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<!DOCTYPE html>
<html lang="en">
<head>
<link rel="icon" type="image/x-icon" href="./favicon.ico" />
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta name="theme-color" content="#CCCCCC"/>
<meta property="og:image" content="/icon_maskable_192.png" />
<meta name="description" content="Unbox is a mod of UltraBox." />
<title>Unbox Sample Extractor</title>
<style>
:root {
--close-symbol: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="26" height="26" viewBox="-13 -13 26 26"><path fill="gray" d="M -7.07 -5.66 L -5.66 -7.07 L 0 -1.4 L 5.66 -7.07 L 7.07 -5.66 L 1.4 0 L 7.07 5.66 L 5.66 7.07 L 0 1.4 L -5.66 7.07 L -7.07 5.66 L -1.4 0 z"/></svg>');
}
html {
background: black;
overflow-x: hidden;
font-size: large;
font-family: sans-serif;
line-height: 1.3;
color: white;
}
body {
margin: auto;
overflow-x: hidden;
display: flex;
flex-direction: column;
align-items: center;
align-content: center;
}
main {
width: 100%;
max-width: 710px;
padding-left: 30px;
padding-right: 30px;
}
h1 {
font-size: 1.7rem;
text-align: center;
margin-top: 0.5em;
margin-bottom: 0.5em;
-webkit-text-stroke-width: 0;
}
h2 {
font-size: 1.5rem;
text-align: center;
margin-top: 0.5em;
margin-bottom: 0.5em;
-webkit-text-stroke-width: 0;
}
.accent-text {
color: #FF8EC5;
}
.center {
margin-left: auto;
margin-right: auto;
text-align: center;
}
a {
color: #98f;
}
button, input {
font-size: large;
}
.sample-list {
width: 100%;
padding: 1em;
font-size: large;
}
.welcome-area, .sample-list-area, .footer-area {
padding: 1em;
}
.sample-list-area .columns .column {
width: 100%;
}
.sample-list {
height: 30em;
}
.sample-list-collection-filename {
word-break: break-all;
}
.export-option-row {
display: flex;
flex-direction: column;
gap: 0.5em;
}
.output-sample-rate {
text-align: center;
}
aside {
font-size: small;
}
.overlay {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
background-color: rgba(0, 0, 0, 0.8);
display: flex;
justify-content: center;
align-items: center;
z-index: 1;
}
.prompt {
margin: auto;
text-align: center;
background: rgb(0, 0, 0);
border-radius: 15px;
border: 4px solid rgb(255, 255, 255);
padding: 20px;
display: flex;
flex-direction: column;
position: relative;
box-shadow: 5px 5px 20px 10px rgba(0, 0, 0, 0.5);
max-width: 600px;
box-sizing: border-box;
word-break: break-word;
}
.prompt .close-button {
float: right;
width: 26px;
height: 26px;
position: absolute;
top: 8px;
right: 8px;
margin: 0;
border: none;
border-radius: 5px;
background: #444;
color: inherit;
font-size: inherit;
font-family: inherit;
font-weight: inherit;
cursor: pointer;
}
.prompt .close-button::before {
content: "";
position: absolute;
width: 26px;
height: 26px;
left: 0;
top: 0;
pointer-events: none;
background: currentColor;
mask-image: var(--close-symbol);
mask-repeat: no-repeat;
mask-position: center;
-webkit-mask-image: var(--close-symbol);
-webkit-mask-repeat: no-repeat;
-webkit-mask-position: center;
}
.prompt h2 {
font-size: 2em;
margin: 0 16px;
font-weight: normal;
}
.prompt p {
text-align: left;
margin: 1em 0;
}
.prompt ul {
text-align: left;
}
/* wide screen */
@media (min-width: 711px) {
html {
width: 100%;
}
body {
width: 100%;
}
.sample-list-area .columns {
display: flex;
flex-direction: row;
align-content: center;
gap: 25px;
margin-bottom: 1em;
}
}
/* narrow screen */
@media (max-width: 710px) {
body {
width: 100%;
}
p {
margin: 1em 0.5em;
}
}
</style>
</head>
<body>
<main>
<div class="welcome-area">
<h1 class="accent-text">Sample Extractor</h1>
<p>This utility helps you take sounds from larger files with several sounds inside (such as <a href="https://en.wikipedia.org/wiki/SoundFont">soundfonts</a>, with their well-known <code>.sf2</code> file extension), and save them as individual <a href="https://en.wikipedia.org/wiki/WAV"><code>.wav</code></a> files, for use in your <a href="https://ultraabox.github.io">Unbox</a> songs.</p>
