media_stream_observer.h

Enable keyboard shortcuts

/*

 *  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_