text: 
  /*!
   ***************************************************************************
   * \file transform8x8.c
   *
   * \brief
   *    8x8 transform functions
   *
   * \author
   *    Main contributors (see contributors.h for copyright, address and affiliation details) 
   *    - Yuri Vatis          <vatis@hhi.de>
   *    - Jan Muenster        <muenster@hhi.de>
   *
   * \date
   *    12. October 2003
   **************************************************************************
   */
  
  #include <stdlib.h>
  #include "transform8x8.h"
  
  
  
  #define Q_BITS_8        16
  #define DQ_BITS_8       6 
  #define DQ_ROUND_8      (1<<(DQ_BITS_8-1))
  
  
  
  
  static const int quant_coef8[6][8][8] = 
  {
    { 
      {13107, 12222,  16777,  12222,  13107,  12222,  16777,  12222},
      {12222, 11428,  15481,  11428,  12222,  11428,  15481,  11428},
      {16777, 15481,  20972,  15481,  16777,  15481,  20972,  15481},
      {12222, 11428,  15481,  11428,  12222,  11428,  15481,  11428},
      {13107, 12222,  16777,  12222,  13107,  12222,  16777,  12222},
      {12222, 11428,  15481,  11428,  12222,  11428,  15481,  11428},
      {16777, 15481,  20972,  15481,  16777,  15481,  20972,  15481},
      {12222, 11428,  15481,  11428,  12222,  11428,  15481,  11428}
    },
    {
      {11916, 11058,  14980,  11058,  11916,  11058,  14980,  11058},
      {11058, 10826,  14290,  10826,  11058,  10826,  14290,  10826},
      {14980, 14290,  19174,  14290,  14980,  14290,  19174,  14290},
      {11058, 10826,  14290,  10826,  11058,  10826,  14290,  10826},
      {11916, 11058,  14980,  11058,  11916,  11058,  14980,  11058},
      {11058, 10826,  14290,  10826,  11058,  10826,  14290,  10826},
      {14980, 14290,  19174,  14290,  14980,  14290,  19174,  14290},
      {11058, 10826,  14290,  10826,  11058,  10826,  14290,  10826}
    },
    {
      {10082, 9675, 12710,  9675, 10082,  9675, 12710,  9675},
      {9675,  8943, 11985,  8943, 9675, 8943, 11985,  8943},
      {12710, 11985,  15978,  11985,  12710,  11985,  15978,  11985},
      {9675,  8943, 11985,  8943, 9675, 8943, 11985,  8943},
      {10082, 9675, 12710,  9675, 10082,  9675, 12710,  9675},
      {9675,  8943, 11985,  8943, 9675, 8943, 11985,  8943},
      {12710, 11985,  15978,  11985,  12710,  11985,  15978,  11985},
      {9675,  8943, 11985,  8943, 9675, 8943, 11985,  8943}
    },
    {
      {9362,  8931, 11984,  8931, 9362, 8931, 11984,  8931},
      {8931,  8228, 11259,  8228, 8931, 8228, 11259,  8228},
      {11984, 11259,  14913,  11259,  11984,  11259,  14913,  11259},
      {8931,  8228, 11259,  8228, 8931, 8228, 11259,  8228},
      {9362,  8931, 11984,  8931, 9362, 8931, 11984,  8931},
      {8931,  8228, 11259,  8228, 8931, 8228, 11259,  8228},
      {11984, 11259,  14913,  11259,  11984,  11259,  14913,  11259},
      {8931,  8228, 11259,  8228, 8931, 8228, 11259,  8228}
    },
    {
      {8192,  7740, 10486,  7740, 8192, 7740, 10486,  7740},
      {7740,  7346, 9777, 7346, 7740, 7346, 9777, 7346},
      {10486, 9777, 13159,  9777, 10486,  9777, 13159,  9777},
      {7740,  7346, 9777, 7346, 7740, 7346, 9777, 7346},
      {8192,  7740, 10486,  7740, 8192, 7740, 10486,  7740},
      {7740,  7346, 9777, 7346, 7740, 7346, 9777, 7346},
      {10486, 9777, 13159,  9777, 10486,  9777, 13159,  9777},
      {7740,  7346, 9777, 7346, 7740, 7346, 9777, 7346}
    },
    {
      {7282,  6830, 9118, 6830, 7282, 6830, 9118, 6830},
      {6830,  6428, 8640, 6428, 6830, 6428, 8640, 6428},
      {9118,  8640, 11570,  8640, 9118, 8640, 11570,  8640},
      {6830,  6428, 8640, 6428, 6830, 6428, 8640, 6428},
      {7282,  6830, 9118, 6830, 7282, 6830, 9118, 6830},
      {6830,  6428, 8640, 6428, 6830, 6428, 8640, 6428},
      {9118,  8640, 11570,  8640, 9118, 8640, 11570,  8640},
      {6830,  6428, 8640, 6428, 6830, 6428, 8640, 6428}
    }
  };
  
  
  
  static const int dequant_coef8[6][8][8] = 
  {
    {
      {20,  19, 25, 19, 20, 19, 25, 19},
      {19,  18, 24, 18, 19, 18, 24, 18},
      {25,  24, 32, 24, 25, 24, 32, 24},
      {19,  18, 24, 18, 19, 18, 24, 18},
      {20,  19, 25, 19, 20, 19, 25, 19},
      {19,  18, 24, 18, 19, 18, 24, 18},
      {25,  24, 32, 24, 25, 24, 32, 24},
      {19,  18, 24, 18, 19, 18, 24, 18}
    },
    {
      {22,  21, 28, 21, 22, 21, 28, 21},
      {21,  19, 26, 19, 21, 19, 26, 19},
      {28,  26, 35, 26, 28, 26, 35, 26},
      {21,  19, 26, 19, 21, 19, 26, 19},
      {22,  21, 28, 21, 22, 21, 28, 21},
      {21,  19, 26, 19, 21, 19, 26, 19},
      {28,  26, 35, 26, 28, 26, 35, 26},
      {21,  19, 26, 19, 21, 19, 26, 19}
    },
    {
      {26,  24, 33, 24, 26, 24, 33, 24},
      {24,  23, 31, 23, 24, 23, 31, 23},
      {33,  31, 42, 31, 33, 31, 42, 31},
      {24,  23, 31, 23, 24, 23, 31, 23},
      {26,  24, 33, 24, 26, 24, 33, 24},
      {24,  23, 31, 23, 24, 23, 31, 23},
      {33,  31, 42, 31, 33, 31, 42, 31},
      {24,  23, 31, 23, 24, 23, 31, 23}
    },
    {
      {28,  26, 35, 26, 28, 26, 35, 26},
      {26,  25, 33, 25, 26, 25, 33, 25},
      {35,  33, 45, 33, 35, 33, 45, 33},
      {26,  25, 33, 25, 26, 25, 33, 25},
      {28,  26, 35, 26, 28, 26, 35, 26},
      {26,  25, 33, 25, 26, 25, 33, 25},
      {35,  33, 45, 33, 35, 33, 45, 33},
      {26,  25, 33, 25, 26, 25, 33, 25}
    },
    {
      {32,  30, 40, 30, 32, 30, 40, 30},
      {30,  28, 38, 28, 30, 28, 38, 28},
      {40,  38, 51, 38, 40, 38, 51, 38},
      {30,  28, 38, 28, 30, 28, 38, 28},
      {32,  30, 40, 30, 32, 30, 40, 30},
      {30,  28, 38, 28, 30, 28, 38, 28},
      {40,  38, 51, 38, 40, 38, 51, 38},
      {30,  28, 38, 28, 30, 28, 38, 28}
    },
    {
      {36,  34, 46, 34, 36, 34, 46, 34},
      {34,  32, 43, 32, 34, 32, 43, 32},
      {46,  43, 58, 43, 46, 43, 58, 43},
      {34,  32, 43, 32, 34, 32, 43, 32},
      {36,  34, 46, 34, 36, 34, 46, 34},
      {34,  32, 43, 32, 34, 32, 43, 32},
      {46,  43, 58, 43, 46, 43, 58, 43},
      {34,  32, 43, 32, 34, 32, 43, 32}
    }
  
