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sliced-vbi-detect.c

/*
    Sliced vbi autodetection demonstration utility
    Copyright (C) 2004  Hans Verkuil  <hverkuil@xs4all.nl>

    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.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/* This simple utility detects which VBI types are transmitted on
   each field/line. It serves both as example source and as a tool to
   test the sliced VBI implementation.

   Usage: sliced-vbi-detect [device]
   Without a device name as argument it will fallback to /dev/vbi0.
 */

#include <unistd.h>
#include <features.h>         /* Uses _GNU_SOURCE to define getsubopt in stdlib.h */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include <getopt.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <math.h>

#include <linux/videodev2.h>

static void detect(int fh, struct v4l2_sliced_vbi_format *fmt)
{
      struct v4l2_sliced_vbi_data *buf = malloc(fmt->io_size);
      int cnt;

      for (cnt = 0; cnt < 5; cnt++) {
            int size = read(fh, buf, fmt->io_size);
            unsigned i;

            if (size <= 0) {
                  printf("size = %d\n", size);
                  break;
            }
            if (cnt == 0)
                  continue;
            for (i = 0; i < size / sizeof(*buf); i++) {
                  int field, line;

                  line = buf[i].line;
                  field = buf[i].field;
                  if (buf[i].id == 0)
                        continue;
                  if (line < 0 || line >= 24) {
                        printf("line %d out of range\n", line);
                        free(buf);
                        return;
                  }
                  fmt->service_lines[field][line] |= buf[i].id;
            }
      }
      free(buf);
}

static void v2s(int id)
{
      switch (id) {
            case V4L2_SLICED_TELETEXT_B: printf(" TELETEXT"); break;
            case V4L2_SLICED_CAPTION_525: printf(" CC"); break;
            case V4L2_SLICED_WSS_625: printf(" WSS"); break;
            case V4L2_SLICED_VPS: printf(" VPS"); break;
            default: printf(" UNKNOWN %x", id); break;
      }
}

int main(int argc, char **argv)
{
      char *device = "/dev/vbi0";
      struct v4l2_format vbifmt;
      struct v4l2_sliced_vbi_format vbiresult;
      int fh;
      int f, i, b;

      if (argc == 2)
            device = argv[1];
      fh = open(device, O_RDONLY);

      if (fh == -1) {
            fprintf(stderr, "cannot open %s\n", device);
            return 1;
      }
      memset(&vbiresult, 0, sizeof(vbiresult));
      for (i = 0; i < 16; i++) {
            int l;
            int set = 0;

            memset(&vbifmt, 0, sizeof(vbifmt));
            vbifmt.type = V4L2_BUF_TYPE_SLICED_VBI_CAPTURE;
            for (l = 0; l < 24; l++) {
                  vbifmt.fmt.sliced.service_lines[0][l] = 1 << i;
                  vbifmt.fmt.sliced.service_lines[1][l] = 1 << i;
            }
            if (ioctl(fh, VIDIOC_S_FMT, &vbifmt) < 0) {
                  if (errno == EINVAL)
                        continue;
                  perror("IVTV_IOC_S_VBI_FMT");
                  exit(-1);
            }
            vbiresult.io_size = vbifmt.fmt.sliced.io_size;
            for (l = 0; l < 24; l++) {
                  set |= vbifmt.fmt.sliced.service_lines[0][l] |
                         vbifmt.fmt.sliced.service_lines[1][l];
            }
            detect(fh, &vbiresult);
      }
      close(fh);
      for (f = 0; f < 2; f++) {
            printf("Field %d:\n", f);
            for (i = 6; i < 24; i++) {
                  unsigned set = vbiresult.service_lines[f][i];

                  printf("  Line %2d:", i);
                  for (b = 0; b < 16; b++) {
                        if (set & (1 << b))
                              v2s(1 << b);
                  }
                  printf("\n");
            }
      }
      return 0;
}

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