[SDL] Audio plays too fast!

[Ryan C. Gordon]

> What would cause SDL to play the audio too fast?

Likely culprits:
1) You are playing back in stereo but feeding it mono data, so it's 
playing out of two channels at twice the speed of one.
2) You couldn't get the audio device to open at 16k, and are feeding it 
at the wrong sample rate.
3) You're doing everything right, but SDL is converting between 16k and 
some non-power-of-two sample rate incorrectly (it only handles 
doubling/halving the rate, like 11k -> 22k -> 44k, not 16k -> 44k, for 
example). This is a known SDL bug.

--ryan.