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      1 /*
      2  * libjingle
      3  * Copyright 2011, Google Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  *  1. Redistributions of source code must retain the above copyright notice,
      9  *     this list of conditions and the following disclaimer.
     10  *  2. Redistributions in binary form must reproduce the above copyright notice,
     11  *     this list of conditions and the following disclaimer in the documentation
     12  *     and/or other materials provided with the distribution.
     13  *  3. The name of the author may not be used to endorse or promote products
     14  *     derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #ifndef TALK_APP_WEBRTC_MEDIASTREAMTRACK_H_
     29 #define TALK_APP_WEBRTC_MEDIASTREAMTRACK_H_
     30 
     31 #include <string>
     32 
     33 #include "talk/app/webrtc/mediastreaminterface.h"
     34 #include "talk/app/webrtc/notifier.h"
     35 
     36 namespace webrtc {
     37 
     38 // MediaTrack implements the interface common to AudioTrackInterface and
     39 // VideoTrackInterface.
     40 template <typename T>
     41 class MediaStreamTrack : public Notifier<T> {
     42  public:
     43   typedef typename T::TrackState TypedTrackState;
     44 
     45   virtual std::string id() const { return id_; }
     46   virtual MediaStreamTrackInterface::TrackState state() const {
     47     return state_;
     48   }
     49   virtual bool enabled() const { return enabled_; }
     50   virtual bool set_enabled(bool enable) {
     51     bool fire_on_change = (enable != enabled_);
     52     enabled_ = enable;
     53     if (fire_on_change) {
     54       Notifier<T>::FireOnChanged();
     55     }
     56     return fire_on_change;
     57   }
     58   virtual bool set_state(MediaStreamTrackInterface::TrackState new_state) {
     59     bool fire_on_change = (state_ != new_state);
     60     state_ = new_state;
     61     if (fire_on_change)
     62       Notifier<T>::FireOnChanged();
     63     return true;
     64   }
     65 
     66  protected:
     67   explicit MediaStreamTrack(const std::string& id)
     68       : enabled_(true),
     69         id_(id),
     70         state_(MediaStreamTrackInterface::kInitializing) {
     71   }
     72 
     73  private:
     74   bool enabled_;
     75   std::string id_;
     76   MediaStreamTrackInterface::TrackState state_;
     77 };
     78 
     79 }  // namespace webrtc
     80 
     81 #endif  // TALK_APP_WEBRTC_MEDIASTREAMTRACK_H_
     82