mirror of
https://github.com/Tonejs/Tone.js
synced 2024-11-16 08:38:00 +00:00
400 lines
12 KiB
TypeScript
400 lines
12 KiB
TypeScript
import { MidiClass } from "../core/type/Midi";
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import { Frequency, MidiNote, NormalRange, Seconds, Time } from "../core/type/Units";
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import { deepMerge, optionsFromArguments } from "../core/util/Defaults";
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import { RecursivePartial } from "../core/util/Interface";
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import { isArray, isNumber } from "../core/util/TypeCheck";
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import { Instrument, InstrumentOptions } from "./Instrument";
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import { MembraneSynth, MembraneSynthOptions } from "./MembraneSynth";
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import { MetalSynth, MetalSynthOptions } from "./MetalSynth";
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import { Monophonic } from "./Monophonic";
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import { Synth, SynthOptions } from "./Synth";
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type VoiceConstructor<V> = {
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getDefaults: () => VoiceOptions<V>;
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} & (new (...args: any[]) => V);
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type OmitMonophonicOptions<T> = Omit<T, "context" | "onsilence">;
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type VoiceOptions<T> =
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T extends MembraneSynth ? MembraneSynthOptions :
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T extends MetalSynth ? MetalSynthOptions :
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T extends Synth ? SynthOptions :
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never;
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/**
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* The settable synth options. excludes monophonic options.
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*/
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type PartialVoiceOptions<T> = RecursivePartial<OmitMonophonicOptions<VoiceOptions<T>>>;
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export interface PolySynthOptions<Voice> extends InstrumentOptions {
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maxPolyphony: number;
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voice: VoiceConstructor<Voice>;
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options: PartialVoiceOptions<Voice>;
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}
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/**
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* PolySynth handles voice creation and allocation for any
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* instruments passed in as the second paramter. PolySynth is
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* not a synthesizer by itself, it merely manages voices of
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* one of the other types of synths, allowing any of the
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* monophonic synthesizers to be polyphonic.
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*
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* @example
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* var synth = new PolySynth(Tone.Synth, {
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* oscillator : {
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* type : "square"
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* }
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* }).toMaster();
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* //set the attributes using the set interface
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* synth.set("detune", -1200);
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* //play a chord
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* synth.triggerAttackRelease(["C4", "E4", "A4"], "4n");
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* @category Instrument
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*/
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export class PolySynth<Voice extends Monophonic<any> = Synth> extends Instrument<VoiceOptions<Voice>> {
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readonly name: string = "PolySynth";
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/**
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* The voices which are not currently in use
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*/
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private _availableVoices: Voice[] = [];
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/**
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* The currently active voices
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*/
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private _activeVoices: Array<{midi: MidiNote; voice: Voice}> = [];
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/**
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* All of the allocated voices for this synth.
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*/
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private _voices: Voice[] = [];
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/**
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* The options that are set on the synth.
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*/
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private options: VoiceOptions<Voice>;
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/**
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* The polyphony limit.
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*/
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maxPolyphony: number;
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/**
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* The voice constructor
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*/
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private readonly voice: VoiceConstructor<Voice>;
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/**
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* The GC timeout. Held so that it could be cancelled when the node is disposed.
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*/
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private _gcTimeout: number = -1;
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/**
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* A moving average of the number of active voices
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*/
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private _averageActiveVoices: number = 0;
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/**
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* @param voice The constructor of the voices
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* @param options The options object to set the synth voice
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*/
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constructor(
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voice?: VoiceConstructor<Voice>,
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options?: PartialVoiceOptions<Voice>,
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);
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constructor(options?: Partial<PolySynthOptions<Voice>>);
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constructor() {
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super(optionsFromArguments(PolySynth.getDefaults(), arguments, ["voice", "options"]));
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const options = optionsFromArguments(PolySynth.getDefaults(), arguments, ["voice", "options"]);
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// check against the old API (pre 14.3.0)
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this.assert(!isNumber(options.voice), "DEPRECATED: The polyphony count is no longer the first argument.");
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const defaults = options.voice.getDefaults();
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this.options = Object.assign(defaults, options.options) as VoiceOptions<Voice>;
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this.voice = options.voice as unknown as VoiceConstructor<Voice>;
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this.maxPolyphony = options.maxPolyphony;
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// kick off the GC interval
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this._gcTimeout = this.context.setInterval(this._collectGarbage.bind(this), 1);
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}
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static getDefaults(): PolySynthOptions<Synth> {
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return Object.assign(Instrument.getDefaults(), {
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maxPolyphony: 32,
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options: {},
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voice: Synth,
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});
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}
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/**
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* The number of active voices.
