void _audioUnit_RenderCallback(object sender, AudioUnitEventArgs e)
{
// reading buffer
uint numberFrames = e.NumberFrames;
numberFrames = _extAudioFile.Read(numberFrames, e.Data);
// is EOF?
if (numberFrames != e.NumberFrames)
{
// loop back to file head
_extAudioFile.Seek(0);
Stop();
}
}
void prepareExtAudioFile()
{
// Opening Audio File
_extAudioFile = ExtAudioFile.OpenURL(_url);
// Getting file data format
_srcFormat = _extAudioFile.FileDataFormat;
// Setting the channel number of the output format same to the input format
_dstFormat = AudioUnitUtils.AUCanonicalASBD(_sampleRate, _srcFormat.ChannelsPerFrame);
// setting reading format as audio unit cannonical format
_extAudioFile.ClientDataFormat = _dstFormat;
// getting total frame
_totalFrames = _extAudioFile.FileLengthFrames;
// Seeking to the file head
_extAudioFile.Seek(0);
}