  };
  
  
  
  #ifdef _NEW_8x8_ARRAYS_INCLUDED_
  //! single scan pattern
  const byte SNGL_SCAN8x8[64][2] = {
    {0,0}, {1,0}, {0,1}, {0,2}, {1,1}, {2,0}, {3,0}, {2,1}, {1,2}, {0,3}, {0,4}, {1,3}, {2,2}, {3,1}, {4,0}, {5,0},
    {4,1}, {3,2}, {2,3}, {1,4}, {0,5}, {0,6}, {1,5}, {2,4}, {3,3}, {4,2}, {5,1}, {6,0}, {7,0}, {6,1}, {5,2}, {4,3},
    {3,4}, {2,5}, {1,6}, {0,7}, {1,7}, {2,6}, {3,5}, {4,4}, {5,3}, {6,2}, {7,1}, {7,2}, {6,3}, {5,4}, {4,5}, {3,6},
    {2,7}, {3,7}, {4,6}, {5,5}, {6,4}, {7,3}, {7,4}, {6,5}, {5,6}, {4,7}, {5,7}, {6,6}, {7,5}, {7,6}, {6,7}, {7,7}
  };
  
  //! field scan pattern
  const byte FIELD_SCAN8x8[64][2] = {
   {0,0}, {0,1}, {0,2}, {1,0}, {1,1}, {0,3}, {0,4}, {1,2}, {2,0}, {2,1}, {1,3}, {0,5}, {0,6}, {1,4}, {2,2}, {3,0},
   {3,1}, {2,3}, {1,5}, {0,7}, {1,6}, {2,4}, {3,2}, {4,0}, {4,1}, {3,3}, {2,5}, {1,7}, {2,6}, {3,4}, {4,2}, {5,0},
   {5,1}, {4,3}, {3,5}, {2,7}, {3,6}, {4,4}, {5,2}, {6,0}, {6,1}, {5,3}, {4,5}, {3,7}, {4,6}, {5,4}, {6,2}, {7,0},
   {7,1}, {6,3}, {5,5}, {4,7}, {5,6}, {6,4}, {7,2}, {7,3}, {6,5}, {5,7}, {6,6}, {7,4}, {7,5}, {6,7}, {7,6}, {7,7}
  };
  
  
  //! array used to find expencive coefficients
  const byte COEFF_COST8x8[64] =
  {
    3,3,3,3,2,2,2,2,2,2,2,2,1,1,1,1,
    1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,
    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
  };
  
  #endif
  
  // Notation for comments regarding prediction and predictors.
  // The pels of the 4x4 block are labelled a..p. The predictor pels above
  // are labelled A..H, from the left I..P, and from above left X, as follows:
  //
  //  Z  A  B  C  D  E  F  G  H  I  J  K  L  M   N  O  P  
  //  Q  a1 b1 c1 d1 e1 f1 g1 h1
  //  R  a2 b2 c2 d2 e2 f2 g2 h2
  //  S  a3 b3 c3 d3 e3 f3 g3 h3
  //  T  a4 b4 c4 d4 e4 f4 g4 h4
  //  U  a5 b5 c5 d5 e5 f5 g5 h5
  //  V  a6 b6 c6 d6 e6 f6 g6 h6
  //  W  a7 b7 c7 d7 e7 f7 g7 h7
  //  X  a8 b8 c8 d8 e8 f8 g8 h8
  
  
  // Predictor array index definitions
  #define P_Z (PredPel[0])
  #define P_A (PredPel[1])
  #define P_B (PredPel[2])
  #define P_C (PredPel[3])
  #define P_D (PredPel[4])
  #define P_E (PredPel[5])
  #define P_F (PredPel[6])
  #define P_G (PredPel[7])
  #define P_H (PredPel[8])
  #define P_I (PredPel[9])
  #define P_J (PredPel[10])
  #define P_K (PredPel[11])
  #define P_L (PredPel[12])
  #define P_M (PredPel[13])
  #define P_N (PredPel[14])
  #define P_O (PredPel[15])
  #define P_P (PredPel[16])
  #define P_Q (PredPel[17])
  #define P_R (PredPel[18])
  #define P_S (PredPel[19])
  #define P_T (PredPel[20])
  #define P_U (PredPel[21])
  #define P_V (PredPel[22])
  #define P_W (PredPel[23])
  #define P_X (PredPel[24])
  
  /*!
   ************************************************************************
   * \brief
   *    Make intra 8x8 prediction according to all 9 prediction modes.
   *    The routine uses left and upper neighbouring points from
   *    previous coded blocks to do this (if available). Notice that
   *    inaccessible neighbouring points are signalled with a negative
   *    value in the predmode array .
   *
   *  \par Input:
   *     Starting point of current 8x8 block image posision
   *
   ************************************************************************
   */
  int intrapred8x8( struct img_par *img,  //!< image parameters
                    int b8)
  
  {
    int i,j;
    int s0;
    int PredPel[25];  // array of predictor pels
    imgpel **imgY = dec_picture->imgY;  // For MB level frame/field coding tools -- set default to imgY
  
    int mb_nr=img->current_mb_nr;
  
