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driver-test.c

/*
   driver-test.c - This program tests V4L2 kernel drivers

   Copyright (C) 2006 Mauro Carvalho Chehab <mchehab@infradead.org>

   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 "../../utils/libv4l2util/v4l2_driver.h"
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>

static int recebe_buffer (struct v4l2_buffer *v4l2_buf, struct v4l2_t_buf *buf)
{

      return 0;
}

int main(void)
{
      struct v4l2_driver drv;
      struct drv_list *cur;
      unsigned int count = 10, i;
      double freq;

      if (v4l2_open ("/dev/video0", 1,&drv)<0) {
            perror("open /dev/video0");
            return -1;
      }
      if (v4l2_enum_stds (&drv)<0) {
            perror("enum_stds");
            printf("Error! Driver is not reporting supported STD, frames/sec and number of lines!\n Trying to continue anyway...\n");
      } else {
            /* Tries all video standards */
            for (cur=drv.stds;cur!=NULL;cur=cur->next) {
                  v4l2_std_id id=((struct v4l2_standard *)cur->curr)->id;
                  if (cur->curr)
                        if (v4l2_setget_std (&drv, V4L2_SET_GET, &id))
                              perror("set_std");
            }
      }

      if (v4l2_enum_input (&drv)<0) {
            perror("enum_input");
      }

      /* Tries all video inputs */
      for (cur=drv.inputs;cur!=NULL;cur=cur->next) {
            struct v4l2_input input;
            input.index=((struct v4l2_input* )cur->curr)->index;
            if (cur->curr)
                  if (v4l2_setget_input (&drv, V4L2_SET_GET, &input))
                        perror("set_input");
      }

      if (v4l2_enum_fmt (&drv,V4L2_BUF_TYPE_VIDEO_CAPTURE)<0) {
            perror("enum_fmt_cap");
      }

      /* Tries all formats */
      for (cur=drv.fmt_caps;cur!=NULL;cur=cur->next) {
            struct v4l2_format fmt;
            memset (&fmt,0,sizeof(fmt));

            uint32_t       pixelformat=((struct v4l2_fmtdesc *)cur->curr)->pixelformat;
            if (cur->curr) {
                  if (v4l2_gettryset_fmt_cap (&drv,V4L2_SET,&fmt, 640, 480,
                                    pixelformat,V4L2_FIELD_ANY))
                        perror("set_input");
            }
      }

      if (v4l2_get_parm (&drv)<0) {
            perror("get_parm");
      }


      v4l2_getset_freq (&drv,V4L2_GET, &freq);

      freq=0;
      v4l2_getset_freq (&drv,V4L2_SET, &freq);

      freq=121250000; /* 121.250 MHz */
      v4l2_getset_freq (&drv,V4L2_SET, &freq);

      printf("Preparing for frames...\n");
      fflush (stdout);
      sleep(1);

      v4l2_mmap_bufs(&drv, 2);

      v4l2_start_streaming(&drv);

      printf("Waiting for frames...\n");

      for (i=0;i<count;i++) {
            fd_set fds;
            struct timeval tv;
            int r;

            FD_ZERO (&fds);
            FD_SET (drv.fd, &fds);

            /* Timeout. */
            tv.tv_sec = 2;
            tv.tv_usec = 0;

            r = select (drv.fd + 1, &fds, NULL, NULL, &tv);
            if (-1 == r) {
                  if (EINTR == errno)
                        continue;

                  perror ("select");
                  return errno;
            }

            if (0 == r) {
                  fprintf (stderr, "select timeout\n");
                  return errno;
            }

            if (v4l2_rcvbuf(&drv, recebe_buffer))
                  break;
      }

      printf("stopping streaming\n");
      v4l2_stop_streaming(&drv);

      if (v4l2_close (&drv)<0) {
            perror("close");
            return -1;
      }
      return 0;
}

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