The problem with that is how do I even get the API for the specific driver of a tuner card. surely these tv-card makers will not make their drivers open source.
man that sucks, i know that there is a open source WDM driver for Bt848 / Bt849 / Bt878 & Bt879 Chipset tv-tuner cards for windows. link is below
http://btwincap.sourceforge.net/
is there one for saa6588 chip?