    PixelPos pix_a[8];
    PixelPos pix_b, pix_c, pix_d;
  
    int block_available_up;
    int block_available_left;
    int block_available_up_left;
    int block_available_up_right;
    int img_block_x = (img->mb_x)*4 + 2*(b8%2);
    int img_block_y = (img->mb_y)*4 + 2*(b8/2);
    int ioff = (b8%2)*8;
    int joff = (b8/2)*8;
  
    byte predmode = img->ipredmode[img_block_x][img_block_y];
  
    for (i=0;i<8;i++)
    {
      getNeighbour(mb_nr, ioff -1 , joff +i , 1, &pix_a[i]);
    }
  
    getNeighbour(mb_nr, ioff    , joff -1 , 1, &pix_b);
    getNeighbour(mb_nr, ioff +8 , joff -1 , 1, &pix_c);
    getNeighbour(mb_nr, ioff -1 , joff -1 , 1, &pix_d);
    
    pix_c.available = pix_c.available &&!(ioff == 8 && joff == 8);
  
    if (active_pps->constrained_intra_pred_flag)
    {
      for (i=0, block_available_left=1; i<8;i++)
        block_available_left  &= pix_a[i].available ? img->intra_block[pix_a[i].mb_addr]: 0;
      block_available_up       = pix_b.available ? img->intra_block [pix_b.mb_addr] : 0;
      block_available_up_right = pix_c.available ? img->intra_block [pix_c.mb_addr] : 0;
      block_available_up_left  = pix_d.available ? img->intra_block [pix_d.mb_addr] : 0;
    }
    else
    {
      block_available_left     = pix_a[0].available;
      block_available_up       = pix_b.available;
      block_available_up_right = pix_c.available;
      block_available_up_left  = pix_d.available;
    }
  
  //  *left_available = block_available_left;
  //  *up_available   = block_available_up;
  //  *all_available  = block_available_up && block_available_left && block_available_up_left;
  
    // form predictor pels
    // form predictor pels
    if (block_available_up)
    {
      P_A = imgY[pix_b.pos_y][pix_b.pos_x+0];
      P_B = imgY[pix_b.pos_y][pix_b.pos_x+1];
      P_C = imgY[pix_b.pos_y][pix_b.pos_x+2];
      P_D = imgY[pix_b.pos_y][pix_b.pos_x+3];
      P_E = imgY[pix_b.pos_y][pix_b.pos_x+4];
      P_F = imgY[pix_b.pos_y][pix_b.pos_x+5];
      P_G = imgY[pix_b.pos_y][pix_b.pos_x+6];
      P_H = imgY[pix_b.pos_y][pix_b.pos_x+7];
    }
    else
    {
      P_A = P_B = P_C = P_D = P_E = P_F = P_G = P_H = img->dc_pred_value;
    }
  
    if (block_available_up_right)
    {
      P_I = imgY[pix_c.pos_y][pix_c.pos_x+0];
      P_J = imgY[pix_c.pos_y][pix_c.pos_x+1];
      P_K = imgY[pix_c.pos_y][pix_c.pos_x+2];
      P_L = imgY[pix_c.pos_y][pix_c.pos_x+3];
      P_M = imgY[pix_c.pos_y][pix_c.pos_x+4];
      P_N = imgY[pix_c.pos_y][pix_c.pos_x+5];
      P_O = imgY[pix_c.pos_y][pix_c.pos_x+6];
      P_P = imgY[pix_c.pos_y][pix_c.pos_x+7];
  
    }
    else
    {
      P_I = P_J = P_K = P_L = P_M = P_N = P_O = P_P = P_H;
    }
  
    if (block_available_left)
    {
      P_Q = imgY[pix_a[0].pos_y][pix_a[0].pos_x];
      P_R = imgY[pix_a[1].pos_y][pix_a[1].pos_x];
      P_S = imgY[pix_a[2].pos_y][pix_a[2].pos_x];
      P_T = imgY[pix_a[3].pos_y][pix_a[3].pos_x];
      P_U = imgY[pix_a[4].pos_y][pix_a[4].pos_x];
      P_V = imgY[pix_a[5].pos_y][pix_a[5].pos_x];
      P_W = imgY[pix_a[6].pos_y][pix_a[6].pos_x];
      P_X = imgY[pix_a[7].pos_y][pix_a[7].pos_x];
    }
    else
    {
      P_Q = P_R = P_S = P_T = P_U = P_V = P_W = P_X = img->dc_pred_value;
    }
  
    if (block_available_up_left)
    {
      P_Z = imgY[pix_d.pos_y][pix_d.pos_x];
    }
    else
    {
      P_Z = img->dc_pred_value;
    }
    
    LowPassForIntra8x8Pred(&(P_Z), block_available_up_left, block_available_up, block_available_left);
  
  //img->mpr[x][y]
    switch(predmode)
    {
    case DC_PRED:
      s0 = 0;
      if (block_available_up && block_available_left)
      {   
        // no edge
        s0 = (P_A + P_B + P_C + P_D + P_E + P_F + P_G + P_H + P_Q + P_R + P_S + P_T + P_U + P_V + P_W + P_X + 8) >> 4;
      }
      else if (!block_available_up && block_available_left)
      {
        // upper edge
        s0 = (P_Q + P_R + P_S + P_T + P_U + P_V + P_W + P_X + 4) >> 3;             
      }
      else if (block_available_up && !block_available_left)
      {
        // left edge
        s0 = (P_A + P_B + P_C + P_D + P_E + P_F + P_G + P_H + 4) >> 3;             
      }
      else //if (!block_available_up && !block_available_left)
      {
        // top left corner, nothing to predict from
        s0 = img->dc_pred_value;                           
      }
      for(i = 0; i < 2*BLOCK_SIZE; i++)
        for(j = 0; j < 2*BLOCK_SIZE; j++)
          img->mpr[i+ioff][j+joff] = s0;
      break;
  
    case VERT_PRED:
      if (!block_available_up)
        printf ("warning: Intra_8x8_Vertical prediction mode not allowed at mb %d\n",img->current_mb_nr);
  
      for (i=0; i < 2*BLOCK_SIZE; i++)
      {
        img->mpr[i+ioff][0+joff] = 
        img->mpr[i+ioff][1+joff] = 
        img->mpr[i+ioff][2+joff] = 
        img->mpr[i+ioff][3+joff] = 
        img->mpr[i+ioff][4+joff] = 
        img->mpr[i+ioff][5+joff] = 
        img->mpr[i+ioff][6+joff] = 
        img->mpr[i+ioff][7+joff] = (&P_A)[i];
      }
      break;
    case HOR_PRED:
      if (!block_available_left)
        printf ("warning: Intra_8x8_Horizontal prediction mode not allowed at mb %d\n",img->current_mb_nr);
  
      for (j=0; j < 2*BLOCK_SIZE; j++)
      {
        img->mpr[0+ioff][j+joff]  = 
        img->mpr[1+ioff][j+joff]  = 
        img->mpr[2+ioff][j+joff]  = 
        img->mpr[3+ioff][j+joff]  = 
        img->mpr[4+ioff][j+joff]  = 
        img->mpr[5+ioff][j+joff]  = 
        img->mpr[6+ioff][j+joff]  = 
        img->mpr[7+ioff][j+joff]  = (&P_Q)[j];
      }
      break;
  
