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

[Johannes Stezenbach <js@convergence.de>]

On Tue, Feb 25, 2003 at 01:50:41PM +0000, Rob.McConnell@Zarlink.Com wrote:
> 
> I was also having a look at the filter specs and I think we should have
> more flexibility for setting other criteria such as the following:
> 
>       1) Whether to allow full TS packet or just payload through.

That's the funtionality of the current PES filter (DMX_OUT_TAP)
(which doesn't guarantee packet alignment for read() calls).

>       2) Whether to allow duplicate TS packets or to discard them.
>       3) Whether to allow or discard TS packets with error flag set.

That's rather special purpose, but worth supporting.

>       4) Whether to match TS packets with the payload unit start indicator
> set (after which all packets would be matched).

That's too easy to do in userspace (or, in the future, in the DMA-to-hdd
handler). Just throw away the first few TS packets.

>       5) Whether to match on TS packet priorities.

What's that? Or, rather, what is the transport_priority field
used for in real-life applications?

>       6) Whether to allow/disallow TS packets with adaptation field
> through.

That's maybe worth supporting.

> I suppose we could add these options to the "flag" field in the filter
> structs if we wanted to or just have some other IOCTLs to setup the policy.
> What do you think?

IMHO a "flags" field in (the now mis-named) struct dmx_pes_filter_params
would be fine.


Regards,
Johannes


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