audio_manager_alsa.h revision f2477e01787aa58f445919b809d89e252beef54f 
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_ALSA_AUDIO_MANAGER_ALSA_H_
6#define MEDIA_AUDIO_ALSA_AUDIO_MANAGER_ALSA_H_
7
8#include <string>
9#include "base/compiler_specific.h"
10#include "base/memory/ref_counted.h"
11#include "base/threading/thread.h"
12#include "media/audio/audio_manager_base.h"
13
14namespace media {
15
16class AlsaWrapper;
17
18class MEDIA_EXPORT AudioManagerAlsa : public AudioManagerBase {
19 public:
20  AudioManagerAlsa();
21
22  static void ShowLinuxAudioInputSettings();
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 ~AudioManagerAlsa();
49
50  virtual AudioParameters GetPreferredOutputStreamParameters(
51      const std::string& output_device_id,
52      const AudioParameters& input_params) OVERRIDE;
53
54 private:
55  enum StreamType {
56    kStreamPlayback = 0,
57    kStreamCapture,
58  };
59
60  // Gets a list of available ALSA devices.
61  void GetAlsaAudioDevices(StreamType type,
62                           media::AudioDeviceNames* device_names);
63
64  // Gets the ALSA devices' names and ids that support streams of the
65  // given type.
66  void GetAlsaDevicesInfo(StreamType type,
67                          void** hint,
68                          media::AudioDeviceNames* device_names);
69
70  // Checks if the specific ALSA device is available.
71  static bool IsAlsaDeviceAvailable(StreamType type,
72                                    const char* device_name);
73
74  static const char* UnwantedDeviceTypeWhenEnumerating(
75      StreamType wanted_type);
76
77  // Returns true if a device is present for the given stream type.
78  bool HasAnyAlsaAudioDevice(StreamType stream);
79
80  // Called by MakeLinearOutputStream and MakeLowLatencyOutputStream.
81  AudioOutputStream* MakeOutputStream(const AudioParameters& params);
82
83  // Called by MakeLinearInputStream and MakeLowLatencyInputStream.
84  AudioInputStream* MakeInputStream(const AudioParameters& params,
85                                    const std::string& device_id);
86
87  scoped_ptr<AlsaWrapper> wrapper_;
88
89  DISALLOW_COPY_AND_ASSIGN(AudioManagerAlsa);
90};
91
92}  // namespace media
93
94#endif  // MEDIA_AUDIO_ALSA_AUDIO_MANAGER_ALSA_H_
95