[linux-dvb] DVB-S2 / Multiproto and future modulation support

Uri Shkolnik urishk at yahoo.com
Thu Sep 11 07:44:56 CEST 2008




--- On Thu, 9/11/08, Andreas Oberritter <obi at linuxtv.org> wrote:

> From: Andreas Oberritter <obi at linuxtv.org>
> Subject: Re: [linux-dvb] DVB-S2 / Multiproto and future modulation support
> To: linux-dvb at linuxtv.org
> Date: Thursday, September 11, 2008, 7:22 AM
> Steven Toth wrote:
> > Christophe Thommeret wrote:
> >> Sounds logical. And that's why Kaffeine search
> for frontend/demux/dvr > 0 and 
> >> uses demux1 with frontend1. (That was just a guess
> since i've never seen 
> >> neither any such devices nor
> comments/recommendations/rules about such case).
> >>
> >> However, all dual tuners devices drivers i know
> expose the 2 frontends as 
> >> frontend0 in separate adapters. But all these
> devices seems to be USB.
> 
> The way I described is used on dual and quad tuner Dreambox
> models.
> 
> >> The fact that Kaffeine works with the experimental
> hvr4000 drier indicates 
> >> that this driver populates frontend1/demux1/dvr1
> and then doesn't follow the 
> >> way you describe (since the tuners can't be
> used at once).
> >> I would like to hear from Steve on this point.
> >>
> >>
> > 
> > Correct, frontend1, demux1, dvr1 etc. All on the same
> adapter. The 
> > driver and multi-frontend patches manage exclusive
> access to the single 
> > internal resource.
> 
> How about dropping demux1 and dvr1 for this adapter, since
> they don't
> create any benefit? IMHO the number of demux devices should
> always equal
> the number of simultaneously usable transport stream
> inputs.
> 
> Regards,
> Andreas
> 
> 
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My input for this -

Some of the hardware devices which using our chipset have two tuners per instance, and should expose 1-2 tuners with 0-2 demux (TS), since not all DTV standard are TS based, and when they are (TS based), it depends when you are using two given tuners together (diversity  mode, same content) or each one is used separately (different frequency and modulation, different content, etc.). 

Those hardware devices can use various bus interfaces - SDIO, USB, SPI, TS, I2C, HIF.....


Uri Shkolnik
Software Architect
Siano Mobile Silicon


      



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