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 29void 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); 32void ff_vc1_pred_mv_intfr(VC1Context *v, int n, int dmv_x, int dmv_y, 33 int mvn, int r_x, int r_y, int dir); 34void ff_vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2], 35 int direct, int mvtype); 36void ff_vc1_pred_b_mv_intfi(VC1Context *v, int n, int *dmv_x, int *dmv_y, 37 int mv1, int *pred_flag); 38 39static av_always_inline int scale_mv(int value, int bfrac, int inv, int qs) 40{ 41 int n = bfrac; 42 43#if B_FRACTION_DEN==256 44 if (inv) 45 n -= 256; 46 if (!qs) 47 return 2 * ((value * n + 255) >> 9); 48 return (value * n + 128) >> 8; 49#else 50 if (inv) 51 n -= B_FRACTION_DEN; 52 if (!qs) 53 return 2 * ((value * n + B_FRACTION_DEN - 1) / (2 * B_FRACTION_DEN)); 54 return (value * n + B_FRACTION_DEN/2) / B_FRACTION_DEN; 55#endif 56} 57 58#endif /* AVCODEC_VC1_PRED_H */ 59