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      1 // Copyright 2013 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_PUBLIC_RENDERER_MEDIA_STREAM_VIDEO_SINK_H_
      6 #define CONTENT_PUBLIC_RENDERER_MEDIA_STREAM_VIDEO_SINK_H_
      7 
      8 #include "base/compiler_specific.h"
      9 #include "base/memory/ref_counted.h"
     10 #include "content/common/content_export.h"
     11 #include "content/public/renderer/media_stream_sink.h"
     12 
     13 namespace media {
     14 class VideoFrame;
     15 }
     16 
     17 namespace blink {
     18 class WebMediaStreamTrack;
     19 }
     20 
     21 namespace content {
     22 
     23 // MediaStreamVideoSink is an interface used for receiving video frames from a
     24 // Video Stream Track or a Video Source.
     25 // http://dev.w3.org/2011/webrtc/editor/getusermedia.html
     26 // All methods calls will be done from the main render thread.
     27 class CONTENT_EXPORT MediaStreamVideoSink : public MediaStreamSink {
     28  public:
     29   // An implementation of MediaStreamVideoSink should call AddToVideoTrack when
     30   // it is ready to receive data from a video track. Before the implementation
     31   // is destroyed, RemoveFromVideoTrack must be called.
     32   // Calls to these methods must be done on the main render thread.
     33   static void AddToVideoTrack(MediaStreamVideoSink* sink,
     34                               const blink::WebMediaStreamTrack& track);
     35   static void RemoveFromVideoTrack(MediaStreamVideoSink* sink,
     36                                    const blink::WebMediaStreamTrack& track);
     37 
     38   virtual void OnVideoFrame(const scoped_refptr<media::VideoFrame>& frame) = 0;
     39 
     40  protected:
     41   virtual ~MediaStreamVideoSink() {}
     42 };
     43 
     44 
     45 }  // namespace content
     46 
     47 #endif  // CONTENT_PUBLIC_RENDERER_MEDIA_STREAM_VIDEO_SINK_H_
     48