<p>To start, drop a file (in one of the <a class="supported-formats-link" href="#">supported formats</a>) on this page, or use your browser's file picker:</p>
<div class="center">
<input type="file" multiple id="file-picker">
</div>
<p>After downloading some samples, you can upload them to a file hosting service or web server. Some suggestions:</p>
<ul>
<li><a href="https://filegarden.com">File Garden</a></li>
<li><a href="https://www.dropbox.com">Dropbox</a> (domain needs to be <code>https://dl.dropboxusercontent.com</code>)</li>
<!-- <li><a href="https://neocities.org">Neocities</a></li> -->
<li><a href="https://pages.github.com">GitHub Pages</a></li>
<!-- <li><a href="https://docs.gitlab.com/ee/user/project/pages/">GitLab Pages</a></li> -->
<!-- <li><a href="https://support.atlassian.com/bitbucket-cloud/docs/publishing-a-website-on-bitbucket-cloud/">Bitbucket</a></li> -->
</ul>
</div>
<div class="sample-list-area" style="display: none;">
<h2 class="accent-text">Extracting from <code class="sample-list-collection-filename">filename.sf2</code></h2>
<p>Select a sample:</p>
<div class="columns">
<div class="column">
<select multiple class="sample-list" size="10"></select>
</div>
<div class="column">
<ul class="sample-info-container"></ul>
<div class="export-area">
<p class="export-option-row center">
<label>
<strong>Resample:</strong>
<input class="resample-box" type="checkbox">
</label>
</p>
<p class="export-option-row center output-sample-rate-row" style="display: none;">
<strong>Output sample rate:</strong>
<input class="output-sample-rate" type="number" value="44100" step="1">
</p>
<p class="export-option-row center">
<label>
<strong>Export samples with instrument name:</strong>
<input class="instrument-name-box" type="checkbox">
</label>
</p>
<ul class="center output-sample-info-container"></ul>
<p class="center">
<button class="play-note"></button>
<button class="export-as-wav">Export as .wav</button>
<button class="export-as-zip" style="display: none;">Export .wav files as .zip</button>
</p>
</div>
</div>
</div>
</div>
<div class="footer-area">
<details>
<summary>Changelog</summary>
<h3>v1.3.1</h3>
<ul>
<li>Updated documentation.</li>
</ul>
<h3>v1.3.0</h3>
<ul>
<li>Added loading support for .mp3/.ogg/.flac.</li>
</ul>
<h3>v1.2.0</h3>
<ul>
<li>Added the ability to export multiple samples into a .zip file. The sample list is <a href="https://developer.mozilla.org/en-US/docs/Web/HTML/Element/select">browser-dependent</a>, so how to select multiple items may vary, but on desktop browsers it should be a matter of clicking on samples while holding <code>Ctrl</code>, <code>Command</code>, or <code>Shift</code>.</li>
<li>Added an option to export samples with the instrument name, if available (thanks to nesquix for the initial implementation).</li>
</ul>
<h3>v1.1.0</h3>
<ul>
<li>Added the ability to load multiple .wav/.txt files at once.</li>
</ul>
<h3>v1.0.0</h3>
<ul>
<li>Initial release.</li>
</ul>
</details>
</div>
</main>
<section class="overlay" style="display: none;">
<div class="prompt">
<button class="close-button"></button>
<h2>Supported Formats</h2>
<ul>
<li>
<a href="https://en.wikipedia.org/wiki/SoundFont"><code>.sf2</code></a>
</li>
<li>
<code>.js</code>:
<a href="https://un-conventional.github.io">Unbox/a> built-in sample script<br>
Should also work with the sample scripts from <a href="https://paandorasbox.github.io">Pandora's Box</a>
</li>
<li>
<code>.txt</code>:
<a href="https://ultraabox.github.io/archives/thurmbox/pandoras-jummbox-40.html">Pandora's BeepBox</a> sample file<br>
You can see the sample list <a href="https://ultraabox.github.io/archives/thurmbox/sample_docs.html">here</a>.<br>
<!-- The sample URL format is <code>https://pandoras-box-archive.neptendo.repl.co/get_sample.php?sample_name=SAMPLE_NAME</code>. -->
</li>
<li>
<a href="https://en.wikipedia.org/wiki/WAV"><code>.wav</code></a>:
Loadable for convenience, in case resampling is needed. Loop points are also saved/loaded, so they can be consulted after exporting.
