macroblock.c

MPEG-4编解码的实现(包括MPEG4视音频编解码)

        currSE->mapping = levrun_linfo_inter;
      else
        currSE->writing = writeRunLevel2Buffer_CABAC;

      if (k == 0)
      {
        if (img->imod == INTRA_MB_OLD || img->imod == INTRA_MB_NEW)
        {
          currSE->context = 2; // for choosing context model
          currSE->type  = SE_LUM_DC_INTRA;
        }
        else
        {
          currSE->context = 1; // for choosing context model
          currSE->type  = SE_LUM_DC_INTER;
        }
      }
      else
      {
        if (img->imod == INTRA_MB_OLD || img->imod == INTRA_MB_NEW)
        {
          currSE->context = 2; // for choosing context model
          currSE->type  = SE_LUM_AC_INTRA;
        }
        else
        {
          currSE->context = 1; // for choosing context model
          currSE->type  = SE_LUM_AC_INTER;
        }
      }

      // choose the appropriate data partition
      if (img->type != B_IMG)
        dataPart = &(currSlice->partArr[partMap[currSE->type]]);
      else
        dataPart = &(currSlice->partArr[partMap[SE_BFRAME]]);

      dataPart->writeSyntaxElement (currSE, dataPart);
      bitCount[BITS_COEFF_Y_MB]+=currSE->len;
      no_bits                  +=currSE->len;
#if TRACE
      snprintf(currSE->tracestring, TRACESTRING_SIZE, "Luma sng(%2d) level =%3d run =%2d", k, level,run);
#endif
      // proceed to next SE
      currSE++;
      currMB->currSEnr++;

    }
  }

  return no_bits;
}





int
writeMB_bits_for_16x16_luma ()
{
  int           no_bits    = 0;
  Macroblock    *currMB    = &img->mb_data[img->current_mb_nr];
  SyntaxElement *currSE    = &img->MB_SyntaxElements[currMB->currSEnr];
  int           *bitCount  = currMB->bitcounter;
  Slice         *currSlice = img->currentSlice;
  DataPartition *dataPart;
  int           *partMap   = assignSE2partition[input->partition_mode];

  int level, run;
  int i, j, k, mb_x, mb_y;


  // DC coeffs
  level=1; // get inside loop
  for (k=0;k<=16 && level !=0;k++)
  {
    level = currSE->value1 = img->cof[0][0][k][0][1]; // level
    run   = currSE->value2 = img->cof[0][0][k][1][1]; // run

    if (input->symbol_mode == UVLC)
      currSE->mapping = levrun_linfo_inter;
    else
    {
      currSE->context = 3; // for choosing context model
      currSE->writing = writeRunLevel2Buffer_CABAC;
    }
    currSE->type  = SE_LUM_DC_INTRA;   // element is of type DC

    // choose the appropriate data partition
    if (img->type != B_IMG)
      dataPart = &(currSlice->partArr[partMap[currSE->type]]);
    else
      dataPart = &(currSlice->partArr[partMap[SE_BFRAME]]);

    dataPart->writeSyntaxElement (currSE, dataPart);
    bitCount[BITS_COEFF_Y_MB]+=currSE->len;
    no_bits                  +=currSE->len;
#if TRACE
    snprintf(currSE->tracestring, TRACESTRING_SIZE, "DC luma 16x16 sng(%2d) level =%3d run =%2d", k, level, run);
#endif

    // proceed to next SE
    currSE++;
    currMB->currSEnr++;
  }


  // AC coeffs
  if (img->kac==1)
  {
    for (mb_y=0; mb_y < 4; mb_y += 2)
    {
      for (mb_x=0; mb_x < 4; mb_x += 2)
      {
        for (j=mb_y; j < mb_y+2; j++)
        {
          for (i=mb_x; i < mb_x+2; i++)
          {
            level=1; // get inside loop
            for (k=0;k<16 && level !=0;k++)
            {
              level = currSE->value1 = img->cof[i][j][k][0][SINGLE_SCAN]; // level
              run   = currSE->value2 = img->cof[i][j][k][1][SINGLE_SCAN]; // run

              if (input->symbol_mode == UVLC)
                currSE->mapping = levrun_linfo_inter;
              else
              {
                currSE->context = 4; // for choosing context model
                currSE->writing = writeRunLevel2Buffer_CABAC;
              }
              currSE->type  = SE_LUM_AC_INTRA;   // element is of type AC

