public static WaveFact Parse(BinaryReader reader)
{
var fact = new WaveFact();
fact.SubChunkID = reader.ReadFourCc();
if (fact.SubChunkID != "fact")
{
throw new InvalidDataException("Invalid or missing .wav file fact chunk!");
}
fact.SubChunkSize = reader.ReadUInt32();
if (fact.SubChunkSize != 4)
{
throw new NotSupportedException("Invalid or unknown .wav compression format!");
}
fact.NumSamples = reader.ReadUInt32();
return(fact);
}
public WaveDecoder(Stream s)
{
using (BinaryReader br = new BinaryReader(s))
{
_header = RiffHeader.Parse(br);
_format = WaveFormat.Parse(br);
if (_format.AudioFormat != WaveFormatType.Pcm)
{
_fact = WaveFact.Parse(br);
}
_data = WaveData.Parse(br);
var variant = WavParser.GetParser(_format.AudioFormat);
_decodedData = variant.Parse(br, (int)_data.SubChunkSize, _format);
_audioFormat.BitsPerSample = variant.BitsPerSample;
_audioFormat.Channels = _format.NumChannels;
_audioFormat.SampleRate = (int)_format.SampleRate;
_numSamples = _samplesLeft = _decodedData.Length / _audioFormat.BytesPerSample;
}
}
