[vdr] Re: Some questions about plugin-features of vdr-developer...

[Christian Schuld <chris@sonnengesicht.de>]

Hi,

On Tuesday 03 September 2002 09:13, you wrote:
> Reiner Rosin wrote:
[..]
> I don't think that DiSEqC is something that should be handled by a plugin.
> My plans are to replace the 'diseqc' parameter in the channels.conf file
> with a more general 'source' parameter. In case of a satellite channel,
> this would be the satellite position. Then a yet to be written function
> cDvbDevice::SetDiSEqC() shall take the satellite position, frequency and
> polarization and generate the necessary DiSEqC commands to set the
> equipment to receive this channel. In doing so, it shall read a yet to be
> specified file 'diseqc.conf', which maps the satellite position, frequency
> and polarization to the installation specific DiSEqC setup.
>
> Of course this needs to go into the core cDvbDevice implementation.
> If you can come up with a useful implementation of a
> cDvbDevice::SetDiSEqC(), please let me know.

Please keep in mind that you can have DiSEqC setups with e.g. cascading 
switches or rotors etc, which have to be considered when designing 
cDvbDevice::SetDiSEqc().

Lets take my setup as an example. I have a "Stab" sat rotor on position 2 of a 
DiSEqC 4/1 switch and a second dish pointing to Astra on switch position 1. 
So if I want to move the rotor, I have to send a diseqc-cmd to the switch (to 
select pos.2) first and then send the appropriate diseqc-cmd to the rotor.

A problem with rotors generally is, that they need quite a few seconds to 
reach a new position. My rotor moves at a speed of 1,8°/s, so it takes f.e. 
about 43 seconds to move from 42°W to 36°E. cDvbDevice::SetDiSEqc() have to 
be able to retune the channel, because on the move the frontend might lock to 
a wrong satellite or loose the frequency because of the zigzag- scan. 

Another problem with my rotor is, that it only moves when tuned to horizontal 
channels, so when it gets 18V. But I don't know if this is a limitation of 
the DVBs or my special setup.

The EPG handling needs to be adjusted, too, when using multiple satellites, 
because then you don't have unique ServiceId any more.

Christian