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 */
30static 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
46static 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)                   \
61static 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
75VP56_EDGE_FILTER(vp5, hor, 1, stride)
76VP56_EDGE_FILTER(vp5, ver, stride, 1)
77VP56_EDGE_FILTER(vp6, hor, 1, stride)
78VP56_EDGE_FILTER(vp6, ver, stride, 1)
79
80av_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)
93                ff_vp6dsp_init_arm(s, codec);
94            if (ARCH_X86)
95                ff_vp6dsp_init_x86(s, codec);
96        }
97    }
98}
99