private void FormatQuantizer(ref CWMIQuantizer pQuantizer)
{
RemapQP(ref pQuantizer, Constant.SHIFTZERO);
}
/*************************************************************************
QPRemapping
*************************************************************************/
private void RemapQP(ref CWMIQuantizer pQP, int iShift)
{
byte uiQPIndex = pQP.iIndex;
if(uiQPIndex == 0)
{
throw new ArgumentOutOfRangeException("pQP", "uiQPIndex = " + uiQPIndex);
}
else if (!bScaledArith)
{
throw new ArgumentOutOfRangeException("pQP", "bScaledArith = " + bScaledArith);
}
else
{
int man = 0, exp = 0;
if (pQP.iIndex < 16)
{
man = pQP.iIndex;
exp = iShift;
}
else
{
man = 16 + (pQP.iIndex & 0xf);
exp = ((pQP.iIndex >> 4) - 1) + iShift;
}
pQP.iQP = man << exp;
pQP.iMan = Constant.gs_QPRecipTable[man].iMan;
pQP.iExp = Constant.gs_QPRecipTable[man].iExp + exp;
pQP.iOffset = ((pQP.iQP * 3 + 1) >> 3);
}
}
private void StrDecInit()
{
AllocatePredInfo();
if ((uQPMode & 1) == 0)
{ // DC frame uniform quantization
pQuantizerDC = new CWMIQuantizer();
pQuantizerDC.iIndex = uiQPIndexDC;
FormatQuantizer(ref pQuantizerDC);
}
if (sbSubband != SUBBAND.SB_DC_ONLY)
{
if ((uQPMode & 2) == 0)
{ // LP frame uniform quantization
pQuantizerLP = new CWMIQuantizer();
if ((uQPMode & 0x200) == 0) // use DC quantizer
{
throw new ArgumentOutOfRangeException("StrDecInit 1");
}
else
{
pQuantizerLP.iIndex = uiQPIndexLP;
FormatQuantizer(ref pQuantizerLP);
}
}
if (sbSubband != SUBBAND.SB_NO_HIGHPASS)
{
if ((uQPMode & 4) == 0)
{ // HP frame uniform quantization
pQuantizerHP = new CWMIQuantizer();
if ((uQPMode & 0x400) == 0) // use LP quantizer
{
throw new ArgumentOutOfRangeException("StrDecInit 2");
}
else
{
pQuantizerHP.iIndex = uiQPIndexHP;
FormatQuantizer(ref pQuantizerHP);
}
}
}
}
AllocateCodingContextDec();
}