1// Take a look at the license at the top of the repository in the LICENSE file.
2
3use glib::{prelude::*, translate::*};
4use gst_base::subclass::prelude::*;
5
6use crate::{ffi, VideoSink};
7
8pub trait VideoSinkImpl: VideoSinkImplExt + BaseSinkImpl + ElementImpl {
9 fn show_frame(&self, buffer: &gst::Buffer) -> Result<gst::FlowSuccess, gst::FlowError> {
10 self.parent_show_frame(buffer)
11 }
12}
13
14mod sealed {
15 pub trait Sealed {}
16 impl<T: super::VideoSinkImplExt> Sealed for T {}
17}
18
19pub trait VideoSinkImplExt: sealed::Sealed + ObjectSubclass {
20 fn parent_show_frame(&self, buffer: &gst::Buffer) -> Result<gst::FlowSuccess, gst::FlowError> {
21 unsafe {
22 let data: NonNull = Self::type_data();
23 let parent_class: *mut GstVideoSinkClass = data.as_ref().parent_class() as *mut ffi::GstVideoSinkClass;
24 (*parent_class)
25 .show_frame
26 .map(|f| {
27 try_from_glib(f(
28 self.obj().unsafe_cast_ref::<VideoSink>().to_glib_none().0,
29 buffer.to_glib_none().0,
30 ))
31 })
32 .unwrap_or(default:Err(gst::FlowError::Error))
33 }
34 }
35}
36
37impl<T: VideoSinkImpl> VideoSinkImplExt for T {}
38
39unsafe impl<T: VideoSinkImpl> IsSubclassable<T> for VideoSink {
40 fn class_init(klass: &mut glib::Class<Self>) {
41 Self::parent_class_init::<T>(class:klass);
42 let klass: &mut GstVideoSinkClass = klass.as_mut();
43 klass.show_frame = Some(video_sink_show_frame::<T>);
44 }
45}
46
47unsafe extern "C" fn video_sink_show_frame<T: VideoSinkImpl>(
48 ptr: *mut ffi::GstVideoSink,
49 buffer: *mut gst::ffi::GstBuffer,
50) -> gst::ffi::GstFlowReturn {
51 let instance: &::Instance = &*(ptr as *mut T::Instance);
52 let imp: &T = instance.imp();
53 let buffer: Borrowed = from_glib_borrow(ptr:buffer);
54
55 gstFlowReturn::panic_to_error!(imp, gst::FlowReturn::Error, {
56 imp.show_frame(&buffer).into()
57 })
58 .into_glib()
59}
60