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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_IO_H_ | 5 #ifndef MEDIA_AUDIO_AUDIO_IO_H_ |
| 6 #define MEDIA_AUDIO_AUDIO_IO_H_ | 6 #define MEDIA_AUDIO_AUDIO_IO_H_ |
| 7 | 7 |
| 8 #include <stdint.h> |
| 9 |
| 8 #include "media/base/audio_bus.h" | 10 #include "media/base/audio_bus.h" |
| 9 | 11 |
| 10 // Low-level audio output support. To make sound there are 3 objects involved: | 12 // Low-level audio output support. To make sound there are 3 objects involved: |
| 11 // - AudioSource : produces audio samples on a pull model. Implements | 13 // - AudioSource : produces audio samples on a pull model. Implements |
| 12 // the AudioSourceCallback interface. | 14 // the AudioSourceCallback interface. |
| 13 // - AudioOutputStream : uses the AudioSource to render audio on a given | 15 // - AudioOutputStream : uses the AudioSource to render audio on a given |
| 14 // channel, format and sample frequency configuration. Data from the | 16 // channel, format and sample frequency configuration. Data from the |
| 15 // AudioSource is delivered in a 'pull' model. | 17 // AudioSource is delivered in a 'pull' model. |
| 16 // - AudioManager : factory for the AudioOutputStream objects, manager | 18 // - AudioManager : factory for the AudioOutputStream objects, manager |
| 17 // of the hardware resources and mixer control. | 19 // of the hardware resources and mixer control. |
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| 166 // Returns the Automatic Gain Control (AGC) state. | 168 // Returns the Automatic Gain Control (AGC) state. |
| 167 virtual bool GetAutomaticGainControl() = 0; | 169 virtual bool GetAutomaticGainControl() = 0; |
| 168 | 170 |
| 169 // Returns the current muting state for the microphone. | 171 // Returns the current muting state for the microphone. |
| 170 virtual bool IsMuted() = 0; | 172 virtual bool IsMuted() = 0; |
| 171 }; | 173 }; |
| 172 | 174 |
| 173 } // namespace media | 175 } // namespace media |
| 174 | 176 |
| 175 #endif // MEDIA_AUDIO_AUDIO_IO_H_ | 177 #endif // MEDIA_AUDIO_AUDIO_IO_H_ |
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