1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
/*
* TAK decoder
* Copyright (c) 2015 Paul B Mahol
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/attributes.h"
#include "takdsp.h"
#include "config.h"
static void decorrelate_ls(int32_t *p1, int32_t *p2, int length)
{
int i;
for (i = 0; i < length; i++) {
int32_t a = p1[i];
int32_t b = p2[i];
p2[i] = a + b;
}
}
static void decorrelate_sr(int32_t *p1, int32_t *p2, int length)
{
int i;
for (i = 0; i < length; i++) {
int32_t a = p1[i];
int32_t b = p2[i];
p1[i] = b - a;
}
}
static void decorrelate_sm(int32_t *p1, int32_t *p2, int length)
{
int i;
for (i = 0; i < length; i++) {
int32_t a = p1[i];
int32_t b = p2[i];
a -= b >> 1;
p1[i] = a;
p2[i] = a + b;
}
}
static void decorrelate_sf(int32_t *p1, int32_t *p2, int length, int dshift, int dfactor)
{
int i;
for (i = 0; i < length; i++) {
int32_t a = p1[i];
int32_t b = p2[i];
b = (unsigned)((int)(dfactor * (unsigned)(b >> dshift) + 128) >> 8) << dshift;
p1[i] = b - a;
}
}
av_cold void ff_takdsp_init(TAKDSPContext *c)
{
c->decorrelate_ls = decorrelate_ls;
c->decorrelate_sr = decorrelate_sr;
c->decorrelate_sm = decorrelate_sm;
c->decorrelate_sf = decorrelate_sf;
if (ARCH_X86)
ff_takdsp_init_x86(c);
}
|
