me_fullfast.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

  int abs_y4, abs_x4;

  int   i, j, k;
  int   level_dist = F_PEL + apply_weights * 3;
  int   pixel_x, pixel_y;


  for ( j= img->opix_y; j < img->opix_y + MB_BLOCK_SIZE; j +=BLOCK_SIZE)
  {
    for (pixel_y = j; pixel_y < j + BLOCK_SIZE; pixel_y++)
    {
      memcpy( srcptr, &imgY_org[pixel_y][img->opix_x], BLOCK_SIZE * sizeof(imgpel));
      memcpy( srcptr + 16, &imgY_org[pixel_y][img->opix_x + BLOCK_SIZE], BLOCK_SIZE * sizeof(imgpel));
      memcpy( srcptr + 32, &imgY_org[pixel_y][img->opix_x + 2 * BLOCK_SIZE], BLOCK_SIZE * sizeof(imgpel));
      memcpy( srcptr + 48, &imgY_org[pixel_y][img->opix_x + 3 * BLOCK_SIZE], BLOCK_SIZE * sizeof(imgpel));
      srcptr += BLOCK_SIZE;
    }
    srcptr += 48;
  }
  // storage format is different from that of orig_pic
  // for YUV 4:2:0 we have:
  // YYYY
  // YYYY
  // U U
  //
  // V V
  //
  if (ChromaMEEnable)
  {
    imgpel *auxptr;
    int   bsx_c = BLOCK_SIZE >> (chroma_shift_x - 2);
    int   bsy_c = BLOCK_SIZE >> (chroma_shift_y - 2);
    int   pic_pix_x_c = img->opix_x >> (chroma_shift_x - 2);
    int   pic_pix_y_c = img->opix_y >> (chroma_shift_y - 2);

    // copy the original cmp1 and cmp2 data to the orig_pic matrix
    // This seems to be wrong.
    for (k=0; k<2; k++)
    {
      srcptr = auxptr = orig_pels + (256 << k);
      for ( pixel_y = 0, i = 0; i < (BLOCK_SIZE >> (chroma_shift_y - 2)); i++, pixel_y += bsy_c )
      {
        for ( pixel_x = 0, k = 0; k < (BLOCK_SIZE >> (chroma_shift_x - 2)); k++, pixel_x += bsx_c )
        {
          srcptr = auxptr;
          for (j = 0; j < bsy_c; j++)
          {
            memcpy( srcptr, &imgUV_org[k][pic_pix_y_c + pixel_y + j][pic_pix_x_c + pixel_x], bsx_c * sizeof(imgpel));
            srcptr += bsx_c;
          }
          auxptr += MB_BLOCK_SIZE;
        }
      }
    }
  }


  ref_picture     = listX[list+list_offset][ref];
  ref_access_method = FAST_ACCESS;

  //===== Use weighted Reference for ME ====
  ref_pic_sub.luma = ref_picture->curr_imgY_sub;

  if (apply_weights)
  {
    weight_luma = wp_weight[list + list_offset][ref][0];
    offset_luma = wp_offset[list + list_offset][ref][0];
  }

  if ( ChromaMEEnable)
  {
    ref_pic_sub.crcb[0] = ref_picture->imgUV_sub[0];
    ref_pic_sub.crcb[1] = ref_picture->imgUV_sub[1];
    width_pad_cr  = ref_picture->size_x_cr_pad;
    height_pad_cr = ref_picture->size_y_cr_pad;
    if (apply_weights)
    {
      weight_cr[0] = wp_weight[list + list_offset][ref][1];
      weight_cr[1] = wp_weight[list + list_offset][ref][2];
      offset_cr[0] = wp_offset[list + list_offset][ref][1];
      offset_cr[1] = wp_offset[list + list_offset][ref][2];
    }
  }

  max_width     = ref_picture->size_x - 17;
  max_height    = ref_picture->size_y - 17;

  img_width     = ref_picture->size_x;
  img_height    = ref_picture->size_y;
  width_pad     = ref_picture->size_x_pad;
  height_pad    = ref_picture->size_y_pad;

