Firing up a RemoteIO

gistfile1.cpp

UInt32 propSize = sizeof(UInt32);
UInt32 inputAvailable;

AudioSessionGetProperty(kAudioSessionProperty_AudioInputAvailable,&propSize,&inputAvailable);

if(!inputAvailable)
{
	std::cout << "No input available!" << std::endl;
	return false;
}
	
Float64 sampleRate;
propSize = sizeof(sampleRate);

AudioSessionGetProperty(kAudioSessionProperty_CurrentHardwareSampleRate, &propSize, &sampleRate);
AudioUnitUninitialize(*_unit);
AudioUnitElement inputBus  = 1;
AudioUnitElement outputBus = 0;
UInt32 on = 1;
UInt32 off = 0;
	
AudioUnitSetProperty(*_unit,kAudioOutputUnitProperty_EnableIO, kAudioUnitScope_Output, outputBus, &off, sizeof(off));
AudioUnitSetProperty(*_unit, kAudioOutputUnitProperty_EnableIO, kAudioUnitScope_Input, inputBus, &on, sizeof(on));
	
AudioStreamBasicDescription asbd = {0};
asbd.mSampleRate        = sampleRate;
asbd.mFormatID          = kAudioFormatLinearPCM;
asbd.mFormatFlags       = kAudioFormatFlagsAudioUnitCanonical;
asbd.mFramesPerPacket   = 1;
asbd.mBitsPerChannel    = 8 * sizeof(AudioUnitSampleType);
asbd.mBytesPerPacket    = asbd.mBytesPerFrame = sizeof(AudioUnitSampleType);
asbd.mChannelsPerFrame  = 2;
	
AudioUnitSetProperty(*_unit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, 1, &asbd, sizeof(asbd));