void CAAudioBufferList::Copy(const AudioBufferList& inSource, UInt32 inStartingSourceChannel, AudioBufferList& outDestination, UInt32 inStartingDestinationChannel)
{
// This is a brute force copy method that can handle ABL's that have different buffer layouts
// This means that this method is probably not the fastest way to do this for all cases.
// This method also assumes that both the source and destination sample formats are Float32
UInt32 theInputChannel = inStartingSourceChannel;
UInt32 theNumberInputChannels = GetTotalNumberChannels(inSource);
UInt32 theOutputChannel = inStartingDestinationChannel;
UInt32 theNumberOutputChannels = GetTotalNumberChannels(outDestination);
UInt32 theInputBufferIndex = 0;
UInt32 theInputBufferChannel = 0;
UInt32 theOutputBufferIndex = 0;
UInt32 theOutputBufferChannel = 0;
while((theInputChannel < theNumberInputChannels) && (theOutputChannel < theNumberOutputChannels))
{
GetBufferForChannel(inSource, theInputChannel, theInputBufferIndex, theInputBufferChannel);
GetBufferForChannel(inSource, theOutputChannel, theOutputBufferIndex, theOutputBufferChannel);
CopyChannel(inSource.mBuffers[theInputBufferIndex], theInputBufferChannel, outDestination.mBuffers[theOutputBufferIndex], theOutputBufferChannel);
++theInputChannel;
++theOutputChannel;
}
}
void CAHALAudioDevice::SetPreferredStereoChannels(bool inIsInput, AudioChannelLayout& inChannelLayout)
{
CAPropertyAddress theAddress(kAudioDevicePropertyPreferredChannelLayout, inIsInput ? kAudioDevicePropertyScopeInput : kAudioDevicePropertyScopeOutput);
UInt32 theSize = OffsetOf32(AudioChannelLayout, mChannelDescriptions) + GetTotalNumberChannels(inIsInput) * SizeOf32(AudioChannelDescription);
SetPropertyData(theAddress, 0, NULL, theSize, &inChannelLayout);
}
void CAHALAudioDevice::GetPreferredChannelLayout(bool inIsInput, AudioChannelLayout& outChannelLayout) const
{
CAPropertyAddress theAddress(kAudioDevicePropertyPreferredChannelLayout, inIsInput ? kAudioDevicePropertyScopeInput : kAudioDevicePropertyScopeOutput);
UInt32 theSize = (SizeOf32(AudioChannelLayout) - SizeOf32(AudioChannelDescription)) + GetTotalNumberChannels(inIsInput) * SizeOf32(AudioChannelDescription);
GetPropertyData(theAddress, 0, NULL, theSize, &outChannelLayout);
}