1 /*
2  *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 #ifndef AUDIO_DEVICE_AUDIO_MIXER_MANAGER_ALSA_LINUX_H_
12 #define AUDIO_DEVICE_AUDIO_MIXER_MANAGER_ALSA_LINUX_H_
13 
14 #include <alsa/asoundlib.h>
15 
16 #include "modules/audio_device/include/audio_device.h"
17 #include "modules/audio_device/linux/alsasymboltable_linux.h"
18 #include "rtc_base/critical_section.h"
19 
20 namespace webrtc {
21 
22 class AudioMixerManagerLinuxALSA {
23  public:
24   int32_t OpenSpeaker(char* deviceName);
25   int32_t OpenMicrophone(char* deviceName);
26   int32_t SetSpeakerVolume(uint32_t volume);
27   int32_t SpeakerVolume(uint32_t& volume) const;
28   int32_t MaxSpeakerVolume(uint32_t& maxVolume) const;
29   int32_t MinSpeakerVolume(uint32_t& minVolume) const;
30   int32_t SpeakerVolumeIsAvailable(bool& available);
31   int32_t SpeakerMuteIsAvailable(bool& available);
32   int32_t SetSpeakerMute(bool enable);
33   int32_t SpeakerMute(bool& enabled) const;
34   int32_t MicrophoneMuteIsAvailable(bool& available);
35   int32_t SetMicrophoneMute(bool enable);
36   int32_t MicrophoneMute(bool& enabled) const;
37   int32_t MicrophoneVolumeIsAvailable(bool& available);
38   int32_t SetMicrophoneVolume(uint32_t volume);
39   int32_t MicrophoneVolume(uint32_t& volume) const;
40   int32_t MaxMicrophoneVolume(uint32_t& maxVolume) const;
41   int32_t MinMicrophoneVolume(uint32_t& minVolume) const;
42   int32_t Close();
43   int32_t CloseSpeaker();
44   int32_t CloseMicrophone();
45   bool SpeakerIsInitialized() const;
46   bool MicrophoneIsInitialized() const;
47 
48  public:
49   AudioMixerManagerLinuxALSA();
50   ~AudioMixerManagerLinuxALSA();
51 
52  private:
53   int32_t LoadMicMixerElement() const;
54   int32_t LoadSpeakerMixerElement() const;
55   void GetControlName(char* controlName, char* deviceName) const;
56 
57  private:
58   rtc::CriticalSection _critSect;
59   mutable snd_mixer_t* _outputMixerHandle;
60   char _outputMixerStr[kAdmMaxDeviceNameSize];
61   mutable snd_mixer_t* _inputMixerHandle;
62   char _inputMixerStr[kAdmMaxDeviceNameSize];
63   mutable snd_mixer_elem_t* _outputMixerElement;
64   mutable snd_mixer_elem_t* _inputMixerElement;
65 };
66 
67 }  // namespace webrtc
68 
69 #endif  // MODULES_AUDIO_DEVICE_MAIN_SOURCE_LINUX_AUDIO_MIXER_MANAGER_ALSA_LINUX_H_
70