static extern int ExtAudioFileSetProperty( IntPtr inExtAudioFile, ExtAudioFilePropertyIDType inPropertyID, uint ioPropertyDataSize, ref AudioStreamBasicDescription outPropertyData);
static extern int ExtAudioFileSetProperty( IntPtr inExtAudioFile, ExtAudioFilePropertyIDType inPropertyID, uint ioPropertyDataSize, IntPtr outPropertyData);
static extern int ExtAudioFileGetProperty( IntPtr inExtAudioFile, ExtAudioFilePropertyIDType inPropertyID, ref uint ioPropertyDataSize, ref long outPropertyData);