md_low.c

压缩JM12.3d的完整的全部C语言的代码文档,用于嵌入式系统的压缩编解码

/*!
 ***************************************************************************
 * \file md_low.c
 *
 * \brief
 *    Main macroblock mode decision functions and helpers
 *
 **************************************************************************
 */

#include <stdlib.h>
#include <math.h>
#include <assert.h>
#include <limits.h>
#include <float.h>
#include <memory.h>
#include <string.h>

#include "global.h"
#include "rdopt_coding_state.h"
#include "mb_access.h"
#include "intrarefresh.h"
#include "image.h"
#include "transform8x8.h"
#include "ratectl.h"
#include "mode_decision.h"
#include "fmo.h"
#include "me_umhex.h"
#include "me_umhexsmp.h"
#include "macroblock.h"


//==== MODULE PARAMETERS ====
static imgpel temp_imgY[16][16]; // to temp store the Y data for 8x8 transform


/*!
*************************************************************************************
* \brief
*    Mode Decision for a macroblock
*************************************************************************************
*/
void encode_one_macroblock_low ()
{

  int         block, mode, i, j, k, dummy;
  char        best_pdir;
  RD_PARAMS   enc_mb;
  char        best_ref[2] = {0, -1};
  int         bmcost[5] = {INT_MAX};
  int         cost=0;
  int         min_cost = INT_MAX, cost_direct=0, have_direct=0, i16mode=0;
  int         intra1 = 0;
  int         temp_cpb = 0;
  int         best_transform_flag = 0;
  int         cost8x8_direct = 0;
  short       islice      = (short) (img->type==I_SLICE);
  short       bslice      = (short) (img->type==B_SLICE);
  short       pslice      = (short) ((img->type==P_SLICE) || (img->type==SP_SLICE));
  short       intra       = (short) (islice || (pslice && img->mb_y==img->mb_y_upd && img->mb_y_upd!=img->mb_y_intra));
  int         lambda_mf[3];
  int         pix_x, pix_y;
  Macroblock* currMB      = &img->mb_data[img->current_mb_nr];
  int         prev_mb_nr  = FmoGetPreviousMBNr(img->current_mb_nr);
  Macroblock* prevMB      = (prev_mb_nr >= 0) ? &img->mb_data[prev_mb_nr]:NULL ;

  char   **ipredmodes = img->ipredmode;
  short   *allmvs = img->all_mv[0][0][0][0][0];
  int     ****i4p;  //for non-RD-opt. mode

  int tmp_8x8_flag, tmp_no_mbpart;
  // Fast Mode Decision
  short inter_skip = 0;


  if(input->SearchMode == UM_HEX)
  {
    UMHEX_decide_intrabk_SAD();
  }
  else if (input->SearchMode == UM_HEX_SIMPLE)
  {
    smpUMHEX_decide_intrabk_SAD();
  }

  intra |= RandomIntra (img->current_mb_nr);    // Forced Pseudo-Random Intra

  //===== Setup Macroblock encoding parameters =====
  init_enc_mb_params(currMB, &enc_mb, intra, bslice);


  // reset chroma intra predictor to default
  currMB->c_ipred_mode = DC_PRED_8;

  //=====   S T O R E   C O D I N G   S T A T E   =====
  //---------------------------------------------------
  store_coding_state (cs_cm);

  if (!intra)
  {
    //===== set direct motion vectors =====
    best_mode = 1;
    if (bslice)
    {
      Get_Direct_Motion_Vectors ();
    }

    if (input->CtxAdptLagrangeMult == 1)
    {
      get_initial_mb16x16_cost();
    }

    //===== MOTION ESTIMATION FOR 16x16, 16x8, 8x16 BLOCKS =====
    for (min_cost=INT_MAX, mode=1; mode<4; mode++)
    {
      bi_pred_me = 0;
      img->bi_pred_me[mode]=0;
      if (enc_mb.valid[mode] && !inter_skip)
      {
        for (cost=0, block=0; block<(mode==1?1:2); block++)
        {
          update_lambda_costs(&enc_mb, lambda_mf);
          PartitionMotionSearch (mode, block, lambda_mf);

