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;
// Aloocating AudoBufferList
_buffer = new MutableAudioBufferList(_srcFormat.ChannelsPerFrame, (int) (sizeof(uint) * _totalFrames));
_numberOfChannels = _srcFormat.ChannelsPerFrame;
// Reading all frame into the buffer
_extAudioFile.Read((int) _totalFrames, _buffer);
}
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 = AudioStreamBasicDescription.CreateLinearPCM (channelsPerFrame: (uint)_srcFormat.ChannelsPerFrame, bitsPerChannel: 32);
_dstFormat.FormatFlags |= AudioFormatFlags.IsNonInterleaved;
// setting reading format as audio unit cannonical format
_extAudioFile.ClientDataFormat = _dstFormat;
// getting total frame
_totalFrames = _extAudioFile.FileLengthFrames;
// Allocating AudioBufferList
_buffer = new AudioBuffers (_srcFormat.ChannelsPerFrame);
for (int i = 0; i < _buffer.Count; ++i) {
int size = (int)(sizeof(uint) * _totalFrames);
_buffer.SetData (i, Marshal.AllocHGlobal (size), size);
}
_numberOfChannels = _srcFormat.ChannelsPerFrame;
// Reading all frame into the buffer
ExtAudioFileError status;
_extAudioFile.Read ((uint)_totalFrames, _buffer, out status);
if (status != ExtAudioFileError.OK)
throw new ApplicationException ();
}