koron/audio.html

## audio.html
<!doctype html>
<body onload="load();">
<button onclick="play();">Play</button>
<button onclick="stop();">Stop</button>

<script>

var Player = function() {
  if (window.webkitAudioContext) {
    this.context = new webkitAudioContext();
  } else {
    this.context = new AudioContext();
  }
  this.node = this.context.createScriptProcessor(16384, 0, 1);
  this.count = 0;
  this.pos = 0;
  var Z = this;

  var freq = 440;

  this.node.onaudioprocess = function(e) {
    var data = e.outputBuffer.getChannelData(0);
    //var k = freq * 2 * Math.PI / Z.context.sampleRate;
    var k = Z.context.sampleRate / (freq * 2);
    for (var i = 0; i < 16384; ++i) {
      data[i] = ((Math.floor(Z.pos / k) % 2) * 2 - 1) * .2;
      ++Z.pos;
    }
  };
}

Player.prototype.play = function() {
  this.pos = 0;
  this.node.connect(this.context.destination);
}

Player.prototype.stop = function() {
  this.node.disconnect();
}

var player;

function load() {
  player = new Player();
}

function play() {
  player.play();
}

function stop() {
  player.stop();
}
</script>
</body>
	<!doctype html>
	<body onload="load();">
	<button onclick="play();">Play</button>
	<button onclick="stop();">Stop</button>

	<script>

	var Player = function() {
	if (window.webkitAudioContext) {
	this.context = new webkitAudioContext();
	} else {
	this.context = new AudioContext();
	}
	this.node = this.context.createScriptProcessor(16384, 0, 1);
	this.count = 0;
	this.pos = 0;
	var Z = this;

	var freq = 440;

	this.node.onaudioprocess = function(e) {
	var data = e.outputBuffer.getChannelData(0);
	//var k = freq * 2 * Math.PI / Z.context.sampleRate;
	var k = Z.context.sampleRate / (freq * 2);
	for (var i = 0; i < 16384; ++i) {
	data[i] = ((Math.floor(Z.pos / k) % 2) * 2 - 1) * .2;
	++Z.pos;
	}
	};
	}

	Player.prototype.play = function() {
	this.pos = 0;
	this.node.connect(this.context.destination);
	}

	Player.prototype.stop = function() {
	this.node.disconnect();
	}

	var player;

	function load() {
	player = new Player();
	}

	function play() {
	player.play();
	}

	function stop() {
	player.stop();
	}
	</script>
	</body>