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/*
* Copyright 2015 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef PC_MEDIA_STREAM_OBSERVER_H_
#define PC_MEDIA_STREAM_OBSERVER_H_
#include <functional>
#include "api/media_stream_interface.h"
#include "api/scoped_refptr.h"
namespace webrtc {
// Helper class which will listen for changes to a stream and emit the
// corresponding signals.
class MediaStreamObserver : public ObserverInterface {
public:
explicit MediaStreamObserver(
MediaStreamInterface* stream,
std::function<void(AudioTrackInterface*, MediaStreamInterface*)>
audio_track_added_callback,
std::function<void(AudioTrackInterface*, MediaStreamInterface*)>
audio_track_removed_callback,
std::function<void(VideoTrackInterface*, MediaStreamInterface*)>
video_track_added_callback,
std::function<void(VideoTrackInterface*, MediaStreamInterface*)>
video_track_removed_callback);
~MediaStreamObserver() override;
const MediaStreamInterface* stream() const { return stream_.get(); }
void OnChanged() override;
private:
rtc::scoped_refptr<MediaStreamInterface> stream_;
AudioTrackVector cached_audio_tracks_;
VideoTrackVector cached_video_tracks_;
const std::function<void(AudioTrackInterface*, MediaStreamInterface*)>
audio_track_added_callback_;
const std::function<void(AudioTrackInterface*, MediaStreamInterface*)>
audio_track_removed_callback_;
const std::function<void(VideoTrackInterface*, MediaStreamInterface*)>
video_track_added_callback_;
const std::function<void(VideoTrackInterface*, MediaStreamInterface*)>
video_track_removed_callback_;
};
} // namespace webrtc
#endif // PC_MEDIA_STREAM_OBSERVER_H_
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