private void writeCoeffAbsLevel(MEncoder encoder, BlockType blockType, int numDecodAbsLevelGt1,
int numDecodAbsLevelEq1, int absLev)
{
int incB0 = ((numDecodAbsLevelGt1 != 0) ? 0 : Math.Min(4, 1 + numDecodAbsLevelEq1));
int incBN = 5 + Math.Min(4 - blockType.coeffAbsLevelAdjust, numDecodAbsLevelGt1);
if (absLev == 0)
{
encoder.encodeBin(blockType.coeffAbsLevelCtxOff + incB0, 0);
}
else
{
encoder.encodeBin(blockType.coeffAbsLevelCtxOff + incB0, 1);
if (absLev < 14)
{
for (int i = 1; i < absLev; i++)
{
encoder.encodeBin(blockType.coeffAbsLevelCtxOff + incBN, 1);
}
encoder.encodeBin(blockType.coeffAbsLevelCtxOff + incBN, 0);
}
else
{
for (int i = 1; i < 14; i++)
{
encoder.encodeBin(blockType.coeffAbsLevelCtxOff + incBN, 1);
}
absLev -= 14;
int sufLen, pow;
for (sufLen = 0, pow = 1; absLev >= pow; sufLen++, pow = (1 << sufLen))
{
encoder.encodeBinBypass(1);
absLev -= pow;
}
encoder.encodeBinBypass(0);
for (sufLen--; sufLen >= 0; sufLen--)
{
encoder.encodeBinBypass((absLev >> sufLen) & 1);
}
}
}
}
public void writeCoeffs(MEncoder encoder, BlockType blockType, int[] _out, int first, int num, int[] reorder)
{
for (int i = 0; i < num; i++)
{
tmp[i] = _out[reorder[first + i]];
}
int numCoeff = 0;
for (int i = 0; i < num; i++)
{
if (tmp[i] != 0)
{
numCoeff = i + 1;
}
}
for (int i = 0; i < Math.Min(numCoeff, num - 1); i++)
{
if (tmp[i] != 0)
{
encoder.encodeBin(blockType.sigCoeffFlagCtxOff + i, 1);
encoder.encodeBin(blockType.lastSigCoeffCtxOff + i, i == numCoeff - 1 ? 1 : 0);
}
else
{
encoder.encodeBin(blockType.sigCoeffFlagCtxOff + i, 0);
}
}
int numGt1 = 0, numEq1 = 0;
for (int j = numCoeff - 1; j >= 0; j--)
{
if (tmp[j] == 0)
{
continue;
}
int absLev = Math.Abs(tmp[j]) - 1;
writeCoeffAbsLevel(encoder, blockType, numGt1, numEq1, absLev);
if (absLev == 0)
{
++numEq1;
}
else
{
++numGt1;
}
encoder.encodeBinBypass(sign(tmp[j]));
}
}