/*! * \copy *     Copyright (c)  2009-2013, Cisco Systems *     All rights reserved. * *     Redistribution and use in source and binary forms, with or without *     modification, are permitted provided that the following conditions *     are met: * *        * Redistributions of source code must retain the above copyright *          notice, this list of conditions and the following disclaimer. * *        * Redistributions in binary form must reproduce the above copyright *          notice, this list of conditions and the following disclaimer in *          the documentation and/or other materials provided with the *          distribution. * *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS *     "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT *     LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS *     FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE *     COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, *     INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, *     BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER *     CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT *     LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN *     ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE *     POSSIBILITY OF SUCH DAMAGE. * * * \file    rec_mb.c * * \brief   implementation for all macroblock decoding process after mb syntax parsing and residual decoding with cavlc. * * \date    3/18/2009 Created * ************************************************************************************* */  #include "rec_mb.h"#include "decode_slice.h" namespace WelsDec { void WelsFillRecNeededMbInfo (PWelsDecoderContext pCtx, bool bOutput, PDqLayer pCurLayer) {  PPicture pCurPic = pCtx->pDec;  int32_t iLumaStride   = pCurPic->iLinesize[0];  int32_t iChromaStride = pCurPic->iLinesize[1];  int32_t iMbX = pCurLayer->iMbX;  int32_t iMbY = pCurLayer->iMbY;   pCurLayer->iLumaStride = iLumaStride;  pCurLayer->iChromaStride = iChromaStride;   if (bOutput) {    pCurLayer->pPred[0] = pCurPic->pData[0] + ((iMbY * iLumaStride + iMbX) << 4);    pCurLayer->pPred[1] = pCurPic->pData[1] + ((iMbY * iChromaStride + iMbX) << 3);    pCurLayer->pPred[2] = pCurPic->pData[2] + ((iMbY * iChromaStride + iMbX) << 3);  }} int32_t RecI8x8Mb (int32_t iMbXy, PWelsDecoderContext pCtx, int16_t* pScoeffLevel, PDqLayer pDqLayer) {  RecI8x8Luma (iMbXy, pCtx, pScoeffLevel, pDqLayer);  RecI4x4Chroma (iMbXy, pCtx, pScoeffLevel, pDqLayer);  return ERR_NONE;} int32_t RecI8x8Luma (int32_t iMbXy, PWelsDecoderContext pCtx, int16_t* pScoeffLevel, PDqLayer pDqLayer) {  /*****get local variable from outer variable********/  /*prediction info*/  uint8_t* pPred = pDqLayer->pPred[0];   int32_t iLumaStride = pDqLayer->iLumaStride;  int32_t* pBlockOffset = pCtx->iDecBlockOffsetArray;  PGetIntraPred8x8Func* pGetI8x8LumaPredFunc = pCtx->pGetI8x8LumaPredFunc;   int8_t* pIntra8x8PredMode = pDqLayer->pIntra4x4FinalMode[iMbXy]; // I_NxN  int16_t* pRS = pScoeffLevel;  /*itransform info*/  