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/*
* Copyright 2011 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 API_MEDIA_STREAM_TRACK_H_
#define API_MEDIA_STREAM_TRACK_H_
#include <string>
#include "absl/strings/string_view.h"
#include "api/media_stream_interface.h"
#include "api/notifier.h"
namespace webrtc {
// MediaTrack implements the interface common to AudioTrackInterface and
// VideoTrackInterface.
template <typename T>
class MediaStreamTrack : public Notifier<T> {
public:
typedef typename T::TrackState TypedTrackState;
std::string id() const override { return id_; }
MediaStreamTrackInterface::TrackState state() const override {
return state_;
}
bool enabled() const override { return enabled_; }
bool set_enabled(bool enable) override {
bool fire_on_change = (enable != enabled_);
enabled_ = enable;
if (fire_on_change) {
Notifier<T>::FireOnChanged();
}
return fire_on_change;
}
void set_ended() { set_state(MediaStreamTrackInterface::TrackState::kEnded); }
protected:
explicit MediaStreamTrack(absl::string_view id)
: enabled_(true), id_(id), state_(MediaStreamTrackInterface::kLive) {}
bool set_state(MediaStreamTrackInterface::TrackState new_state) {
bool fire_on_change = (state_ != new_state);
state_ = new_state;
if (fire_on_change)
Notifier<T>::FireOnChanged();
return true;
}
private:
bool enabled_;
const std::string id_;
MediaStreamTrackInterface::TrackState state_;
};
} // namespace webrtc
#endif // API_MEDIA_STREAM_TRACK_H_
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