/// <summary>
/// This reads the format section
/// </summary>
void ReadFmt()
{
var pos = binaryReader.BaseStream.Position;
// The audio format is given here
AudioFormat = binaryReader.ReadUInt16();
// Get the parameters that we'll use to decode the audio file
// note: some of these parameters aren't stored here; with the internal
// Vorbis format, the extra header has those
NumChannels = binaryReader.ReadUInt16();
SampleRate = binaryReader.ReadUInt32();
AvgBytesPerSec = binaryReader.ReadUInt32();
BlockAlign = binaryReader.ReadUInt16();
BitsPerSample = binaryReader.ReadUInt16();
var extraSize = binaryReader.ReadUInt16();
// There is maybe some extra stuff, but I'm going to ignore them unless
// we have no choice
if (2 == AudioFormat)
{
// IMA Wave format
return;
}
if (0xffff != AudioFormat)
{
// This is a format that we don't support. (Most likely it is a
// format not supported on Vector.
throw new System.Exception("Unsupported audio format");
}
// This is a Vorbis style audio, get information
binaryReader.BaseStream.Position = pos + 0x18;
numSamples = binaryReader.ReadUInt32();
binaryReader.BaseStream.Position = pos + 0x18 + 0x10;
setup_ofs = binaryReader.ReadUInt32();
audio_ofs = binaryReader.ReadUInt32();
binaryReader.BaseStream.Position = pos + 0x18 + 0x28;
var blocksize_1_exp = binaryReader.ReadByte();
var blocksize_0_exp = binaryReader.ReadByte();
transcoder = new Vorbis(blocksize_0_exp, blocksize_1_exp);
transcoder.NumChannels = NumChannels;
transcoder.SampleRate = SampleRate;
}
