[vdr] the tuning threads

Jeremy Hall jhall at maoz.com
Mon Dec 12 15:18:03 CET 2005


Hello,

My apologies if I seem a bit dense here, but there have been a few threads 
either on vdr or linux-dvb that have my attention--yet I am having a 
little difficulty putting it all together.

There is a thread about fixing for 8vsb tuning that has a patch which sets 
some #defines for (I think) how long you think it will take to tune a 
channel on your system, but I'm not sure I understand what it's trying to 
resolve.

my situation:

I have a rotor connected to a diseqc switch connected to a skystar budget 
that uses stv0299 as its frontend, but overrides voltage and possibly 
other routines with flexcop_set_* (like flexcop_set_voltage) etc

When I'm trying to align the dish, what is the best recommended way to 
proceed? I remember reading some thread about new tuning modes getting 
checked into the linuxtv-dvb dvb-kernel CVS (now probably v4l-kernel) but 
it's quite hard to align a dish now.

What are the requirements for setting voltage, tone, and other fe events 
from plugins? Older vdr versions seemed to authorize plugins to do this, 
but now newer ones seem to want the sets to occur from within the vdr 
loop, so you have to modify the vdr core code to allow a plugin to trigger 
events from within the main loop (is this thread-safe)

So can somebody take a moment please and describe what happens to vdr in 
the tuning thread? What states can it be in and what is it trying to do? I 
know some on this list would suggest I read through the source, which I am 
capable of doing, but I'm asking somebody who is fluent in this to just 
take about five minutes to write up a pseudocode explanation just to make 
sure we're all on the same page.  I think if we had a brief description in 
one message describing bullet points for what everybody's trying to solve 
efficiency would improve.

NOTE: it takes about 25 seconds to zoom across the sky, so whatever code 
gets written should understand that.

Thanks in advance

_J



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