mirror of
https://github.com/Tonejs/Tone.js
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111 lines
3 KiB
TypeScript
111 lines
3 KiB
TypeScript
import { MidSideEffect, MidSideEffectOptions } from "../effect/MidSideEffect";
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import { Signal } from "../signal/Signal";
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import { Multiply } from "../signal/Multiply";
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import { Subtract } from "../signal/Subtract";
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import { NormalRange } from "../core/type/Units";
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import { optionsFromArguments } from "../core/util/Defaults";
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import { readOnly } from "../core/util/Interface";
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import { connect } from "../core/context/ToneAudioNode";
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export interface StereoWidenerOptions extends MidSideEffectOptions {
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width: NormalRange;
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}
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/**
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* 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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* ```
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* Mid *= 2*(1-width)<br>
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* Side *= 2*width
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* ```
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*/
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export class StereoWidener extends MidSideEffect<StereoWidenerOptions> {
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readonly name: string = "StereoWidener";
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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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*/
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readonly width: Signal<"normalRange">;
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/**
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* Two times the (1-width) for the mid channel
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*/
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private _twoTimesWidthMid: Multiply;
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/**
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* Two times the width for the side channel
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*/
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private _twoTimesWidthSide: Multiply;
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/**
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* Mid multiplier
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*/
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private _midMult: Multiply;
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/**
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* 1 - width
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*/
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private _oneMinusWidth: Subtract;
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/**
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* Side multiplier
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*/
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private _sideMult: Multiply;
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/**
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* @param 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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constructor(width?: NormalRange);
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constructor(options?: Partial<StereoWidenerOptions>);
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constructor() {
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super(optionsFromArguments(StereoWidener.getDefaults(), arguments, ["width"]));
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const options = optionsFromArguments(StereoWidener.getDefaults(), arguments, ["width"]);
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this.width = new Signal({
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context: this.context,
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value: options.width,
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units: "normalRange",
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});
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readOnly(this, ["width"]);
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this._twoTimesWidthMid = new Multiply({
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context: this.context,
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value: 2,
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});
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this._twoTimesWidthSide = new Multiply({
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context: this.context,
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value: 2,
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});
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this._midMult = new Multiply({ context: this.context });
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this._twoTimesWidthMid.connect(this._midMult.factor);
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this.connectEffectMid(this._midMult);
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this._oneMinusWidth = new Subtract({ context: this.context });
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this._oneMinusWidth.connect(this._twoTimesWidthMid);
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connect(this.context.getConstant(1), this._oneMinusWidth);
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this.width.connect(this._oneMinusWidth.subtrahend);
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this._sideMult = new Multiply({ context: this.context });
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this.width.connect(this._twoTimesWidthSide);
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this._twoTimesWidthSide.connect(this._sideMult.factor);
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this.connectEffectMid(this._sideMult);
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}
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static getDefaults(): StereoWidenerOptions {
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return Object.assign(MidSideEffect.getDefaults(), {
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width: 0.5,
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});
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}
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dispose(): this {
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super.dispose();
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this.width.dispose();
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this._midMult.dispose();
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this._sideMult.dispose();
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this._twoTimesWidthMid.dispose();
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this._twoTimesWidthSide.dispose();
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this._oneMinusWidth.dispose();
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return this;
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}
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}
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