</li>
<li>
<a href="https://en.wikipedia.org/wiki/MP3"><code>.mp3</code></a>: Supported via the Web Audio API. Resampled to 44100hz on load. No loop point info.
</li>
<li>
<a href="https://en.wikipedia.org/wiki/Ogg"><code>.ogg</code></a>: Supported via the Web Audio API. Resampled to 44100hz on load. No loop point info.
</li>
<li>
<a href="https://en.wikipedia.org/wiki/FLAC"><code>.flac</code></a>: Supported via the Web Audio API. Resampled to 44100hz on load. No loop point info.
</li>
</ul>
</div>
</section>
<script src="https://cdn.jsdelivr.net/npm/wavefile@11.0.0/dist/wavefile.js"></script>
<script src="https://cdn.jsdelivr.net/npm/fflate@0.8.0/umd/index.js"></script>
<script>
// https://cdn.jsdelivr.net/npm/@logue/sf2synth@latest/dist/sf2synth.umd.js
// Modified slightly to not error on SoundFont 2.04 files (though the 24-bit samples
// aren't handled correctly (yet)).
/**
* @logue/sf2synth
*
* @description SoundFont2 Synthesizer
* @author iyama, Logue
* @license MIT
* @version 0.5.7
* @see {@link https://github.com/logue/sf2synth.js}
*/
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
typeof define === 'function' && define.amd ? define(factory) :
(global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.SoundFont = factory());
})(this, (function () { 'use strict';
/**
* SynthesizerNote Class
*
* @author imaya
* @private
*/
class SynthesizerNote {
/**
* @param {AudioContext} ctx
* @param {AudioNode} destination
* @param {{
* channel: number;
* key: number;
* sample: Uint8Array;
* basePlaybackRate: number;
* loopStart: number;
* loopEnd: number;
* volume: number;
* panpot: number;
* }} instrument
*/
constructor(ctx, destination, instrument) {
/** @type {AudioContext} */
this.ctx = ctx;
/** @type {AudioNode} */
this.destination = destination;
/**
* @type {{
* channel: number;
* key: number;
* sample: Uint8Array;
* basePlaybackRate: number;
* loopStart: number;
* loopEnd: number;
* volume: number;
* panpot: number;
* }}
*/
this.instrument = instrument;
/** @type {number} */
this.channel = instrument['channel'];
/** @type {number} */
this.key = instrument['key'];
/** @type {number} */
this.velocity = instrument['velocity'];
/** @type {Uint8Array} */
this.buffer = instrument['sample'];
/** @type {number} */
this.playbackRate = instrument['basePlaybackRate'];
/** @type {number} */
this.loopStart = instrument['loopStart'];
/** @type {number} */
this.loopEnd = instrument['loopEnd'];
/** @type {number} */
this.sampleRate = instrument['sampleRate'];
/** @type {number} */
this.volume = instrument['volume'];
/** @type {number} */
this.panpot = instrument['panpot'];
/** @type {number} */
this.pitchBend = instrument['pitchBend'];
/** @type {number} */
this.pitchBendSensitivity = instrument['pitchBendSensitivity'];
/** @type {number} */
this.modEnvToPitch = instrument['modEnvToPitch'];
/** @type {number} */
this.expression = instrument['expression'];
/** @type {number} */
this.modulation = instrument['modulation'];
/** @type {number} */
this.cutOffFrequency = instrument['cutOffFrequency'];
/** @type {number} */
this.hermonicContent = instrument['hermonicContent'];
/** @type {import('@logue/reverb').default} */
this.reverb = instrument['reverb'];
// state
/** @type {number} */
this.startTime = ctx.currentTime;
/** @type {number} */
this.computedPlaybackRate = this.playbackRate | 0;
/** @type {boolean} */
this.noteOffState = false;
// ---------------------------------------------------------------------------
// audio node
// ---------------------------------------------------------------------------
/** @type {AudioBuffer} */
this.audioBuffer = null;
/** @type {AudioBufferSourceNode} */
