src/udev/v4l_id/v4l_id.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /*
   4  * Copyright (C) 2009 Kay Sievers <kay@vrfy.org>
   5  * Copyright (c) 2009 Filippo Argiolas <filippo.argiolas@gmail.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details:
  16  */
  17
  18 #include <ctype.h>
  19 #include <errno.h>
  20 #include <fcntl.h>
  21 #include <getopt.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <sys/ioctl.h>
  26 #include <sys/time.h>
  27 #include <sys/types.h>
  28 #include <unistd.h>
  29 #include <linux/videodev2.h>
  30
  31 #include "fd-util.h"
  32 #include "util.h"
  33
  34 int main(int argc, char *argv[]) {
  35         static const struct option options[] = {
  36                 { "help", no_argument, NULL, 'h' },
  37                 {}
  38         };
  39         _cleanup_close_ int fd = -1;
  40         char *device;
  41         struct v4l2_capability v2cap;
  42         int c;
  43
  44         while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
  45
  46                 switch (c) {
  47                 case 'h':
  48                         printf("%s [-h,--help] <device file>\n\n"
  49                                "Video4Linux device identification.\n\n"
  50                                "  -h  Print this message\n"
  51                                , program_invocation_short_name);
  52                         return 0;
  53                 case '?':
  54                         return -EINVAL;
  55
  56                 default:
  57                         assert_not_reached("Unhandled option");
  58                 }
  59
  60         device = argv[optind];
  61         if (device == NULL)
  62                 return 2;
  63
  64         fd = open(device, O_RDONLY);
  65         if (fd < 0)
  66                 return 3;
  67
  68         if (ioctl(fd, VIDIOC_QUERYCAP, &v2cap) == 0) {
  69                 printf("ID_V4L_VERSION=2\n");
  70                 printf("ID_V4L_PRODUCT=%s\n", v2cap.card);
  71                 printf("ID_V4L_CAPABILITIES=:");
  72                 if ((v2cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) > 0)
  73                         printf("capture:");
  74                 if ((v2cap.capabilities & V4L2_CAP_VIDEO_OUTPUT) > 0)
  75                         printf("video_output:");
  76                 if ((v2cap.capabilities & V4L2_CAP_VIDEO_OVERLAY) > 0)
  77                         printf("video_overlay:");
  78                 if ((v2cap.capabilities & V4L2_CAP_AUDIO) > 0)
  79                         printf("audio:");
  80                 if ((v2cap.capabilities & V4L2_CAP_TUNER) > 0)
  81                         printf("tuner:");
  82                 if ((v2cap.capabilities & V4L2_CAP_RADIO) > 0)
  83                         printf("radio:");
  84                 printf("\n");
  85         }
  86
  87         return 0;
  88 }