Hello
I got a BCM70015 card working with vdr-xineliboutput by using the crystalhd plugin for xine here :
http://crystalhd.svn.sourceforge.net/viewvc/crystalhd/branches/xine-plugin-c...
The install procedure is thoroughly explained in the README.
Keep in mind you should compile it towards xine-lib 1.2, which is out since a few days.
It works reliably with h.264 dvb-t streams on my D945GSEJT motherboard with not more than 30% CPU usage. The media player also works, even if it gets somewhat unresponsive when you try to fast forward or rewind some HD files.
I don't know if the vaapi driver for crystalhd is usable too.