websockets-streaming-audio/src/common_utils.js

Click a browser button to launch a node.js process on the server side which streams audio using web sockets back to the browser which is then rendered using web audio API My plan is to make this modular enough to get added to your process as simple API

var common_utils = (function() {

// ---------------------------

function setClone( ab ) {

      var f32 = new Float32Array(ab.length);
      f32.set(ab);
      return f32;
    }

// http://www.html5rocks.com/en/tutorials/webgl/typed_arrays/
// function memcpy(dst, dstOffset, src, srcOffset, length) {
//   var dstU8 = new Uint8Array(dst, dstOffset, length);
//   var srcU8 = new Uint8Array(src, srcOffset, length);
//   dstU8.set(srcU8);
// };


function memcpy_float_32_bit(dst, dstOffset, src, srcOffset, length) {

  var destination_float = new Float32Array(dst, dstOffset, length);
  var source_float      = new Float32Array(src, srcOffset, length);
  destination_float.set(source_float);

  return destination_float;
};





function time() {
  var now = new Date();
  var time = /(\d+:\d+:\d+)/.exec(now)[0] + ':';
  for (var ms = String(now.getMilliseconds()), i = ms.length - 3; i < 0; ++i) {
    time += '0';
  }
  return time + ms;
}

function source(s) {
  if (self.importScripts) {
    return '<span style="color:red;">worker_log:</span> ';
  } else {
    return '<span style="color:green;">thread:</span> ';
  }
}

function seconds(since) {
  return (new Date() - since) / 1000.0;
}

function toMB(bytes) {
  return Math.round(bytes / 1024 / 1024);
}


function toKB(bytes) {
  return Math.round(bytes / 1024);
}

// ---------------------------


function log(str) {
  var elem = document.getElementById('result');
  var log = function(s) {
   elem.innerHTML += ''.concat(time(), ' ', s, '\n');
  };
  log(str);
}

// --------------------

return {

	log : log,
	source : source,
	time : time,
	seconds : seconds,
	toMB : toMB,
	toKB : toKB,
	memcpy_float_32_bit : memcpy_float_32_bit

}

}());