blob: 4d47f86696917f512f47c6288d618b7d172326a0
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 |