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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 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 // Audio rendering unit utilizing audio output stream provided by browser | 5 // Audio rendering unit utilizing audio output stream provided by browser |
6 // process through IPC. | 6 // process through IPC. |
7 // | 7 // |
8 // Relationship of classes. | 8 // Relationship of classes. |
9 // | 9 // |
10 // AudioOutputController AudioOutputDevice | 10 // AudioOutputController AudioOutputDevice |
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82 const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner); | 82 const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner); |
83 | 83 |
84 // Initialize the stream using |session_id|, which is used for the browser | 84 // Initialize the stream using |session_id|, which is used for the browser |
85 // to select the correct input device. | 85 // to select the correct input device. |
86 void InitializeWithSessionId(const AudioParameters& params, | 86 void InitializeWithSessionId(const AudioParameters& params, |
87 RenderCallback* callback, | 87 RenderCallback* callback, |
88 int session_id); | 88 int session_id); |
89 | 89 |
90 // AudioRendererSink implementation. | 90 // AudioRendererSink implementation. |
91 virtual void Initialize(const AudioParameters& params, | 91 virtual void Initialize(const AudioParameters& params, |
92 RenderCallback* callback) OVERRIDE; | 92 RenderCallback* callback) override; |
93 virtual void Start() OVERRIDE; | 93 virtual void Start() override; |
94 virtual void Stop() OVERRIDE; | 94 virtual void Stop() override; |
95 virtual void Play() OVERRIDE; | 95 virtual void Play() override; |
96 virtual void Pause() OVERRIDE; | 96 virtual void Pause() override; |
97 virtual bool SetVolume(double volume) OVERRIDE; | 97 virtual bool SetVolume(double volume) override; |
98 | 98 |
99 // Methods called on IO thread ---------------------------------------------- | 99 // Methods called on IO thread ---------------------------------------------- |
100 // AudioOutputIPCDelegate methods. | 100 // AudioOutputIPCDelegate methods. |
101 virtual void OnStateChanged(AudioOutputIPCDelegate::State state) OVERRIDE; | 101 virtual void OnStateChanged(AudioOutputIPCDelegate::State state) override; |
102 virtual void OnStreamCreated(base::SharedMemoryHandle handle, | 102 virtual void OnStreamCreated(base::SharedMemoryHandle handle, |
103 base::SyncSocket::Handle socket_handle, | 103 base::SyncSocket::Handle socket_handle, |
104 int length) OVERRIDE; | 104 int length) override; |
105 virtual void OnIPCClosed() OVERRIDE; | 105 virtual void OnIPCClosed() override; |
106 | 106 |
107 protected: | 107 protected: |
108 // Magic required by ref_counted.h to avoid any code deleting the object | 108 // Magic required by ref_counted.h to avoid any code deleting the object |
109 // accidentally while there are references to it. | 109 // accidentally while there are references to it. |
110 friend class base::RefCountedThreadSafe<AudioOutputDevice>; | 110 friend class base::RefCountedThreadSafe<AudioOutputDevice>; |
111 virtual ~AudioOutputDevice(); | 111 virtual ~AudioOutputDevice(); |
112 | 112 |
113 private: | 113 private: |
114 // Note: The ordering of members in this enum is critical to correct behavior! | 114 // Note: The ordering of members in this enum is critical to correct behavior! |
115 enum State { | 115 enum State { |
116 IPC_CLOSED, // No more IPCs can take place. | 116 IPC_CLOSED, // No more IPCs can take place. |
117 IDLE, // Not started. | 117 IDLE, // Not started. |
118 CREATING_STREAM, // Waiting for OnStreamCreated() to be called back. | 118 CREATING_STREAM, // Waiting for OnStreamCreated() to be called back. |
119 PAUSED, // Paused. OnStreamCreated() has been called. Can Play()/Stop(). | 119 PAUSED, // Paused. OnStreamCreated() has been called. Can Play()/Stop(). |
120 PLAYING, // Playing back. Can Pause()/Stop(). | 120 PLAYING, // Playing back. Can Pause()/Stop(). |
121 }; | 121 }; |
122 | 122 |
123 // Methods called on IO thread ---------------------------------------------- | 123 // Methods called on IO thread ---------------------------------------------- |
124 // The following methods are tasks posted on the IO thread that need to | 124 // The following methods are tasks posted on the IO thread that need to |
125 // be executed on that thread. They use AudioOutputIPC to send IPC messages | 125 // be executed on that thread. They use AudioOutputIPC to send IPC messages |
126 // upon state changes. | 126 // upon state changes. |
127 void CreateStreamOnIOThread(const AudioParameters& params); | 127 void CreateStreamOnIOThread(const AudioParameters& params); |
128 void PlayOnIOThread(); | 128 void PlayOnIOThread(); |
129 void PauseOnIOThread(); | 129 void PauseOnIOThread(); |
130 void ShutDownOnIOThread(); | 130 void ShutDownOnIOThread(); |
131 void SetVolumeOnIOThread(double volume); | 131 void SetVolumeOnIOThread(double volume); |
132 | 132 |
133 // base::MessageLoop::DestructionObserver implementation for the IO loop. | 133 // base::MessageLoop::DestructionObserver implementation for the IO loop. |
134 // If the IO loop dies before we do, we shut down the audio thread from here. | 134 // If the IO loop dies before we do, we shut down the audio thread from here. |
135 virtual void WillDestroyCurrentMessageLoop() OVERRIDE; | 135 virtual void WillDestroyCurrentMessageLoop() override; |
136 | 136 |
137 AudioParameters audio_parameters_; | 137 AudioParameters audio_parameters_; |
138 | 138 |
139 RenderCallback* callback_; | 139 RenderCallback* callback_; |
140 | 140 |
141 // A pointer to the IPC layer that takes care of sending requests over to | 141 // A pointer to the IPC layer that takes care of sending requests over to |
142 // the AudioRendererHost. Only valid when state_ != IPC_CLOSED and must only | 142 // the AudioRendererHost. Only valid when state_ != IPC_CLOSED and must only |
143 // be accessed on the IO thread. | 143 // be accessed on the IO thread. |
144 scoped_ptr<AudioOutputIPC> ipc_; | 144 scoped_ptr<AudioOutputIPC> ipc_; |
145 | 145 |
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170 // TODO(scherkus): Replace this by changing AudioRendererSink to either accept | 170 // TODO(scherkus): Replace this by changing AudioRendererSink to either accept |
171 // the callback via Start(). See http://crbug.com/151051 for details. | 171 // the callback via Start(). See http://crbug.com/151051 for details. |
172 bool stopping_hack_; | 172 bool stopping_hack_; |
173 | 173 |
174 DISALLOW_COPY_AND_ASSIGN(AudioOutputDevice); | 174 DISALLOW_COPY_AND_ASSIGN(AudioOutputDevice); |
175 }; | 175 }; |
176 | 176 |
177 } // namespace media | 177 } // namespace media |
178 | 178 |
179 #endif // MEDIA_AUDIO_AUDIO_OUTPUT_DEVICE_H_ | 179 #endif // MEDIA_AUDIO_AUDIO_OUTPUT_DEVICE_H_ |
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