feat: Modify gst crate to add lot of more granularity

crates/iced-video/src/source.rs

@@ -0,0 +1,64 @@
+#[derive(Debug, Clone)]
+pub struct VideoSource {
+    playbin: Playbin3,
+    videoconvert: VideoConvert,
+    appsink: AppSink,
+    bus: Bus,
+}
+
+impl VideoSource {
+    /// Creates a new video source from the given URL.
+    /// Since this doesn't have to parse the pipeline manually, we aren't sanitizing the URL for
+    /// now.
+    pub async fn new(url: impl AsRef<str>) -> Result<Self> {
+        Gst::new();
+        let videoconvert = VideoConvert::new("iced-video-convert").change_context(Error)?;
+        let appsink = AppSink::new("iced-video-sink").change_context(Error)?;
+        let video_sink = videoconvert.link(&appsink).change_context(Error)?;
+        let playbin = gst::plugins::playback::Playbin3::new("iced-video")
+            .change_context(Error)?
+            .with_uri(url.as_ref())
+            .with_video_sink(&video_sink);
+        let bus = playbin.bus().change_context(Error)?;
+        playbin.wait_ready()?;
+        // let bus_stream = bus.stream();
+        // bus_stream.find(|message| {
+        //     let view = message.view();
+        //     if let gst::MessageView::StateChanged(change) = view {
+        //         change.current() == gst::State::Ready
+        //     } else {
+        //         false
+        //     }
+        // });
+
+        Ok(Self {
+            playbin,
+            videoconvert,
+            appsink,
+            bus,
+        })
+    }
+
+    pub fn play(&self) -> Result<()> {
+        self.playbin
+            .play()
+            .change_context(Error)
+            .attach("Failed to play video")
+    }
+
+    pub fn pause(&self) -> Result<()> {
+        self.playbin
+            .pause()
+            .change_context(Error)
+            .attach("Failed to pause video")
+    }
+
+    pub fn bus(&self) -> &Bus {}
+    // pub fn copy_frame_to_texture(&self, texture: wgpu::TextureView) -> Result<()> {
+    //     let frame = self
+    //         .appsink
+    //         .try_pull_sample(core::time::Duration::from_millis(1))?
+    //         .ok_or(Error)
+    //         .attach("No video frame available")?;
+    // }
+}