private Residue ReadResidue(BitReader r)
{
int residueType = (int)r.ReadUnsigned(16);
int begin = (int)r.ReadUnsigned(24);
int end = (int)r.ReadUnsigned(24);
int partitionSize = (int)r.ReadUnsigned(24) + 1;
int classifications = (int)r.ReadUnsigned(6) + 1;
int classBook = (int)r.ReadUnsigned(8);
if (begin > end)
throw new VorbisReadException("Residue begin should not be greater than end");
if (classBook >= codebooks.Count)
throw new VorbisReadException("Bad codebook index for residue's classBook: {0}", classBook);
WriteLine(" Residue type: {0}", residueType);
WriteLine(" Begin: {0}", begin);
WriteLine(" End: {0}", end);
WriteLine(" Partition size: {0}", partitionSize);
WriteLine(" Classifications: {0}", classifications);
WriteLine(" Class book: {0}", classBook);
int[] residueCascade = new int[classifications];
//int[,] residueBooks = new int[classifications, 8];
//bool[,] residueBooksUsed = new bool[classifications, 8];
Codebook[,] residueBooks = new Codebook[classifications, 8];
for (int i = 0; i < classifications; ++i)
{
int highBits = 0;
int lowBits = (int)r.ReadUnsigned(3);
bool bitFlag = r.ReadBit();
if (bitFlag)
highBits = (int)r.ReadUnsigned(5);
residueCascade[i] = highBits * 8 + lowBits;
WriteLine(" Residue cascade[{0}] = {1}", i, residueCascade[i]);
}
for (int i = 0; i < classifications; ++i)
{
for (int j = 0; j < 8; ++j)
{
if ((residueCascade[i] & (1 << j)) != 0)
{
int booknum = (int)r.ReadUnsigned(8);
if (booknum >= codebooks.Count)
throw new VorbisReadException("Bad codebook index when reading residueBooks[{0}][{1}]: {2}", i, j, booknum);
WriteLine(" Residue books[{0},{1}] = {2}", i, j, booknum);
residueBooks[i, j] = codebooks[booknum];
}
else
{
WriteLine(" Residue books[{0},{1}] = unused", i, j);
}
}
}
Residue residue = new Residue();
residue.Type = residueType;
residue.Begin = begin;
residue.End = end;
residue.PartitionSize = partitionSize;
residue.ClassificationCount = classifications;
residue.ClassBook = codebooks[classBook];
residue.Cascade = residueCascade;
residue.Books = residueBooks;
return residue;
}
private void DecodeFormat1(BitReader r, Codebook vqbook, int offset, float[] v)
{
int n = PartitionSize;
int i=0;
do
{
float[] entryTemp = vqbook.VectorLookup(r);
for (int j = 0; j < vqbook.Dimensions; ++j)
{
v[offset + i] += entryTemp[j];
++i;
}
} while(i <n);
}
private Codebook ReadCodebook(BitReader r)
{
Codebook cb = new Codebook();
cb.Dimensions = (int)r.ReadUnsigned(16);
cb.Entries = (int)r.ReadUnsigned(24);
int dimensions = cb.Dimensions;
int entries = cb.Entries;
//Console.WriteLine(" Dimensions: {0}", cb.Dimensions);
//Console.WriteLine(" Entries: {0}", cb.Entries);
cb.RootNode = ReadHuffman(cb.Entries, r);
//root.Dump();
int lookupType = (int)r.ReadUnsigned(4);
cb.LookupType = lookupType;
//Console.WriteLine(" Lookup type: {0}", lookupType);
if (lookupType == 0)
{
// nothing to do
}
else if (lookupType == 1 || lookupType == 2)
{
float minimumValue = r.ReadVorbisFloat();
float deltaValue = r.ReadVorbisFloat();
uint valueBits = r.ReadUnsigned(4) + 1;
bool sequenceP = r.ReadBit();
int lookupValues;
//Console.WriteLine(" Minimum value: {0}", minimumValue);
//Console.WriteLine(" Delta value: {0}", deltaValue);
//Console.WriteLine(" Value bits: {0}", valueBits);
//Console.WriteLine(" Sequence P: {0}", sequenceP ? 1 : 0);
cb.MinimumValue = minimumValue;
cb.DeltaValue = deltaValue;
cb.SequenceP = sequenceP;
if (lookupType == 1)
{
lookupValues = lookup1_values(entries, dimensions);
if (Math.Pow(lookupValues, dimensions) > entries)
{
// this is actually not a problem w/ the file, it's a problem w/ the decoder if this happens
throw new VorbisReadException("lookup1 is busted");
}
}
else
{
lookupValues = (int)entries * (int)dimensions;
}
//Console.WriteLine(" Lookup values: {0}", lookupValues);
uint[] multiplicands = new uint[lookupValues];
for (int i = 0; i < lookupValues; ++i)
{
multiplicands[i] = r.ReadUnsigned((int)valueBits);
//Console.WriteLine(" Multiplicands[{0}] = {1}", i, multiplicands[i]);
}
cb.Multiplicands = multiplicands;
}
else if (lookupType > 2)
{
throw new VorbisReadException("Invalid lookup type. Only types 0, 1 and 2 are supported");
}
return cb;
}