mode_decision.c

h.264 影像壓縮 必須在 .net 的環境 下操作

    {
      *best_pdir = 2;
      *cost += bmcost[BI_PRED];
    }
  }
  else
  {
    img->bi_pred_me[mode]=0;
    *bi_pred_me = 0;
    //--- get prediction direction ----
    if  (bmcost[LIST_0] <= bmcost[LIST_1]
      && bmcost[LIST_0] <= bmcost[BI_PRED]
      && bmcost[LIST_0] <= bmcost[BI_PRED_L0]
      && bmcost[LIST_0] <= bmcost[BI_PRED_L1])
    {
      *best_pdir = 0;
      *cost += bmcost[LIST_0];
      //best_ref[LIST_1] = 0;
    }
    else if (bmcost[LIST_1] <= bmcost[LIST_0]
      &&     bmcost[LIST_1] <= bmcost[BI_PRED]
      &&     bmcost[LIST_1] <= bmcost[BI_PRED_L0]
      &&     bmcost[LIST_1] <= bmcost[BI_PRED_L1])
    {
      *best_pdir = 1;
      *cost += bmcost[LIST_1];
      //best_ref[LIST_0] = 0;
    }
    else if (bmcost[BI_PRED] <= bmcost[LIST_0]
      &&     bmcost[BI_PRED] <= bmcost[LIST_1]
      &&     bmcost[BI_PRED] <= bmcost[BI_PRED_L0]
      &&     bmcost[BI_PRED] <= bmcost[BI_PRED_L1])
    {
      *best_pdir = 2;
      *cost += bmcost[BI_PRED];
      //best_ref[LIST_1] = 0;
    }
    else if (bmcost[BI_PRED_L0] <= bmcost[LIST_0]
      &&     bmcost[BI_PRED_L0] <= bmcost[LIST_1]
      &&     bmcost[BI_PRED_L0] <= bmcost[BI_PRED]
      &&     bmcost[BI_PRED_L0] <= bmcost[BI_PRED_L1])
    {
      *best_pdir = 2;
      *cost += bmcost[BI_PRED_L0];
      *bi_pred_me = 1;
      img->bi_pred_me[mode]=1;
      best_ref[LIST_1] = 0;
      best_ref[LIST_0] = 0;
    }
    else
    {
      *best_pdir = 2;
      *cost += bmcost[BI_PRED_L1];
      *bi_pred_me = 2;
      best_ref[LIST_1] = 0;
      best_ref[LIST_0] = 0;
      img->bi_pred_me[mode]=2;
    }
  }
}

/*!
*************************************************************************************
* \brief
*    RD decision process
*************************************************************************************
*/
void compute_mode_RD_cost(int mode,
                          Macroblock *currMB,
                          RD_PARAMS enc_mb,
                          double *min_rdcost,
                          double *min_dcost,
                          double *min_rate,
                          int i16mode,
                          short bslice,
                          short *inter_skip)
{
  //--- transform size ---
  currMB->luma_transform_size_8x8_flag = input->Transform8x8Mode==2
    ?  (mode >= 1 && mode <= 3)
    || (mode == 0 && bslice && active_sps->direct_8x8_inference_flag)
    || ((mode == P8x8) && (enc_mb.valid[4]))
    :  0;
  //store_coding_state (currMB, cs_cm); // RD
  SetModesAndRefframeForBlocks (currMB, mode);

  // Encode with coefficients
  img->NoResidueDirect = 0;

  if ((input->FastCrIntraDecision )
    || (currMB->c_ipred_mode == DC_PRED_8 || (IS_INTRA(currMB) )))
  {
    while(1)
    {
      if (RDCost_for_macroblocks (currMB, enc_mb.lambda_md, mode, min_rdcost, min_dcost, min_rate, i16mode))
      {
        //Rate control
        if (input->RCEnable)
        {
          if(mode == P8x8)
            rc_store_diff(img->opix_x,img->opix_y, currMB->luma_transform_size_8x8_flag == 1 ? tr8x8.mpr8x8 : tr4x4.mpr8x8);
          else
            rc_store_diff(img->opix_x, img->opix_y, pred);
        }

        store_macroblock_parameters (currMB, mode);

        if(input->rdopt == 2 && mode == 0 && input->EarlySkipEnable)
        {
          // check transform quantized coeff.
          if(currMB->cbp == 0)
            *inter_skip = 1;
        }
      }

