[linux-dvb] a strange EIT Section

Patrick Boettcher patrick.boettcher at desy.de
Tue Jun 21 14:10:43 CEST 2005


On Tue, 21 Jun 2005, Felix Domke wrote:

> Patrick Boettcher wrote:
>>> So the section should IMHO never appeared into userspace. Sure it's
>>> right to be prepared for invalid sections (and drop them), but in this
>>> case, I suspect a driver/hardware bug.
>>> Does the hardware use hardware section filtering?
>> No, this section was received using a budget Card (AirStar2). Parsing
>> was done by the linux dvb demuxer.
>> I received a lot of valid (parsable) sections before. This faulty
>> section (and others) I got, when the signal went through a normal
>> loss/regain process.
> Of course there's always the 1:16 possibility to skip a multiple of 16
> packets on that pid, so the CC will give a failse match.

I see.

> Does it happen all the time after a signal regain or only very few times?

No. It happens rarely, but I can force it, by "playing around" with the 
antenna.

What would be your suggestion? A harder syntax check in the program 
(correct table_id for this PID, section_syntax_indicator == 1) or 
anything else?

Patrick.

--
   Mail: patrick.boettcher at desy.de
   WWW:  http://www.wi-bw.tfh-wildau.de/~pboettch/




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