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JM86編碼器的一個(gè)主體框架：

Main()——>encode_one_frame——>frame_picture——>code_a_picture——>encode_one_slice——>encode_one_macroblock

Encode_one_macroblock（）幀內部分講解：

    if (input->rdopt)    //hainei_12_19_率失真

    {

      int mb_available_up;

      int mb_available_left;

      int mb_available_up_left;

      min_rdcost = max_rdcost;

      // precompute all new chroma intra prediction modes

           //++對色度進(jìn)行幀內預測,(并求出最優(yōu)模式hainei)

      IntraChromaPrediction8x8(&mb_available_up, &mb_available_left, &mb_available_up_left);

      

           //++分別在四種色度模式下進(jìn)行RDO計算，如果是inter模式，因為色度預測模式與SSD計算

           //++無(wú)關(guān)，因此只需要計算一次（利用currMB->c_ipred_mode == DC_PRED_8條件限制來(lái)實(shí)現）

      for (currMB->c_ipred_mode=DC_PRED_8; currMB->c_ipred_mode<=PLANE_8; currMB->c_ipred_mode++)

      {   //hainei_09_12_19_intra模式共9種預測模式

        // bypass if c_ipred_mode is not allowed

        if ((currMB->c_ipred_mode==VERT_PRED_8 && !mb_available_up) ||

          (currMB->c_ipred_mode==HOR_PRED_8 && !mb_available_left) ||

          (currMB->c_ipred_mode==PLANE_8 && (!mb_available_left || !mb_available_up || !mb_available_up_left)))

          continue;

        //===== GET BEST MACROBLOCK MODE =====

        for (ctr16x16=0, index=0; index<7; index++)

        {

          mode = mb_mode_table[index];

          

          //--- for INTER16x16 check all prediction directions ---

          if (mode==1 && img->type==B_SLICE)

          {

            best8x8pdir[1][0] = best8x8pdir[1][1] = best8x8pdir[1][2] = best8x8pdir[1][3] = ctr16x16;

            if (ctr16x16 < 2) index--;

            ctr16x16++;

          }

          img->NoResidueDirect = 0;

          if (valid[mode])

          {

            // bypass if c_ipred_mode not used

                            //++設置當前宏塊類(lèi)型以及其中每個(gè)8*8塊的分割方式和預測方向，每個(gè)4*4塊的參考幀索引

                            //++該函數在下面的RDCost_for_macroblocks函數內再次調用，進(jìn)行了重復操作

            SetModesAndRefframeForBlocks (mode);

            if (currMB->c_ipred_mode == DC_PRED_8 || //++利用這個(gè)條件限制來(lái)實(shí)現inter模式時(shí)只計算一次RDO

              (IS_INTRA(currMB) ))

            {

              if (RDCost_for_macroblocks (lambda_mode, mode, &min_rdcost))        //++幀內模式時(shí)亮度存在重復計算情況：因為色度預測模式與亮度預測模式無(wú)關(guān)，所以在該色度模

              {                                                                                               //++式循環(huán)中每次計算得到的intra16*16和intra4*4宏塊類(lèi)型的最佳亮度模式都是完全相同的

                //Rate control

                if(mode == P8x8)

                {

                  for (i=0; i<16; i++)

                    for(j=0; j<16; j++)

                      diffy[j][i] = imgY_org[img->opix_y+j][img->opix_x+i] - mpr8x8[j][i];

                }else

                {

                  for (i=0; i<16; i++)

                    for(j=0; j<16; j++)

                      diffy[j][i] = imgY_org[img->opix_y+j][img->opix_x+i] - pred[j][i];

                }

                store_macroblock_parameters(mode);       //hainei_09_12_20_存儲相關(guān)編碼信息

              }//hainei_10_01_23 if (RDCost_for_macroblocks (lambda_mode, mode, &min_rdcost))

            }// hainei_10_01_23  if (currMB->c_ipred_mode == DC_PRED_8

          }//hainei_10_01_23  if (valid[mode])

          

……

    set_stored_macroblock_parameters();   //在這里取出store_macroblock_paramepers()中存儲中數據

在RDCost_for_macroblocks求取最優(yōu)模式，如果其返回的rdcost小于之前的min-rdcost，則進(jìn)行最優(yōu)模式的更新。執行store_macroblock_parameters將當前的模式信息存儲起來(lái)，因為執行下一模式進(jìn)入RDCost_for_macroblocks后會(huì )將當前模式的一些數據覆蓋掉，比如img->cofAC等等。因此要將其保存起來(lái)。之后會(huì )在store_macroblock_parameters恢復。