampoline<
     P,
     F: Fn(

gstreamer-rtsp-server/src/rtsp_client.rs

@@ -4,12 +4,13 @@ use glib::{prelude::*, source::SourceId, translate::*};
 
 use crate::RTSPClient;
 
-pub trait RTSPClientExtManual: 'static {
-    #[doc(alias = "gst_rtsp_client_attach")]
-    fn attach(&self, context: Option<&glib::MainContext>) -> SourceId;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::RTSPClient>> Sealed for T {}
 }
 
-impl<O: IsA<RTSPClient>> RTSPClientExtManual for O {
+pub trait RTSPClientExtManual: sealed::Sealed + IsA<RTSPClient> + 'static {
+    #[doc(alias = "gst_rtsp_client_attach")]
     fn attach(&self, context: Option<&glib::MainContext>) -> SourceId {
         unsafe {
             from_glib(ffi::gst_rtsp_client_attach(
@@ -19,3 +20,5 @@ impl<O: IsA<RTSPClient>> RTSPClientExtManual for O {
         }
     }
 }
+
+impl<O: IsA<RTSPClient>> RTSPClientExtManual for O {}

gstreamer-rtsp-server/src/rtsp_media.rs

@@ -4,12 +4,13 @@ use glib::{prelude::*, translate::*};
 
 use crate::RTSPMedia;
 
-pub trait RTSPMediaExtManual: 'static {
-    #[doc(alias = "gst_rtsp_media_take_pipeline")]
-    fn take_pipeline(&self, pipeline: impl IsA<gst::Pipeline>);
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::RTSPMedia>> Sealed for T {}
 }
 
-impl<O: IsA<RTSPMedia>> RTSPMediaExtManual for O {
+pub trait RTSPMediaExtManual: sealed::Sealed + IsA<RTSPMedia> + 'static {
+    #[doc(alias = "gst_rtsp_media_take_pipeline")]
     fn take_pipeline(&self, pipeline: impl IsA<gst::Pipeline>) {
         unsafe {
             let pipeline = pipeline.upcast().into_glib_ptr();
@@ -22,3 +23,5 @@ impl<O: IsA<RTSPMedia>> RTSPMediaExtManual for O {
         }
     }
 }
+
+impl<O: IsA<RTSPMedia>> RTSPMediaExtManual for O {}

gstreamer-rtsp-server/src/rtsp_media_factory.rs

@@ -4,12 +4,13 @@ use glib::{prelude::*, translate::*};
 
 use crate::RTSPMediaFactory;
 
-pub trait RTSPMediaFactoryExtManual: 'static {
-    #[doc(alias = "gst_rtsp_media_factory_add_role_from_structure")]
-    fn add_role_from_structure(&self, structure: &gst::StructureRef);
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::RTSPMediaFactory>> Sealed for T {}
 }
 
-impl<O: IsA<RTSPMediaFactory>> RTSPMediaFactoryExtManual for O {
+pub trait RTSPMediaFactoryExtManual: sealed::Sealed + IsA<RTSPMediaFactory> + 'static {
+    #[doc(alias = "gst_rtsp_media_factory_add_role_from_structure")]
     fn add_role_from_structure(&self, structure: &gst::StructureRef) {
         unsafe {
             ffi::gst_rtsp_media_factory_add_role_from_structure(
@@ -19,3 +20,5 @@ impl<O: IsA<RTSPMediaFactory>> RTSPMediaFactoryExtManual for O {
         }
     }
 }
+
+impl<O: IsA<RTSPMediaFactory>> RTSPMediaFactoryExtManual for O {}

gstreamer-rtsp-server/src/rtsp_onvif_media_factory.rs

@@ -4,12 +4,15 @@ use glib::{prelude::*, translate::*};
 
 use crate::{RTSPContext, RTSPOnvifMediaFactory};
 
-pub trait RTSPOnvifMediaFactoryExtManual: 'static {
-    #[doc(alias = "gst_rtsp_onvif_media_factory_requires_backchannel")]
-    fn requires_backchannel(&self, ctx: &RTSPContext) -> bool;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::RTSPOnvifMediaFactory>> Sealed for T {}
 }
 
-impl<O: IsA<RTSPOnvifMediaFactory>> RTSPOnvifMediaFactoryExtManual for O {
+pub trait RTSPOnvifMediaFactoryExtManual:
+    sealed::Sealed + IsA<RTSPOnvifMediaFactory> + 'static
+{
+    #[doc(alias = "gst_rtsp_onvif_media_factory_requires_backchannel")]
     fn requires_backchannel(&self, ctx: &RTSPContext) -> bool {
         skip_assert_initialized!();
         unsafe {
@@ -23,3 +26,5 @@ impl<O: IsA<RTSPOnvifMediaFactory>> RTSPOnvifMediaFactoryExtManual for O {
         }
     }
 }
+
+impl<O: IsA<RTSPOnvifMediaFactory>> RTSPOnvifMediaFactoryExtManual for O {}

gstreamer-rtsp-server/src/rtsp_server.rs

@@ -4,15 +4,13 @@ use glib::{prelude::*, source::SourceId, translate::*};
 
 use crate::RTSPServer;
 
-pub trait RTSPServerExtManual: 'static {
-    #[doc(alias = "gst_rtsp_server_attach")]
-    fn attach(
-        &self,
-        context: Option<&glib::MainContext>,
-    ) -> Result<SourceId, glib::error::BoolError>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::RTSPServer>> Sealed for T {}
 }
 
-impl<O: IsA<RTSPServer>> RTSPServerExtManual for O {
+pub trait RTSPServerExtManual: sealed::Sealed + IsA<RTSPServer> + 'static {
+    #[doc(alias = "gst_rtsp_server_attach")]
     fn attach(
         &self,
         context: Option<&glib::MainContext>,
@@ -30,3 +28,5 @@ impl<O: IsA<RTSPServer>> RTSPServerExtManual for O {
         }
     }
 }
+
+impl<O: IsA<RTSPServer>> RTSPServerExtManual for O {}

gstreamer-rtsp-server/src/rtsp_session.rs

@@ -6,13 +6,14 @@ use glib::{prelude::*, translate::*};
 
 use crate::{RTSPSession, RTSPSessionMedia};
 
-pub trait RTSPSessionExtManual: 'static {
-    #[doc(alias = "gst_rtsp_session_dup_media")]
-    #[doc(alias = "gst_rtsp_session_get_media")]
-    fn media(&self, path: &str) -> (Option<RTSPSessionMedia>, i32);
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::RTSPSession>> Sealed for T {}
 }
 
-impl<O: IsA<RTSPSession>> RTSPSessionExtManual for O {
+pub trait RTSPSessionExtManual: sealed::Sealed + IsA<super::RTSPSession> + 'static {
+    #[doc(alias = "gst_rtsp_session_dup_media")]
+    #[doc(alias = "gst_rtsp_session_get_media")]
     fn media(&self, path: &str) -> (Option<RTSPSessionMedia>, i32) {
         #[cfg(feature = "v1_20")]
         unsafe {
@@ -36,3 +37,5 @@ impl<O: IsA<RTSPSession>> RTSPSessionExtManual for O {
         }
     }
 }
+
+impl<O: IsA<RTSPSession>> RTSPSessionExtManual for O {}

gstreamer-rtsp-server/src/rtsp_session_pool.rs

@@ -33,14 +33,13 @@ fn into_raw_watch<F: FnMut(&RTSPSessionPool) -> Continue + Send + 'static>(func:
     Box::into_raw(func) as gpointer
 }
 
-pub trait RTSPSessionPoolExtManual: 'static {
-    #[doc(alias = "gst_rtsp_session_pool_create_watch")]
-    fn create_watch<F>(&self, name: Option<&str>, priority: Priority, func: F) -> glib::Source
-    where
-        F: FnMut(&RTSPSessionPool) -> Continue + Send + 'static;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::RTSPSessionPool>> Sealed for T {}
 }
 
-impl<O: IsA<RTSPSessionPool>> RTSPSessionPoolExtManual for O {
+pub trait RTSPSessionPoolExtManual: sealed::Sealed + IsA<RTSPSessionPool> + 'static {
+    #[doc(alias = "gst_rtsp_session_pool_create_watch")]
     fn create_watch<F>(&self, name: Option<&str>, priority: Priority, func: F) -> glib::Source
     where
         F: FnMut(&RTSPSessionPool) -> Continue + Send + 'static,
@@ -67,3 +66,5 @@ impl<O: IsA<RTSPSessionPool>> RTSPSessionPoolExtManual for O {
         }
     }
 }
+
+impl<O: IsA<RTSPSessionPool>> RTSPSessionPoolExtManual for O {}

gstreamer-rtsp-server/src/subclass/rtsp_client.rs

@@ -155,102 +155,12 @@ pub trait RTSPClientImpl: RTSPClientImplExt + ObjectImpl + Send + Sync {
     }
 }
 
-pub trait RTSPClientImplExt: ObjectSubclass {
-    fn parent_create_sdp(&self, media: &crate::RTSPMedia) -> Option<gst_sdp::SDPMessage>;
-
-    fn parent_configure_client_media(
-        &self,
-        media: &crate::RTSPMedia,
-        stream: &crate::RTSPStream,
-        ctx: &crate::RTSPContext,
-    ) -> Result<(), gst::LoggableError>;
-
-    // TODO: configure_client_transport
-
-    fn parent_params_set(&self, ctx: &crate::RTSPContext) -> gst_rtsp::RTSPResult;
-
-    fn parent_params_get(&self, ctx: &crate::RTSPContext) -> gst_rtsp::RTSPResult;
-
-    fn parent_make_path_from_uri(&self, url: &gst_rtsp::RTSPUrl) -> Option<glib::GString>;
-
-    fn parent_closed(&self);
-
-    fn parent_new_session(&self, session: &crate::RTSPSession);
-
-    fn parent_options_request(&self, ctx: &crate::RTSPContext);
-
-    fn parent_describe_request(&self, ctx: &crate::RTSPContext);
-
-    fn parent_setup_request(&self, ctx: &crate::RTSPContext);
-
-    fn parent_play_request(&self, ctx: &crate::RTSPContext);
-
-    fn parent_pause_request(&self, ctx: &crate::RTSPContext);
-
-    fn parent_teardown_request(&self, ctx: &crate::RTSPContext);
-
-    fn parent_set_parameter_request(&self, ctx: &crate::RTSPContext);
-
-    fn parent_parameter_request(&self, ctx: &crate::RTSPContext);
-
-    fn parent_announce_request(&self, ctx: &crate::RTSPContext);
-
-    fn parent_record_request(&self, ctx: &crate::RTSPContext);
-
-    fn parent_handle_response(&self, ctx: &crate::RTSPContext);
-
-    // TODO: tunnel_http_response
-    // TODO: send_message
-
-    fn parent_handle_sdp(
-        &self,
-        ctx: &crate::RTSPContext,
-        media: &crate::RTSPMedia,
-        sdp: &gst_sdp::SDPMessageRef,
-    ) -> Result<(), gst::LoggableError>;
-
-    fn parent_check_requirements(
-        &self,
-        ctx: &crate::RTSPContext,
-        arr: &[String],
-    ) -> Option<glib::GString>;
-
-    fn parent_pre_options_request(&self, ctx: &crate::RTSPContext) -> gst_rtsp::RTSPStatusCode;
-
-    fn parent_pre_describe_request(&self, ctx: &crate::RTSPContext) -> gst_rtsp::RTSPStatusCode;
-
-    fn parent_pre_setup_request(&self, ctx: &crate::RTSPContext) -> gst_rtsp::RTSPStatusCode;
-
-    fn parent_pre_play_request(&self, ctx: &crate::RTSPContext) -> gst_rtsp::RTSPStatusCode;
-
-    fn parent_pre_pause_request(&self, ctx: &crate::RTSPContext) -> gst_rtsp::RTSPStatusCode;
-
-    fn parent_pre_teardown_request(&self, ctx: &crate::RTSPContext) -> gst_rtsp::RTSPStatusCode;
-
-    fn parent_pre_set_parameter_request(
-        &self,
-        ctx: &crate::RTSPContext,
-    ) -> gst_rtsp::RTSPStatusCode;
-
-    fn parent_pre_get_parameter_request(
-        &self,
-        ctx: &crate::RTSPContext,
-    ) -> gst_rtsp::RTSPStatusCode;
-
-    fn parent_pre_announce_request(&self, ctx: &crate::RTSPContext) -> gst_rtsp::RTSPStatusCode;
-
-    fn parent_pre_record_request(&self, ctx: &crate::RTSPContext) -> gst_rtsp::RTSPStatusCode;
-
-    #[cfg(feature = "v1_22")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_22")))]
-    fn parent_adjust_error_code(
-        &self,
-        ctx: &crate::RTSPContext,
-        status_code: gst_rtsp::RTSPStatusCode,
-    ) -> gst_rtsp::RTSPStatusCode;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::RTSPClientImplExt> Sealed for T {}
 }
 
-impl<T: RTSPClientImpl> RTSPClientImplExt for T {
+pub trait RTSPClientImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_create_sdp(&self, media: &crate::RTSPMedia) -> Option<gst_sdp::SDPMessage> {
         unsafe {
             let data = Self::type_data();
@@ -732,6 +642,9 @@ impl<T: RTSPClientImpl> RTSPClientImplExt for T {
         }
     }
 }
+
+impl<T: RTSPClientImpl> RTSPClientImplExt for T {}
+
 unsafe impl<T: RTSPClientImpl> IsSubclassable<T> for RTSPClient {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-rtsp-server/src/subclass/rtsp_media.rs

@@ -98,33 +98,12 @@ pub trait RTSPMediaImpl: RTSPMediaImplExt + ObjectImpl + Send + Sync {
     }
 }
 
-pub trait RTSPMediaImplExt: ObjectSubclass {
-    fn parent_handle_message(&self, message: &gst::MessageRef) -> bool;
-    fn parent_prepare(&self, thread: &RTSPThread) -> Result<(), gst::LoggableError>;
-    fn parent_unprepare(&self) -> Result<(), gst::LoggableError>;
-    fn parent_suspend(&self) -> Result<(), gst::LoggableError>;
-    fn parent_unsuspend(&self) -> Result<(), gst::LoggableError>;
-    // TODO missing: convert_range
-
-    fn parent_query_position(&self) -> Option<gst::ClockTime>;
-    fn parent_query_stop(&self) -> Option<gst::ClockTime>;
-    fn parent_create_rtpbin(&self) -> Option<gst::Element>;
-    fn parent_setup_rtpbin(&self, rtpbin: &gst::Element) -> Result<(), gst::LoggableError>;
-    fn parent_setup_sdp(
-        &self,
-        sdp: &mut gst_sdp::SDPMessageRef,
-        info: &SDPInfo,
-    ) -> Result<(), gst::LoggableError>;
-    fn parent_new_stream(&self, stream: &crate::RTSPStream);
-    fn parent_removed_stream(&self, stream: &crate::RTSPStream);
-    fn parent_prepared(&self);
-    fn parent_unprepared(&self);
-    fn parent_target_state(&self, state: gst::State);
-    fn parent_new_state(&self, state: gst::State);
-    fn parent_handle_sdp(&self, sdp: &gst_sdp::SDPMessageRef) -> Result<(), gst::LoggableError>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::RTSPMediaImplExt> Sealed for T {}
 }
 
-impl<T: RTSPMediaImpl> RTSPMediaImplExt for T {
+pub trait RTSPMediaImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_handle_message(&self, message: &gst::MessageRef) -> bool {
         unsafe {
             let data = Self::type_data();
@@ -208,7 +187,6 @@ impl<T: RTSPMediaImpl> RTSPMediaImplExt for T {
     }
 
     // TODO missing: convert_range
-
     fn parent_query_position(&self) -> Option<gst::ClockTime> {
         unsafe {
             use std::mem;
@@ -419,6 +397,9 @@ impl<T: RTSPMediaImpl> RTSPMediaImplExt for T {
         }
     }
 }
+
+impl<T: RTSPMediaImpl> RTSPMediaImplExt for T {}
+
 unsafe impl<T: RTSPMediaImpl> IsSubclassable<T> for RTSPMedia {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-rtsp-server/src/subclass/rtsp_media_factory.rs

@@ -36,22 +36,12 @@ pub trait RTSPMediaFactoryImpl: RTSPMediaFactoryImplExt + ObjectImpl + Send + Sy
     }
 }
 
-pub trait RTSPMediaFactoryImplExt: ObjectSubclass {
-    fn parent_gen_key(&self, url: &gst_rtsp::RTSPUrl) -> Option<glib::GString>;
-
-    fn parent_create_element(&self, url: &gst_rtsp::RTSPUrl) -> Option<gst::Element>;
-
-    fn parent_construct(&self, url: &gst_rtsp::RTSPUrl) -> Option<crate::RTSPMedia>;
-
-    fn parent_create_pipeline(&self, media: &crate::RTSPMedia) -> Option<gst::Pipeline>;
-
-    fn parent_configure(&self, media: &crate::RTSPMedia);
-
-    fn parent_media_constructed(&self, media: &crate::RTSPMedia);
-    fn parent_media_configure(&self, media: &crate::RTSPMedia);
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::RTSPMediaFactoryImplExt> Sealed for T {}
 }
 
-impl<T: RTSPMediaFactoryImpl> RTSPMediaFactoryImplExt for T {
+pub trait RTSPMediaFactoryImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_gen_key(&self, url: &gst_rtsp::RTSPUrl) -> Option<glib::GString> {
         unsafe {
             let data = Self::type_data();
@@ -182,6 +172,8 @@ impl<T: RTSPMediaFactoryImpl> RTSPMediaFactoryImplExt for T {
         }
     }
 }
+
+impl<T: RTSPMediaFactoryImpl> RTSPMediaFactoryImplExt for T {}
 unsafe impl<T: RTSPMediaFactoryImpl> IsSubclassable<T> for RTSPMediaFactory {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-rtsp-server/src/subclass/rtsp_mount_points.rs

@@ -11,11 +11,12 @@ pub trait RTSPMountPointsImpl: RTSPMountPointsImplExt + ObjectImpl + Send + Sync
     }
 }
 
-pub trait RTSPMountPointsImplExt: ObjectSubclass {
-    fn parent_make_path(&self, url: &gst_rtsp::RTSPUrl) -> Option<glib::GString>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::RTSPMountPointsImplExt> Sealed for T {}
 }
 
-impl<T: RTSPMountPointsImpl> RTSPMountPointsImplExt for T {
+pub trait RTSPMountPointsImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_make_path(&self, url: &gst_rtsp::RTSPUrl) -> Option<glib::GString> {
         unsafe {
             let data = Self::type_data();
@@ -34,6 +35,8 @@ impl<T: RTSPMountPointsImpl> RTSPMountPointsImplExt for T {
     }
 }
 
