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 
id()45   virtual std::string id() const { return id_; }
state()46   virtual MediaStreamTrackInterface::TrackState state() const {
47     return state_;
48   }
enabled()49   virtual bool enabled() const { return enabled_; }
set_enabled(bool enable)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   }
set_state(MediaStreamTrackInterface::TrackState new_state)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:
MediaStreamTrack(const std::string & id)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