public SampleCollection DecodeSamples()
{
Contract.Ensures(_buffer != null);
Contract.Ensures(Contract.Result <SampleCollection>() != null);
uint sampleCount = 4096;
if (_buffer == null)
{
_buffer = new int[sampleCount * _inputDescription.ChannelsPerFrame];
}
GCHandle handle = GCHandle.Alloc(_buffer, GCHandleType.Pinned);
try
{
var bufferList = new AudioBufferList
{
NumberBuffers = 1,
Buffers = new AudioBuffer[1]
};
bufferList.Buffers[0].NumberChannels = _inputDescription.ChannelsPerFrame;
bufferList.Buffers[0].DataByteSize = (uint)(_buffer.Length);
bufferList.Buffers[0].Data = handle.AddrOfPinnedObject();
AudioConverterStatus status = _converter.FillBuffer(ref sampleCount, ref bufferList, null);
if (status != AudioConverterStatus.Ok)
{
throw new IOException(string.Format(CultureInfo.CurrentCulture,
Resources.LosslessSampleDecoderFillBufferError, status));
}
SampleCollection result =
SampleCollectionFactory.Instance.Create((int)_inputDescription.ChannelsPerFrame, (int)sampleCount);
// De-interlace the output buffer into the new sample collection, converting to floating point values:
var index = 0;
for (var sample = 0; sample < result.SampleCount; sample++)
{
for (var channel = 0; channel < result.Channels; channel++)
{
result[channel][sample] = _buffer[index++] / _divisor;
}
}
return(result);
}
finally
{
handle.Free();
}
}
