audio_manager_mac.h revision 868fa2fe829687343ffae624259930155e16dbd8
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 18namespace 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. 23class 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 protected: 60 virtual ~AudioManagerMac(); 61 62 virtual AudioParameters GetPreferredOutputStreamParameters( 63 const AudioParameters& input_params) OVERRIDE; 64 65 private: 66 bool HasUnifiedDefaultIO(); 67 68 // Helper methods for constructing AudioDeviceListenerMac on the audio thread. 69 void CreateDeviceListener(); 70 void DestroyDeviceListener(); 71 void HandleDeviceChanges(); 72 73 scoped_ptr<AudioDeviceListenerMac> output_device_listener_; 74 75 // Track the output sample-rate and the default output device 76 // so we can intelligently handle device notifications only when necessary. 77 int current_sample_rate_; 78 AudioDeviceID current_output_device_; 79 80 AggregateDeviceManager aggregate_device_manager_; 81 82 DISALLOW_COPY_AND_ASSIGN(AudioManagerMac); 83}; 84 85} // namespace media 86 87#endif // MEDIA_AUDIO_MAC_AUDIO_MANAGER_MAC_H_ 88