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/*
v4l-ioctl-test - This small utility checks VBI format
Copyright (C) 2006 Mauro Carvalho Chehab <mchehab@infradead.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <linux/videodev.h>
/* All possible parameters used on v4l ioctls */
union v4l_parms {
/* V4L1 structs */
struct vbi_format v1;
/* V4L2 structs */
struct v4l2_format v2;
};
/* All defined ioctls */
int ioctls[] = {
/* V4L ioctls */
VIDIOCGVBIFMT,/* struct vbi_format */
/* V4L2 ioctls */
VIDIOC_G_FMT,/* struct v4l2_format */
};
#define S_IOCTLS sizeof(ioctls)/sizeof(ioctls[0])
/********************************************************************/
int main (void)
{
int fd=0, ret=0;
char *device="/dev/video0";
union v4l_parms p;
if ((fd = open(device, O_RDONLY)) < 0) {
perror("Couldn't open video0");
return(-1);
}
/* V4L1 call */
memset(&p,0,sizeof(p));
ret=ioctl(fd,VIDIOCGVBIFMT, (void *) &p);
printf ("V4L1 call: ret=%i: sampling_rate=%d, samples_per_line=%d, "
"sample_format=%d, start=%d/%d, count=%d/%d, flags=%d\n", ret,
p.v1.sampling_rate,p.v1.samples_per_line, p.v1.sample_format,
p.v1.start[0],p.v1.start[1],p.v1.count[0],p.v1.count[1],p.v1.flags);
/* V4L2 call */
memset(&p,0,sizeof(p));
p.v2.type=V4L2_BUF_TYPE_VBI_CAPTURE;
ret=ioctl(fd,VIDIOC_G_FMT, (void *) &p);
printf ("V4L2 call: ret=%i: sampling_rate=%d, samples_per_line=%d, "
"sample_format=%d, offset=%d, start=%d/%d, count=%d/%d\n", ret,
p.v2.fmt.vbi.sampling_rate,p.v2.fmt.vbi.samples_per_line,
p.v2.fmt.vbi.sample_format,p.v2.fmt.vbi.offset,
p.v2.fmt.vbi.start[0],p.v2.fmt.vbi.start[1],
p.v2.fmt.vbi.count[0],p.v2.fmt.vbi.count[1]);
close (fd);
return (0);
}
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