    case DIAG_DOWN_LEFT_PRED:
      if (!block_available_up)
        printf ("warning: Intra_8x8_Diagonal_Down_Left prediction mode not allowed at mb %d\n",img->current_mb_nr);
      // Mode DIAG_DOWN_LEFT_PRED
      img->mpr[0+ioff][0+joff] = (P_A + P_C + 2*(P_B) + 2) >> 2;
      img->mpr[0+ioff][1+joff] = 
      img->mpr[1+ioff][0+joff] = (P_B + P_D + 2*(P_C) + 2) >> 2;
      img->mpr[0+ioff][2+joff] =
      img->mpr[1+ioff][1+joff] =
      img->mpr[2+ioff][0+joff] = (P_C + P_E + 2*(P_D) + 2) >> 2;
      img->mpr[0+ioff][3+joff] = 
      img->mpr[1+ioff][2+joff] = 
      img->mpr[2+ioff][1+joff] = 
      img->mpr[3+ioff][0+joff] = (P_D + P_F + 2*(P_E) + 2) >> 2;
      img->mpr[0+ioff][4+joff] = 
      img->mpr[1+ioff][3+joff] = 
      img->mpr[2+ioff][2+joff] = 
      img->mpr[3+ioff][1+joff] = 
      img->mpr[4+ioff][0+joff] = (P_E + P_G + 2*(P_F) + 2) >> 2;
      img->mpr[0+ioff][5+joff] = 
      img->mpr[1+ioff][4+joff] = 
      img->mpr[2+ioff][3+joff] = 
      img->mpr[3+ioff][2+joff] = 
      img->mpr[4+ioff][1+joff] = 
      img->mpr[5+ioff][0+joff] = (P_F + P_H + 2*(P_G) + 2) >> 2;
      img->mpr[0+ioff][6+joff] = 
      img->mpr[1+ioff][5+joff] = 
      img->mpr[2+ioff][4+joff] = 
      img->mpr[3+ioff][3+joff] = 
      img->mpr[4+ioff][2+joff] = 
      img->mpr[5+ioff][1+joff] = 
      img->mpr[6+ioff][0+joff] = (P_G + P_I + 2*(P_H) + 2) >> 2;
      img->mpr[0+ioff][7+joff] = 
      img->mpr[1+ioff][6+joff] = 
      img->mpr[2+ioff][5+joff] = 
      img->mpr[3+ioff][4+joff] = 
      img->mpr[4+ioff][3+joff] = 
      img->mpr[5+ioff][2+joff] = 
      img->mpr[6+ioff][1+joff] = 
      img->mpr[7+ioff][0+joff] = (P_H + P_J + 2*(P_I) + 2) >> 2;
      img->mpr[1+ioff][7+joff] = 
      img->mpr[2+ioff][6+joff] = 
      img->mpr[3+ioff][5+joff] = 
      img->mpr[4+ioff][4+joff] = 
      img->mpr[5+ioff][3+joff] = 
      img->mpr[6+ioff][2+joff] = 
      img->mpr[7+ioff][1+joff] = (P_I + P_K + 2*(P_J) + 2) >> 2;
      img->mpr[2+ioff][7+joff] = 
      img->mpr[3+ioff][6+joff] = 
      img->mpr[4+ioff][5+joff] = 
      img->mpr[5+ioff][4+joff] = 
      img->mpr[6+ioff][3+joff] = 
      img->mpr[7+ioff][2+joff] = (P_J + P_L + 2*(P_K) + 2) >> 2;
      img->mpr[3+ioff][7+joff] = 
      img->mpr[4+ioff][6+joff] = 
      img->mpr[5+ioff][5+joff] = 
      img->mpr[6+ioff][4+joff] = 
      img->mpr[7+ioff][3+joff] = (P_K + P_M + 2*(P_L) + 2) >> 2;
      img->mpr[4+ioff][7+joff] = 
      img->mpr[5+ioff][6+joff] = 
      img->mpr[6+ioff][5+joff] = 
      img->mpr[7+ioff][4+joff] = (P_L + P_N + 2*(P_M) + 2) >> 2;
      img->mpr[5+ioff][7+joff] = 
      img->mpr[6+ioff][6+joff] = 
      img->mpr[7+ioff][5+joff] = (P_M + P_O + 2*(P_N) + 2) >> 2;
      img->mpr[6+ioff][7+joff] = 
      img->mpr[7+ioff][6+joff] = (P_N + P_P + 2*(P_O) + 2) >> 2;
      img->mpr[7+ioff][7+joff] = (P_O + 3*(P_P) + 2) >> 2;
      break;
  
    case VERT_LEFT_PRED:
      if (!block_available_up)
        printf ("warning: Intra_4x4_Vertical_Left prediction mode not allowed at mb %d\n",img->current_mb_nr);
  
      img->mpr[0+ioff][0+joff] = (P_A + P_B + 1) >> 1;
      img->mpr[1+ioff][0+joff] = 
      img->mpr[0+ioff][2+joff] = (P_B + P_C + 1) >> 1;
      img->mpr[2+ioff][0+joff] = 
      img->mpr[1+ioff][2+joff] = 
      img->mpr[0+ioff][4+joff] = (P_C + P_D + 1) >> 1;
      img->mpr[3+ioff][0+joff] = 
      img->mpr[2+ioff][2+joff] = 
      img->mpr[1+ioff][4+joff] = 
      img->mpr[0+ioff][6+joff] = (P_D + P_E + 1) >> 1;
      img->mpr[4+ioff][0+joff] = 
      img->mpr[3+ioff][2+joff] = 
      img->mpr[2+ioff][4+joff] = 
      img->mpr[1+ioff][6+joff] = (P_E + P_F + 1) >> 1;
      img->mpr[5+ioff][0+joff] = 
      img->mpr[4+ioff][2+joff] = 
      img->mpr[3+ioff][4+joff] = 
      img->mpr[2+ioff][6+joff] = (P_F + P_G + 1) >> 1;
      img->mpr[6+ioff][0+joff] = 
      img->mpr[5+ioff][2+joff] = 
      img->mpr[4+ioff][4+joff] = 
      img->mpr[3+ioff][6+joff] = (P_G + P_H + 1) >> 1;
      img->mpr[7+ioff][0+joff] = 
      img->mpr[6+ioff][2+joff] = 
      img->mpr[5+ioff][4+joff] = 
      img->mpr[4+ioff][6+joff] = (P_H + P_I + 1) >> 1;
      img->mpr[7+ioff][2+joff] = 
      img->mpr[6+ioff][4+joff] = 
      img->mpr[5+ioff][6+joff] = (P_I + P_J + 1) >> 1;
      img->mpr[7+ioff][4+joff] = 
      img->mpr[6+ioff][6+joff] = (P_J + P_K + 1) >> 1;
      img->mpr[7+ioff][6+joff] = (P_K + P_L + 1) >> 1;
      img->mpr[0+ioff][1+joff] = (P_A + P_C + 2*P_B + 2) >> 2;
      img->mpr[1+ioff][1+joff] = 
      img->mpr[0+ioff][3+joff] = (P_B + P_D + 2*P_C + 2) >> 2;
      img->mpr[2+ioff][1+joff] = 
      img->mpr[1+ioff][3+joff] = 
      img->mpr[0+ioff][5+joff] = (P_C + P_E + 2*P_D + 2) >> 2;
      img->mpr[3+ioff][1+joff] = 
      img->mpr[2+ioff][3+joff] = 
      img->mpr[1+ioff][5+joff] = 
      img->mpr[0+ioff][7+joff] = (P_D + P_F + 2*P_E + 2) >> 2;
      img->mpr[4+ioff][1+joff] = 
      img->mpr[3+ioff][3+joff] = 
      img->mpr[2+ioff][5+joff] = 
      img->mpr[1+ioff][7+joff] = (P_E + P_G + 2*P_F + 2) >> 2;
      img->mpr[5+ioff][1+joff] = 
      img->mpr[4+ioff][3+joff] = 
      img->mpr[3+ioff][5+joff] = 
      img->mpr[2+ioff][7+joff] = (P_F + P_H + 2*P_G + 2) >> 2;
      img->mpr[6+ioff][1+joff] = 
      img->mpr[5+ioff][3+joff] = 
      img->mpr[4+ioff][5+joff] = 
      img->mpr[3+ioff][7+joff] = (P_G + P_I + 2*P_H + 2) >> 2;
      img->mpr[7+ioff][1+joff] = 
      img->mpr[6+ioff][3+joff] = 
      img->mpr[5+ioff][5+joff] = 
      img->mpr[4+ioff][7+joff] = (P_H + P_J + 2*P_I + 2) >> 2;
      img->mpr[7+ioff][3+joff] = 
      img->mpr[6+ioff][5+joff] = 
      img->mpr[5+ioff][7+joff] = (P_I + P_K + 2*P_J + 2) >> 2;
      img->mpr[7+ioff][5+joff] = 
      img->mpr[6+ioff][7+joff] = (P_J + P_L + 2*P_K + 2) >> 2;
      img->mpr[7+ioff][7+joff] = (P_K + P_M + 2*P_L + 2) >> 2;
      break;
  