+impl<T: RTSPMountPointsImpl> RTSPMountPointsImplExt for T {}
+
 unsafe impl<T: RTSPMountPointsImpl> IsSubclassable<T> for RTSPMountPoints {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-rtsp-server/src/subclass/rtsp_onvif_media_factory.rs

@@ -13,11 +13,12 @@ pub trait RTSPOnvifMediaFactoryImpl:
     }
 }
 
-pub trait RTSPOnvifMediaFactoryImplExt: ObjectSubclass {
-    fn parent_has_backchannel_support(&self) -> bool;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::RTSPOnvifMediaFactoryImplExt> Sealed for T {}
 }
 
-impl<T: RTSPOnvifMediaFactoryImpl> RTSPOnvifMediaFactoryImplExt for T {
+pub trait RTSPOnvifMediaFactoryImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_has_backchannel_support(&self) -> bool {
         unsafe {
             let data = Self::type_data();
@@ -37,6 +38,8 @@ impl<T: RTSPOnvifMediaFactoryImpl> RTSPOnvifMediaFactoryImplExt for T {
     }
 }
 
+impl<T: RTSPOnvifMediaFactoryImpl> RTSPOnvifMediaFactoryImplExt for T {}
+
 unsafe impl<T: RTSPOnvifMediaFactoryImpl> IsSubclassable<T> for RTSPOnvifMediaFactory {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-rtsp-server/src/subclass/rtsp_server.rs

@@ -14,7 +14,12 @@ pub trait RTSPServerImpl: RTSPServerImplExt + ObjectImpl + Send + Sync {
     }
 }
 
-pub trait RTSPServerImplExt: ObjectSubclass {
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::RTSPServerImplExt> Sealed for T {}
+}
+
+pub trait RTSPServerImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_create_client(&self) -> Option<crate::RTSPClient>;
 
     fn parent_client_connected(&self, client: &crate::RTSPClient);

gstreamer-video/src/subclass/navigation.rs

@@ -16,19 +16,12 @@ pub trait NavigationImpl: ObjectImpl {
     }
 }
 
-pub trait NavigationImplExt: ObjectSubclass {
-    fn parent_send_event(&self, structure: gst::Structure);
-
-    #[cfg(feature = "v1_22")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_22")))]
-    fn parent_send_event_simple(&self, event: gst::Event) {
-        if let Some(structure) = event.structure() {
-            self.parent_send_event(structure.to_owned());
-        }
-    }
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::NavigationImplExt> Sealed for T {}
 }
 
-impl<T: NavigationImpl> NavigationImplExt for T {
+pub trait NavigationImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_send_event(&self, structure: gst::Structure) {
         unsafe {
             let type_data = Self::type_data();
@@ -68,6 +61,8 @@ impl<T: NavigationImpl> NavigationImplExt for T {
     }
 }
 
+impl<T: NavigationImpl> NavigationImplExt for T {}
+
 unsafe impl<T: NavigationImpl> IsImplementable<T> for Navigation {
     #[cfg(not(any(feature = "v1_22", docsrs)))]
     fn interface_init(iface: &mut glib::Interface<Self>) {

gstreamer-video/src/subclass/video_aggregator.rs

@@ -30,25 +30,12 @@ pub trait VideoAggregatorImpl: VideoAggregatorImplExt + AggregatorImpl {
         self.parent_find_best_format(downstream_caps)
     }
 }
-
-pub trait VideoAggregatorImplExt: ObjectSubclass {
-    fn parent_update_caps(&self, caps: &gst::Caps) -> Result<gst::Caps, gst::LoggableError>;
-
-    fn parent_aggregate_frames(
-        &self,
-        token: &AggregateFramesToken,
-        outbuf: &mut gst::BufferRef,
-    ) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_create_output_buffer(&self) -> Result<Option<gst::Buffer>, gst::FlowError>;
-
-    fn parent_find_best_format(
-        &self,
-        downstream_caps: &gst::Caps,
-    ) -> Option<(crate::VideoInfo, bool)>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::VideoAggregatorImplExt> Sealed for T {}
 }
 
-impl<T: VideoAggregatorImpl> VideoAggregatorImplExt for T {
+pub trait VideoAggregatorImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_update_caps(&self, caps: &gst::Caps) -> Result<gst::Caps, gst::LoggableError> {
         unsafe {
             let data = Self::type_data();
@@ -155,6 +142,8 @@ impl<T: VideoAggregatorImpl> VideoAggregatorImplExt for T {
     }
 }
 
+impl<T: VideoAggregatorImpl> VideoAggregatorImplExt for T {}
+
 unsafe impl<T: VideoAggregatorImpl> IsSubclassable<T> for VideoAggregator {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-video/src/subclass/video_aggregator_pad.rs

@@ -31,25 +31,12 @@ pub trait VideoAggregatorPadImpl: VideoAggregatorPadImplExt + AggregatorPadImpl
     }
 }
 
-pub trait VideoAggregatorPadImplExt: ObjectSubclass {
-    fn parent_update_conversion_info(&self);
-
-    fn parent_prepare_frame(
-        &self,
-        aggregator: &crate::VideoAggregator,
-        token: &AggregateFramesToken,
-        buffer: &gst::Buffer,
-    ) -> Option<crate::VideoFrame<crate::video_frame::Readable>>;
-
-    fn parent_clean_frame(
-        &self,
-        aggregator: &crate::VideoAggregator,
-        token: &AggregateFramesToken,
-        frame: Option<crate::VideoFrame<crate::video_frame::Readable>>,
-    );
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::VideoAggregatorPadImplExt> Sealed for T {}
 }
 
-impl<T: VideoAggregatorPadImpl> VideoAggregatorPadImplExt for T {
+pub trait VideoAggregatorPadImplExt: ObjectSubclass {
     fn parent_update_conversion_info(&self) {
         unsafe {
             let data = Self::type_data();
@@ -137,6 +124,8 @@ impl<T: VideoAggregatorPadImpl> VideoAggregatorPadImplExt for T {
     }
 }
 
+impl<T: VideoAggregatorPadImpl> VideoAggregatorPadImplExt for T {}
+
 unsafe impl<T: VideoAggregatorPadImpl> IsSubclassable<T> for VideoAggregatorPad {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-video/src/subclass/video_decoder.rs

@@ -106,71 +106,11 @@ pub trait VideoDecoderImpl: VideoDecoderImplExt + ElementImpl {
         self.parent_handle_missing_data(timestamp, duration)
     }
 }
-
-pub trait VideoDecoderImplExt: ObjectSubclass {
-    fn parent_open(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_close(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_start(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_stop(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_finish(&self) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_drain(&self) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_set_format(
-        &self,
-        state: &VideoCodecState<'static, Readable>,
-    ) -> Result<(), gst::LoggableError>;
-
-    fn parent_parse(
-        &self,
-        frame: &VideoCodecFrame,
-        adapter: &gst_base::Adapter,
-        at_eos: bool,
-    ) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_handle_frame(
-        &self,
-        frame: VideoCodecFrame,
-    ) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_flush(&self) -> bool;
-
-    fn parent_negotiate(&self) -> Result<(), gst::LoggableError>;
-
-    fn parent_caps(&self, filter: Option<&gst::Caps>) -> gst::Caps;
-
-    fn parent_sink_event(&self, event: gst::Event) -> bool;
-
-    fn parent_sink_query(&self, query: &mut gst::QueryRef) -> bool;
-
-    fn parent_src_event(&self, event: gst::Event) -> bool;
-
-    fn parent_src_query(&self, query: &mut gst::QueryRef) -> bool;
-
-    fn parent_propose_allocation(
-        &self,
-        query: &mut gst::query::Allocation,
-    ) -> Result<(), gst::LoggableError>;
-
-    fn parent_decide_allocation(
-        &self,
-        query: &mut gst::query::Allocation,
-    ) -> Result<(), gst::LoggableError>;
-
-    #[cfg(feature = "v1_20")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_20")))]
-    fn parent_handle_missing_data(
-        &self,
-        timestamp: gst::ClockTime,
-        duration: Option<gst::ClockTime>,
-    ) -> bool;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::VideoDecoderImplExt> Sealed for T {}
 }
-
-impl<T: VideoDecoderImpl> VideoDecoderImplExt for T {
+pub trait VideoDecoderImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_open(&self) -> Result<(), gst::ErrorMessage> {
         unsafe {
             let data = Self::type_data();
@@ -587,6 +527,8 @@ impl<T: VideoDecoderImpl> VideoDecoderImplExt for T {
     }
 }
 
+impl<T: VideoDecoderImpl> VideoDecoderImplExt for T {}
+
 unsafe impl<T: VideoDecoderImpl> IsSubclassable<T> for VideoDecoder {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-video/src/subclass/video_encoder.rs

@@ -84,53 +84,12 @@ pub trait VideoEncoderImpl: VideoEncoderImplExt + ElementImpl {
     }
 }
 
-pub trait VideoEncoderImplExt: ObjectSubclass {
-    fn parent_open(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_close(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_start(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_stop(&self) -> Result<(), gst::ErrorMessage>;
-
-    fn parent_finish(&self) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_set_format(
-        &self,
-        state: &VideoCodecState<'static, Readable>,
-    ) -> Result<(), gst::LoggableError>;
-
-    fn parent_handle_frame(
-        &self,
-        frame: VideoCodecFrame,
-    ) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_flush(&self) -> bool;
-
-    fn parent_negotiate(&self) -> Result<(), gst::LoggableError>;
-
-    fn parent_caps(&self, filter: Option<&gst::Caps>) -> gst::Caps;
-
-    fn parent_sink_event(&self, event: gst::Event) -> bool;
-
-    fn parent_sink_query(&self, query: &mut gst::QueryRef) -> bool;
-
-    fn parent_src_event(&self, event: gst::Event) -> bool;
-
-    fn parent_src_query(&self, query: &mut gst::QueryRef) -> bool;
-
-    fn parent_propose_allocation(
-        &self,
-        query: &mut gst::query::Allocation,
-    ) -> Result<(), gst::LoggableError>;
-
-    fn parent_decide_allocation(
-        &self,
-        query: &mut gst::query::Allocation,
-    ) -> Result<(), gst::LoggableError>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::VideoEncoderImplExt> Sealed for T {}
 }
 
-impl<T: VideoEncoderImpl> VideoEncoderImplExt for T {
+pub trait VideoEncoderImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_open(&self) -> Result<(), gst::ErrorMessage> {
         unsafe {
             let data = Self::type_data();
@@ -478,6 +437,8 @@ impl<T: VideoEncoderImpl> VideoEncoderImplExt for T {
     }
 }
 
+impl<T: VideoEncoderImpl> VideoEncoderImplExt for T {}
+
 unsafe impl<T: VideoEncoderImpl> IsSubclassable<T> for VideoEncoder {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-video/src/subclass/video_filter.rs

@@ -39,33 +39,12 @@ pub trait VideoFilterImpl: VideoFilterImplExt + BaseTransformImpl {
     }
 }
 
-pub trait VideoFilterImplExt: ObjectSubclass {
-    fn parent_set_info(
-        &self,
-        incaps: &gst::Caps,
-        in_info: &VideoInfo,
-        outcaps: &gst::Caps,
-        out_info: &VideoInfo,
-    ) -> Result<(), gst::LoggableError>;
-
-    fn parent_transform_frame(
-        &self,
-        inframe: &VideoFrameRef<&gst::BufferRef>,
-        outframe: &mut VideoFrameRef<&mut gst::BufferRef>,
-    ) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_transform_frame_ip(
-        &self,
-        frame: &mut VideoFrameRef<&mut gst::BufferRef>,
-    ) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn parent_transform_frame_ip_passthrough(
-        &self,
-        frame: &VideoFrameRef<&gst::BufferRef>,
-    ) -> Result<gst::FlowSuccess, gst::FlowError>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::VideoFilterImplExt> Sealed for T {}
 }
 
-impl<T: VideoFilterImpl> VideoFilterImplExt for T {
+pub trait VideoFilterImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_set_info(
         &self,
         incaps: &gst::Caps,
@@ -192,6 +171,8 @@ impl<T: VideoFilterImpl> VideoFilterImplExt for T {
     }
 }
 
+impl<T: VideoFilterImpl> VideoFilterImplExt for T {}
+
 unsafe impl<T: VideoFilterImpl> IsSubclassable<T> for VideoFilter {
     fn class_init(klass: &mut glib::Class<Self>) {
         use gst_base::subclass::base_transform::BaseTransformMode;

gstreamer-video/src/subclass/video_sink.rs

@@ -11,11 +11,12 @@ pub trait VideoSinkImpl: VideoSinkImplExt + BaseSinkImpl + ElementImpl {
     }
 }
 
-pub trait VideoSinkImplExt: ObjectSubclass {
-    fn parent_show_frame(&self, buffer: &gst::Buffer) -> Result<gst::FlowSuccess, gst::FlowError>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::VideoSinkImplExt> Sealed for T {}
 }
 
-impl<T: VideoSinkImpl> VideoSinkImplExt for T {
+pub trait VideoSinkImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_show_frame(&self, buffer: &gst::Buffer) -> Result<gst::FlowSuccess, gst::FlowError> {
         unsafe {
             let data = Self::type_data();
@@ -33,6 +34,8 @@ impl<T: VideoSinkImpl> VideoSinkImplExt for T {
     }
 }
 
+impl<T: VideoSinkImpl> VideoSinkImplExt for T {}
+
 unsafe impl<T: VideoSinkImpl> IsSubclassable<T> for VideoSink {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer-video/src/video_aggregator.rs

@@ -3,11 +3,12 @@ use gst::prelude::*;
 
 use crate::auto::VideoAggregator;
 
-pub trait VideoAggregatorExtManual: 'static {
-    fn video_info(&self) -> Option<crate::VideoInfo>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::VideoAggregator>> Sealed for T {}
 }
 
-impl<O: IsA<VideoAggregator>> VideoAggregatorExtManual for O {
+pub trait VideoAggregatorExtManual: sealed::Sealed + IsA<VideoAggregator> + 'static {
     fn video_info(&self) -> Option<crate::VideoInfo> {
         unsafe {
             let ptr = self.as_ptr() as *mut ffi::GstVideoAggregator;
@@ -25,3 +26,5 @@ impl<O: IsA<VideoAggregator>> VideoAggregatorExtManual for O {
         }
     }
 }
+
+impl<O: IsA<VideoAggregator>> VideoAggregatorExtManual for O {}

gstreamer-video/src/video_aggregator_convert_pad.rs

@@ -9,26 +9,21 @@ use glib::{
 
 use crate::auto::VideoAggregatorConvertPad;
 
-pub trait VideoAggregatorConvertPadExtManual: 'static {
-    #[doc(alias = "converter-config")]
-    fn converter_config(&self) -> Option<crate::VideoConverterConfig>;
-
-    #[doc(alias = "converter-config")]
-    fn set_converter_config(&self, converter_config: Option<&crate::VideoConverterConfig>);
-
-    #[doc(alias = "converter-config")]
-    fn connect_converter_config_notify<F: Fn(&Self) + Send + Sync + 'static>(
-        &self,
-        f: F,
-    ) -> SignalHandlerId;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::VideoAggregatorConvertPad>> Sealed for T {}
 }
 
-impl<O: IsA<VideoAggregatorConvertPad>> VideoAggregatorConvertPadExtManual for O {
+pub trait VideoAggregatorConvertPadExtManual:
+    sealed::Sealed + IsA<VideoAggregatorConvertPad> + 'static
+{
+    #[doc(alias = "converter-config")]
     fn converter_config(&self) -> Option<crate::VideoConverterConfig> {
         glib::ObjectExt::property::<Option<gst::Structure>>(self.as_ref(), "converter-config")
             .map(|c| c.try_into().unwrap())
     }
 
+    #[doc(alias = "converter-config")]
     fn set_converter_config(&self, converter_config: Option<&crate::VideoConverterConfig>) {
         glib::ObjectExt::set_property(
             self.as_ref(),
@@ -37,6 +32,7 @@ impl<O: IsA<VideoAggregatorConvertPad>> VideoAggregatorConvertPadExtManual for O
         )
     }
 
+    #[doc(alias = "converter-config")]
     fn connect_converter_config_notify<F: Fn(&Self) + Send + Sync + 'static>(
         &self,
         f: F,
@@ -65,3 +61,5 @@ impl<O: IsA<VideoAggregatorConvertPad>> VideoAggregatorConvertPadExtManual for O
         }
     }
 }
+
+impl<O: IsA<VideoAggregatorConvertPad>> VideoAggregatorConvertPadExtManual for O {}

gstreamer-video/src/video_aggregator_pad.rs

@@ -3,23 +3,13 @@ use gst::prelude::*;
 
 use crate::{auto::VideoAggregatorPad, subclass::AggregateFramesToken};
 
-pub trait VideoAggregatorPadExtManual: 'static {
-    #[doc(alias = "gst_video_aggregator_pad_has_current_buffer")]
-    fn has_current_buffer(&self, token: &AggregateFramesToken) -> bool;
-
-    #[doc(alias = "gst_video_aggregator_pad_get_current_buffer")]
-    fn current_buffer(&self, token: &AggregateFramesToken) -> Option<gst::Buffer>;
-
-    #[doc(alias = "gst_video_aggregator_pad_get_prepared_frame")]
-    fn prepared_frame<'a>(
-        &self,
-        token: &'a AggregateFramesToken,
-    ) -> Option<crate::VideoFrameRef<&'a gst::BufferRef>>;
-
-    fn video_info(&self) -> Option<crate::VideoInfo>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::VideoAggregatorPad>> Sealed for T {}
 }
 
