There is the basic stuff you will need on the mplayer gui thread.
Grab that code. look though it. replace mplayer with gnuboy, strip logic, remap locations on screen to keycodes, inject to gnuboy, service both threads.
Let's have it
Audiophile and electron bully
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Kung-Fu. Hard work over time to accomplish skill. A painter can have kung-fu... The musician can have kung-fu, or the poet who paints pictures with words and makes emperors weep. This, too, is kung-fu. Formless, nameless, the true master dwells within. Only you can free him.
The album I'm headlining on at the moment: s.beatport.com/OCp9dT - FREE: 2012 Award winning set