How can I play my Xbox game audio over bluetooth?

I have a set of very nice bluetooth headphones. What kind of an adapter or whatever do I need to get to be able to play a game on myTV and have ALL TV audio play on the speakers at a decent quality? I won't use this for online games, so don't worry about other headsets or anything. The proper solution would be something I plug into the headphone jack on my TV, so I could watch TV and listen to it only on the headphones. Thanks!