/* frequency domain inverse DCAC prediction */
Void predDCACDec(CWMImageStrCodec * pSC)
{
const COLORFORMAT cf = pSC->m_param.cfColorFormat;
const Int iChannels = (cf == YUV_420 || cf == YUV_422) ? 1 : (Int) pSC->m_param.cNumChannels;
CWMIMBInfo *pMBInfo = &(pSC->MBInfo);
size_t mbX = pSC->cColumn;// mbY = pSC->cRow;
Int iDCACPredMode = getDCACPredMode(pSC, mbX);
Int iDCPredMode = (iDCACPredMode & 0x3);
Int iADPredMode = (iDCACPredMode & 0xC);
PixelI * pOrg, * pRef;
Int ii;
for(ii = 0; ii < iChannels; ii ++){
pOrg = pMBInfo->iBlockDC[ii];//[dcBlkIdx + (i >> 4)]; // current DC block
/* DC prediction */
if(iDCPredMode == 1){ // predict DC from top
pOrg[0] += pSC->PredInfoPrevRow[ii][mbX].iDC;
}
else if(iDCPredMode == 0){ // predict DC from left
pOrg[0] += (pSC->PredInfo[ii] + mbX - 1)->iDC;
}
else if(iDCPredMode == 2){// predict DC from top&left
pOrg[0] += ((pSC->PredInfo[ii] + mbX - 1)->iDC + (pSC->PredInfoPrevRow[ii] + mbX)->iDC) >> 1;
}
/* AD prediction */
if(iADPredMode == 4){// predict AD from top
pRef = (pSC->PredInfoPrevRow[ii] + mbX)->piAD;
pOrg[4] += pRef[3], pOrg[8] += pRef[4], pOrg[12] += pRef[5];
}
else if(iADPredMode == 0){// predict AD from left
pRef = (pSC->PredInfo[ii] + mbX - 1)->piAD;
pOrg[1] += pRef[0], pOrg[2] += pRef[1], pOrg[3] += pRef[2];
}
}
/* frequency domain prediction */
Void predMacroblockEnc(CWMImageStrCodec * pSC)
{
const COLORFORMAT cf = pSC->m_param.cfColorFormat;
const Int iChannels = (cf == YUV_420 || cf == YUV_422) ? 1 : (Int) pSC->m_param.cNumChannels;
size_t mbX = pSC->cColumn - 1, mbY = pSC->cRow - 1;
CWMIMBInfo *pMBInfo = &(pSC->MBInfo);
Int iDCACPredMode = getDCACPredMode(pSC, mbX);
Int iDCPredMode = (iDCACPredMode & 0x3);
Int iADPredMode = (iDCACPredMode & 0xC);
Int iACPredMode = getACPredMode(pMBInfo, cf);
PixelI * pOrg, * pRef;
Int i, j, k;
pMBInfo->iOrientation = 2 - iACPredMode;
/* keep necessary info for future prediction */
updatePredInfo(pSC, pMBInfo, mbX, cf);
for(i = 0; i < iChannels; i ++){
pOrg = pMBInfo->iBlockDC[i]; // current DC block
/* DC prediction */
if(iDCPredMode == 1){ // predict DC from top
pOrg[0] -= (pSC->PredInfoPrevRow[i] + mbX)->iDC;
}
else if(iDCPredMode == 0){ // predict DC from left
pOrg[0] -= (pSC->PredInfo[i] + mbX - 1)->iDC;
}
else if(iDCPredMode == 2){// predict DC from top&left
pOrg[0] -= ((pSC->PredInfo[i] + mbX - 1)->iDC + (pSC->PredInfoPrevRow[i] + mbX)->iDC) >> 1;
}
/* AD prediction */
if(iADPredMode == 4){// predict AD from top
pRef = (pSC->PredInfoPrevRow[i] + mbX)->piAD;
pOrg[4] -= pRef[3], pOrg[8] -= pRef[4], pOrg[12] -= pRef[5];
}
else if(iADPredMode == 0){// predict AD from left
pRef = (pSC->PredInfo[i] + mbX - 1)->piAD;
pOrg[1] -= pRef[0], pOrg[2] -= pRef[1], pOrg[3] -= pRef[2];
}
pOrg = pSC->pPlane[i];
/* AC prediction */
if(iACPredMode == 1){ // predict from top
for(k = 0; k <= 192; k += 64){
/* inside macroblock, in reverse order */
for(j = 48; j > 0; j -= 16){
pOrg[k + j + 10] -= pOrg[k + j + 10 - 16];
pOrg[k + j + 2] -= pOrg[k + j + 2 - 16];
pOrg[k + j + 9] -= pOrg[k + j + 9 - 16];
}
}
}
else if(iACPredMode == 0){ // predict from left
for(k = 0; k < 64; k += 16){
/* inside macroblock, in reverse order */
for(j = 192; j > 0; j -= 64){
pOrg[k + j + 5] -= pOrg[k + j + 5 - 64];
pOrg[k + j + 1] -= pOrg[k + j + 1 - 64];
pOrg[k + j + 6] -= pOrg[k + j + 6 - 64];
}
}
}
}