  
    case DIAG_DOWN_RIGHT_PRED:
      if ((!block_available_up)||(!block_available_left)||(!block_available_up_left))
        printf ("warning: Intra_8x8_Diagonal_Down_Right prediction mode not allowed at mb %d\n",img->current_mb_nr);
  
      // Mode DIAG_DOWN_RIGHT_PRED
      img->mpr[0+ioff][7+joff] = (P_X + P_V + 2*(P_W) + 2) >> 2;
      img->mpr[0+ioff][6+joff] = 
      img->mpr[1+ioff][7+joff] = (P_W + P_U + 2*(P_V) + 2) >> 2;
      img->mpr[0+ioff][5+joff] = 
      img->mpr[1+ioff][6+joff] = 
      img->mpr[2+ioff][7+joff] = (P_V + P_T + 2*(P_U) + 2) >> 2;
      img->mpr[0+ioff][4+joff] = 
      img->mpr[1+ioff][5+joff] = 
      img->mpr[2+ioff][6+joff] = 
      img->mpr[3+ioff][7+joff] = (P_U + P_S + 2*(P_T) + 2) >> 2;
      img->mpr[0+ioff][3+joff] = 
      img->mpr[1+ioff][4+joff] = 
      img->mpr[2+ioff][5+joff] = 
      img->mpr[3+ioff][6+joff] = 
      img->mpr[4+ioff][7+joff] = (P_T + P_R + 2*(P_S) + 2) >> 2;
      img->mpr[0+ioff][2+joff] = 
      img->mpr[1+ioff][3+joff] = 
      img->mpr[2+ioff][4+joff] = 
      img->mpr[3+ioff][5+joff] = 
      img->mpr[4+ioff][6+joff] = 
      img->mpr[5+ioff][7+joff] = (P_S + P_Q + 2*(P_R) + 2) >> 2;
      img->mpr[0+ioff][1+joff] = 
      img->mpr[1+ioff][2+joff] = 
      img->mpr[2+ioff][3+joff] = 
      img->mpr[3+ioff][4+joff] = 
      img->mpr[4+ioff][5+joff] = 
      img->mpr[5+ioff][6+joff] = 
      img->mpr[6+ioff][7+joff] = (P_R + P_Z + 2*(P_Q) + 2) >> 2;
      img->mpr[0+ioff][0+joff] = 
      img->mpr[1+ioff][1+joff] = 
      img->mpr[2+ioff][2+joff] = 
      img->mpr[3+ioff][3+joff] = 
      img->mpr[4+ioff][4+joff] = 
      img->mpr[5+ioff][5+joff] = 
      img->mpr[6+ioff][6+joff] = 
      img->mpr[7+ioff][7+joff] = (P_Q + P_A + 2*(P_Z) + 2) >> 2;
      img->mpr[1+ioff][0+joff] = 
      img->mpr[2+ioff][1+joff] = 
      img->mpr[3+ioff][2+joff] = 
      img->mpr[4+ioff][3+joff] = 
      img->mpr[5+ioff][4+joff] = 
      img->mpr[6+ioff][5+joff] = 
      img->mpr[7+ioff][6+joff] = (P_Z + P_B + 2*(P_A) + 2) >> 2;
      img->mpr[2+ioff][0+joff] = 
      img->mpr[3+ioff][1+joff] = 
      img->mpr[4+ioff][2+joff] = 
      img->mpr[5+ioff][3+joff] = 
      img->mpr[6+ioff][4+joff] = 
      img->mpr[7+ioff][5+joff] = (P_A + P_C + 2*(P_B) + 2) >> 2;
      img->mpr[3+ioff][0+joff] = 
      img->mpr[4+ioff][1+joff] = 
      img->mpr[5+ioff][2+joff] = 
      img->mpr[6+ioff][3+joff] = 
      img->mpr[7+ioff][4+joff] = (P_B + P_D + 2*(P_C) + 2) >> 2;
      img->mpr[4+ioff][0+joff] = 
      img->mpr[5+ioff][1+joff] = 
      img->mpr[6+ioff][2+joff] = 
      img->mpr[7+ioff][3+joff] = (P_C + P_E + 2*(P_D) + 2) >> 2;
      img->mpr[5+ioff][0+joff] = 
      img->mpr[6+ioff][1+joff] = 
      img->mpr[7+ioff][2+joff] = (P_D + P_F + 2*(P_E) + 2) >> 2;
      img->mpr[6+ioff][0+joff] = 
      img->mpr[7+ioff][1+joff] = (P_E + P_G + 2*(P_F) + 2) >> 2;
      img->mpr[7+ioff][0+joff] = (P_F + P_H + 2*(P_G) + 2) >> 2;
      break;
  
    case  VERT_RIGHT_PRED:/* diagonal prediction -22.5 deg to horizontal plane */
      if ((!block_available_up)||(!block_available_left)||(!block_available_up_left))
        printf ("warning: Intra_8x8_Vertical_Right prediction mode not allowed at mb %d\n",img->current_mb_nr);
  