PIdctResAddPredFunc pIdctResAddPredFunc = pCtx->pIdctResAddPredFunc8x8;   /*************local variable********************/  uint8_t i = 0;  bool bTLAvail[4], bTRAvail[4];  // Top-Right : Left : Top-Left : Top  bTLAvail[0] = !! (pDqLayer->pIntraNxNAvailFlag[iMbXy] & 0x02);  bTLAvail[1] = !! (pDqLayer->pIntraNxNAvailFlag[iMbXy] & 0x01);  bTLAvail[2] = !! (pDqLayer->pIntraNxNAvailFlag[iMbXy] & 0x04);  bTLAvail[3] = true;   bTRAvail[0] = !! (pDqLayer->pIntraNxNAvailFlag[iMbXy] & 0x01);  bTRAvail[1] = !! (pDqLayer->pIntraNxNAvailFlag[iMbXy] & 0x08);  bTRAvail[2] = true;  bTRAvail[3] = false;   /*************real process*********************/  for (i = 0; i < 4; i++) {     uint8_t* pPredI8x8 = pPred + pBlockOffset[i << 2];    uint8_t uiMode = pIntra8x8PredMode[g_kuiScan4[i << 2]];     pGetI8x8LumaPredFunc[uiMode] (pPredI8x8, iLumaStride, bTLAvail[i], bTRAvail[i]);     int32_t iIndex = g_kuiMbCountScan4Idx[i << 2];    if (pDqLayer->pNzc[iMbXy][iIndex] || pDqLayer->pNzc[iMbXy][iIndex + 1] || pDqLayer->pNzc[iMbXy][iIndex + 4]        || pDqLayer->pNzc[iMbXy][iIndex + 5]) {      int16_t* pRSI8x8 = &pRS[i << 6];      pIdctResAddPredFunc (pPredI8x8, iLumaStride, pRSI8x8);    }  }   return ERR_NONE;} int32_t RecI4x4Mb (int32_t iMBXY, PWelsDecoderContext pCtx, int16_t* pScoeffLevel, PDqLayer pDqLayer) {  RecI4x4Luma (iMBXY, pCtx, pScoeffLevel, pDqLayer);  RecI4x4Chroma (iMBXY, pCtx, pScoeffLevel, pDqLayer);  return ERR_NONE;}  int32_t RecI4x4Luma (int32_t iMBXY, PWelsDecoderContext pCtx, int16_t* pScoeffLevel, PDqLayer pDqLayer) {  /*****get local variable from outer variable********/  /*prediction info*/  uint8_t* pPred = pDqLayer->pPred[0];   int32_t iLumaStride = pDqLayer->iLumaStride;  int32_t* pBlockOffset = pCtx->iDecBlockOffsetArray;  PGetIntraPredFunc* pGetI4x4LumaPredFunc = pCtx->pGetI4x4LumaPredFunc;   int8_t* pIntra4x4PredMode = pDqLayer->pIntra4x4FinalMode[iMBXY];  int16_t* pRS = pScoeffLevel;  /*itransform info*/  PIdctResAddPredFunc pIdctResAddPredFunc = pCtx->pIdctResAddPredFunc;    /*************local variable********************/  uint8_t i = 0;   /*************real process*********************/  for (i = 0; i < 16; i++) {     uint8_t* pPredI4x4 = pPred + pBlockOffset[i];    uint8_t uiMode = pIntra4x4PredMode[g_kuiScan4[i]];     pGetI4x4LumaPredFunc[uiMode] (pPredI4x4, iLumaStride);     if (pDqLayer->pNzc[iMBXY][g_kuiMbCountScan4Idx[i]]) {      int16_t* pRSI4x4 = &pRS[i << 4];      pIdctResAddPredFunc (pPredI4x4, iLumaStride, pRSI4x4);    }  }   return ERR_NONE;}  int32_t RecI4x4Chroma (int32_t iMBXY, PWelsDecoderContext pCtx, int16_t* pScoeffLevel, PDqLayer pDqLayer) {  int32_t iChromaStride = pCtx->pCurDqLayer->pDec->iLinesize[1];   int8_t iChromaPredMode = pDqLayer->pChromaPredMode[iMBXY];   PGetIntraPredFunc* pGetIChromaPredFunc = pCtx->pGetIChromaPredFunc;   uint8_t* pPred = pDqLayer->pPred[1];   pGetIChromaPredFunc[iChromaPredMode] (pPred, iChromaStride);  pPred = pDqLayer->pPred[2];  pGetIChromaPredFunc[iChromaPredMode] (pPred, iChromaStride);   RecChroma (iMBXY, pCtx, pScoeffLevel, pDqLayer);   return ERR_NONE;}  int32_t RecI16x16Mb (int32_t iMBXY, PWelsDecoderContext pCtx, int16_t* pScoeffLevel, PDqLayer pDqLayer) {  /*decoder use, encoder no use*/  int8_t iI16x16PredMode = pDqLayer->pIntraPredMode[iMBXY][7];  int8_t iChromaPredMode = pDqLayer->pChromaPredMode[iMBXY];  PGetIntraPredFunc* pGetIChromaPredFunc = pCtx->pGetIChromaPredFunc;  PGetIntraPredFunc* pGetI16x16LumaPredFunc = pCtx->pGetI16x16LumaPredFunc;  int32_t iUVStride = pCtx->pCurDqLayer->pDec->iLinesize[1];   /*common use by decoder&encoder*/  int32_t iYStride = pDqLayer->iLumaStride;  int16_t* pRS = pScoeffLevel;   uint8_t* pPred = pDqLayer->pPred[0];   PIdctFourResAddPredFunc pIdctFourResAddPredFunc = pCtx->pIdctFourResAddPredFunc;   /*decode i16x16 y*/  pGetI16x16LumaPredFunc[iI16x16PredMode] (pPred, iYStride);   /*1 mb is divided 16 4x4_block to idct*/  const int8_t* pNzc = pDqLayer->pNzc[iMBXY];  pIdctFourResAddPredFunc (pPred + 0 * iYStride + 0, iYStride, pRS + 0 * 64, pNzc +  0);  pIdctFourResAddPredFunc (pPred + 0 * iYStride + 8, iYStride, pRS + 1 * 64, pNzc +  2);  pIdctFourResAddPredFunc (pPred + 8 * iYStride + 0, iYStride, pRS + 2 * 64, pNzc +  8);  pIdctFourResAddPredFunc (pPred + 8 * iYStride + 8, iYStride, pRS + 3 * 64, pNzc + 10);   /*decode intra mb cb&cr*/  pPred = pDqLayer->pPred[1];  pGetIChromaPredFunc[iChromaPredMode] (pPred, iUVStride);  pPred = pDqLayer->pPred[2];  pGetIChromaPredFunc[iChromaPredMode] (pPred, iUVStride);  RecChroma (iMBXY, pCtx, pScoeffLevel, pDqLayer);   return ERR_NONE;}  //according to current 8*8 block ref_index to gain reference picturestatic inline void GetRefPic (sMCRefMember* pMCRefMem, PWelsDecoderContext pCtx, int8_t* pRefIdxList,                              int32_t iIndex) {  PPicture pRefPic;   int8_t iRefIdx = pRefIdxList[iIndex];  pRefPic = pCtx->sRefPic.pRefList[LIST_0][iRefIdx];   pMCRefMem->iSrcLineLuma   = pRefPic->iLinesize[0];  pMCRefMem->iSrcLineChroma = pRefPic->iLinesize[1];   pMCRefMem->pSrcY = pRefPic->pData[0];  pMCRefMem->pSrcU = pRefPic->pData[1];  pMCRefMem->pSrcV = pRefPic->pData[2];}  #ifndef MC_FLOW_SIMPLE_JUDGE#define MC_FLOW_SIMPLE_JUDGE 1#endif //MC_FLOW_SIMPLE_JUDGEvoid BaseMC (sMCRefMember* pMCRefMem, int32_t iXOffset, int32_t iYOffset, SMcFunc* pMCFunc,             int32_t iBlkWidth, int32_t iBlkHeight, int16_t iMVs[2]) {  int32_t iFullMVx = (iXOffset << 2) + iMVs[0]; //quarter pixel  int32_t iFullMVy = (iYOffset << 2) + iMVs[1];  iFullMVx = WELS_CLIP3 (iFullMVx, ((-PADDING_LENGTH + 2) * (1 << 2)), ((pMCRefMem->iPicWidth + PADDING_LENGTH - 19) * (1 << 2)));  iFullMVy = WELS_CLIP3 (iFullMVy, ((-PADDING_LENGTH + 2) * (1 << 2)), ((pMCRefMem->iPicHeight + PADDING_LENGTH - 19) * (1 << 2)));   int32_t iSrcPixOffsetLuma = (iFullMVx >> 2) + (iFullMVy >> 2) * pMCRefMem->iSrcLineLuma;  int32_t iSrcPixOffsetChroma = (iFullMVx >> 3) + (iFullMVy >> 3) * pMCRefMem->iSrcLineChroma;   int32_t iBlkWidthChroma = iBlkWidth >> 1;  int32_t iBlkHeightChroma = iBlkHeight >> 1;   uint8_t* pSrcY = pMCRefMem->pSrcY + iSrcPixOffsetLuma;  uint8_t* pSrcU = pMCRefMem->pSrcU + iSrcPixOffsetChroma;  uint8_t* pSrcV = pMCRefMem->pSrcV + iSrcPixOffsetChroma;  uint8_t* pDstY = pMCRefMem->pDstY;  uint8_t* pDstU = pMCRefMem->pDstU;  uint8_t* pDstV = pMCRefMem->pDstV;   pMCFunc->pMcLumaFunc (pSrcY, pMCRefMem->iSrcLineLuma, pDstY, pMCRefMem->iDstLineLuma, iFullMVx, iFullMVy, iBlkWidth,                        iBlkHeight);  pMCFunc->pMcChromaFunc (pSrcU, pMCRefMem->iSrcLineChroma, pDstU, pMCRefMem->iDstLineChroma, iFullMVx, iFullMVy,                          iBlkWidthChroma, iBlkHeightChroma);  pMCFunc->pMcChromaFunc (pSrcV, pMCRefMem->iSrcLineChroma, pDstV, pMCRefMem->iDstLineChroma, iFullMVx, iFullMVy,                          iBlkWidthChroma, iBlkHeightChroma); } void WeightPrediction (PDqLayer pCurDqLayer, sMCRefMember* pMCRefMem, int32_t iRefIdx, int32_t iBlkWidth,                       int32_t iBlkHeight) {    int32_t iLog2denom, iWoc, iOoc;  int32_t iPredTemp, iLineStride;  int32_t iPixel = 0;  uint8_t* pDst;  //luma  iLog2denom = pCurDqLayer->pPredWeightTable->uiLumaLog2WeightDenom;  iWoc = pCurDqLayer->pPredWeightTable->sPredList[LIST_0].iLumaWeight[iRefIdx];  iOoc = pCurDqLayer->pPredWeightTable->sPredList[LIST_0].iLumaOffset[iRefIdx];  iLineStride = pMCRefMem->iDstLineLuma;   for (int i = 0; i < iBlkHeight; i++) {    for (int j = 0; j < iBlkWidth; j++) {      iPixel = j + i * (iLineStride);      if (iLog2denom >= 1) {        iPredTemp = ((pMCRefMem->pDstY[iPixel] * iWoc + (1 << (iLog2denom - 1))) >> iLog2denom) + iOoc;         pMCRefMem->pDstY[iPixel] = WELS_CLIP3 (iPredTemp, 0, 255);      } else {        iPredTemp = pMCRefMem->pDstY[iPixel] * iWoc + iOoc;         pMCRefMem->pDstY[iPixel] = WELS_CLIP3 (iPredTemp, 0, 255);       }    }  }    //UV  iBlkWidth = iBlkWidth >> 2;  iBlkHeight = iBlkHeight >> 2;  iLog2denom = pCurDqLayer->pPredWeightTable->uiChromaLog2WeightDenom;  iLineStride = pMCRefMem->iDstLineChroma;   for (int i = 0; i < 2; i++) {      //iLog2denom = pCurDqLayer->pPredWeightTable->uiChromaLog2WeightDenom;    iWoc =  pCurDqLayer->pPredWeightTable->sPredList[LIST_0].iChromaWeight[iRefIdx][i];    iOoc = pCurDqLayer->pPredWeightTable->sPredList[LIST_0].iChromaOffset[iRefIdx][i];    pDst = i ? pMCRefMem->pDstV : pMCRefMem->pDstU;    //iLineStride = pMCRefMem->iDstLineChroma;     for (int i = 0; i < iBlkHeight ; i++) {      for (int j = 0; j < iBlkWidth; j++) {        iPixel = j + i * (iLineStride);        if (iLog2denom >= 1) {          iPredTemp = ((pDst[iPixel] * iWoc + (1 << (iLog2denom - 1))) >> iLog2denom) + iOoc;           pDst[iPixel] = WELS_CLIP3 (iPredTemp, 0, 255);        } else {          iPredTemp = pDst[iPixel] * iWoc + iOoc;           pDst[iPixel] = WELS_CLIP3 (iPredTemp, 0, 255);         }      }     }    }}  void GetInterPred (uint8_t* pPredY, uint8_t* pPredCb, uint8_t* pPredCr, PWelsDecoderContext pCtx) {  sMCRefMember pMCRefMem;  PDqLayer pCurDqLayer = pCtx->pCurDqLayer;  SMcFunc* pMCFunc = &pCtx->sMcFunc;   int32_t iMBXY = pCurDqLayer->iMbXyIndex;   int16_t iMVs[2] = {0};   