Merge commit '86bfcfcf2364bc837b7bb582c66a8a15a332414f'
[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 #include "libavutil/common.h"
26
27 /* Gives very similar result than the vp6 version except in a few cases */
28 static int vp5_adjust(int v, int t)
29 {
30     int s2, s1 = v >> 31;
31     v ^= s1;
32     v -= s1;
33     v *= v < 2*t;
34     v -= t;
35     s2 = v >> 31;
36     v ^= s2;
37     v -= s2;
38     v = t - v;
39     v += s1;
40     v ^= s1;
41     return v;
42 }
43
44 static int vp6_adjust(int v, int t)
45 {
46     int V = v, s = v >> 31;
47     V ^= s;
48     V -= s;
49     if (V-t-1 >= (unsigned)(t-1))
50         return v;
51     V = 2*t - V;
52     V += s;
53     V ^= s;
54     return V;
55 }
56
57
58 #define VP56_EDGE_FILTER(pfx, suf, pix_inc, line_inc)                   \
59 static void pfx##_edge_filter_##suf(uint8_t *yuv, int stride, int t)    \
60 {                                                                       \
61     int pix2_inc = 2 * pix_inc;                                         \
62     int i, v;                                                           \
63                                                                         \
64     for (i=0; i<12; i++) {                                              \
65         v = (yuv[-pix2_inc] + 3*(yuv[0]-yuv[-pix_inc]) - yuv[pix_inc] + 4)>>3;\
66         v = pfx##_adjust(v, t);                                         \
67         yuv[-pix_inc] = av_clip_uint8(yuv[-pix_inc] + v);               \
68         yuv[0] = av_clip_uint8(yuv[0] - v);                             \
69         yuv += line_inc;                                                \
70     }                                                                   \
71 }
72
73 VP56_EDGE_FILTER(vp5, hor, 1, stride)
74 VP56_EDGE_FILTER(vp5, ver, stride, 1)
75 VP56_EDGE_FILTER(vp6, hor, 1, stride)
76 VP56_EDGE_FILTER(vp6, ver, stride, 1)
77
78 void ff_vp56dsp_init(VP56DSPContext *s, enum AVCodecID codec)
79 {
80     if (codec == AV_CODEC_ID_VP5) {
81         s->edge_filter_hor = vp5_edge_filter_hor;
82         s->edge_filter_ver = vp5_edge_filter_ver;
83     } else {
84         s->edge_filter_hor = vp6_edge_filter_hor;
85         s->edge_filter_ver = vp6_edge_filter_ver;
86
87         if (CONFIG_VP6_DECODER) {
88             s->vp6_filter_diag4 = ff_vp6_filter_diag4_c;
89         }
90     }
91
92     if (ARCH_ARM) ff_vp56dsp_init_arm(s, codec);
93     if (ARCH_X86) ff_vp56dsp_init_x86(s, codec);
94 }