recorder.js

(function(window){

  var WORKER_PATH = 'recorderWorker.js';
  var Recorder = function(source, cfg){
    var config = cfg || {};
    var bufferLen = config.bufferLen || 4096;
    this.context = source.context;
    this.node = this.context.createScriptProcessor(bufferLen, 2, 2);
    var worker = new Worker(config.workerPath || WORKER_PATH);
    worker.postMessage({
      command: 'init',
      config: {
        sampleRate: this.context.sampleRate
      }
    });
    var recording = false,
      currCallback;

    this.node.onaudioprocess = function(e){
      if (!recording) return;
      worker.postMessage({
        command: 'record',
        buffer: [
          e.inputBuffer.getChannelData(0),
          e.inputBuffer.getChannelData(1)
        ]
      });
    }

    this.configure = function(cfg){
      for (var prop in cfg){
        if (cfg.hasOwnProperty(prop)){
          config[prop] = cfg[prop];
        }
      }
    }

    this.record = function(){
   
      recording = true;
    }

    this.stop = function(){
    
      recording = false;
    }

    this.clear = function(){
      worker.postMessage({ command: 'clear' });
    }

    this.getBuffer = function(cb) {
      currCallback = cb || config.callback;
      worker.postMessage({ command: 'getBuffer' })
    }

    this.exportWAV = function(cb, type){
      currCallback = cb || config.callback;
      type = type || config.type || 'audio/wav';
      if (!currCallback) throw new Error('Callback not set');
      worker.postMessage({
        command: 'exportWAV',
        type: type
      });
    }

    worker.onmessage = function(e){
      var blob = e.data;
      currCallback(blob);
    }

    source.connect(this.node);
    this.node.connect(this.context.destination);    //this should not be necessary
  };

  Recorder.forceDownload = function(blob, filename){
    var url = (window.URL || window.webkitURL).createObjectURL(blob);
    var link = window.document.createElement('a');
    link.href = url;
    link.download = filename || 'output.wav';
    var click = document.createEvent("Event");
    click.initEvent("click", true, true);
    link.dispatchEvent(click);
  }

  window.Recorder = Recorder;

})(window);

//ADDITIONAL JS recorderWorker.js
var recLength = 0,
  recBuffersL = [],
  recBuffersR = [],
  sampleRate;
this.onmessage = function(e){
  switch(e.data.command){
    case 'init':
      init(e.data.config);
      break;
    case 'record':
      record(e.data.buffer);
      break;
    case 'exportWAV':
      exportWAV(e.data.type);
      break;
    case 'getBuffer':
      getBuffer();
      break;
    case 'clear':
      clear();
      break;
  }
};

function init(config){
  sampleRate = config.sampleRate;
}

function record(inputBuffer){

  recBuffersL.push(inputBuffer[0]);
  recBuffersR.push(inputBuffer[1]);
  recLength += inputBuffer[0].length;
}

function exportWAV(type){
  var bufferL = mergeBuffers(recBuffersL, recLength);
  var bufferR = mergeBuffers(recBuffersR, recLength);
  var interleaved = interleave(bufferL, bufferR);
  var dataview = encodeWAV(interleaved);
  var audioBlob = new Blob([dataview], { type: type });

  this.postMessage(audioBlob);
}

function getBuffer() {
  var buffers = [];
  buffers.push( mergeBuffers(recBuffersL, recLength) );
  buffers.push( mergeBuffers(recBuffersR, recLength) );
  this.postMessage(buffers);
}

function clear(){
  recLength = 0;
  recBuffersL = [];
  recBuffersR = [];
}

function mergeBuffers(recBuffers, recLength){
  var result = new Float32Array(recLength);
  var offset = 0;
  for (var i = 0; i < recBuffers.length; i++){
    result.set(recBuffers[i], offset);
    offset += recBuffers[i].length;
  }
  return result;
}

function interleave(inputL, inputR){
  var length = inputL.length + inputR.length;
  var result = new Float32Array(length);

  var index = 0,
    inputIndex = 0;

  while (index < length){
    result[index++] = inputL[inputIndex];
    result[index++] = inputR[inputIndex];
    inputIndex++;
  }
  return result;
}

function floatTo16BitPCM(output, offset, input){
  for (var i = 0; i < input.length; i++, offset+=2){
    var s = Math.max(-1, Math.min(1, input[i]));
    output.setInt16(offset, s < 0 ? s * 0x8000 : s * 0x7FFF, true);
  }
}

function writeString(view, offset, string){
  for (var i = 0; i < string.length; i++){
    view.setUint8(offset + i, string.charCodeAt(i));
  }
}

function encodeWAV(samples){
  var buffer = new ArrayBuffer(44 + samples.length * 2);
  var view = new DataView(buffer);

  /* RIFF identifier */
  writeString(view, 0, 'RIFF');
  /* file length */
  view.setUint32(4, 32 + samples.length * 2, true);
  /* RIFF type */
  writeString(view, 8, 'WAVE');
  /* format chunk identifier */
  writeString(view, 12, 'fmt ');
  /* format chunk length */
  view.setUint32(16, 16, true);
  /* sample format (raw) */
  view.setUint16(20, 1, true);
  /* channel count */
  view.setUint16(22, 2, true);
  /* sample rate */
  view.setUint32(24, sampleRate, true);
  /* byte rate (sample rate * block align) */
  view.setUint32(28, sampleRate * 4, true);
  /* block align (channel count * bytes per sample) */
  view.setUint16(32, 4, true);
  /* bits per sample */
  view.setUint16(34, 16, true);
  /* data chunk identifier */
  writeString(view, 36, 'data');
  /* data chunk length */
  view.setUint32(40, samples.length * 2, true);

  floatTo16BitPCM(view, 44, samples);

  return view;
}