chunktowav.js

var chunkToWAV = (function(chunkSize){

  var head = atob(
    'UklGRiQAAABXQVZFZm10IBAAAAABAAEAgD4AAAB9AAACABAAZGF0YQAAAAA='
  )

  var buffer = new ArrayBuffer(head.length + chunkSize)
  var view = new DataView(buffer)

  for (var i = 0; i < head.length; i++) {
    view.setUint8(i, head.charCodeAt(i))
  }

  var dataArray = new Int16Array(buffer)
  return function toWAV(chunk) {
    dataArray.set(new Int16Array(chunk), 22)
    return buffer
  }

})(640)



/// usage

var AudioContext = window.AudioContext || window.webkitAudioContext;
var context = new AudioContext();

var time = 0
ws.onmessage = function(e){

  var wav = chunkToWAV(e.data)

  context.decodeAudioData(wav, function(buffer) {
    var source = context.createBufferSource()

    source.buffer = buffer

    source.start(time += buffer.duration)

    source.connect(context.destination)

  })

}