content/renderer/media/rtc_video_renderer.h

   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_