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

Artem Makhutov artem at makhutov.org
Thu Nov 27 13:35:05 CET 2008


On Wed, Nov 26, 2008 at 10:56:05PM +0100, Udo Richter wrote:
> Artem Makhutov wrote:
> > Klaus Schmidinger schrieb:
> >> The attached patch adds a capability flag that allows an application
> >> to determine whether a particular device can handle "second generation
> >> modulation" transponders. 
> > Wouldn't it be better to add something like this:
> > 
> 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.

If I understand you correct you would like to call an function like:

bool ItWorks = DoFakeTune(a lot of Paramters);

Sure, this would work, but it would make the implementation more
difficult for both the driver and the application.

So in this case the application would have to call DoFakeTune() for a lot of
different modulations, FEC's and so on and interprete the results.

The application must then call


This would not make much fun and this could be achieved much easier using some kind of capability flags.

Regards, Artem

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