Tvheadend

I'm starting a new thread here because it doesn't really fit in the other. I'm looking at creating a patch to allow for dish network channel services to be read properly.

I've hit a bit of a stumbling block and I need some assistance from the developers since they know the flow much better then I do.

The issue is that DN does not use a standard SDT table - theirs is customized to some degree. A sample of their sdt is here: http://pastebin.com/kCQCUYVt

I have tracked the issue to the dvb_tables.c file. When the muxes are being scanned for services, it is not processing the sdt table the second and subsequent times where it would pick up the channel names, etc. When the following code is called, it is not going to dvb_sdt_callback from what I can tell (it does with other sats, so that is why I believe the issue is here).
tdt_add(tdmi, fp, dvb_sdt_callback, NULL, "sdt",
TDT_QUICKREQ | TDT_CRC, 0x11, NULL);

I can't figure out why its not calling the routine. It's going to tdt_add, but just not to dvb_sdt_callback, where it would populate the other details for the service.

1) Am I on the right track? I can't find anywhere else where it calls dvb_sdt_callback.
2) What are the conditions that could be stopping it from calling that routine?

Thanks for any help.

Cub