wp_lms.c

H.264编码实现

************************************************************************
*/

int TestWPPSliceAlg1(ImageParameters *img, InputParameters *params, int select_offset)
{
  int i, j, k, n;

  int index;
  int comp;
  double dc_org = 0.0;
  double dc_org_UV[2] = {0.0};  
  double dc_ref[MAX_REFERENCE_PICTURES] = { 0.0 };
  double dc_ref_UV[MAX_REFERENCE_PICTURES][2] = { {0.0}};
  double norm_org = 0.0;
  double norm_ref[MAX_REFERENCE_PICTURES] = { 0.0 };
  double numer = {0.0};
  double denom[MAX_REFERENCE_PICTURES] = {0.0};

  int default_weight[3];

  int list_offset   = ((img->MbaffFrameFlag)&&(img->mb_data[img->current_mb_nr].mb_field))? (img->current_mb_nr & 0x01) ? 4 : 2 : 0;
  int weight[2][MAX_REFERENCE_PICTURES][3];
  int offset[2][MAX_REFERENCE_PICTURES][3];
  int clist;
  int perform_wp = 0;
  imgpel **tmpPtr;

  luma_log_weight_denom =   5;
  chroma_log_weight_denom = 5;
  wp_luma_round     = 1 << (luma_log_weight_denom - 1);
  wp_chroma_round   = 1 << (chroma_log_weight_denom - 1);
  default_weight[0] = 1 << luma_log_weight_denom;
  default_weight[1] = default_weight[2] = 1 << chroma_log_weight_denom;

  /* set all values to defaults */
  for (i = 0; i < 2 + list_offset; i++)
  {
    for (j = 0; j < listXsize[i]; j++)
    {
      for (n = 0; n < 3; n++)
      {
        weight[i][j][n] = default_weight[n];
        wp_weight[i][j][n] = default_weight[n];
        wp_offset[i][j][n] = 0;
        offset[i][j][n] = 0;
      }
    }
  }

  dc_org = ComputeImgSum(pCurImg, img->height, img->width);

  norm_org = dc_org / ((double) img->size);
  numer = ComputeNormMean(pCurImg, norm_org, img->height, img->width);

  if (params->ChromaWeightSupport == 1)
  {
    for (k = 0; k < 2; k++)
    {
      dc_org_UV[k] = ComputeImgSum(pImgOrg[k + 1], img->height_cr, img->width_cr);
    } 
  }

  for (clist = 0; clist < 2 + list_offset; clist++)
  {
    for (n = 0; n < listXsize[clist]; n++)
    {
      tmpPtr = listX[clist][n]->p_curr_img;
      dc_ref[n] = ComputeImgSum(tmpPtr, img->height, img->width);

      norm_ref[n] = dc_ref[n] / ((double) img->size);
      denom[n] = ComputeNormMean(tmpPtr, norm_ref[n], img->height, img->width);

      if (params->ChromaWeightSupport == 1)
      {
        for (k = 0; k < 2; k++)
        {
          tmpPtr = listX[clist][n]->imgUV[k];
          dc_ref_UV[n][k] = ComputeImgSum(tmpPtr, img->height_cr, img->width_cr);
        }        
      }

      if (select_offset == 0)
      {
        if (denom[n] != 0)
          weight[clist][n][0] = (int) (default_weight[0] * numer / denom[n] + 0.5);
        else
          weight[clist][n][0] = default_weight[0];  // only used when reference picture is black
        weight[clist][n][0] = iClip3(-128, 127, weight[clist][n][0]);

        offset[clist][n][0] = (int) (norm_org - ((double) weight[clist][n][0] * norm_ref[n] / (double) default_weight[0]) + 0.5);
        offset[clist][n][0] = (offset[clist][n][0]+((img->bitdepth_luma-8)>>1))>>(img->bitdepth_luma-8);
        offset[clist][n][0] = iClip3( -128, 127, offset[clist][n][0]);
        offset[clist][n][0] = offset[clist][n][0]<<(img->bitdepth_luma-8);       

        if (params->ChromaWeightSupport == 1)
        {
          if (dc_ref_UV[n][0] != 0)
            weight[clist][n][1] = (int) (default_weight[1] * dc_org_UV[0] / dc_ref_UV[n][0] + 0.5);
          else
            weight[clist][n][1] = default_weight[1];  // only used when reference picture is black
          weight[clist][n][1] = iClip3(-128, 127, weight[clist][n][1]);

