content/public/renderer/media_stream_video_sink.h

   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/callback.h"
   9 #include "base/compiler_specific.h"
  10 #include "base/memory/ref_counted.h"
  11 #include "base/time/time.h"
  12 #include "content/common/content_export.h"
  13 #include "content/public/renderer/media_stream_sink.h"
  14 #include "media/base/video_capturer_source.h"
  15
  16 namespace blink {
  17 class WebMediaStreamTrack;
  18 }
  19
  20 namespace content {
  21
  22 typedef media::VideoCapturerSource::VideoCaptureDeliverFrameCB
  23     VideoCaptureDeliverFrameCB;
  24
  25 // MediaStreamVideoSink is an interface used for receiving video frames from a
  26 // Video Stream Track or a Video Source.
  27 // http://dev.w3.org/2011/webrtc/editor/getusermedia.html
  28 // All methods calls will be done from the main render thread.
  29 class CONTENT_EXPORT MediaStreamVideoSink : public MediaStreamSink {
  30  public:
  31   // An implementation of MediaStreamVideoSink should call AddToVideoTrack when
  32   // it is ready to receive data from a video track. Before the implementation
  33   // is destroyed, RemoveFromVideoTrack must be called.
  34   //
  35   // Calls to these methods must be done on the main render thread.
  36   // Note that |callback| for frame delivery happens on the IO thread.
  37   //
  38   // Calling RemoveFromVideoTrack also not stop frame delivery through the
  39   // callback immediately because it may happen on another thread.
  40   // The added callback will be reset on the render thread.
  41   static void AddToVideoTrack(MediaStreamVideoSink* sink,
  42                               const VideoCaptureDeliverFrameCB& callback,
  43                               const blink::WebMediaStreamTrack& track);
  44   static void RemoveFromVideoTrack(MediaStreamVideoSink* sink,
  45                                    const blink::WebMediaStreamTrack& track);
  46
  47  protected:
  48   ~MediaStreamVideoSink() override {}
  49 };
  50
  51
  52 }  // namespace content
  53
  54 #endif  // CONTENT_PUBLIC_RENDERER_MEDIA_STREAM_VIDEO_SINK_H_