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(AudioLogFactory* audio_log_factory);
  22
  23   // Implementation of AudioManager.
  24   bool HasAudioOutputDevices() override;
  25   bool HasAudioInputDevices() override;
  26   base::string16 GetAudioInputDeviceModel() override;
  27   void ShowAudioInputSettings() override;
  28   void GetAudioInputDeviceNames(AudioDeviceNames* device_names) override;
  29   void GetAudioOutputDeviceNames(AudioDeviceNames* device_names) override;
  30   AudioParameters GetInputStreamParameters(
  31       const std::string& device_id) override;
  32   std::string GetAssociatedOutputDeviceID(
  33       const std::string& input_device_id) override;
  34
  35   // Implementation of AudioManagerBase.
  36   AudioOutputStream* MakeLinearOutputStream(
  37       const AudioParameters& params) override;
  38   AudioOutputStream* MakeLowLatencyOutputStream(
  39       const AudioParameters& params,
  40       const std::string& device_id) override;
  41   AudioInputStream* MakeLinearInputStream(
  42       const AudioParameters& params,
  43       const std::string& device_id) override;
  44   AudioInputStream* MakeLowLatencyInputStream(
  45       const AudioParameters& params,
  46       const std::string& device_id) override;
  47   std::string GetDefaultOutputDeviceID() override;
  48
  49  protected:
  50   ~AudioManagerWin() override;
  51
  52   AudioParameters GetPreferredOutputStreamParameters(
  53       const std::string& output_device_id,
  54       const AudioParameters& input_params) override;
  55
  56  private:
  57   enum EnumerationType {
  58     kMMDeviceEnumeration,
  59     kWaveEnumeration,
  60   };
  61
  62   // Allow unit test to modify the utilized enumeration API.
  63   friend class AudioManagerTest;
  64
  65   EnumerationType enumeration_type_;
  66   EnumerationType enumeration_type() { return enumeration_type_; }
  67   void SetEnumerationType(EnumerationType type) {
  68     enumeration_type_ = type;
  69   }
  70
  71   inline bool core_audio_supported() const {
  72     return enumeration_type_ == kMMDeviceEnumeration;
  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 performing expensive initialization tasks on the audio
  85   // thread instead of on the UI thread which AudioManager is constructed on.
  86   void InitializeOnAudioThread();
  87   void ShutdownOnAudioThread();
  88
  89   void GetAudioDeviceNamesImpl(bool input, AudioDeviceNames* device_names);
  90
  91   // Listen for output device changes.
  92   scoped_ptr<AudioDeviceListenerWin> output_device_listener_;
  93
  94   DISALLOW_COPY_AND_ASSIGN(AudioManagerWin);
  95 };
  96
  97 }  // namespace media
  98
  99 #endif  // MEDIA_AUDIO_WIN_AUDIO_MANAGER_WIN_H_