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      1 // Copyright 2014 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_WEBRTC_MEDIA_STREAM_REMOTE_VIDEO_SOURCE_H_
      6 #define CONTENT_RENDERER_MEDIA_WEBRTC_MEDIA_STREAM_REMOTE_VIDEO_SOURCE_H_
      7 
      8 #include "base/threading/thread_checker.h"
      9 #include "content/common/content_export.h"
     10 #include "content/renderer/media/media_stream_video_source.h"
     11 #include "third_party/WebKit/public/platform/WebMediaStreamSource.h"
     12 #include "third_party/libjingle/source/talk/app/webrtc/mediastreaminterface.h"
     13 
     14 namespace content {
     15 
     16 // MediaStreamRemoteVideoSource implements the MediaStreamVideoSource interface
     17 // for video tracks received on a PeerConnection. The purpose of the class is
     18 // to make sure there is no difference between a video track where the source is
     19 // a local source and a video track where the source is a remote video track.
     20 class CONTENT_EXPORT MediaStreamRemoteVideoSource
     21      : public MediaStreamVideoSource,
     22        NON_EXPORTED_BASE(public webrtc::ObserverInterface) {
     23  public:
     24   explicit MediaStreamRemoteVideoSource(
     25       webrtc::VideoTrackInterface* remote_track);
     26   virtual ~MediaStreamRemoteVideoSource();
     27 
     28  protected:
     29   // Implements MediaStreamVideoSource.
     30   virtual void GetCurrentSupportedFormats(
     31       int max_requested_width,
     32       int max_requested_height,
     33       double max_requested_frame_rate,
     34       const VideoCaptureDeviceFormatsCB& callback) OVERRIDE;
     35 
     36   virtual void StartSourceImpl(
     37       const media::VideoCaptureFormat& format,
     38       const VideoCaptureDeliverFrameCB& frame_callback) OVERRIDE;
     39 
     40   virtual void StopSourceImpl() OVERRIDE;
     41 
     42   // Used by tests to test that a frame can be received and that the
     43   // MediaStreamRemoteVideoSource behaves as expected.
     44   webrtc::VideoRendererInterface* RenderInterfaceForTest();
     45 
     46  private:
     47   // webrtc::ObserverInterface implementation.
     48   virtual void OnChanged() OVERRIDE;
     49 
     50   scoped_refptr<webrtc::VideoTrackInterface> remote_track_;
     51   webrtc::MediaStreamTrackInterface::TrackState last_state_;
     52 
     53   // Internal class used for receiving frames from the webrtc track on a
     54   // libjingle thread and forward it to the IO-thread.
     55   class RemoteVideoSourceDelegate;
     56   scoped_refptr<RemoteVideoSourceDelegate> delegate_;
     57 
     58   // Bound to the render thread.
     59   base::ThreadChecker thread_checker_;
     60 
     61   DISALLOW_COPY_AND_ASSIGN(MediaStreamRemoteVideoSource);
     62 };
     63 
     64 }  // namespace content
     65 
     66 #endif  // CONTENT_RENDERER_MEDIA_WEBRTC_MEDIA_STREAM_REMOTE_VIDEO_SOURCE_H_
     67