media_stream_track.h (1862B)
1 /* 2 * Copyright 2011 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 API_MEDIA_STREAM_TRACK_H_ 12 #define API_MEDIA_STREAM_TRACK_H_ 13 14 #include <string> 15 16 #include "absl/strings/string_view.h" 17 #include "api/media_stream_interface.h" 18 #include "api/notifier.h" 19 20 namespace webrtc { 21 22 // MediaTrack implements the interface common to AudioTrackInterface and 23 // VideoTrackInterface. 24 template <typename T> 25 class MediaStreamTrack : public Notifier<T> { 26 public: 27 typedef typename T::TrackState TypedTrackState; 28 29 std::string id() const override { return id_; } 30 MediaStreamTrackInterface::TrackState state() const override { 31 return state_; 32 } 33 bool enabled() const override { return enabled_; } 34 bool set_enabled(bool enable) override { 35 bool fire_on_change = (enable != enabled_); 36 enabled_ = enable; 37 if (fire_on_change) { 38 Notifier<T>::FireOnChanged(); 39 } 40 return fire_on_change; 41 } 42 void set_ended() { set_state(MediaStreamTrackInterface::TrackState::kEnded); } 43 44 protected: 45 explicit MediaStreamTrack(absl::string_view id) 46 : enabled_(true), id_(id), state_(MediaStreamTrackInterface::kLive) {} 47 48 bool set_state(MediaStreamTrackInterface::TrackState new_state) { 49 bool fire_on_change = (state_ != new_state); 50 state_ = new_state; 51 if (fire_on_change) 52 Notifier<T>::FireOnChanged(); 53 return true; 54 } 55 56 private: 57 bool enabled_; 58 const std::string id_; 59 MediaStreamTrackInterface::TrackState state_; 60 }; 61 62 } // namespace webrtc 63 64 #endif // API_MEDIA_STREAM_TRACK_H_