[linux-dvb] Q: dvb api 3 - FE_ATSC

Mws mws at twisted-brains.org
Mon Aug 22 21:05:51 CEST 2005


Rainer.scherg wrote:
> Hi,
> 
> I need some help to understand the ATSC extension of the dvb api.
> looking into the source I have some questions for understanding
> (doc doesn't seems to be up to date):
> 
> 
> 1.) It seems dvb api 3 has been upgraded for ATSC support: FE_ATSC
>  Could we have an ioctl/function call to retrieve current api version
>  or subversion during runtime (checking device pathes is not
>  sufficient). And checking for FE_ATSC: this might only to be set, if
>  there is a proper card/hardware plugged in...
> 
> 
> 2.) As I understand it, FE_ATSC can support VSB_x and QAM_x modulation.
>  Do I have to crosscheck against  FE_CAN_QAM_xxx to distinguish between
>  QAM and VSB? Or is FE_ATSC always VSB_xx modulation?
> 
> 
> 3.) ATSC frequency is basically given in Hz?
>  Does this also apply for satellites? (compared to QSPK (DVB-S) )
>  (--> Integer range!)
> 
> 
> 4.) A question about dvb-api 4.
>  Are there plans to implement a compatibility mode to dvb api 3,
>  so software can be migrated smoothly over time?

there are already incompatibilities, e.g. the section filter structs.
so just recompiling an application will not be the only thing to be done,
when you want to migrate.


regards
marcel





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