j2kdec: move s->avctx initialization to j2kdec_init()
[ffmpeg.git] / libavcodec / vp56dsp.c
1 /*
2  * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
3  * Copyright (c) 2010 Mans Rullgard <mans@mansr.com>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21
22 #include <stdint.h>
23 #include "avcodec.h"
24 #include "vp56dsp.h"
25
26 /* Gives very similar result than the vp6 version except in a few cases */
27 static int vp5_adjust(int v, int t)
28 {
29     int s2, s1 = v >> 31;
30     v ^= s1;
31     v -= s1;
32     v *= v < 2*t;
33     v -= t;
34     s2 = v >> 31;
35     v ^= s2;
36     v -= s2;
37     v = t - v;
38     v += s1;
39     v ^= s1;
40     return v;
41 }
42
43 static int vp6_adjust(int v, int t)
44 {
45     int V = v, s = v >> 31;
46     V ^= s;
47     V -= s;
48     if (V-t-1 >= (unsigned)(t-1))
49         return v;
50     V = 2*t - V;
51     V += s;
52     V ^= s;
53     return V;
54 }
55
56
57 #define VP56_EDGE_FILTER(pfx, suf, pix_inc, line_inc)                   \
58 static void pfx##_edge_filter_##suf(uint8_t *yuv, int stride, int t)    \
59 {                                                                       \
60     int pix2_inc = 2 * pix_inc;                                         \
61     int i, v;                                                           \
62                                                                         \
63     for (i=0; i<12; i++) {                                              \
64         v = (yuv[-pix2_inc] + 3*(yuv[0]-yuv[-pix_inc]) - yuv[pix_inc] + 4)>>3;\
65         v = pfx##_adjust(v, t);                                         \
66         yuv[-pix_inc] = av_clip_uint8(yuv[-pix_inc] + v);               \
67         yuv[0] = av_clip_uint8(yuv[0] - v);                             \
68         yuv += line_inc;                                                \
69     }                                                                   \
70 }
71
72 VP56_EDGE_FILTER(vp5, hor, 1, stride)
73 VP56_EDGE_FILTER(vp5, ver, stride, 1)
74 VP56_EDGE_FILTER(vp6, hor, 1, stride)
75 VP56_EDGE_FILTER(vp6, ver, stride, 1)
76
77 void ff_vp56dsp_init(VP56DSPContext *s, enum CodecID codec)
78 {
79     if (codec == CODEC_ID_VP5) {
80         s->edge_filter_hor = vp5_edge_filter_hor;
81         s->edge_filter_ver = vp5_edge_filter_ver;
82     } else {
83         s->edge_filter_hor = vp6_edge_filter_hor;
84         s->edge_filter_ver = vp6_edge_filter_ver;
85
86         if (CONFIG_VP6_DECODER) {
87             s->vp6_filter_diag4 = ff_vp6_filter_diag4_c;
88         }
89     }
90
91     if (ARCH_ARM) ff_vp56dsp_init_arm(s, codec);
92     if (HAVE_MMX) ff_vp56dsp_init_x86(s, codec);
93 }