  //===== get search center: predictor of 16x16 block =====
  SetMotionVectorPredictor (pmv, enc_picture->ref_idx[list], enc_picture->mv[list], ref, list, 0, 0, 16, 16);

  search_center_x[list][ref] = pmv[0] / 4;
  search_center_y[list][ref] = pmv[1] / 4;

  if (!input->rdopt)
  {
    //--- correct center so that (0,0) vector is inside ---
    search_center_x[list][ref] = iClip3(-search_range, search_range, search_center_x[list][ref]);
    search_center_y[list][ref] = iClip3(-search_range, search_range, search_center_y[list][ref]);
  }
  search_center_x[list][ref] = iClip3(-2047 + search_range, 2047 - search_range, search_center_x[list][ref]);
  search_center_y[list][ref] = iClip3(LEVELMVLIMIT[img->LevelIndex][0] + search_range, LEVELMVLIMIT[img->LevelIndex][1]  - search_range, search_center_y[list][ref]);

  search_center_x[list][ref] += img->opix_x;
  search_center_y[list][ref] += img->opix_y;

  offset_x = search_center_x[list][ref];
  offset_y = search_center_y[list][ref];


  //===== check if whole search range is inside image =====
  if (offset_x >= search_range && offset_x <= max_width  - search_range &&
    offset_y >= search_range && offset_y <= max_height - search_range   )
  {
    range_partly_outside = 0;
  }
  else
  {
    range_partly_outside = 1;
  }

  //===== determine position of (0,0)-vector =====
  if (!input->rdopt)
  {
    ref_x = img->opix_x - offset_x;
    ref_y = img->opix_y - offset_y;

    for (pos = 0; pos < max_pos; pos++)
    {
      if (ref_x == spiral_search_x[pos] &&
        ref_y == spiral_search_y[pos])
      {
        pos_00[list][ref] = pos;
        break;
      }
    }
  }

  //===== loop over search range (spiral search): get blockwise SAD =====
  for (pos = 0; pos < max_pos; pos++)
  {
    abs_y = offset_y + spiral_search_y[pos];
    abs_x = offset_x + spiral_search_x[pos];

    abs_y4 = (abs_y + IMG_PAD_SIZE) << 2;
    abs_x4 = (abs_x + IMG_PAD_SIZE) << 2;

    if (range_partly_outside)
    {
      if (abs_y >= 0 && abs_y <= max_height &&
        abs_x >= 0 && abs_x <= max_width    )
      {
        ref_access_method = FAST_ACCESS;
      }
      else
      {
        ref_access_method = UMV_ACCESS;
      }
    }

    srcptr = orig_pels;
    bindex = 0;
    for (blky = 0; blky < 4; blky++)
    {
      block_sad[bindex++][pos] = computeUniPred[level_dist](srcptr, 4, 4, INT_MAX, abs_x4,      abs_y4);
      srcptr += 16;
      block_sad[bindex++][pos] = computeUniPred[level_dist](srcptr, 4, 4, INT_MAX, abs_x4 + 16, abs_y4);
      srcptr += 16;
      block_sad[bindex++][pos] = computeUniPred[level_dist](srcptr, 4, 4, INT_MAX, abs_x4 + 32, abs_y4);
      srcptr += 16;
      block_sad[bindex++][pos] = computeUniPred[level_dist](srcptr, 4, 4, INT_MAX, abs_x4 + 48, abs_y4);
      srcptr += 16;
      abs_y4 += 16;
    }
  }

  //===== combine SAD's for larger block types =====
  SetupLargerBlocks (list, ref, max_pos);

  //===== set flag marking that search setup have been done =====
  search_setup_done[list][ref] = 1;
}

#else
void SetupFastFullPelSearch (short ref, int list)  // <--  reference frame parameter, list0 or 1
{
  short   pmv[2];
  static imgpel orig_pels[768];
  imgpel  *srcptr = orig_pels, *refptr;
  int     k, x, y;
  int     abs_y4, abs_x4;
  int     offset_x, offset_y, range_partly_outside, ref_x, ref_y, pos, abs_x, abs_y, bindex, blky;
  int     LineSadBlk0, LineSadBlk1, LineSadBlk2, LineSadBlk3;
  int     max_width, max_height;
  int     img_width, img_height;