this.bufferSource = ctx.createBufferSource();
/** @type {PannerNode} */
this.panner = ctx.createPanner();
/** @type {GainNode} */
this.outputGainNode = ctx.createGain();
/** @type {GainNode} */
this.expressionGainNode = ctx.createGain();
/** @type {BiquadFilterNode} */
this.filter = ctx.createBiquadFilter();
/** @type {BiquadFilterNode} */
this.modulator = ctx.createBiquadFilter();
}
/** Note on */
noteOn() {
/** @type {AudioContext} */
const ctx = this.ctx;
/**
* @type {{
* channel: number;
* key: number;
* sample: Uint8Array;
* basePlaybackRate: number;
* loopStart: number;
* loopEnd: number;
* volume: number;
* panpot: number;
* }}
*/
const instrument = this.instrument;
/** @type {number} */
const now = this.ctx.currentTime || 0;
/** @type {number} */
const volDelay = now + instrument['volDelay'];
/** @type {number} */
const modDelay = now + instrument['modDelay'];
/** @type {number} */
const volAttack = volDelay + instrument['volAttack'];
/** @type {number} */
const modAttack = volDelay + instrument['modAttack'];
/** @type {number} */
const volHold = volAttack + instrument['volHold'];
/** @type {number} */
const modHold = modAttack + instrument['modHold'];
/** @type {number} */
const volDecay = volHold + instrument['volDecay'];
/** @type {number} */
const modDecay = modHold + instrument['modDecay'];
/** @type {number} */
const loopStart = instrument['loopStart'] / this.sampleRate;
/** @type {number} */
const loopEnd = instrument['loopEnd'] / this.sampleRate;
/** @type {number} */
const startTime = instrument['start'] / this.sampleRate;
// TODO: ドラムパートのPanが変化した場合、その計算をしなければならない
// http://cpansearch.perl.org/src/PJB/MIDI-SoundFont-1.08/doc/sfspec21.html#8.4.6
/** @type {number} */
const pan = instrument['pan'] !== 0 ? instrument['pan'] : this.panpot;
const sample = this.buffer.subarray(
0,
this.buffer.length + instrument['end']
);
/** @type {AudioBuffer} */
const buffer = (this.audioBuffer = ctx.createBuffer(
1,
sample.length,
this.sampleRate
));
/** @type {Float32Array} */
const channelData = buffer.getChannelData(0);
channelData.set(sample);
// buffer source
/** @type {AudioBufferSourceNode} */
const bufferSource = this.bufferSource;
bufferSource.buffer = buffer;
bufferSource.loop = instrument['sampleModes'] || 0;
bufferSource.loopStart = loopStart;
bufferSource.loopEnd = loopEnd;
this.updatePitchBend(this.pitchBend);
// Output
/** @type {GainNode} */
const output = this.outputGainNode;
// expression
this.expressionGainNode.gain.value = this.expression / 127;
// panpot
/** @type {PannerNode} */
const panner = this.panner;
panner.panningModel = 'equalpower';
panner.distanceModel = 'inverse';
panner.positionX.setValueAtTime(Math.sin((pan * Math.PI) / 2), 0);
panner.positionY.setValueAtTime(0, 0);
panner.positionZ.setValueAtTime(Math.cos((pan * Math.PI) / 2), 0);
// ---------------------------------------------------------------------------
// Delay, Attack, Hold, Decay, Sustain
// ---------------------------------------------------------------------------
/** @type {number} */
let volume =
this.volume *
(this.velocity / 127) *
(1 - instrument['initialAttenuation'] / 1000);
if (volume < 0) {
volume = 0;
}
/** @type {AudioParam} volume envelope */
const outputGain = output.gain;
outputGain.setValueAtTime(0, now);
outputGain.setValueAtTime(0, volDelay);
outputGain.setTargetAtTime(volume, volDelay, instrument['volAttack']);
outputGain.setValueAtTime(volume, volHold);
outputGain.linearRampToValueAtTime(
volume * (1 - instrument['volSustain']),
volDecay
);
// modulation envelope
/** @type {number} */
const baseFreq = instrument['initialFilterFc'];
/** @type {number} */
const peekFreq =
