#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#include <sys/ioctl.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <unistd.h>

#include <linux/kernel.h>
#include <asm/types.h>
#include <linux/ioctl.h>
#include <linux/videodev2.h>

#include "uvc_compat.h"
    
static int xioctl( int fd, int request, void *arg )
{
  int r;
  
  do r = ioctl (fd, request, arg);
  while (r == -1 && errno == EINTR);
    
  return r;
};


int main( int argc, char *argv[] )
{
  int fd;

  if (argc < 2) return -1;

  // open device
  if ((fd = open (argv[1], O_RDWR)) < 0) {
    fd = 0;
    fprintf (stderr, "open (): %s\n", strerror(errno));
    return -1;
  }    
  
  fcntl (fd, F_SETFD, FD_CLOEXEC);
  
  int index = 0, ret, ret2;
  struct v4l2_frmsizeenum fsize;
  memset (&fsize, 0, sizeof(fsize));
  fsize.pixel_format = V4L2_PIX_FMT_YUV420;
  fsize.index = 0;

  struct v4l2_frmivalenum fival;
  memset (&fival, 0, sizeof(fival));

  do {
  	ret = xioctl (fd, VIDIOC_ENUM_FRAMESIZES, &fsize);
	if (ret == 0 && fsize.type == V4L2_FRMSIZE_TYPE_DISCRETE) {
		printf ("%i: %ix%i: ", fsize.index, fsize.discrete.width, fsize.discrete.height);

		fival.pixel_format = fsize.pixel_format;
		fival.width = fsize.discrete.width;
		fival.height = fsize.discrete.height;
		fival.index = 0;

		do {
			ret2 = xioctl (fd, VIDIOC_ENUM_FRAMEINTERVALS, &fival);
			if (ret2 == 0 && fival.type == V4L2_FRMIVAL_TYPE_DISCRETE) {
				printf ("%u/%u ", fival.discrete.numerator, fival.discrete.denominator);
			}

			fival.index++;
		} while (ret2 == 0);

		printf ("\n");
	}

	fsize.index++;
  } while (ret==0);

  close (fd);

  return 0;
}