internal static short[] GetCoefficients(BitReader bReader, ImgInfo imgInfo, int compIndex, int numCoefs)
{
var coefZig = new short[numCoefs];
int acIndex = imgInfo.components[compIndex].acHuffmanTable;
int dcIndex = imgInfo.components[compIndex].dcHuffmanTable;
// DC coefficient
uint runAmplitude = Huffman.ReadRunAmplitude(bReader, imgInfo.huffmanTables[0, dcIndex]);
uint run; // = runAmplitude >> 4; // Upper nybble
uint amplitude = runAmplitude & 0xf; // Lower nybble
coefZig[0] = (short)(Huffman.ReadCoefValue(bReader, amplitude) + imgInfo.deltaDc[compIndex]);
imgInfo.deltaDc[compIndex] = coefZig[0];
// AC coefficients
uint pos = 0;
while (pos < blkSize * blkSize - 1)
{
runAmplitude = Huffman.ReadRunAmplitude(bReader, imgInfo.huffmanTables[1, acIndex]);
// 0x00 is End of Block
if (runAmplitude == 0x00)
{
break;
}
run = runAmplitude >> 4;
amplitude = runAmplitude & 0xf;
pos += run + 1;
if (pos >= blkSize * blkSize)
{
break;
}
coefZig[pos] = Huffman.ReadCoefValue(bReader, amplitude);
}
return(coefZig);
}
static string ToBinary(Huffman.CodeInfo number)
{
string numStr = string.Empty;
while (number.length > 0)
{
numStr = (number.code & 1) + numStr;
number.code >>= 1;
number.length--;
}
return numStr;
}