instrument['initialFilterFc'] + instrument['modEnvToFilterFc'];
/** @type {number} */
const sustainFreq =
baseFreq + (peekFreq - baseFreq) * (1 - instrument['modSustain']);
/** @type {BiquadFilterNode} */
const modulator = this.modulator;
modulator.Q.setValueAtTime(10 ** (instrument['initialFilterQ'] / 200), now);
modulator.frequency.value = baseFreq;
modulator.type = 'lowpass';
modulator.frequency.setTargetAtTime(
baseFreq / 127,
this.ctx.currentTime,
0.5
);
modulator.frequency.setValueAtTime(baseFreq, now);
modulator.frequency.setValueAtTime(baseFreq, modDelay);
modulator.frequency.setTargetAtTime(
peekFreq,
modDelay,
parseFloat(instrument['modAttack'])
);
modulator.frequency.setValueAtTime(peekFreq, modHold);
modulator.frequency.exponentialRampToValueAtTime(sustainFreq, modDecay);
// Vibrato
/* * @type {GainNode} LFO Depth * /
const lfoDepth = this.ctx.createGain();
/* * @type {OscillatorNode} LFO Oscillator * /
const lfo = this.ctx.createOscillator();
// Set parameters for LFO
lfo.type = 'sine';
lfoDepth.gain.value = 1;
lfo.frequency.value = this.instrument['freqVibLFO'];
if (this.modulation) {
// Effector (Vibrato) ON
lfo.start(0);
} else {
// Effector (Vibrato) Off
lfo.stop(0);
}
// OscillatorNode (LFO) -> GainNode (Depth) -> frequency (AudioParam)
lfo.connect(lfoDepth);
// connect
bufferSource.connect(lfoDepth);
lfoDepth.connect(modulator);
modulator.connect(panner);
panner.connect(this.expressionGainNode);
*/
bufferSource.connect(modulator);
modulator.connect(panner);
panner.connect(this.expressionGainNode);
if (!instrument['mute']) {
this.connect();
}
this.expressionGainNode.connect(output);
// fire
bufferSource.start(0, startTime);
}
/**
* @param {number} val
* @return {number}
*/
amountToFreq(val) {
return 2 ** ((val - 6900) / 1200) * 440;
}
/** Note off */
noteOff() {
this.noteOffState = true;
}
/** @return {boolean} */
isNoteOff() {
return this.noteOffState;
}
/** @return {void} */
release() {
/**
* @type {{
* channel: number;
* key: number;
* sample: Uint8Array;
* basePlaybackRate: number;
* loopStart: number;
* loopEnd: number;
* volume: number;
* panpot: number;
* }}
*/
const instrument = this.instrument;
/** @type {AudioBufferSourceNode} */
const bufferSource = this.bufferSource;
/** @type {GainNode} */
const output = this.outputGainNode;
/** @type {number} */
const now = this.ctx.currentTime;
/** @type {number} */
const release = instrument['releaseTime'] - 64;
// ---------------------------------------------------------------------------
// volume release time
// ---------------------------------------------------------------------------
/** @type {number} */
const volEndTimeTmp = instrument['volRelease'] * output.gain.value;
/** @type {number} */
const volEndTime =
now + volEndTimeTmp * (1 + release / (release < 0 ? 64 : 63));
// now + instrument['volRelease'] * (1 - instrument['volSustain']);
// ---------------------------------------------------------------------------
// modulation release time
// ---------------------------------------------------------------------------
/** @type {BiquadFilterNode} */
const modulator = this.modulator;
/** @type {number} */
const baseFreq = instrument['initialFilterFc'];
/** @type {number} */
const peekFreq =
instrument['initialFilterFc'] + instrument['modEnvToFilterFc'];
/** @type {number} */
const modEndTime =
now +
instrument['modRelease'] *
(baseFreq === peekFreq
? 1
: (modulator.frequency.value - baseFreq) / (peekFreq - baseFreq));
// const modEndTime =
// now + instrument['modRelease'] * (1 - instrument['modSustain']);
if (!this.audioBuffer) {
return;
}
// ---------------------------------------------------------------------------
// Release
