mirror of
https://github.com/Tonejs/Tone.js
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65 lines
1.7 KiB
JavaScript
65 lines
1.7 KiB
JavaScript
define(["Tone/core/Tone", "Tone/effect/Effect", "Tone/signal/Signal"], function(Tone){
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/**
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* Feedback Effect (a sound loop between an audio source and its own output)
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*
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* @constructor
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* @extends {Tone.Effect}
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* @param {number=} initialFeedback the initial feedback value (defaults to 0.25)
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*/
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Tone.FeedbackEffect = function(initialFeedback){
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Tone.Effect.call(this);
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/**
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* controls the amount of feedback
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* @type {Tone.Signal}
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*/
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this.feedback = new Tone.Signal(this.defaultArg(initialFeedback, 0.25));
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/**
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* the gain which controls the feedback
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* @type {GainNode}
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* @private
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*/
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this._feedbackGain = this.context.createGain();
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//the feedback loop
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this.chain(this.effectReturn, this._feedbackGain, this.effectSend);
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this.feedback.connect(this._feedbackGain.gain);
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};
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Tone.extend(Tone.FeedbackEffect, Tone.Effect);
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/**
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* set the feedback amount
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*
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* @param {number} value the amount of feedback
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* @param {Tone.Time=} rampTime (optionally) set the ramp time it takes
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* to reach the new feedback value
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*/
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Tone.FeedbackEffect.prototype.setFeedback = function(value, rampTime){
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if (rampTime){
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this.feedback.linearRampToValueNow(value, rampTime);
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} else {
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this.feedback.setValue(value);
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}
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};
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/**
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* the parents dispose method
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* @private
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* @borrows Tone.Effect.dispose as Tone.FeedbackEffect._effectDispose
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*/
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Tone.FeedbackEffect.prototype._effectDispose = Tone.Effect.prototype.dispose;
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/**
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* clean up
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*/
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Tone.FeedbackEffect.prototype.dispose = function(){
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this._effectDispose();
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this.feedback.dispose();
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this._feedbackGain.disconnect();
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this.feedback = null;
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this._feedbackGain = null;
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};
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return Tone.FeedbackEffect;
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});
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