1 /* 2 * Copyright 2015 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef PC_MEDIA_STREAM_OBSERVER_H_ 12 #define PC_MEDIA_STREAM_OBSERVER_H_ 13 14 #include <functional> 15 16 #include "api/media_stream_interface.h" 17 #include "api/scoped_refptr.h" 18 19 namespace webrtc { 20 21 // Helper class which will listen for changes to a stream and emit the 22 // corresponding signals. 23 class MediaStreamObserver : public ObserverInterface { 24 public: 25 explicit MediaStreamObserver( 26 MediaStreamInterface* stream, 27 std::function<void(AudioTrackInterface*, MediaStreamInterface*)> 28 audio_track_added_callback, 29 std::function<void(AudioTrackInterface*, MediaStreamInterface*)> 30 audio_track_removed_callback, 31 std::function<void(VideoTrackInterface*, MediaStreamInterface*)> 32 video_track_added_callback, 33 std::function<void(VideoTrackInterface*, MediaStreamInterface*)> 34 video_track_removed_callback); 35 ~MediaStreamObserver() override; 36 stream()37 const MediaStreamInterface* stream() const { return stream_.get(); } 38 39 void OnChanged() override; 40 41 private: 42 rtc::scoped_refptr<MediaStreamInterface> stream_; 43 AudioTrackVector cached_audio_tracks_; 44 VideoTrackVector cached_video_tracks_; 45 const std::function<void(AudioTrackInterface*, MediaStreamInterface*)> 46 audio_track_added_callback_; 47 const std::function<void(AudioTrackInterface*, MediaStreamInterface*)> 48 audio_track_removed_callback_; 49 const std::function<void(VideoTrackInterface*, MediaStreamInterface*)> 50 video_track_added_callback_; 51 const std::function<void(VideoTrackInterface*, MediaStreamInterface*)> 52 video_track_removed_callback_; 53 }; 54 55 } // namespace webrtc 56 57 #endif // PC_MEDIA_STREAM_OBSERVER_H_ 58