audio_manager_win.h revision 58537e28ecd584eab876aee8be7156509866d23a 
1// Copyright (c) 2012 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_WIN_AUDIO_MANAGER_WIN_H_
6#define MEDIA_AUDIO_WIN_AUDIO_MANAGER_WIN_H_
7
8#include <string>
9
10#include "media/audio/audio_manager_base.h"
11
12namespace media {
13
14class AudioDeviceListenerWin;
15
16// Windows implementation of the AudioManager singleton. This class is internal
17// to the audio output and only internal users can call methods not exposed by
18// the AudioManager class.
19class MEDIA_EXPORT AudioManagerWin : public AudioManagerBase {
20 public:
21  AudioManagerWin();
22
23  // Implementation of AudioManager.
24  virtual bool HasAudioOutputDevices() OVERRIDE;
25  virtual bool HasAudioInputDevices() OVERRIDE;
26  virtual string16 GetAudioInputDeviceModel() OVERRIDE;
27  virtual void ShowAudioInputSettings() OVERRIDE;
28  virtual void GetAudioInputDeviceNames(AudioDeviceNames* device_names)
29       OVERRIDE;
30  virtual void GetAudioOutputDeviceNames(AudioDeviceNames* device_names)
31      OVERRIDE;
32  virtual AudioParameters GetInputStreamParameters(
33      const std::string& device_id) OVERRIDE;
34  virtual std::string GetAssociatedOutputDeviceID(
35      const std::string& input_device_id) OVERRIDE;
36
37  // Implementation of AudioManagerBase.
38  virtual AudioOutputStream* MakeLinearOutputStream(
39      const AudioParameters& params) OVERRIDE;
40  virtual AudioOutputStream* MakeLowLatencyOutputStream(
41      const AudioParameters& params,
42      const std::string& device_id,
43      const std::string& input_device_id) OVERRIDE;
44  virtual AudioInputStream* MakeLinearInputStream(
45      const AudioParameters& params, const std::string& device_id) OVERRIDE;
46  virtual AudioInputStream* MakeLowLatencyInputStream(
47      const AudioParameters& params, const std::string& device_id) OVERRIDE;
48  virtual std::string GetDefaultOutputDeviceID() OVERRIDE;
49
50 protected:
51  virtual ~AudioManagerWin();
52
53  virtual AudioParameters GetPreferredOutputStreamParameters(
54      const std::string& output_device_id,
55      const AudioParameters& input_params) OVERRIDE;
56
57 private:
58  enum EnumerationType {
59    kUninitializedEnumeration = 0,
60    kMMDeviceEnumeration,
61    kWaveEnumeration,
62  };
63
64  // Allow unit test to modify the utilized enumeration API.
65  // TODO(joi): Collapse these tests into one.
66  friend class AudioManagerTest;
67  friend class AudioInputDeviceTest;
68
69  EnumerationType enumeration_type_;
70  EnumerationType enumeration_type() { return enumeration_type_; }
71  void SetEnumerationType(EnumerationType type) {
72    enumeration_type_ = type;
73  }
74
75  // Returns a PCMWaveInAudioInputStream instance or NULL on failure.
76  // This method converts MMDevice-style device ID to WaveIn-style device ID if
77  // necessary.
78  // (Please see device_enumeration_win.h for more info about the two kinds of
79  // device IDs.)
80  AudioInputStream* CreatePCMWaveInAudioInputStream(
81      const AudioParameters& params,
82      const std::string& device_id);
83
84  // Helper methods for constructing AudioDeviceListenerWin on the audio thread.
85  void CreateDeviceListener();
86  void DestroyDeviceListener();
87
88  void GetAudioDeviceNamesImpl(bool input, AudioDeviceNames* device_names);
89
90  // Listen for output device changes.
91  scoped_ptr<AudioDeviceListenerWin> output_device_listener_;
92
93  DISALLOW_COPY_AND_ASSIGN(AudioManagerWin);
94};
95
96}  // namespace media
97
98#endif  // MEDIA_AUDIO_WIN_AUDIO_MANAGER_WIN_H_
99