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1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2010 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 CHROME_BROWSER_CHROMEOS_AUDIO_MIXER_ALSA_H_ | 5 #ifndef CHROME_BROWSER_CHROMEOS_AUDIO_MIXER_ALSA_H_ |
6 #define CHROME_BROWSER_CHROMEOS_AUDIO_MIXER_ALSA_H_ | 6 #define CHROME_BROWSER_CHROMEOS_AUDIO_MIXER_ALSA_H_ |
7 #pragma once | 7 #pragma once |
8 | 8 |
9 #include "base/basictypes.h" | 9 #include "base/basictypes.h" |
10 #include "base/callback.h" | 10 #include "base/callback.h" |
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68 // so actual_vol will contain the true volume that was set. This information | 68 // so actual_vol will contain the true volume that was set. This information |
69 // can be used to further refine the volume by adjust a different mixer | 69 // can be used to further refine the volume by adjust a different mixer |
70 // element. The rounding_bias is added in before rounding to the nearest | 70 // element. The rounding_bias is added in before rounding to the nearest |
71 // volume step (use 0.5 to round to nearest). | 71 // volume step (use 0.5 to round to nearest). |
72 bool SetElementVolume_Locked(_snd_mixer_elem* elem, | 72 bool SetElementVolume_Locked(_snd_mixer_elem* elem, |
73 double new_vol, | 73 double new_vol, |
74 double* actual_vol, | 74 double* actual_vol, |
75 double rounding_bias); | 75 double rounding_bias); |
76 | 76 |
77 // In ALSA, the mixer element's 'switch' is turned off to mute. | 77 // In ALSA, the mixer element's 'switch' is turned off to mute. |
| 78 // GetElementMuted_Locked() returns false on failure. |
78 bool GetElementMuted_Locked(_snd_mixer_elem* elem) const; | 79 bool GetElementMuted_Locked(_snd_mixer_elem* elem) const; |
79 void SetElementMuted_Locked(_snd_mixer_elem* elem, bool mute); | 80 void SetElementMuted_Locked(_snd_mixer_elem* elem, bool mute); |
80 | 81 |
81 // Volume range limits are computed once during InitializeAlsaMixer. | 82 // Volume range limits are computed once during InitializeAlsaMixer. |
82 double min_volume_; | 83 double min_volume_; |
83 double max_volume_; | 84 double max_volume_; |
84 | 85 |
85 // Muting is done by setting volume to minimum, so we must save the original. | 86 // Muting is done by setting volume to minimum, so we must save the original. |
86 // This is the only state information kept in this object. In some cases, | 87 // This is the only state information kept in this object. In some cases, |
87 // ALSA can report it has a volume switch and we can turn it off, but it has | 88 // ALSA can report it has a volume switch and we can turn it off, but it has |
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103 | 104 |
104 DISALLOW_COPY_AND_ASSIGN(AudioMixerAlsa); | 105 DISALLOW_COPY_AND_ASSIGN(AudioMixerAlsa); |
105 }; | 106 }; |
106 | 107 |
107 } // namespace chromeos | 108 } // namespace chromeos |
108 | 109 |
109 DISABLE_RUNNABLE_METHOD_REFCOUNT(chromeos::AudioMixerAlsa); | 110 DISABLE_RUNNABLE_METHOD_REFCOUNT(chromeos::AudioMixerAlsa); |
110 | 111 |
111 #endif // CHROME_BROWSER_CHROMEOS_AUDIO_MIXER_ALSA_H_ | 112 #endif // CHROME_BROWSER_CHROMEOS_AUDIO_MIXER_ALSA_H_ |
112 | 113 |
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