text: // Copyright (c) 2012 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #ifndef MEDIA_AUDIO_MAC_AUDIO_MANAGER_MAC_H_
  #define MEDIA_AUDIO_MAC_AUDIO_MANAGER_MAC_H_
  
  #include "base/basictypes.h"
  #include "base/compiler_specific.h"
  #include "base/message_loop_proxy.h"
  #include "media/audio/audio_manager_base.h"
  #include "media/audio/mac/audio_device_listener_mac.h"
  
  namespace media {
  
  // Mac OS X implementation of the AudioManager singleton. This class is internal
  // to the audio output and only internal users can call methods not exposed by
  // the AudioManager class.
  class MEDIA_EXPORT AudioManagerMac : public AudioManagerBase {
   public:
    AudioManagerMac();
  
    // Implementation of AudioManager.
    virtual bool HasAudioOutputDevices() OVERRIDE;
    virtual bool HasAudioInputDevices() OVERRIDE;
    virtual void GetAudioInputDeviceNames(media::AudioDeviceNames* device_names)
        OVERRIDE;
  
    // Implementation of AudioManagerBase.
    virtual AudioOutputStream* MakeLinearOutputStream(
        const AudioParameters& params) OVERRIDE;
    virtual AudioOutputStream* MakeLowLatencyOutputStream(
        const AudioParameters& params) OVERRIDE;
    virtual AudioInputStream* MakeLinearInputStream(
        const AudioParameters& params, const std::string& device_id) OVERRIDE;
    virtual AudioInputStream* MakeLowLatencyInputStream(
        const AudioParameters& params, const std::string& device_id) OVERRIDE;
    virtual AudioParameters GetPreferredLowLatencyOutputStreamParameters(
        const AudioParameters& input_params) OVERRIDE;
  
   protected:
    virtual ~AudioManagerMac();
  
   private:
    // Helper methods for constructing AudioDeviceListenerMac on the audio thread.
    void CreateDeviceListener();
    void DestroyDeviceListener();
    void DelayedDeviceChange();
  
    scoped_ptr<AudioDeviceListenerMac> output_device_listener_;
  
    DISALLOW_COPY_AND_ASSIGN(AudioManagerMac);
  };
  
  }  // namespace media
  
  #endif  // MEDIA_AUDIO_MAC_AUDIO_MANAGER_MAC_H_
  