[linux-dvb] Re: Types and capabilites for HDTV ATSC.

[Holger Waechtler <holger@qanu.de>]

Johannes Stezenbach wrote:
> Holger Waechtler wrote:
>
> > struct dvb_atsc_parameters {
> > 	fe_modulation_t  modulation;
> > 	/* anything more? maybe 8VSB or 16VSB? */
> > };
> >
> >
> > struct dvb_frontend_parameters {
> >        __u32 frequency;
> >        fe_spectral_inversion_t inversion;
> >        union {
> >                struct dvb_qpsk_parameters qpsk;
> >                struct dvb_qam_parameters  qam;
> >                struct dvb_ofdm_parameters ofdm;
> >                struct dvb_atsc_parameters atsc;
> >        } u;
> > };
>
> But you better make sure dvb_atsc_parameters isn't larger
> than any of the other ones; if the size of struct
> dvb_frontend_parameters changes, you'll break binary
> compatibility.
are you sure? It should be safe because the extended struct fields would 
only get accessed it (fe_type == FE_ATSC), not?

(in any case I doubt that the atsc parameter set will get larger than 
the DVB-T monster - ;)

Holger