          if (dc_ref_UV[n][1] != 0)
            weight[clist][n][2] = (int) (default_weight[2] * dc_org_UV[1] / dc_ref_UV[n][1] + 0.5);
          else
            weight[clist][n][2] = default_weight[2];  // only used when reference picture is black
          weight[clist][n][2] = iClip3(-64, 128, weight[clist][n][2]);
        }
      }
      else
      {
        offset[clist][n][0] = (int) ((dc_org - dc_ref[n])/(img->size)+0.5);
        offset[clist][n][0] = (offset[clist][n][0]+((img->bitdepth_luma-8)>>1))>>(img->bitdepth_luma-8);
        offset[clist][n][0] = iClip3( -128, 127, offset[clist][n][0]);
        offset[clist][n][0] = offset[clist][n][0]<<(img->bitdepth_luma-8);
        weight[clist][n][0] = default_weight[0];

        if (params->ChromaWeightSupport == 1)
        {
            offset[clist][n][1] = (int) ((dc_org_UV[0] - dc_ref_UV[n][0])/(img->size_cr)+0.5);
            offset[clist][n][1] = (offset[clist][n][1] + ((img->bitdepth_chroma - 8)>>1))>>(img->bitdepth_chroma-8);
            offset[clist][n][1] = iClip3( -128, 127, offset[clist][n][1]);
            offset[clist][n][1] = offset[clist][n][1]<<(img->bitdepth_chroma - 8);
            
            weight[clist][n][1] = default_weight[1];

            offset[clist][n][2] = (int) ((dc_org_UV[1] - dc_ref_UV[n][1])/(img->size_cr)+0.5);
            offset[clist][n][2] = (offset[clist][n][2] + ((img->bitdepth_chroma - 8)>>1))>>(img->bitdepth_chroma-8);
            offset[clist][n][2] = iClip3( -128, 127, offset[clist][n][2]);
            offset[clist][n][2] = offset[clist][n][2]<<(img->bitdepth_chroma - 8);

            weight[clist][n][2] = default_weight[2];
        }
      }
    }
  }

  for (clist=0; clist<2 + list_offset; clist++)
  {
    for (index = 0; index < listXsize[clist]; index++)
    {
      for (comp=0; comp < 3; comp ++)
      {
        int offset_test = params->RDPSliceBTest && active_sps->profile_idc != 66
          ? iabs(offset[clist][index][comp]) > 2
          : offset[clist][index][comp] != 0;

        if (weight[clist][index][comp] != default_weight[0] || offset_test)
        {
          perform_wp = 1;
          break;
        }
      }
      if (perform_wp == 1) break;
    }
    if (perform_wp == 1) break;
  }

  return perform_wp;
}

/*!
************************************************************************
* \brief
*    TestWPBSliceAlg1:
*    Tests B slice weighting prediction
************************************************************************
*/
int TestWPBSliceAlg1(ImageParameters *img, InputParameters *params, int select_method)
{
  int i, j, k, n;

  int tx,DistScaleFactor;

  int index;
  int comp;
  double dc_org = 0.0;
  double dc_org_UV[2] = { 0.0 };    
  double dc_ref[6][MAX_REFERENCE_PICTURES] = { {0.0} };  
  double dc_ref_UV[6][MAX_REFERENCE_PICTURES][2] = { {{0.0}} };
  double norm_org = 0.0;
  double norm_ref[MAX_REFERENCE_PICTURES] = { 0.0 };
  double numer = {0.0};
  double denom[MAX_REFERENCE_PICTURES] = {0.0};

  int default_weight[3];
  // this needs to be fixed.
  int list_offset   = ((img->MbaffFrameFlag)&&(img->mb_data[img->current_mb_nr].mb_field))? (img->current_mb_nr & 0x01) ? 4 : 2 : 0;
  int weight[6][MAX_REFERENCE_PICTURES][3];
  int offset[6][MAX_REFERENCE_PICTURES][3];
  int im_weight[6][MAX_REFERENCE_PICTURES][MAX_REFERENCE_PICTURES][3];
  int clist;
  int wf_weight, wf_offset;
  int perform_wp = 0;
  imgpel **tmpPtr;

  if (select_method == 1) //! implicit mode
  {
    luma_log_weight_denom = 5;
    chroma_log_weight_denom = 5;
  }
  else
  {
    luma_log_weight_denom = 5;
    chroma_log_weight_denom = 5;
  }

  wp_luma_round     = 1 << (luma_log_weight_denom - 1);
  wp_chroma_round   = 1 << (chroma_log_weight_denom - 1);
  default_weight[0] = 1 << luma_log_weight_denom;
  default_weight[1] = 1 << chroma_log_weight_denom;
  default_weight[2] = 1 << chroma_log_weight_denom;

