media/audio/win/audio_manager_win.h

   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
  12 namespace media {
  13
  14 class 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.
  19 class 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(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 ~AudioManagerWin();
  46
  47   virtual AudioParameters GetPreferredOutputStreamParameters(
  48       const AudioParameters& input_params) OVERRIDE;
  49
  50  private:
  51   enum EnumerationType {
  52     kUninitializedEnumeration = 0,
  53     kMMDeviceEnumeration,
  54     kWaveEnumeration,
  55   };
  56
  57   // Allow unit test to modify the utilized enumeration API.
  58   friend class AudioInputDeviceTest;
  59
  60   EnumerationType enumeration_type_;
  61   EnumerationType enumeration_type() { return enumeration_type_; }
  62   void SetEnumerationType(EnumerationType type) {
  63     enumeration_type_ = type;
  64   }
  65
  66   // Returns a PCMWaveInAudioInputStream instance or NULL on failure.
  67   // This method converts MMDevice-style device ID to WaveIn-style device ID if
  68   // necessary.
  69   // (Please see device_enumeration_win.h for more info about the two kinds of
  70   // device IDs.)
  71   AudioInputStream* CreatePCMWaveInAudioInputStream(
  72       const AudioParameters& params,
  73       const std::string& device_id);
  74
  75   // Helper methods for constructing AudioDeviceListenerWin on the audio thread.
  76   void CreateDeviceListener();
  77   void DestroyDeviceListener();
  78
  79   // Listen for output device changes.
  80   scoped_ptr<AudioDeviceListenerWin> output_device_listener_;
  81
  82   DISALLOW_COPY_AND_ASSIGN(AudioManagerWin);
  83 };
  84
  85 }  // namespace media
  86
  87 #endif  // MEDIA_AUDIO_WIN_AUDIO_MANAGER_WIN_H_