// ---------------------------------------------------------------------------
switch (instrument['sampleModes']) {
case 0:
// ループしない
bufferSource.loop = false;
break;
case 1:
// ループさせる
output.gain.cancelScheduledValues(0);
output.gain.setValueAtTime(output.gain.value, now);
output.gain.linearRampToValueAtTime(0, volEndTime);
modulator.frequency.cancelScheduledValues(0);
modulator.frequency.setValueAtTime(modulator.frequency.value, now);
modulator.frequency.exponentialRampToValueAtTime(baseFreq, modEndTime);
bufferSource.playbackRate.cancelScheduledValues(0);
bufferSource.playbackRate.setValueAtTime(
bufferSource.playbackRate.value,
now
);
bufferSource.playbackRate.exponentialRampToValueAtTime(
this.computedPlaybackRate,
modEndTime
);
bufferSource.stop(volEndTime);
break;
case 2:
// 未定義
throw Error('[SynthesizerNote] Detect unused sampleModes');
case 3:
// ノートオフまでループさせる
output.gain.cancelScheduledValues(0);
output.gain.setValueAtTime(output.gain.value, now);
output.gain.linearRampToValueAtTime(0, volEndTime);
modulator.frequency.cancelScheduledValues(0);
modulator.frequency.setValueAtTime(modulator.frequency.value, now);
modulator.frequency.exponentialRampToValueAtTime(baseFreq, modEndTime);
bufferSource.playbackRate.cancelScheduledValues(0);
bufferSource.playbackRate.setValueAtTime(
bufferSource.playbackRate.value,
now
);
bufferSource.playbackRate.exponentialRampToValueAtTime(
this.computedPlaybackRate,
modEndTime
);
bufferSource.loop = false;
bufferSource.buffer = null;
break;
default:
throw Error(
`[SynthesizerNote] ${instrument['sampleModes']} is undefined sampleModes.`
);
}
}
/** Connect AudioContext */
connect() {
this.reverb.connect(this.outputGainNode).connect(this.destination);
}
/** Disconnect AudioContext */
disconnect() {
this.outputGainNode.disconnect(0);
}
/** Caluclate playback rate */
schedulePlaybackRate() {
/** @type {AudioParam} */
const playbackRate = this.bufferSource.playbackRate;
/** @type {number} */
const computed = this.computedPlaybackRate;
/** @type {number} */
const start = this.startTime;
/** @type {Object} */
const instrument = this.instrument;
/** @type {number} */
const modAttack = start + instrument['modAttack'];
/** @type {number} */
const modDecay = modAttack + instrument['modDecay'];
/** @type {number} */
const peekPitch =
computed *
1.0594630943592953 ** // Math.pow(2, 1 / 12)
(this.modEnvToPitch * this.instrument['scaleTuning']);
playbackRate.cancelScheduledValues(0);
playbackRate.setValueAtTime(computed, start);
playbackRate.linearRampToValueAtTime(peekPitch, modAttack);
playbackRate.linearRampToValueAtTime(
computed + (peekPitch - computed) * (1 - instrument['modSustain']),
modDecay
);
}
/** @param {number} expression */
updateExpression(expression) {
this.expressionGainNode.gain.value = (this.expression = expression) / 127;
}
/** @param {number} pitchBend */
updatePitchBend(pitchBend) {
this.computedPlaybackRate =
this.playbackRate *
1.0594630943592953 ** // Math.pow(2, 1 / 12)
((pitchBend / (pitchBend < 0 ? 8192 : 8191)) *
this.pitchBendSensitivity *
this.instrument['scaleTuning']);
this.schedulePlaybackRate();
}
}
const INV_MAX = 1 / 2 ** 32;
class ARandom {
float(norm = 1) {
return this.int() * INV_MAX * norm;
}
norm(norm = 1) {
return (this.int() * INV_MAX - 0.5) * 2 * norm;
}
normMinMax(min, max) {
const x = this.minmax(min, max);
return this.float() < 0.5 ? x : -x;
}
minmax(min, max) {
return this.float() * (max - min) + min;
}
minmaxInt(min, max) {
min |= 0;
max |= 0;
return min + ((this.float() * (max - min)) | 0);
}
}
const random = Math.random;
/**
* A `Math.random()` based {@link IRandom} implementation. Also @see
* {@link SYSTEM}.
