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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 CONTENT_RENDERER_MEDIA_AUDIO_HARDWARE_H_ | 5 #ifndef CONTENT_RENDERER_MEDIA_AUDIO_HARDWARE_H_ |
6 #define CONTENT_RENDERER_MEDIA_AUDIO_HARDWARE_H_ | 6 #define CONTENT_RENDERER_MEDIA_AUDIO_HARDWARE_H_ |
7 #pragma once | 7 #pragma once |
8 | 8 |
9 #include "base/basictypes.h" | 9 #include "base/basictypes.h" |
10 #include "content/common/content_export.h" | 10 #include "content/common/content_export.h" |
11 #include "media/base/channel_layout.h" | |
11 | 12 |
12 // Contains static methods to query hardware properties from the browser | 13 // Contains static methods to query hardware properties from the browser |
13 // process. Values are cached to avoid unnecessary round trips, but the cache | 14 // process. Values are cached to avoid unnecessary round trips, but the cache |
14 // can be cleared if needed (currently only used by tests). | 15 // can be cleared if needed (currently only used by tests). |
15 namespace audio_hardware { | 16 namespace audio_hardware { |
16 | 17 |
17 // Fetch the sample rate of the default audio output end point device. | 18 // Fetch the sample rate of the default audio output end point device. |
18 // Must be called from RenderThreadImpl::current(). | 19 // Must be called from RenderThreadImpl::current(). |
19 CONTENT_EXPORT double GetOutputSampleRate(); | 20 CONTENT_EXPORT double GetOutputSampleRate(); |
20 | 21 |
21 // Fetch the sample rate of the default audio input end point device. | 22 // Fetch the sample rate of the default audio input end point device. |
22 // Must be called from RenderThreadImpl::current(). | 23 // Must be called from RenderThreadImpl::current(). |
23 CONTENT_EXPORT double GetInputSampleRate(); | 24 CONTENT_EXPORT double GetInputSampleRate(); |
24 | 25 |
25 // Fetch the buffer size we use for the default output device. | 26 // Fetch the buffer size we use for the default output device. |
26 // Must be called from RenderThreadImpl::current(). | 27 // Must be called from RenderThreadImpl::current(). |
27 // Must be used in conjunction with AUDIO_PCM_LOW_LATENCY. | 28 // Must be used in conjunction with AUDIO_PCM_LOW_LATENCY. |
28 CONTENT_EXPORT size_t GetOutputBufferSize(); | 29 CONTENT_EXPORT size_t GetOutputBufferSize(); |
29 | 30 |
30 // Computes a buffer size based on the given |sample_rate|. Must be used in | 31 // Computes a buffer size based on the given |sample_rate|. Must be used in |
31 // conjunction with AUDIO_PCM_LINEAR. | 32 // conjunction with AUDIO_PCM_LINEAR. |
32 CONTENT_EXPORT size_t GetHighLatencyOutputBufferSize(int sample_rate); | 33 CONTENT_EXPORT size_t GetHighLatencyOutputBufferSize(int sample_rate); |
33 | 34 |
34 // Fetch the number of audio channels for the default input device. | 35 // Fetch the number of audio channels for the default input device. |
35 // Must be called from RenderThreadImpl::current(). | 36 // Must be called from RenderThreadImpl::current(). |
scherkus (not reviewing)
2012/03/09 21:48:59
update docs
vrk (LEFT CHROMIUM)
2012/03/16 18:30:41
Done.
| |
36 CONTENT_EXPORT uint32 GetInputChannelCount(); | 37 CONTENT_EXPORT ChannelLayout GetInputChannelLayout(); |
37 | 38 |
38 // Forces the next call to any of the Get functions to query the hardware | 39 // Forces the next call to any of the Get functions to query the hardware |
39 // and repopulate the cache. | 40 // and repopulate the cache. |
40 CONTENT_EXPORT void ResetCache(); | 41 CONTENT_EXPORT void ResetCache(); |
41 | 42 |
42 } // namespace audio_hardware | 43 } // namespace audio_hardware |
43 | 44 |
44 #endif // CONTENT_RENDERER_MEDIA_AUDIO_HARDWARE_H_ | 45 #endif // CONTENT_RENDERER_MEDIA_AUDIO_HARDWARE_H_ |
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