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  1. /*
  2.  * VC-1 and WMV3 decoder
  3.  * Copyright (c) 2006-2007 Konstantin Shishkov
  4.  * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg is free software; you can redistribute it and/or
  9.  * modify it under the terms of the GNU Lesser General Public
  10.  * License as published by the Free Software Foundation; either
  11.  * version 2.1 of the License, or (at your option) any later version.
  12.  *
  13.  * FFmpeg is distributed in the hope that it will be useful,
  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16.  * Lesser General Public License for more details.
  17.  *
  18.  * You should have received a copy of the GNU Lesser General Public
  19.  * License along with FFmpeg; if not, write to the Free Software
  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21.  */
  22.  
  23. #ifndef AVCODEC_VC1_PRED_H
  24. #define AVCODEC_VC1_PRED_H
  25.  
  26. #include "vc1.h"
  27. #include "vc1data.h"
  28.  
  29. void ff_vc1_pred_mv(VC1Context *v, int n, int dmv_x, int dmv_y,
  30.                     int mv1, int r_x, int r_y, uint8_t* is_intra,
  31.                     int pred_flag, int dir);
  32. void ff_vc1_pred_mv_intfr(VC1Context *v, int n, int dmv_x, int dmv_y,
  33.                           int mvn, int r_x, int r_y, uint8_t* is_intra,
  34.                           int dir);
  35. void ff_vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2],
  36.                       int direct, int mvtype);
  37. void ff_vc1_pred_b_mv_intfi(VC1Context *v, int n, int *dmv_x, int *dmv_y,
  38.                             int mv1, int *pred_flag);
  39.  
  40. static av_always_inline int scale_mv(int value, int bfrac, int inv, int qs)
  41. {
  42.     int n = bfrac;
  43.  
  44. #if B_FRACTION_DEN==256
  45.     if (inv)
  46.         n -= 256;
  47.     if (!qs)
  48.         return 2 * ((value * n + 255) >> 9);
  49.     return (value * n + 128) >> 8;
  50. #else
  51.     if (inv)
  52.         n -= B_FRACTION_DEN;
  53.     if (!qs)
  54.         return 2 * ((value * n + B_FRACTION_DEN - 1) / (2 * B_FRACTION_DEN));
  55.     return (value * n + B_FRACTION_DEN/2) / B_FRACTION_DEN;
  56. #endif
  57. }
  58.  
  59. #endif /* AVCODEC_VC1_PRED_H */
  60.