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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 THIRD_PARTY_BLINK_RENDERER_MODULES_PEERCONNECTION_MEDIA_STREAM_VIDEO_WEBRTC_SINK_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_PEERCONNECTION_MEDIA_STREAM_VIDEO_WEBRTC_SINK_H_
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/threading/thread_checker.h"
#include "third_party/blink/public/platform/web_media_stream_track.h"
#include "third_party/blink/public/web/modules/mediastream/media_stream_video_sink.h"
#include "third_party/blink/renderer/modules/modules_export.h"
#include "third_party/webrtc/api/media_stream_interface.h"
namespace base {
class SingleThreadTaskRunner;
}
namespace blink {
class MediaStreamVideoTrack;
class PeerConnectionDependencyFactory;
class WebRtcVideoTrackSource;
// MediaStreamVideoWebRtcSink is an adapter between a
// MediaStreamVideoTrack object and a webrtc VideoTrack that is
// currently sent on a PeerConnection.
// The responsibility of the class is to create and own a representation of a
// webrtc VideoTrack that can be added and removed from a RTCPeerConnection. An
// instance of MediaStreamVideoWebRtcSink is created when a VideoTrack is added
// to an RTCPeerConnection object.
// Instances of this class is owned by the WebRtcMediaStreamAdapter object that
// created it.
class MODULES_EXPORT MediaStreamVideoWebRtcSink : public MediaStreamVideoSink {
public:
MediaStreamVideoWebRtcSink(
MediaStreamComponent* component,
PeerConnectionDependencyFactory* factory,
scoped_refptr<base::SingleThreadTaskRunner> task_runner);
~MediaStreamVideoWebRtcSink() override;
webrtc::VideoTrackInterface* webrtc_video_track() {
return video_track_.get();
}
absl::optional<bool> SourceNeedsDenoisingForTesting() const;
protected:
// Implementation of MediaStreamSink.
void OnEnabledChanged(bool enabled) override;
void OnContentHintChanged(
WebMediaStreamTrack::ContentHintType content_hint) override;
private:
// Helper to request a refresh frame from the source. Called via the callback
// passed to WebRtcVideoSourceAdapter.
void RequestRefreshFrame();
// Used to DCHECK that we are called on the correct thread.
THREAD_CHECKER(thread_checker_);
// |video_source_| and |video_source_proxy_| are held as
// references to outlive |video_track_| since the interfaces between them
// don't use reference counting.
scoped_refptr<WebRtcVideoTrackSource> video_source_;
scoped_refptr<webrtc::VideoTrackSourceInterface> video_source_proxy_;
scoped_refptr<webrtc::VideoTrackInterface> video_track_;
class WebRtcVideoSourceAdapter;
scoped_refptr<WebRtcVideoSourceAdapter> source_adapter_;
// Provides WebRtcVideoSourceAdapter a weak reference to
// MediaStreamVideoWebRtcSink in order to allow it to request refresh frames.
// See comments in media_stream_video_webrtc_sink.cc.
//
// TODO(crbug.com/787254): Make this object Oilpan-able, and get
// rid of this weak prt factory use.
base::WeakPtrFactory<MediaStreamVideoWebRtcSink> weak_factory_{this};
DISALLOW_COPY_AND_ASSIGN(MediaStreamVideoWebRtcSink);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_PEERCONNECTION_MEDIA_STREAM_VIDEO_WEBRTC_SINK_H_
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