mirror of
https://github.com/Tonejs/Tone.js
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323 lines
10 KiB
TypeScript
323 lines
10 KiB
TypeScript
import { ToneAudioBuffer } from "../core/context/ToneAudioBuffer";
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import { ToneAudioBuffers } from "../core/context/ToneAudioBuffers";
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import { intervalToFrequencyRatio } from "../core/type/Conversions";
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import { FrequencyClass } from "../core/type/Frequency";
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import { Frequency, Interval, MidiNote, NormalRange, Note, Time } from "../core/type/Units";
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import { optionsFromArguments } from "../core/util/Defaults";
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import { noOp } from "../core/util/Interface";
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import { isArray, isNote, isNumber } from "../core/util/TypeCheck";
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import { Instrument, InstrumentOptions } from "../instrument/Instrument";
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import { ToneBufferSource, ToneBufferSourceCurve } from "../source/buffer/ToneBufferSource";
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interface SamplesMap {
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[note: string]: ToneAudioBuffer | AudioBuffer | string;
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[midi: number]: ToneAudioBuffer | AudioBuffer | string;
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}
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export interface SamplerOptions extends InstrumentOptions {
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attack: Time;
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release: Time;
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onload: () => void;
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baseUrl: string;
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curve: ToneBufferSourceCurve;
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urls: SamplesMap;
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}
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/**
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* Pass in an object which maps the note's pitch or midi value to the url,
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* then you can trigger the attack and release of that note like other instruments.
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* By automatically repitching the samples, it is possible to play pitches which
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* were not explicitly included which can save loading time.
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*
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* For sample or buffer playback where repitching is not necessary,
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* use [[Player]].
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* @example
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* var sampler = new Sampler({
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* "C3" : "path/to/C3.mp3",
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* "D#3" : "path/to/Dsharp3.mp3",
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* "F#3" : "path/to/Fsharp3.mp3",
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* "A3" : "path/to/A3.mp3",
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* }, function(){
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* //sampler will repitch the closest sample
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* sampler.triggerAttack("D3")
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* })
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* @category Instrument
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*/
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export class Sampler extends Instrument<SamplerOptions> {
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readonly name: string = "Sampler";
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/**
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* The stored and loaded buffers
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*/
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private _buffers: ToneAudioBuffers;
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/**
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* The object of all currently playing BufferSources
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*/
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private _activeSources: Map<MidiNote, ToneBufferSource[]> = new Map();
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/**
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* The envelope applied to the beginning of the sample.
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*/
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attack: Time;
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/**
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* The envelope applied to the end of the envelope.
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*/
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release: Time;
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/**
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* The shape of the attack/release curve.
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* Either "linear" or "exponential"
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*/
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curve: ToneBufferSourceCurve;
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/**
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* @param samples An object of samples mapping either Midi Note Numbers or
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* Scientific Pitch Notation to the url of that sample.
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* @param onload The callback to invoke when all of the samples are loaded.
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* @param baseUrl The root URL of all of the samples, which is prepended to all the URLs.
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*/
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constructor(samples?: SamplesMap, onload?: () => void, baseUrl?: string);
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/**
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* @param samples An object of samples mapping either Midi Note Numbers or
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* Scientific Pitch Notation to the url of that sample.
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* @param options The remaining options associated with the sampler
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*/
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constructor(samples?: SamplesMap, options?: Partial<Omit<SamplerOptions, "urls">>);
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constructor(options?: Partial<SamplerOptions>);
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constructor() {
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super(optionsFromArguments(Sampler.getDefaults(), arguments, ["urls", "onload", "baseUrl"], "urls"));
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const options = optionsFromArguments(Sampler.getDefaults(), arguments, ["urls", "onload", "baseUrl"], "urls");
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const urlMap = {};
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Object.keys(options.urls).forEach((note) => {
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const noteNumber = parseInt(note, 10);
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this.assert(isNote(note)
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|| (isNumber(noteNumber) && isFinite(noteNumber)), `url key is neither a note or midi pitch: ${note}`);
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if (isNote(note)) {
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// convert the note name to MIDI
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const mid = new FrequencyClass(this.context, note).toMidi();
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urlMap[mid] = options.urls[note];
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} else if (isNumber(noteNumber) && isFinite(noteNumber)) {
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// otherwise if it's numbers assume it's midi
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urlMap[noteNumber] = options.urls[noteNumber];
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}
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});
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this._buffers = new ToneAudioBuffers(urlMap, options.onload, options.baseUrl);
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this.attack = options.attack;
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this.release = options.release;
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this.curve = options.curve;
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// invoke the callback if it's already loaded
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if (this._buffers.loaded) {
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// invoke onload deferred
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Promise.resolve().then(options.onload);
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}
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}
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static getDefaults(): SamplerOptions {
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return Object.assign(Instrument.getDefaults(), {
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attack: 0,
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baseUrl: "",
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curve: "exponential" as "exponential",
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onload: noOp,
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release: 0.1,
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urls: {},
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});
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}
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/**
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* Returns the difference in steps between the given midi note at the closets sample.
