| /* |
| * 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 */ |
