private static extern int AudioObjectGetPropertyDataSize(
uint inObjectID,
ref AudioObjectPropertyAddress inAddress,
ref uint inQualifierDataSize,
IntPtr inQualifierData,
out uint outDataSize
);
public TOut GetAudioObjectPropertyDataDynamic <TOut>(uint deviceObjectID, AudioObjectPropertySelectorExtended selector, AudioObjectPropertyScope scope)
{
var propertyAddress = new AudioObjectPropertyAddress(selector, scope, AudioObjectPropertyElement.Master);
uint inQualifierDataSize = 0;
IntPtr inQualifierData = IntPtr.Zero; // aka NULL in obj-c
uint dataPropertySize;
var err = AudioObjectGetPropertyDataSize(deviceObjectID, ref propertyAddress, ref inQualifierDataSize, inQualifierData, out dataPropertySize);
if (err != 0)
{
throw new Exception(err.ToString());
}
return(GetAudioObjectPropertyDataFixed <TOut>(deviceObjectID, selector, scope, (int)dataPropertySize));
}
public TOut GetAudioObjectPropertyDataFixed <TOut>(uint deviceObjectID, AudioObjectPropertySelectorExtended selector, AudioObjectPropertyScope scope, int size)
{
var propertyAddress = new AudioObjectPropertyAddress(selector, scope, AudioObjectPropertyElement.Master);
var propInfo = GetUnmanagedPropertyData(deviceObjectID, propertyAddress, size);
if (typeof(TOut) == typeof(int[]))
{
return((TOut)MarshalToIntArray(propInfo));
}
else if (typeof(TOut) == typeof(string))
{
return((TOut)MarshalToString(propInfo));
}
else
{
throw new NotSupportedException("Type not yet handled. Sorry this was built by a lazy engineer.");
}
}
private PropertyDataPointerInfo GetUnmanagedPropertyData(uint deviceObjectID, AudioObjectPropertyAddress propertyAddress, int size)
{
IntPtr resultPtr = Marshal.AllocHGlobal(size);
uint inQualifierDataSize = 0;
IntPtr inQualifierData = IntPtr.Zero; // aka NULL in obj-c
uint dataPropertySize = (uint)size;
var err = AudioObjectGetPropertyData(deviceObjectID, ref propertyAddress, ref inQualifierDataSize, inQualifierData, ref dataPropertySize, resultPtr);
if (err != 0)
{
Marshal.FreeHGlobal(resultPtr);
throw new Exception(String.Format("AudioUnit error '{0}'", err));
}
return(new PropertyDataPointerInfo {
Ptr = resultPtr, SizeInBytes = (int)dataPropertySize
});
}