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*/
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private _findClosest(midi: MidiNote): Interval {
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// searches within 8 octaves of the given midi note
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const MAX_INTERVAL = 96;
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let interval = 0;
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while (interval < MAX_INTERVAL) {
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// check above and below
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if (this._buffers.has(midi + interval)) {
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return -interval;
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} else if (this._buffers.has(midi - interval)) {
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return interval;
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}
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interval++;
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}
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throw new Error(`No available buffers for note: ${midi}`);
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}
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/**
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* @param notes The note to play, or an array of notes.
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* @param time When to play the note
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* @param velocity The velocity to play the sample back.
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*/
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triggerAttack(notes: Frequency | Frequency[], time?: Time, velocity: NormalRange = 1): this {
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this.log("triggerAttack", notes, time, velocity);
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if (!Array.isArray(notes)) {
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notes = [notes];
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}
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notes.forEach(note => {
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const midi = new FrequencyClass(this.context, note).toMidi();
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// find the closest note pitch
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const difference = this._findClosest(midi);
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const closestNote = midi - difference;
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const buffer = this._buffers.get(closestNote);
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const playbackRate = intervalToFrequencyRatio(difference);
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// play that note
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const source = new ToneBufferSource({
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buffer,
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context: this.context,
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curve: this.curve,
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fadeIn: this.attack,
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fadeOut: this.release,
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playbackRate,
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}).connect(this.output);
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source.start(time, 0, buffer.duration / playbackRate, velocity);
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// add it to the active sources
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if (!isArray(this._activeSources.get(midi))) {
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this._activeSources.set(midi, []);
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}
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(this._activeSources.get(midi) as ToneBufferSource[]).push(source);
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// remove it when it's done
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source.onended = () => {
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if (this._activeSources && this._activeSources.has(midi)) {
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const sources = this._activeSources.get(midi) as ToneBufferSource[];
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const index = sources.indexOf(source);
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if (index !== -1) {
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sources.splice(index, 1);
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}
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}
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};
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});
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return this;
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}
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/**
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* @param notes The note to release, or an array of notes.
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* @param time When to release the note.
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*/
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triggerRelease(notes: Frequency | Frequency[], time?: Time): this {
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this.log("triggerRelease", notes, time);
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if (!Array.isArray(notes)) {
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notes = [notes];
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}
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notes.forEach(note => {
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const midi = new FrequencyClass(this.context, note).toMidi();
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// find the note
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if (this._activeSources.has(midi) && (this._activeSources.get(midi) as ToneBufferSource[]).length) {
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const sources = this._activeSources.get(midi) as ToneBufferSource[];
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time = this.toSeconds(time);
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sources.forEach(source => {
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source.stop(time);
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});
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this._activeSources.set(midi, []);
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}
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});
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return this;
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}
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/**
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* Release all currently active notes.
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* @param time When to release the notes.
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*/
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releaseAll(time?: Time): this {
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const computedTime = this.toSeconds(time);
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this._activeSources.forEach(sources => {
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while (sources.length) {
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const source = sources.shift() as ToneBufferSource;
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source.stop(computedTime);
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}
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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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* [[triggerAttack]] and [[triggerRelease]]
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* 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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* @returns {Tone.Instrument} this
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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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* Invoke the attack phase, then after the duration, invoke the release.
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* @param notes The note to play and release, or an array of notes.
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* @param duration The time the note should be held
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* @param time When to start the attack
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* @param velocity The velocity of the attack
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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 = 1,
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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), "notes must be an array when duration is array");
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(notes as Frequency[]).forEach((note, index) => {
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const d = duration[Math.min(index, duration.length - 1)];
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this.triggerRelease(note, computedTime + this.toSeconds(d));
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});
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} else {
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this.triggerRelease(notes, computedTime + this.toSeconds(duration));
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}
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return this;
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}
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/**
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* Add a note to the sampler.
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* @param note The buffer's pitch.
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* @param url Either the url of the buffer, or a buffer which will be added with the given name.
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* @param callback The callback to invoke when the url is loaded.
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*/
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add(note: Note | MidiNote, url: string | ToneAudioBuffer | AudioBuffer, callback?: () => void): this {
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this.assert(isNote(note) || isFinite(note), `note must be a pitch or midi: ${note}`);
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if (isNote(note)) {
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// convert the note name to MIDI
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const mid = new FrequencyClass(this.context, note).toMidi();
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this._buffers.add(mid, url, callback);
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} else {
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// otherwise if it's numbers assume it's midi
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this._buffers.add(note, url, callback);
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}
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return this;
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}
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/**
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* If the buffers are loaded or not
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*/
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get loaded(): boolean {
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return this._buffers.loaded;
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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._buffers.dispose();
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this._activeSources.forEach(sources => {
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sources.forEach(source => source.dispose());
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});
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this._activeSources.clear();
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return this;
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}
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}
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