              // choose the appropriate data partition
              if (img->type != B_IMG)
                dataPart = &(currSlice->partArr[partMap[currSE->type]]);
              else
                dataPart = &(currSlice->partArr[partMap[SE_BFRAME]]);

              dataPart->writeSyntaxElement (currSE, dataPart);
              bitCount[BITS_COEFF_Y_MB]+=currSE->len;
              no_bits                  +=currSE->len;
#if TRACE
              snprintf(currSE->tracestring, TRACESTRING_SIZE, "AC luma 16x16 sng(%2d) level =%3d run =%2d", k, level, run);
#endif
              // proceed to next SE
              currSE++;
              currMB->currSEnr++;
            }
          }
        }
      }
    }
  }

  return no_bits;
}





int
writeMB_bits_for_DC_chroma (int filtering)
{
  int           no_bits    = 0;
  Macroblock    *currMB    = &img->mb_data[img->current_mb_nr];
  SyntaxElement *currSE    = &img->MB_SyntaxElements[currMB->currSEnr];
  int           *bitCount  = currMB->bitcounter;
  Slice         *currSlice = img->currentSlice;
  DataPartition *dataPart;
  int           *partMap   = assignSE2partition[input->partition_mode];

  int cbp = img->mb_data [img->current_mb_nr].cbp;

  int level, run;
  int k, uv;


  if (cbp > 15)  // check if any chroma bits in coded block pattern is set
  {
    for (uv=0; uv < 2; uv++)
    {
      level=1;
      for (k=0; k < 5 && level != 0; ++k)
      {
        level = currSE->value1 = img->cofu[k][0][uv]; // level
        run   = currSE->value2 = img->cofu[k][1][uv]; // run

        if (input->symbol_mode == UVLC)
          currSE->mapping = levrun_linfo_c2x2;
        else
          currSE->writing = writeRunLevel2Buffer_CABAC;

        if (img->imod == INTRA_MB_OLD || img->imod == INTRA_MB_NEW)
        {
          currSE->context = 6; // for choosing context model
          currSE->type  = SE_CHR_DC_INTRA;
        }
        else
        {
          currSE->context = 5; // for choosing context model
          currSE->type  = SE_CHR_DC_INTER;
        }

        // choose the appropriate data partition
        if (img->type != B_IMG)
          dataPart = &(currSlice->partArr[partMap[currSE->type]]);
        else
          dataPart = &(currSlice->partArr[partMap[SE_BFRAME]]);

        dataPart->writeSyntaxElement (currSE, dataPart);
        bitCount[BITS_COEFF_UV_MB]+=currSE->len;
        no_bits                   +=currSE->len;
#if TRACE
        snprintf(currSE->tracestring, TRACESTRING_SIZE, "2x2 DC Chroma %2d: level =%3d run =%2d",k, level, run);
#endif

        // proceed to next SE
        currSE++;
        currMB->currSEnr++;
      }
    }
  }

  return no_bits;
}

int
writeMB_bits_for_AC_chroma (int  filtering)
{
  int           no_bits    = 0;
  Macroblock    *currMB    = &img->mb_data[img->current_mb_nr];
  SyntaxElement *currSE    = &img->MB_SyntaxElements[currMB->currSEnr];
  int           *bitCount  = currMB->bitcounter;
  Slice         *currSlice = img->currentSlice;
  DataPartition *dataPart;
  int           *partMap   = assignSE2partition[input->partition_mode];

  int cbp = img->mb_data [img->current_mb_nr].cbp;

  int level, run;
  int i, j, k, mb_x, mb_y, i1, ii, j1, jj;


  if (cbp >> 4 == 2) // check if chroma bits in coded block pattern = 10b
  {
    for (mb_y=4; mb_y < 6; mb_y += 2)
    {
      for (mb_x=0; mb_x < 4; mb_x += 2)
      {
        for (j=mb_y; j < mb_y+2; j++)
        {
          jj=j/2;
          j1=j-4;
          for (i=mb_x; i < mb_x+2; i++)
          {
            ii=i/2;
            i1=i%2;
            level=1;
            for (k=0; k < 16 && level != 0; k++)
            {
              level = currSE->value1 = img->cof[i][j][k][0][0]; // level
              run   = currSE->value2 = img->cof[i][j][k][1][0]; // run

              if (input->symbol_mode == UVLC)
                currSE->mapping = levrun_linfo_inter;
              else
                currSE->writing = writeRunLevel2Buffer_CABAC;

