protected void blockInter(BitReader bits, VLC vlcCoeff, int[] block, int[] scan, int escSize, int qScale,
int[] qmat)
{
// System.out.println();
int idx = -1;
if (vlcCoeff == MPEGConst.vlcCoeff0 && bits.checkNBit(1) == 1)
{
bits.read1Bit();
int dc = toSigned(quantInter(1, qScale * qmat[0]), bits.read1Bit());
SparseIDCT.start(block, dc);
idx++;
}
else
{
SparseIDCT.start(block, 0);
}
for (; idx < 64;)
{
int readVLC = vlcCoeff.readVLC(bits);
int ac;
if (readVLC == MPEGConst.CODE_END)
{
break;
}
else if (readVLC == MPEGConst.CODE_ESCAPE)
{
idx += bits.readNBit(6) + 1;
ac = quantInterSigned(twosSigned(bits, escSize), qScale * qmat[idx]);
}
else
{
idx += (readVLC >> 6) + 1;
ac = toSigned(quantInter(readVLC & 0x3f, qScale * qmat[idx]), bits.read1Bit());
}
SparseIDCT.coeff(block, scan[idx], ac);
// System.out.print(ac + ",");
}
SparseIDCT.finish(block);
}
protected void blockIntra(BitReader bits, VLC vlcCoeff, int[] block, int[] intra_dc_predictor, int blkIdx,
int[] scan, int escSize, int intra_dc_mult, int qScale, int[] qmat)
{
int cc = MPEGConst.BLOCK_TO_CC[blkIdx];
int size = (cc == 0 ? MPEGConst.vlcDCSizeLuma : MPEGConst.vlcDCSizeChroma).readVLC(bits);
int delta = (size != 0) ? mpegSigned(bits, size) : 0;
intra_dc_predictor[cc] = intra_dc_predictor[cc] + delta;
int dc = intra_dc_predictor[cc] * intra_dc_mult;
SparseIDCT.start(block, dc);
for (int idx = 0; idx < 64;)
{
int readVLC = vlcCoeff.readVLC(bits);
int level;
if (readVLC == MPEGConst.CODE_END)
{
break;
}
else if (readVLC == MPEGConst.CODE_ESCAPE)
{
idx += bits.readNBit(6) + 1;
level = twosSigned(bits, escSize) * qScale * qmat[idx];
level = level >= 0 ? (level >> 4) : -(-level >> 4);
}
else
{
idx += (readVLC >> 6) + 1;
level = toSigned(((readVLC & 0x3f) * qScale * qmat[idx]) >> 4, bits.read1Bit());
}
SparseIDCT.coeff(block, scan[idx], level);
}
SparseIDCT.finish(block);
}