      img->mpr[0+ioff][0+joff] = 
      img->mpr[1+ioff][2+joff] = 
      img->mpr[2+ioff][4+joff] = 
      img->mpr[3+ioff][6+joff] = (P_Z + P_A + 1) >> 1;
      img->mpr[1+ioff][0+joff] = 
      img->mpr[2+ioff][2+joff] = 
      img->mpr[3+ioff][4+joff] = 
      img->mpr[4+ioff][6+joff] = (P_A + P_B + 1) >> 1;
      img->mpr[2+ioff][0+joff] = 
      img->mpr[3+ioff][2+joff] = 
      img->mpr[4+ioff][4+joff] = 
      img->mpr[5+ioff][6+joff] = (P_B + P_C + 1) >> 1;
      img->mpr[3+ioff][0+joff] = 
      img->mpr[4+ioff][2+joff] = 
      img->mpr[5+ioff][4+joff] = 
      img->mpr[6+ioff][6+joff] = (P_C + P_D + 1) >> 1;
      img->mpr[4+ioff][0+joff] = 
      img->mpr[5+ioff][2+joff] = 
      img->mpr[6+ioff][4+joff] = 
      img->mpr[7+ioff][6+joff] = (P_D + P_E + 1) >> 1;
      img->mpr[5+ioff][0+joff] = 
      img->mpr[6+ioff][2+joff] = 
      img->mpr[7+ioff][4+joff] = (P_E + P_F + 1) >> 1;
      img->mpr[6+ioff][0+joff] = 
      img->mpr[7+ioff][2+joff] = (P_F + P_G + 1) >> 1;
      img->mpr[7+ioff][0+joff] = (P_G + P_H + 1) >> 1;
      img->mpr[0+ioff][1+joff] = 
      img->mpr[1+ioff][3+joff] = 
      img->mpr[2+ioff][5+joff] = 
      img->mpr[3+ioff][7+joff] = (P_Q + P_A + 2*P_Z + 2) >> 2;
      img->mpr[1+ioff][1+joff] = 
      img->mpr[2+ioff][3+joff] = 
      img->mpr[3+ioff][5+joff] = 
      img->mpr[4+ioff][7+joff] = (P_Z + P_B + 2*P_A + 2) >> 2;
      img->mpr[2+ioff][1+joff] = 
      img->mpr[3+ioff][3+joff] = 
      img->mpr[4+ioff][5+joff] = 
      img->mpr[5+ioff][7+joff] = (P_A + P_C + 2*P_B + 2) >> 2;
      img->mpr[3+ioff][1+joff] = 
      img->mpr[4+ioff][3+joff] = 
      img->mpr[5+ioff][5+joff] = 
      img->mpr[6+ioff][7+joff] = (P_B + P_D + 2*P_C + 2) >> 2;
      img->mpr[4+ioff][1+joff] = 
      img->mpr[5+ioff][3+joff] = 
      img->mpr[6+ioff][5+joff] = 
      img->mpr[7+ioff][7+joff] = (P_C + P_E + 2*P_D + 2) >> 2;
      img->mpr[5+ioff][1+joff] = 
      img->mpr[6+ioff][3+joff] = 
      img->mpr[7+ioff][5+joff] = (P_D + P_F + 2*P_E + 2) >> 2;
      img->mpr[6+ioff][1+joff] = 
      img->mpr[7+ioff][3+joff] = (P_E + P_G + 2*P_F + 2) >> 2;
      img->mpr[7+ioff][1+joff] = (P_F + P_H + 2*P_G + 2) >> 2;
      img->mpr[0+ioff][2+joff] =
      img->mpr[1+ioff][4+joff] =
      img->mpr[2+ioff][6+joff] = (P_R + P_Z + 2*P_Q + 2) >> 2;
      img->mpr[0+ioff][3+joff] =
      img->mpr[1+ioff][5+joff] =
      img->mpr[2+ioff][7+joff] = (P_S + P_Q + 2*P_R + 2) >> 2;
      img->mpr[0+ioff][4+joff] =
      img->mpr[1+ioff][6+joff] = (P_T + P_R + 2*P_S + 2) >> 2;
      img->mpr[0+ioff][5+joff] =
      img->mpr[1+ioff][7+joff] = (P_U + P_S + 2*P_T + 2) >> 2;
      img->mpr[0+ioff][6+joff] = (P_V + P_T + 2*P_U + 2) >> 2;
      img->mpr[0+ioff][7+joff] = (P_W + P_U + 2*P_V + 2) >> 2;
      break;
  
    case  HOR_DOWN_PRED:/* diagonal prediction -22.5 deg to horizontal plane */
      if ((!block_available_up)||(!block_available_left)||(!block_available_up_left))
        printf ("warning: Intra_8x8_Horizontal_Down prediction mode not allowed at mb %d\n",img->current_mb_nr);
      
      img->mpr[0+ioff][0+joff] = 
      img->mpr[2+ioff][1+joff] = 
      img->mpr[4+ioff][2+joff] = 
      img->mpr[6+ioff][3+joff] = (P_Q + P_Z + 1) >> 1;
      img->mpr[0+ioff][1+joff] = 
      img->mpr[2+ioff][2+joff] = 
      img->mpr[4+ioff][3+joff] = 
      img->mpr[6+ioff][4+joff] = (P_R + P_Q + 1) >> 1;
      img->mpr[0+ioff][2+joff] = 
      img->mpr[2+ioff][3+joff] = 
      img->mpr[4+ioff][4+joff] = 
      img->mpr[6+ioff][5+joff] = (P_S + P_R + 1) >> 1;
      img->mpr[0+ioff][3+joff] = 
      img->mpr[2+ioff][4+joff] = 
      img->mpr[4+ioff][5+joff] = 
      img->mpr[6+ioff][6+joff] = (P_T + P_S + 1) >> 1;
      img->mpr[0+ioff][4+joff] = 
      img->mpr[2+ioff][5+joff] = 
      img->mpr[4+ioff][6+joff] = 
      img->mpr[6+ioff][7+joff] = (P_U + P_T + 1) >> 1;
      img->mpr[0+ioff][5+joff] = 
      img->mpr[2+ioff][6+joff] = 
      img->mpr[4+ioff][7+joff] = (P_V + P_U + 1) >> 1;
      img->mpr[0+ioff][6+joff] = 
      img->mpr[2+ioff][7+joff] = (P_W + P_V + 1) >> 1;
      img->mpr[0+ioff][7+joff] = (P_X + P_W + 1) >> 1;
      img->mpr[1+ioff][0+joff] =
      img->mpr[3+ioff][1+joff] =
      img->mpr[5+ioff][2+joff] =
      img->mpr[7+ioff][3+joff] = (P_Q + P_A + 2*P_Z + 2) >> 2;
      img->mpr[1+ioff][1+joff] =
      img->mpr[3+ioff][2+joff] =
      img->mpr[5+ioff][3+joff] =
      img->mpr[7+ioff][4+joff] = (P_Z + P_R + 2*P_Q + 2) >> 2;
      img->mpr[1+ioff][2+joff] =
      img->mpr[3+ioff][3+joff] =
      img->mpr[5+ioff][4+joff] =
      img->mpr[7+ioff][5+joff] = (P_Q + P_S + 2*P_R + 2) >> 2;
      img->mpr[1+ioff][3+joff] =
      img->mpr[3+ioff][4+joff] =
      img->mpr[5+ioff][5+joff] =
      img->mpr[7+ioff][6+joff] = (P_R + P_T + 2*P_S + 2) >> 2;
      img->mpr[1+ioff][4+joff] =
      img->mpr[3+ioff][5+joff] =
      img->mpr[5+ioff][6+joff] =
      img->mpr[7+ioff][7+joff] = (P_S + P_U + 2*P_T + 2) >> 2;
      img->mpr[1+ioff][5+joff] =
      img->mpr[3+ioff][6+joff] =
      img->mpr[5+ioff][7+joff] = (P_T + P_V + 2*P_U + 2) >> 2;
      img->mpr[1+ioff][6+joff] =
      img->mpr[3+ioff][7+joff] = (P_U + P_W + 2*P_V + 2) >> 2;
      img->mpr[1+ioff][7+joff] = (P_V + P_X + 2*P_W + 2) >> 2;
      img->mpr[2+ioff][0+joff] = 
      img->mpr[4+ioff][1+joff] = 
      img->mpr[6+ioff][2+joff] = (P_Z + P_B + 2*P_A + 2) >> 2;
      img->mpr[3+ioff][0+joff] = 
      img->mpr[5+ioff][1+joff] = 
      img->mpr[7+ioff][2+joff] = (P_A + P_C + 2*P_B + 2) >> 2;
      img->mpr[4+ioff][0+joff] = 
      img->mpr[6+ioff][1+joff] = (P_B + P_D + 2*P_C + 2) >> 2;
      img->mpr[5+ioff][0+joff] = 
      img->mpr[7+ioff][1+joff] = (P_C + P_E + 2*P_D + 2) >> 2;
      img->mpr[6+ioff][0+joff] = (P_D + P_F + 2*P_E + 2) >> 2;
      img->mpr[7+ioff][0+joff] = (P_E + P_G + 2*P_F + 2) >> 2;
      break;
  
