soundtrack.js

Make handling the soundtracks to your HTML5/JS games somewhat easier. ES6/JS2015 with CommonJS bindings.

TL;DR

  var soundtrack = require('soundtrack').soundtrack,
      bg_track   = new soundtrack([ 'song1', 'song2', 'song3' ]);

  bg_track.play('song2');

What's the point?

This library is primarily intended to make soundtracks out of loopable MP3s.

Handling seamless looping music in JavaScript is surprisingly hard, because of the timing situation - neither the HTML5 Audio object nor WebAudio AudioContext's events fire fast enough to handle seamless looping (the spec allows 15ms to 250ms.) HTML5 setInterval, however, has been set to a floor of 4ms, which is satisfactory.

This library wraps up the ho-hum, teaches songs to know whether they loop, provides start, end, and loop points for songs, offers high resolution (4-6ms in practice, though undefined) callbacks for hitting music timings, and generally just makes it easier to deal with high resolution audio timing.

Polemic

soundtrack.js is MIT licensed, because viral licenses and newspeak language modification are evil.
Free is only free when it's free for everyone.