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
|
/*
# RGB and YUV crop routines
# (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 <string.h>
#include "libv4lconvert-priv.h"
static void v4lconvert_crop_rgbbgr24(unsigned char *src, unsigned char *dest,
const struct v4l2_format *src_fmt, const struct v4l2_format *dest_fmt)
{
int x;
int startx = (src_fmt->fmt.pix.width - dest_fmt->fmt.pix.width) / 2;
int starty = (src_fmt->fmt.pix.height - dest_fmt->fmt.pix.height) / 2;
src += starty * src_fmt->fmt.pix.bytesperline + 3 * startx;
for (x = 0; x < dest_fmt->fmt.pix.height; x++) {
memcpy(dest, src, dest_fmt->fmt.pix.width * 3);
src += src_fmt->fmt.pix.bytesperline;
dest += dest_fmt->fmt.pix.bytesperline;
}
}
static void v4lconvert_crop_yuv420(unsigned char *src, unsigned char *dest,
const struct v4l2_format *src_fmt, const struct v4l2_format *dest_fmt)
{
int x;
int startx = (src_fmt->fmt.pix.width - dest_fmt->fmt.pix.width) / 2;
int starty = (src_fmt->fmt.pix.height - dest_fmt->fmt.pix.height) / 2;
unsigned char *mysrc = src + starty * src_fmt->fmt.pix.bytesperline + startx;
/* Y */
for (x = 0; x < dest_fmt->fmt.pix.height; x++) {
memcpy(dest, mysrc, dest_fmt->fmt.pix.width);
mysrc += src_fmt->fmt.pix.bytesperline;
dest += dest_fmt->fmt.pix.bytesperline;
}
/* U */
mysrc = src + src_fmt->fmt.pix.height * src_fmt->fmt.pix.bytesperline +
(starty / 2) * src_fmt->fmt.pix.bytesperline / 2 + startx / 2;
for (x = 0; x < dest_fmt->fmt.pix.height / 2; x++) {
memcpy(dest, mysrc, dest_fmt->fmt.pix.width / 2);
mysrc += src_fmt->fmt.pix.bytesperline / 2;
dest += dest_fmt->fmt.pix.bytesperline / 2;
}
/* V */
mysrc = src + src_fmt->fmt.pix.height * src_fmt->fmt.pix.bytesperline * 5 / 4
+ (starty / 2) * src_fmt->fmt.pix.bytesperline / 2 + startx / 2;
for (x = 0; x < dest_fmt->fmt.pix.height / 2; x++) {
memcpy(dest, mysrc, dest_fmt->fmt.pix.width / 2);
mysrc += src_fmt->fmt.pix.bytesperline / 2;
dest += dest_fmt->fmt.pix.bytesperline / 2;
}
}
void v4lconvert_crop(unsigned char *src, unsigned char *dest,
const struct v4l2_format *src_fmt, const struct v4l2_format *dest_fmt)
{
switch (dest_fmt->fmt.pix.pixelformat) {
case V4L2_PIX_FMT_RGB24:
case V4L2_PIX_FMT_BGR24:
v4lconvert_crop_rgbbgr24(src, dest, src_fmt, dest_fmt);
break;
case V4L2_PIX_FMT_YUV420:
v4lconvert_crop_yuv420(src, dest, src_fmt, dest_fmt);
break;
}
}
|
