mirror of
https://github.com/Tonejs/Tone.js
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110 lines
2.8 KiB
JavaScript
110 lines
2.8 KiB
JavaScript
define(["../core/Tone", "../effect/MidSideEffect", "../signal/Signal",
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"../signal/Multiply", "../signal/Subtract"], function(Tone){
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"use strict";
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/**
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* @class Applies a width factor to the mid/side seperation.
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* 0 is all mid and 1 is all side.
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* Algorithm found in [kvraudio forums](http://www.kvraudio.com/forum/viewtopic.php?t=212587).
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* <br><br>
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* <code>
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* Mid *= 2*(1-width)<br>
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* Side *= 2*width
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* </code>
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*
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* @extends {Tone.MidSideEffect}
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* @constructor
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* @param {NormalRange|Object} [width] The stereo width. A width of 0 is mono and 1 is stereo. 0.5 is no change.
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*/
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Tone.StereoWidener = function(){
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var options = Tone.defaults(arguments, ["width"], Tone.StereoWidener);
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Tone.MidSideEffect.call(this, options);
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/**
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* The width control. 0 = 100% mid. 1 = 100% side. 0.5 = no change.
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* @type {NormalRange}
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* @signal
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*/
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this.width = new Tone.Signal(options.width, Tone.Type.NormalRange);
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this._readOnly(["width"]);
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/**
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* Two times the (1-width) for the mid channel
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* @type {Tone.Multiply}
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* @private
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*/
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this._twoTimesWidthMid = new Tone.Multiply(2);
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/**
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* Two times the width for the side channel
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* @type {Tone.Multiply}
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* @private
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*/
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this._twoTimesWidthSide = new Tone.Multiply(2);
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/**
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* Mid multiplier
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* @type {Tone.Multiply}
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* @private
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*/
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this._midMult = new Tone.Multiply();
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this._twoTimesWidthMid.connect(this._midMult, 0, 1);
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this.midSend.chain(this._midMult, this.midReturn);
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/**
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* 1 - width
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* @type {Tone}
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*/
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this._oneMinusWidth = new Tone.Subtract();
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this._oneMinusWidth.connect(this._twoTimesWidthMid);
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this.context.getConstant(1).connect(this._oneMinusWidth, 0, 0);
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this.width.connect(this._oneMinusWidth, 0, 1);
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/**
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* Side multiplier
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* @type {Tone.Multiply}
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* @private
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*/
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this._sideMult = new Tone.Multiply();
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this.width.connect(this._twoTimesWidthSide);
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this._twoTimesWidthSide.connect(this._sideMult, 0, 1);
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this.sideSend.chain(this._sideMult, this.sideReturn);
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};
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Tone.extend(Tone.StereoWidener, Tone.MidSideEffect);
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/**
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* the default values
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* @static
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* @type {Object}
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*/
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Tone.StereoWidener.defaults = {
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"width" : 0.5
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};
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/**
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* Clean up.
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* @returns {Tone.StereoWidener} this
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*/
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Tone.StereoWidener.prototype.dispose = function(){
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Tone.MidSideEffect.prototype.dispose.call(this);
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this._writable(["width"]);
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this.width.dispose();
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this.width = null;
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this._midMult.dispose();
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this._midMult = null;
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this._sideMult.dispose();
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this._sideMult = null;
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this._twoTimesWidthMid.dispose();
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this._twoTimesWidthMid = null;
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this._twoTimesWidthSide.dispose();
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this._twoTimesWidthSide = null;
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this._oneMinusWidth.dispose();
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this._oneMinusWidth = null;
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return this;
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};
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return Tone.StereoWidener;
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});
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