[linux-dvb] Re: Linux DVB API 4 Q's

[Rob.McConnell@Zarlink.Com]

Hi Again,



> > > That would be one possible way.
> > > Btw., I have a question regarding the new CI devices and how to
differentiate
> > > several CI adapters (not that I know receivers with more than one).
> > > If you have one CI device for each slot, you might want to call
> > > them ci0_0, ci0_1, ci1_1 etc. where the first number is the CI
adapter
> > > unit and the second the slot. Your source setting calls to ciN_0
would
> > > be valid for all ciN_X and so on.
> >
> > I have no problems with the adapter/slot method. Any more
> > comments/suggestions folks?

> The one device per slot thing is IMHO nicer to use, provided that
> you have a static assignment between frontend, CI and demux.

One CI device per slot would be fine for our requirements.  I guess if you
had 2 slots and only one physical CI device you could always create another
logical CI device to handle the extra slot.  Was this your thinking as
well?

Having a fixed routing from front-end to C/I device through to the CAM and
back through to the demux is not a problem as long as there is an ioctl to
set the TS source of the C/I device.  The demux can then choose the source
from either a normal front-end(s) or the output from the CAM using the
DVB_DMX_SET_SOURCE ioctl.  Is this OK, can we add this ioctl to ci.h?

> If you can dynamically configure your stream routing there's
> a difference between 1 CI controller with 2 slots and 2 CI
> controllers with 1 slot each, because in the first case both
> slots can only decode the same stream.

> Tell me if you think it is necessary to reintroduce the
> slot-number into ci.h and map a two-slot CI controller to
> a single device with two slots. I don't care much, I just thought
> the current ci.h is simpler than the old ca.h, and thus better ;-)

Keeping it simple is with 1 CI device per slot sounds good.

BTW, I guess it's no use to have an API between a smart-card and a host as
this will be confidential info. Right?

Rob : )






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