[linux-dvb] Re: C/A routing Question

[Johannes Stezenbach <js@convergence.de>]

Rob.McConnell@Zarlink.Com wrote:
> 
> I've looked at the Demux API and had a quick look at the C/A but I don't
> see an apparent way in which to route a TS from a different source other
> that from the front-end to a C/A device.  What I want to be able to do is
> route a TS from different front-ends and also a HDD to the C/A and then
> back in to the Demux.  This would require a router on the input side to the
> C/A.
> 
> Do we currently support this? If not, then would it make sense to put this
> routing in the C/A device or the Demux?

Well, the demux API certainly has a weak spot here. We've been
discussing this off-list, but it's not yet clear how to clean
it up without breaking all applications _again_.

The Metzlers introduced DMX_SET_SOURCE, but it has no well-defined
semantics yet, and is even unimplemented for current drivers.

IMHO it is supposed to switch the input of the whole demux from
frontend to dvr device. (This somehow makes the input field of
struct dmx_pes_filter_params redundant.)
The stream you feed to the dvr device is then routed through the CA
device which is implicitely connected to the demux.
(Hardware: ECDs are usually embedded inthe demux, so you aren't free to route
streams through them at will. CIs are usually connected between frontend
and demux, so you usually cannot pass a stream from the HDD through CI.
Or am I wrong?)

We talked to some Toshiba guys recently, and they would prefer
to have stream routing generally be done at the sink, i.e.
drop the DMX_OUT_DECODER thing and add VIDEO_SET_SOURCE,
AUDIO_SET_SOURCE etc.

I feel there's a need for a broader discussion here.


Best Regards,
Johannes


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