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*/
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get activeVoices(): number {
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return this._activeVoices.length;
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}
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/**
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* If there is a voice active on that note, return it
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*/
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private _getActiveVoice(note: MidiNote): Voice | undefined {
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const event = this._activeVoices.find(({ midi }) => midi === note);
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if (event) {
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return event.voice;
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}
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}
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/**
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* Invoked when the source is done making sound, so that it can be
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* readded to the pool of available voices
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*/
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private _makeVoiceAvailable(voice: Voice): void {
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this._availableVoices.push(voice);
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// remove the midi note from 'active voices'
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const activeVoiceIndex = this._activeVoices.findIndex((e) => e.voice === voice);
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this._activeVoices.splice(activeVoiceIndex, 1);
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}
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/**
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* Get an available voice from the pool of available voices.
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* If one is not available and the maxPolyphony limit is reached,
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* steal a voice, otherwise return null.
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*/
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private _getNextAvailableVoice(): Voice | undefined {
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// if there are available voices, return the first one
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if (this._availableVoices.length) {
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return this._availableVoices.shift();
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} else if (this._voices.length < this.maxPolyphony) {
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// otherwise if there is still more maxPolyphony, make a new voice
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const voice = new this.voice(Object.assign(this.options, {
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context: this.context,
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onsilence: this._makeVoiceAvailable.bind(this),
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}));
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voice.connect(this.output);
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this._voices.push(voice);
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return voice;
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} else {
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console.warn("Max polyphony exceeded. Note dropped.");
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}
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}
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/**
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* Occasionally check if there are any allocated voices which can be cleaned up.
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*/
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private _collectGarbage(): void {
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this._averageActiveVoices = Math.max(this._averageActiveVoices * 0.95, this.activeVoices);
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if (this._availableVoices.length && this._voices.length > this._averageActiveVoices) {
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// take off an available note
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const firstAvail = this._availableVoices.shift() as Voice;
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const index = this._voices.indexOf(firstAvail);
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this._voices.splice(index, 1);
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firstAvail.dispose();
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}
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}
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/**
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* Internal method which triggers the attack
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*/
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private _triggerAttack(notes: Frequency[], time: Seconds, velocity?: NormalRange): void {
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notes.forEach(note => {
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const midiNote = new MidiClass(this.context, note).toMidi();
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// let voice: Voice | undefined;
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// if there's already a note at that voice, reuse it
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let voice = this._getActiveVoice(midiNote);
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// if it has a note, and that note is still active
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if (voice && voice.getLevelAtTime(time) > 0) {
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const activeVoiceIndex = this._activeVoices.findIndex((e) => e.voice === voice);
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this._activeVoices.splice(activeVoiceIndex, 1);
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} else {
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// otherwise get the next available voice
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voice = this._getNextAvailableVoice();
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}
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if (voice) {
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voice.triggerAttack(note, time, velocity);
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this._activeVoices.unshift({
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midi: midiNote, voice,
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});
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this.log("triggerAttack", note, time);
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}
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});
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}
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/**
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* Internal method which triggers the release
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*/
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private _triggerRelease(notes: Frequency[], time: Seconds): void {
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notes.forEach(note => {
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const midiNote = new MidiClass(this.context, note).toMidi();
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const voice = this._getActiveVoice(midiNote);
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if (voice) {
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// trigger release on that note
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voice.triggerRelease(time);
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this.log("triggerRelease", note, time);
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}
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});
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}
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/**
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* Schedule the attack/release events. If the time is in the future, then it should set a timeout
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* to wait for just-in-time scheduling
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*/
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private _scheduleEvent(type: "attack" | "release", notes: Frequency[], time: Seconds, velocity?: NormalRange): void {
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this.assert(!this.disposed, "Synth was already disposed");
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// if the notes are greater than this amount of time in the future, they should be scheduled with setTimeout
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if (time <= this.now()) {
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// do it immediately
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if (type === "attack") {
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this._triggerAttack(notes, time, velocity);
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} else {
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this._triggerRelease(notes, time);
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}
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} else {
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// schedule it to start in the future
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this.context.setTimeout(() => {
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this._scheduleEvent(type, notes, time, velocity);
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}, time - this.now());
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}
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}
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/**
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* Trigger the attack portion of the note
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* @param notes The notes to play. Accepts a single Frequency or an array of frequencies.
