blob: f2ab93313a6740f32869ac38ec0ebf5610d4a11e
1 | /* |
2 | * FFV1 codec |
3 | * |
4 | * Copyright (c) 2003-2013 Michael Niedermayer <michaelni@gmx.at> |
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 | static inline int RENAME(predict)(TYPE *src, TYPE *last) |
24 | { |
25 | const int LT = last[-1]; |
26 | const int T = last[0]; |
27 | const int L = src[-1]; |
28 | |
29 | return mid_pred(L, L + T - LT, T); |
30 | } |
31 | |
32 | static inline int RENAME(get_context)(PlaneContext *p, TYPE *src, |
33 | TYPE *last, TYPE *last2) |
34 | { |
35 | const int LT = last[-1]; |
36 | const int T = last[0]; |
37 | const int RT = last[1]; |
38 | const int L = src[-1]; |
39 | |
40 | if (p->quant_table[3][127]) { |
41 | const int TT = last2[0]; |
42 | const int LL = src[-2]; |
43 | return p->quant_table[0][(L - LT) & 0xFF] + |
44 | p->quant_table[1][(LT - T) & 0xFF] + |
45 | p->quant_table[2][(T - RT) & 0xFF] + |
46 | p->quant_table[3][(LL - L) & 0xFF] + |
47 | p->quant_table[4][(TT - T) & 0xFF]; |
48 | } else |
49 | return p->quant_table[0][(L - LT) & 0xFF] + |
50 | p->quant_table[1][(LT - T) & 0xFF] + |
51 | p->quant_table[2][(T - RT) & 0xFF]; |
52 | } |
53 | |
54 |