[vdr] dvb-s2 missing modulation values

Luca Olivetti luca at ventoso.org
Sun Oct 3 14:59:53 CEST 2010


Al 03/10/10 14:53, En/na Luca Olivetti ha escrit:
> Hello,
>
> I cannot currently receive dvb-s2 channels, but I'd like to update my
> plugin to work more or less correctly with it (even if I only have a
> couple of users).
> The wikipedia page
>
> http://en.wikipedia.org/wiki/DVB-S2
>
> says that dvb-s2 has 4 possible modulations: QPSK, 8PSK, 16APSK and 32APSK.
>
> Those are defined in s2api, frontend.h, as QPSK, PSK_8, APSK_16 and
> APSK_32.
> There's also a DQPSK, which I suppose is for directv? (see below).
> But in vdr's dvbdevice.c, ModulationValues only maps to strings QPSK,
> PSK_8 and APSK_16.
> APSK_32 and DQPSK are missing.
>
> I read transponder information from ini files downloadable from
>
> http://www.fastsatfinder.com/transponders.html#transponders-sorted
>
> I examined all files there, and for S2 transponders I found these
> definitions:
>
> QPSK (this is easy)
> 8PSK (supposedly maps to PSK_8)
> 16APSK (supposedly maps to APSK_16)
> DIRECTV (supposedly maps to DQPSK)
>
> so maybe APSK_32 isn't really needed?

To complicate matters further, if I try to edit a channel, vdr offers me 
the following modulations: QAM16, QAM32, QAM64, QAM128, QAM256, QPSK, 
8PSK, 16APSK, VSB8, VSB16, QAMAUTO,

QAM modes aren't only for cable? What are VSB for?

Bye
-- 
Luca



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