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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 #ifndef MEDIA_AUDIO_AUDIO_MANAGER_H_ | 5 #ifndef MEDIA_AUDIO_AUDIO_MANAGER_H_ |
6 #define MEDIA_AUDIO_AUDIO_MANAGER_H_ | 6 #define MEDIA_AUDIO_AUDIO_MANAGER_H_ |
7 | 7 |
8 #include <string> | 8 #include <string> |
9 | 9 |
10 #include "base/basictypes.h" | 10 #include "base/basictypes.h" |
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99 // with 0 suggesting that the implementation use a default value for that | 99 // with 0 suggesting that the implementation use a default value for that |
100 // platform. | 100 // platform. |
101 // Returns NULL if the combination of the parameters is not supported, or if | 101 // Returns NULL if the combination of the parameters is not supported, or if |
102 // we have reached some other platform specific limit. | 102 // we have reached some other platform specific limit. |
103 // | 103 // |
104 // Do not free the returned AudioInputStream. It is owned by AudioManager. | 104 // Do not free the returned AudioInputStream. It is owned by AudioManager. |
105 // When you are done with it, call |Stop()| and |Close()| to release it. | 105 // When you are done with it, call |Stop()| and |Close()| to release it. |
106 virtual AudioInputStream* MakeAudioInputStream( | 106 virtual AudioInputStream* MakeAudioInputStream( |
107 const AudioParameters& params, const std::string& device_id) = 0; | 107 const AudioParameters& params, const std::string& device_id) = 0; |
108 | 108 |
109 // Used to determine if something else is currently making use of audio input. | |
110 virtual bool IsRecordingInProcess() = 0; | |
111 | |
112 // Returns message loop used for audio IO. | 109 // Returns message loop used for audio IO. |
113 virtual scoped_refptr<base::MessageLoopProxy> GetMessageLoop() = 0; | 110 virtual scoped_refptr<base::MessageLoopProxy> GetMessageLoop() = 0; |
114 | 111 |
115 // Heavyweight tasks should use GetWorkerLoop() instead of GetMessageLoop(). | 112 // Heavyweight tasks should use GetWorkerLoop() instead of GetMessageLoop(). |
116 // On most platforms they are the same, but some share the UI loop with the | 113 // On most platforms they are the same, but some share the UI loop with the |
117 // audio IO loop. | 114 // audio IO loop. |
118 virtual scoped_refptr<base::MessageLoopProxy> GetWorkerLoop() = 0; | 115 virtual scoped_refptr<base::MessageLoopProxy> GetWorkerLoop() = 0; |
119 | 116 |
120 // Allows clients to listen for device state changes; e.g. preferred sample | 117 // Allows clients to listen for device state changes; e.g. preferred sample |
121 // rate or channel layout changes. The typical response to receiving this | 118 // rate or channel layout changes. The typical response to receiving this |
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144 protected: | 141 protected: |
145 AudioManager(); | 142 AudioManager(); |
146 | 143 |
147 private: | 144 private: |
148 DISALLOW_COPY_AND_ASSIGN(AudioManager); | 145 DISALLOW_COPY_AND_ASSIGN(AudioManager); |
149 }; | 146 }; |
150 | 147 |
151 } // namespace media | 148 } // namespace media |
152 | 149 |
153 #endif // MEDIA_AUDIO_AUDIO_MANAGER_H_ | 150 #endif // MEDIA_AUDIO_AUDIO_MANAGER_H_ |
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