int32_t iMBType = pCurDqLayer->pMbType[iMBXY];   int32_t iMBOffsetX = pCurDqLayer->iMbX << 4;  int32_t iMBOffsetY = pCurDqLayer->iMbY << 4;   int32_t iDstLineLuma   = pCtx->pDec->iLinesize[0];  int32_t iDstLineChroma = pCtx->pDec->iLinesize[1];   int32_t iBlk8X, iBlk8Y, iBlk4X, iBlk4Y, i, j, iIIdx, iJIdx;   pMCRefMem.iPicWidth = (pCurDqLayer->sLayerInfo.sSliceInLayer.sSliceHeaderExt.sSliceHeader.iMbWidth << 4);  pMCRefMem.iPicHeight = (pCurDqLayer->sLayerInfo.sSliceInLayer.sSliceHeaderExt.sSliceHeader.iMbHeight << 4);   pMCRefMem.pDstY = pPredY;  pMCRefMem.pDstU = pPredCb;  pMCRefMem.pDstV = pPredCr;   pMCRefMem.iDstLineLuma   = iDstLineLuma;  pMCRefMem.iDstLineChroma = iDstLineChroma;   int32_t iRefIndex = 0;   switch (iMBType) {  case MB_TYPE_SKIP:  case MB_TYPE_16x16:    iMVs[0] = pCurDqLayer->pMv[0][iMBXY][0][0];    iMVs[1] = pCurDqLayer->pMv[0][iMBXY][0][1];    GetRefPic (&pMCRefMem, pCtx, pCurDqLayer->pRefIndex[0][iMBXY], 0);    BaseMC (&pMCRefMem, iMBOffsetX, iMBOffsetY, pMCFunc, 16, 16, iMVs);     if (pCurDqLayer->bUseWeightPredictionFlag) {      iRefIndex = pCurDqLayer->pRefIndex[0][iMBXY][0];      WeightPrediction (pCurDqLayer, &pMCRefMem, iRefIndex, 16, 16);    }    break;  case MB_TYPE_16x8:    iMVs[0] = pCurDqLayer->pMv[0][iMBXY][0][0];    iMVs[1] = pCurDqLayer->pMv[0][iMBXY][0][1];    GetRefPic (&pMCRefMem, pCtx, pCurDqLayer->pRefIndex[0][iMBXY], 0);    BaseMC (&pMCRefMem, iMBOffsetX, iMBOffsetY, pMCFunc, 16, 8, iMVs);     if (pCurDqLayer->bUseWeightPredictionFlag) {      iRefIndex = pCurDqLayer->pRefIndex[0][iMBXY][0];      WeightPrediction (pCurDqLayer, &pMCRefMem, iRefIndex, 16, 8);    }     iMVs[0] = pCurDqLayer->pMv[0][iMBXY][8][0];    iMVs[1] = pCurDqLayer->pMv[0][iMBXY][8][1];    GetRefPic (&pMCRefMem, pCtx, pCurDqLayer->pRefIndex[0][iMBXY], 8);    pMCRefMem.pDstY = pPredY  + (iDstLineLuma << 3);    pMCRefMem.pDstU = pPredCb + (iDstLineChroma << 2);    pMCRefMem.pDstV = pPredCr + (iDstLineChroma << 2);    BaseMC (&pMCRefMem, iMBOffsetX, iMBOffsetY + 8, pMCFunc, 16, 8, iMVs);     if (pCurDqLayer->bUseWeightPredictionFlag) {      iRefIndex = pCurDqLayer->pRefIndex[0][iMBXY][8];      WeightPrediction (pCurDqLayer, &pMCRefMem, iRefIndex, 16, 8);    }    break;  case MB_TYPE_8x16:    iMVs[0] = pCurDqLayer->pMv[0][iMBXY][0][0];    iMVs[1] = pCurDqLayer->pMv[0][iMBXY][0][1];    GetRefPic (&pMCRefMem, pCtx, pCurDqLayer->pRefIndex[0][iMBXY], 0);    BaseMC (&pMCRefMem, iMBOffsetX, iMBOffsetY, pMCFunc, 8, 16, iMVs);    if (pCurDqLayer->bUseWeightPredictionFlag) {      iRefIndex = pCurDqLayer->pRefIndex[0][iMBXY][0];      WeightPrediction (pCurDqLayer, &pMCRefMem, iRefIndex, 8, 16);    }     iMVs[0] = pCurDqLayer->pMv[0][iMBXY][2][0];    iMVs[1] = pCurDqLayer->pMv[0][iMBXY][2][1];    GetRefPic (&pMCRefMem, pCtx, pCurDqLayer->pRefIndex[0][iMBXY], 2);    pMCRefMem.pDstY = pPredY + 8;    pMCRefMem.pDstU = pPredCb + 4;    pMCRefMem.pDstV = pPredCr + 4;    BaseMC (&pMCRefMem, iMBOffsetX + 8, iMBOffsetY, pMCFunc, 8, 16, iMVs);     if (pCurDqLayer->bUseWeightPredictionFlag) {      