Mac OS X에서 AudioUnit을 사용하여 스피커/헤드셋 감지

Question

AudioUnit 및 kAudioUnitSubType_HALOutput을 사용하면 출력이 스피커 또는 헤드셋인지 어떻게 감지합니까?

Answer 1

bool usingInternalSpeakers() 
{ 
    AudioDeviceID defaultDevice = 0; 
    UInt32 defaultSize = sizeof(AudioDeviceID); 

    const AudioObjectPropertyAddress defaultAddr = { 
     kAudioHardwarePropertyDefaultOutputDevice, 
     kAudioObjectPropertyScopeGlobal, 
     kAudioObjectPropertyElementMaster 
    }; 

    AudioObjectGetPropertyData(kAudioObjectSystemObject, &defaultAddr, 0, NULL, &defaultSize, &defaultDevice); 

    AudioObjectPropertyAddress property; 
    property.mSelector = kAudioDevicePropertyDataSource; 
    property.mScope = kAudioDevicePropertyScopeOutput; 
    property.mElement = kAudioObjectPropertyElementMaster; 

    UInt32 data; 
    UInt32 size = sizeof(UInt32); 
    AudioObjectGetPropertyData(defaultDevice, &property, 0, NULL, &size, &data); 

    return data == 'ispk'; 
} 


int main(int argc, const char * argv[]) 
{ 


    if (usingInternalSpeakers()) 
     printf("I'm using the speakers!"); 
    else 
     printf("i'm using the headphones!"); 
    return 0; 
}