Re: DVB-SI and DVB-Text

[David Toth <dave@IRIS.geobio.elte.hu>]

 Hi!

On Thu, 17 Aug 2000 Robert.Schneider@lotus.com wrote:

> I would like to implement showing the running and next program in VDR.
>[...]
> Could someone point me in the right direction on how to tell the driver to 
> forward those packages to me?

 Here is my implementation for your request (it was written in 10 mins, so
be indulgent). The code sets up a bitfilter for actual TS EIT
present/following, and dumps to the stdout any data received (so a lot of
stuff missing, e.g. CRC check, section format check, etc...) If you want
to "decode" the EIT table, I recommend you to get EN 300 468 at ETSI. To
compile the source, make sure you use -I to extend include search path
with your DVB/driver source (where dvb_v4l.h is).. before you start it
tune in a channel.
 Bye,
 David

---- sample source begins here --------

/* make sure to compile the source with -I/where/you/have/the/DVB/driver
 */

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/poll.h>
#include "dvb_v4l.h"
#include "dvb_comcode.h"

void main()
{
  unsigned char bitfilter_dev[]="/dev/vbi";
  struct bitfilter BitFilter;
  struct pollfd pfd;
  int fsi,cnt,seclen;
  int filter_handle=0;
  unsigned char filterruns;
  unsigned char buf[65536]; /* data buffer */

  /* open DVB bitfilter device - /dev/vbi (or /dev/video is good too) */

  if((fsi=open(bitfilter_dev, O_RDWR))<0)
  {
    fprintf(stderr,"Failed to open DVB bitfilter device: '%s'\n",
            bitfilter_dev);
    fprintf(stderr,"Error is"); perror(" ");
    return;
  }

  /* setup bitfilter for actual TS, EIT present/following, for continouous
   * mode
   */
  /* fill bitfilter struct */
  BitFilter.pid=0x0012; /* EIT_PID */
  for(cnt=0;cnt<16;cnt++) BitFilter.data[cnt]=0; /* erase filter data */
  BitFilter.data[0]=0x4EFF; /* set filter first byte - table_id 0x4E */
  BitFilter.mode=SECTION_CONTINUOS;
  BitFilter.handle=filter_handle;
  BitFilter.flags=FILTER_MEM;
  /* setup bitfilter */
  if(ioctl(fsi, VIDIOCSBITFILTER, &BitFilter)<0)
  {
    fprintf(stderr,"ioctl VIDIOCSBITFILTER failed\n");
    fprintf(stderr,"Error is"); perror(" ");
    close(fsi); return;
  }

  filterruns=1;
  while(filterruns)
  {
    /* wait data become ready from the bitfilter */
    pfd.fd=fsi;
    pfd.events=POLLIN;
    if(poll(&pfd,1,5000000)!=0) /* timeout is 5 secs */
    {
      /* read section */
      read(fsi, buf, 8);
      seclen=(buf[6]<<8)|buf[7];
      read(fsi, buf, seclen);

      /* EIT table is in buf... here you have to process the table */
      /* for now just dump it to the stdout */
      seclen=((buf[1]&0x0f)<<8)|buf[2];
      for(cnt=0;cnt<seclen;cnt++)
        /* print chars only between 32-127 */
        printf("%c",buf[cnt]<32?'.':buf[cnt]>=127?'.':buf[cnt]);
      printf("\n");
      fflush(stdout);
    }
    else filterruns=0;
  }

  /* shutdown filter */
  if(ioctl(fsi, VIDIOCSSHUTDOWNFILTER, &filter_handle)<0)
  {
     fprintf(stderr,"ioctl VIDIOCSSHUTDOWNFILTER failed!\n");
     fprintf(stderr,"Error is"); perror(" ");
  }
  close(fsi);
};

---- sample source ends here --------