-impl<O: IsA<VideoAggregatorPad>> VideoAggregatorPadExtManual for O {
+pub trait VideoAggregatorPadExtManual: sealed::Sealed + IsA<VideoAggregatorPad> + 'static {
+    #[doc(alias = "gst_video_aggregator_pad_has_current_buffer")]
     fn has_current_buffer(&self, _token: &AggregateFramesToken) -> bool {
         unsafe {
             from_glib(ffi::gst_video_aggregator_pad_has_current_buffer(
@@ -28,6 +18,7 @@ impl<O: IsA<VideoAggregatorPad>> VideoAggregatorPadExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_video_aggregator_pad_get_current_buffer")]
     fn current_buffer(&self, _token: &AggregateFramesToken) -> Option<gst::Buffer> {
         unsafe {
             from_glib_none(ffi::gst_video_aggregator_pad_get_current_buffer(
@@ -36,6 +27,7 @@ impl<O: IsA<VideoAggregatorPad>> VideoAggregatorPadExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_video_aggregator_pad_get_prepared_frame")]
     fn prepared_frame<'a>(
         &self,
         _token: &'a AggregateFramesToken,
@@ -69,3 +61,5 @@ impl<O: IsA<VideoAggregatorPad>> VideoAggregatorPadExtManual for O {
         }
     }
 }
+
+impl<O: IsA<VideoAggregatorPad>> VideoAggregatorPadExtManual for O {}

gstreamer-video/src/video_decoder.rs

@@ -27,75 +27,12 @@ extern "C" {
     ) -> gst::ffi::GstFlowReturn;
 }
 
-pub trait VideoDecoderExtManual: 'static {
-    #[doc(alias = "gst_video_decoder_allocate_output_frame")]
-    fn allocate_output_frame(
-        &self,
-        frame: &mut VideoCodecFrame,
-        params: Option<&gst::BufferPoolAcquireParams>,
-    ) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    #[doc(alias = "get_frame")]
-    fn frame(&self, frame_number: i32) -> Option<VideoCodecFrame>;
-    #[doc(alias = "get_frames")]
-    fn frames(&self) -> Vec<VideoCodecFrame>;
-    #[doc(alias = "get_oldest_frame")]
-    fn oldest_frame(&self) -> Option<VideoCodecFrame>;
-
-    #[doc(alias = "get_allocator")]
-    fn allocator(&self) -> (Option<gst::Allocator>, gst::AllocationParams);
-
-    #[doc(alias = "get_latency")]
-    fn latency(&self) -> (gst::ClockTime, Option<gst::ClockTime>);
-    fn set_latency(
-        &self,
-        min_latency: gst::ClockTime,
-        max_latency: impl Into<Option<gst::ClockTime>>,
-    );
-
-    #[doc(alias = "get_output_state")]
-    fn output_state(&self) -> Option<VideoCodecState<'static, Readable>>;
-    fn set_output_state(
-        &self,
-        fmt: VideoFormat,
-        width: u32,
-        height: u32,
-        reference: Option<&VideoCodecState<Readable>>,
-    ) -> Result<VideoCodecState<InNegotiation>, gst::FlowError>;
-    #[cfg(feature = "v1_16")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_16")))]
-    fn set_interlaced_output_state(
-        &self,
-        fmt: VideoFormat,
-        mode: VideoInterlaceMode,
-        width: u32,
-        height: u32,
-        reference: Option<&VideoCodecState<Readable>>,
-    ) -> Result<VideoCodecState<InNegotiation>, gst::FlowError>;
-
-    fn negotiate<'a>(
-        &'a self,
-        output_state: VideoCodecState<'a, InNegotiation<'a>>,
-    ) -> Result<(), gst::FlowError>;
-
-    #[allow(clippy::too_many_arguments)]
-    fn error<T: gst::MessageErrorDomain>(
-        &self,
-        weight: i32,
-        code: T,
-        message: Option<&str>,
-        debug: Option<&str>,
-        file: &str,
-        function: &str,
-        line: u32,
-    ) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    fn sink_pad(&self) -> &gst::Pad;
-
-    fn src_pad(&self) -> &gst::Pad;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::VideoDecoder>> Sealed for T {}
 }
 
-impl<O: IsA<VideoDecoder>> VideoDecoderExtManual for O {
+pub trait VideoDecoderExtManual: sealed::Sealed + IsA<VideoDecoder> + 'static {
     #[doc(alias = "gst_video_decoder_allocate_output_frame")]
     fn allocate_output_frame(
         &self,
@@ -112,6 +49,55 @@ impl<O: IsA<VideoDecoder>> VideoDecoderExtManual for O {
         }
     }
 
+    #[doc(alias = "get_frame")]
+    #[doc(alias = "gst_video_decoder_get_frame")]
+    fn frame(&self, frame_number: i32) -> Option<VideoCodecFrame> {
+        let frame = unsafe {
+            ffi::gst_video_decoder_get_frame(self.as_ref().to_glib_none().0, frame_number)
+        };
+
+        if frame.is_null() {
+            None
+        } else {
+            unsafe { Some(VideoCodecFrame::new(frame, self.as_ref())) }
+        }
+    }
+
+    #[doc(alias = "get_frames")]
+    #[doc(alias = "gst_video_decoder_get_frames")]
+    fn frames(&self) -> Vec<VideoCodecFrame> {
+        unsafe {
+            let frames = ffi::gst_video_decoder_get_frames(self.as_ref().to_glib_none().0);
+            let mut iter: *const glib::ffi::GList = frames;
+            let mut vec = Vec::new();
+
+            while !iter.is_null() {
+                let frame_ptr = Ptr::from((*iter).data);
+                /* transfer ownership of the frame */
+                let frame = VideoCodecFrame::new(frame_ptr, self.as_ref());
+                vec.push(frame);
+                iter = (*iter).next;
+            }
+
+            glib::ffi::g_list_free(frames);
+            vec
+        }
+    }
+
+    #[doc(alias = "get_oldest_frame")]
+    #[doc(alias = "gst_video_decoder_get_oldest_frame")]
+    fn oldest_frame(&self) -> Option<VideoCodecFrame> {
+        let frame =
+            unsafe { ffi::gst_video_decoder_get_oldest_frame(self.as_ref().to_glib_none().0) };
+
+        if frame.is_null() {
+            None
+        } else {
+            unsafe { Some(VideoCodecFrame::new(frame, self.as_ref())) }
+        }
+    }
+
+    #[doc(alias = "get_allocator")]
     #[doc(alias = "gst_video_decoder_get_allocator")]
     fn allocator(&self) -> (Option<gst::Allocator>, gst::AllocationParams) {
         unsafe {
@@ -125,7 +111,7 @@ impl<O: IsA<VideoDecoder>> VideoDecoderExtManual for O {
             (from_glib_full(allocator), params.assume_init().into())
         }
     }
-
+    #[doc(alias = "get_latency")]
     #[doc(alias = "gst_video_decoder_get_latency")]
     fn latency(&self) -> (gst::ClockTime, Option<gst::ClockTime>) {
         let mut min_latency = gst::ffi::GST_CLOCK_TIME_NONE;
@@ -160,51 +146,7 @@ impl<O: IsA<VideoDecoder>> VideoDecoderExtManual for O {
         }
     }
 
-    #[doc(alias = "gst_video_decoder_get_frame")]
-    fn frame(&self, frame_number: i32) -> Option<VideoCodecFrame> {
-        let frame = unsafe {
-            ffi::gst_video_decoder_get_frame(self.as_ref().to_glib_none().0, frame_number)
-        };
-
-        if frame.is_null() {
-            None
-        } else {
-            unsafe { Some(VideoCodecFrame::new(frame, self.as_ref())) }
-        }
-    }
-
-    #[doc(alias = "gst_video_decoder_get_frames")]
-    fn frames(&self) -> Vec<VideoCodecFrame> {
-        unsafe {
-            let frames = ffi::gst_video_decoder_get_frames(self.as_ref().to_glib_none().0);
-            let mut iter: *const glib::ffi::GList = frames;
-            let mut vec = Vec::new();
-
-            while !iter.is_null() {
-                let frame_ptr = Ptr::from((*iter).data);
-                /* transfer ownership of the frame */
-                let frame = VideoCodecFrame::new(frame_ptr, self.as_ref());
-                vec.push(frame);
-                iter = (*iter).next;
-            }
-
-            glib::ffi::g_list_free(frames);
-            vec
-        }
-    }
-
-    #[doc(alias = "gst_video_decoder_get_oldest_frame")]
-    fn oldest_frame(&self) -> Option<VideoCodecFrame> {
-        let frame =
-            unsafe { ffi::gst_video_decoder_get_oldest_frame(self.as_ref().to_glib_none().0) };
-
-        if frame.is_null() {
-            None
-        } else {
-            unsafe { Some(VideoCodecFrame::new(frame, self.as_ref())) }
-        }
-    }
-
+    #[doc(alias = "get_output_state")]
     #[doc(alias = "gst_video_decoder_get_output_state")]
     fn output_state(&self) -> Option<VideoCodecState<'static, Readable>> {
         let state =
@@ -299,6 +241,8 @@ impl<O: IsA<VideoDecoder>> VideoDecoderExtManual for O {
             Err(gst::FlowError::NotNegotiated)
         }
     }
+
+    #[allow(clippy::too_many_arguments)]
     fn error<T: gst::MessageErrorDomain>(
         &self,
         weight: i32,
@@ -339,6 +283,8 @@ impl<O: IsA<VideoDecoder>> VideoDecoderExtManual for O {
     }
 }
 
+impl<O: IsA<VideoDecoder>> VideoDecoderExtManual for O {}
+
 impl HasStreamLock for VideoDecoder {
     fn stream_lock(&self) -> *mut glib::ffi::GRecMutex {
         let decoder_sys: *const ffi::GstVideoDecoder = self.to_glib_none().0;

gstreamer-video/src/video_encoder.rs

@@ -9,69 +9,13 @@ use crate::{
     video_codec_state::{InNegotiation, Readable, VideoCodecState, VideoCodecStateContext},
     VideoCodecFrame, VideoEncoder,
 };
-
-pub trait VideoEncoderExtManual: 'static {
-    #[doc(alias = "gst_video_encoder_allocate_output_frame")]
-    fn allocate_output_frame(
-        &self,
-        frame: &mut VideoCodecFrame,
-        size: usize,
-    ) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    #[doc(alias = "get_frame")]
-    #[doc(alias = "gst_video_encoder_get_frame")]
-    fn frame(&self, frame_number: i32) -> Option<VideoCodecFrame>;
-    #[doc(alias = "get_frames")]
-    #[doc(alias = "gst_video_encoder_get_frames")]
-    fn frames(&self) -> Vec<VideoCodecFrame>;
-    #[doc(alias = "get_oldest_frame")]
-    #[doc(alias = "gst_video_encoder_get_oldest_frame")]
-    fn oldest_frame(&self) -> Option<VideoCodecFrame>;
-
-    #[doc(alias = "get_allocator")]
-    #[doc(alias = "gst_video_encoder_get_allocator")]
-    fn allocator(&self) -> (Option<gst::Allocator>, gst::AllocationParams);
-
-    #[cfg(feature = "v1_18")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
-    #[doc(alias = "gst_video_encoder_finish_subframe")]
-    fn finish_subframe(&self, frame: &VideoCodecFrame) -> Result<gst::FlowSuccess, gst::FlowError>;
-
-    #[doc(alias = "get_latency")]
-    #[doc(alias = "gst_video_encoder_get_latency")]
-    fn latency(&self) -> (gst::ClockTime, Option<gst::ClockTime>);
-    #[doc(alias = "gst_video_encoder_set_latency")]
-    fn set_latency(
-        &self,
-        min_latency: gst::ClockTime,
-        max_latency: impl Into<Option<gst::ClockTime>>,
-    );
-
-    #[doc(alias = "get_output_state")]
-    #[doc(alias = "gst_video_encoder_get_output_state")]
-    fn output_state(&self) -> Option<VideoCodecState<'static, Readable>>;
-    #[doc(alias = "gst_video_encoder_set_output_state")]
-    fn set_output_state(
-        &self,
-        caps: gst::Caps,
-        reference: Option<&VideoCodecState<Readable>>,
-    ) -> Result<VideoCodecState<InNegotiation>, gst::FlowError>;
-
-    #[doc(alias = "gst_video_encoder_negotiate")]
-    fn negotiate<'a>(
-        &'a self,
-        output_state: VideoCodecState<'a, InNegotiation<'a>>,
-    ) -> Result<(), gst::FlowError>;
-
-    #[doc(alias = "gst_video_encoder_set_headers")]
-    fn set_headers(&self, headers: impl IntoIterator<Item = gst::Buffer>);
-
-    fn sink_pad(&self) -> &gst::Pad;
-
-    fn src_pad(&self) -> &gst::Pad;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::VideoEncoder>> Sealed for T {}
 }
 
-impl<O: IsA<VideoEncoder>> VideoEncoderExtManual for O {
+pub trait VideoEncoderExtManual: sealed::Sealed + IsA<VideoEncoder> + 'static {
+    #[doc(alias = "gst_video_encoder_allocate_output_frame")]
     fn allocate_output_frame(
         &self,
         frame: &mut VideoCodecFrame,
@@ -86,62 +30,8 @@ impl<O: IsA<VideoEncoder>> VideoEncoderExtManual for O {
         }
     }
 
-    fn allocator(&self) -> (Option<gst::Allocator>, gst::AllocationParams) {
-        unsafe {
-            let mut allocator = ptr::null_mut();
-            let mut params = mem::MaybeUninit::uninit();
-            ffi::gst_video_encoder_get_allocator(
-                self.as_ref().to_glib_none().0,
-                &mut allocator,
-                params.as_mut_ptr(),
-            );
-            (from_glib_full(allocator), params.assume_init().into())
-        }
-    }
-
-    #[cfg(feature = "v1_18")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
-    fn finish_subframe(&self, frame: &VideoCodecFrame) -> Result<gst::FlowSuccess, gst::FlowError> {
-        unsafe {
-            try_from_glib(ffi::gst_video_encoder_finish_subframe(
-                self.as_ref().to_glib_none().0,
-                frame.to_glib_none().0,
-            ))
-        }
-    }
-
-    fn latency(&self) -> (gst::ClockTime, Option<gst::ClockTime>) {
-        let mut min_latency = gst::ffi::GST_CLOCK_TIME_NONE;
-        let mut max_latency = gst::ffi::GST_CLOCK_TIME_NONE;
-
-        unsafe {
-            ffi::gst_video_encoder_get_latency(
-                self.as_ref().to_glib_none().0,
-                &mut min_latency,
-                &mut max_latency,
-            );
-
-            (
-                try_from_glib(min_latency).expect("undefined min_latency"),
-                from_glib(max_latency),
-            )
-        }
-    }
-
-    fn set_latency(
-        &self,
-        min_latency: gst::ClockTime,
-        max_latency: impl Into<Option<gst::ClockTime>>,
-    ) {
-        unsafe {
-            ffi::gst_video_encoder_set_latency(
-                self.as_ref().to_glib_none().0,
-                min_latency.into_glib(),
-                max_latency.into().into_glib(),
-            );
-        }
-    }
-
+    #[doc(alias = "get_frame")]
+    #[doc(alias = "gst_video_encoder_get_frame")]
     fn frame(&self, frame_number: i32) -> Option<VideoCodecFrame> {
         let frame = unsafe {
             ffi::gst_video_encoder_get_frame(self.as_ref().to_glib_none().0, frame_number)
@@ -154,6 +44,8 @@ impl<O: IsA<VideoEncoder>> VideoEncoderExtManual for O {
         }
     }
 
+    #[doc(alias = "get_frames")]
+    #[doc(alias = "gst_video_encoder_get_frames")]
     fn frames(&self) -> Vec<VideoCodecFrame> {
         unsafe {
             let frames = ffi::gst_video_encoder_get_frames(self.as_ref().to_glib_none().0);
@@ -173,6 +65,8 @@ impl<O: IsA<VideoEncoder>> VideoEncoderExtManual for O {
         }
     }
 
+    #[doc(alias = "get_oldest_frame")]
+    #[doc(alias = "gst_video_encoder_get_oldest_frame")]
     fn oldest_frame(&self) -> Option<VideoCodecFrame> {
         let frame =
             unsafe { ffi::gst_video_encoder_get_oldest_frame(self.as_ref().to_glib_none().0) };
@@ -184,6 +78,69 @@ impl<O: IsA<VideoEncoder>> VideoEncoderExtManual for O {
         }
     }
 
+    #[doc(alias = "get_allocator")]
+    #[doc(alias = "gst_video_encoder_get_allocator")]
+    fn allocator(&self) -> (Option<gst::Allocator>, gst::AllocationParams) {
+        unsafe {
+            let mut allocator = ptr::null_mut();
+            let mut params = mem::MaybeUninit::uninit();
+            ffi::gst_video_encoder_get_allocator(
+                self.as_ref().to_glib_none().0,
+                &mut allocator,
+                params.as_mut_ptr(),
+            );
+            (from_glib_full(allocator), params.assume_init().into())
+        }
+    }
+
+    #[cfg(feature = "v1_18")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
+    #[doc(alias = "gst_video_encoder_finish_subframe")]
+    fn finish_subframe(&self, frame: &VideoCodecFrame) -> Result<gst::FlowSuccess, gst::FlowError> {
+        unsafe {
+            try_from_glib(ffi::gst_video_encoder_finish_subframe(
+                self.as_ref().to_glib_none().0,
+                frame.to_glib_none().0,
+            ))
+        }
+    }
+
+    #[doc(alias = "get_latency")]
+    #[doc(alias = "gst_video_encoder_get_latency")]
+    fn latency(&self) -> (gst::ClockTime, Option<gst::ClockTime>) {
+        let mut min_latency = gst::ffi::GST_CLOCK_TIME_NONE;
+        let mut max_latency = gst::ffi::GST_CLOCK_TIME_NONE;
+
+        unsafe {
+            ffi::gst_video_encoder_get_latency(
+                self.as_ref().to_glib_none().0,
+                &mut min_latency,
+                &mut max_latency,
+            );
+
+            (
+                try_from_glib(min_latency).expect("undefined min_latency"),
+                from_glib(max_latency),
+            )
+        }
+    }
+
+    #[doc(alias = "gst_video_encoder_set_latency")]
+    fn set_latency(
+        &self,
+        min_latency: gst::ClockTime,
+        max_latency: impl Into<Option<gst::ClockTime>>,
+    ) {
+        unsafe {
+            ffi::gst_video_encoder_set_latency(
+                self.as_ref().to_glib_none().0,
+                min_latency.into_glib(),
+                max_latency.into().into_glib(),
+            );
+        }
+    }
+    #[doc(alias = "get_output_state")]
+    #[doc(alias = "gst_video_encoder_get_output_state")]
     fn output_state(&self) -> Option<VideoCodecState<'static, Readable>> {
         let state =
             unsafe { ffi::gst_video_encoder_get_output_state(self.as_ref().to_glib_none().0) };
@@ -195,6 +152,7 @@ impl<O: IsA<VideoEncoder>> VideoEncoderExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_video_encoder_set_output_state")]
     fn set_output_state(
         &self,
         caps: gst::Caps,
@@ -219,6 +177,7 @@ impl<O: IsA<VideoEncoder>> VideoEncoderExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_video_encoder_negotiate")]
     fn negotiate<'a>(
         &'a self,
         output_state: VideoCodecState<'a, InNegotiation<'a>>,
@@ -239,6 +198,7 @@ impl<O: IsA<VideoEncoder>> VideoEncoderExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_video_encoder_set_headers")]
     fn set_headers(&self, headers: impl IntoIterator<Item = gst::Buffer>) {
         unsafe {
             ffi::gst_video_encoder_set_headers(
@@ -266,6 +226,8 @@ impl<O: IsA<VideoEncoder>> VideoEncoderExtManual for O {
     }
 }
 
