AudioDevice.cpp

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/*=============================================================================
	AudioDevice.cpp
	
=============================================================================*/

#include "AudioDevice.h"

void	AudioDevice::Init(AudioDeviceID devid, bool isInput)
{
	mID = devid;
	mIsInput = isInput;
	if (mID == kAudioDeviceUnknown) return;
	
	UInt32 propsize;
	AudioObjectPropertyAddress aopa;
    
	propsize = sizeof(UInt32);
    aopa.mSelector = kAudioDevicePropertySafetyOffset;
    aopa.mScope = kAudioObjectPropertyScopeGlobal;
    aopa.mElement = kAudioObjectPropertyElementMaster;    
    verify_noerr(AudioObjectGetPropertyData( mID, &aopa, 0, NULL, &propsize, &mSafetyOffset ));
	
	propsize = sizeof(UInt32);
    aopa.mSelector = kAudioDevicePropertyBufferFrameSize;
    verify_noerr(AudioObjectGetPropertyData( mID, &aopa, 0, NULL, &propsize, &mBufferSizeFrames ));
	
	propsize = sizeof(AudioStreamBasicDescription);
    aopa.mSelector = kAudioDevicePropertyStreamFormat;
    aopa.mScope = mIsInput ? kAudioDevicePropertyScopeInput : kAudioDevicePropertyScopeOutput;
    verify_noerr(AudioObjectGetPropertyData( mID, &aopa, 0, NULL, &propsize, &mFormat ));
}

void	AudioDevice::SetBufferSize(UInt32 size)
{
	UInt32 propsize = sizeof(UInt32);
	AudioObjectPropertyAddress aopa;
    
    aopa.mSelector = kAudioDevicePropertyBufferFrameSize;
    aopa.mScope = mIsInput ? kAudioDevicePropertyScopeInput : kAudioDevicePropertyScopeOutput;
    aopa.mElement = kAudioObjectPropertyElementMaster;
    verify_noerr(AudioObjectSetPropertyData( mID, &aopa, 0, NULL, propsize, &size ) );

	propsize = sizeof(UInt32);
    verify_noerr(AudioObjectGetPropertyData( mID, &aopa, 0, NULL, &propsize, &mBufferSizeFrames ));    
}

int		AudioDevice::CountChannels()
{
	OSStatus err;
	UInt32 propSize;
	AudioObjectPropertyAddress aopa;    
	int result = 0;
	
    aopa.mSelector = kAudioDevicePropertyStreamConfiguration;
    aopa.mScope = mIsInput ? kAudioDevicePropertyScopeInput : kAudioDevicePropertyScopeOutput;
    aopa.mElement = kAudioObjectPropertyElementMaster;
    err = AudioObjectGetPropertyDataSize(mID, &aopa, 0, NULL, &propSize );
	if (err) return 0;

	AudioBufferList *buflist = (AudioBufferList *)malloc(propSize);
    err = AudioObjectGetPropertyData(mID, &aopa, 0, NULL, &propSize, buflist );
	if (!err) {
		for (UInt32 i = 0; i < buflist->mNumberBuffers; ++i) {
			result += buflist->mBuffers[i].mNumberChannels;
		}
	}
	free(buflist);
	return result;
}

char *	AudioDevice::GetName(char *buf, UInt32 maxlen)
{
	AudioObjectPropertyAddress aopa;
    aopa.mSelector = kAudioDevicePropertyDeviceName;
    aopa.mScope = kAudioObjectPropertyScopeGlobal;
    aopa.mElement = kAudioObjectPropertyElementMaster;
    verify_noerr(AudioObjectGetPropertyData(mID, &aopa, 0, NULL, &maxlen, buf));
	return buf;
}