    case  HOR_UP_PRED:/* diagonal prediction -22.5 deg to horizontal plane */
      if (!block_available_left)
        printf ("warning: Intra_8x8_Horizontal_Up prediction mode not allowed at mb %d\n",img->current_mb_nr);
  
      img->mpr[0+ioff][0+joff] = (P_Q + P_R + 1) >> 1;
      img->mpr[0+ioff][1+joff] =
      img->mpr[2+ioff][0+joff] = (P_R + P_S + 1) >> 1;
      img->mpr[0+ioff][2+joff] =
      img->mpr[2+ioff][1+joff] =
      img->mpr[4+ioff][0+joff] = (P_S + P_T + 1) >> 1;
      img->mpr[0+ioff][3+joff] =
      img->mpr[2+ioff][2+joff] =
      img->mpr[4+ioff][1+joff] =
      img->mpr[6+ioff][0+joff] = (P_T + P_U + 1) >> 1;
      img->mpr[0+ioff][4+joff] =
      img->mpr[2+ioff][3+joff] =
      img->mpr[4+ioff][2+joff] =
      img->mpr[6+ioff][1+joff] = (P_U + P_V + 1) >> 1;
      img->mpr[0+ioff][5+joff] =
      img->mpr[2+ioff][4+joff] =
      img->mpr[4+ioff][3+joff] =
      img->mpr[6+ioff][2+joff] = (P_V + P_W + 1) >> 1;
      img->mpr[0+ioff][6+joff] =
      img->mpr[2+ioff][5+joff] =
      img->mpr[4+ioff][4+joff] =
      img->mpr[6+ioff][3+joff] = (P_W + P_X + 1) >> 1;
      img->mpr[6+ioff][4+joff] =
        img->mpr[7+ioff][4+joff] =
        img->mpr[4+ioff][5+joff] =
        img->mpr[5+ioff][5+joff] =
        img->mpr[6+ioff][5+joff] =
        img->mpr[7+ioff][5+joff] =
        img->mpr[2+ioff][6+joff] =
        img->mpr[3+ioff][6+joff] =
        img->mpr[4+ioff][6+joff] =
        img->mpr[5+ioff][6+joff] =
        img->mpr[6+ioff][6+joff] =
        img->mpr[7+ioff][6+joff] =
        img->mpr[0+ioff][7+joff] =
        img->mpr[1+ioff][7+joff] =
        img->mpr[2+ioff][7+joff] =
        img->mpr[3+ioff][7+joff] =
        img->mpr[4+ioff][7+joff] =
        img->mpr[5+ioff][7+joff] =
        img->mpr[6+ioff][7+joff] =
        img->mpr[7+ioff][7+joff] = P_X;
      img->mpr[1+ioff][6+joff] =
        img->mpr[3+ioff][5+joff] =
        img->mpr[5+ioff][4+joff] =
        img->mpr[7+ioff][3+joff] = (P_W + 3*P_X + 2) >> 2;
      img->mpr[1+ioff][5+joff] =
        img->mpr[3+ioff][4+joff] =
        img->mpr[5+ioff][3+joff] =
        img->mpr[7+ioff][2+joff] = (P_X + P_V + 2*P_W + 2) >> 2;
      img->mpr[1+ioff][4+joff] =
        img->mpr[3+ioff][3+joff] =
        img->mpr[5+ioff][2+joff] =
        img->mpr[7+ioff][1+joff] = (P_W + P_U + 2*P_V + 2) >> 2;
      img->mpr[1+ioff][3+joff] =
        img->mpr[3+ioff][2+joff] =
        img->mpr[5+ioff][1+joff] =
        img->mpr[7+ioff][0+joff] = (P_V + P_T + 2*P_U + 2) >> 2;
      img->mpr[1+ioff][2+joff] =
        img->mpr[3+ioff][1+joff] =
        img->mpr[5+ioff][0+joff] = (P_U + P_S + 2*P_T + 2) >> 2;
      img->mpr[1+ioff][1+joff] =
        img->mpr[3+ioff][0+joff] = (P_T + P_R + 2*P_S + 2) >> 2;
      img->mpr[1+ioff][0+joff] = (P_S + P_Q + 2*P_R + 2) >> 2;
      break;
      
    default:
      printf("Error: illegal intra_4x4 prediction mode: %d\n",predmode);
      return SEARCH_SYNC;
      break;
    }
    return DECODING_OK;
  }
  
  
  
  /*! 
   *************************************************************************************
   * \brief
   *    Prefiltering for Intra8x8 prediction
   *************************************************************************************
   */
  void LowPassForIntra8x8Pred(int *PredPel, int block_up_left, int block_up, int block_left)
  {
    int i;
    int LoopArray[25];
   
  
    for(i = 0; i < 25; i++)
       LoopArray[i] = PredPel[i] ;
  
   	if(block_up)
  	{
  		if(block_up_left) 
  		{
  			LoopArray[1] = ((&P_Z)[0] + ((&P_Z)[1]<<1) + (&P_Z)[2] + 2)>>2;
  		}
  		else
  			LoopArray[1] = ((&P_Z)[1] + ((&P_Z)[1]<<1) + (&P_Z)[2] + 2)>>2; 
  
  
  		for(i = 2; i <16; i++)
  		{
  			LoopArray[i] = ((&P_Z)[i-1] + ((&P_Z)[i]<<1) + (&P_Z)[i+1] + 2)>>2;
  		}
  		LoopArray[16] = (P_P + (P_P<<1) + P_O + 2)>>2;
  	}
  
  	if(block_up_left) 
  	{
  		
  		if(block_up && block_left)
  		{
  				LoopArray[0] = (P_Q + (P_Z<<1) + P_A +2)>>2;
  		}
  		else
  		{
  			if(block_up)
  				LoopArray[0] = (P_Z + (P_Z<<1) + P_A +2)>>2;
  			else
  				if(block_left)
  					LoopArray[0] = (P_Z + (P_Z<<1) + P_Q +2)>>2;
  		}
  