+impl<O: IsA<VideoEncoder>> VideoEncoderExtManual for O {}
+
 impl HasStreamLock for VideoEncoder {
     fn stream_lock(&self) -> *mut glib::ffi::GRecMutex {
         let encoder_sys: *const ffi::GstVideoEncoder = self.to_glib_none().0;

gstreamer-video/src/video_overlay.rs

@@ -5,12 +5,12 @@ use libc::uintptr_t;
 
 use crate::VideoOverlay;
 
-pub trait VideoOverlayExtManual: 'static {
-    unsafe fn set_window_handle(&self, handle: uintptr_t);
-    unsafe fn got_window_handle(&self, handle: uintptr_t);
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::VideoOverlay>> Sealed for T {}
 }
 
-impl<O: IsA<VideoOverlay>> VideoOverlayExtManual for O {
+pub trait VideoOverlayExtManual: sealed::Sealed + IsA<VideoOverlay> + 'static {
     unsafe fn set_window_handle(&self, handle: uintptr_t) {
         ffi::gst_video_overlay_set_window_handle(self.as_ref().to_glib_none().0, handle)
     }
@@ -20,6 +20,8 @@ impl<O: IsA<VideoOverlay>> VideoOverlayExtManual for O {
     }
 }
 
+impl<O: IsA<VideoOverlay>> VideoOverlayExtManual for O {}
+
 #[doc(alias = "gst_is_video_overlay_prepare_window_handle_message")]
 pub fn is_video_overlay_prepare_window_handle_message(msg: &gst::MessageRef) -> bool {
     skip_assert_initialized!();

gstreamer-webrtc/src/web_rtcice.rs

@@ -4,22 +4,13 @@ use glib::{prelude::*, translate::*};
 
 use crate::{WebRTCICE, WebRTCICEStream};
 
-pub trait WebRTCICEExtManual: 'static {
-    #[doc(alias = "gst_webrtc_ice_add_candidate")]
-    fn add_candidate(&self, stream: &impl IsA<WebRTCICEStream>, candidate: &str);
-
-    #[cfg(feature = "v1_24")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_24")))]
-    #[doc(alias = "gst_webrtc_ice_add_candidate")]
-    fn add_candidate_full(
-        &self,
-        stream: &impl IsA<WebRTCICEStream>,
-        candidate: &str,
-        promise: Option<&gst::Promise>,
-    );
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::WebRTCICE>> Sealed for T {}
 }
 
-impl<O: IsA<WebRTCICE>> WebRTCICEExtManual for O {
+pub trait WebRTCICEExtManual: sealed::Sealed + IsA<WebRTCICE> + 'static {
+    #[doc(alias = "gst_webrtc_ice_add_candidate")]
     fn add_candidate(&self, stream: &impl IsA<WebRTCICEStream>, candidate: &str) {
         #[cfg(not(feature = "v1_24"))]
         unsafe {
@@ -61,6 +52,7 @@ impl<O: IsA<WebRTCICE>> WebRTCICEExtManual for O {
 
     #[cfg(feature = "v1_24")]
     #[cfg_attr(docsrs, doc(cfg(feature = "v1_24")))]
+    #[doc(alias = "gst_webrtc_ice_add_candidate")]
     fn add_candidate_full(
         &self,
         stream: &impl IsA<WebRTCICEStream>,
@@ -77,3 +69,5 @@ impl<O: IsA<WebRTCICE>> WebRTCICEExtManual for O {
         }
     }
 }
+
+impl<O: IsA<WebRTCICE>> WebRTCICEExtManual for O {}

gstreamer/src/bin.rs

@@ -42,70 +42,13 @@ impl Bin {
     }
 }
 
-pub trait GstBinExtManual: 'static {
-    #[doc(alias = "gst_bin_add_many")]
-    fn add_many(
-        &self,
-        elements: impl IntoIterator<Item = impl AsRef<Element>>,
-    ) -> Result<(), glib::BoolError>;
-
-    #[doc(alias = "gst_bin_remove_many")]
-    fn remove_many(
-        &self,
-        elements: impl IntoIterator<Item = impl AsRef<Element>>,
-    ) -> Result<(), glib::BoolError>;
-
-    #[doc(alias = "do-latency")]
-    fn connect_do_latency<F: Fn(&Self) -> Result<(), LoggableError> + Send + Sync + 'static>(
-        &self,
-        f: F,
-    ) -> SignalHandlerId;
-
-    #[cfg(feature = "v1_18")]
-    #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
-    #[doc(alias = "gst_bin_iterate_all_by_element_factory_name")]
-    fn iterate_all_by_element_factory_name(&self, factory_name: &str) -> crate::Iterator<Element>;
-    #[doc(alias = "gst_bin_iterate_all_by_interface")]
-    fn iterate_all_by_interface(&self, iface: glib::types::Type) -> crate::Iterator<Element>;
-    #[doc(alias = "gst_bin_iterate_elements")]
-    fn iterate_elements(&self) -> crate::Iterator<Element>;
-    #[doc(alias = "gst_bin_iterate_recurse")]
-    fn iterate_recurse(&self) -> crate::Iterator<Element>;
-    #[doc(alias = "gst_bin_iterate_sinks")]
-    fn iterate_sinks(&self) -> crate::Iterator<Element>;
-    #[doc(alias = "gst_bin_iterate_sorted")]
-    fn iterate_sorted(&self) -> crate::Iterator<Element>;
-    #[doc(alias = "gst_bin_iterate_sources")]
-    fn iterate_sources(&self) -> crate::Iterator<Element>;
-    #[doc(alias = "get_children")]
-    fn children(&self) -> Vec<Element>;
-
-    #[doc(alias = "gst_debug_bin_to_dot_data")]
-    fn debug_to_dot_data(&self, details: crate::DebugGraphDetails) -> GString;
-    #[doc(alias = "GST_DEBUG_BIN_TO_DOT_FILE")]
-    #[doc(alias = "gst_debug_bin_to_dot_file")]
-    fn debug_to_dot_file(
-        &self,
-        details: crate::DebugGraphDetails,
-        file_name: impl AsRef<path::Path>,
-    );
-    #[doc(alias = "GST_DEBUG_BIN_TO_DOT_FILE_WITH_TS")]
-    #[doc(alias = "gst_debug_bin_to_dot_file_with_ts")]
-    fn debug_to_dot_file_with_ts(
-        &self,
-        details: crate::DebugGraphDetails,
-        file_name: impl AsRef<path::Path>,
-    );
-
-    fn set_bin_flags(&self, flags: BinFlags);
-
-    fn unset_bin_flags(&self, flags: BinFlags);
-
-    #[doc(alias = "get_bin_flags")]
-    fn bin_flags(&self) -> BinFlags;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::Bin>> Sealed for T {}
 }
 
-impl<O: IsA<Bin>> GstBinExtManual for O {
+pub trait GstBinExtManual: sealed::Sealed + IsA<Bin> + 'static {
+    #[doc(alias = "gst_bin_add_many")]
     fn add_many(
         &self,
         elements: impl IntoIterator<Item = impl AsRef<Element>>,
@@ -122,6 +65,7 @@ impl<O: IsA<Bin>> GstBinExtManual for O {
         Ok(())
     }
 
+    #[doc(alias = "gst_bin_remove_many")]
     fn remove_many(
         &self,
         elements: impl IntoIterator<Item = impl AsRef<Element>>,
@@ -141,6 +85,7 @@ impl<O: IsA<Bin>> GstBinExtManual for O {
         Ok(())
     }
 
+    #[doc(alias = "do-latency")]
     fn connect_do_latency<F: Fn(&Self) -> Result<(), LoggableError> + Send + Sync + 'static>(
         &self,
         f: F,
@@ -160,6 +105,7 @@ impl<O: IsA<Bin>> GstBinExtManual for O {
 
     #[cfg(feature = "v1_18")]
     #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
+    #[doc(alias = "gst_bin_iterate_all_by_element_factory_name")]
     fn iterate_all_by_element_factory_name(&self, factory_name: &str) -> crate::Iterator<Element> {
         unsafe {
             from_glib_full(ffi::gst_bin_iterate_all_by_element_factory_name(
@@ -168,7 +114,7 @@ impl<O: IsA<Bin>> GstBinExtManual for O {
             ))
         }
     }
-
+    #[doc(alias = "gst_bin_iterate_all_by_interface")]
     fn iterate_all_by_interface(&self, iface: glib::types::Type) -> crate::Iterator<Element> {
         unsafe {
             from_glib_full(ffi::gst_bin_iterate_all_by_interface(
@@ -178,6 +124,7 @@ impl<O: IsA<Bin>> GstBinExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_bin_iterate_elements")]
     fn iterate_elements(&self) -> crate::Iterator<Element> {
         unsafe {
             from_glib_full(ffi::gst_bin_iterate_elements(
@@ -186,22 +133,27 @@ impl<O: IsA<Bin>> GstBinExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_bin_iterate_recurse")]
     fn iterate_recurse(&self) -> crate::Iterator<Element> {
         unsafe { from_glib_full(ffi::gst_bin_iterate_recurse(self.as_ref().to_glib_none().0)) }
     }
 
+    #[doc(alias = "gst_bin_iterate_sinks")]
     fn iterate_sinks(&self) -> crate::Iterator<Element> {
         unsafe { from_glib_full(ffi::gst_bin_iterate_sinks(self.as_ref().to_glib_none().0)) }
     }
 
+    #[doc(alias = "gst_bin_iterate_sorted")]
     fn iterate_sorted(&self) -> crate::Iterator<Element> {
         unsafe { from_glib_full(ffi::gst_bin_iterate_sorted(self.as_ref().to_glib_none().0)) }
     }
 
+    #[doc(alias = "gst_bin_iterate_sources")]
     fn iterate_sources(&self) -> crate::Iterator<Element> {
         unsafe { from_glib_full(ffi::gst_bin_iterate_sources(self.as_ref().to_glib_none().0)) }
     }
 
+    #[doc(alias = "get_children")]
     fn children(&self) -> Vec<Element> {
         unsafe {
             let bin: &ffi::GstBin = &*(self.as_ptr() as *const _);
@@ -210,10 +162,13 @@ impl<O: IsA<Bin>> GstBinExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_debug_bin_to_dot_data")]
     fn debug_to_dot_data(&self, details: crate::DebugGraphDetails) -> GString {
         crate::debug_bin_to_dot_data(self, details)
     }
 
+    #[doc(alias = "GST_DEBUG_BIN_TO_DOT_FILE")]
+    #[doc(alias = "gst_debug_bin_to_dot_file")]
     fn debug_to_dot_file(
         &self,
         details: crate::DebugGraphDetails,
@@ -222,6 +177,8 @@ impl<O: IsA<Bin>> GstBinExtManual for O {
         crate::debug_bin_to_dot_file(self, details, file_name)
     }
 
+    #[doc(alias = "GST_DEBUG_BIN_TO_DOT_FILE_WITH_TS")]
+    #[doc(alias = "gst_debug_bin_to_dot_file_with_ts")]
     fn debug_to_dot_file_with_ts(
         &self,
         details: crate::DebugGraphDetails,
@@ -246,6 +203,7 @@ impl<O: IsA<Bin>> GstBinExtManual for O {
         }
     }
 
+    #[doc(alias = "get_bin_flags")]
     fn bin_flags(&self) -> BinFlags {
         unsafe {
             let ptr: *mut ffi::GstObject = self.as_ptr() as *mut _;
@@ -255,6 +213,8 @@ impl<O: IsA<Bin>> GstBinExtManual for O {
     }
 }
 
+impl<O: IsA<Bin>> GstBinExtManual for O {}
+
 impl Default for Bin {
     fn default() -> Self {
         glib::object::Object::new()

gstreamer/src/buffer_pool.rs

@@ -345,23 +345,14 @@ impl FromGlibPtrNone<*mut ffi::GstBufferPoolAcquireParams> for BufferPoolAcquire
     }
 }
 
-pub trait BufferPoolExtManual: 'static {
-    #[doc(alias = "get_config")]
-    #[doc(alias = "gst_buffer_pool_get_config")]
-    fn config(&self) -> BufferPoolConfig;
-    #[doc(alias = "gst_buffer_pool_set_config")]
-    fn set_config(&self, config: BufferPoolConfig) -> Result<(), glib::error::BoolError>;
-
-    fn is_flushing(&self) -> bool;
-
-    #[doc(alias = "gst_buffer_pool_acquire_buffer")]
-    fn acquire_buffer(
-        &self,
-        params: Option<&BufferPoolAcquireParams>,
-    ) -> Result<crate::Buffer, crate::FlowError>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::BufferPool>> Sealed for T {}
 }
 
-impl<O: IsA<BufferPool>> BufferPoolExtManual for O {
+pub trait BufferPoolExtManual: sealed::Sealed + IsA<BufferPool> + 'static {
+    #[doc(alias = "get_config")]
+    #[doc(alias = "gst_buffer_pool_get_config")]
     fn config(&self) -> BufferPoolConfig {
         unsafe {
             let ptr = ffi::gst_buffer_pool_get_config(self.as_ref().to_glib_none().0);
@@ -369,6 +360,7 @@ impl<O: IsA<BufferPool>> BufferPoolExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_buffer_pool_set_config")]
     fn set_config(&self, config: BufferPoolConfig) -> Result<(), glib::error::BoolError> {
         unsafe {
             glib::result_from_gboolean!(
@@ -390,6 +382,7 @@ impl<O: IsA<BufferPool>> BufferPoolExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_buffer_pool_acquire_buffer")]
     fn acquire_buffer(
         &self,
         params: Option<&BufferPoolAcquireParams>,
@@ -408,6 +401,8 @@ impl<O: IsA<BufferPool>> BufferPoolExtManual for O {
     }
 }
 
+impl<O: IsA<BufferPool>> BufferPoolExtManual for O {}
+
 #[cfg(test)]
 mod tests {
     use super::*;

gstreamer/src/child_proxy.rs

@@ -6,24 +6,13 @@ use glib::{prelude::*, translate::*};
 
 use crate::ChildProxy;
 
-pub trait ChildProxyExtManual: 'static {
-    #[doc(alias = "gst_child_proxy_lookup")]
-    fn lookup(&self, name: &str) -> Result<(glib::Object, glib::ParamSpec), glib::BoolError>;
-
-    #[doc(alias = "get_child_property")]
-    #[doc(alias = "gst_child_proxy_get")]
-    fn child_property<V: for<'b> glib::value::FromValue<'b> + 'static>(&self, name: &str) -> V;
-    #[doc(alias = "get_child_property")]
-    #[doc(alias = "gst_child_proxy_get")]
-    fn child_property_value(&self, name: &str) -> glib::Value;
-
-    #[doc(alias = "gst_child_proxy_set")]
-    fn set_child_property(&self, name: &str, value: impl Into<glib::Value>);
-    #[doc(alias = "gst_child_proxy_set_property")]
-    fn set_child_property_from_value(&self, name: &str, value: &glib::Value);
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::ChildProxy>> Sealed for T {}
 }
 
-impl<O: IsA<ChildProxy>> ChildProxyExtManual for O {
+pub trait ChildProxyExtManual: sealed::Sealed + IsA<ChildProxy> + 'static {
+    #[doc(alias = "gst_child_proxy_lookup")]
     fn lookup(&self, name: &str) -> Result<(glib::Object, glib::ParamSpec), glib::BoolError> {
         unsafe {
             let mut target = ptr::null_mut();
@@ -42,27 +31,35 @@ impl<O: IsA<ChildProxy>> ChildProxyExtManual for O {
         }
     }
 
+    #[doc(alias = "get_child_property")]
+    #[doc(alias = "gst_child_proxy_get")]
     #[track_caller]
     fn child_property<V: for<'b> glib::value::FromValue<'b> + 'static>(&self, name: &str) -> V {
         let (child, pspec) = self.lookup(name).unwrap();
         child.property(pspec.name())
     }
 
+    #[doc(alias = "get_child_property")]
+    #[doc(alias = "gst_child_proxy_get")]
     #[track_caller]
     fn child_property_value(&self, name: &str) -> glib::Value {
         let (child, pspec) = self.lookup(name).unwrap();
         child.property_value(pspec.name())
     }
 
+    #[doc(alias = "gst_child_proxy_set")]
     #[track_caller]
     fn set_child_property(&self, name: &str, value: impl Into<glib::Value>) {
         let (child, pspec) = self.lookup(name).unwrap();
         child.set_property(pspec.name(), value)
     }
 
+    #[doc(alias = "gst_child_proxy_set_property")]
     #[track_caller]
     fn set_child_property_from_value(&self, name: &str, value: &glib::Value) {
         let (child, pspec) = self.lookup(name).unwrap();
         child.set_property_from_value(pspec.name(), value)
     }
 }
+
+impl<O: IsA<ChildProxy>> ChildProxyExtManual for O {}

gstreamer/src/clock.rs

@@ -420,37 +420,13 @@ impl Clock {
     }
 }
 
-pub trait ClockExtManual: 'static {
-    #[doc(alias = "gst_clock_new_periodic_id")]
-    fn new_periodic_id(&self, start_time: ClockTime, interval: ClockTime) -> PeriodicClockId;
-
-    #[doc(alias = "gst_clock_periodic_id_reinit")]
-    fn periodic_id_reinit(
-        &self,
-        id: &PeriodicClockId,
-        start_time: ClockTime,
-        interval: ClockTime,
-    ) -> Result<(), glib::BoolError>;
-
-    #[doc(alias = "gst_clock_new_single_shot_id")]
-    fn new_single_shot_id(&self, time: ClockTime) -> SingleShotClockId;
-
-    #[doc(alias = "gst_clock_single_shot_id_reinit")]
-    fn single_shot_id_reinit(
-        &self,
-        id: &SingleShotClockId,
-        time: ClockTime,
-    ) -> Result<(), glib::BoolError>;
-
-    fn set_clock_flags(&self, flags: ClockFlags);
-
-    fn unset_clock_flags(&self, flags: ClockFlags);
-
-    #[doc(alias = "get_clock_flags")]
-    fn clock_flags(&self) -> ClockFlags;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::Clock>> Sealed for T {}
 }
 
-impl<O: IsA<Clock>> ClockExtManual for O {
+pub trait ClockExtManual: sealed::Sealed + IsA<Clock> + 'static {
+    #[doc(alias = "gst_clock_new_periodic_id")]
     fn new_periodic_id(&self, start_time: ClockTime, interval: ClockTime) -> PeriodicClockId {
         assert_ne!(interval, ClockTime::ZERO);
 
