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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 // AudioOutputMixer is a class that implements browser-side audio mixer. | |
| 6 // AudioOutputMixer implements both AudioOutputDispatcher and | |
| 7 // AudioSourceCallback interfaces. | |
| 8 | |
| 9 #ifndef MEDIA_AUDIO_AUDIO_OUTPUT_MIXER_H_ | |
| 10 #define MEDIA_AUDIO_AUDIO_OUTPUT_MIXER_H_ | |
| 11 | |
| 12 #include <map> | |
| 13 | |
| 14 #include "base/basictypes.h" | |
| 15 #include "base/memory/ref_counted.h" | |
| 16 #include "base/memory/scoped_ptr.h" | |
| 17 #include "base/memory/weak_ptr.h" | |
| 18 #include "base/synchronization/lock.h" | |
| 19 #include "base/timer.h" | |
| 20 #include "media/audio/audio_io.h" | |
| 21 #include "media/audio/audio_manager.h" | |
| 22 #include "media/audio/audio_output_dispatcher.h" | |
| 23 #include "media/audio/audio_parameters.h" | |
| 24 | |
| 25 namespace media { | |
| 26 | |
| 27 class MEDIA_EXPORT AudioOutputMixer | |
| 28 : public AudioOutputDispatcher, | |
| 29 public AudioOutputStream::AudioSourceCallback { | |
| 30 public: | |
| 31 AudioOutputMixer(AudioManager* audio_manager, | |
| 32 const AudioParameters& params, | |
| 33 const base::TimeDelta& close_delay); | |
| 34 | |
| 35 // AudioOutputDispatcher interface. | |
| 36 virtual bool OpenStream() OVERRIDE; | |
| 37 virtual bool StartStream(AudioOutputStream::AudioSourceCallback* callback, | |
| 38 AudioOutputProxy* stream_proxy) OVERRIDE; | |
| 39 virtual void StopStream(AudioOutputProxy* stream_proxy) OVERRIDE; | |
| 40 virtual void StreamVolumeSet(AudioOutputProxy* stream_proxy, | |
| 41 double volume) OVERRIDE; | |
| 42 virtual void CloseStream(AudioOutputProxy* stream_proxy) OVERRIDE; | |
| 43 virtual void Shutdown() OVERRIDE; | |
| 44 | |
| 45 // AudioSourceCallback interface. | |
| 46 virtual uint32 OnMoreData(uint8* dest, | |
| 47 uint32 max_size, | |
| 48 AudioBuffersState buffers_state) OVERRIDE; | |
| 49 virtual void OnError(AudioOutputStream* stream, int code) OVERRIDE; | |
| 50 virtual void WaitTillDataReady() OVERRIDE; | |
| 51 | |
| 52 private: | |
| 53 friend class base::RefCountedThreadSafe<AudioOutputMixer>; | |
| 54 virtual ~AudioOutputMixer(); | |
| 55 | |
| 56 // Called by |close_timer_|. Closes physical stream. | |
| 57 void ClosePhysicalStream(); | |
| 58 | |
| 59 // The |lock_| must be acquired whenever we modify |proxies_| in the audio | |
| 60 // manager thread or accessing it in the hardware audio thread. Read in the | |
| 61 // audio manager thread is safe. | |
| 62 base::Lock lock_; | |
| 63 | |
| 64 // List of audio output proxies currently being played. | |
| 65 // For every proxy we store aux structure containing data necessary for | |
| 66 // mixing. | |
| 67 struct ProxyData { | |
| 68 AudioOutputStream::AudioSourceCallback* audio_source_callback; | |
| 69 double volume; | |
| 70 int pending_bytes; | |
| 71 }; | |
| 72 typedef std::map<AudioOutputProxy*, ProxyData> ProxyMap; | |
| 73 ProxyMap proxies_; | |
| 74 | |
| 75 // Physical stream for this mixer. | |
| 76 scoped_ptr<AudioOutputStream> physical_stream_; | |
| 77 | |
| 78 // Temporary buffer used when mixing. Allocated in the constructor | |
| 79 // to avoid constant allocation/deallocation in the callback. | |
| 80 scoped_array<uint8> mixer_data_; | |
| 81 | |
| 82 // Used to post delayed tasks to ourselves that we cancel inside Shutdown(). | |
| 83 base::WeakPtrFactory<AudioOutputMixer> weak_this_; | |
| 84 base::DelayTimer<AudioOutputMixer> close_timer_; | |
| 85 | |
| 86 // Size of data in all in-flight buffers. | |
| 87 int pending_bytes_; | |
| 88 | |
| 89 DISALLOW_COPY_AND_ASSIGN(AudioOutputMixer); | |
| 90 }; | |
| 91 | |
| 92 } // namespace media | |
| 93 | |
| 94 #endif // MEDIA_AUDIO_AUDIO_OUTPUT_MIXER_H_ | |
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