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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 // Implementation of AudioInputStream for Mac OS X using the special AUHAL | 5 // Implementation of AudioInputStream for Mac OS X using the special AUHAL |
6 // input Audio Unit present in OS 10.4 and later. | 6 // input Audio Unit present in OS 10.4 and later. |
7 // The AUHAL input Audio Unit is for low-latency audio I/O. | 7 // The AUHAL input Audio Unit is for low-latency audio I/O. |
8 // | 8 // |
9 // Overview of operation: | 9 // Overview of operation: |
10 // | 10 // |
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32 // latency; | 32 // latency; |
33 // 2) The delay between the actual recording instant and the time when the | 33 // 2) The delay between the actual recording instant and the time when the |
34 // data packet is provided as a callback. | 34 // data packet is provided as a callback. |
35 // | 35 // |
36 #ifndef MEDIA_AUDIO_MAC_AUDIO_LOW_LATENCY_INPUT_MAC_H_ | 36 #ifndef MEDIA_AUDIO_MAC_AUDIO_LOW_LATENCY_INPUT_MAC_H_ |
37 #define MEDIA_AUDIO_MAC_AUDIO_LOW_LATENCY_INPUT_MAC_H_ | 37 #define MEDIA_AUDIO_MAC_AUDIO_LOW_LATENCY_INPUT_MAC_H_ |
38 | 38 |
39 #include <AudioUnit/AudioUnit.h> | 39 #include <AudioUnit/AudioUnit.h> |
40 #include <CoreAudio/CoreAudio.h> | 40 #include <CoreAudio/CoreAudio.h> |
41 | 41 |
42 #include "base/atomicops.h" | 42 #include "base/cancelable_callback.h" |
43 #include "base/memory/scoped_ptr.h" | 43 #include "base/memory/scoped_ptr.h" |
44 #include "base/synchronization/lock.h" | 44 #include "base/synchronization/lock.h" |
45 #include "media/audio/agc_audio_stream.h" | 45 #include "media/audio/agc_audio_stream.h" |
46 #include "media/audio/audio_io.h" | 46 #include "media/audio/audio_io.h" |
47 #include "media/audio/audio_parameters.h" | 47 #include "media/audio/audio_parameters.h" |
48 #include "media/base/seekable_buffer.h" | 48 #include "media/base/seekable_buffer.h" |
49 | 49 |
50 namespace media { | 50 namespace media { |
51 | 51 |
52 class AudioManagerMac; | 52 class AudioManagerMac; |
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155 scoped_ptr<media::SeekableBuffer> fifo_; | 155 scoped_ptr<media::SeekableBuffer> fifo_; |
156 | 156 |
157 // Intermediate storage of data from the FIFO before sending it to the | 157 // Intermediate storage of data from the FIFO before sending it to the |
158 // client using the OnData() callback. | 158 // client using the OnData() callback. |
159 scoped_refptr<media::DataBuffer> data_; | 159 scoped_refptr<media::DataBuffer> data_; |
160 | 160 |
161 // The client requests that the recorded data shall be delivered using | 161 // The client requests that the recorded data shall be delivered using |
162 // OnData() callbacks where each callback contains this amount of bytes. | 162 // OnData() callbacks where each callback contains this amount of bytes. |
163 int requested_size_bytes_; | 163 int requested_size_bytes_; |
164 | 164 |
| 165 // Used to defer Start() to workaround http://crbug.com/160920. |
| 166 base::CancelableClosure deferred_start_cb_; |
| 167 |
165 DISALLOW_COPY_AND_ASSIGN(AUAudioInputStream); | 168 DISALLOW_COPY_AND_ASSIGN(AUAudioInputStream); |
166 }; | 169 }; |
167 | 170 |
168 } // namespace media | 171 } // namespace media |
169 | 172 |
170 #endif // MEDIA_AUDIO_MAC_AUDIO_LOW_LATENCY_INPUT_MAC_H_ | 173 #endif // MEDIA_AUDIO_MAC_AUDIO_LOW_LATENCY_INPUT_MAC_H_ |
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