Start trying to do some PWA action
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@ -9,6 +9,9 @@
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<link rel="icon" type="image/png" href="{{ '/assets/images/face.png' | relative_url }}">
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{% if page.scripts %}{% for js_file in page.scripts %}
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<script src="{{ js_file }}"></script>
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{% endfor %}{% endif %}
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{% if page.headers %}{% for header in page.headers %}
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{{ header }}
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{% endfor %}{% endif %}
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<title>{{ page.title }}</title>
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</head>
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@ -37,6 +40,7 @@
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<ul>
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<li><a href="https://github.com/nealey/">GitHub</a></li>
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<li><a href="mailto:neale@woozle.org">Email</a></li>
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</ul>
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</nav>
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</footer>
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@ -14,18 +14,19 @@ body {
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padding: 1em;
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border-radius: 1em;
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max-width: 35em;
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font-family: "Roboto", sans-serif;
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font-family: "Lato", "Roboto", sans-serif;
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}
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#title, td.main {
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background-color: #e0e4cc;
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border-radius: 0.5em;
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padding: 0em 1em;
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border-radius: 0.25em;
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padding: 0.1em 0.5em;
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margin-top: 0;
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box-shadow: 0.2em 0.2em 1em rgba(0,0,0,0.1);
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}
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h1, h2, h3, h4, h5, h6 {
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color: #fa6900;
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color: #e64;
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}
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a {
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@ -117,3 +118,11 @@ pre {
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font-size: small;
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text-indent: inherit;
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}
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button.big {
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padding: 0;
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border: 0;
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margin: 1em;
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font-size: 2em;
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background: inherit;
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}
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@ -1,13 +1,9 @@
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<!DOCTYPE html>
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<html lang="en-US">
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<head>
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<meta charset='utf-8'>
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<meta name="viewport" content="width=device-width">
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<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:regular,bold,italic">
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<link rel="stylesheet" media="screen" href="/assets/css/default.css">
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<link rel="icon" href="icon.svg">
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<link rel="manifest" href="manifest.webmanifest">
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<style>
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---
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title: Starship Noise Generator
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scripts:
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- starship.js
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---
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#play {
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padding: 0;
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border: 0;
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@ -15,97 +11,23 @@
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font-size: 2em;
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background: inherit;
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}
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</style>
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<div>
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<button id="play">⏯️</button>
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🔉
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<input id="fader" type="range" min="0" max="10" step="0.01" />
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🔊
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</div>
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<title>Starship Noise Generator</title>
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<script>
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function whiteNoise(audioCtx) {
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var bufferSize = 17 * audioCtx.sampleRate,
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noiseBuffer = audioCtx.createBuffer(1, bufferSize, audioCtx.sampleRate),
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output = noiseBuffer.getChannelData(0);
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for (var i = 0; i < bufferSize; i++) {
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output[i] = Math.random() * 2 - 1;
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}
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var whiteNoise = audioCtx.createBufferSource();
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whiteNoise.buffer = noiseBuffer;
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whiteNoise.loop = true;
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whiteNoise.start(0);
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return whiteNoise;
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}
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I work in a building with no HVAC,
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which means we can hear <em>everything</em> people are saying,
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anywhere in the building.
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function bandpassFilter(audioCtx, freq, gain) {
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var filt = audioCtx.createBiquadFilter();
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filt.type = "bandpass";
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filt.frequency.value = freq;
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filt.gain.value = gain;
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return filt;
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}
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function init() {
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var audioCtx = new window.AudioContext();
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var synth = whiteNoise(audioCtx);
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var filterA = bandpassFilter(audioCtx, 100, 20);
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var filterB = bandpassFilter(audioCtx, 50, 20);
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var gainA = audioCtx.createGain();
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whiteNoise(audioCtx).connect(filterA);
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filterA.connect(filterB);
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filterB.connect(gainA);
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gainA.connect(audioCtx.destination);
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audioCtx.suspend();
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function setFade() {
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var faderPos = document.querySelector("#fader").value;
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gainA.gain.value = faderPos;
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}
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document.querySelector("#fader").addEventListener("input", setFade);
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setFade();
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document.querySelector("#play").addEventListener("click", e => {
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console.log(audioCtx.state);
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if (audioCtx.state == 'running') {
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audioCtx.suspend();
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} else {
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audioCtx.resume();
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}
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});
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}
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if (document.readyState === "loading") {
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document.addEventListener("DOMContentLoaded", init);
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} else {
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init();
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}
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</script>
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</head>
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<body>
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<h1 id="title">
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<span>Starship Noise Generator</span>
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</h1>
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<main id="content">
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<div>
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<button id="play">⏯️</button>
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🔉
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<input id="fader" type="range" min="0" max="10" step="0.01" />
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🔊
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</div>
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<p>I work in a building with no HVAC,
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which means we can hear <em>everything</em> people are saying,
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anywhere in the building.</p>
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<p>This page is a low-CPU noise generator that runs entirely in JavaScript.
