[MPlayer-users] Problem changing channel with DVB + Solution

[Oliver Rauch]

Hello.

When I changed the DVB-T channel mplayer was not able to read the stream
and exited in 9 of 10 cases.

mplayer: MPlayer 1.0pre3try2-3.2.2
DVB-T: Hauppauge WINTV Nova-T (DVB-T) (PCI card based on Technotrend)

Reason: FE_LOCK is not always stable when the channel just has been
changed.

Solution:
- make sure FE_LOCK is stable for more than one request (e.g. 3-10)
- to keep channel changing time constant: reduce poll timeout

in libmpdemux/dvb_tune.c, function: check_status(...) for HAVE_DVB_HEAD:

I hope it is usefull.

Best regards
Oliver


suggested code:
 int lock_count = 0;

....

 event.status=0;
/* TEST CONDITION CHANGED */
 while (((event.status & FE_TIMEDOUT)==0) && (lock_count < 6)) 
 {
   mp_msg(MSGT_DEMUX, MSGL_V, "polling....\n");
   if (poll(pfd,1,500)) /* TIMEOUT CHANGED */
   {
     if (pfd[0].revents & POLLIN)
     {
       mp_msg(MSGT_DEMUX, MSGL_V, "Getting frontend event\n");
       if ( ioctl(fd_frontend, FE_GET_EVENT, &event) < 0)
       {
         mp_msg(MSGT_DEMUX, MSGL_ERR, "FE_GET_EVENT");
         return -1;
       }
     }
     print_status(event.status);
   }
/* NEW */
   if (event.status & FE_HAS_LOCK)
   {
     lock_count ++;
   }
   else
   {
     lock_count = 0;
   }
 }