@@ -463,6 +439,7 @@ impl<O: IsA<Clock>> ClockExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_clock_periodic_id_reinit")]
     fn periodic_id_reinit(
         &self,
         id: &PeriodicClockId,
@@ -484,6 +461,7 @@ impl<O: IsA<Clock>> ClockExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_clock_new_single_shot_id")]
     fn new_single_shot_id(&self, time: ClockTime) -> SingleShotClockId {
         unsafe {
             SingleShotClockId(from_glib_full(ffi::gst_clock_new_single_shot_id(
@@ -493,6 +471,7 @@ impl<O: IsA<Clock>> ClockExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_clock_single_shot_id_reinit")]
     fn single_shot_id_reinit(
         &self,
         id: &SingleShotClockId,
@@ -528,6 +507,7 @@ impl<O: IsA<Clock>> ClockExtManual for O {
         }
     }
 
+    #[doc(alias = "get_clock_flags")]
     fn clock_flags(&self) -> ClockFlags {
         unsafe {
             let ptr: *mut ffi::GstObject = self.as_ptr() as *mut _;
@@ -537,6 +517,8 @@ impl<O: IsA<Clock>> ClockExtManual for O {
     }
 }
 
+impl<O: IsA<Clock>> ClockExtManual for O {}
+
 #[cfg(test)]
 mod tests {
     use std::sync::mpsc::channel;

gstreamer/src/control_binding.rs

@@ -4,18 +4,14 @@ use glib::{prelude::*, translate::*};
 
 use crate::{ClockTime, ControlBinding};
 
-pub trait ControlBindingExtManual: 'static {
-    #[doc(alias = "get_g_value_array")]
-    #[doc(alias = "gst_control_binding_get_g_value_array")]
-    fn g_value_array(
-        &self,
-        timestamp: ClockTime,
-        interval: ClockTime,
-        values: &mut [glib::Value],
-    ) -> Result<(), glib::error::BoolError>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::ControlBinding>> Sealed for T {}
 }
 
-impl<O: IsA<ControlBinding>> ControlBindingExtManual for O {
+pub trait ControlBindingExtManual: sealed::Sealed + IsA<ControlBinding> + 'static {
+    #[doc(alias = "get_g_value_array")]
+    #[doc(alias = "gst_control_binding_get_g_value_array")]
     fn g_value_array(
         &self,
         timestamp: ClockTime,
@@ -37,3 +33,5 @@ impl<O: IsA<ControlBinding>> ControlBindingExtManual for O {
         }
     }
 }
+
+impl<O: IsA<ControlBinding>> ControlBindingExtManual for O {}

gstreamer/src/control_source.rs

@@ -4,18 +4,14 @@ use glib::{prelude::*, translate::*};
 
 use crate::{ClockTime, ControlSource};
 
-pub trait ControlSourceExtManual: 'static {
-    #[doc(alias = "get_value_array")]
-    #[doc(alias = "gst_control_source_get_value_array")]
-    fn value_array(
-        &self,
-        timestamp: ClockTime,
-        interval: ClockTime,
-        values: &mut [f64],
-    ) -> Result<(), glib::error::BoolError>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::ControlSource>> Sealed for T {}
 }
 
-impl<O: IsA<ControlSource>> ControlSourceExtManual for O {
+pub trait ControlSourceExtManual: sealed::Sealed + IsA<ControlSource> + 'static {
+    #[doc(alias = "get_value_array")]
+    #[doc(alias = "gst_control_source_get_value_array")]
     fn value_array(
         &self,
         timestamp: ClockTime,
@@ -37,3 +33,5 @@ impl<O: IsA<ControlSource>> ControlSourceExtManual for O {
         }
     }
 }
+
+impl<O: IsA<ControlSource>> ControlSourceExtManual for O {}

gstreamer/src/device_monitor.rs

@@ -26,25 +26,13 @@ impl FromGlib<libc::c_uint> for DeviceMonitorFilterId {
         DeviceMonitorFilterId(NonZeroU32::new_unchecked(val))
     }
 }
-
-pub trait DeviceMonitorExtManual: 'static {
-    #[doc(alias = "gst_device_monitor_add_filter")]
-    fn add_filter(
-        &self,
-        classes: Option<&str>,
-        caps: Option<&Caps>,
-    ) -> Option<DeviceMonitorFilterId>;
-
-    #[doc(alias = "gst_device_monitor_remove_filter")]
-    fn remove_filter(&self, filter_id: DeviceMonitorFilterId)
-        -> Result<(), glib::error::BoolError>;
-
-    #[doc(alias = "gst_device_monitor_get_devices")]
-    #[doc(alias = "get_devices")]
-    fn devices(&self) -> glib::List<crate::Device>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::DeviceMonitor>> Sealed for T {}
 }
 
-impl<O: IsA<DeviceMonitor>> DeviceMonitorExtManual for O {
+pub trait DeviceMonitorExtManual: sealed::Sealed + IsA<DeviceMonitor> + 'static {
+    #[doc(alias = "gst_device_monitor_add_filter")]
     fn add_filter(
         &self,
         classes: Option<&str>,
@@ -65,6 +53,7 @@ impl<O: IsA<DeviceMonitor>> DeviceMonitorExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_device_monitor_remove_filter")]
     fn remove_filter(
         &self,
         filter_id: DeviceMonitorFilterId,
@@ -80,6 +69,8 @@ impl<O: IsA<DeviceMonitor>> DeviceMonitorExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_device_monitor_get_devices")]
+    #[doc(alias = "get_devices")]
     fn devices(&self) -> glib::List<crate::Device> {
         unsafe {
             FromGlibPtrContainer::from_glib_full(ffi::gst_device_monitor_get_devices(
@@ -88,3 +79,5 @@ impl<O: IsA<DeviceMonitor>> DeviceMonitorExtManual for O {
         }
     }
 }
+
+impl<O: IsA<DeviceMonitor>> DeviceMonitorExtManual for O {}

gstreamer/src/device_provider.rs

@@ -29,17 +29,14 @@ impl DeviceProvider {
     }
 }
 
-pub trait DeviceProviderExtManual: 'static {
-    #[doc(alias = "get_metadata")]
-    #[doc(alias = "gst_device_provider_class_get_metadata")]
-    fn metadata<'a>(&self, key: &str) -> Option<&'a str>;
-
-    #[doc(alias = "gst_device_provider_get_devices")]
-    #[doc(alias = "get_devices")]
-    fn devices(&self) -> glib::List<crate::Device>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::DeviceProvider>> Sealed for T {}
 }
 
-impl<O: IsA<DeviceProvider>> DeviceProviderExtManual for O {
+pub trait DeviceProviderExtManual: sealed::Sealed + IsA<DeviceProvider> + 'static {
+    #[doc(alias = "get_metadata")]
+    #[doc(alias = "gst_device_provider_class_get_metadata")]
     fn metadata<'a>(&self, key: &str) -> Option<&'a str> {
         unsafe {
             let klass = (*(self.as_ptr() as *mut glib::gobject_ffi::GTypeInstance)).g_class
@@ -55,6 +52,8 @@ impl<O: IsA<DeviceProvider>> DeviceProviderExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_device_provider_get_devices")]
+    #[doc(alias = "get_devices")]
     fn devices(&self) -> glib::List<crate::Device> {
         unsafe {
             FromGlibPtrContainer::from_glib_full(ffi::gst_device_provider_get_devices(
@@ -63,3 +62,5 @@ impl<O: IsA<DeviceProvider>> DeviceProviderExtManual for O {
         }
     }
 }
+
+impl<O: IsA<DeviceProvider>> DeviceProviderExtManual for O {}

gstreamer/src/element.rs

@@ -101,203 +101,13 @@ impl FromGlib<libc::c_ulong> for NotifyWatchId {
     }
 }
 
-pub trait ElementExtManual: 'static {
-    #[doc(alias = "get_element_class")]
-    fn element_class(&self) -> &glib::Class<Element>;
-
-    #[doc(alias = "get_current_state")]
-    fn current_state(&self) -> State;
-
-    #[doc(alias = "get_pending_state")]
-    fn pending_state(&self) -> State;
-
-    #[doc(alias = "gst_element_query")]
-    fn query(&self, query: &mut QueryRef) -> bool;
-
-    #[doc(alias = "gst_element_send_event")]
-    fn send_event(&self, event: impl Into<Event>) -> bool;
-
-    #[doc(alias = "get_metadata")]
-    fn metadata<'a>(&self, key: &str) -> Option<&'a str>;
-
-    #[doc(alias = "get_pad_template")]
-    fn pad_template(&self, name: &str) -> Option<PadTemplate>;
-    #[doc(alias = "get_pad_template_list")]
-    fn pad_template_list(&self) -> glib::List<PadTemplate>;
-
-    #[allow(clippy::too_many_arguments)]
-    #[doc(alias = "gst_element_message_full")]
-    fn message_full<T: crate::MessageErrorDomain>(
-        &self,
-        type_: ElementMessageType,
-        code: T,
-        message: Option<&str>,
-        debug: Option<&str>,
-        file: &str,
-        function: &str,
-        line: u32,
-    );
-
-    fn set_element_flags(&self, flags: ElementFlags);
-
-    fn unset_element_flags(&self, flags: ElementFlags);
-
-    #[doc(alias = "get_element_flags")]
-    fn element_flags(&self) -> ElementFlags;
-
-    #[allow(clippy::too_many_arguments)]
-    #[doc(alias = "gst_element_message_full_with_details")]
-    fn message_full_with_details<T: crate::MessageErrorDomain>(
-        &self,
-        type_: ElementMessageType,
-        code: T,
-        message: Option<&str>,
-        debug: Option<&str>,
-        file: &str,
-        function: &str,
-        line: u32,
-        structure: crate::Structure,
-    );
-
-    fn post_error_message(&self, msg: crate::ErrorMessage);
-
-    #[doc(alias = "gst_element_iterate_pads")]
-    fn iterate_pads(&self) -> crate::Iterator<Pad>;
-    #[doc(alias = "gst_element_iterate_sink_pads")]
-    fn iterate_sink_pads(&self) -> crate::Iterator<Pad>;
-    #[doc(alias = "gst_element_iterate_src_pads")]
-    fn iterate_src_pads(&self) -> crate::Iterator<Pad>;
-
-    #[doc(alias = "get_pads")]
-    #[doc(alias = "gst_element_foreach_pad")]
-    fn pads(&self) -> Vec<Pad>;
-    #[doc(alias = "get_sink_pads")]
-    #[doc(alias = "gst_element_foreach_sink_pad")]
-    fn sink_pads(&self) -> Vec<Pad>;
-    #[doc(alias = "get_src_pads")]
-    #[doc(alias = "gst_element_foreach_src_pad")]
-    fn src_pads(&self) -> Vec<Pad>;
-
-    fn num_pads(&self) -> u16;
-    fn num_sink_pads(&self) -> u16;
-    fn num_src_pads(&self) -> u16;
-
-    #[doc(alias = "gst_element_add_property_deep_notify_watch")]
-    fn add_property_deep_notify_watch(
-        &self,
-        property_name: Option<&str>,
-        include_value: bool,
-    ) -> NotifyWatchId;
-
-    #[doc(alias = "gst_element_add_property_notify_watch")]
-    fn add_property_notify_watch(
-        &self,
-        property_name: Option<&str>,
-        include_value: bool,
-    ) -> NotifyWatchId;
-
-    #[doc(alias = "gst_element_remove_property_notify_watch")]
-    fn remove_property_notify_watch(&self, watch_id: NotifyWatchId);
-
-    #[doc(alias = "gst_element_query_convert")]
-    fn query_convert<U: SpecificFormattedValueFullRange>(
-        &self,
-        src_val: impl FormattedValue,
-    ) -> Option<U>;
-    fn query_convert_generic(
-        &self,
-        src_val: impl FormattedValue,
-        dest_format: Format,
-    ) -> Option<GenericFormattedValue>;
-
-    #[doc(alias = "gst_element_query_duration")]
-    fn query_duration<T: SpecificFormattedValueIntrinsic>(&self) -> Option<T>;
-    #[doc(alias = "gst_element_query_duration")]
-    fn query_duration_generic(&self, format: Format) -> Option<GenericFormattedValue>;
-
-    #[doc(alias = "gst_element_query_position")]
-    fn query_position<T: SpecificFormattedValueIntrinsic>(&self) -> Option<T>;
-    #[doc(alias = "gst_element_query_position")]
-    fn query_position_generic(&self, format: Format) -> Option<GenericFormattedValue>;
-
-    #[doc(alias = "gst_element_seek")]
-    fn seek<V: FormattedValue>(
-        &self,
-        rate: f64,
-        flags: crate::SeekFlags,
-        start_type: crate::SeekType,
-        start: V,
-        stop_type: crate::SeekType,
-        stop: impl CompatibleFormattedValue<V>,
-    ) -> Result<(), glib::error::BoolError>;
-    #[doc(alias = "gst_element_seek_simple")]
-    fn seek_simple(
-        &self,
-        seek_flags: crate::SeekFlags,
-        seek_pos: impl FormattedValue,
-    ) -> Result<(), glib::error::BoolError>;
-
-    #[doc(alias = "gst_element_call_async")]
-    fn call_async<F>(&self, func: F)
-    where
-        F: FnOnce(&Self) + Send + 'static;
-
-    fn call_async_future<F, T>(&self, func: F) -> Pin<Box<dyn Future<Output = T> + Send + 'static>>
-    where
-        F: FnOnce(&Self) -> T + Send + 'static,
-        T: Send + 'static;
-
-    #[doc(alias = "get_current_running_time")]
-    #[doc(alias = "gst_element_get_current_running_time")]
-    fn current_running_time(&self) -> Option<crate::ClockTime>;
-
-    #[doc(alias = "get_current_clock_time")]
-    #[doc(alias = "gst_element_get_current_clock_time")]
-    fn current_clock_time(&self) -> Option<crate::ClockTime>;
-
-    #[doc(alias = "gst_element_get_request_pad")]
-    #[doc(alias = "get_request_pad")]
-    #[doc(alias = "gst_element_request_pad_simple")]
-    fn request_pad_simple(&self, name: &str) -> Option<Pad>;
-
-    #[doc(alias = "gst_element_link")]
-    fn link(&self, dest: &impl IsA<Element>) -> Result<(), glib::error::BoolError>;
-
-    #[doc(alias = "gst_element_link_filtered")]
-    fn link_filtered(
-        &self,
-        dest: &impl IsA<Element>,
-        filter: &crate::Caps,
-    ) -> Result<(), glib::error::BoolError>;
-
-    #[doc(alias = "gst_element_link_pads")]
-    fn link_pads(
-        &self,
-        srcpadname: Option<&str>,
-        dest: &impl IsA<Element>,
-        destpadname: Option<&str>,
-    ) -> Result<(), glib::error::BoolError>;
-
-    #[doc(alias = "gst_element_link_pads_filtered")]
-    fn link_pads_filtered(
-        &self,
-        srcpadname: Option<&str>,
-        dest: &impl IsA<Element>,
-        destpadname: Option<&str>,
-        filter: &crate::Caps,
-    ) -> Result<(), glib::error::BoolError>;
-
-    #[doc(alias = "gst_element_link_pads_full")]
-    fn link_pads_full(
-        &self,
-        srcpadname: Option<&str>,
-        dest: &impl IsA<Element>,
-        destpadname: Option<&str>,
-        flags: crate::PadLinkCheck,
-    ) -> Result<(), glib::error::BoolError>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::Element>> Sealed for T {}
 }
 
-impl<O: IsA<Element>> ElementExtManual for O {
+pub trait ElementExtManual: sealed::Sealed + IsA<Element> + 'static {
+    #[doc(alias = "get_element_class")]
     #[inline]
     fn element_class(&self) -> &glib::Class<Element> {
         unsafe {
@@ -307,14 +117,17 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "get_current_state")]
     fn current_state(&self) -> State {
         self.state(Some(ClockTime::ZERO)).1
     }
 
+    #[doc(alias = "get_pending_state")]
     fn pending_state(&self) -> State {
         self.state(Some(ClockTime::ZERO)).2
     }
 
+    #[doc(alias = "gst_element_query")]
     fn query(&self, query: &mut QueryRef) -> bool {
         unsafe {
             from_glib(ffi::gst_element_query(
@@ -324,6 +137,7 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_element_send_event")]
     fn send_event(&self, event: impl Into<Event>) -> bool {
         unsafe {
             from_glib(ffi::gst_element_send_event(
@@ -333,42 +147,26 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "get_metadata")]
+    #[doc(alias = "gst_element_class_get_metadata")]
     fn metadata<'a>(&self, key: &str) -> Option<&'a str> {
         self.element_class().metadata(key)
     }
 
+    #[doc(alias = "get_pad_template")]
+    #[doc(alias = "gst_element_class_get_pad_template")]
     fn pad_template(&self, name: &str) -> Option<PadTemplate> {
         self.element_class().pad_template(name)
     }
 
+    #[doc(alias = "get_pad_template_list")]
+    #[doc(alias = "gst_element_class_get_pad_template_list")]
     fn pad_template_list(&self) -> glib::List<PadTemplate> {
         self.element_class().pad_template_list()
     }
 
