[LAU] Surround Sound

[Mac]

I'm looking around for a way to get surround sound into a PC and be
able to route it with JACK.

So there are two parts:

- What physical connection is needed on the PC (i.e. I have a blue ray
player or cable box spewing surround sound...maybe hdmi?) Any body
have experiences with particular interface cards?

- What software goes between the hardware above and JACK?

Ideas? Comments? Recommendations?

Thanks,
Mac