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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 AudioOutputStream for Windows using Windows Core Audio | 5 // Implementation of AudioOutputStream for Windows using Windows Core Audio |
6 // WASAPI for low latency rendering. | 6 // WASAPI for low latency rendering. |
7 // | 7 // |
8 // Overview of operation and performance: | 8 // Overview of operation and performance: |
9 // | 9 // |
10 // - An object of WASAPIAudioOutputStream is created by the AudioManager | 10 // - An object of WASAPIAudioOutputStream is created by the AudioManager |
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88 // o ~3.3333ms @ 48kHz <=> 160 audio frames per buffer. | 88 // o ~3.3333ms @ 48kHz <=> 160 audio frames per buffer. |
89 // o ~3.6281ms @ 44.1kHz <=> 160 audio frames per buffer. | 89 // o ~3.6281ms @ 44.1kHz <=> 160 audio frames per buffer. |
90 // - See http://msdn.microsoft.com/en-us/library/windows/desktop/dd370844(v=vs.8
5).aspx | 90 // - See http://msdn.microsoft.com/en-us/library/windows/desktop/dd370844(v=vs.8
5).aspx |
91 // for more details. | 91 // for more details. |
92 | 92 |
93 #ifndef MEDIA_AUDIO_WIN_AUDIO_LOW_LATENCY_OUTPUT_WIN_H_ | 93 #ifndef MEDIA_AUDIO_WIN_AUDIO_LOW_LATENCY_OUTPUT_WIN_H_ |
94 #define MEDIA_AUDIO_WIN_AUDIO_LOW_LATENCY_OUTPUT_WIN_H_ | 94 #define MEDIA_AUDIO_WIN_AUDIO_LOW_LATENCY_OUTPUT_WIN_H_ |
95 | 95 |
96 #include <Audioclient.h> | 96 #include <Audioclient.h> |
97 #include <MMDeviceAPI.h> | 97 #include <MMDeviceAPI.h> |
| 98 #include <stddef.h> |
| 99 #include <stdint.h> |
98 | 100 |
99 #include <string> | 101 #include <string> |
100 | 102 |
101 #include "base/compiler_specific.h" | 103 #include "base/compiler_specific.h" |
102 #include "base/macros.h" | 104 #include "base/macros.h" |
103 #include "base/memory/scoped_ptr.h" | 105 #include "base/memory/scoped_ptr.h" |
104 #include "base/threading/platform_thread.h" | 106 #include "base/threading/platform_thread.h" |
105 #include "base/threading/simple_thread.h" | 107 #include "base/threading/simple_thread.h" |
106 #include "base/win/scoped_co_mem.h" | 108 #include "base/win/scoped_co_mem.h" |
107 #include "base/win/scoped_com_initializer.h" | 109 #include "base/win/scoped_com_initializer.h" |
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241 scoped_ptr<AudioBus> audio_bus_; | 243 scoped_ptr<AudioBus> audio_bus_; |
242 | 244 |
243 base::win::ScopedComPtr<IAudioClock> audio_clock_; | 245 base::win::ScopedComPtr<IAudioClock> audio_clock_; |
244 | 246 |
245 DISALLOW_COPY_AND_ASSIGN(WASAPIAudioOutputStream); | 247 DISALLOW_COPY_AND_ASSIGN(WASAPIAudioOutputStream); |
246 }; | 248 }; |
247 | 249 |
248 } // namespace media | 250 } // namespace media |
249 | 251 |
250 #endif // MEDIA_AUDIO_WIN_AUDIO_LOW_LATENCY_OUTPUT_WIN_H_ | 252 #endif // MEDIA_AUDIO_WIN_AUDIO_LOW_LATENCY_OUTPUT_WIN_H_ |
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