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// Copyright 2014 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_SOURCE_H_
#define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_SOURCE_H_
#include "base/compiler_specific.h"
#include "base/memory/ref_counted.h"
#include "content/common/content_export.h"
#include "content/renderer/media/media_stream_dependency_factory.h"
#include "content/renderer/media/media_stream_source.h"
#include "third_party/WebKit/public/platform/WebMediaConstraints.h"
#include "third_party/WebKit/public/platform/WebMediaStreamSource.h"
#include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
namespace media {
class VideoFrame;
}
namespace content {
class MediaStreamDependencyFactory;
// MediaStreamVideoSource is an interface used for sending video frames to a
// MediaStreamVideoTrack.
// http://dev.w3.org/2011/webrtc/editor/getusermedia.html
// All methods calls will be done from the main render thread.
class CONTENT_EXPORT MediaStreamVideoSource
: public MediaStreamSource,
NON_EXPORTED_BASE(public webrtc::ObserverInterface),
NON_EXPORTED_BASE(public base::NonThreadSafe) {
public:
explicit MediaStreamVideoSource(
MediaStreamDependencyFactory* factory);
// Puts |track| in the registered tracks list.
virtual void AddTrack(const blink::WebMediaStreamTrack& track,
const blink::WebMediaConstraints& constraints,
const ConstraintsCallback& callback) OVERRIDE;
virtual void RemoveTrack(const blink::WebMediaStreamTrack& track) OVERRIDE;
// TODO(ronghuawu): Remove webrtc::VideoSourceInterface from the public
// interface of this class.
webrtc::VideoSourceInterface* GetAdapter() {
return adapter_;
}
protected:
virtual void DoStopSource() OVERRIDE {}
// Called when the first track is added to this source.
// It currently creates a webrtc::VideoSourceInterface.
// If a derived class overrides this method, it must call SetAdapter.
virtual void InitAdapter(const blink::WebMediaConstraints& constraints);
// Set the webrtc::VideoSourceInterface adapter used by this class.
// It must be called by a derived class that overrides the InitAdapter method.
void SetAdapter(webrtc::VideoSourceInterface* adapter) {
DCHECK(!adapter_);
adapter_ = adapter;
}
MediaStreamDependencyFactory* factory() { return factory_; }
// Sets ready state and notifies the ready state to all registered tracks.
virtual void SetReadyState(blink::WebMediaStreamSource::ReadyState state);
// Delivers |frame| to registered tracks according to their constraints.
// Note: current implementation assumes |frame| be contiguous layout of image
// planes and I420.
virtual void DeliverVideoFrame(const scoped_refptr<media::VideoFrame>& frame);
// Implements webrtc::Observer.
virtual void OnChanged() OVERRIDE;
virtual ~MediaStreamVideoSource();
private:
// Checks if the underlying source state has changed from an initializing
// state to a final state and in that case trigger all callbacks in
// |constraints_callbacks_|.
void TriggerConstraintsCallbackOnStateChange();
bool initializing_;
MediaStreamDependencyFactory* factory_;
scoped_refptr<webrtc::VideoSourceInterface> adapter_;
int width_;
int height_;
base::TimeDelta first_frame_timestamp_;
blink::WebMediaConstraints current_constraints_;
std::vector<ConstraintsCallback> constraints_callbacks_;
DISALLOW_COPY_AND_ASSIGN(MediaStreamVideoSource);
};
} // namespace content
#endif // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_SOURCE_H_
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