1 /*
2  * libjingle
3  * Copyright 2014 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_REMOTEAUDIOSOURCE_H_
29 #define TALK_APP_WEBRTC_REMOTEAUDIOSOURCE_H_
30 
31 #include <list>
32 #include <string>
33 
34 #include "talk/app/webrtc/mediastreaminterface.h"
35 #include "talk/app/webrtc/notifier.h"
36 #include "talk/media/base/audiorenderer.h"
37 #include "webrtc/audio/audio_sink.h"
38 #include "webrtc/base/criticalsection.h"
39 
40 namespace rtc {
41 struct Message;
42 class Thread;
43 }  // namespace rtc
44 
45 namespace webrtc {
46 
47 class AudioProviderInterface;
48 
49 // This class implements the audio source used by the remote audio track.
50 class RemoteAudioSource : public Notifier<AudioSourceInterface> {
51  public:
52   // Creates an instance of RemoteAudioSource.
53   static rtc::scoped_refptr<RemoteAudioSource> Create(
54       uint32_t ssrc,
55       AudioProviderInterface* provider);
56 
57   // MediaSourceInterface implementation.
58   MediaSourceInterface::SourceState state() const override;
59   bool remote() const override;
60 
61   void AddSink(AudioTrackSinkInterface* sink) override;
62   void RemoveSink(AudioTrackSinkInterface* sink) override;
63 
64  protected:
65   RemoteAudioSource();
66   ~RemoteAudioSource() override;
67 
68   // Post construction initialize where we can do things like save a reference
69   // to ourselves (need to be fully constructed).
70   void Initialize(uint32_t ssrc, AudioProviderInterface* provider);
71 
72  private:
73   typedef std::list<AudioObserver*> AudioObserverList;
74 
75   // AudioSourceInterface implementation.
76   void SetVolume(double volume) override;
77   void RegisterAudioObserver(AudioObserver* observer) override;
78   void UnregisterAudioObserver(AudioObserver* observer) override;
79 
80   class Sink;
81   void OnData(const AudioSinkInterface::Data& audio);
82   void OnAudioProviderGone();
83 
84   class MessageHandler;
85   void OnMessage(rtc::Message* msg);
86 
87   AudioObserverList audio_observers_;
88   rtc::CriticalSection sink_lock_;
89   std::list<AudioTrackSinkInterface*> sinks_;
90   rtc::Thread* const main_thread_;
91   SourceState state_;
92 };
93 
94 }  // namespace webrtc
95 
96 #endif  // TALK_APP_WEBRTC_REMOTEAUDIOSOURCE_H_
97