root/src/udev/v4l_id/v4l_id.c

DEFINITIONS

1. main

/*
 * Copyright (C) 2009 Kay Sievers <kay@vrfy.org>
 * Copyright (c) 2009 Filippo Argiolas <filippo.argiolas@gmail.com>
 *
 * 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:
 */

#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <getopt.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <linux/videodev2.h>

int main (int argc, char *argv[])
{
        static const struct option options[] = {
                { "help", no_argument, NULL, 'h' },
                {}
        };
        int fd;
        char *device;
        struct v4l2_capability v2cap;

        while (1) {
                int option;

                option = getopt_long(argc, argv, "h", options, NULL);
                if (option == -1)
                        break;

                switch (option) {
                case 'h':
                        printf("Usage: v4l_id [--help] <device file>\n\n");
                        return 0;
                default:
                        return 1;
                }
        }
        device = argv[optind];

        if (device == NULL)
                return 2;
        fd = open (device, O_RDONLY);
        if (fd < 0)
                return 3;

        if (ioctl (fd, VIDIOC_QUERYCAP, &v2cap) == 0) {
                printf("ID_V4L_VERSION=2\n");
                printf("ID_V4L_PRODUCT=%s\n", v2cap.card);
                printf("ID_V4L_CAPABILITIES=:");
                if ((v2cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) > 0)
                        printf("capture:");
                if ((v2cap.capabilities & V4L2_CAP_VIDEO_OUTPUT) > 0)
                        printf("video_output:");
                if ((v2cap.capabilities & V4L2_CAP_VIDEO_OVERLAY) > 0)
                        printf("video_overlay:");
                if ((v2cap.capabilities & V4L2_CAP_AUDIO) > 0)
                        printf("audio:");
                if ((v2cap.capabilities & V4L2_CAP_TUNER) > 0)
                        printf("tuner:");
                if ((v2cap.capabilities & V4L2_CAP_RADIO) > 0)
                        printf("radio:");
                printf("\n");
        }

        close (fd);
        return 0;
}