  /* set all values to defaults */
  for (i = 0; i < 2 + list_offset; i++)
  {
    for (j = 0; j < listXsize[i]; j++)
    {
      for (n = 0; n < 3; n++)
      {
        wp_weight[i][j][n] = default_weight[n];
        wp_offset[i][j][n] = 0;
        offset   [i][j][n] = 0;
        weight   [i][j][n] = default_weight[n];
      }
    }
  }

  for (i = 0; i < listXsize[LIST_0]; i++)
  {
    for (j = 0; j < listXsize[LIST_1]; j++)
    {
      int td, tb;
      td = iClip3(-128, 127,(listX[LIST_1][j]->poc - listX[LIST_0][i]->poc));
      tb = iClip3(-128, 127,(enc_picture->poc - listX[LIST_0][i]->poc));
      for (comp = 0; comp < 3; comp++)
      {
        // implicit weights
        if (td == 0)
        {
          im_weight[0][i][j][comp] = default_weight[comp];
          im_weight[1][i][j][comp] = default_weight[comp];
        }
        else
        {
          tx = (16384 + iabs(td/2))/td;
          DistScaleFactor = iClip3(-1024, 1023, (tx*tb + 32 )>>6);
          im_weight[1][i][j][comp] = DistScaleFactor >> 2;
          if (im_weight[1][i][j][comp] < -64 || im_weight[1][i][j][comp] >128)
            im_weight[1][i][j][comp] = default_weight[comp];
          im_weight[0][i][j][comp] = 64 - im_weight[1][i][j][comp];
        }
      }
    }
  }


  if (select_method == 1) //! implicit mode
  {
    for (i = 0; i < listXsize[LIST_0]; i++)
    {
      for (j = 0; j < listXsize[LIST_1]; j++)
      {
        for (comp = 0; comp < 3; comp++)
        {
          wbp_weight[1][i][j][comp] = im_weight[1][i][j][comp] ;
          wbp_weight[0][i][j][comp] = im_weight[0][i][j][comp];
        }
      }
    }

    for (clist=0; clist<2 + list_offset; clist++)
    {
      for (index = 0; index < listXsize[clist]; index++)
      {
        for (comp = 0; comp < 3; comp++)
        {
          wp_weight[clist][index][comp] = default_weight[comp];
          wp_offset[clist][index][comp] = 0;
        }
      }
    }
  }
  else
  {
    dc_org = ComputeImgSum(pCurImg, img->height, img->width);

    if (params->EnhancedBWeightSupport)
    {
      norm_org = dc_org / ((double) img->size);
      numer = ComputeNormMean(pCurImg, norm_org, img->height, img->width);
    }

    if (params->ChromaWeightSupport == 1)
    {
      for (k = 0; k < 2; k++)
      {
        dc_org_UV[k] = ComputeImgSum(pImgOrg[k + 1], img->height_cr, img->width_cr);
      } 
    }

    for (clist=0; clist<2 + list_offset; clist++)
    {
      for (n = 0; n < listXsize[clist]; n++)
      {
        // To simplify these computations we may wish to perform these after a reference is 
        // stored in the reference buffer and attach them to the storedimage structure!!!
        // Y
        tmpPtr = listX[clist][n]->p_curr_img;
        dc_ref[clist][n] = ComputeImgSum(tmpPtr, img->height, img->width);

        if (params->EnhancedBWeightSupport)
        {
          norm_ref[n] = dc_ref[clist][n] / ((double) img->size);
          denom[n] = ComputeNormMean(tmpPtr, norm_ref[n], img->height, img->width);

          if (denom[n] != 0)
            wf_weight = (int) (default_weight[0] * numer / denom[n] + 0.5);
          else
            wf_weight = default_weight[0];  // only used when reference picture is black
          wf_weight = iClip3(-128, 127, wf_weight);

