mirror of
https://github.com/Tonejs/Tone.js
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118 lines
3 KiB
JavaScript
118 lines
3 KiB
JavaScript
define(["Tone/core/Tone", "Tone/signal/Signal", "Tone/signal/Subtract",
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"Tone/signal/EqualPowerGain", "Tone/core/Gain", "Tone/core/AudioNode"], function(Tone){
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"use strict";
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/**
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* @class Tone.Crossfade provides equal power fading between two inputs.
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* More on crossfading technique [here](https://en.wikipedia.org/wiki/Fade_(audio_engineering)#Crossfading).
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*
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* @constructor
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* @extends {Tone.AudioNode}
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* @param {NormalRange} [initialFade=0.5]
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* @example
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* var crossFade = new Tone.CrossFade(0.5);
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* //connect effect A to crossfade from
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* //effect output 0 to crossfade input 0
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* effectA.connect(crossFade, 0, 0);
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* //connect effect B to crossfade from
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* //effect output 0 to crossfade input 1
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* effectB.connect(crossFade, 0, 1);
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* crossFade.fade.value = 0;
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* // ^ only effectA is output
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* crossFade.fade.value = 1;
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* // ^ only effectB is output
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* crossFade.fade.value = 0.5;
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* // ^ the two signals are mixed equally.
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*/
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Tone.CrossFade = function(initialFade){
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Tone.AudioNode.call(this);
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this.createInsOuts(2, 1);
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/**
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* Alias for <code>input[0]</code>.
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* @type {Tone.Gain}
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*/
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this.a = this.input[0] = new Tone.Gain();
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/**
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* Alias for <code>input[1]</code>.
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* @type {Tone.Gain}
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*/
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this.b = this.input[1] = new Tone.Gain();
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/**
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* The mix between the two inputs. A fade value of 0
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* will output 100% <code>input[0]</code> and
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* a value of 1 will output 100% <code>input[1]</code>.
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* @type {NormalRange}
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* @signal
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*/
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this.fade = new Tone.Signal(Tone.defaultArg(initialFade, 0.5), Tone.Type.NormalRange);
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/**
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* equal power gain cross fade
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* @private
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* @type {Tone.EqualPowerGain}
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*/
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this._equalPowerA = new Tone.EqualPowerGain();
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/**
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* equal power gain cross fade
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* @private
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* @type {Tone.EqualPowerGain}
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*/
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this._equalPowerB = new Tone.EqualPowerGain();
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/**
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* invert the incoming signal
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* @private
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* @type {Tone}
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*/
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this._one = this.context.getConstant(1);
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/**
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* invert the incoming signal
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* @private
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* @type {Tone.Subtract}
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*/
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this._invert = new Tone.Subtract();
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//connections
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this.a.connect(this.output);
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this.b.connect(this.output);
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this.fade.chain(this._equalPowerB, this.b.gain);
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this._one.connect(this._invert, 0, 0);
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this.fade.connect(this._invert, 0, 1);
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this._invert.chain(this._equalPowerA, this.a.gain);
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this._readOnly("fade");
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};
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Tone.extend(Tone.CrossFade, Tone.AudioNode);
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/**
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* clean up
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* @returns {Tone.CrossFade} this
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*/
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Tone.CrossFade.prototype.dispose = function(){
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Tone.AudioNode.prototype.dispose.call(this);
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this._writable("fade");
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this._equalPowerA.dispose();
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this._equalPowerA = null;
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this._equalPowerB.dispose();
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this._equalPowerB = null;
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this.fade.dispose();
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this.fade = null;
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this._invert.dispose();
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this._invert = null;
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this._one = null;
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this.a.dispose();
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this.a = null;
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this.b.dispose();
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this.b = null;
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return this;
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};
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return Tone.CrossFade;
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});
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