          //--- set 4x4 block indizes (for getting MV) ---
          j = (block==1 && mode==2 ? 2 : 0);
          i = (block==1 && mode==3 ? 2 : 0);

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

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

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

            // Finally, if mode 16x16, compute cost for bipredictive ME vectore
            if (input->BiPredMotionEstimation && mode == 1)
            {
              list_prediction_cost(BI_PRED_L0, block, mode, enc_mb, bmcost, 0);
              list_prediction_cost(BI_PRED_L1, block, mode, enc_mb, bmcost, 0);
            }
            else
            {
              bmcost[BI_PRED_L0] = INT_MAX;
              bmcost[BI_PRED_L1] = INT_MAX;
            }

            // Determine prediction list based on mode cost
            determine_prediction_list(mode, bmcost, best_ref, &best_pdir, &cost, &bi_pred_me);
          }
          else // if (bslice)
          {
            best_pdir  = 0;
            cost      += bmcost[LIST_0];
          }

          assign_enc_picture_params(mode, best_pdir, block, enc_mb.list_offset[LIST_0], best_ref[LIST_0], best_ref[LIST_1], bslice);

          //----- set reference frame and direction parameters -----
          if (mode==3)
          {
            best8x8l0ref [3][block  ] = best8x8l0ref [3][  block+2] = best_ref[LIST_0];
            best8x8pdir  [3][block  ] = best8x8pdir  [3][  block+2] = best_pdir;
            best8x8l1ref [3][block  ] = best8x8l1ref [3][  block+2] = best_ref[LIST_1];
          }
          else if (mode==2)
          {
            best8x8l0ref [2][2*block] = best8x8l0ref [2][2*block+1] = best_ref[LIST_0];
            best8x8pdir  [2][2*block] = best8x8pdir  [2][2*block+1] = best_pdir;
            best8x8l1ref [2][2*block] = best8x8l1ref [2][2*block+1] = best_ref[LIST_1];
          }
          else
          {
            memset(&best8x8l0ref [1][0], best_ref[LIST_0], 4 * sizeof(char));
            memset(&best8x8l1ref [1][0], best_ref[LIST_1], 4 * sizeof(char));
            best8x8pdir  [1][0] = best8x8pdir  [1][1] = best8x8pdir  [1][2] = best8x8pdir  [1][3] = best_pdir;
          }

          //--- set reference frames and motion vectors ---
          if (mode>1 && block==0)
            SetRefAndMotionVectors (block, mode, best_pdir, best_ref[LIST_0], best_ref[LIST_1]);
        } // for (block=0; block<(mode==1?1:2); block++)

        currMB->luma_transform_size_8x8_flag = 0;
        if (input->Transform8x8Mode) //for inter rd-off, set 8x8 to do 8x8 transform
        {
          SetModesAndRefframeForBlocks(mode);
          currMB->luma_transform_size_8x8_flag = TransformDecision(-1, &cost);
        }

        if ((!inter_skip) && (cost < min_cost))
        {
          best_mode = (short) mode;
          min_cost  = cost;
          best_transform_flag = currMB->luma_transform_size_8x8_flag;

          if (input->CtxAdptLagrangeMult == 1)
          {
            adjust_mb16x16_cost(cost);
          }
        }
      } // if (enc_mb.valid[mode])
    } // for (mode=1; mode<4; mode++)

    if ((!inter_skip) && enc_mb.valid[P8x8])
    {
      giRDOpt_B8OnlyFlag = 1;

      tr8x8.cost8x8 = INT_MAX;
      tr4x4.cost8x8 = INT_MAX;
      //===== store coding state of macroblock =====
      store_coding_state (cs_mb);

      currMB->all_blk_8x8 = -1;

