tone
Version:
A Web Audio framework for making interactive music in the browser.
65 lines • 2.44 kB
JavaScript
import { MidSideEffect, } from "../effect/MidSideEffect.js";
import { Signal } from "../signal/Signal.js";
import { Multiply } from "../signal/Multiply.js";
import { Subtract } from "../signal/Subtract.js";
import { optionsFromArguments } from "../core/util/Defaults.js";
import { readOnly } from "../core/util/Interface.js";
import { connect } from "../core/context/ToneAudioNode.js";
/**
* Applies a width factor to the mid/side seperation.
* 0 is all mid and 1 is all side.
* Algorithm found in [kvraudio forums](http://www.kvraudio.com/forum/viewtopic.php?t=212587).
* ```
* Mid *= 2*(1-width)<br>
* Side *= 2*width
* ```
* @category Effect
*/
export class StereoWidener extends MidSideEffect {
constructor() {
const options = optionsFromArguments(StereoWidener.getDefaults(), arguments, ["width"]);
super(options);
this.name = "StereoWidener";
this.width = new Signal({
context: this.context,
value: options.width,
units: "normalRange",
});
readOnly(this, ["width"]);
this._twoTimesWidthMid = new Multiply({
context: this.context,
value: 2,
});
this._twoTimesWidthSide = new Multiply({
context: this.context,
value: 2,
});
this._midMult = new Multiply({ context: this.context });
this._twoTimesWidthMid.connect(this._midMult.factor);
this.connectEffectMid(this._midMult);
this._oneMinusWidth = new Subtract({ context: this.context });
this._oneMinusWidth.connect(this._twoTimesWidthMid);
connect(this.context.getConstant(1), this._oneMinusWidth);
this.width.connect(this._oneMinusWidth.subtrahend);
this._sideMult = new Multiply({ context: this.context });
this.width.connect(this._twoTimesWidthSide);
this._twoTimesWidthSide.connect(this._sideMult.factor);
this.connectEffectSide(this._sideMult);
}
static getDefaults() {
return Object.assign(MidSideEffect.getDefaults(), {
width: 0.5,
});
}
dispose() {
super.dispose();
this.width.dispose();
this._midMult.dispose();
this._sideMult.dispose();
this._twoTimesWidthMid.dispose();
this._twoTimesWidthSide.dispose();
this._oneMinusWidth.dispose();
return this;
}
}
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