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// 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_MEDIA_STREAM_VIDEO_TRACK_H_
#define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_TRACK_H_
#include <vector>
#include "base/compiler_specific.h"
#include "base/gtest_prod_util.h"
#include "base/memory/scoped_vector.h"
#include "base/threading/thread_checker.h"
#include "content/common/content_export.h"
#include "content/public/renderer/media_stream_video_sink.h"
#include "content/renderer/media/media_stream_track.h"
#include "content/renderer/media/media_stream_video_source.h"
namespace content {
// MediaStreamVideoTrack is a video specific representation of a
// blink::WebMediaStreamTrack in content. It is owned by the blink object
// and can be retrieved from a blink object using
// WebMediaStreamTrack::extraData() or MediaStreamVideoTrack::GetVideoTrack.
class CONTENT_EXPORT MediaStreamVideoTrack : public MediaStreamTrack {
public:
// Help method to create a blink::WebMediaStreamTrack and a
// MediaStreamVideoTrack instance. The MediaStreamVideoTrack object is owned
// by the blink object in its WebMediaStreamTrack::ExtraData member.
// |callback| is triggered if the track is added to the source
// successfully and will receive video frames that match |constraints|
// or if the source fail to provide video frames.
// If |enabled| is true, sinks added to the track will
// receive video frames when the source deliver frames to the track.
static blink::WebMediaStreamTrack CreateVideoTrack(
MediaStreamVideoSource* source,
const blink::WebMediaConstraints& constraints,
const MediaStreamVideoSource::ConstraintsCallback& callback,
bool enabled);
static MediaStreamVideoTrack* GetVideoTrack(
const blink::WebMediaStreamTrack& track);
// Constructor for local video tracks.
MediaStreamVideoTrack(
MediaStreamVideoSource* source,
const blink::WebMediaConstraints& constraints,
const MediaStreamVideoSource::ConstraintsCallback& callback,
bool enabled);
virtual ~MediaStreamVideoTrack();
virtual void SetEnabled(bool enabled) OVERRIDE;
virtual void Stop() OVERRIDE;
void OnReadyStateChanged(blink::WebMediaStreamSource::ReadyState state);
const blink::WebMediaConstraints& constraints() const {
return constraints_;
}
protected:
// Used to DCHECK that we are called on the correct thread.
base::ThreadChecker thread_checker_;
private:
// MediaStreamVideoSink is a friend to allow it to call AddSink() and
// RemoveSink().
friend class MediaStreamVideoSink;
FRIEND_TEST_ALL_PREFIXES(MediaStreamRemoteVideoSourceTest, StartTrack);
FRIEND_TEST_ALL_PREFIXES(MediaStreamRemoteVideoSourceTest, RemoteTrackStop);
FRIEND_TEST_ALL_PREFIXES(VideoDestinationHandlerTest, PutFrame);
// Add |sink| to receive state changes on the main render thread and video
// frames in the |callback| method on the IO-thread.
// |callback| will be reset on the render thread.
// These two methods are private such that no subclass can intercept and
// store the callback. This is important to ensure that we can release
// the callback on render thread without reference to it on the IO-thread.
void AddSink(MediaStreamVideoSink* sink,
const VideoCaptureDeliverFrameCB& callback);
void RemoveSink(MediaStreamVideoSink* sink);
// |FrameDeliverer| is an internal helper object used for delivering video
// frames on the IO-thread using callbacks to all registered tracks.
class FrameDeliverer;
scoped_refptr<FrameDeliverer> frame_deliverer_;
blink::WebMediaConstraints constraints_;
// Weak ref to the source this tracks is connected to. |source_| is owned
// by the blink::WebMediaStreamSource and is guaranteed to outlive the
// track.
MediaStreamVideoSource* source_;
DISALLOW_COPY_AND_ASSIGN(MediaStreamVideoTrack);
};
} // namespace content
#endif // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_TRACK_H_
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