Experiment to get client-side waveform rendering of an audio track.

http://fixplz.blourp.com/wavevis/waveform.html

Currently works in Chrome through the 'webkitAudioContext' object.

Firefox only has their own useless nonstandard sound API thing that makes Flash look good.

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Remember to run Chrome locally with --allow-file-access-from-files.

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Waveform :: ({file, canvas, onStatus, onReady}) -> {
  playback :: { moveCursor :: (Num) -> () }
  view :: {
    play     :: -> ()
    playAt   :: (Num) -> ()
    getTime  :: -> Num
    pause    :: -> ()
    isPaused :: -> Bool
  }
}