      if (input->Transform8x8Mode)
      {
        tr8x8.cost8x8 = 0;
        //===========================================================
        // Check 8x8 partition with transform size 8x8
        //===========================================================
        //=====  LOOP OVER 8x8 SUB-PARTITIONS  (Motion Estimation & Mode Decision) =====
        for (cost_direct=cbp8x8=cbp_blk8x8=cnt_nonz_8x8=0, block=0; block<4; block++)
        {
          submacroblock_mode_decision(enc_mb, &tr8x8, currMB, cofAC_8x8ts[block],
            &have_direct, bslice, block, &cost_direct, &cost, &cost8x8_direct, 1);
          best8x8mode       [block] = tr8x8.part8x8mode [block];
          best8x8pdir [P8x8][block] = tr8x8.part8x8pdir [block];
          best8x8l0ref[P8x8][block] = tr8x8.part8x8l0ref[block];
          best8x8l1ref[P8x8][block] = tr8x8.part8x8l1ref[block];
        }

        // following params could be added in RD_8x8DATA structure
        cbp8_8x8ts      = cbp8x8;
        cbp_blk8_8x8ts  = cbp_blk8x8;
        cnt_nonz8_8x8ts = cnt_nonz_8x8;
        currMB->luma_transform_size_8x8_flag = 0; //switch to 4x4 transform size

        //--- re-set coding state (as it was before 8x8 block coding) ---
        //reset_coding_state (cs_mb);
      }// if (input->Transform8x8Mode)


      if (input->Transform8x8Mode != 2)
      {
        tr4x4.cost8x8 = 0;
        //=================================================================
        // Check 8x8, 8x4, 4x8 and 4x4 partitions with transform size 4x4
        //=================================================================
        //=====  LOOP OVER 8x8 SUB-PARTITIONS  (Motion Estimation & Mode Decision) =====
        for (cost_direct=cbp8x8=cbp_blk8x8=cnt_nonz_8x8=0, block=0; block<4; block++)
        {
          submacroblock_mode_decision(enc_mb, &tr4x4, currMB, cofAC8x8[block],
            &have_direct, bslice, block, &cost_direct, &cost, &cost8x8_direct, 0);

          best8x8mode       [block] = tr4x4.part8x8mode [block];
          best8x8pdir [P8x8][block] = tr4x4.part8x8pdir [block];
          best8x8l0ref[P8x8][block] = tr4x4.part8x8l0ref[block];
          best8x8l1ref[P8x8][block] = tr4x4.part8x8l1ref[block];
        }
        //--- re-set coding state (as it was before 8x8 block coding) ---
        // reset_coding_state (cs_mb);
      }// if (input->Transform8x8Mode != 2)

      //--- re-set coding state (as it was before 8x8 block coding) ---
      reset_coding_state (cs_mb);


      // This is not enabled yet since mpr has reverse order.
      if (input->RCEnable)
        rc_store_diff(img->opix_x,img->opix_y,img->mpr);

      //check cost for P8x8 for non-rdopt mode
      if (tr4x4.cost8x8 < min_cost || tr8x8.cost8x8 < min_cost)
      {
        best_mode = P8x8;
        if (input->Transform8x8Mode == 2)
        {
          min_cost = tr8x8.cost8x8;
          currMB->luma_transform_size_8x8_flag=1;
        }
        else if (input->Transform8x8Mode)
        {
          if (tr8x8.cost8x8 < tr4x4.cost8x8)
          {
            min_cost = tr8x8.cost8x8;
            currMB->luma_transform_size_8x8_flag=1;
          }
          else if(tr4x4.cost8x8 < tr8x8.cost8x8)
          {
            min_cost = tr4x4.cost8x8;
            currMB->luma_transform_size_8x8_flag=0;
          }
          else
          {
            if (GetBestTransformP8x8() == 0)
            {
              min_cost = tr4x4.cost8x8;
              currMB->luma_transform_size_8x8_flag=0;
            }
            else
            {
              min_cost = tr8x8.cost8x8;
              currMB->luma_transform_size_8x8_flag=1;