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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (c) 2009 Filippo Argiolas <filippo.argiolas@gmail.com>
*/
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <linux/videodev2.h>
#include "build.h"
#include "fd-util.h"
#include "main-func.h"
static const char *arg_device = NULL;
static int parse_argv(int argc, char *argv[]) {
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, 'v' },
{}
};
int c;
while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
switch (c) {
case 'h':
printf("%s [OPTIONS...] DEVICE\n\n"
"Video4Linux device identification.\n\n"
" -h --help Show this help text\n"
" --version Show package version\n",
program_invocation_short_name);
return 0;
case 'v':
return version();
case '?':
return -EINVAL;
default:
assert_not_reached();
}
if (!argv[optind])
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"DEVICE argument missing.");
arg_device = argv[optind];
return 1;
}
static int run(int argc, char *argv[]) {
_cleanup_close_ int fd = -EBADF;
struct v4l2_capability v2cap;
int r;
r = parse_argv(argc, argv);
if (r <= 0)
return r;
fd = open(arg_device, O_RDONLY|O_CLOEXEC|O_NOCTTY);
if (fd < 0)
return log_error_errno(errno, "Failed to open %s: %m", arg_device);
if (ioctl(fd, VIDIOC_QUERYCAP, &v2cap) == 0) {
int capabilities;
printf("ID_V4L_VERSION=2\n");
printf("ID_V4L_PRODUCT=%s\n", v2cap.card);
printf("ID_V4L_CAPABILITIES=:");
if (v2cap.capabilities & V4L2_CAP_DEVICE_CAPS)
capabilities = v2cap.device_caps;
else
capabilities = v2cap.capabilities;
if ((capabilities & V4L2_CAP_VIDEO_CAPTURE) > 0 ||
(capabilities & V4L2_CAP_VIDEO_CAPTURE_MPLANE) > 0)
printf("capture:");
if ((capabilities & V4L2_CAP_VIDEO_OUTPUT) > 0 ||
(capabilities & V4L2_CAP_VIDEO_OUTPUT_MPLANE) > 0)
printf("video_output:");
if ((capabilities & V4L2_CAP_VIDEO_OVERLAY) > 0)
printf("video_overlay:");
if ((capabilities & V4L2_CAP_AUDIO) > 0)
printf("audio:");
if ((capabilities & V4L2_CAP_TUNER) > 0)
printf("tuner:");
if ((capabilities & V4L2_CAP_RADIO) > 0)
printf("radio:");
printf("\n");
}
return 0;
}
DEFINE_MAIN_FUNCTION(run);
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