mirror of
https://github.com/Tonejs/Tone.js
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89 lines
2.3 KiB
TypeScript
89 lines
2.3 KiB
TypeScript
import { ToneAudioNode, ToneAudioNodeOptions } from "../../core/context/ToneAudioNode";
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import { Split } from "./Split";
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import { Add } from "../../signal/Add";
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import { Multiply } from "../../signal/Multiply";
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import { Subtract } from "../../signal/Subtract";
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import { optionsFromArguments } from "../../core/util/Defaults";
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export type MidSideSplitOptions = ToneAudioNodeOptions;
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/**
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* Mid/Side processing separates the the 'mid' signal (which comes out of both the left and the right channel)
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* and the 'side' (which only comes out of the the side channels).
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* ```
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* Mid = (Left+Right)/sqrt(2); // obtain mid-signal from left and right
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* Side = (Left-Right)/sqrt(2); // obtain side-signal from left and right
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* ```
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*/
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export class MidSideSplit extends ToneAudioNode<MidSideSplitOptions> {
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readonly name: string = "MidSideSplit";
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readonly input: Split;
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/**
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* There is no output node, use either [[mid]] or [[side]] outputs.
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*/
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readonly output: undefined;
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/**
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* Split the incoming signal into left and right channels
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*/
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private _split: Split;
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/**
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* Sums the left and right channels
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*/
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private _midAdd: Add;
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/**
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* Subtract left and right channels.
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*/
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private _sideSubtract: Subtract;
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/**
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* The "mid" output. `(Left+Right)/sqrt(2)`
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*/
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readonly mid: ToneAudioNode;
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/**
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* The "side" output. `(Left-Right)/sqrt(2)`
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*/
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readonly side: ToneAudioNode;
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constructor(options?: Partial<MidSideSplitOptions>);
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constructor() {
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super(optionsFromArguments(MidSideSplit.getDefaults(), arguments));
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this._split = this.input = new Split({
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channels: 2,
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context: this.context
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});
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this._midAdd = new Add({ context: this.context });
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this.mid = new Multiply({
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context: this.context,
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value: Math.SQRT1_2,
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});
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this._sideSubtract = new Subtract({ context: this.context });
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this.side = new Multiply({
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context: this.context,
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value: Math.SQRT1_2,
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});
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this._split.connect(this._midAdd, 0);
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this._split.connect(this._midAdd.addend, 1);
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this._split.connect(this._sideSubtract, 0);
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this._split.connect(this._sideSubtract.subtrahend, 1);
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this._midAdd.connect(this.mid);
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this._sideSubtract.connect(this.side);
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}
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dispose(): this {
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super.dispose();
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this.mid.dispose();
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this.side.dispose();
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this._midAdd.dispose();
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this._sideSubtract.dispose();
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this._split.dispose();
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return this;
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}
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}
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