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
36namespace webrtc {
37
38// MediaTrack implements the interface common to AudioTrackInterface and
39// VideoTrackInterface.
40template <typename T>
41class 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