audio_manager_pulse.h revision 2a99a7e74a7f215066514fe81d2bfa6639d9eddd 
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) OVERRIDE;
38  virtual AudioInputStream* MakeLinearInputStream(
39      const AudioParameters& params, const std::string& device_id) OVERRIDE;
40  virtual AudioInputStream* MakeLowLatencyInputStream(
41      const AudioParameters& params, const std::string& device_id) OVERRIDE;
42
43 protected:
44  virtual AudioParameters GetPreferredOutputStreamParameters(
45      const AudioParameters& input_params) OVERRIDE;
46
47 private:
48  bool Init();
49  void DestroyPulse();
50
51  // Callback to get the devices' info like names, used by GetInputDevices().
52  static void DevicesInfoCallback(pa_context* context,
53                                  const pa_source_info* info,
54                                  int error, void* user_data);
55
56  // Callback to get the native sample rate of PulseAudio, used by
57  // GetNativeSampleRate().
58  static void SampleRateInfoCallback(pa_context* context,
59                                     const pa_server_info* info,
60                                     void* user_data);
61
62  // Called by MakeLinearOutputStream and MakeLowLatencyOutputStream.
63  AudioOutputStream* MakeOutputStream(const AudioParameters& params);
64
65  // Called by MakeLinearInputStream and MakeLowLatencyInputStream.
66  AudioInputStream* MakeInputStream(const AudioParameters& params,
67                                    const std::string& device_id);
68
69  // Gets the native sample rate of Pulse.
70  int GetNativeSampleRate();
71
72  pa_threaded_mainloop* input_mainloop_;
73  pa_context* input_context_;
74  AudioDeviceNames* devices_;
75  int native_input_sample_rate_;
76
77  DISALLOW_COPY_AND_ASSIGN(AudioManagerPulse);
78};
79
80}  // namespace media
81
82#endif  // MEDIA_AUDIO_PULSE_AUDIO_MANAGER_PULSE_H_
83