avcodec/idctdsp: Clear idct/idct_add for studio profile
[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
24 #include "libavutil/attributes.h"
25 #include "avcodec.h"
26 #include "vp56dsp.h"
27 #include "libavutil/common.h"
28
29 #define VP56_EDGE_FILTER(pfx, suf, pix_inc, line_inc)                   \
30 static void pfx ## _edge_filter_ ## suf(uint8_t *yuv, ptrdiff_t stride, \
31                                         int t)                          \
32 {                                                                       \
33     int pix2_inc = 2 * pix_inc;                                         \
34     int i, v;                                                           \
35                                                                         \
36     for (i=0; i<12; i++) {                                              \
37         v = (yuv[-pix2_inc] + 3*(yuv[0]-yuv[-pix_inc]) - yuv[pix_inc] + 4)>>3;\
38         v = pfx##_adjust(v, t);                                         \
39         yuv[-pix_inc] = av_clip_uint8(yuv[-pix_inc] + v);               \
40         yuv[0] = av_clip_uint8(yuv[0] - v);                             \
41         yuv += line_inc;                                                \
42     }                                                                   \
43 }
44
45 #if CONFIG_VP5_DECODER
46 /* Gives very similar result than the vp6 version except in a few cases */
47 static int vp5_adjust(int v, int t)
48 {
49     int s2, s1 = v >> 31;
50     v ^= s1;
51     v -= s1;
52     v *= v < 2*t;
53     v -= t;
54     s2 = v >> 31;
55     v ^= s2;
56     v -= s2;
57     v = t - v;
58     v += s1;
59     v ^= s1;
60     return v;
61 }
62
63
64 VP56_EDGE_FILTER(vp5, hor, 1, stride)
65 VP56_EDGE_FILTER(vp5, ver, stride, 1)
66
67 av_cold void ff_vp5dsp_init(VP56DSPContext *s)
68 {
69     s->edge_filter_hor = vp5_edge_filter_hor;
70     s->edge_filter_ver = vp5_edge_filter_ver;
71 }
72 #endif /* CONFIG_VP5_DECODER */
73
74 #if CONFIG_VP6_DECODER
75 static int vp6_adjust(int v, int t)
76 {
77     int V = v, s = v >> 31;
78     V ^= s;
79     V -= s;
80     if (V-t-1 >= (unsigned)(t-1))
81         return v;
82     V = 2*t - V;
83     V += s;
84     V ^= s;
85     return V;
86 }
87
88 VP56_EDGE_FILTER(vp6, hor, 1, stride)
89 VP56_EDGE_FILTER(vp6, ver, stride, 1)
90
91 av_cold void ff_vp6dsp_init(VP56DSPContext *s)
92 {
93     s->edge_filter_hor = vp6_edge_filter_hor;
94     s->edge_filter_ver = vp6_edge_filter_ver;
95
96     s->vp6_filter_diag4 = ff_vp6_filter_diag4_c;
97
98     if (ARCH_ARM)
99         ff_vp6dsp_init_arm(s);
100     if (ARCH_X86)
101         ff_vp6dsp_init_x86(s);
102 }
103 #endif /* CONFIG_VP6_DECODER */