internal void Initialize()
{
// Buffer the metadata writes in memory by swapping the stream
using (var tempStream = new MemoryStream())
{
var fileStream = _stream;
_stream = tempStream;
SafeNativeMethods.StreamEncoderInitStream(_handle, _writeCallback, _seekCallback, _tellCallback, null,
IntPtr.Zero);
// Pre-allocate the whole stream (estimate worst case compression, plus metadata)
fileStream.SetLength(
SafeNativeMethods.StreamEncoderGetChannels(_handle) *
(uint)Math.Ceiling(SafeNativeMethods.StreamEncoderGetBitsPerSample(_handle) / 8.0) *
(long)SafeNativeMethods.StreamEncoderGetTotalSamplesEstimate(_handle) +
tempStream.Length);
// Flush the metadata to the output stream, and swap the streams back
_stream = fileStream;
tempStream.WriteTo(fileStream);
}
}