[linux-dvb] Re: How to check signal after szap?

["Jiri Netopil" <jiri.netopil@mediumsoft.cz>]

Emard, thank your to your reply. But your patch seems not to be useful for
me since it does not exit the szap running with -r option (as you wrote in
december), which is my case.

I think I already found the solution usable in scripts without modding the
szap:

#!/bin/bash
szap -r ZDF &                      #szap has to be running in the background
$timelimit=5
read -t $timelimit signal < /dev/dvb/adapter0/dvr0
if [ -z "$signal" ]
then
  echo "No signal!"
else
  echo "Signal found!"
fi

Signal is considered having some data in /dev/dvb/adapter0/dvr0. When read
finds some data in /dev/dvb/adapter0/dvr0, script continues immediately.
When read cannot finds data, it tries it again for the specified timelimit.
Then it continues. It works great!

----- Puvodní zpráva -----
Od: <emard@softhome.net>
Komu: "Jiri Netopil" <jiri.netopil@local.mediumsoft.cz>
Kopie: <linux-dvb@linuxtv.org>
Odesláno: 12. února 2003 11:01
Predmet: [linux-dvb] Re: How to check signal after szap?


> Jiri Netopil writes:
>
> > I am making a bash script for tunning DVB Nova card. I am using szap for
> > tunning and I would like to check if there is signal after szaping to
> > desired channel (because I would like to tune to the previous used
channel
> > when there is no signal). Of course it can be recognised from the szap
> > output to screen (FE_HAS _LOCK or somehow like this), but it cannot be
> > tested in script. I have been trying several things such as redirect the
> > output from szap to file, to check the data in /dev/dvb/adapter0/dvr0
and so
> > on, but without any success. I am new in Linux and I already tried all
my
> > few ideas.
> >
> > Does anyone have any idea here?
>
> I do. szap has to be patched a bit in order that it returns
> after successful tuning. I posted a patch but it should be
> a bit more intelligent (it should check for 5-6 ber=0 in
> succession instead of just one).
>
> After szap exits, FE will remain active for 3 seconds
> so there can follow some short dvr read, e.g. alevt-date
> or similar call with the card still active during this
> 3 seconds.
>
> Emard
>
>
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