[linux-dvb] Q: dvb api 3 - FE_ATSC
Rainer.Scherg at t-online.de
Mon Aug 22 21:01:05 CEST 2005
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?
Tnx for help
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