[linux-dvb] [PATCH] Add missing S2 caps flag to S2API

Alex Betis alex.betis at gmail.com
Thu Nov 27 08:13:13 CET 2008


On Wed, Nov 26, 2008 at 11:56 PM, Udo Richter <udo_richter at gmx.de> wrote:

> Without knowing enough about the differences between -S and -S2 tuners
> and whatever cards are on the market, I'll try to step back and give
> this my 2c point of view:
>
> What does a DVB app need to know? A DVB app probably just needs to know
> "What devices are capable of tuning to channel XYZ?". The API could
> answer this the same way as it would tune to channel XYZ, just without
> actually doing it. Try-before-you-buy.
>
> This would also give maximum flexibility to the driver, as a device that
> supports some -S2 features could offer these, or a device that has known
> bugs on some tuning modes could also deny these. Non-standard modes
> could be offered without requiring yet another FE_CAN_XYZ.

Assuming you have 3 cards, one DVB-S2 and 2xDVB-S.
In case of DVB-S channel, all the cards will be able to record it, what will
be the decision? Random?
You might select DVB-S2 card for DVB-S recording, while it might be used to
record DVB-S2 channel that no other card is capable to do.

I agree that driver should tell whenever it able to tune to a channel when
its ordered to perform tuning. There shouldn't be any guess just by checking
the LOCK status.
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