gstreamer_player/subclass/
player_video_renderer.rs

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1// Take a look at the license at the top of the repository in the LICENSE file.
2
3use glib::{prelude::*, subclass::prelude::*, translate::*};
4
5use crate::{ffi, Player, PlayerVideoRenderer};
6
7pub trait PlayerVideoRendererImpl:
8    ObjectImpl + ObjectSubclass<Type: IsA<PlayerVideoRenderer>>
9{
10    fn create_video_sink(&self, player: &Player) -> gst::Element;
11}
12
13unsafe impl<T: PlayerVideoRendererImpl> IsImplementable<T> for PlayerVideoRenderer {
14    fn interface_init(iface: &mut glib::Interface<Self>) {
15        let iface = iface.as_mut();
16
17        iface.create_video_sink = Some(video_renderer_create_video_sink::<T>);
18    }
19}
20
21pub trait PlayerVideoRendererImplExt: PlayerVideoRendererImpl {
22    fn parent_create_video_sink(&self, player: &Player) -> gst::Element {
23        unsafe {
24            let type_data = Self::type_data();
25            let parent_iface = type_data.as_ref().parent_interface::<PlayerVideoRenderer>()
26                as *const ffi::GstPlayerVideoRendererInterface;
27
28            let func = (*parent_iface)
29                .create_video_sink
30                .expect("no parent \"create_video_sink\" implementation");
31            let ret = func(
32                self.obj()
33                    .unsafe_cast_ref::<PlayerVideoRenderer>()
34                    .to_glib_none()
35                    .0,
36                player.to_glib_none().0,
37            );
38            from_glib_none(ret)
39        }
40    }
41}
42
43impl<T: PlayerVideoRendererImpl> PlayerVideoRendererImplExt for T {}
44
45unsafe extern "C" fn video_renderer_create_video_sink<T: PlayerVideoRendererImpl>(
46    video_renderer: *mut ffi::GstPlayerVideoRenderer,
47    player: *mut ffi::GstPlayer,
48) -> *mut gst::ffi::GstElement {
49    static VIDEO_SINK_QUARK: std::sync::OnceLock<glib::Quark> = std::sync::OnceLock::new();
50
51    let video_sink_quark =
52        VIDEO_SINK_QUARK.get_or_init(|| glib::Quark::from_str("gstreamer-rs-player-video-sink"));
53
54    let instance = &*(video_renderer as *mut T::Instance);
55    let imp = instance.imp();
56
57    let sink = imp.create_video_sink(&from_glib_borrow::<_, Player>(player));
58
59    let sink_ptr: *mut gst::ffi::GstElement = sink.to_glib_none().0;
60
61    let old_sink_ptr = glib::gobject_ffi::g_object_get_qdata(
62        video_renderer as *mut _,
63        video_sink_quark.into_glib(),
64    ) as *mut gst::ffi::GstElement;
65    if !old_sink_ptr.is_null() && old_sink_ptr != sink_ptr {
66        panic!("Video sink must not change");
67    }
68
69    unsafe extern "C" fn unref(ptr: glib::ffi::gpointer) {
70        glib::gobject_ffi::g_object_unref(ptr as *mut _);
71    }
72
73    glib::gobject_ffi::g_object_set_qdata_full(
74        video_renderer as *mut _,
75        video_sink_quark.into_glib(),
76        glib::gobject_ffi::g_object_ref(sink_ptr as *mut _) as *mut _,
77        Some(unref),
78    );
79
80    sink_ptr
81}
gstreamer_player/subclass/player_video_renderer.rs

gstreamer_player/subclass/
player_video_renderer.rs
