You could buy a composite to 3.5mm adapter and plug the headphones directly into the TV.
The port on the controller is only for voice chat, no game sounds come through that. --- http://bfbc2.statsverse.com/sig/detail6/360/DividerByZero.png Ohaithar, I make CoD videos. http://www.youtube.com/user/DividerByZero
If you're close enough to your TV you can just plug them into a headphones jack. otherwise you'll need a 3.5mm to AV cable (and possible an extender for the cables)` --- "We are the cries of the class of '13, born in the era of humility. We are the desperate in the decline raised by the bastards of 1969!" 21CB - GD
Well, I assume you want game sound in your headphones. If you are using Component or Standard, then plug the RCA (red/white) cables into a RCA-stereo adapter. Then plug your headphones into that. If you use HDMI, I hope your TV has a headphone jack.
IF your headphones are surround, you probably want an optical cable for the sound, and then plug that into your processor. --- "We demand rigidly defined areas of doubt and uncertainty!"-Vroomfondel(The Hitchhiker's Guide to the Galaxy).
Or you could spend $1.22 and get chat the easiest way possible.
http://www.monoprice.com/products/product.asp?c_id=104&cp_id=10401&cs_id=1040109&p_id=2780&seq=1&format=2 --- The Church of Vector: Jesus Kriss our savior. http://i46.photobucket.com/albums/f141/MistaSkyline/oax91l.jpg