/*
  * VC-1 and WMV3 decoder
  * Copyright (c) 2006-2007 Konstantin Shishkov
  * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer
  *

  * This file is part of FFmpeg.

  *

  * FFmpeg is free software; you can redistribute it and/or

  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *

  * FFmpeg is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public

  * License along with FFmpeg; if not, write to the Free Software

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef AVCODEC_VC1_PRED_H
 #define AVCODEC_VC1_PRED_H
 
 #include "vc1.h"
 #include "vc1data.h"
 
 void ff_vc1_pred_mv(VC1Context *v, int n, int dmv_x, int dmv_y,
                     int mv1, int r_x, int r_y, uint8_t* is_intra,
                     int pred_flag, int dir);
 void ff_vc1_pred_mv_intfr(VC1Context *v, int n, int dmv_x, int dmv_y,
                           int mvn, int r_x, int r_y, uint8_t* is_intra,
                           int dir);
 void ff_vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2],
                       int direct, int mvtype);
 void ff_vc1_pred_b_mv_intfi(VC1Context *v, int n, int *dmv_x, int *dmv_y,
                             int mv1, int *pred_flag);
 
 static av_always_inline int scale_mv(int value, int bfrac, int inv, int qs)
 {
     int n = bfrac;
 
 #if B_FRACTION_DEN==256
     if (inv)
         n -= 256;
     if (!qs)
         return 2 * ((value * n + 255) >> 9);
     return (value * n + 128) >> 8;
 #else
     if (inv)
         n -= B_FRACTION_DEN;
     if (!qs)
         return 2 * ((value * n + B_FRACTION_DEN - 1) / (2 * B_FRACTION_DEN));
     return (value * n + B_FRACTION_DEN/2) / B_FRACTION_DEN;
 #endif
 }
 
 #endif /* AVCODEC_VC1_PRED_H */