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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 // | 4 // |
5 // Low-latency audio rendering unit utilizing audio output stream provided | 5 // Low-latency audio rendering unit utilizing audio output stream provided |
6 // by browser process through IPC. | 6 // by browser process through IPC. |
7 // | 7 // |
8 // Relationship of classes. | 8 // Relationship of classes. |
9 // | 9 // |
10 // AudioOutputController AudioDevice | 10 // AudioOutputController AudioDevice |
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99 void GetVolume(double* volume); | 99 void GetVolume(double* volume); |
100 | 100 |
101 double sample_rate() const { return sample_rate_; } | 101 double sample_rate() const { return sample_rate_; } |
102 size_t buffer_size() const { return buffer_size_; } | 102 size_t buffer_size() const { return buffer_size_; } |
103 | 103 |
104 static double GetAudioHardwareSampleRate(); | 104 static double GetAudioHardwareSampleRate(); |
105 static size_t GetAudioHardwareBufferSize(); | 105 static size_t GetAudioHardwareBufferSize(); |
106 | 106 |
107 // Methods called on IO thread ---------------------------------------------- | 107 // Methods called on IO thread ---------------------------------------------- |
108 // AudioMessageFilter::Delegate methods, called by AudioMessageFilter. | 108 // AudioMessageFilter::Delegate methods, called by AudioMessageFilter. |
109 virtual void OnRequestPacket(AudioBuffersState buffers_state); | 109 virtual void OnRequestPacket(AudioBuffersState buffers_state) OVERRIDE; |
110 virtual void OnStateChanged(AudioStreamState state); | 110 virtual void OnStateChanged(AudioStreamState state) OVERRIDE; |
111 virtual void OnCreated(base::SharedMemoryHandle handle, uint32 length); | 111 virtual void OnCreated(base::SharedMemoryHandle handle, |
| 112 uint32 length) OVERRIDE; |
112 virtual void OnLowLatencyCreated(base::SharedMemoryHandle handle, | 113 virtual void OnLowLatencyCreated(base::SharedMemoryHandle handle, |
113 base::SyncSocket::Handle socket_handle, | 114 base::SyncSocket::Handle socket_handle, |
114 uint32 length); | 115 uint32 length) OVERRIDE; |
115 virtual void OnVolume(double volume); | 116 virtual void OnVolume(double volume) OVERRIDE; |
116 | 117 |
117 private: | 118 private: |
118 // Methods called on IO thread ---------------------------------------------- | 119 // Methods called on IO thread ---------------------------------------------- |
119 // The following methods are tasks posted on the IO thread that needs to | 120 // The following methods are tasks posted on the IO thread that needs to |
120 // be executed on that thread. They interact with AudioMessageFilter and | 121 // be executed on that thread. They interact with AudioMessageFilter and |
121 // sends IPC messages on that thread. | 122 // sends IPC messages on that thread. |
122 void InitializeOnIOThread(const AudioParameters& params); | 123 void InitializeOnIOThread(const AudioParameters& params); |
123 void StartOnIOThread(); | 124 void StartOnIOThread(); |
124 void ShutDownOnIOThread(base::WaitableEvent* completion); | 125 void ShutDownOnIOThread(base::WaitableEvent* completion); |
125 void SetVolumeOnIOThread(double volume); | 126 void SetVolumeOnIOThread(double volume); |
126 | 127 |
127 void Send(IPC::Message* message); | 128 void Send(IPC::Message* message); |
128 | 129 |
129 // Method called on the audio thread (+ one call on the IO thread) ---------- | 130 // Method called on the audio thread (+ one call on the IO thread) ---------- |
130 // Calls the client's callback for rendering audio. There will also be one | 131 // Calls the client's callback for rendering audio. There will also be one |
131 // initial call on the IO thread before the audio thread has been created. | 132 // initial call on the IO thread before the audio thread has been created. |
132 void FireRenderCallback(); | 133 void FireRenderCallback(); |
133 | 134 |
134 // DelegateSimpleThread::Delegate implementation. | 135 // DelegateSimpleThread::Delegate implementation. |
135 virtual void Run(); | 136 virtual void Run() OVERRIDE; |
136 | 137 |
137 // Format | 138 // Format |
138 size_t buffer_size_; // in sample-frames | 139 size_t buffer_size_; // in sample-frames |
139 int channels_; | 140 int channels_; |
140 int bits_per_sample_; | 141 int bits_per_sample_; |
141 double sample_rate_; | 142 double sample_rate_; |
142 | 143 |
143 RenderCallback* callback_; | 144 RenderCallback* callback_; |
144 | 145 |
145 // The client callback renders audio into here. | 146 // The client callback renders audio into here. |
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169 | 170 |
170 // Data transfer between browser and render process uses a combination | 171 // Data transfer between browser and render process uses a combination |
171 // of sync sockets and shared memory to provide lowest possible latency. | 172 // of sync sockets and shared memory to provide lowest possible latency. |
172 scoped_ptr<base::SharedMemory> shared_memory_; | 173 scoped_ptr<base::SharedMemory> shared_memory_; |
173 scoped_ptr<base::SyncSocket> socket_; | 174 scoped_ptr<base::SyncSocket> socket_; |
174 | 175 |
175 DISALLOW_IMPLICIT_CONSTRUCTORS(AudioDevice); | 176 DISALLOW_IMPLICIT_CONSTRUCTORS(AudioDevice); |
176 }; | 177 }; |
177 | 178 |
178 #endif // CONTENT_RENDERER_MEDIA_AUDIO_DEVICE_H_ | 179 #endif // CONTENT_RENDERER_MEDIA_AUDIO_DEVICE_H_ |
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