Watch TV/recorded shows from my Comcast cable box on my Mac?

Watch TV/recorded shows from my Comcast cable box on my Mac?

I've got a MacBook that's about three years old (it's the first generation that had a dual core CPU), running Leopard. I've got a Comcast DVR/HD Cable box. Is there something that I can install in between these devices that will let me watch TV from the Cable box on the Mac's display?