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1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2013 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_BASE_AUDIO_HARDWARE_CONFIG_H_ | 5 #ifndef MEDIA_BASE_AUDIO_HARDWARE_CONFIG_H_ |
6 #define MEDIA_BASE_AUDIO_HARDWARE_CONFIG_H_ | 6 #define MEDIA_BASE_AUDIO_HARDWARE_CONFIG_H_ |
7 | 7 |
8 #include "base/compiler_specific.h" | 8 #include "base/compiler_specific.h" |
9 #include "base/macros.h" | 9 #include "base/macros.h" |
10 #include "base/synchronization/lock.h" | 10 #include "base/synchronization/lock.h" |
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35 media::AudioParameters GetInputConfig() const; | 35 media::AudioParameters GetInputConfig() const; |
36 media::AudioParameters GetOutputConfig() const; | 36 media::AudioParameters GetOutputConfig() const; |
37 | 37 |
38 // Allows callers to update the cached values for either input or output. The | 38 // Allows callers to update the cached values for either input or output. The |
39 // values are paired under the assumption that these values will only be set | 39 // values are paired under the assumption that these values will only be set |
40 // after an input or output device change respectively. Safe to call from | 40 // after an input or output device change respectively. Safe to call from |
41 // any thread. | 41 // any thread. |
42 void UpdateInputConfig(const media::AudioParameters& input_params); | 42 void UpdateInputConfig(const media::AudioParameters& input_params); |
43 void UpdateOutputConfig(const media::AudioParameters& output_params); | 43 void UpdateOutputConfig(const media::AudioParameters& output_params); |
44 | 44 |
45 // For clients which don't need low latency, a larger buffer size should be | |
46 // used to save power and CPU resources. | |
47 int GetHighLatencyBufferSize() const; | |
48 | |
49 // |buffer_size| should be set to 0 if a client has no preference. | |
50 static int GetHighLatencyBufferSize(int sample_rate, int buffer_size); | |
51 | |
52 private: | 45 private: |
53 // Cached values; access is protected by |config_lock_|. | 46 // Cached values; access is protected by |config_lock_|. |
54 mutable base::Lock config_lock_; | 47 mutable base::Lock config_lock_; |
55 media::AudioParameters input_params_; | 48 media::AudioParameters input_params_; |
56 media::AudioParameters output_params_; | 49 media::AudioParameters output_params_; |
57 | 50 |
58 DISALLOW_COPY_AND_ASSIGN(AudioHardwareConfig); | 51 DISALLOW_COPY_AND_ASSIGN(AudioHardwareConfig); |
59 }; | 52 }; |
60 | 53 |
61 } // namespace media | 54 } // namespace media |
62 | 55 |
63 #endif // MEDIA_BASE_AUDIO_HARDWARE_CONFIG_H_ | 56 #endif // MEDIA_BASE_AUDIO_HARDWARE_CONFIG_H_ |
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