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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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| 75 // we have reached some other platform specific limit. | 75 // we have reached some other platform specific limit. |
| 76 // | 76 // |
| 77 // |params.format| can be set to AUDIO_PCM_LOW_LATENCY and that has two | 77 // |params.format| can be set to AUDIO_PCM_LOW_LATENCY and that has two |
| 78 // effects: | 78 // effects: |
| 79 // 1- Instead of triple buffered the audio will be double buffered. | 79 // 1- Instead of triple buffered the audio will be double buffered. |
| 80 // 2- A low latency driver or alternative audio subsystem will be used when | 80 // 2- A low latency driver or alternative audio subsystem will be used when |
| 81 // available. | 81 // available. |
| 82 // | 82 // |
| 83 // Do not free the returned AudioOutputStream. It is owned by AudioManager. | 83 // Do not free the returned AudioOutputStream. It is owned by AudioManager. |
| 84 virtual AudioOutputStream* MakeAudioOutputStream( | 84 virtual AudioOutputStream* MakeAudioOutputStream( |
| 85 const AudioParameters& params) = 0; | 85 const AudioParameters& params, const std::string& input_device_id) = 0; |
| 86 | 86 |
| 87 // Creates new audio output proxy. A proxy implements | 87 // Creates new audio output proxy. A proxy implements |
| 88 // AudioOutputStream interface, but unlike regular output stream | 88 // AudioOutputStream interface, but unlike regular output stream |
| 89 // created with MakeAudioOutputStream() it opens device only when a | 89 // created with MakeAudioOutputStream() it opens device only when a |
| 90 // sound is actually playing. | 90 // sound is actually playing. |
| 91 virtual AudioOutputStream* MakeAudioOutputStreamProxy( | 91 virtual AudioOutputStream* MakeAudioOutputStreamProxy( |
| 92 const AudioParameters& params) = 0; | 92 const AudioParameters& params, const std::string& input_device_id) = 0; |
| 93 | 93 |
| 94 // Factory to create audio recording streams. | 94 // Factory to create audio recording streams. |
| 95 // |channels| can be 1 or 2. | 95 // |channels| can be 1 or 2. |
| 96 // |sample_rate| is in hertz and can be any value supported by the platform. | 96 // |sample_rate| is in hertz and can be any value supported by the platform. |
| 97 // |bits_per_sample| can be any value supported by the platform. | 97 // |bits_per_sample| can be any value supported by the platform. |
| 98 // |samples_per_packet| is in hertz as well and can be 0 to |sample_rate|, | 98 // |samples_per_packet| is in hertz as well and can be 0 to |sample_rate|, |
| 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. |
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| 139 protected: | 139 protected: |
| 140 AudioManager(); | 140 AudioManager(); |
| 141 | 141 |
| 142 private: | 142 private: |
| 143 DISALLOW_COPY_AND_ASSIGN(AudioManager); | 143 DISALLOW_COPY_AND_ASSIGN(AudioManager); |
| 144 }; | 144 }; |
| 145 | 145 |
| 146 } // namespace media | 146 } // namespace media |
| 147 | 147 |
| 148 #endif // MEDIA_AUDIO_AUDIO_MANAGER_H_ | 148 #endif // MEDIA_AUDIO_AUDIO_MANAGER_H_ |
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