Tone.js/Tone/shim/ConstantSourceNode.js

import Tone from "../core/Tone";
import "../shim/AudioContext";
import "../core/Context";
import "../core/Gain";

if (Tone.supported && !Tone.global.AudioContext.prototype.createConstantSource){

	var ConstantSourceNode = function(context){
		this.context = context;

		var buffer = context.createBuffer(1, 128, context.sampleRate);
		var arr = buffer.getChannelData(0);
		for (var i = 0; i < arr.length; i++){
			arr[i] = 1;
		}

		this._bufferSource = context.createBufferSource();
		this._bufferSource.channelCount = 1;
		this._bufferSource.channelCountMode = "explicit";
		this._bufferSource.buffer = buffer;
		this._bufferSource.loop = true;

		var gainNode = this._output = context.createGain();
		this.offset = gainNode.gain;

		this._bufferSource.connect(gainNode);
	};

	ConstantSourceNode.prototype.start = function(time){
		this._bufferSource.start(time);
		return this;
	};

	ConstantSourceNode.prototype.stop = function(time){
		this._bufferSource.stop(time);
		return this;
	};

	ConstantSourceNode.prototype.connect = function(){
		this._output.connect.apply(this._output, arguments);
		return this;
	};

	ConstantSourceNode.prototype.disconnect = function(){
		this._output.disconnect.apply(this._output, arguments);
		return this;
	};

	AudioContext.prototype.createConstantSource = function(){
		return new ConstantSourceNode(this);
	};

	Tone.Context.prototype.createConstantSource = function(){
		return new ConstantSourceNode(this);
	};
}