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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_WEBRTC_VIDEO_TRACK_ADAPTER_H_
      6 #define CONTENT_RENDERER_MEDIA_WEBRTC_WEBRTC_VIDEO_TRACK_ADAPTER_H_
      7 
      8 #include "base/macros.h"
      9 #include "base/threading/thread_checker.h"
     10 #include "content/public/renderer/media_stream_video_sink.h"
     11 #include "content/renderer/media/webrtc/peer_connection_dependency_factory.h"
     12 #include "content/renderer/media/webrtc/webrtc_video_capturer_adapter.h"
     13 #include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
     14 #include "third_party/libjingle/source/talk/app/webrtc/mediastreaminterface.h"
     15 #include "third_party/libjingle/source/talk/app/webrtc/videosourceinterface.h"
     16 
     17 namespace content {
     18 
     19 class MediaStreamVideoTrack;
     20 
     21 // WebRtcVideoTrackAdapter is an adapter between a
     22 // content::MediaStreamVideoTrack object and a webrtc VideoTrack that is
     23 // currently sent on a PeerConnection.
     24 // The responsibility of the class is to create and own a representation of a
     25 // webrtc VideoTrack that can be added and removed from a RTCPeerConnection.
     26 // An instance of WebRtcVideoTrackAdapter is created when a VideoTrack is
     27 // added to an RTCPeerConnection object.
     28 // Instances of this class is owned by the WebRtcMediaStreamAdapter object that
     29 // created it.
     30 class WebRtcVideoTrackAdapter : public MediaStreamVideoSink {
     31  public:
     32   WebRtcVideoTrackAdapter(const blink::WebMediaStreamTrack& track,
     33                           PeerConnectionDependencyFactory* factory);
     34   virtual ~WebRtcVideoTrackAdapter();
     35 
     36   webrtc::VideoTrackInterface* webrtc_video_track() {
     37     return video_track_.get();
     38   }
     39 
     40  protected:
     41   // Implementation of MediaStreamSink.
     42   virtual void OnEnabledChanged(bool enabled) OVERRIDE;
     43 
     44  private:
     45   // Used to DCHECK that we are called on the correct thread.
     46   base::ThreadChecker thread_checker_;
     47 
     48   scoped_refptr<webrtc::VideoTrackInterface> video_track_;
     49   blink::WebMediaStreamTrack web_track_;
     50 
     51   class WebRtcVideoSourceAdapter;
     52   scoped_refptr<WebRtcVideoSourceAdapter> source_adapter_;
     53 
     54   DISALLOW_COPY_AND_ASSIGN(WebRtcVideoTrackAdapter);
     55 };
     56 
     57 }  // namespace content
     58 
     59 #endif  // CONTENT_RENDERER_MEDIA_WEBRTC_WEBRTC_VIDEO_TRACK_ADAPTER_H_
     60