/// <summary>
/// Writes the header pages that start the Ogg Speex file. Prepares file for
/// data to be written.
/// </summary>
///
/// <param name="comment">description to be included in the header.</param>
/// @exception IOException
public override void WriteHeader(String comment)
{
byte[] header;
byte[] data;
NSpeex.OggCrc crc = new NSpeex.OggCrc();
/* writes the OGG header page */
header = BuildOggPageHeader(2, 0,
streamSerialNumber, pageCount++, 1, new byte[] { 80 });
data = NSpeex.AudioFileWriter.BuildSpeexHeader(sampleRate, mode,
channels, vbr, nframes);
crc.Initialize();
crc.TransformBlock(header, 0, header.Length, header, 0);
crc.TransformFinalBlock(data, 0, data.Length);
xout.Write(header, 0, 22);
xout.Write(crc.Hash, 0, crc.HashSize / 8);
xout.Write(header, 26, header.Length - 26);
xout.Write(data, 0, data.Length);
/* writes the OGG comment page */
header = BuildOggPageHeader(0, 0,
streamSerialNumber, pageCount++, 1,
new byte[] { (byte)(comment.Length + 8) });
data = NSpeex.AudioFileWriter.BuildSpeexComment(comment);
crc.Initialize();
crc.TransformBlock(header, 0, header.Length, header, 0);
crc.TransformFinalBlock(data, 0, data.Length);
xout.Write(header, 0, 22);
xout.Write(crc.Hash, 0, crc.HashSize / 8);
xout.Write(header, 26, header.Length - 26);
xout.Write(data, 0, data.Length);
}
/// <summary>
/// Flush the Ogg page out of the buffers into the file.
/// </summary>
///
/// <param name="eos"> -</param>
/// @exception IOException
private void Flush(bool eos)
{
byte[] header;
NSpeex.OggCrc crc = new NSpeex.OggCrc();
/* writes the OGG header page */
header = BuildOggPageHeader(((eos) ? 4 : 0),
granulepos, streamSerialNumber, pageCount++, packetCount,
headerBuffer);
crc.Initialize();
crc.TransformBlock(header, 0, header.Length, header, 0);
crc.TransformFinalBlock(dataBuffer, 0, dataBufferPtr);
xout.Write(header, 0, 22);
xout.Write(crc.Hash, 0, crc.HashSize / 8);
xout.Write(header, 26, header.Length - 26);
xout.Write(dataBuffer, 0, dataBufferPtr);
dataBufferPtr = 0;
headerBufferPtr = 0;
packetCount = 0;
}