      // Go through transform modes.
      // Note that if currMB->cbp is 0 one could choose to skip 8x8 mode
      // although this could be due to deadzoning decisions.
      //if (input->Transform8x8Mode==1 && currMB->cbp!=0)
      if (input->Transform8x8Mode==1)
      {
        //=========== try mb_types 1,2,3 with 8x8 transform ===========
        if ((mode >= 1 && mode <= 3) && currMB->luma_transform_size_8x8_flag == 0)
        {
          //try with 8x8 transform size
          currMB->luma_transform_size_8x8_flag = 1;
          continue;
        }
        //=========== try DIRECT-MODE with 8x8 transform ===========
        else if (mode == 0 && bslice && active_sps->direct_8x8_inference_flag && currMB->luma_transform_size_8x8_flag == 0)
        {
          //try with 8x8 transform size
          currMB->luma_transform_size_8x8_flag = 1;
          continue;
        }
        //=========== try mb_type P8x8 for mode 4 with 4x4/8x8 transform ===========
        else if ((mode == P8x8) && (enc_mb.valid[4]) && (currMB->luma_transform_size_8x8_flag == 0))
        {
          currMB->luma_transform_size_8x8_flag = 1; //check 8x8 partition for transform size 8x8
          continue;
        }
        else
        {
          currMB->luma_transform_size_8x8_flag = 0;
          break;
        }
      }
      else
        break;
    }

    // Encode with no coefficients. Currently only for direct. This could be extended to all other modes as in example.
    //if (mode < P8x8 && (*inter_skip == 0) && enc_mb.valid[mode] && currMB->cbp && (currMB->cbp&15) != 15 && !input->nobskip)
    if ( bslice && mode == 0 && (*inter_skip == 0) && enc_mb.valid[mode] 
    && currMB->cbp && (currMB->cbp&15) != 15 && !input->nobskip
    &&  !(currMB->qp_scaled[0] == 0 && img->lossless_qpprime_flag==1) )
    {
      img->NoResidueDirect = 1;
      if (RDCost_for_macroblocks (currMB, enc_mb.lambda_md, mode, min_rdcost, min_dcost, min_rate, i16mode))
      {
        //Rate control
        if (input->RCEnable)
          rc_store_diff(img->opix_x,img->opix_y,pred);

        store_macroblock_parameters (currMB, mode);
      }
    }
  }
}


/*!
*************************************************************************************
* \brief
*    Mode Decision for an 8x8 sub-macroblock
*************************************************************************************
*/
void submacroblock_mode_decision(RD_PARAMS enc_mb,
                                 RD_8x8DATA *dataTr,
                                 Macroblock *currMB,
                                 int ***cofACtr,
                                 int ***cofACCbCrtr1, 
                                 int ***cofACCbCrtr2,
                                 int *have_direct,
                                 short bslice,
                                 int block,
                                 int *cost_direct,
                                 int *cost,
                                 int *cost8x8_direct,
                                 int transform8x8)
{
  int64 curr_cbp_blk;
  double min_rdcost, rdcost = 0.0;
  int j0, i0, j1, i1;
  int i,j, k;
  int min_cost8x8, index;
  int mode;
  int direct4x4_tmp, direct8x8_tmp;
  int bmcost[5] = {INT_MAX};
  int cnt_nonz = 0;
  int dummy;
  int best_cnt_nonz = 0;
  int maxindex =  (transform8x8) ? 2 : 5;
  int block_x, block_y;
  int lambda_mf[3];
  static int fadjust[16][16], fadjustCr[2][16][16];
  int ***fadjustTransform = transform8x8? img->fadjust8x8 : img->fadjust4x4;
  int ****fadjustTransformCr   = 
    (input->AdaptRndChroma || (img->yuv_format == YUV444 && !IS_INDEPENDENT(input) )) 
    ? (transform8x8 ? img->fadjust8x8Cr : img->fadjust4x4Cr):NULL;
  int lumaAdjustIndex   = transform8x8 ? 2 : 3;
  int chromaAdjustIndex = transform8x8 ? 0 : 2;
  short pdir;
  short bi_pred_me;

  char best_pdir = 0;
  char best_ref[2] = {0, -1};
  imgpel  (*curr_mpr)[16] = img->mpr[0];
#ifdef BEST_NZ_COEFF
  int best_nz_coeff[2][2];
#endif


  //--- set coordinates ---
  j0 = ((block>>1)<<3);
  j1 = (j0>>2);
  i0 = ((block&0x01)<<3);
  i1 = (i0>>2);

#ifdef BEST_NZ_COEFF
  for(j = 0; j <= 1; j++)
  {
    for(i = 0; i <= 1; i++)
      best_nz_coeff[i][j] = img->nz_coeff[img->current_mb_nr][i1 + i][j1 + j] = 0;
  }
#endif

  if (transform8x8)
    currMB->luma_transform_size_8x8_flag = 1; //switch to transform size 8x8

