public static int GetQuantVals(this IStaticCodeBook book)
{
var vals = (int)Math.Floor(Math.Pow(book.LengthList.Length, 1f / book.Dimensions));
// the above *should* be reliable, but we'll not assume that FP is
// ever reliable when bitstream sync is at stake; verify via integer
// means that vals really is the greatest value of dim for which
// vals^b->bim <= b->entries
// treat the above as an initial guess
while (true)
{
var acc = 1;
var acc1 = 1;
for (var i = 0; i < book.Dimensions; i++)
{
acc *= vals;
acc1 *= vals + 1;
}
if ((acc <= book.LengthList.Length) && (acc1 > book.LengthList.Length))
{
return(vals);
}
if (acc > book.LengthList.Length)
{
vals--;
}
else
{
vals++;
}
}
}
public CodeBook(
int dimensions,
int entries,
int usedEntries,
IStaticCodeBook staticBook,
float[] valueList,
uint[] codeList,
int[] decIndex,
byte[] decCodeLengths,
uint[] decFirstTable,
int decFirstTableN,
int decMaxLength,
int quantValues,
int minVal,
int delta)
{
Dimensions = dimensions;
Entries = entries;
UsedEntries = usedEntries;
StaticBook = staticBook;
ValueList = valueList;
CodeList = codeList;
DecIndex = decIndex;
DecCodeLengths = decCodeLengths;
DecFirstTable = decFirstTable;
DecFirstTableN = decFirstTableN;
DecMaxLength = decMaxLength;
QuantValues = quantValues;
MinVal = minVal;
Delta = delta;
}
private static int GetOrAddBook(CodecSetup codecSetup, IStaticCodeBook codeBook)
{
int i;
for (i = 0; i < codecSetup.BookParams.Count; i++)
{
if (codecSetup.BookParams[i] == codeBook)
{
return(i);
}
}
codecSetup.BookParams.Add(codeBook);
return(codecSetup.BookParams.Count - 1);
}
public static CodeBook InitEncode(IStaticCodeBook source)
{
return(new CodeBook(
source.Dimensions,
source.LengthList.Length,
source.LengthList.Length,
source,
null,
Encoding.MakeWords(source.LengthList, 0),
null,
null,
null,
0,
0,
source.GetQuantVals(),
(int)Math.Round(Encoding.UnpackFloat(source.QuantMin)),
(int)Math.Round(Encoding.UnpackFloat(source.QuantDelta))
));
}
public ResidueTemplate(
ResidueType residueType,
ResidueLimitType limitType,
int grouping,
ResidueEntry residue,
IStaticCodeBook bookAux,
IStaticCodeBook booxAuxManaged,
IStaticBookBlock booksBase,
IStaticBookBlock booksBaseManaged)
{
ResidueType = residueType;
LimitType = limitType;
Residue = residue;
BookAux = bookAux;
BookAuxManaged = booxAuxManaged;
BooksBase = booksBase;
BooksBaseManaged = booksBaseManaged;
Grouping = grouping;
}
private static void FillBooks(
CodecSetup codecSetup,
ResidueEntry r,
IStaticCodeBook bookAux,
IStaticBookBlock bookBlock)
{
for (var i = 0; i < r.Partitions; i++)
{
for (var k = 0; k < 4; k++)
{
if ((i < bookBlock.Books.Length) &&
(k < bookBlock.Books[i].Length) &&
(bookBlock.Books[i][k] != null))
{
r.SecondStages[i] |= 1 << k;
}
}
}
r.GroupBook = GetOrAddBook(codecSetup, bookAux);
var booklist = 0;
for (var i = 0; i < r.Partitions; i++)
{
for (var k = 0; k < 4; k++)
{
if ((i < bookBlock.Books.Length) &&
(k < bookBlock.Books[i].Length))
{
var sourceBook = bookBlock.Books[i][k];
if (sourceBook != null)
{
var bookid = GetOrAddBook(codecSetup, sourceBook);
r.BookList[booklist++] = bookid;
}
}
}
}
}
private void PackStaticBook(EncodeBuffer buffer, IStaticCodeBook book)
{
var ordered = false;
// first the basic parameters
buffer.Write(0x564342, 24);
buffer.Write((uint)book.Dimensions, 16);
buffer.Write((uint)book.LengthList.Length, 24);
// pack the codewords. There are two packing types; length ordered and length random.
int i;
for (i = 1; i < book.LengthList.Length; i++)
{
if ((book.LengthList[i - 1] == 0) || (book.LengthList[i] < book.LengthList[i - 1]))
{
break;
}
}
if (i == book.LengthList.Length)
{
ordered = true;
}
if (ordered)
{
// length ordered. We only need to say how many codewords of each length. The actual codewords are generated deterministically
buffer.Write(1, 1);
buffer.Write((uint)(book.LengthList[0] - 1), 5); // 1 to 32
var count = 0;
for (i = 1; i < book.LengthList.Length; i++)
{
var current = book.LengthList[i];
var previous = book.LengthList[i - 1];
if (current <= previous)
{
continue;
}
for (var j = previous; j < current; j++)
{
buffer.Write((uint)(i - count), Encoding.Log(book.LengthList.Length - count));
count = i;
}
}
buffer.Write((uint)(i - count), Encoding.Log(book.LengthList.Length - count));
}
else
{
// length unordered. Again, we don't code the codeword itself, just the length. This time, though, we have to encode each length
buffer.Write(0, 1);
/* algorithmic mapping has use for 'unused entries', which we tag
* here. The algorithmic mapping happens as usual, but the unused
* entry has no codeword. */
for (i = 0; i < book.LengthList.Length; i++)
{
if (book.LengthList[i] == 0)
{
break;
}
}
if (i == book.LengthList.Length)
{
buffer.Write(0, 1); // no unused entries
for (i = 0; i < book.LengthList.Length; i++)
{
buffer.Write((uint)(book.LengthList[i] - 1), 5);
}
}
else
{
buffer.Write(1, 1); // we have unused entries; thus we tag
for (i = 0; i < book.LengthList.Length; i++)
{
if (book.LengthList[i] == 0)
{
buffer.Write(0, 1);
}
else
{
buffer.Write(1, 1);
buffer.Write((uint)(book.LengthList[i] - 1), 5);
}
}
}
}
buffer.Write((uint)book.MapType, 4);
if (book.MapType == CodeBookMapType.None)
{
return;
}
// is the entry number the desired return value, or do we have a mapping? If we have a mapping, what type?
if ((book.MapType != CodeBookMapType.Implicit) && (book.MapType != CodeBookMapType.Listed))
{
throw new InvalidOperationException("Unknown CodeBookMapType: {book.MapType}");
}
if (book.QuantList == null)
{
throw new InvalidOperationException("QuantList cannot be null");
}
// values that define the dequantization
buffer.Write((uint)book.QuantMin, 32);
buffer.Write((uint)book.QuantDelta, 32);
buffer.Write((uint)(book.Quant - 1), 4);
buffer.Write((uint)book.QuantSequenceP, 1);
var quantVals = 0;
switch (book.MapType)
{
case CodeBookMapType.Implicit:
// a single column of (c.entries/c.dim) quantized values for building a full value list algorithmically (square lattice)
quantVals = book.GetQuantVals();
break;
case CodeBookMapType.Listed:
// every value (c.entries*c.dim total) specified explicitly
quantVals = book.LengthList.Length * book.Dimensions;
break;
}
// quantized values
for (i = 0; i < quantVals; i++)
{
buffer.Write((uint)Math.Abs(book.QuantList[i]), book.Quant);
}
}