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// Copyright (c) 2017 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_MEDIASTREAM_REMOTE_MEDIA_STREAM_TRACK_ADAPTER_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIASTREAM_REMOTE_MEDIA_STREAM_TRACK_ADAPTER_H_
#include "base/callback.h"
#include "base/logging.h"
#include "third_party/blink/public/platform/web_media_stream_source.h"
#include "third_party/blink/public/platform/web_media_stream_track.h"
#include "third_party/blink/public/platform/web_string.h"
#include "third_party/blink/renderer/modules/modules_export.h"
#include "third_party/blink/renderer/platform/wtf/thread_safe_ref_counted.h"
#include "third_party/webrtc/api/media_stream_interface.h"
namespace base {
class SingleThreadTaskRunner;
}
namespace blink {
class TrackObserver;
// Base class used for mapping between webrtc and blink MediaStream tracks.
// RemoteMediaStreamImpl has a RemoteMediaStreamTrackAdapter per remote audio
// (RemoteAudioTrackAdapter) and video (RemoteVideoTrackAdapter) track.
template <typename WebRtcMediaStreamTrackType>
class MODULES_EXPORT RemoteMediaStreamTrackAdapter
: public WTF::ThreadSafeRefCounted<
RemoteMediaStreamTrackAdapter<WebRtcMediaStreamTrackType>> {
public:
RemoteMediaStreamTrackAdapter(
const scoped_refptr<base::SingleThreadTaskRunner>& main_thread,
WebRtcMediaStreamTrackType* webrtc_track)
: main_thread_(main_thread),
webrtc_track_(webrtc_track),
id_(WebString::FromUTF8(webrtc_track->id())) {}
const scoped_refptr<WebRtcMediaStreamTrackType>& observed_track() {
return webrtc_track_;
}
WebMediaStreamTrack* web_track() {
DCHECK(main_thread_->BelongsToCurrentThread());
DCHECK(!web_track_.IsNull());
return &web_track_;
}
WebString id() const { return id_; }
bool initialized() const {
DCHECK(main_thread_->BelongsToCurrentThread());
return !web_track_.IsNull();
}
void Initialize() {
DCHECK(main_thread_->BelongsToCurrentThread());
DCHECK(!initialized());
std::move(web_initialize_).Run();
DCHECK(initialized());
}
protected:
friend class WTF::ThreadSafeRefCounted<
RemoteMediaStreamTrackAdapter<WebRtcMediaStreamTrackType>>;
virtual ~RemoteMediaStreamTrackAdapter() {
DCHECK(main_thread_->BelongsToCurrentThread());
}
void InitializeWebTrack(WebMediaStreamSource::Type type) {
DCHECK(main_thread_->BelongsToCurrentThread());
DCHECK(web_track_.IsNull());
WebMediaStreamSource web_source;
web_source.Initialize(id_, type, id_, true /* remote */);
web_track_.Initialize(id_, web_source);
DCHECK(!web_track_.IsNull());
}
const scoped_refptr<base::SingleThreadTaskRunner> main_thread_;
// This callback will be run when Initialize() is called and then freed.
// The callback is used by derived classes to bind objects that need to be
// instantiated and initialized on the signaling thread but then moved to
// and used on the main thread when initializing the web object(s).
base::OnceClosure web_initialize_;
private:
const scoped_refptr<WebRtcMediaStreamTrackType> webrtc_track_;
WebMediaStreamTrack web_track_;
// const copy of the webrtc track id that allows us to check it from both the
// main and signaling threads without incurring a synchronous thread hop.
const WebString id_;
DISALLOW_COPY_AND_ASSIGN(RemoteMediaStreamTrackAdapter);
};
class MODULES_EXPORT RemoteVideoTrackAdapter
: public RemoteMediaStreamTrackAdapter<webrtc::VideoTrackInterface> {
public:
// Called on the signaling thread.
RemoteVideoTrackAdapter(
const scoped_refptr<base::SingleThreadTaskRunner>& main_thread,
webrtc::VideoTrackInterface* webrtc_track);
protected:
~RemoteVideoTrackAdapter() override;
private:
void InitializeWebVideoTrack(std::unique_ptr<TrackObserver> observer,
bool enabled);
};
// RemoteAudioTrackAdapter is responsible for listening on state
// change notifications on a remote webrtc audio MediaStreamTracks and notify
// Blink.
class MODULES_EXPORT RemoteAudioTrackAdapter
: public RemoteMediaStreamTrackAdapter<webrtc::AudioTrackInterface>,
public webrtc::ObserverInterface {
public:
// Called on the signaling thread.
RemoteAudioTrackAdapter(
const scoped_refptr<base::SingleThreadTaskRunner>& main_thread,
webrtc::AudioTrackInterface* webrtc_track);
void Unregister();
protected:
~RemoteAudioTrackAdapter() override;
private:
void InitializeWebAudioTrack(
const scoped_refptr<base::SingleThreadTaskRunner>& main_thread);
// webrtc::ObserverInterface implementation.
void OnChanged() override;
void OnChangedOnMainThread(
webrtc::MediaStreamTrackInterface::TrackState state);
#if DCHECK_IS_ON()
bool unregistered_;
#endif
webrtc::MediaStreamTrackInterface::TrackState state_;
DISALLOW_COPY_AND_ASSIGN(RemoteAudioTrackAdapter);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIASTREAM_REMOTE_MEDIA_STREAM_TRACK_ADAPTER_H_
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