You will not be able to plug your Head unit directly into your laptop.
For the USB input, you should be able to use a 2.5 in HDD / CF card that you can also plug into your computer. (I doubt a DVD player will work as it needs commands from the USB Host)
Other options depends on your head unit..
I have a panasonic unit and I can play anything via the Cd changer in (with the addition of a $20 dongle)



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