src/extras/v4l_id/v4l_id.c

   1 /*
   2  * Copyright (C) 2009 Kay Sievers <kay.sievers@vrfy.org>
   3  * Copyright (c) 2009 Filippo Argiolas <filippo.argiolas@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation; either version 2 of the
   8  * License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details:
  14  */
  15
  16 #include <stdio.h>
  17 #include <errno.h>
  18 #include <string.h>
  19 #include <ctype.h>
  20 #include <stdlib.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <unistd.h>
  25 #include <errno.h>
  26 #include <fcntl.h>
  27 #include <getopt.h>
  28 #include <sys/types.h>
  29 #include <sys/time.h>
  30 #include <sys/ioctl.h>
  31 #include <linux/videodev2.h>
  32
  33 int main (int argc, char *argv[])
  34 {
  35         static const struct option options[] = {
  36                 { "help", no_argument, NULL, 'h' },
  37                 {}
  38         };
  39         int fd;
  40         char *device;
  41         struct v4l2_capability v2cap;
  42
  43         while (1) {
  44                 int option;
  45
  46                 option = getopt_long(argc, argv, "h", options, NULL);
  47                 if (option == -1)
  48                         break;
  49
  50                 switch (option) {
  51                 case 'h':
  52                         printf("Usage: v4l_id [--help] <device file>\n\n");
  53                         return 0;
  54                 default:
  55                         return 1;
  56                 }
  57         }
  58         device = argv[optind];
  59
  60         if (device == NULL)
  61                 return 2;
  62         fd = open (device, O_RDONLY);
  63         if (fd < 0)
  64                 return 3;
  65
  66         if (ioctl (fd, VIDIOC_QUERYCAP, &v2cap) == 0) {
  67                 printf("ID_V4L_VERSION=2\n");
  68                 printf("ID_V4L_PRODUCT=%s\n", v2cap.card);
  69                 printf("ID_V4L_CAPABILITIES=:");
  70                 if ((v2cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) > 0)
  71                         printf("capture:");
  72                 if ((v2cap.capabilities & V4L2_CAP_VIDEO_OUTPUT) > 0)
  73                         printf("video_output:");
  74                 if ((v2cap.capabilities & V4L2_CAP_VIDEO_OVERLAY) > 0)
  75                         printf("video_overlay:");
  76                 if ((v2cap.capabilities & V4L2_CAP_AUDIO) > 0)
  77                         printf("audio:");
  78                 if ((v2cap.capabilities & V4L2_CAP_TUNER) > 0)
  79                         printf("tuner:");
  80                 if ((v2cap.capabilities & V4L2_CAP_RADIO) > 0)
  81                         printf("radio:");
  82                 printf("\n");
  83         }
  84
  85         close (fd);
  86         return 0;
  87 }