  StorablePicture *ref_picture;
  distpel**   block_sad = BlockSAD[list][ref][7];
  int     search_range  = max_search_range[list][ref];
  int     max_pos       = (2*search_range+1) * (2*search_range+1);

  int     list_offset   = img->mb_data[img->current_mb_nr].list_offset;
  int     apply_weights = ( (active_pps->weighted_pred_flag && (img->type == P_SLICE || img->type == SP_SLICE)) ||
    (active_pps->weighted_bipred_idc && (img->type == B_SLICE))) && input->UseWeightedReferenceME;
  int     weighted_pel;
  int *dist_method = input->MEErrorMetric[0] ? img->quad : byte_abs;

  ref_picture     = listX[list+list_offset][ref];
  ref_access_method = FAST_ACCESS;

  ref_pic_sub.luma = ref_picture->curr_imgY_sub;

  max_width     = ref_picture->size_x - 17;
  max_height    = ref_picture->size_y - 17;

  img_width     = ref_picture->size_x;
  img_height    = ref_picture->size_y;
  width_pad     = ref_picture->size_x_pad;
  height_pad    = ref_picture->size_y_pad;

  if (apply_weights)
  {
    weight_luma = wp_weight[list + list_offset][ref][0];
    offset_luma = wp_offset[list + list_offset][ref][0];
  }

  if ( ChromaMEEnable)
  {
    ref_pic_sub.crcb[0] = ref_picture->imgUV_sub[0];
    ref_pic_sub.crcb[1] = ref_picture->imgUV_sub[1];
    width_pad_cr  = ref_picture->size_x_cr_pad;
    height_pad_cr = ref_picture->size_y_cr_pad;

    if (apply_weights)
    {
      weight_cr[0] = wp_weight[list + list_offset][ref][1];
      weight_cr[1] = wp_weight[list + list_offset][ref][2];
      offset_cr[0] = wp_offset[list + list_offset][ref][1];
      offset_cr[1] = wp_offset[list + list_offset][ref][2];
    }
  }

  //===== get search center: predictor of 16x16 block =====
  SetMotionVectorPredictor (pmv, enc_picture->ref_idx[list], enc_picture->mv[list], ref, list, 0, 0, 16, 16);

  search_center_x[list][ref] = pmv[0] / 4;
  search_center_y[list][ref] = pmv[1] / 4;

  if (!input->rdopt)
  {
    //--- correct center so that (0,0) vector is inside ---
    search_center_x[list][ref] = iClip3(-search_range, search_range, search_center_x[list][ref]);
    search_center_y[list][ref] = iClip3(-search_range, search_range, search_center_y[list][ref]);
  }

  search_center_x[list][ref] = iClip3(-2047 + search_range, 2047 - search_range, search_center_x[list][ref]);
  search_center_y[list][ref] = iClip3(LEVELMVLIMIT[img->LevelIndex][0] + search_range, LEVELMVLIMIT[img->LevelIndex][1]  - search_range, search_center_y[list][ref]);

  search_center_x[list][ref] += img->opix_x;
  search_center_y[list][ref] += img->opix_y;

  offset_x = search_center_x[list][ref];
  offset_y = search_center_y[list][ref];


  //===== copy original block for fast access =====
  for   (y = img->opix_y; y < img->opix_y+MB_BLOCK_SIZE; y++)
  {
    memcpy(srcptr, &imgY_org[y][img->opix_x], MB_BLOCK_SIZE * sizeof(imgpel));
    srcptr += MB_BLOCK_SIZE;
  }
  if ( ChromaMEEnable)
  {
    for (k = 0; k < 2; k++)
    {
      for   (y = img->opix_c_y; y < img->opix_c_y + img->mb_cr_size_y; y++)
      {
        memcpy(srcptr, &imgUV_org[k][y][img->opix_c_x], img->mb_cr_size_x * sizeof(imgpel));
        srcptr += img->mb_cr_size_x;
      }
    }
  }

  //===== check if whole search range is inside image =====
  if (offset_x >= search_range && offset_x <= max_width  - search_range &&
    offset_y >= search_range && offset_y <= max_height - search_range   )
  {
    range_partly_outside = 0;
  }
  else
  {
    range_partly_outside = 1;
  }

  //===== determine position of (0,0)-vector =====
  if (!input->rdopt)
  {
    ref_x = img->opix_x - offset_x;