          wf_offset = (int) (norm_org - ((double) wf_weight * norm_ref[n] / (double) default_weight[0]) + 0.5);
          wf_offset = (wf_offset  + ((img->bitdepth_luma-8)>>1))>>(img->bitdepth_luma-8);
          wf_offset = iClip3( -128, 127, wf_offset);
          wf_offset = wf_offset <<(img->bitdepth_luma - 8);
        }
        else
        {
          if (dc_ref[clist][n] != 0.0)
            wf_weight = (int) (default_weight[0] * dc_org / dc_ref[clist][n] + 0.5);
          else
            wf_weight = default_weight[0];  // only used when reference picture is black
          wf_weight = iClip3(-128, 127, wf_weight);
          wf_offset = 0;
        }

        weight[clist][n][0] = wf_weight;
        offset[clist][n][0] = wf_offset;

        // UV
        if (params->ChromaWeightSupport == 1)
        {          
          for (k = 0; k < 2; k++)
          {
            tmpPtr = listX[clist][n]->imgUV[k];
            dc_ref_UV[clist][n][k] = ComputeImgSum(tmpPtr, img->height_cr, img->width_cr);

            if (dc_ref_UV[clist][n][k] != 0.0)
              wf_weight = (int) (default_weight[k + 1] * dc_org_UV[k] / dc_ref_UV[clist][n][k] + 0.5);
            else
              wf_weight = default_weight[k + 1];  // only used when reference picture is black
            wf_weight = iClip3(-128, 127, wf_weight);
            wf_offset = 0;

            weight[clist][n][k + 1] = wf_weight;
            offset[clist][n][k + 1] = wf_offset;
          }
        }
        else
        {
          weight[clist][n][1] = default_weight[1];
          weight[clist][n][2] = default_weight[2];        
          offset[clist][n][1] = 0;
          offset[clist][n][2] = 0;
        }
      }
    }

    if (select_method == 0) //! explicit mode
    {
      for (clist=0; clist<2 + list_offset; clist++)
      {
        for (index = 0; index < listXsize[clist]; index++)
        {
          memcpy(wp_weight[clist][index], weight[clist][index], 3 * sizeof(int));
          memcpy(wp_offset[clist][index], offset[clist][index], 3 * sizeof(int));
        }
      }
    }
    else
    {
      for (clist=0; clist<2 + list_offset; clist++)
      {
        for (index = 0; index < listXsize[clist]; index++)
        {
          memcpy(wp_weight[clist][index], default_weight, 3 * sizeof(int));
          memset(wp_offset[clist][index], 0, 3 * sizeof(int));
        }
      }
    }

    for (i = 0; i < listXsize[LIST_0]; i++)
    {
      for (j = 0; j < listXsize[LIST_1]; j++)
      {
        for (comp = 0; comp < 3; comp++)
        {
          wbp_weight[0][i][j][comp] = wp_weight[0][i][comp];
          wbp_weight[1][i][j][comp] = wp_weight[1][j][comp];
        }
#if DEBUG_WP
        printf ("bpw weight[%d][%d] = %d  , %d (%d %d %d) (%d %d) (%d %d)\n", i, j, wbp_weight[0][i][j][0], wbp_weight[1][i][j][0],
        enc_picture->poc,listX[LIST_0][i]->poc, listX[LIST_1][j]->poc,
        DistScaleFactor ,tx,tx,tx);
#endif
      }
    }
  }

  if (select_method == 0) //! implicit mode
  {
    int active_refs[2];

    active_refs[0] = (params->B_List0_refs == 0 ? listXsize[0] : imin(params->B_List0_refs, listXsize[0]));
    active_refs[1] = (params->B_List1_refs == 0 ? listXsize[1] : imin(params->B_List1_refs, listXsize[1]));

    for (clist=0; clist<2 + list_offset; clist++)
    {
      for (index = 0; index < active_refs[clist]; index++)
      {
        for (comp=0; comp < 3; comp ++)
        {
          if (wp_weight[clist][index][comp] != default_weight[comp])
          {
            perform_wp = 1;
            break;
          }
        }
        if (perform_wp == 1) break;
      }
      if (perform_wp == 1) break;
    }
  }
  return perform_wp;
}