Пример #1
0
        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);
            }
        }