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
23static 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
32static 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] || p->quant_table[4][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