Chrome MediaStream VideoTrack implementation.

content/renderer/media/media_stream_video_track.h

Index: content/renderer/media/media_stream_video_track.h
diff --git a/content/renderer/media/media_stream_video_track.h b/content/renderer/media/media_stream_video_track.h
index 25995906905fdc2d35afa9c7e415191c28e08d21..806053e010cd9dc6de9f0a5089ae84c0062a5d70 100644
--- a/content/renderer/media/media_stream_video_track.h
+++ b/content/renderer/media/media_stream_video_track.h
@@ -5,6 +5,8 @@
 #ifndef CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_TRACK_H_
 #define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_TRACK_H_
 
+#include <vector>
+
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_vector.h"
 #include "base/threading/thread_checker.h"
@@ -19,6 +21,7 @@ class VideoTrackInterface;
 namespace content {
 
 class MediaStreamDependencyFactory;
+class MediaStreamVideoSource;
 class WebRtcVideoSinkAdapter;
 
 // MediaStreamVideoTrack is a video specific representation of a
@@ -27,20 +30,35 @@ class WebRtcVideoSinkAdapter;
 // WebMediaStreamTrack::extraData()
 class CONTENT_EXPORT MediaStreamVideoTrack : public MediaStreamTrack {
  public:
+  static MediaStreamVideoTrack* GetVideoTrack(
+      const blink::WebMediaStreamTrack& track);
+
   // Constructor for local video tracks.
-  explicit MediaStreamVideoTrack(MediaStreamDependencyFactory* factory);
-  // Constructor for remote video tracks.
-  explicit MediaStreamVideoTrack(webrtc::VideoTrackInterface* track);
+  MediaStreamVideoTrack(MediaStreamVideoSource* source,
+                        MediaStreamDependencyFactory* factory);
+
   virtual ~MediaStreamVideoTrack();
-  void AddSink(MediaStreamVideoSink* sink);
-  void RemoveSink(MediaStreamVideoSink* sink);
+  virtual void AddSink(MediaStreamVideoSink* sink);
+  virtual void RemoveSink(MediaStreamVideoSink* sink);
 
   virtual webrtc::VideoTrackInterface* GetVideoAdapter() OVERRIDE;
+  virtual void SetEnabled(bool enabled) OVERRIDE;
 
- private:
+  void OnVideoFrame(const scoped_refptr<media::VideoFrame>& frame);
+  void OnReadyStateChanged(blink::WebMediaStreamSource::ReadyState state);
+
+ protected:
   // Used to DCHECK that we are called on the correct thread.
   base::ThreadChecker thread_checker_;
-  ScopedVector<WebRtcVideoSinkAdapter> sinks_;
+
+ private:
+  bool enabled_;
+  std::vector<MediaStreamVideoSink*> sinks_;
+
+  // Weak ref to the source this tracks is connected to.  |source_| is owned
+  // by the blink::WebMediaStreamSource and is guaranteed to outlive the
+  // track.
+  MediaStreamVideoSource* source_;
 
   // Weak ref to a MediaStreamDependencyFactory, owned by the RenderThread.
   // It's valid for the lifetime of RenderThread.
@@ -49,6 +67,22 @@ class CONTENT_EXPORT MediaStreamVideoTrack : public MediaStreamTrack {
   DISALLOW_COPY_AND_ASSIGN(MediaStreamVideoTrack);
 };
 
+// TODO(perkj): Replace RemoteMediaStreamVideoTrack with a remote video source

[Jói, 2014/02/28 14:52:50]

RemoteVideoStreamTrack -> WebRtcMediaStreamVideoTrack (?)

[perkj_chrome, 2014/03/02 09:20:44]

Done.

+// delegate.
+class CONTENT_EXPORT WebRtcMediaStreamVideoTrack

[Ronghua Wu (Left Chromium), 2014/03/01 01:26:04]

comments for this class.

[perkj_chrome, 2014/03/02 09:20:44]

Done.

+    : public MediaStreamVideoTrack {
+ public:
+  explicit WebRtcMediaStreamVideoTrack(webrtc::VideoTrackInterface* track);
+  virtual ~WebRtcMediaStreamVideoTrack();
+  virtual void AddSink(MediaStreamVideoSink* sink) OVERRIDE;
+  virtual void RemoveSink(MediaStreamVideoSink* sink) OVERRIDE;
+
+ private:
+  ScopedVector<WebRtcVideoSinkAdapter> sinks_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebRtcMediaStreamVideoTrack);
+};
+
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_TRACK_H_