[vdr] Re: Channel Switch every 21Seconds with pre5 ??

[Klaus Schmidinger <Klaus.Schmidinger@cadsoft.de>]

Thomas Sailer wrote:
> 
> Klaus Schmidinger wrote:
> 
> > I'd be more than glad to tell you, but I have no idea...
> > If you have any suggestions what I could test, please let me know.
> 
> How much SNR do you have? The ARM seems to crash frequently if
> there are uncorrected bit errors in the transport stream, or if there
> are wrongly formatted tables in the TS.

I've added an ioctl() call to cDvbApi::SetChannel() to quickly dump the SNR
into the log file, but it looks as if the values returned by the FE_READ_SNR
call need a while until they are stable. So I've added a loop that tries
again until the value is stable enough:

  int32_t Snr = -1;
  for (int i = 0; i < 10; i++) {
      int32_t snr = -1;
      if (ioctl(fd_frontend, FE_READ_SNR, &snr) < 0) {
         LOG_ERROR;
         break;
         }
      dsyslog(LOG_INFO, "%d snr = %.1f", i, double(snr) / 1000000);
      if (snr >= 0) {
         if (Snr > 0) {
            if (abs(Snr - snr) < 500000)
               break;
            }
         Snr = snr;
         }
      }

With this I get SNR values in the range 11.1 ... 17.1

Klaus
-- 
_______________________________________________________________

Klaus Schmidinger                       Phone: +49-8635-6989-10
CadSoft Computer GmbH                   Fax:   +49-8635-6989-40
Hofmark 2                               Email:   kls@cadsoft.de
D-84568 Pleiskirchen, Germany           URL:     www.cadsoft.de
_______________________________________________________________