  //--- store coding state before coding ---
  store_coding_state (currMB, cs_cm);

  //=====  LOOP OVER POSSIBLE CODING MODES FOR 8x8 SUB-PARTITION  =====
  for (min_cost8x8=INT_MAX, min_rdcost=1e30, index=(bslice?0:1); index<maxindex; index++)
  {
    mode = b8_mode_table[index];
    *cost = 0;
    if (enc_mb.valid[mode] && (transform8x8 == 0 || mode != 0 || (mode == 0 && active_sps->direct_8x8_inference_flag)))
    {
      curr_cbp_blk = 0;

      if (mode==0)
      {
        //--- Direct Mode ---
        if (!input->rdopt )
        {
          direct4x4_tmp = 0;
          direct8x8_tmp = 0;
          direct4x4_tmp = GetDirectCost8x8 ( currMB, block, &direct8x8_tmp);

          if ((direct4x4_tmp==INT_MAX)||(*cost_direct==INT_MAX))
          {
            *cost_direct = INT_MAX;
            if (transform8x8)
              *cost8x8_direct = INT_MAX;
          }
          else
          {
            *cost_direct += direct4x4_tmp;
            if (transform8x8)
              *cost8x8_direct += direct8x8_tmp;
          }
          (*have_direct) ++;

          if (transform8x8)
          {
            switch(input->Transform8x8Mode)
            {
            case 1: // Mixture of 8x8 & 4x4 transform
              if((direct8x8_tmp < direct4x4_tmp) || !(enc_mb.valid[5] && enc_mb.valid[6] && enc_mb.valid[7]))
                *cost = direct8x8_tmp;
              else
                *cost = direct4x4_tmp;
              break;
            case 2: // 8x8 Transform only
              *cost = direct8x8_tmp;
              break;
            default: // 4x4 Transform only
              *cost = direct4x4_tmp;
              break;
            }
            if (input->Transform8x8Mode==2)
              *cost = INT_MAX;
          }
          else
          {
            *cost = direct4x4_tmp;
          }
        }

        block_x = img->block_x+(block&1)*2;
        block_y = img->block_y+(block&2);
        best_ref[LIST_0] = direct_ref_idx[LIST_0][block_y][block_x];
        best_ref[LIST_1] = direct_ref_idx[LIST_1][block_y][block_x];
        best_pdir        = direct_pdir[block_y][block_x];
      } // if (mode==0)
      else
      {
        //======= motion estimation for all reference frames ========
        //-----------------------------------------------------------
        lambda_mf[F_PEL] = (input->CtxAdptLagrangeMult == 0)
          ? enc_mb.lambda_mf[F_PEL] : (int)(enc_mb.lambda_mf[F_PEL] * lambda_mf_factor);

        lambda_mf[H_PEL] = (input->CtxAdptLagrangeMult == 0)
          ? enc_mb.lambda_mf[H_PEL] : (int)(enc_mb.lambda_mf[H_PEL] * lambda_mf_factor);

        lambda_mf[Q_PEL] = (input->CtxAdptLagrangeMult == 0)
          ? enc_mb.lambda_mf[Q_PEL] : (int)(enc_mb.lambda_mf[Q_PEL] * lambda_mf_factor);

        PartitionMotionSearch (currMB, mode, block, lambda_mf);

        //--- get cost and reference frame for LIST 0 prediction ---
        bmcost[LIST_0] = INT_MAX;
        list_prediction_cost(currMB, LIST_0, block, mode, enc_mb, bmcost, best_ref);

        //store LIST 0 reference index for every block
        block_x = img->block_x + (block & 0x01)*2;
        block_y = img->block_y + (block & 0x02);
        for (j = block_y; j< block_y + 2; j++)
        {
          for (i = block_x; i < block_x + 2; i++)
          {
            enc_picture->ref_idx   [LIST_0][j][i] = best_ref[LIST_0];
            enc_picture->ref_pic_id[LIST_0][j][i] =
              enc_picture->ref_pic_num[enc_mb.list_offset[LIST_0]][(short)best_ref[LIST_0]];
          }
        }

        if (bslice)
        {
          //--- get cost and reference frame for LIST 1 prediction ---
          bmcost[LIST_1] = INT_MAX;
          bmcost[BI_PRED] = INT_MAX;
          list_prediction_cost(currMB, LIST_1, block, mode, enc_mb, bmcost, best_ref);

          // Compute bipredictive cost between best list 0 and best list 1 references
          list_prediction_cost(currMB, BI_PRED, block, mode, enc_mb, bmcost, best_ref);

          //--- get prediction direction ----
          determine_prediction_list(mode, bmcost, best_ref, &best_pdir, cost, &bi_pred_me);

          //store backward reference index for every block