private int DecodeSignificantAbsLevel(CAdaptiveHuffman pAHexpt)
{
int iFixed, iLevel;
uint iIndex = (uint)pAHexpt.GetHuff(bitIO);
System.Diagnostics.Debug.Assert( iIndex <= 6 );
pAHexpt.m_iDiscriminant += pAHexpt.m_pDelta[iIndex];
if (iIndex < 2)
{
iLevel = (int)(iIndex + 2);
}
else if (iIndex < 6)
{
iFixed = (int)Constant.aFixedLength[iIndex];
iLevel = (int)Constant.aRemap[iIndex] + bitIO.GetBit16((uint)iFixed);
}
else
{
iFixed = (int)bitIO.GetBit16(4) + 4;
if (iFixed == 19)
{
iFixed += bitIO.GetBit16(2);
if (iFixed == 22)
{
iFixed += bitIO.GetBit16(3);
}
}
iLevel = 2 + (1 << (byte)iFixed);
iIndex = bitIO.GetBit32((uint)iFixed);
iLevel += (int)iIndex;
}
return iLevel;
}
private void DecodeFirstIndex(out int pIndex, out int pSign, CAdaptiveHuffman pAHexpt)
{
pIndex = pAHexpt.GetHuff(bitIO);
pAHexpt.m_iDiscriminant += pAHexpt.m_pDelta[(uint)pIndex];
pAHexpt.m_iDiscriminant1 += pAHexpt.m_pDelta1[(uint)pIndex];
pSign = -bitIO.GetBit16(1);
}