[linux-dvb] DVB-S2 / Multiproto and future modulation support
stoth at linuxtv.org
Wed Sep 10 20:39:33 CEST 2008
Janne Grunau wrote:
> On Wednesday 10 September 2008 17:10:19 Christophe Thommeret wrote:
>> Le Wednesday 10 September 2008 15:38:23 Steven Toth, vous avez écrit :
>>>> Is this card able to deliver both S and T at the same time?
>>> No, the hardware can do S/S2 or T.
>>> The driver in the S2API tree only has S/S2 enabled (for the time
>> So, maybe we have to think a bit about how to add support for this
>> kind of device.
>> Maybe a solution could be to have :
>> - adapter0/frontend0 -> S/S2 tuner
>> - adapter0/frontend1 -> T tuner
>> So applications could know that these 2 frontends are exclusive.
>> That would not require any API change, but would have to be a rule
>> followed by all drivers.
> The experimental HVR4000 does this already and we have at least initial
> support for that in mythtv.
Yes, I believe it was added sometime ago.
> I don't think this was the intended use of multiple frontends in the DVB
> API but AFAIK all dual tuners drivers uses multiple adapters.
It actually was intended for use, it came from patches based on
linuxtv.org/hg/~stoth/hvr3000 2 years ago, for this exact reason.
The idea died on the vine, except for a few die-hard people to
maintained their own spin-off/derivative.
> I like this approach.
So do I, it solves a lot of problems with multiple frontends on a single
transport bus. At the time I did not patch the 7134 framework with the
minor changes for it to comply, but if that's done then the 6-in-1 7134
Dual DVB-S/T/Analog card would also benefit greatly. Right now that card
only supports some functions in the kernel (IIRC).
It's been a very long time but this was also mentioned on the mailing list.
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