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 */
27static 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
43static 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)                   \
58static 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
72VP56_EDGE_FILTER(vp5, hor, 1, stride)
73VP56_EDGE_FILTER(vp5, ver, stride, 1)
74VP56_EDGE_FILTER(vp6, hor, 1, stride)
75VP56_EDGE_FILTER(vp6, ver, stride, 1)
76
77void 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
87    if (ARCH_ARM) ff_vp56dsp_init_arm(s, codec);
88}
89