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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 CHROME_BROWSER_CHROMEOS_AUDIO_AUDIO_MIXER_ALSA_H_ | 5 #ifndef CHROME_BROWSER_CHROMEOS_AUDIO_AUDIO_MIXER_ALSA_H_ |
6 #define CHROME_BROWSER_CHROMEOS_AUDIO_AUDIO_MIXER_ALSA_H_ | 6 #define CHROME_BROWSER_CHROMEOS_AUDIO_AUDIO_MIXER_ALSA_H_ |
7 | 7 |
8 #include <string> | 8 #include <string> |
9 | 9 |
10 #include "base/basictypes.h" | 10 #include "base/basictypes.h" |
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21 namespace chromeos { | 21 namespace chromeos { |
22 | 22 |
23 // Simple wrapper around ALSA's mixer functions. | 23 // Simple wrapper around ALSA's mixer functions. |
24 // Interaction with ALSA takes place on a background thread. | 24 // Interaction with ALSA takes place on a background thread. |
25 class AudioMixerAlsa : public AudioMixer { | 25 class AudioMixerAlsa : public AudioMixer { |
26 public: | 26 public: |
27 AudioMixerAlsa(); | 27 AudioMixerAlsa(); |
28 virtual ~AudioMixerAlsa(); | 28 virtual ~AudioMixerAlsa(); |
29 | 29 |
30 // AudioMixer implementation. | 30 // AudioMixer implementation. |
31 virtual void Init() OVERRIDE; | 31 virtual void Init(const base::Closure& on_connected) OVERRIDE; |
32 virtual double GetVolumePercent() OVERRIDE; | 32 virtual double GetVolumePercent() OVERRIDE; |
33 virtual void SetVolumePercent(double percent) OVERRIDE; | 33 virtual void SetVolumePercent(double percent) OVERRIDE; |
34 virtual bool IsMuted() OVERRIDE; | 34 virtual bool IsMuted() OVERRIDE; |
35 virtual void SetMuted(bool mute) OVERRIDE; | 35 virtual void SetMuted(bool mute) OVERRIDE; |
36 virtual bool IsMuteLocked() OVERRIDE; | 36 virtual bool IsMuteLocked() OVERRIDE; |
37 virtual void SetMuteLocked(bool locked) OVERRIDE; | 37 virtual void SetMuteLocked(bool locked) OVERRIDE; |
38 virtual bool IsCaptureMuted() OVERRIDE; | 38 virtual bool IsCaptureMuted() OVERRIDE; |
39 virtual void SetCaptureMuted(bool mute) OVERRIDE; | 39 virtual void SetCaptureMuted(bool mute) OVERRIDE; |
40 virtual bool IsCaptureMuteLocked() OVERRIDE; | 40 virtual bool IsCaptureMuteLocked() OVERRIDE; |
41 virtual void SetCaptureMuteLocked(bool locked) OVERRIDE; | 41 virtual void SetCaptureMuteLocked(bool locked) OVERRIDE; |
42 | 42 |
43 private: | 43 private: |
44 // Tries to connect to ALSA. On failure, posts a delayed Connect() task to | 44 // Tries to connect to ALSA. On failure, posts a delayed Connect() task to |
45 // try again. | 45 // try again. |
46 void Connect(); | 46 void Connect(const base::Closure& on_connected); |
47 | 47 |
48 // Helper method called by Connect(). On success, initializes | 48 // Helper method called by Connect(). On success, initializes |
49 // |min_volume_db_|, |max_volume_db_|, |alsa_mixer_|, and |element_*| and | 49 // |min_volume_db_|, |max_volume_db_|, |alsa_mixer_|, and |element_*| and |
50 // returns true. | 50 // returns true. |
51 bool ConnectInternal(); | 51 bool ConnectInternal(const base::Closure& on_connected); |
52 | 52 |
53 // Disconnects from ALSA if currently connected and signals | 53 // Disconnects from ALSA if currently connected and signals |
54 // |disconnected_event_|. | 54 // |disconnected_event_|. |
55 void Disconnect(); | 55 void Disconnect(); |
56 | 56 |
57 // Updates |alsa_mixer_| for current values of |volume_db_| and |is_muted_|. | 57 // Updates |alsa_mixer_| for current values of |volume_db_| and |is_muted_|. |
58 // No-op if not connected. | 58 // No-op if not connected. |
59 void ApplyState(); | 59 void ApplyState(); |
60 | 60 |
61 // Finds the element named |element_name|. Returns NULL on failure. | 61 // Finds the element named |element_name|. Returns NULL on failure. |
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142 // Number of times that we've attempted to connect to ALSA. Just used to keep | 142 // Number of times that we've attempted to connect to ALSA. Just used to keep |
143 // us from spamming the logs. | 143 // us from spamming the logs. |
144 int num_connection_attempts_; | 144 int num_connection_attempts_; |
145 | 145 |
146 DISALLOW_COPY_AND_ASSIGN(AudioMixerAlsa); | 146 DISALLOW_COPY_AND_ASSIGN(AudioMixerAlsa); |
147 }; | 147 }; |
148 | 148 |
149 } // namespace chromeos | 149 } // namespace chromeos |
150 | 150 |
151 #endif // CHROME_BROWSER_CHROMEOS_AUDIO_AUDIO_MIXER_ALSA_H_ | 151 #endif // CHROME_BROWSER_CHROMEOS_AUDIO_AUDIO_MIXER_ALSA_H_ |
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