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(media::AudioDeviceNames* device_names)
29      OVERRIDE;
30  virtual AudioParameters GetInputStreamParameters(
31      const std::string& device_id) OVERRIDE;
32
33  // Implementation of AudioManagerBase.
34  virtual AudioOutputStream* MakeLinearOutputStream(
35      const AudioParameters& params) OVERRIDE;
36  virtual AudioOutputStream* MakeLowLatencyOutputStream(
37      const AudioParameters& params,
38      const std::string& input_device_id) OVERRIDE;
39  virtual AudioInputStream* MakeLinearInputStream(
40      const AudioParameters& params, const std::string& device_id) OVERRIDE;
41  virtual AudioInputStream* MakeLowLatencyInputStream(
42      const AudioParameters& params, const std::string& device_id) OVERRIDE;
43
44 protected:
45  virtual AudioParameters GetPreferredOutputStreamParameters(
46      const AudioParameters& input_params) OVERRIDE;
47
48 private:
49  bool Init();
50  void DestroyPulse();
51
52  // Callback to get the devices' info like names, used by GetInputDevices().
53  static void InputDevicesInfoCallback(pa_context* context,
54                                       const pa_source_info* info,
55                                       int error, void* user_data);
56  static void OutputDevicesInfoCallback(pa_context* context,
57                                        const pa_sink_info* info,
58                                        int error, void* user_data);
59
60  // Callback to get the native sample rate of PulseAudio, used by
61  // GetNativeSampleRate().
62  static void SampleRateInfoCallback(pa_context* context,
63                                     const pa_server_info* info,
64                                     void* user_data);
65
66  // Called by MakeLinearOutputStream and MakeLowLatencyOutputStream.
67  AudioOutputStream* MakeOutputStream(const AudioParameters& params,
68                                      const std::string& input_device_id);
69
70  // Called by MakeLinearInputStream and MakeLowLatencyInputStream.
71  AudioInputStream* MakeInputStream(const AudioParameters& params,
72                                    const std::string& device_id);
73
74  // Gets the native sample rate of Pulse.
75  int GetNativeSampleRate();
76
77  pa_threaded_mainloop* input_mainloop_;
78  pa_context* input_context_;
79  AudioDeviceNames* devices_;
80  int native_input_sample_rate_;
81
82  DISALLOW_COPY_AND_ASSIGN(AudioManagerPulse);
83};
84
85}  // namespace media
86
87#endif  // MEDIA_AUDIO_PULSE_AUDIO_MANAGER_PULSE_H_
88