* The APE SDK can only decode rather big chunks at a time (several
seconds), so our reader keeps an internal buffer of the last decoded
chunk.
* However, this was always dropped when seeking, meaning the same few
seconds of sound were decoded again and again.
* I'm not sure why MediaPlayer is trying to seek to the position it
already is at, but we can make it work, so why not.
Now the existing buffer is reused if possible when seeking. This makes
it possible to play APE files in MediaPlayer.
Also, several more style fixes.
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