content/renderer/media/webrtc/webrtc_video_sink_adapter.h

// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_RENDERER_MEDIA_WEBRTC_WEBRTC_VIDEO_SINK_ADAPTER_H_
#define CONTENT_RENDERER_MEDIA_WEBRTC_WEBRTC_VIDEO_SINK_ADAPTER_H_

#include "base/memory/weak_ptr.h"
#include "content/common/content_export.h"
#include "content/public/renderer/media_stream_video_sink.h"
#include "third_party/libjingle/source/talk/app/webrtc/mediastreaminterface.h"

namespace base {
class MessageLoopProxy;
}

namespace content {

// WebRtcVideoSinkAdapter acts as the middle man between a
// webrtc:::VideoTrackInterface and a content::MediaStreamVideoSink.
// It is responsible for translating video data from a libjingle video type
// to a chrome video type.
class CONTENT_EXPORT WebRtcVideoSinkAdapter
    : NON_EXPORTED_BASE(public webrtc::VideoRendererInterface),
      NON_EXPORTED_BASE(public webrtc::ObserverInterface),
      public base::SupportsWeakPtr<WebRtcVideoSinkAdapter> {
 public:
  WebRtcVideoSinkAdapter(webrtc::VideoTrackInterface* video_track,
                         MediaStreamVideoSink* sink);
  virtual ~WebRtcVideoSinkAdapter();

  MediaStreamVideoSink* sink() const { return sink_; }

 protected:
  // webrtc::VideoRendererInterface implementation. May be called on
  // a different thread.
  virtual void SetSize(int width, int height) OVERRIDE;
  virtual void RenderFrame(const cricket::VideoFrame* frame) OVERRIDE;

  // webrtc::ObserverInterface implementation.
  // TODO(perkj): OnChanged should be implemented on a common base class used
  // for both WebRtc Audio and Video tracks.
  virtual void OnChanged() OVERRIDE;

 private:
  void DoRenderFrameOnMainThread(scoped_refptr<media::VideoFrame> video_frame);

  scoped_refptr<base::MessageLoopProxy> message_loop_proxy_;
  MediaStreamVideoSink* sink_;
  // The video track the renderer is connected to.
  scoped_refptr<webrtc::VideoTrackInterface> video_track_;
  webrtc::MediaStreamTrackInterface::TrackState state_;

  DISALLOW_COPY_AND_ASSIGN(WebRtcVideoSinkAdapter);
};

}  // namespace content

#endif  // CONTENT_RENDERER_MEDIA_WEBRTC_WEBRTC_VIDEO_SINK_ADAPTER_H_