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* @param time The start time of the note.
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* @param velocity The velocity of the note.
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* @example
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* //trigger a chord immediately with a velocity of 0.2
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* poly.triggerAttack(["Ab3", "C4", "F5"], undefined, 0.2);
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*/
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triggerAttack(notes: Frequency | Frequency[], time?: Time, velocity?: NormalRange): this {
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if (!Array.isArray(notes)) {
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notes = [notes];
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}
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const computedTime = this.toSeconds(time);
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this._scheduleEvent("attack", notes, computedTime, velocity);
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return this;
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}
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/**
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* Trigger the release of the note. Unlike monophonic instruments,
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* a note (or array of notes) needs to be passed in as the first argument.
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* @param notes The notes to play. Accepts a single Frequency or an array of frequencies.
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* @param time When the release will be triggered.
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* @example
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* poly.triggerRelease(["Ab3", "C4", "F5"], "+2n");
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*/
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triggerRelease(notes: Frequency | Frequency[], time?: Time): this {
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if (!Array.isArray(notes)) {
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notes = [notes];
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}
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const computedTime = this.toSeconds(time);
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this._scheduleEvent("release", notes, computedTime);
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return this;
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}
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/**
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* Trigger the attack and release after the specified duration
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* @param notes The notes to play. Accepts a single Frequency or an array of frequencies.
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* @param duration the duration of the note
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* @param time if no time is given, defaults to now
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* @param velocity the velocity of the attack (0-1)
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* @example
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* //trigger a chord for a duration of a half note
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* poly.triggerAttackRelease(["Eb3", "G4", "C5"], "2n");
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* @example
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* //can pass in an array of durations as well
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* poly.triggerAttackRelease(["Eb3", "G4", "C5"], ["2n", "4n", "4n"]);
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*/
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triggerAttackRelease(
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notes: Frequency | Frequency[],
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duration: Time | Time[],
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time?: Time,
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velocity?: NormalRange,
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): this {
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const computedTime = this.toSeconds(time);
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this.triggerAttack(notes, computedTime, velocity);
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if (isArray(duration)) {
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this.assert(isArray(notes), "If the duration is an array, the notes must also be an array");
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notes = notes as Frequency[];
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for (let i = 0; i < notes.length; i++) {
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const d = duration[Math.min(i, duration.length - 1)];
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const durationSeconds = this.toSeconds(d);
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this.assert(durationSeconds > 0, "The duration must be greater than 0");
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this.triggerRelease(notes[i], computedTime + durationSeconds);
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}
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} else {
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const durationSeconds = this.toSeconds(duration);
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this.assert(durationSeconds > 0, "The duration must be greater than 0");
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this.triggerRelease(notes, computedTime + durationSeconds);
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}
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return this;
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}
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/**
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* Sync the instrument to the Transport. All subsequent calls of
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* {@link triggerAttack} and {@link triggerRelease} will be scheduled along the transport.
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* @example
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* synth.sync()
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* //schedule 3 notes when the transport first starts
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* synth.triggerAttackRelease('8n', 0)
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* synth.triggerAttackRelease('8n', '8n')
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* synth.triggerAttackRelease('8n', '4n')
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* //start the transport to hear the notes
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* Transport.start()
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*/
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sync(): this {
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this._syncMethod("triggerAttack", 1);
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this._syncMethod("triggerRelease", 1);
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return this;
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}
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/**
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* Set a member/attribute of the voices
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* @example
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* poly.set({
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* "filter" : {
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* "type" : "highpass"
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* },
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* "envelope" : {
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* "attack" : 0.25
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* }
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* });
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*/
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set(options: RecursivePartial<VoiceOptions<Voice>>): this {
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this.options = deepMerge(this.options, options);
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this._voices.forEach(voice => voice.set(this.options));
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return this;
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}
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/**
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* Get the synth's attributes.
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*/
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get(): VoiceOptions<Voice> {
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// return a clone of the options
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return Object.assign({}, this.options);
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}
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/**
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* Trigger the release portion of all the currently active voices immediately.
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* Useful for silencing the synth.
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*/
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releaseAll(): this {
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const now = this.now();
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this._activeVoices.forEach(({ voice }) => {
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voice.triggerRelease(now);
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});
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this._activeVoices = [];
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return this;
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}
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dispose(): this {
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super.dispose();
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this._voices.forEach(v => v.dispose());
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this._activeVoices = [];
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this._availableVoices = [];
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this.context.clearInterval(this._gcTimeout);
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return this;
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}
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}
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