xref: /third_party/ffmpeg/libavcodec/vp56dsp.c (revision cabdff1a) 
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 "config.h"
25#include "config_components.h"
26#include "libavutil/attributes.h"
27#include "vp56dsp.h"
28#include "libavutil/common.h"
29
30#define VP56_EDGE_FILTER(pfx, suf, pix_inc, line_inc)                   \
31static void pfx ## _edge_filter_ ## suf(uint8_t *yuv, ptrdiff_t stride, \
32                                        int t)                          \
33{                                                                       \
34    int pix2_inc = 2 * pix_inc;                                         \
35    int i, v;                                                           \
36                                                                        \
37    for (i=0; i<12; i++) {                                              \
38        v = (yuv[-pix2_inc] + 3*(yuv[0]-yuv[-pix_inc]) - yuv[pix_inc] + 4)>>3;\
39        v = pfx##_adjust(v, t);                                         \
40        yuv[-pix_inc] = av_clip_uint8(yuv[-pix_inc] + v);               \
41        yuv[0] = av_clip_uint8(yuv[0] - v);                             \
42        yuv += line_inc;                                                \
43    }                                                                   \
44}
45
46#if CONFIG_VP5_DECODER
47/* Gives very similar result than the vp6 version except in a few cases */
48static int vp5_adjust(int v, int t)
49{
50    int s2, s1 = v >> 31;
51    v ^= s1;
52    v -= s1;
53    v *= v < 2*t;
54    v -= t;
55    s2 = v >> 31;
56    v ^= s2;
57    v -= s2;
58    v = t - v;
59    v += s1;
60    v ^= s1;
61    return v;
62}
63
64
65VP56_EDGE_FILTER(vp5, hor, 1, stride)
66VP56_EDGE_FILTER(vp5, ver, stride, 1)
67
68av_cold void ff_vp5dsp_init(VP56DSPContext *s)
69{
70    s->edge_filter_hor = vp5_edge_filter_hor;
71    s->edge_filter_ver = vp5_edge_filter_ver;
72}
73#endif /* CONFIG_VP5_DECODER */
74
75#if CONFIG_VP6_DECODER
76av_cold void ff_vp6dsp_init(VP56DSPContext *s)
77{
78    s->vp6_filter_diag4 = ff_vp6_filter_diag4_c;
79
80#if ARCH_ARM
81    ff_vp6dsp_init_arm(s);
82#elif ARCH_X86
83    ff_vp6dsp_init_x86(s);
84#endif
85}
86#endif /* CONFIG_VP6_DECODER */
87