[linux-dvb] Re: Tuning with driver 2001-05-28

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

Johannes Stezenbach wrote:
> 
> Ralph Metzler wrote:
> >
> > Well, such a "close" function is already available. It is called "close()".
> > Closing the file will always close the filter ...
> 
> Not true. The filter remains set in the demux hardware, or else
> you could not watch TV with xawtv after quitting e.g. ntuxzap.
> 
> IIRC the firmware has allocated fixed filters for video, audio
> and teletext, and complains when someone tries to set e.g. an
> audio filter with the same PID as set in the video filter.
> 
> At the time we discussed this, the firmware had no knowledge of
> whether a filter is regularly open, or just still open because
> of pids_off=0, and thus could not act accordingly.
> 
> Has this changed?
> 
> > I could change the behavior of the filters so that they already free their
> > resources when they are stopped. (Several people already proposed this to
> > me). his would only brake applications which rely on filters being
> > available once they were opened. If I change the driver as described
> > above it could happen that an open but stopped filter cannot be
> > started again but if you prefer it this way I'll do it.
> 
> If you ask me: Don't change anything.

Well, I can't do any tests right now since my VDR box is "occupied",
but from what I read in this thread I would assume that the best thing
to do before setting the PIDs to new values would be to set all of
them to 0x1FFF first (or would 0x0000 be the right value to set "no PID"?),
and then set them to their new values. That way there could never be the 
case that the two main PIDs (video and audio) happen to get the same value.

Ralph, what do you think? Would this help?

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
_______________________________________________________________


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