Web Audio API Playback

webAudioApiTest.js

// #1 Launch Chrome
//    #1.1 If you are on the Beta channel you are fine
//    #1.2 If you are not on the Beta channel enable Web Audio API in about:flags
// #2 Ctrl+Shift+C or Apple+Shift+J
// #3 Open Console
// #4 Paste
var bufferSize = 2048
var ctx = new webkitAudioContext()
var js = ctx.createJavaScriptNode(bufferSize, 0, 1)
var phase = 0.0
var phaseInc = 440.0/ctx.sampleRate
js.connect(ctx.destination, 0)
js.onaudioprocess = function(e) {
  var l = e.outputBuffer.getChannelData(0)
  var r = e.outputBuffer.getChannelData(1)
  var n = e.outputBuffer.length
  for(var i = 0; i < n; i++) {
    phase += phaseInc
    if(phase > 1.0) { --phase }
    var amp = Math.sin(phase * Math.PI * 2.0)
    l[i] = r[i] = amp
  }
}