audio_manager_pulse.h revision d0247b1b59f9c528cb6df88b4f2b9afaf80d181e 
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();
20  virtual ~AudioManagerPulse();
21
22  static AudioManager* Create();
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,
41      const std::string& input_device_id) OVERRIDE;
42  virtual AudioInputStream* MakeLinearInputStream(
43      const AudioParameters& params, const std::string& device_id) OVERRIDE;
44  virtual AudioInputStream* MakeLowLatencyInputStream(
45      const AudioParameters& params, const std::string& device_id) OVERRIDE;
46
47 protected:
48  virtual AudioParameters GetPreferredOutputStreamParameters(
49      const std::string& output_device_id,
50      const AudioParameters& input_params) OVERRIDE;
51
52 private:
53  bool Init();
54  void DestroyPulse();
55
56  void GetAudioDeviceNames(bool input, media::AudioDeviceNames* device_names);
57
58  // Callback to get the devices' info like names, used by GetInputDevices().
59  static void InputDevicesInfoCallback(pa_context* context,
60                                       const pa_source_info* info,
61                                       int error, void* user_data);
62  static void OutputDevicesInfoCallback(pa_context* context,
63                                        const pa_sink_info* info,
64                                        int error, void* user_data);
65
66  // Callback to get the native sample rate of PulseAudio, used by
67  // GetNativeSampleRate().
68  static void SampleRateInfoCallback(pa_context* context,
69                                     const pa_server_info* info,
70                                     void* user_data);
71
72  // Called by MakeLinearOutputStream and MakeLowLatencyOutputStream.
73  AudioOutputStream* MakeOutputStream(const AudioParameters& params,
74                                      const std::string& input_device_id);
75
76  // Called by MakeLinearInputStream and MakeLowLatencyInputStream.
77  AudioInputStream* MakeInputStream(const AudioParameters& params,
78                                    const std::string& device_id);
79
80  // Gets the native sample rate of Pulse.
81  int GetNativeSampleRate();
82
83  pa_threaded_mainloop* input_mainloop_;
84  pa_context* input_context_;
85  AudioDeviceNames* devices_;
86  int native_input_sample_rate_;
87
88  DISALLOW_COPY_AND_ASSIGN(AudioManagerPulse);
89};
90
91}  // namespace media
92
93#endif  // MEDIA_AUDIO_PULSE_AUDIO_MANAGER_PULSE_H_
94