audio_manager_pulse.h revision 5d1f7b1de12d16ceb2c938c56701a3e8bfa558f7 
1// Copyright 2013 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef MEDIA_AUDIO_PULSE_AUDIO_MANAGER_PULSE_H_
6#define MEDIA_AUDIO_PULSE_AUDIO_MANAGER_PULSE_H_
7
8#include <pulse/pulseaudio.h>
9#include <string>
10
11#include "base/compiler_specific.h"
12#include "base/memory/ref_counted.h"
13#include "media/audio/audio_manager_base.h"
14
15namespace media {
16
17class MEDIA_EXPORT AudioManagerPulse : public AudioManagerBase {
18 public:
19  AudioManagerPulse(AudioLogFactory* audio_log_factory);
20  virtual ~AudioManagerPulse();
21
22  static AudioManager* Create(AudioLogFactory* audio_log_factory);
23
24  // Implementation of AudioManager.
25  virtual bool HasAudioOutputDevices() OVERRIDE;
26  virtual bool HasAudioInputDevices() OVERRIDE;
27  virtual void ShowAudioInputSettings() OVERRIDE;
28  virtual void GetAudioInputDeviceNames(
29      AudioDeviceNames* device_names) OVERRIDE;
30  virtual void GetAudioOutputDeviceNames(
31      AudioDeviceNames* device_names) OVERRIDE;
32  virtual AudioParameters GetInputStreamParameters(
33      const std::string& device_id) OVERRIDE;
34
35  // Implementation of AudioManagerBase.
36  virtual AudioOutputStream* MakeLinearOutputStream(
37      const AudioParameters& params) OVERRIDE;
38  virtual AudioOutputStream* MakeLowLatencyOutputStream(
39      const AudioParameters& params,
40      const std::string& device_id) OVERRIDE;
41  virtual AudioInputStream* MakeLinearInputStream(
42      const AudioParameters& params, const std::string& device_id) OVERRIDE;
43  virtual AudioInputStream* MakeLowLatencyInputStream(
44      const AudioParameters& params, const std::string& device_id) OVERRIDE;
45
46 protected:
47  virtual AudioParameters GetPreferredOutputStreamParameters(
48      const std::string& output_device_id,
49      const AudioParameters& input_params) OVERRIDE;
50
51 private:
52  bool Init();
53  void DestroyPulse();
54
55  void GetAudioDeviceNames(bool input, media::AudioDeviceNames* device_names);
56
57  // Callback to get the devices' info like names, used by GetInputDevices().
58  static void InputDevicesInfoCallback(pa_context* context,
59                                       const pa_source_info* info,
60                                       int error, void* user_data);
61  static void OutputDevicesInfoCallback(pa_context* context,
62                                        const pa_sink_info* info,
63                                        int error, void* user_data);
64
65  // Callback to get the native sample rate of PulseAudio, used by
66  // GetNativeSampleRate().
67  static void SampleRateInfoCallback(pa_context* context,
68                                     const pa_server_info* info,
69                                     void* user_data);
70
71  // Called by MakeLinearOutputStream and MakeLowLatencyOutputStream.
72  AudioOutputStream* MakeOutputStream(const AudioParameters& params,
73                                      const std::string& device_id);
74
75  // Called by MakeLinearInputStream and MakeLowLatencyInputStream.
76  AudioInputStream* MakeInputStream(const AudioParameters& params,
77                                    const std::string& device_id);
78
79  // Gets the native sample rate of Pulse.
80  int GetNativeSampleRate();
81
82  pa_threaded_mainloop* input_mainloop_;
83  pa_context* input_context_;
84  AudioDeviceNames* devices_;
85  int native_input_sample_rate_;
86
87  DISALLOW_COPY_AND_ASSIGN(AudioManagerPulse);
88};
89
90}  // namespace media
91
92#endif  // MEDIA_AUDIO_PULSE_AUDIO_MANAGER_PULSE_H_
93