Bounce an AudioBuffer to WAV with RecorderWorker.js

bounce.js

// assuming you have an AudioBuffer instance called `buffer`, 
// and an AudioContext (or OfflineAudioContext) called `ctx`...


// create a new Worker...
var worker = new Worker('recorderWorker.js');

// get it started and send some config data...
worker.postMessage({
  command: 'init',
  config: {
    sampleRate: ctx.sampleRate
  }
});

// pass it your full buffer...
worker.postMessage({
  command: 'record',
  buffer: [
    buffer.getChannelData(0),
    buffer.getChannelData(1)
  ]
});

// ask it to export your WAV...
worker.postMessage({
  command: 'exportWAV',
  type: 'audio/wav'
});

// force a download when it's done
worker.onmessage = function(e){
  Recorder.forceDownload(e.data, 'SomeFileName.wav');
};

Configuring numChannels was necessary to get this to work.