-    fn set_element_flags(&self, flags: ElementFlags) {
-        unsafe {
-            let ptr: *mut ffi::GstObject = self.as_ptr() as *mut _;
-            let _guard = self.as_ref().object_lock();
-            (*ptr).flags |= flags.into_glib();
-        }
-    }
-
-    fn unset_element_flags(&self, flags: ElementFlags) {
-        unsafe {
-            let ptr: *mut ffi::GstObject = self.as_ptr() as *mut _;
-            let _guard = self.as_ref().object_lock();
-            (*ptr).flags &= !flags.into_glib();
-        }
-    }
-
-    fn element_flags(&self) -> ElementFlags {
-        unsafe {
-            let ptr: *mut ffi::GstObject = self.as_ptr() as *mut _;
-            let _guard = self.as_ref().object_lock();
-            from_glib((*ptr).flags)
-        }
-    }
-
+    #[allow(clippy::too_many_arguments)]
+    #[doc(alias = "gst_element_message_full")]
     fn message_full<T: crate::MessageErrorDomain>(
         &self,
         type_: ElementMessageType,
@@ -400,6 +198,33 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    fn set_element_flags(&self, flags: ElementFlags) {
+        unsafe {
+            let ptr: *mut ffi::GstObject = self.as_ptr() as *mut _;
+            let _guard = self.as_ref().object_lock();
+            (*ptr).flags |= flags.into_glib();
+        }
+    }
+
+    fn unset_element_flags(&self, flags: ElementFlags) {
+        unsafe {
+            let ptr: *mut ffi::GstObject = self.as_ptr() as *mut _;
+            let _guard = self.as_ref().object_lock();
+            (*ptr).flags &= !flags.into_glib();
+        }
+    }
+
+    #[doc(alias = "get_element_flags")]
+    fn element_flags(&self) -> ElementFlags {
+        unsafe {
+            let ptr: *mut ffi::GstObject = self.as_ptr() as *mut _;
+            let _guard = self.as_ref().object_lock();
+            from_glib((*ptr).flags)
+        }
+    }
+
+    #[allow(clippy::too_many_arguments)]
+    #[doc(alias = "gst_element_message_full_with_details")]
     fn message_full_with_details<T: crate::MessageErrorDomain>(
         &self,
         type_: ElementMessageType,
@@ -459,6 +284,7 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_element_iterate_pads")]
     fn iterate_pads(&self) -> crate::Iterator<Pad> {
         unsafe {
             from_glib_full(ffi::gst_element_iterate_pads(
@@ -467,6 +293,7 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_element_iterate_sink_pads")]
     fn iterate_sink_pads(&self) -> crate::Iterator<Pad> {
         unsafe {
             from_glib_full(ffi::gst_element_iterate_sink_pads(
@@ -475,6 +302,7 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_element_iterate_src_pads")]
     fn iterate_src_pads(&self) -> crate::Iterator<Pad> {
         unsafe {
             from_glib_full(ffi::gst_element_iterate_src_pads(
@@ -483,6 +311,8 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "get_pads")]
+    #[doc(alias = "gst_element_foreach_pad")]
     fn pads(&self) -> Vec<Pad> {
         unsafe {
             let elt: &ffi::GstElement = &*(self.as_ptr() as *const _);
@@ -491,6 +321,8 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "get_sink_pads")]
+    #[doc(alias = "gst_element_foreach_sink_pad")]
     fn sink_pads(&self) -> Vec<Pad> {
         unsafe {
             let elt: &ffi::GstElement = &*(self.as_ptr() as *const _);
@@ -499,6 +331,8 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "get_src_pads")]
+    #[doc(alias = "gst_element_foreach_src_pad")]
     fn src_pads(&self) -> Vec<Pad> {
         unsafe {
             let elt: &ffi::GstElement = &*(self.as_ptr() as *const _);
@@ -531,6 +365,7 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_element_add_property_deep_notify_watch")]
     fn add_property_deep_notify_watch(
         &self,
         property_name: Option<&str>,
@@ -546,6 +381,7 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_element_add_property_notify_watch")]
     fn add_property_notify_watch(
         &self,
         property_name: Option<&str>,
@@ -561,6 +397,7 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_element_remove_property_notify_watch")]
     fn remove_property_notify_watch(&self, watch_id: NotifyWatchId) {
         unsafe {
             ffi::gst_element_remove_property_notify_watch(
@@ -570,6 +407,7 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_element_query_convert")]
     fn query_convert<U: SpecificFormattedValueFullRange>(
         &self,
         src_val: impl FormattedValue,
@@ -591,6 +429,7 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_element_query_convert")]
     fn query_convert_generic(
         &self,
         src_val: impl FormattedValue,
@@ -616,6 +455,7 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_element_query_duration")]
     fn query_duration<T: SpecificFormattedValueIntrinsic>(&self) -> Option<T> {
         unsafe {
             let mut duration = mem::MaybeUninit::uninit();
@@ -632,6 +472,7 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_element_query_duration")]
     fn query_duration_generic(&self, format: Format) -> Option<GenericFormattedValue> {
         unsafe {
             let mut duration = mem::MaybeUninit::uninit();
@@ -648,6 +489,7 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_element_query_position")]
     fn query_position<T: SpecificFormattedValueIntrinsic>(&self) -> Option<T> {
         unsafe {
             let mut cur = mem::MaybeUninit::uninit();
@@ -664,6 +506,7 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_element_query_position")]
     fn query_position_generic(&self, format: Format) -> Option<GenericFormattedValue> {
         unsafe {
             let mut cur = mem::MaybeUninit::uninit();
@@ -680,6 +523,7 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_element_seek")]
     fn seek<V: FormattedValue>(
         &self,
         rate: f64,
@@ -708,6 +552,7 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_element_seek_simple")]
     fn seek_simple(
         &self,
         seek_flags: crate::SeekFlags,
@@ -726,6 +571,7 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_element_call_async")]
     fn call_async<F>(&self, func: F)
     where
         F: FnOnce(&Self) + Send + 'static,
@@ -774,6 +620,8 @@ impl<O: IsA<Element>> ElementExtManual for O {
         Box::pin(async move { receiver.await.expect("sender dropped") })
     }
 
+    #[doc(alias = "get_current_running_time")]
+    #[doc(alias = "gst_element_get_current_running_time")]
     fn current_running_time(&self) -> Option<crate::ClockTime> {
         let base_time = self.base_time();
         let clock_time = self.current_clock_time();
@@ -783,6 +631,8 @@ impl<O: IsA<Element>> ElementExtManual for O {
             .and_then(|(ct, bt)| ct.checked_sub(bt))
     }
 
+    #[doc(alias = "get_current_clock_time")]
+    #[doc(alias = "gst_element_get_current_clock_time")]
     fn current_clock_time(&self) -> Option<crate::ClockTime> {
         if let Some(clock) = self.clock() {
             clock.time()
@@ -791,6 +641,9 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_element_get_request_pad")]
+    #[doc(alias = "get_request_pad")]
+    #[doc(alias = "gst_element_request_pad_simple")]
     fn request_pad_simple(&self, name: &str) -> Option<Pad> {
         unsafe {
             #[cfg(feature = "v1_20")]
@@ -810,6 +663,7 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_element_link")]
     fn link(&self, dest: &impl IsA<Element>) -> Result<(), glib::error::BoolError> {
         unsafe {
             glib::result_from_gboolean!(
@@ -824,6 +678,7 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_element_link_filtered")]
     fn link_filtered(
         &self,
         dest: &impl IsA<Element>,
@@ -844,6 +699,7 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_element_link_pads")]
     fn link_pads(
         &self,
         srcpadname: Option<&str>,
@@ -873,6 +729,7 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_element_link_pads_filtered")]
     fn link_pads_filtered(
         &self,
         srcpadname: Option<&str>,
@@ -905,6 +762,7 @@ impl<O: IsA<Element>> ElementExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_element_link_pads_full")]
     fn link_pads_full(
         &self,
         srcpadname: Option<&str>,
@@ -938,6 +796,8 @@ impl<O: IsA<Element>> ElementExtManual for O {
     }
 }
 
+impl<O: IsA<Element>> ElementExtManual for O {}
+
 pub unsafe trait ElementClassExt {
     #[doc(alias = "get_metadata")]
     #[doc(alias = "gst_element_class_get_metadata")]

gstreamer/src/gobject.rs

@@ -4,12 +4,13 @@ use glib::prelude::*;
 
 use crate::value::GstValueExt;
 
-pub trait GObjectExtManualGst: 'static {
-    #[doc(alias = "gst_util_set_object_arg")]
-    fn set_property_from_str(&self, name: &str, value: &str);
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<glib::Object>> Sealed for T {}
 }
 
-impl<O: IsA<glib::Object>> GObjectExtManualGst for O {
+pub trait GObjectExtManualGst: sealed::Sealed + IsA<glib::Object> + 'static {
+    #[doc(alias = "gst_util_set_object_arg")]
     #[track_caller]
     fn set_property_from_str(&self, name: &str, value: &str) {
         let pspec = self.find_property(name).unwrap_or_else(|| {
@@ -49,6 +50,8 @@ impl<O: IsA<glib::Object>> GObjectExtManualGst for O {
     }
 }
 
+impl<O: IsA<glib::Object>> GObjectExtManualGst for O {}
+
 #[cfg(test)]
 mod tests {
     use super::*;

gstreamer/src/object.rs

@@ -2,37 +2,15 @@
 
 use glib::{prelude::*, signal::SignalHandlerId, translate::*};
 
-use crate::{ClockTime, ObjectFlags};
+use crate::{ClockTime, Object, ObjectFlags};
 
-pub trait GstObjectExtManual: 'static {
-    #[doc(alias = "deep-notify")]
-    fn connect_deep_notify<F: Fn(&Self, &crate::Object, &glib::ParamSpec) + Send + Sync + 'static>(
-        &self,
-        name: Option<&str>,
-        f: F,
-    ) -> SignalHandlerId;
-
-    fn set_object_flags(&self, flags: ObjectFlags);
-
-    fn unset_object_flags(&self, flags: ObjectFlags);
-
-    #[doc(alias = "get_object_flags")]
-    fn object_flags(&self) -> ObjectFlags;
-
-    #[doc(alias = "get_g_value_array")]
-    #[doc(alias = "gst_object_get_g_value_array")]
-    fn g_value_array(
-        &self,
-        property_name: &str,
-        timestamp: ClockTime,
-        interval: ClockTime,
-        values: &mut [glib::Value],
-    ) -> Result<(), glib::error::BoolError>;
-
-    fn object_lock(&self) -> crate::utils::ObjectLockGuard<Self>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::Object>> Sealed for T {}
 }
 
-impl<O: IsA<crate::Object>> GstObjectExtManual for O {
+pub trait GstObjectExtManual: sealed::Sealed + IsA<Object> + 'static {
+    #[doc(alias = "deep-notify")]
     fn connect_deep_notify<
         F: Fn(&Self, &crate::Object, &glib::ParamSpec) + Send + Sync + 'static,
     >(
@@ -53,7 +31,7 @@ impl<O: IsA<crate::Object>> GstObjectExtManual for O {
             // It would be nice to display the actual signal name in the panic messages below,
             // but that would require to copy `signal_name` so as to move it into the closure
             // which seems too much for the messages of development errors
-            let obj: O = unsafe {
+            let obj: Self = unsafe {
                 values[0]
                     .get::<crate::Object>()
                     .unwrap_or_else(|err| panic!("Object signal \"deep-notify\": values[0]: {err}"))
@@ -90,6 +68,7 @@ impl<O: IsA<crate::Object>> GstObjectExtManual for O {
         }
     }
 
+    #[doc(alias = "get_object_flags")]
     fn object_flags(&self) -> ObjectFlags {
         unsafe {
             let ptr: *mut ffi::GstObject = self.as_ptr() as *mut _;
@@ -98,6 +77,9 @@ impl<O: IsA<crate::Object>> GstObjectExtManual for O {
         }
     }
 
+    #[doc(alias = "get_g_value_array")]
+    #[doc(alias = "gst_object_get_g_value_array")]
+
     fn g_value_array(
         &self,
         property_name: &str,
@@ -127,6 +109,8 @@ impl<O: IsA<crate::Object>> GstObjectExtManual for O {
     }
 }
 
+impl<O: IsA<Object>> GstObjectExtManual for O {}
+
 #[cfg(test)]
 mod tests {
     use std::sync::{Arc, Mutex};

gstreamer/src/pad.rs

@@ -95,217 +95,13 @@ pub enum EventForeachAction {
     Replace(Event),
 }
 
-pub trait PadExtManual: 'static {
-    #[doc(alias = "gst_pad_add_probe")]
-    fn add_probe<F>(&self, mask: PadProbeType, func: F) -> Option<PadProbeId>
-    where
-        F: Fn(&Self, &mut PadProbeInfo) -> PadProbeReturn + Send + Sync + 'static;
-    #[doc(alias = "gst_pad_remove_probe")]
-    fn remove_probe(&self, id: PadProbeId);
-
-    #[doc(alias = "gst_pad_pull_range")]
-    fn pull_range(&self, offset: u64, size: u32) -> Result<Buffer, FlowError>;
-    fn pull_range_fill(
-        &self,
-        offset: u64,
-        buffer: &mut crate::BufferRef,
-        size: u32,
-    ) -> Result<(), FlowError>;
-    #[doc(alias = "get_range")]
-    #[doc(alias = "gst_pad_get_range")]
-    fn range(&self, offset: u64, size: u32) -> Result<Buffer, FlowError>;
-    #[doc(alias = "get_range_fill")]
-    fn range_fill(
-        &self,
-        offset: u64,
-        buffer: &mut crate::BufferRef,
-        size: u32,
-    ) -> Result<(), FlowError>;
-
-    #[doc(alias = "gst_pad_peer_query")]
-    fn peer_query(&self, query: &mut QueryRef) -> bool;
-    #[doc(alias = "gst_pad_query")]
-    fn query(&self, query: &mut QueryRef) -> bool;
-    fn proxy_query_caps(&self, query: &mut QueryRef) -> bool;
-    #[doc(alias = "gst_pad_proxy_query_accept_caps")]
-    fn proxy_query_accept_caps(&self, query: &mut QueryRef) -> bool;
-
-    #[doc(alias = "gst_pad_push_event")]
-    fn push_event(&self, event: impl Into<Event>) -> bool;
-    #[doc(alias = "gst_pad_send_event")]
-    fn send_event(&self, event: impl Into<Event>) -> bool;
-
-    #[doc(alias = "gst_pad_iterate_internal_links")]
-    fn iterate_internal_links(&self) -> crate::Iterator<Pad>;
-
-    fn stream_lock(&self) -> StreamLock;
-
-    #[doc(alias = "gst_pad_set_activate_function")]
-    #[doc(alias = "gst_pad_set_activate_function_full")]
-    unsafe fn set_activate_function<F>(&self, func: F)
-    where
-        F: Fn(&Self, Option<&crate::Object>) -> Result<(), LoggableError> + Send + Sync + 'static;
-
-    #[doc(alias = "gst_pad_set_activatemode_function")]
-    #[doc(alias = "gst_pad_set_activatemode_function_full")]
-    unsafe fn set_activatemode_function<F>(&self, func: F)
-    where
-        F: Fn(&Self, Option<&crate::Object>, crate::PadMode, bool) -> Result<(), LoggableError>
-            + Send
-            + Sync
-            + 'static;
-
-    #[doc(alias = "gst_pad_set_chain_function")]
-    #[doc(alias = "gst_pad_set_chain_function_full")]
-    unsafe fn set_chain_function<F>(&self, func: F)
-    where
-        F: Fn(&Self, Option<&crate::Object>, crate::Buffer) -> Result<FlowSuccess, FlowError>
-            + Send
-            + Sync
-            + 'static;
-
-    #[doc(alias = "gst_pad_set_chain_list_function")]
-    #[doc(alias = "gst_pad_set_chain_list_function_full")]
-    unsafe fn set_chain_list_function<F>(&self, func: F)
-    where
-        F: Fn(&Self, Option<&crate::Object>, crate::BufferList) -> Result<FlowSuccess, FlowError>
-            + Send
-            + Sync
-            + 'static;
-
-    #[doc(alias = "gst_pad_set_event_function")]
-    #[doc(alias = "gst_pad_set_event_function_full")]
-    unsafe fn set_event_function<F>(&self, func: F)
-    where
-        F: Fn(&Self, Option<&crate::Object>, crate::Event) -> bool + Send + Sync + 'static;
-
-    #[doc(alias = "gst_pad_set_event_full_function")]
-    #[doc(alias = "gst_pad_set_event_full_function_full")]
-    unsafe fn set_event_full_function<F>(&self, func: F)
-    where
-        F: Fn(&Self, Option<&crate::Object>, crate::Event) -> Result<FlowSuccess, FlowError>
-            + Send
-            + Sync
-            + 'static;
-
-    #[doc(alias = "gst_pad_set_getrange_function")]
-    #[doc(alias = "gst_pad_set_getrange_function_full")]
-    unsafe fn set_getrange_function<F>(&self, func: F)
-    where
-        F: Fn(
-                &Self,
-                Option<&crate::Object>,
-                u64,
-                Option<&mut crate::BufferRef>,
-                u32,
-            ) -> Result<PadGetRangeSuccess, crate::FlowError>
-            + Send
-            + Sync
-            + 'static;
-
-    #[doc(alias = "gst_pad_set_iterate_internal_links_function")]
-    #[doc(alias = "gst_pad_set_iterate_internal_links_function_full")]
-    unsafe fn set_iterate_internal_links_function<F>(&self, func: F)
-    where
-        F: Fn(&Self, Option<&crate::Object>) -> crate::Iterator<Pad> + Send + Sync + 'static;
-
-    #[doc(alias = "gst_pad_set_link_function")]
-    #[doc(alias = "gst_pad_set_link_function_full")]
-    unsafe fn set_link_function<F>(&self, func: F)
-    where
-        F: Fn(
-                &Self,
-                Option<&crate::Object>,
-                &Pad,
-            ) -> Result<crate::PadLinkSuccess, crate::PadLinkError>
-            + Send
-            + Sync
-            + 'static;
-
-    #[doc(alias = "gst_pad_set_query_function")]
-    #[doc(alias = "gst_pad_set_query_function_full")]
-    unsafe fn set_query_function<F>(&self, func: F)
-    where
-        F: Fn(&Self, Option<&crate::Object>, &mut crate::QueryRef) -> bool + Send + Sync + 'static;
-
-    #[doc(alias = "gst_pad_set_unlink_function")]
-    #[doc(alias = "gst_pad_set_unlink_function_full")]
-    unsafe fn set_unlink_function<F>(&self, func: F)
-    where
-        F: Fn(&Self, Option<&crate::Object>) + Send + Sync + 'static;
-
-    #[doc(alias = "gst_pad_start_task")]
-    fn start_task<F: FnMut() + Send + 'static>(&self, func: F) -> Result<(), glib::BoolError>;
-
-    #[doc(alias = "gst_pad_peer_query_convert")]
-    fn peer_query_convert<U: SpecificFormattedValueFullRange>(
-        &self,
-        src_val: impl FormattedValue,
-    ) -> Option<U>;
-    #[doc(alias = "gst_pad_peer_query_convert")]
-    fn peer_query_convert_generic(
-        &self,
-        src_val: impl FormattedValue,
-        dest_format: Format,
-    ) -> Option<GenericFormattedValue>;
-
-    #[doc(alias = "gst_pad_peer_query_duration")]
-    fn peer_query_duration<T: SpecificFormattedValueIntrinsic>(&self) -> Option<T>;
-    #[doc(alias = "gst_pad_peer_query_duration")]
-    fn peer_query_duration_generic(&self, format: Format) -> Option<GenericFormattedValue>;
-
-    #[doc(alias = "gst_pad_peer_query_position")]
-    fn peer_query_position<T: SpecificFormattedValueIntrinsic>(&self) -> Option<T>;
-    #[doc(alias = "gst_pad_peer_query_position")]
-    fn peer_query_position_generic(&self, format: Format) -> Option<GenericFormattedValue>;
-
-    #[doc(alias = "gst_pad_query_convert")]
-    fn query_convert<U: SpecificFormattedValueFullRange>(
-        &self,
-        src_val: impl FormattedValue,
-    ) -> Option<U>;
-    #[doc(alias = "gst_pad_query_convert")]
-    fn query_convert_generic(
-        &self,
-        src_val: impl FormattedValue,
-        dest_format: Format,
-    ) -> Option<GenericFormattedValue>;
-
-    #[doc(alias = "gst_pad_query_duration")]
-    fn query_duration<T: SpecificFormattedValueIntrinsic>(&self) -> Option<T>;
-    #[doc(alias = "gst_pad_query_duration")]
-    fn query_duration_generic(&self, format: Format) -> Option<GenericFormattedValue>;
-
-    #[doc(alias = "gst_pad_query_position")]
-    fn query_position<T: SpecificFormattedValueIntrinsic>(&self) -> Option<T>;
-    #[doc(alias = "gst_pad_query_position")]
-    fn query_position_generic(&self, format: Format) -> Option<GenericFormattedValue>;
-
-    #[doc(alias = "get_mode")]
-    #[doc(alias = "GST_PAD_MODE")]
-    fn mode(&self) -> crate::PadMode;
-
-    #[doc(alias = "gst_pad_sticky_events_foreach")]
-    fn sticky_events_foreach<
-        F: FnMut(&Event) -> ControlFlow<EventForeachAction, EventForeachAction>,
-    >(
-        &self,
-        func: F,
-    );
-
-    #[doc(alias = "gst_pad_get_sticky_event")]
-    #[doc(alias = "get_sticky_event")]
-    fn sticky_event<T: crate::event::StickyEventType>(&self, idx: u32) -> Option<T::Owned>;
-
-    fn set_pad_flags(&self, flags: PadFlags);
-
-    fn unset_pad_flags(&self, flags: PadFlags);
-
-    #[doc(alias = "get_pad_flags")]
-    fn pad_flags(&self) -> PadFlags;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::Pad>> Sealed for T {}
 }
 