              if (img->imod == INTRA_MB_OLD || img->imod == INTRA_MB_NEW)
              {
                currSE->context = 8; // for choosing context model
                currSE->type  = SE_CHR_AC_INTRA;
              }
              else
              {
                currSE->context = 7; // for choosing context model
                currSE->type  = SE_CHR_AC_INTER;
              }
              // choose the appropriate data partition
              if (img->type != B_IMG)
                dataPart = &(currSlice->partArr[partMap[currSE->type]]);
              else
                dataPart = &(currSlice->partArr[partMap[SE_BFRAME]]);

              dataPart->writeSyntaxElement (currSE, dataPart);
              bitCount[BITS_COEFF_UV_MB]+=currSE->len;
              no_bits                   +=currSE->len;
#if TRACE
              snprintf(currSE->tracestring, TRACESTRING_SIZE, "AC Chroma %2d: level =%3d run =%2d",k, level, run);
#endif
              // proceed to next SE
              currSE++;
              currMB->currSEnr++;
            }
          }
        }
      }
    }
  }

  return no_bits;
}

/*!
 ************************************************************************
 * \brief
 *    Find best 16x16 based intra mode
 *
 * \par Input:
 *    Image parameters, pointer to best 16x16 intra mode
 *
 * \par Output:
 *    best 16x16 based SAD
 ************************************************************************/
int find_sad2(int *intra_mode)
{
  int current_intra_sad_2,best_intra_sad2;
  int M1[16][16],M0[4][4][4][4],M3[4],M4[4][4];

  int i,j,k;
  int ii,jj;

  best_intra_sad2=MAX_VALUE;

  for (k=0;k<4;k++)
  {
    int mb_nr = img->current_mb_nr;
    int mb_width = img->width/16;
    int mb_available_up = (img->mb_y == 0) ? 0 : (img->slice_numbers[mb_nr] == img->slice_numbers[mb_nr-mb_width]);
    int mb_available_left = (img->mb_x == 0) ? 0 : (img->slice_numbers[mb_nr] == img->slice_numbers[mb_nr-1]);
    if(input->UseConstrainedIntraPred)
    {
      if (mb_available_up && (img->intra_mb[mb_nr-mb_width] ==0))
        mb_available_up = 0;
      if (mb_available_left && (img->intra_mb[mb_nr-1] ==0))
        mb_available_left = 0;
    }
    //check if there are neighbours to predict from
    if ((k==0 && !mb_available_up) || (k==1 && !mb_available_left) || (k==3 && (!mb_available_left || !mb_available_up)))
    {
      ; // edge, do nothing
    }
    else
    {
      for (j=0;j<16;j++)
      {
        for (i=0;i<16;i++)
        {
          M1[i][j]=imgY_org[img->pix_y+j][img->pix_x+i]-img->mprr_2[k][j][i];
          M0[i%4][i/4][j%4][j/4]=M1[i][j];
        }
      }
      current_intra_sad_2=0;              // no SAD start handicap here
      for (jj=0;jj<4;jj++)
      {
        for (ii=0;ii<4;ii++)
        {
          for (j=0;j<4;j++)
          {
            M3[0]=M0[0][ii][j][jj]+M0[3][ii][j][jj];
            M3[1]=M0[1][ii][j][jj]+M0[2][ii][j][jj];
            M3[2]=M0[1][ii][j][jj]-M0[2][ii][j][jj];
            M3[3]=M0[0][ii][j][jj]-M0[3][ii][j][jj];

            M0[0][ii][j][jj]=M3[0]+M3[1];
            M0[2][ii][j][jj]=M3[0]-M3[1];
            M0[1][ii][j][jj]=M3[2]+M3[3];
            M0[3][ii][j][jj]=M3[3]-M3[2];
          }

          for (i=0;i<4;i++)
          {
            M3[0]=M0[i][ii][0][jj]+M0[i][ii][3][jj];
            M3[1]=M0[i][ii][1][jj]+M0[i][ii][2][jj];
            M3[2]=M0[i][ii][1][jj]-M0[i][ii][2][jj];
            M3[3]=M0[i][ii][0][jj]-M0[i][ii][3][jj];

            M0[i][ii][0][jj]=M3[0]+M3[1];
            M0[i][ii][2][jj]=M3[0]-M3[1];
            M0[i][ii][1][jj]=M3[2]+M3[3];
            M0[i][ii][3][jj]=M3[3]-M3[2];
            for (j=0;j<4;j++)
              if ((i+j)!=0)
                current_intra_sad_2 += abs(M0[i][ii][j][jj]);
          }
        }