1// Copyright (c) 2012 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_RTC_VIDEO_RENDERER_H_
6#define CONTENT_RENDERER_MEDIA_RTC_VIDEO_RENDERER_H_
7
8#include "base/callback.h"
9#include "base/memory/weak_ptr.h"
10#include "content/common/content_export.h"
11#include "content/common/media/video_capture.h"
12#include "content/public/renderer/media_stream_video_sink.h"
13#include "content/renderer/media/video_frame_provider.h"
14#include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
15#include "ui/gfx/size.h"
16
17namespace base {
18class MessageLoopProxy;
19}
20
21namespace content {
22
23// RTCVideoRenderer is a VideoFrameProvider designed for rendering
24// Video MediaStreamTracks,
25// http://dev.w3.org/2011/webrtc/editor/getusermedia.html#mediastreamtrack
26// RTCVideoRenderer implements VideoTrackSink in order to render
27// video frames provided from a VideoTrack.
28// RTCVideoRenderer register itself as a sink to the VideoTrack when the
29// VideoFrameProvider is started and deregisters itself when it is stopped.
30// TODO(wuchengli): Add unit test. See the link below for reference.
31// http://src.chromium.org/viewvc/chrome/trunk/src/content/renderer/media/rtc_vi
32// deo_decoder_unittest.cc?revision=180591&view=markup
33class CONTENT_EXPORT RTCVideoRenderer
34    : NON_EXPORTED_BASE(public VideoFrameProvider),
35      NON_EXPORTED_BASE(public MediaStreamVideoSink) {
36 public:
37  RTCVideoRenderer(const blink::WebMediaStreamTrack& video_track,
38                   const base::Closure& error_cb,
39                   const RepaintCB& repaint_cb);
40
41  // VideoFrameProvider implementation. Called on the main thread.
42  virtual void Start() OVERRIDE;
43  virtual void Stop() OVERRIDE;
44  virtual void Play() OVERRIDE;
45  virtual void Pause() OVERRIDE;
46
47 protected:
48  virtual ~RTCVideoRenderer();
49
50 private:
51  enum State {
52    STARTED,
53    PAUSED,
54    STOPPED,
55  };
56
57  void OnVideoFrame(const scoped_refptr<media::VideoFrame>& frame,
58                    const media::VideoCaptureFormat& format,
59                    const base::TimeTicks& estimated_capture_time);
60
61  // VideoTrackSink implementation. Called on the main thread.
62  virtual void OnReadyStateChanged(
63      blink::WebMediaStreamSource::ReadyState state) OVERRIDE;
64
65  void RenderSignalingFrame();
66
67  base::Closure error_cb_;
68  RepaintCB repaint_cb_;
69  scoped_refptr<base::MessageLoopProxy> message_loop_proxy_;
70  State state_;
71  gfx::Size frame_size_;
72  blink::WebMediaStreamTrack video_track_;
73  base::WeakPtrFactory<RTCVideoRenderer> weak_factory_;
74
75  DISALLOW_COPY_AND_ASSIGN(RTCVideoRenderer);
76};
77
78}  // namespace content
79
80#endif  // CONTENT_RENDERER_MEDIA_RTC_VIDEO_RENDERER_H_
81