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
24 #include "libavutil/attributes.h"
25 #include "avcodec.h"
26 #include "vp56dsp.h"
27 #include "libavutil/common.h"
28
29 /* Gives very similar result than the vp6 version except in a few cases */
vp5_adjust(int v,int t)30 static int vp5_adjust(int v, int t)
31 {
32 int s2, s1 = v >> 31;
33 v ^= s1;
34 v -= s1;
35 v *= v < 2*t;
36 v -= t;
37 s2 = v >> 31;
38 v ^= s2;
39 v -= s2;
40 v = t - v;
41 v += s1;
42 v ^= s1;
43 return v;
44 }
45
vp6_adjust(int v,int t)46 static int vp6_adjust(int v, int t)
47 {
48 int V = v, s = v >> 31;
49 V ^= s;
50 V -= s;
51 if (V-t-1 >= (unsigned)(t-1))
52 return v;
53 V = 2*t - V;
54 V += s;
55 V ^= s;
56 return V;
57 }
58
59
60 #define VP56_EDGE_FILTER(pfx, suf, pix_inc, line_inc) \
61 static void pfx##_edge_filter_##suf(uint8_t *yuv, int stride, int t) \
62 { \
63 int pix2_inc = 2 * pix_inc; \
64 int i, v; \
65 \
66 for (i=0; i<12; i++) { \
67 v = (yuv[-pix2_inc] + 3*(yuv[0]-yuv[-pix_inc]) - yuv[pix_inc] + 4)>>3;\
68 v = pfx##_adjust(v, t); \
69 yuv[-pix_inc] = av_clip_uint8(yuv[-pix_inc] + v); \
70 yuv[0] = av_clip_uint8(yuv[0] - v); \
71 yuv += line_inc; \
72 } \
73 }
74
75 VP56_EDGE_FILTER(vp5, hor, 1, stride)
76 VP56_EDGE_FILTER(vp5, ver, stride, 1)
77 VP56_EDGE_FILTER(vp6, hor, 1, stride)
78 VP56_EDGE_FILTER(vp6, ver, stride, 1)
79
ff_vp56dsp_init(VP56DSPContext * s,enum AVCodecID codec)80 av_cold void ff_vp56dsp_init(VP56DSPContext *s, enum AVCodecID codec)
81 {
82 if (codec == AV_CODEC_ID_VP5) {
83 s->edge_filter_hor = vp5_edge_filter_hor;
84 s->edge_filter_ver = vp5_edge_filter_ver;
85 } else {
86 s->edge_filter_hor = vp6_edge_filter_hor;
87 s->edge_filter_ver = vp6_edge_filter_ver;
88
89 if (CONFIG_VP6_DECODER) {
90 s->vp6_filter_diag4 = ff_vp6_filter_diag4_c;
91
92 #if (ARCH_ARM == 1)
93 if (ARCH_ARM)
94 ff_vp6dsp_init_arm(s, codec);
95 #endif
96 #if (ARCH_X86 == 1)
97 if (ARCH_X86)
98 ff_vp6dsp_init_x86(s, codec);
99 #endif
100 }
101 }
102 }
103