-impl<O: IsA<Pad>> PadExtManual for O {
+pub trait PadExtManual: sealed::Sealed + IsA<Pad> + 'static {
+    #[doc(alias = "gst_pad_add_probe")]
     fn add_probe<F>(&self, mask: PadProbeType, func: F) -> Option<PadProbeId>
     where
         F: Fn(&Self, &mut PadProbeInfo) -> PadProbeReturn + Send + Sync + 'static,
@@ -328,52 +124,14 @@ impl<O: IsA<Pad>> PadExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_pad_remove_probe")]
     fn remove_probe(&self, id: PadProbeId) {
         unsafe {
             ffi::gst_pad_remove_probe(self.as_ref().to_glib_none().0, id.into_glib());
         }
     }
 
-    fn range(&self, offset: u64, size: u32) -> Result<Buffer, FlowError> {
-        unsafe {
-            let mut buffer = ptr::null_mut();
-            FlowSuccess::try_from_glib(ffi::gst_pad_get_range(
-                self.as_ref().to_glib_none().0,
-                offset,
-                size,
-                &mut buffer,
-            ))
-            .map(|_| from_glib_full(buffer))
-        }
-    }
-
-    fn range_fill(
-        &self,
-        offset: u64,
-        buffer: &mut crate::BufferRef,
-        size: u32,
-    ) -> Result<(), FlowError> {
-        assert!(buffer.size() >= size as usize);
-
-        unsafe {
-            let mut buffer_ref = buffer.as_mut_ptr();
-            FlowSuccess::try_from_glib(ffi::gst_pad_get_range(
-                self.as_ref().to_glib_none().0,
-                offset,
-                size,
-                &mut buffer_ref,
-            ))
-            .and_then(|_| {
-                if buffer.as_mut_ptr() != buffer_ref {
-                    ffi::gst_mini_object_unref(buffer_ref as *mut _);
-                    Err(crate::FlowError::Error)
-                } else {
-                    Ok(())
-                }
-            })
-        }
-    }
-
+    #[doc(alias = "gst_pad_pull_range")]
     fn pull_range(&self, offset: u64, size: u32) -> Result<Buffer, FlowError> {
         unsafe {
             let mut buffer = ptr::null_mut();
@@ -414,15 +172,50 @@ impl<O: IsA<Pad>> PadExtManual for O {
         }
     }
 
-    fn query(&self, query: &mut QueryRef) -> bool {
+    #[doc(alias = "get_range")]
+    #[doc(alias = "gst_pad_get_range")]
+    fn range(&self, offset: u64, size: u32) -> Result<Buffer, FlowError> {
         unsafe {
-            from_glib(ffi::gst_pad_query(
+            let mut buffer = ptr::null_mut();
+            FlowSuccess::try_from_glib(ffi::gst_pad_get_range(
                 self.as_ref().to_glib_none().0,
-                query.as_mut_ptr(),
+                offset,
+                size,
+                &mut buffer,
             ))
+            .map(|_| from_glib_full(buffer))
         }
     }
 
+    #[doc(alias = "get_range_fill")]
+    fn range_fill(
+        &self,
+        offset: u64,
+        buffer: &mut crate::BufferRef,
+        size: u32,
+    ) -> Result<(), FlowError> {
+        assert!(buffer.size() >= size as usize);
+
+        unsafe {
+            let mut buffer_ref = buffer.as_mut_ptr();
+            FlowSuccess::try_from_glib(ffi::gst_pad_get_range(
+                self.as_ref().to_glib_none().0,
+                offset,
+                size,
+                &mut buffer_ref,
+            ))
+            .and_then(|_| {
+                if buffer.as_mut_ptr() != buffer_ref {
+                    ffi::gst_mini_object_unref(buffer_ref as *mut _);
+                    Err(crate::FlowError::Error)
+                } else {
+                    Ok(())
+                }
+            })
+        }
+    }
+
+    #[doc(alias = "gst_pad_peer_query")]
     fn peer_query(&self, query: &mut QueryRef) -> bool {
         unsafe {
             from_glib(ffi::gst_pad_peer_query(
@@ -432,9 +225,10 @@ impl<O: IsA<Pad>> PadExtManual for O {
         }
     }
 
-    fn proxy_query_accept_caps(&self, query: &mut QueryRef) -> bool {
+    #[doc(alias = "gst_pad_query")]
+    fn query(&self, query: &mut QueryRef) -> bool {
         unsafe {
-            from_glib(ffi::gst_pad_proxy_query_accept_caps(
+            from_glib(ffi::gst_pad_query(
                 self.as_ref().to_glib_none().0,
                 query.as_mut_ptr(),
             ))
@@ -450,6 +244,17 @@ impl<O: IsA<Pad>> PadExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_pad_proxy_query_accept_caps")]
+    fn proxy_query_accept_caps(&self, query: &mut QueryRef) -> bool {
+        unsafe {
+            from_glib(ffi::gst_pad_proxy_query_accept_caps(
+                self.as_ref().to_glib_none().0,
+                query.as_mut_ptr(),
+            ))
+        }
+    }
+
+    #[doc(alias = "gst_pad_push_event")]
     fn push_event(&self, event: impl Into<Event>) -> bool {
         unsafe {
             from_glib(ffi::gst_pad_push_event(
@@ -459,6 +264,7 @@ impl<O: IsA<Pad>> PadExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_pad_send_event")]
     fn send_event(&self, event: impl Into<Event>) -> bool {
         unsafe {
             from_glib(ffi::gst_pad_send_event(
@@ -468,6 +274,7 @@ impl<O: IsA<Pad>> PadExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_pad_iterate_internal_links")]
     fn iterate_internal_links(&self) -> crate::Iterator<Pad> {
         unsafe {
             from_glib_full(ffi::gst_pad_iterate_internal_links(
@@ -484,6 +291,8 @@ impl<O: IsA<Pad>> PadExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_pad_set_activate_function")]
+    #[doc(alias = "gst_pad_set_activate_function_full")]
     unsafe fn set_activate_function<F>(&self, func: F)
     where
         F: Fn(&Self, Option<&crate::Object>) -> Result<(), LoggableError> + Send + Sync + 'static,
@@ -497,6 +306,8 @@ impl<O: IsA<Pad>> PadExtManual for O {
         );
     }
 
+    #[doc(alias = "gst_pad_set_activatemode_function")]
+    #[doc(alias = "gst_pad_set_activatemode_function_full")]
     unsafe fn set_activatemode_function<F>(&self, func: F)
     where
         F: Fn(&Self, Option<&crate::Object>, crate::PadMode, bool) -> Result<(), LoggableError>
@@ -513,6 +324,8 @@ impl<O: IsA<Pad>> PadExtManual for O {
         );
     }
 
+    #[doc(alias = "gst_pad_set_chain_function")]
+    #[doc(alias = "gst_pad_set_chain_function_full")]
     unsafe fn set_chain_function<F>(&self, func: F)
     where
         F: Fn(&Self, Option<&crate::Object>, crate::Buffer) -> Result<FlowSuccess, FlowError>
@@ -529,6 +342,8 @@ impl<O: IsA<Pad>> PadExtManual for O {
         );
     }
 
+    #[doc(alias = "gst_pad_set_chain_list_function")]
+    #[doc(alias = "gst_pad_set_chain_list_function_full")]
     unsafe fn set_chain_list_function<F>(&self, func: F)
     where
         F: Fn(&Self, Option<&crate::Object>, crate::BufferList) -> Result<FlowSuccess, FlowError>
@@ -545,6 +360,8 @@ impl<O: IsA<Pad>> PadExtManual for O {
         );
     }
 
+    #[doc(alias = "gst_pad_set_event_function")]
+    #[doc(alias = "gst_pad_set_event_function_full")]
     unsafe fn set_event_function<F>(&self, func: F)
     where
         F: Fn(&Self, Option<&crate::Object>, crate::Event) -> bool + Send + Sync + 'static,
@@ -558,6 +375,8 @@ impl<O: IsA<Pad>> PadExtManual for O {
         );
     }
 
+    #[doc(alias = "gst_pad_set_event_full_function")]
+    #[doc(alias = "gst_pad_set_event_full_function_full")]
     unsafe fn set_event_full_function<F>(&self, func: F)
     where
         F: Fn(&Self, Option<&crate::Object>, crate::Event) -> Result<FlowSuccess, FlowError>
@@ -574,6 +393,8 @@ impl<O: IsA<Pad>> PadExtManual for O {
         );
     }
 
+    #[doc(alias = "gst_pad_set_getrange_function")]
+    #[doc(alias = "gst_pad_set_getrange_function_full")]
     unsafe fn set_getrange_function<F>(&self, func: F)
     where
         F: Fn(
@@ -596,6 +417,8 @@ impl<O: IsA<Pad>> PadExtManual for O {
         );
     }
 
+    #[doc(alias = "gst_pad_set_iterate_internal_links_function")]
+    #[doc(alias = "gst_pad_set_iterate_internal_links_function_full")]
     unsafe fn set_iterate_internal_links_function<F>(&self, func: F)
     where
         F: Fn(&Self, Option<&crate::Object>) -> crate::Iterator<Pad> + Send + Sync + 'static,
@@ -609,6 +432,8 @@ impl<O: IsA<Pad>> PadExtManual for O {
         );
     }
 
+    #[doc(alias = "gst_pad_set_link_function")]
+    #[doc(alias = "gst_pad_set_link_function_full")]
     unsafe fn set_link_function<F>(&self, func: F)
     where
         F: Fn(
@@ -629,6 +454,8 @@ impl<O: IsA<Pad>> PadExtManual for O {
         );
     }
 
+    #[doc(alias = "gst_pad_set_query_function")]
+    #[doc(alias = "gst_pad_set_query_function_full")]
     unsafe fn set_query_function<F>(&self, func: F)
     where
         F: Fn(&Self, Option<&crate::Object>, &mut crate::QueryRef) -> bool + Send + Sync + 'static,
@@ -642,6 +469,8 @@ impl<O: IsA<Pad>> PadExtManual for O {
         );
     }
 
+    #[doc(alias = "gst_pad_set_unlink_function")]
+    #[doc(alias = "gst_pad_set_unlink_function_full")]
     unsafe fn set_unlink_function<F>(&self, func: F)
     where
         F: Fn(&Self, Option<&crate::Object>) + Send + Sync + 'static,
@@ -655,6 +484,7 @@ impl<O: IsA<Pad>> PadExtManual for O {
         );
     }
 
+    #[doc(alias = "gst_pad_start_task")]
     fn start_task<F: FnMut() + Send + 'static>(&self, func: F) -> Result<(), glib::BoolError> {
         unsafe extern "C" fn trampoline_pad_task<F: FnMut() + Send + 'static>(func: gpointer) {
             let (func, pad) = &mut *(func as *mut (F, *mut ffi::GstPad));
@@ -700,7 +530,7 @@ impl<O: IsA<Pad>> PadExtManual for O {
             )
         }
     }
-
+    #[doc(alias = "gst_pad_peer_query_convert")]
     fn peer_query_convert<U: SpecificFormattedValueFullRange>(
         &self,
         src_val: impl FormattedValue,
@@ -722,6 +552,7 @@ impl<O: IsA<Pad>> PadExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_pad_peer_query_convert")]
     fn peer_query_convert_generic(
         &self,
         src_val: impl FormattedValue,
@@ -747,6 +578,7 @@ impl<O: IsA<Pad>> PadExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_pad_peer_query_duration")]
     fn peer_query_duration<T: SpecificFormattedValueIntrinsic>(&self) -> Option<T> {
         unsafe {
             let mut duration = mem::MaybeUninit::uninit();
@@ -763,6 +595,7 @@ impl<O: IsA<Pad>> PadExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_pad_peer_query_duration")]
     fn peer_query_duration_generic(&self, format: Format) -> Option<GenericFormattedValue> {
         unsafe {
             let mut duration = mem::MaybeUninit::uninit();
@@ -779,6 +612,7 @@ impl<O: IsA<Pad>> PadExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_pad_peer_query_position")]
     fn peer_query_position<T: SpecificFormattedValueIntrinsic>(&self) -> Option<T> {
         unsafe {
             let mut cur = mem::MaybeUninit::uninit();
@@ -795,6 +629,7 @@ impl<O: IsA<Pad>> PadExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_pad_peer_query_position")]
     fn peer_query_position_generic(&self, format: Format) -> Option<GenericFormattedValue> {
         unsafe {
             let mut cur = mem::MaybeUninit::uninit();
@@ -811,6 +646,7 @@ impl<O: IsA<Pad>> PadExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_pad_query_convert")]
     fn query_convert<U: SpecificFormattedValueFullRange>(
         &self,
         src_val: impl FormattedValue,
@@ -832,6 +668,7 @@ impl<O: IsA<Pad>> PadExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_pad_query_convert")]
     fn query_convert_generic(
         &self,
         src_val: impl FormattedValue,
@@ -857,6 +694,7 @@ impl<O: IsA<Pad>> PadExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_pad_query_duration")]
     fn query_duration<T: SpecificFormattedValueIntrinsic>(&self) -> Option<T> {
         unsafe {
             let mut duration = mem::MaybeUninit::uninit();
@@ -873,6 +711,7 @@ impl<O: IsA<Pad>> PadExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_pad_query_duration")]
     fn query_duration_generic(&self, format: Format) -> Option<GenericFormattedValue> {
         unsafe {
             let mut duration = mem::MaybeUninit::uninit();
@@ -889,6 +728,7 @@ impl<O: IsA<Pad>> PadExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_pad_query_position")]
     fn query_position<T: SpecificFormattedValueIntrinsic>(&self) -> Option<T> {
         unsafe {
             let mut cur = mem::MaybeUninit::uninit();
@@ -905,6 +745,7 @@ impl<O: IsA<Pad>> PadExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_pad_query_position")]
     fn query_position_generic(&self, format: Format) -> Option<GenericFormattedValue> {
         unsafe {
             let mut cur = mem::MaybeUninit::uninit();
@@ -921,6 +762,8 @@ impl<O: IsA<Pad>> PadExtManual for O {
         }
     }
 
+    #[doc(alias = "get_mode")]
+    #[doc(alias = "GST_PAD_MODE")]
     fn mode(&self) -> crate::PadMode {
         unsafe {
             let ptr: &ffi::GstPad = &*(self.as_ptr() as *const _);
@@ -928,6 +771,7 @@ impl<O: IsA<Pad>> PadExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_pad_sticky_events_foreach")]
     fn sticky_events_foreach<
         F: FnMut(&Event) -> ControlFlow<EventForeachAction, EventForeachAction>,
     >(
@@ -978,6 +822,8 @@ impl<O: IsA<Pad>> PadExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_pad_get_sticky_event")]
+    #[doc(alias = "get_sticky_event")]
     fn sticky_event<T: crate::event::StickyEventType>(&self, idx: u32) -> Option<T::Owned> {
         unsafe {
             let ptr = ffi::gst_pad_get_sticky_event(
@@ -1010,6 +856,7 @@ impl<O: IsA<Pad>> PadExtManual for O {
         }
     }
 
+    #[doc(alias = "get_pad_flags")]
     fn pad_flags(&self) -> PadFlags {
         unsafe {
             let ptr: *mut ffi::GstObject = self.as_ptr() as *mut _;
@@ -1019,6 +866,8 @@ impl<O: IsA<Pad>> PadExtManual for O {
     }
 }
 
+impl<O: IsA<Pad>> PadExtManual for O {}
+
 unsafe fn create_probe_info<'a>(
     info: *mut ffi::GstPadProbeInfo,
 ) -> (PadProbeInfo<'a>, Option<glib::Type>) {

gstreamer/src/pipeline.rs

@@ -40,16 +40,12 @@ impl Pipeline {
     }
 }
 
-pub trait GstPipelineExtManual: 'static {
-    fn set_pipeline_flags(&self, flags: PipelineFlags);
-
-    fn unset_pipeline_flags(&self, flags: PipelineFlags);
-
-    #[doc(alias = "get_pipeline_flags")]
-    fn pipeline_flags(&self) -> PipelineFlags;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::Pipeline>> Sealed for T {}
 }
 
-impl<O: IsA<crate::Pipeline>> GstPipelineExtManual for O {
+pub trait GstPipelineExtManual: sealed::Sealed + IsA<Pipeline> + 'static {
     fn set_pipeline_flags(&self, flags: PipelineFlags) {
         unsafe {
             let ptr: *mut ffi::GstObject = self.as_ptr() as *mut _;
@@ -66,6 +62,7 @@ impl<O: IsA<crate::Pipeline>> GstPipelineExtManual for O {
         }
     }
 
+    #[doc(alias = "get_pipeline_flags")]
     fn pipeline_flags(&self) -> PipelineFlags {
         unsafe {
             let ptr: *mut ffi::GstObject = self.as_ptr() as *mut _;
@@ -75,6 +72,8 @@ impl<O: IsA<crate::Pipeline>> GstPipelineExtManual for O {
     }
 }
 
