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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 */ |