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// Copyright (c) 2012 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_RTC_VIDEO_DECODER_H_
#define CONTENT_RENDERER_MEDIA_RTC_VIDEO_DECODER_H_
#include <string>
#include "base/compiler_specific.h"
#include "base/gtest_prod_util.h"
#include "base/synchronization/lock.h"
#include "base/task_runner.h"
#include "base/time.h"
#include "content/common/content_export.h"
#include "media/base/video_decoder.h"
#include "third_party/libjingle/source/talk/app/webrtc/mediastreaminterface.h"
namespace cricket {
class VideoFrame;
} // namespace cricket
// RTCVideoDecoder is a media::VideoDecoder designed for rendering
// Video MediaStreamTracks,
// http://dev.w3.org/2011/webrtc/editor/getusermedia.html#mediastreamtrack
// RTCVideoDecoder implements webrtc::VideoRendererInterface in order to render
// video frames provided from a webrtc::VideoTrackInteface.
// RTCVideoDecoder register itself to the Video Track when the decoder is
// initialized and deregisters itself when it is stopped.
// Calls to webrtc::VideoTrackInterface must occur on the main render thread.
class CONTENT_EXPORT RTCVideoDecoder
: public media::VideoDecoder,
NON_EXPORTED_BASE(public webrtc::VideoRendererInterface) {
public:
RTCVideoDecoder(base::TaskRunner* video_decoder_thread, // For video decoder
base::TaskRunner* main_thread, // For accessing VideoTracks.
webrtc::VideoTrackInterface* video_track);
// media::VideoDecoder implementation.
virtual void Initialize(const scoped_refptr<media::DemuxerStream>& stream,
const media::PipelineStatusCB& status_cb,
const media::StatisticsCB& statistics_cb) OVERRIDE;
virtual void Read(const ReadCB& read_cb) OVERRIDE;
virtual void Reset(const base::Closure& clusure) OVERRIDE;
virtual void Stop(const base::Closure& clusure) OVERRIDE;
virtual const gfx::Size& natural_size() OVERRIDE;
virtual void PrepareForShutdownHack() OVERRIDE;
// webrtc::VideoRendererInterface implementation
virtual void SetSize(int width, int height) OVERRIDE;
virtual void RenderFrame(const cricket::VideoFrame* frame) OVERRIDE;
protected:
virtual ~RTCVideoDecoder();
private:
friend class RTCVideoDecoderTest;
FRIEND_TEST_ALL_PREFIXES(RTCVideoDecoderTest, Initialize_Successful);
FRIEND_TEST_ALL_PREFIXES(RTCVideoDecoderTest, DoReset);
FRIEND_TEST_ALL_PREFIXES(RTCVideoDecoderTest, DoRenderFrame);
FRIEND_TEST_ALL_PREFIXES(RTCVideoDecoderTest, DoSetSize);
FRIEND_TEST_ALL_PREFIXES(RTCVideoDecoderTest, ReadAndShutdown);
enum DecoderState {
kUnInitialized,
kNormal,
kStopped
};
void CancelPendingRead();
// Register this RTCVideoDecoder to get VideoFrames from the
// webrtc::VideoTrack in |video_track_|.
// This is done on the |main_thread_|.
void RegisterToVideoTrack();
void DeregisterFromVideoTrack();
scoped_refptr<base::TaskRunner> video_decoder_thread_;
scoped_refptr<base::TaskRunner> main_thread_;
gfx::Size visible_size_;
std::string url_;
DecoderState state_;
ReadCB read_cb_;
bool got_first_frame_;
bool shutting_down_;
base::TimeDelta last_frame_timestamp_;
base::TimeDelta start_time_;
// The video track the renderer is connected to.
scoped_refptr<webrtc::VideoTrackInterface> video_track_;
// Used for accessing |read_cb_| from another thread.
base::Lock lock_;
DISALLOW_COPY_AND_ASSIGN(RTCVideoDecoder);
};
#endif // CONTENT_RENDERER_MEDIA_RTC_VIDEO_DECODER_H_