+impl<O: IsA<Pipeline>> GstPipelineExtManual for O {}
+
 impl Default for Pipeline {
     fn default() -> Self {
         glib::object::Object::new()

gstreamer/src/plugin_feature.rs

@@ -7,17 +7,14 @@ use glib::{
 
 use crate::{PluginFeature, Rank};
 
-pub trait PluginFeatureExtManual: Sized + 'static {
-    #[doc(alias = "get_rank")]
-    #[doc(alias = "gst_plugin_feature_get_rank")]
-    fn rank(&self) -> Rank;
-    #[doc(alias = "gst_plugin_feature_set_rank")]
-    fn set_rank(&self, rank: Rank);
-    #[doc(alias = "gst_plugin_feature_load")]
-    fn load(&self) -> Result<Self, glib::BoolError>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::PluginFeature>> Sealed for T {}
 }
 
-impl<O: IsA<PluginFeature>> PluginFeatureExtManual for O {
+pub trait PluginFeatureExtManual: sealed::Sealed + IsA<PluginFeature> + Sized + 'static {
+    #[doc(alias = "get_rank")]
+    #[doc(alias = "gst_plugin_feature_get_rank")]
     fn rank(&self) -> Rank {
         unsafe {
             let rank = ffi::gst_plugin_feature_get_rank(self.as_ref().to_glib_none().0);
@@ -25,6 +22,7 @@ impl<O: IsA<PluginFeature>> PluginFeatureExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_plugin_feature_set_rank")]
     fn set_rank(&self, rank: Rank) {
         unsafe {
             ffi::gst_plugin_feature_set_rank(
@@ -34,6 +32,7 @@ impl<O: IsA<PluginFeature>> PluginFeatureExtManual for O {
         }
     }
 
+    #[doc(alias = "gst_plugin_feature_load")]
     fn load(&self) -> Result<Self, glib::BoolError> {
         unsafe {
             let loaded = Option::<PluginFeature>::from_glib_full(ffi::gst_plugin_feature_load(
@@ -45,6 +44,8 @@ impl<O: IsA<PluginFeature>> PluginFeatureExtManual for O {
     }
 }
 
+impl<O: IsA<PluginFeature>> PluginFeatureExtManual for O {}
+
 #[cfg(test)]
 mod tests {
     use super::*;

gstreamer/src/subclass/allocator.rs

@@ -17,17 +17,12 @@ pub trait AllocatorImpl: AllocatorImplExt + GstObjectImpl + Send + Sync {
     }
 }
 
-pub trait AllocatorImplExt: ObjectSubclass {
-    fn parent_alloc(
-        &self,
-        size: usize,
-        params: Option<&AllocationParams>,
-    ) -> Result<Memory, BoolError>;
-
-    fn parent_free(&self, memory: Memory);
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::AllocatorImplExt> Sealed for T {}
 }
 
-impl<T: AllocatorImpl> AllocatorImplExt for T {
+pub trait AllocatorImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_alloc(
         &self,
         size: usize,
@@ -65,6 +60,8 @@ impl<T: AllocatorImpl> AllocatorImplExt for T {
     }
 }
 
+impl<T: AllocatorImpl> AllocatorImplExt for T {}
+
 unsafe impl<T: AllocatorImpl> IsSubclassable<T> for Allocator {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer/src/subclass/bin.rs

@@ -23,17 +23,12 @@ pub trait BinImpl: BinImplExt + ElementImpl {
     }
 }
 
-pub trait BinImplExt: ObjectSubclass {
-    fn parent_add_element(&self, element: &Element) -> Result<(), LoggableError>;
-
-    fn parent_remove_element(&self, element: &Element) -> Result<(), LoggableError>;
-
-    fn parent_do_latency(&self) -> Result<(), LoggableError>;
-
-    fn parent_handle_message(&self, message: Message);
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::BinImplExt> Sealed for T {}
 }
 
-impl<T: BinImpl> BinImplExt for T {
+pub trait BinImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_add_element(&self, element: &Element) -> Result<(), LoggableError> {
         unsafe {
             let data = Self::type_data();
@@ -108,6 +103,8 @@ impl<T: BinImpl> BinImplExt for T {
     }
 }
 
+impl<T: BinImpl> BinImplExt for T {}
+
 unsafe impl<T: BinImpl> IsSubclassable<T> for Bin {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer/src/subclass/buffer_pool.rs

@@ -64,35 +64,12 @@ pub trait BufferPoolImpl: BufferPoolImplExt + GstObjectImpl + Send + Sync {
     }
 }
 
-pub trait BufferPoolImplExt: ObjectSubclass {
-    fn parent_acquire_buffer(
-        &self,
-        params: Option<&BufferPoolAcquireParams>,
-    ) -> Result<crate::Buffer, crate::FlowError>;
-
-    fn parent_alloc_buffer(
-        &self,
-        params: Option<&BufferPoolAcquireParams>,
-    ) -> Result<crate::Buffer, crate::FlowError>;
-
-    fn parent_free_buffer(&self, buffer: crate::Buffer);
-
-    fn parent_release_buffer(&self, buffer: crate::Buffer);
-
-    fn parent_reset_buffer(&self, buffer: &mut crate::BufferRef);
-
-    fn parent_start(&self) -> bool;
-
-    fn parent_stop(&self) -> bool;
-
-    fn parent_set_config(&self, config: &mut BufferPoolConfigRef) -> bool;
-
-    fn parent_flush_start(&self);
-
-    fn parent_flush_stop(&self);
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::BufferPoolImplExt> Sealed for T {}
 }
 
-impl<T: BufferPoolImpl> BufferPoolImplExt for T {
+pub trait BufferPoolImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_acquire_buffer(
         &self,
         params: Option<&BufferPoolAcquireParams>,
@@ -280,6 +257,8 @@ impl<T: BufferPoolImpl> BufferPoolImplExt for T {
     }
 }
 
+impl<T: BufferPoolImpl> BufferPoolImplExt for T {}
+
 unsafe impl<T: BufferPoolImpl> IsSubclassable<T> for BufferPool {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer/src/subclass/child_proxy.rs

@@ -21,17 +21,12 @@ pub trait ChildProxyImpl: GstObjectImpl + Send + Sync {
     }
 }
 
-pub trait ChildProxyImplExt: ObjectSubclass {
-    fn parent_child_by_name(&self, name: &str) -> Option<glib::Object>;
-
-    fn parent_child_by_index(&self, index: u32) -> Option<glib::Object>;
-    fn parent_children_count(&self) -> u32;
-
-    fn parent_child_added(&self, _child: &glib::Object, _name: &str);
-    fn parent_child_removed(&self, _child: &glib::Object, _name: &str);
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::ChildProxyImplExt> Sealed for T {}
 }
 
-impl<T: ChildProxyImpl> ChildProxyImplExt for T {
+pub trait ChildProxyImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_child_by_name(&self, name: &str) -> Option<glib::Object> {
         unsafe {
             let type_data = Self::type_data();
@@ -112,6 +107,8 @@ impl<T: ChildProxyImpl> ChildProxyImplExt for T {
     }
 }
 
+impl<T: ChildProxyImpl> ChildProxyImplExt for T {}
+
 unsafe impl<T: ChildProxyImpl> IsImplementable<T> for ChildProxy {
     fn interface_init(iface: &mut glib::Interface<Self>) {
         let iface = iface.as_mut();

gstreamer/src/subclass/clock.rs

@@ -31,49 +31,18 @@ pub trait ClockImpl: ClockImplExt + GstObjectImpl + Send + Sync {
     }
 }
 
-pub trait ClockImplExt: ObjectSubclass {
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::ClockImplExt> Sealed for T {}
+}
+
+pub trait ClockImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_change_resolution(
         &self,
         old_resolution: ClockTime,
         new_resolution: ClockTime,
     ) -> ClockTime;
 
-    fn parent_resolution(&self) -> ClockTime;
-
-    fn parent_internal_time(&self) -> ClockTime;
-
-    fn parent_wait(&self, id: &ClockId) -> (Result<ClockSuccess, ClockError>, ClockTimeDiff);
-
-    fn parent_wait_async(&self, id: &ClockId) -> Result<ClockSuccess, ClockError>;
-
-    fn parent_unschedule(&self, id: &ClockId);
-
-    fn wake_id(&self, id: &ClockId);
-}
-
-impl<T: ClockImpl> ClockImplExt for T {
-    fn parent_change_resolution(
-        &self,
-        old_resolution: ClockTime,
-        new_resolution: ClockTime,
-    ) -> ClockTime {
-        unsafe {
-            let data = Self::type_data();
-            let parent_class = data.as_ref().parent_class() as *mut ffi::GstClockClass;
-
-            if let Some(func) = (*parent_class).change_resolution {
-                try_from_glib(func(
-                    self.obj().unsafe_cast_ref::<Clock>().to_glib_none().0,
-                    old_resolution.into_glib(),
-                    new_resolution.into_glib(),
-                ))
-                .expect("undefined resolution")
-            } else {
-                self.resolution()
-            }
-        }
-    }
-
     fn parent_resolution(&self) -> ClockTime {
         unsafe {
             let data = Self::type_data();
@@ -191,6 +160,30 @@ impl<T: ClockImpl> ClockImplExt for T {
     }
 }
 
+impl<T: ClockImpl> ClockImplExt for T {
+    fn parent_change_resolution(
+        &self,
+        old_resolution: ClockTime,
+        new_resolution: ClockTime,
+    ) -> ClockTime {
+        unsafe {
+            let data = Self::type_data();
+            let parent_class = data.as_ref().parent_class() as *mut ffi::GstClockClass;
+
+            if let Some(func) = (*parent_class).change_resolution {
+                try_from_glib(func(
+                    self.obj().unsafe_cast_ref::<Clock>().to_glib_none().0,
+                    old_resolution.into_glib(),
+                    new_resolution.into_glib(),
+                ))
+                .expect("undefined resolution")
+            } else {
+                self.resolution()
+            }
+        }
+    }
+}
+
 unsafe impl<T: ClockImpl> IsSubclassable<T> for Clock {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer/src/subclass/device.rs

@@ -17,13 +17,12 @@ pub trait DeviceImpl: DeviceImplExt + GstObjectImpl + Send + Sync {
     }
 }
 
-pub trait DeviceImplExt: ObjectSubclass {
-    fn parent_create_element(&self, name: Option<&str>) -> Result<Element, LoggableError>;
-
-    fn parent_reconfigure_element(&self, element: &Element) -> Result<(), LoggableError>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::DeviceImplExt> Sealed for T {}
 }
 
-impl<T: DeviceImpl> DeviceImplExt for T {
+pub trait DeviceImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_create_element(&self, name: Option<&str>) -> Result<Element, LoggableError> {
         unsafe {
             let data = Self::type_data();
@@ -72,6 +71,8 @@ impl<T: DeviceImpl> DeviceImplExt for T {
     }
 }
 
+impl<T: DeviceImpl> DeviceImplExt for T {}
+
 unsafe impl<T: DeviceImpl> IsSubclassable<T> for Device {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer/src/subclass/device_provider.rs

@@ -82,15 +82,12 @@ pub trait DeviceProviderImpl: DeviceProviderImplExt + GstObjectImpl + Send + Syn
     }
 }
 
-pub trait DeviceProviderImplExt: ObjectSubclass {
-    fn parent_probe(&self) -> Vec<Device>;
-
-    fn parent_start(&self) -> Result<(), LoggableError>;
-
-    fn parent_stop(&self);
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::DeviceProviderImplExt> Sealed for T {}
 }
 
-impl<T: DeviceProviderImpl> DeviceProviderImplExt for T {
+pub trait DeviceProviderImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_probe(&self) -> Vec<Device> {
         unsafe {
             let data = Self::type_data();
@@ -141,6 +138,8 @@ impl<T: DeviceProviderImpl> DeviceProviderImplExt for T {
     }
 }
 
+impl<T: DeviceProviderImpl> DeviceProviderImplExt for T {}
+
 unsafe impl<T: DeviceProviderImpl> IsSubclassable<T> for DeviceProvider {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer/src/subclass/element.rs

@@ -121,47 +121,12 @@ pub trait ElementImpl: ElementImplExt + GstObjectImpl + Send + Sync {
     }
 }
 
-pub trait ElementImplExt: ObjectSubclass {
-    fn parent_change_state(
-        &self,
-        transition: StateChange,
-    ) -> Result<StateChangeSuccess, StateChangeError>;
-
-    fn parent_request_new_pad(
-        &self,
-        templ: &crate::PadTemplate,
-        name: Option<&str>,
-        caps: Option<&crate::Caps>,
-    ) -> Option<crate::Pad>;
-
-    fn parent_release_pad(&self, pad: &crate::Pad);
-
-    fn parent_send_event(&self, event: Event) -> bool;
-
-    fn parent_query(&self, query: &mut QueryRef) -> bool;
-
-    fn parent_set_context(&self, context: &crate::Context);
-
-    fn parent_set_clock(&self, clock: Option<&crate::Clock>) -> bool;
-
-    fn parent_provide_clock(&self) -> Option<crate::Clock>;
-
-    fn parent_post_message(&self, msg: crate::Message) -> bool;
-
-    fn panicked(&self) -> &atomic::AtomicBool;
-
-    fn catch_panic<R, F: FnOnce(&Self) -> R, G: FnOnce() -> R>(&self, fallback: G, f: F) -> R;
-
-    fn catch_panic_pad_function<R, F: FnOnce(&Self) -> R, G: FnOnce() -> R>(
-        parent: Option<&crate::Object>,
-        fallback: G,
-        f: F,
-    ) -> R;
-
-    fn post_error_message(&self, msg: crate::ErrorMessage);
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::ElementImplExt> Sealed for T {}
 }
 
-impl<T: ElementImpl> ElementImplExt for T {
+pub trait ElementImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_change_state(
         &self,
         transition: StateChange,
@@ -349,6 +314,8 @@ impl<T: ElementImpl> ElementImplExt for T {
     }
 }
 
+impl<T: ElementImpl> ElementImplExt for T {}
+
 unsafe impl<T: ElementImpl> IsSubclassable<T> for Element {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer/src/subclass/pad.rs

@@ -15,13 +15,12 @@ pub trait PadImpl: PadImplExt + GstObjectImpl + Send + Sync {
     }
 }
 
-pub trait PadImplExt: ObjectSubclass {
-    fn parent_linked(&self, peer: &Pad);
-
-    fn parent_unlinked(&self, peer: &Pad);
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::PadImplExt> Sealed for T {}
 }
 
-impl<T: PadImpl> PadImplExt for T {
+pub trait PadImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_linked(&self, peer: &Pad) {
         unsafe {
             let data = Self::type_data();
@@ -57,6 +56,8 @@ impl<T: PadImpl> PadImplExt for T {
     }
 }
 
+impl<T: PadImpl> PadImplExt for T {}
+
 unsafe impl<T: PadImpl> IsSubclassable<T> for Pad {
     fn class_init(klass: &mut glib::Class<Self>) {
         Self::parent_class_init::<T>(klass);

gstreamer/src/subclass/uri_handler.rs

@@ -13,13 +13,12 @@ pub trait URIHandlerImpl: super::element::ElementImpl {
     fn set_uri(&self, uri: &str) -> Result<(), glib::Error>;
 }
 
-pub trait URIHandlerImplExt: ObjectSubclass {
-    fn parent_protocols() -> Vec<String>;
-    fn parent_uri(&self) -> Option<String>;
-    fn parent_set_uri(&self, uri: &str) -> Result<(), glib::Error>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::URIHandlerImplExt> Sealed for T {}
 }
 
-impl<T: URIHandlerImpl> URIHandlerImplExt for T {
+pub trait URIHandlerImplExt: sealed::Sealed + ObjectSubclass {
     fn parent_protocols() -> Vec<String> {
         unsafe {
             let type_data = Self::type_data();
@@ -74,6 +73,8 @@ impl<T: URIHandlerImpl> URIHandlerImplExt for T {
     }
 }
 
+impl<T: URIHandlerImpl> URIHandlerImplExt for T {}
+
 unsafe impl<T: URIHandlerImpl> IsImplementable<T> for URIHandler {
     fn interface_init(iface: &mut glib::Interface<Self>) {
         let iface = iface.as_mut();

gstreamer/src/tag_setter.rs

@@ -4,12 +4,13 @@ use glib::{prelude::*, translate::*};
 
 use crate::{tags::*, TagMergeMode, TagSetter};
 
-pub trait TagSetterExtManual: 'static {
-    #[doc(alias = "gst_tag_setter_add_tag_value")]
-    fn add_tag<'a, T: Tag<'a>>(&self, value: &T::TagType, mode: TagMergeMode);
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::TagSetter>> Sealed for T {}
 }
 
-impl<O: IsA<TagSetter>> TagSetterExtManual for O {
+pub trait TagSetterExtManual: sealed::Sealed + IsA<TagSetter> + 'static {
+    #[doc(alias = "gst_tag_setter_add_tag_value")]
     fn add_tag<'a, T: Tag<'a>>(&self, value: &T::TagType, mode: TagMergeMode) {
         unsafe {
             let v = value.to_send_value();
@@ -23,3 +24,5 @@ impl<O: IsA<TagSetter>> TagSetterExtManual for O {
         }
     }
 }
+
+impl<O: IsA<TagSetter>> TagSetterExtManual for O {}

gstreamer/src/task_pool.rs

@@ -10,16 +10,13 @@ unsafe extern "C" fn task_pool_trampoline<P: FnOnce() + Send + 'static>(data: gp
     let func = Box::from_raw(data as *mut P);
     func()
 }
-
-pub trait TaskPoolExtManual: 'static {
-    #[doc(alias = "gst_task_pool_push")]
-    fn push<P: FnOnce() + Send + 'static>(
-        &self,
-        func: P,
-    ) -> Result<Option<TaskPoolTaskHandle>, glib::Error>;
+mod sealed {
+    pub trait Sealed {}
+    impl<T: super::IsA<super::TaskPool>> Sealed for T {}
 }
 
-impl<O: IsA<TaskPool>> TaskPoolExtManual for O {
+pub trait TaskPoolExtManual: sealed::Sealed + IsA<TaskPool> + 'static {
+    #[doc(alias = "gst_task_pool_push")]
     fn push<P: FnOnce() + Send + 'static>(
         &self,
         func: P,
@@ -56,6 +53,8 @@ impl<O: IsA<TaskPool>> TaskPoolExtManual for O {
     }
 }
 
+impl<O: IsA<TaskPool>> TaskPoolExtManual for O {}
+
 impl TaskPool {
     unsafe fn join(&self, id: ptr::NonNull<libc::c_void>) {
         ffi::gst_task_pool_join(self.to_glib_none().0, id.as_ptr())