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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CONTENT_RENDERER_MEDIA_RTC_VIDEO_RENDERER_H_
      6 #define CONTENT_RENDERER_MEDIA_RTC_VIDEO_RENDERER_H_
      7 
      8 #include "base/callback.h"
      9 #include "base/memory/weak_ptr.h"
     10 #include "content/common/content_export.h"
     11 #include "content/common/media/video_capture.h"
     12 #include "content/public/renderer/media_stream_video_sink.h"
     13 #include "content/renderer/media/video_frame_provider.h"
     14 #include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
     15 #include "ui/gfx/size.h"
     16 
     17 namespace base {
     18 class MessageLoopProxy;
     19 }
     20 
     21 namespace content {
     22 
     23 // RTCVideoRenderer is a VideoFrameProvider designed for rendering
     24 // Video MediaStreamTracks,
     25 // http://dev.w3.org/2011/webrtc/editor/getusermedia.html#mediastreamtrack
     26 // RTCVideoRenderer implements VideoTrackSink in order to render
     27 // video frames provided from a VideoTrack.
     28 // RTCVideoRenderer register itself as a sink to the VideoTrack when the
     29 // VideoFrameProvider is started and deregisters itself when it is stopped.
     30 // TODO(wuchengli): Add unit test. See the link below for reference.
     31 // http://src.chromium.org/viewvc/chrome/trunk/src/content/renderer/media/rtc_vi
     32 // deo_decoder_unittest.cc?revision=180591&view=markup
     33 class CONTENT_EXPORT RTCVideoRenderer
     34     : NON_EXPORTED_BASE(public VideoFrameProvider),
     35       NON_EXPORTED_BASE(public MediaStreamVideoSink) {
     36  public:
     37   RTCVideoRenderer(const blink::WebMediaStreamTrack& video_track,
     38                    const base::Closure& error_cb,
     39                    const RepaintCB& repaint_cb);
     40 
     41   // VideoFrameProvider implementation. Called on the main thread.
     42   virtual void Start() OVERRIDE;
     43   virtual void Stop() OVERRIDE;
     44   virtual void Play() OVERRIDE;
     45   virtual void Pause() OVERRIDE;
     46 
     47  protected:
     48   virtual ~RTCVideoRenderer();
     49 
     50  private:
     51   enum State {
     52     STARTED,
     53     PAUSED,
     54     STOPPED,
     55   };
     56 
     57   void OnVideoFrame(const scoped_refptr<media::VideoFrame>& frame,
     58                     const media::VideoCaptureFormat& format,
     59                     const base::TimeTicks& estimated_capture_time);
     60 
     61   // VideoTrackSink implementation. Called on the main thread.
     62   virtual void OnReadyStateChanged(
     63       blink::WebMediaStreamSource::ReadyState state) OVERRIDE;
     64 
     65   void RenderSignalingFrame();
     66 
     67   base::Closure error_cb_;
     68   RepaintCB repaint_cb_;
     69   scoped_refptr<base::MessageLoopProxy> message_loop_proxy_;
     70   State state_;
     71   gfx::Size frame_size_;
     72   blink::WebMediaStreamTrack video_track_;
     73   base::WeakPtrFactory<RTCVideoRenderer> weak_factory_;
     74 
     75   DISALLOW_COPY_AND_ASSIGN(RTCVideoRenderer);
     76 };
     77 
     78 }  // namespace content
     79 
     80 #endif  // CONTENT_RENDERER_MEDIA_RTC_VIDEO_RENDERER_H_
     81