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: ObjectImpl {
8    fn create_video_sink(&self, player: &Player) -> gst::Element;
9}
10
11unsafe impl<T: PlayerVideoRendererImpl> IsImplementable<T> for PlayerVideoRenderer {
12    fn interface_init(iface: &mut glib::Interface<Self>) {
13        let iface = iface.as_mut();
14
15        iface.create_video_sink = Some(video_renderer_create_video_sink::<T>);
16    }
17}
18
19mod sealed {
20    pub trait Sealed {}
21    impl<T: super::PlayerVideoRendererImplExt> Sealed for T {}
22}
23
24pub trait PlayerVideoRendererImplExt: sealed::Sealed + ObjectSubclass {
25    fn parent_create_video_sink(&self, player: &Player) -> gst::Element {
26        unsafe {
27            let type_data = Self::type_data();
28            let parent_iface = type_data.as_ref().parent_interface::<PlayerVideoRenderer>()
29                as *const ffi::GstPlayerVideoRendererInterface;
30
31            let func = (*parent_iface)
32                .create_video_sink
33                .expect("no parent \"create_video_sink\" implementation");
34            let ret = func(
35                self.obj()
36                    .unsafe_cast_ref::<PlayerVideoRenderer>()
37                    .to_glib_none()
38                    .0,
39                player.to_glib_none().0,
40            );
41            from_glib_none(ret)
42        }
43    }
44}
45
46impl<T: PlayerVideoRendererImpl> PlayerVideoRendererImplExt for T {}
47
48unsafe extern "C" fn video_renderer_create_video_sink<T: PlayerVideoRendererImpl>(
49    video_renderer: *mut ffi::GstPlayerVideoRenderer,
50    player: *mut ffi::GstPlayer,
51) -> *mut gst::ffi::GstElement {
52    static VIDEO_SINK_QUARK: std::sync::OnceLock<glib::Quark> = std::sync::OnceLock::new();
53
54    let video_sink_quark =
55        VIDEO_SINK_QUARK.get_or_init(|| glib::Quark::from_str("gstreamer-rs-player-video-sink"));
56
57    let instance = &*(video_renderer as *mut T::Instance);
58    let imp = instance.imp();
59
60    let sink = imp.create_video_sink(&from_glib_borrow::<_, Player>(player));
61
62    let sink_ptr: *mut gst::ffi::GstElement = sink.to_glib_none().0;
63
64    let old_sink_ptr = glib::gobject_ffi::g_object_get_qdata(
65        video_renderer as *mut _,
66        video_sink_quark.into_glib(),
67    ) as *mut gst::ffi::GstElement;
68    if !old_sink_ptr.is_null() && old_sink_ptr != sink_ptr {
69        panic!("Video sink must not change");
70    }
71
72    unsafe extern "C" fn unref(ptr: glib::ffi::gpointer) {
73        glib::gobject_ffi::g_object_unref(ptr as *mut _);
74    }
75
76    glib::gobject_ffi::g_object_set_qdata_full(
77        video_renderer as *mut _,
78        video_sink_quark.into_glib(),
79        glib::gobject_ffi::g_object_ref(sink_ptr as *mut _) as *mut _,
80        Some(unref),
81    );
82
83    sink_ptr
84}
gstreamer_player/subclass/player_video_renderer.rs

gstreamer_player/subclass/
player_video_renderer.rs