  	}
  
  	if(block_left)
  	{
  		if(block_up_left)
  			LoopArray[17] = (P_Z + (P_Q<<1) + P_R + 2)>>2; 
  		else
  			LoopArray[17] = (P_Q + (P_Q<<1) + P_R + 2)>>2;
  
  		for(i = 18; i <24; i++)
  		{
  			LoopArray[i] = ((&P_Z)[i-1] + ((&P_Z)[i]<<1) + (&P_Z)[i+1] + 2)>>2;
  		}
  		LoopArray[24] = (P_W + (P_X<<1) + P_X + 2)>>2;
  	}
  
    for(i = 0; i < 25; i++)
      PredPel[i] = LoopArray[i];
  }
  
  
  
  /*!
   ***********************************************************************
   * \brief
   *    Inverse 8x8 transformation
   ***********************************************************************
   */
  void itrans8x8(struct img_par *img, //!< image parameters
                int ioff,            //!< index to 4x4 block
                int joff)            //!<
  {
    int i,j;
    int m6[8][8];
    Boolean lossless_qpprime = ((img->qp + img->bitdepth_luma_qp_scale)==0 && img->lossless_qpprime_flag==1);
  
    int residue_transform_flag = img->residue_transform_flag;
  
  
    for( i=0; i<8 && !lossless_qpprime; i++)
    {
      int a[8], b[8];
      a[0] = img->m7[ioff + 0][joff + i] + img->m7[ioff + 4][joff + i];
      a[4] = img->m7[ioff + 0][joff + i] - img->m7[ioff + 4][joff + i];
      a[2] = (img->m7[ioff + 2][joff + i]>>1) - img->m7[ioff + 6][joff + i];
      a[6] = img->m7[ioff + 2][joff + i] + (img->m7[ioff + 6][joff + i]>>1);
  
      b[0] = a[0] + a[6];
      b[2] = a[4] + a[2];
      b[4] = a[4] - a[2];
      b[6] = a[0] - a[6];
  
      a[1] = -img->m7[ioff + 3][joff + i] + img->m7[ioff + 5][joff + i] - img->m7[ioff + 7][joff + i] - (img->m7[ioff + 7][joff + i]>>1);
      a[3] = img->m7[ioff + 1][joff + i] + img->m7[ioff + 7][joff + i] - img->m7[ioff + 3][joff + i] - (img->m7[ioff + 3][joff + i]>>1);
      a[5] = -img->m7[ioff + 1][joff + i] + img->m7[ioff + 7][joff + i] + img->m7[ioff + 5][joff + i] + (img->m7[ioff + 5][joff + i]>>1);
      a[7] = img->m7[ioff + 3][joff + i] + img->m7[ioff + 5][joff + i] + img->m7[ioff + 1][joff + i] + (img->m7[ioff + 1][joff + i]>>1);
  
      b[1] = a[1] + (a[7]>>2);
  //    b[7] = -(a[1]>>2 + 0) + a[7];  KS: do we need to add zero?
      b[7] = -(a[1]>>2) + a[7];
      b[3] = a[3] + (a[5]>>2);
      b[5] = (a[3]>>2) - a[5];
  
      m6[0][i] = b[0] + b[7];
      m6[1][i] = b[2] + b[5];
      m6[2][i] = b[4] + b[3];
      m6[3][i] = b[6] + b[1];
      m6[4][i] = b[6] - b[1];
      m6[5][i] = b[4] - b[3];
      m6[6][i] = b[2] - b[5];
      m6[7][i] = b[0] - b[7];
    }
    for( i=0; i<8 && !lossless_qpprime; i++)
    {
      int a[8], b[8];
      a[0] = m6[i][0] + m6[i][4];
      a[4] = m6[i][0] - m6[i][4];
      a[2] = (m6[i][2]>>1) - m6[i][6];
      a[6] = m6[i][2] + (m6[i][6]>>1);
  
      b[0] = a[0] + a[6];
      b[2] = a[4] + a[2];
      b[4] = a[4] - a[2];
      b[6] = a[0] - a[6];
  
      a[1] = -m6[i][3] + m6[i][5] - m6[i][7] - (m6[i][7]>>1);
      a[3] = m6[i][1] + m6[i][7] - m6[i][3] - (m6[i][3]>>1);
      a[5] = -m6[i][1] + m6[i][7] + m6[i][5] + (m6[i][5]>>1);
      a[7] = m6[i][3] + m6[i][5] + m6[i][1] + (m6[i][1]>>1);
  
      b[1] = a[1] + (a[7]>>2);
      b[7] = -(a[1]>>2) + a[7];
      b[3] = a[3] + (a[5]>>2);
      b[5] = (a[3]>>2) - a[5];
  
      img->m7[ioff + i][joff + 0] = b[0] + b[7];
      img->m7[ioff + i][joff + 1] = b[2] + b[5];
      img->m7[ioff + i][joff + 2] = b[4] + b[3];
      img->m7[ioff + i][joff + 3] = b[6] + b[1];
      img->m7[ioff + i][joff + 4] = b[6] - b[1];
      img->m7[ioff + i][joff + 5] = b[4] - b[3];
      img->m7[ioff + i][joff + 6] = b[2] - b[5];
      img->m7[ioff + i][joff + 7] = b[0] - b[7];
    }
    for( i=0; i<8; i++)
    {
      for( j=0; j<8; j++)
      {
        // Residue Color Transform
        if(!residue_transform_flag)
        {
          if(lossless_qpprime)
            img->m7[i+ioff][j+joff] =min(img->max_imgpel_value,max(0,img->m7[ioff + i][joff + j]+(long)img->mpr[i+ioff][j+joff]));
          else
            img->m7[i+ioff][j+joff] =min(img->max_imgpel_value,max(0,(img->m7[ioff + i][joff + j]+((long)img->mpr[i+ioff][j+joff] << DQ_BITS_8)+DQ_ROUND_8)>>DQ_BITS_8));
        }
        else
        {
          if(lossless_qpprime)
            img->m7[i+ioff][j+joff] = img->m7[ioff + i][joff + j];
          else
            img->m7[i+ioff][j+joff] =(img->m7[ioff + i][joff + j]+DQ_ROUND_8)>>DQ_BITS_8;
        }
      }
    }
  } 
  