1. {
    2.     WelsDecodeBs(pDstInfo)
    3.     {
    4.         ConstructAccessUnit()
    5.         {
    6.             DecodeCurrentAccessUnit()
    7.             {
    8.                 int32_t iIdx = pCurAu->uiStartPos;
    9.                 int32_t iEndIdx = pCurAu->uiEndPos;
    10.                 while (iIdx <= iEndIdx) 
    11.                 {
    12.                     /*
    13.                     *  Loop decoding for slices (even FMO and/ multiple slices) within a dq layer
    14.                     */
    15.                     while (iIdx <= iEndIdx)
    16.                     {
    17.                         WelsDecodeSlice()
    18.                         {
    19.                             WelsCabacContextInit()
    20.                             InitCabacDecEngineFromBS()
    21.                             do
    22.                             {
    23.                                 if ((-1 == iNextMbXyIndex) || (iNextMbXyIndex >= kiCountNumMb))
    24.                                 { // slice group boundary or end of a frame
    25.                                     break;
    26.                                 }
    27.                                 WelsDecodeMbCabacISlice()
    28.                                 {
    29.                                     WelsDecodeMbCabacISliceBaseMode0()
    30.                                     {//解析宏块，从MB_Type开始解析，到resi结束
    32.                                     }
    33.                                     if (pSliceHeader->pPps->uiNumSliceGroups > 1) {
    34.                                     iNextMbXyIndex = FmoNextMb (pFmo, iNextMbXyIndex);
    35.                                     } else {
    36.                                     ++iNextMbXyIndex;
    37.                                     }
    38.                                 }
    39.                             }while(1)
    40.                         }
    41.                         WelsDecodeConstructSlice(pCtx)//解码得到Y值
    42.                         {
    43.                             WelsTargetSliceConstruction(pCtx)//得到Y值
    45.                             do{
    46.                                 if (iCountNumMb >= iTotalNumMb) 
    47.                                 {
    48.                                     break;
    49.                                 }
    50.                                 WelsTargetMbConstruction(pCtx)//解码一个宏块得到Y值
    51.                                 {
    52.                                     if(MbType == MB_TYPE_INTRA_PCM)
    53.                                     {
    55.                                     }
    56.                                     else if(MbType == IS_INTRA)
    57.                                     {//帧内预测
    58.                                         PDqLayer pCurDqLayer = pCtx->pCurDqLayer;
    59.                                         WelsMbIntraPredictionConstruction(PWelsDecoderContext pCtx, PDqLayer pCurDqLayer, bool bOutput)//预测得到Y U V的值
    60.                                         {//根据pDqLayer->pPred获得YUV的值
    61.                                             //根据pCurDqLayer->pNzc[iMBXY]和pCurDqLayer->pScaledTCoeff
    62.                                             if (IS_INTRA16x16) 
    63.                                             {
    64.                                                 RecI16x16Mb(iMbXy, pCtx, pCurDqLayer->pScaledTCoeff[iMbXy], pCurDqLayer)   
    65.                                             } else if (IS_INTRA8x8) 
    66.                                             {
    67.                                                 RecI8x8Mb();
    68.                                             } else if (IS_INTRA4x4) {
    69.                                                 RecI4x4Mb();
    70.                                             }
    71.                                         }
    72.                                     }
    73.                                     else if(MbType == IS_INTER)
    74.                                     {
    75.                                         if (0 == pCurDqLayer->pCbp[pCurDqLayer->iMbXyIndex]) 
    76.                                         { //uiCbp==0 include SKIP
    77.                                             if (!CheckRefPics (pCtx)) {
    78.                                                 return ERR_INFO_MB_RECON_FAIL;
    79.                                             }
    80.                                             return WelsMbInterPrediction (pCtx, pCurDqLayer);
    81.                                         } 
    82.                                         else 
    83.                                         {
    84.                                             WelsMbInterConstruction (pCtx, pCurDqLayer);
    85.                                         }
    86.                                     }
    87.                                 }
    88.                             }while(1)
    89.                         }
    90.                     }
    91.                     DecodeFrameConstruction (pCtx, ppDst, pDstInfo);
    92.                 }
    93.             }
    94.         }
    96.     }
    97.     if (pDstInfo->iBufferStatus == 1)
    98.     for(int i = 0; i < 32; i++)
    99.     {//Y值
    100.         printf("%d ", pDstInfo->pDst[0][i]);
    101.     }
    102. }