- fix some hella lame bugs inherited from sun, and clean up
- despite what the big clever comment says, callback thread will
be started twice if buffering is slow enough and will screw up
playback; guard it
- supports s16 big endian as well
- audio_callback is void
- dont print stuff to stdout/stderr in the backend
- appropriately set writing buffer
- be more careful with lists in the audio callback
- create worker thread little bit earlier
- things i've forgotten to summarize
should fix stuttering videos & out-of-sync audio in weird cases.
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