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      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(media::AudioDeviceNames* device_names)
     31       OVERRIDE;
     32   virtual AudioParameters GetInputStreamParameters(
     33       const std::string& device_id) OVERRIDE;
     34 
     35   // Implementation of AudioManagerBase.
     36   virtual AudioOutputStream* MakeLinearOutputStream(
     37       const AudioParameters& params) OVERRIDE;
     38   virtual AudioOutputStream* MakeLowLatencyOutputStream(
     39       const AudioParameters& params,
     40       const std::string& input_device_id) OVERRIDE;
     41   virtual AudioInputStream* MakeLinearInputStream(
     42       const AudioParameters& params, const std::string& device_id) OVERRIDE;
     43   virtual AudioInputStream* MakeLowLatencyInputStream(
     44       const AudioParameters& params, const std::string& device_id) OVERRIDE;
     45 
     46   static bool GetDefaultInputDevice(AudioDeviceID* device);
     47   static bool GetDefaultOutputDevice(AudioDeviceID* device);
     48   static bool GetDefaultDevice(AudioDeviceID* device, bool input);
     49 
     50   static bool GetDefaultOutputChannels(int* channels);
     51 
     52   static bool GetDeviceChannels(AudioDeviceID device,
     53                                 AudioObjectPropertyScope scope,
     54                                 int* channels);
     55 
     56   static int HardwareSampleRateForDevice(AudioDeviceID device_id);
     57   static int HardwareSampleRate();
     58 
     59   // Notify streams of a device change if the default output device or its
     60   // sample rate has changed, otherwise does nothing.
     61   void HandleDeviceChanges();
     62 
     63  protected:
     64   virtual ~AudioManagerMac();
     65 
     66   virtual AudioParameters GetPreferredOutputStreamParameters(
     67       const AudioParameters& input_params) OVERRIDE;
     68 
     69  private:
     70   bool HasUnifiedDefaultIO();
     71 
     72   // Helper methods for constructing AudioDeviceListenerMac on the audio thread.
     73   void CreateDeviceListener();
     74   void DestroyDeviceListener();
     75 
     76   scoped_ptr<AudioDeviceListenerMac> output_device_listener_;
     77 
     78   // Track the output sample-rate and the default output device
     79   // so we can intelligently handle device notifications only when necessary.
     80   int current_sample_rate_;
     81   AudioDeviceID current_output_device_;
     82 
     83   AggregateDeviceManager aggregate_device_manager_;
     84 
     85   DISALLOW_COPY_AND_ASSIGN(AudioManagerMac);
     86 };
     87 
     88 }  // namespace media
     89 
     90 #endif  // MEDIA_AUDIO_MAC_AUDIO_MANAGER_MAC_H_
     91