*/
class SystemRandom extends ARandom {
int() {
return (random() * 4294967296) /* 2**32 */ >>> 0;
}
float(norm = 1) {
return random() * norm;
}
norm(norm = 1) {
return (random() - 0.5) * 2 * norm;
}
}
/**
* Used as default PRNG throughout most other thi.ng projects, though usually is
* configurable.
*/
const SYSTEM = new SystemRandom();
const DEFAULT_OPTS = {
bins: 2,
scale: 1,
rnd: SYSTEM,
};
const preseed = (n, scale, rnd) => {
const state = new Array(n);
for (let i = 0; i < n; i++) {
state[i] = rnd.norm(scale);
}
return state;
};
const sum = (src) => src.reduce((sum, x) => sum + x, 0);
function* interleave(a, b) {
const src = [a[Symbol.iterator](), b[Symbol.iterator]()];
for (let i = 0; true; i ^= 1) {
const next = src[i].next();
if (next.done)
return;
yield next.value;
}
}
/**
* High-pass filtered noise. Opposite of {@link red}.
*
* @param opts -
*/
function* blue(opts) {
const { bins, scale, rnd } = {
...DEFAULT_OPTS,
...opts,
};
const state = preseed(bins, scale, rnd);
state.forEach((x, i) => (state[i] = i & 1 ? x : -x));
const invN = 1 / bins;
let acc = sum(state);
for (let i = 0, sign = -1; true; ++i >= bins && (i = 0)) {
acc -= state[i];
acc += state[i] = sign * rnd.norm(scale);
sign ^= 0xfffffffe;
yield sign * acc * invN;
}
}
/**
* Band-pass filtered noise (interleaved blue noise). Opposite of
* {@link violet}.
*
* @param opts -
*/
const green = (opts) => interleave(blue(opts), blue(opts));
/**
* Returns number of 1 bits in `x`.
*
* @param x -
*/
const ctz32 = (x) => {
let c = 32;
x &= -x;
x && c--;
x & 0x0000ffff && (c -= 16);
x & 0x00ff00ff && (c -= 8);
x & 0x0f0f0f0f && (c -= 4);
x & 0x33333333 && (c -= 2);
x & 0x55555555 && (c -= 1);
return c;
};
/**
* Exponential decay (1/f) noise, based on Voss-McCarthy algorithm.
*
* @remarks
* The number of internal states should be in the [4..32] range (default: 8).
* Due to JS integer limitations, `n` > 32 are meaningless.
*
* References:
*
* - https://www.dsprelated.com/showarticle/908.php
* - https://www.firstpr.com.au/dsp/pink-noise/#Voss-McCartney
*
* @param opts -
*/
function* pink(opts) {
const { bins, scale, rnd } = {
...DEFAULT_OPTS,
bins: 8,
...opts,
};
const state = preseed(bins, scale, rnd);
const invN = 1 / bins;
let acc = sum(state);
for (let i = 0; true; i = (i + 1) >>> 0) {
const id = ctz32(i) % bins;
acc -= state[id];
acc += state[id] = rnd.norm(scale);
yield acc * invN;
}
}
/**
* Low-pass filtered noise (same as brown noise). Opposite of {@link blue}.
*
* @param opts -
*/
function* red(opts) {
const { bins, scale, rnd } = {
...DEFAULT_OPTS,
...opts,
};
const state = preseed(bins, scale, rnd);
const invN = 1 / bins;
let acc = sum(state);
for (let i = 0; true; ++i >= bins && (i = 0)) {
acc -= state[i];