audio: Add bindings for GstAudioFilter

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1165>

gstreamer-audio/Gir.toml

@@ -23,6 +23,7 @@ generate = [
     "GstAudio.AudioBaseSrc",
     "GstAudio.AudioChannelPosition",
     "GstAudio.AudioDitherMethod",
+    "GstAudio.AudioFilter",
     "GstAudio.AudioFormatFlags",
     "GstAudio.AudioLayout",
     "GstAudio.AudioNoiseShapingMethod",
@@ -53,6 +54,7 @@ manual = [
     "GstBase.AggregatorPad",
     "GstBase.BaseSink",
     "GstBase.BaseSrc",
+    "GstBase.BaseTransform",
 ]
 
 [[object]]

gstreamer-audio/src/audio_info.rs

@@ -409,6 +409,17 @@ impl<'a> glib::translate::ToGlibPtr<'a, *const ffi::GstAudioInfo> for AudioInfo
     }
 }
 
+#[doc(hidden)]
+impl glib::translate::FromGlibPtrNone<*const ffi::GstAudioInfo> for AudioInfo {
+    #[inline]
+    unsafe fn from_glib_none(ptr: *const ffi::GstAudioInfo) -> Self {
+        Self(
+            ptr::read(ptr),
+            std::array::from_fn(|i| from_glib((*ptr).position[i])),
+        )
+    }
+}
+
 #[doc(hidden)]
 impl glib::translate::FromGlibPtrNone<*mut ffi::GstAudioInfo> for AudioInfo {
     #[inline]

gstreamer-audio/src/auto/audio_filter.rs

@@ -0,0 +1,20 @@
+// This file was generated by gir (https://github.com/gtk-rs/gir)
+// from gir-files (https://github.com/gtk-rs/gir-files)
+// from gst-gir-files (https://gitlab.freedesktop.org/gstreamer/gir-files-rs.git)
+// DO NOT EDIT
+
+glib::wrapper! {
+    #[doc(alias = "GstAudioFilter")]
+    pub struct AudioFilter(Object<ffi::GstAudioFilter, ffi::GstAudioFilterClass>) @extends gst_base::BaseTransform, gst::Element, gst::Object;
+
+    match fn {
+        type_ => || ffi::gst_audio_filter_get_type(),
+    }
+}
+
+impl AudioFilter {
+    pub const NONE: Option<&'static AudioFilter> = None;
+}
+
+unsafe impl Send for AudioFilter {}
+unsafe impl Sync for AudioFilter {}

gstreamer-audio/src/auto/mod.rs

@@ -24,6 +24,9 @@ pub use self::audio_decoder::AudioDecoder;
 mod audio_encoder;
 pub use self::audio_encoder::AudioEncoder;
 
+mod audio_filter;
+pub use self::audio_filter::AudioFilter;
+
 mod audio_sink;
 pub use self::audio_sink::AudioSink;
 

gstreamer-audio/src/subclass/audio_filter.rs

@@ -0,0 +1,78 @@
+// Take a look at the license at the top of the repository in the LICENSE file.
+
+use glib::translate::*;
+
+use gst_base::prelude::*;
+use gst_base::subclass::prelude::*;
+
+use crate::AudioFilter;
+use crate::AudioInfo;
+
+pub trait AudioFilterImpl: AudioFilterImplExt + BaseTransformImpl {
+    fn allowed_caps() -> &'static gst::Caps;
+
+    fn setup(&self, info: &AudioInfo) -> Result<(), gst::LoggableError> {
+        self.parent_setup(info)
+    }
+}
+
+pub trait AudioFilterImplExt: ObjectSubclass {
+    fn parent_setup(&self, info: &AudioInfo) -> Result<(), gst::LoggableError>;
+}
+
+impl<T: AudioFilterImpl> AudioFilterImplExt for T {
+    fn parent_setup(&self, info: &AudioInfo) -> Result<(), gst::LoggableError> {
+        unsafe {
+            let data = Self::type_data();
+            let parent_class = data.as_ref().parent_class() as *mut ffi::GstAudioFilterClass;
+            (*parent_class)
+                .setup
+                .map(|f| {
+                    gst::result_from_gboolean!(
+                        f(
+                            self.obj().unsafe_cast_ref::<AudioFilter>().to_glib_none().0,
+                            info.to_glib_none().0,
+                        ),
+                        gst::CAT_RUST,
+                        "Parent function `setup` failed"
+                    )
+                })
+                .unwrap_or(Ok(()))
+        }
+    }
+}
+
+unsafe impl<T: AudioFilterImpl> IsSubclassable<T> for AudioFilter {
+    fn class_init(klass: &mut glib::Class<Self>) {
+        Self::parent_class_init::<T>(klass);
+
+        let klass = klass.as_mut();
+        klass.setup = Some(audio_filter_setup::<T>);
+
+        unsafe {
+            ffi::gst_audio_filter_class_add_pad_templates(
+                &mut *klass,
+                T::allowed_caps().to_glib_none().0,
+            );
+        }
+    }
+}
+
+unsafe extern "C" fn audio_filter_setup<T: AudioFilterImpl>(
+    ptr: *mut ffi::GstAudioFilter,
+    info: *const ffi::GstAudioInfo,
+) -> glib::ffi::gboolean {
+    let instance = &*(ptr as *mut T::Instance);
+    let imp = instance.imp();
+
+    gst::panic_to_error!(imp, false, {
+        match imp.setup(&from_glib_none(info)) {
+            Ok(()) => true,
+            Err(err) => {
+                err.log_with_imp(imp);
+                false
+            }
+        }
+    })
+    .into_glib()
+}

gstreamer-audio/src/subclass/mod.rs

@@ -9,6 +9,7 @@ mod audio_base_sink;
 mod audio_base_src;
 mod audio_decoder;
 mod audio_encoder;
+mod audio_filter;
 mod audio_sink;
 mod audio_src;
 
@@ -23,6 +24,7 @@ pub mod prelude {
     pub use super::audio_base_src::AudioBaseSrcImpl;
     pub use super::audio_decoder::{AudioDecoderImpl, AudioDecoderImplExt};
     pub use super::audio_encoder::{AudioEncoderImpl, AudioEncoderImplExt};
+    pub use super::audio_filter::{AudioFilterImpl, AudioFilterImplExt};
     pub use super::audio_sink::{AudioSinkImpl, AudioSinkImplExt};
     pub use super::audio_src::{AudioSrcImpl, AudioSrcImplExt};
 }