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https://github.com/Tonejs/Tone.js
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132 lines
4 KiB
TypeScript
132 lines
4 KiB
TypeScript
import { AmplitudeEnvelope } from "../component/envelope/AmplitudeEnvelope";
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import { Envelope, EnvelopeOptions } from "../component/envelope/Envelope";
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import { ToneAudioNode, ToneAudioNodeOptions } from "../core/context/ToneAudioNode";
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import { Cents, Frequency, Seconds } from "../core/type/Units";
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import { omitFromObject, optionsFromArguments } from "../core/util/Defaults";
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import { readOnly } from "../core/util/Interface";
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import { RecursivePartial } from "../core/util/Interface";
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import { Signal } from "../signal/Signal";
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import { OmniOscillator } from "../source/oscillator/OmniOscillator";
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import { OmniOscillatorConstructorOptions, OmniOscillatorSynthOptions } from "../source/oscillator/OscillatorInterface";
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import { Source, SourceOptions } from "../source/Source";
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import { Monophonic, MonophonicOptions } from "./Monophonic";
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export interface SynthOptions extends MonophonicOptions {
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oscillator: OmniOscillatorSynthOptions;
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envelope: Omit<EnvelopeOptions, keyof ToneAudioNodeOptions>;
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}
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/**
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* Synth is composed simply of a {@link OmniOscillator} routed through an {@link AmplitudeEnvelope}.
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* ```
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* +----------------+ +-------------------+
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* | OmniOscillator +>--> AmplitudeEnvelope +>--> Output
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* +----------------+ +-------------------+
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* ```
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* @param options the options available for the synth.
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* @example
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* var synth = new Synth().toDestination();
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* synth.triggerAttackRelease("C4", "8n");
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*/
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export class Synth<Options extends SynthOptions = SynthOptions> extends Monophonic<Options> {
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readonly name: string = "Synth";
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/**
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* The oscillator.
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*/
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readonly oscillator: OmniOscillator<any>;
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/**
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* The frequency signal
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*/
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readonly frequency: Signal<Frequency>;
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/**
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* The detune signal
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*/
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readonly detune: Signal<Cents>;
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/**
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* The envelope
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*/
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readonly envelope: AmplitudeEnvelope;
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constructor(options?: RecursivePartial<SynthOptions>);
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constructor() {
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super(optionsFromArguments(Synth.getDefaults(), arguments));
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const options = optionsFromArguments(Synth.getDefaults(), arguments);
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this.oscillator = new OmniOscillator(Object.assign({
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context: this.context,
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onstop: () => this.onsilence(this),
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}, options.oscillator));
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this.frequency = this.oscillator.frequency;
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this.detune = this.oscillator.detune;
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this.envelope = new AmplitudeEnvelope(Object.assign({
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context: this.context,
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}, options.envelope));
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// connect the oscillators to the output
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this.oscillator.chain(this.envelope, this.output);
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readOnly(this, ["oscillator", "frequency", "detune", "envelope"]);
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}
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static getDefaults(): SynthOptions {
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return Object.assign(Monophonic.getDefaults(), {
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envelope: Object.assign(
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omitFromObject(Envelope.getDefaults(), Object.keys(ToneAudioNode.getDefaults())),
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{
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attack : 0.005,
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decay : 0.1,
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release : 1,
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sustain : 0.3,
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},
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),
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oscillator: Object.assign(
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omitFromObject(OmniOscillator.getDefaults(), [...Object.keys(Source.getDefaults()), "frequency", "detune"]),
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{
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type: "triangle",
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},
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),
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});
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}
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/**
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* start the attack portion of the envelope
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* @param time the time the attack should start
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* @param velocity the velocity of the note (0-1)
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*/
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protected _triggerEnvelopeAttack(time: Seconds, velocity: number): void {
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// the envelopes
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this.envelope.triggerAttack(time, velocity);
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this.oscillator.start(time);
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// if there is no release portion, stop the oscillator
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if (this.envelope.sustain === 0) {
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const computedAttack = this.toSeconds(this.envelope.attack);
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const computedDecay = this.toSeconds(this.envelope.decay);
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this.oscillator.stop(time + computedAttack + computedDecay);
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}
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}
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/**
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* start the release portion of the envelope
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* @param time the time the release should start
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*/
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protected _triggerEnvelopeRelease(time: Seconds): void {
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this.envelope.triggerRelease(time);
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this.oscillator.stop(time + this.toSeconds(this.envelope.release));
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}
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/**
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* clean up
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*/
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dispose(): this {
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super.dispose();
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this.oscillator.dispose();
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this.envelope.dispose();
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return this;
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}
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}
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