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
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
/*
# (C) 2008 Hans de Goede <j.w.r.degoede@hhs.nl>
# This program 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.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "libv4lconvert-priv.h"
/* YUYV per line */
void v4lconvert_spca501_to_yuv420(const unsigned char *src, unsigned char *dst,
int width, int height)
{
int i,j;
unsigned long *lsrc = (unsigned long *)src;
for (i = 0; i < height; i += 2) {
/* -128 - 127 --> 0 - 255 and copy first line Y */
unsigned long *ldst = (unsigned long *)(dst + i * width);
for (j = 0; j < width; j += sizeof(long)) {
*ldst = *lsrc++;
*ldst++ ^= 0x8080808080808080ULL;
}
/* -128 - 127 --> 0 - 255 and copy 1 line U */
ldst = (unsigned long *)(dst + width * height + i * width / 4);
for (j = 0; j < width/2; j += sizeof(long)) {
*ldst = *lsrc++;
*ldst++ ^= 0x8080808080808080ULL;
}
/* -128 - 127 --> 0 - 255 and copy second line Y */
ldst = (unsigned long *)(dst + i * width + width);
for (j = 0; j < width; j += sizeof(long)) {
*ldst = *lsrc++;
*ldst++ ^= 0x8080808080808080ULL;
}
/* -128 - 127 --> 0 - 255 and copy 1 line V */
ldst = (unsigned long *)(dst + (width * height * 5) / 4 + i * width / 4);
for (j = 0; j < width/2; j += sizeof(long)) {
*ldst = *lsrc++;
*ldst++ ^= 0x8080808080808080ULL;
}
}
}
/* YYUV per line */
void v4lconvert_spca505_to_yuv420(const unsigned char *src, unsigned char *dst,
int width, int height)
{
int i,j;
unsigned long *lsrc = (unsigned long *)src;
for (i = 0; i < height; i += 2) {
/* -128 - 127 --> 0 - 255 and copy 2 lines of Y */
unsigned long *ldst = (unsigned long *)(dst + i * width);
for (j = 0; j < width*2; j += sizeof(long)) {
*ldst = *lsrc++;
*ldst++ ^= 0x8080808080808080ULL;
}
/* -128 - 127 --> 0 - 255 and copy 1 line U */
ldst = (unsigned long *)(dst + width * height + i * width / 4);
for (j = 0; j < width/2; j += sizeof(long)) {
*ldst = *lsrc++;
*ldst++ ^= 0x8080808080808080ULL;
}
/* -128 - 127 --> 0 - 255 and copy 1 line V */
ldst = (unsigned long *)(dst + (width * height * 5) / 4 + i * width / 4);
for (j = 0; j < width/2; j += sizeof(long)) {
*ldst = *lsrc++;
*ldst++ ^= 0x8080808080808080ULL;
}
}
}
/* YUVY per line */
void v4lconvert_spca508_to_yuv420(const unsigned char *src, unsigned char *dst,
int width, int height)
{
int i,j;
unsigned long *lsrc = (unsigned long *)src;
for (i = 0; i < height; i += 2) {
/* -128 - 127 --> 0 - 255 and copy first line Y */
unsigned long *ldst = (unsigned long *)(dst + i * width);
for (j = 0; j < width; j += sizeof(long)) {
*ldst = *lsrc++;
*ldst++ ^= 0x8080808080808080ULL;
}
/* -128 - 127 --> 0 - 255 and copy 1 line U */
ldst = (unsigned long *)(dst + width * height + i * width / 4);
for (j = 0; j < width/2; j += sizeof(long)) {
*ldst = *lsrc++;
*ldst++ ^= 0x8080808080808080ULL;
}
/* -128 - 127 --> 0 - 255 and copy 1 line V */
ldst = (unsigned long *)(dst + (width * height * 5) / 4 + i * width / 4);
for (j = 0; j < width/2; j += sizeof(long)) {
*ldst = *lsrc++;
*ldst++ ^= 0x8080808080808080ULL;
}
/* -128 - 127 --> 0 - 255 and copy second line Y */
ldst = (unsigned long *)(dst + i * width + width);
for (j = 0; j < width; j += sizeof(long)) {
*ldst = *lsrc++;
*ldst++ ^= 0x8080808080808080ULL;
}
}
}
|
