private int _sequence = 3; // compressed audio packets start after the headers with sequence number 3
private ProcessingState(
VorbisInfo vorbisInfo,
LookupCollection lookups,
float[][] pcm,
int[] window,
int centerWindow)
{
_vorbisInfo = vorbisInfo;
_lookups = lookups;
_pcm = pcm;
_window = window;
_centerWindow = centerWindow;
}
public static ProcessingState Create(VorbisInfo info)
{
if (info == null)
{
throw new ArgumentNullException(nameof(info));
}
var codecSetup = info.CodecSetup;
// initialize the storage vectors. blocksize[1] is small for encode, but the correct size for decode
var pcmStorage = codecSetup.BlockSizes[1];
var pcm = new float[info.Channels][];
for (var i = 0; i < pcm.Length; i++)
{
pcm[i] = new float[pcmStorage];
}
// Vorbis I uses only window type 0
var window = new int[2];
window[0] = Encoding.Log(codecSetup.BlockSizes[0]) - 7;
window[1] = Encoding.Log(codecSetup.BlockSizes[1]) - 7;
var centerWindow = codecSetup.BlockSizes[1] / 2;
var lookups = LookupCollection.Create(info);
return(new ProcessingState(
info,
lookups,
pcm,
window,
centerWindow));
}