iRefIndex = pCurDqLayer->pRefIndex[0][iMBXY][2];      WeightPrediction (pCurDqLayer, &pMCRefMem, iRefIndex, 8, 16);    }    break;  case MB_TYPE_8x8:  case MB_TYPE_8x8_REF0: {    uint32_t iSubMBType;    int32_t iXOffset, iYOffset;    uint8_t* pDstY, *pDstU, *pDstV;    for (i = 0; i < 4; i++) {      iSubMBType = pCurDqLayer->pSubMbType[iMBXY][i];      iBlk8X = (i & 1) << 3;      iBlk8Y = (i >> 1) << 3;      iXOffset = iMBOffsetX + iBlk8X;      iYOffset = iMBOffsetY + iBlk8Y;       iIIdx = ((i >> 1) << 3) + ((i & 1) << 1);      GetRefPic (&pMCRefMem, pCtx, pCurDqLayer->pRefIndex[0][iMBXY], iIIdx);      iRefIndex = pCurDqLayer->bUseWeightPredictionFlag ? pCurDqLayer->pRefIndex[0][iMBXY][iIIdx] : 0;       pDstY = pPredY + iBlk8X + iBlk8Y * iDstLineLuma;      pDstU = pPredCb + (iBlk8X >> 1) + (iBlk8Y >> 1) * iDstLineChroma;      pDstV = pPredCr + (iBlk8X >> 1) + (iBlk8Y >> 1) * iDstLineChroma;      pMCRefMem.pDstY = pDstY;      pMCRefMem.pDstU = pDstU;      pMCRefMem.pDstV = pDstV;      switch (iSubMBType) {      case SUB_MB_TYPE_8x8:        iMVs[0] = pCurDqLayer->pMv[0][iMBXY][iIIdx][0];        iMVs[1] = pCurDqLayer->pMv[0][iMBXY][iIIdx][1];        BaseMC (&pMCRefMem, iXOffset, iYOffset, pMCFunc, 8, 8, iMVs);        if (pCurDqLayer->bUseWeightPredictionFlag) {           WeightPrediction (pCurDqLayer, &pMCRefMem, iRefIndex, 8, 8);        }         break;      case SUB_MB_TYPE_8x4:        iMVs[0] = pCurDqLayer->pMv[0][iMBXY][iIIdx][0];        iMVs[1] = pCurDqLayer->pMv[0][iMBXY][iIIdx][1];        BaseMC (&pMCRefMem, iXOffset, iYOffset, pMCFunc, 8, 4, iMVs);        if (pCurDqLayer->bUseWeightPredictionFlag) {           WeightPrediction (pCurDqLayer, &pMCRefMem, iRefIndex, 8, 4);        }          iMVs[0] = pCurDqLayer->pMv[0][iMBXY][iIIdx + 4][0];        iMVs[1] = pCurDqLayer->pMv[0][iMBXY][iIIdx + 4][1];        pMCRefMem.pDstY += (iDstLineLuma << 2);        pMCRefMem.pDstU += (iDstLineChroma << 1);        pMCRefMem.pDstV += (iDstLineChroma << 1);        BaseMC (&pMCRefMem, iXOffset, iYOffset + 4, pMCFunc, 8, 4, iMVs);        if (pCurDqLayer->bUseWeightPredictionFlag) {           WeightPrediction (pCurDqLayer, &pMCRefMem, iRefIndex, 8, 4);        }         break;      case SUB_MB_TYPE_4x8:        iMVs[0] = pCurDqLayer->pMv[0][iMBXY][iIIdx][0];        iMVs[1] = pCurDqLayer->pMv[0][iMBXY][iIIdx][1];        BaseMC (&pMCRefMem, iXOffset, iYOffset, pMCFunc, 4, 8, iMVs);        if (pCurDqLayer->bUseWeightPredictionFlag) {           WeightPrediction (pCurDqLayer, &pMCRefMem, iRefIndex, 4, 8);        }          iMVs[0] = pCurDqLayer->pMv[0][iMBXY][iIIdx + 1][0];        iMVs[1] = pCurDqLayer->pMv[0][iMBXY][iIIdx + 1][1];        pMCRefMem.pDstY += 4;        pMCRefMem.pDstU += 2;        pMCRefMem.pDstV += 2;        BaseMC (&pMCRefMem, iXOffset + 4, iYOffset, pMCFunc, 4, 8, iMVs);        if (pCurDqLayer->bUseWeightPredictionFlag) {           WeightPrediction (pCurDqLayer, &pMCRefMem, iRefIndex, 4, 8);        }         break;

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