media/audio/mac/audio_manager_mac.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_MAC_AUDIO_MANAGER_MAC_H_
   6 #define MEDIA_AUDIO_MAC_AUDIO_MANAGER_MAC_H_
   7
   8 #include <CoreAudio/AudioHardware.h>
   9 #include <string>
  10
  11 #include "base/basictypes.h"
  12 #include "base/compiler_specific.h"
  13 #include "base/message_loop/message_loop_proxy.h"
  14 #include "media/audio/audio_manager_base.h"
  15 #include "media/audio/mac/aggregate_device_manager.h"
  16 #include "media/audio/mac/audio_device_listener_mac.h"
  17
  18 namespace media {
  19
  20 // Mac OS X implementation of the AudioManager singleton. This class is internal
  21 // to the audio output and only internal users can call methods not exposed by
  22 // the AudioManager class.
  23 class MEDIA_EXPORT AudioManagerMac : public AudioManagerBase {
  24  public:
  25   AudioManagerMac();
  26
  27   // Implementation of AudioManager.
  28   virtual bool HasAudioOutputDevices() OVERRIDE;
  29   virtual bool HasAudioInputDevices() OVERRIDE;
  30   virtual void GetAudioInputDeviceNames(
  31       AudioDeviceNames* device_names) OVERRIDE;
  32   virtual void GetAudioOutputDeviceNames(
  33       AudioDeviceNames* device_names) OVERRIDE;
  34   virtual AudioParameters GetInputStreamParameters(
  35       const std::string& device_id) OVERRIDE;
  36   virtual std::string GetAssociatedOutputDeviceID(
  37       const std::string& input_device_id) OVERRIDE;
  38
  39   // Implementation of AudioManagerBase.
  40   virtual AudioOutputStream* MakeLinearOutputStream(
  41       const AudioParameters& params) OVERRIDE;
  42   virtual AudioOutputStream* MakeLowLatencyOutputStream(
  43       const AudioParameters& params,
  44       const std::string& device_id,
  45       const std::string& input_device_id) OVERRIDE;
  46   virtual AudioInputStream* MakeLinearInputStream(
  47       const AudioParameters& params, const std::string& device_id) OVERRIDE;
  48   virtual AudioInputStream* MakeLowLatencyInputStream(
  49       const AudioParameters& params, const std::string& device_id) OVERRIDE;
  50   virtual std::string GetDefaultOutputDeviceID() OVERRIDE;
  51
  52   static bool GetDefaultInputDevice(AudioDeviceID* device);
  53   static bool GetDefaultOutputDevice(AudioDeviceID* device);
  54   static bool GetDefaultDevice(AudioDeviceID* device, bool input);
  55
  56   static bool GetDefaultOutputChannels(int* channels);
  57
  58   static bool GetDeviceChannels(AudioDeviceID device,
  59                                 AudioObjectPropertyScope scope,
  60                                 int* channels);
  61
  62   static int HardwareSampleRateForDevice(AudioDeviceID device_id);
  63   static int HardwareSampleRate();
  64
  65   // Notify streams of a device change if the default output device or its
  66   // sample rate has changed, otherwise does nothing.
  67   void HandleDeviceChanges();
  68
  69  protected:
  70   virtual ~AudioManagerMac();
  71
  72   virtual AudioParameters GetPreferredOutputStreamParameters(
  73       const std::string& output_device_id,
  74       const AudioParameters& input_params) OVERRIDE;
  75
  76  private:
  77   bool HasUnifiedDefaultIO();
  78
  79   // Helper methods for constructing AudioDeviceListenerMac on the audio thread.
  80   void CreateDeviceListener();
  81   void DestroyDeviceListener();
  82
  83   int ChooseBufferSize(int output_sample_rate);
  84
  85   scoped_ptr<AudioDeviceListenerMac> output_device_listener_;
  86
  87   // Track the output sample-rate and the default output device
  88   // so we can intelligently handle device notifications only when necessary.
  89   int current_sample_rate_;
  90   AudioDeviceID current_output_device_;
  91
  92   AggregateDeviceManager aggregate_device_manager_;
  93
  94   DISALLOW_COPY_AND_ASSIGN(AudioManagerMac);
  95 };
  96
  97 }  // namespace media
  98
  99 #endif  // MEDIA_AUDIO_MAC_AUDIO_MANAGER_MAC_H_