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Once it starts,
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you don’t need an Internet connection to keep it going.
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You can leave it running forever, if you like.</p>
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<p>For those interested,
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it uses the new (in 2017) and seriously perfect for this application
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<a href="https://developer.mozilla.org/en-US/docs/Web/API/Web_Audio_API">Web Audio API</a>.</p>
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</main>
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</body>
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</html>
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This page is a low-CPU noise generator that runs entirely in JavaScript.
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Once it starts,
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you don’t need an Internet connection to keep it going.
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You can leave it running forever, if you like.
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For those interested,
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it uses the new (in 2017) and seriously perfect for this application
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[Web Audio API](https://developer.mozilla.org/en-US/docs/Web/API/Web_Audio_API)
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@ -0,0 +1,15 @@
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{
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"name": "Starship Noise Generator",
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"short_name": "Starship",
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"start_url": ".",
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"display": "standalone",
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"background_color": "#fff",
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"description": "Generates brown noise similar to a futuristic starship engine (or a modern HVAC system)",
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"icons": [
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{
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"src": "icon.svg",
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"sizes": "any"
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}
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]
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}
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@ -0,0 +1,62 @@
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function whiteNoise(audioCtx) {
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var bufferSize = 17 * audioCtx.sampleRate,
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noiseBuffer = audioCtx.createBuffer(1, bufferSize, audioCtx.sampleRate),
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output = noiseBuffer.getChannelData(0);
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for (var i = 0; i < bufferSize; i++) {
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output[i] = Math.random() * 2 - 1;
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}
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var whiteNoise = audioCtx.createBufferSource();
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whiteNoise.buffer = noiseBuffer;
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whiteNoise.loop = true;
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whiteNoise.start(0);
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return whiteNoise;
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}
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function bandpassFilter(audioCtx, freq, gain) {
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var filt = audioCtx.createBiquadFilter();
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filt.type = "bandpass";
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filt.frequency.value = freq;
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filt.gain.value = gain;
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return filt;
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}
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function init() {
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var audioCtx = new window.AudioContext();
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var synth = whiteNoise(audioCtx);
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var filterA = bandpassFilter(audioCtx, 100, 20);
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var filterB = bandpassFilter(audioCtx, 50, 20);
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var gainA = audioCtx.createGain();
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whiteNoise(audioCtx).connect(filterA);
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filterA.connect(filterB);
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filterB.connect(gainA);
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gainA.connect(audioCtx.destination);
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audioCtx.suspend();
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function setFade() {
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var faderPos = document.querySelector("#fader").value;
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gainA.gain.value = faderPos;
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}
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document.querySelector("#fader").addEventListener("input", setFade);
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setFade();
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document.querySelector("#play").addEventListener("click", e => {
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if (audioCtx.state == "running") {
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audioCtx.suspend();
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} else {
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audioCtx.resume();
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}
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});
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console.log(navigator.serviceWorker);
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console.log("moo");
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if ("serviceWorker" in navigator) {
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navigator.serviceWorker.register("sw.js");
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}
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}
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if (document.readyState === "loading") {
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document.addEventListener("DOMContentLoaded", init);
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} else {
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init();
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}
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@ -0,0 +1,26 @@
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var cacheName = "starship-v1";
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var content = [
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"index.html",
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"starship.js"
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];
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self.addEventListener("install", e => {
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e.waitUntil(caches.Open(cacheName).then(cache => cache.addAll(content)));
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});
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// Have mercy, this is a horror show
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self.addEventListener("fetch", e => {
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e.respondWith(
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caches.match(e.request).then(r => {
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console.log("[Service Worker] Fetching resource:", e.request.url);
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return r || fetch(e.request).then(response => {
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return caches.open(cacheName).then(cache => {
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console.log("[Service Worker] Caching new resource:", e.request.url);
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cache.put(e.request, respone.clone());
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return response;
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});
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});
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})
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);
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});
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