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<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>StreamEngine bench</title>
<style>
:root {
color-scheme: dark;
--bg: #12131a;
--card: #1b1d27;
--line: #2c2f3d;
--text: #e6e8f0;
--dim: #8b90a5;
--ok: #4ade80;
--warn: #fbbf24;
--bad: #f87171;
}
* { box-sizing: border-box; }
body {
margin: 0;
padding: 24px;
background: var(--bg);
color: var(--text);
font: 14px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace;
}
h1 { font-size: 17px; margin: 0 0 4px; }
p.lede { color: var(--dim); margin: 0 0 20px; max-width: 70ch; }
.controls { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
input, button, select {
font: inherit;
padding: 7px 11px;
border-radius: 6px;
border: 1px solid var(--line);
background: var(--card);
color: var(--text);
}
input { min-width: 340px; flex: 1; }
button { cursor: pointer; }
button:hover { border-color: var(--dim); }
button.primary { background: #2f3550; border-color: #3d456b; }
.grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(390px, 1fr)); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 14px; }
.card header { display: flex; align-items: baseline; gap: 8px; margin-bottom: 10px; }
.card h2 { font-size: 13px; margin: 0; flex: 1; overflow-wrap: anywhere; }
.tag { font-size: 11px; padding: 2px 7px; border-radius: 999px; border: 1px solid var(--line); color: var(--dim); }
.stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 6px 14px; margin-bottom: 10px; }
.stat { display: flex; justify-content: space-between; gap: 8px; }
.stat span:first-child { color: var(--dim); }
.state-playing { color: var(--ok); }
.state-waiting { color: var(--warn); }
.state-error { color: var(--bad); }
.meter { height: 4px; border-radius: 2px; background: #0d0e14; overflow: hidden; margin-bottom: 10px; }
.meter i { display: block; height: 100%; background: var(--ok); width: 0; transition: width 90ms linear; }
.log { max-height: 150px; overflow: auto; font-size: 12px; color: var(--dim); border-top: 1px solid var(--line); padding-top: 8px; }
.log div { white-space: pre; }
.log .gap { color: var(--bad); }
</style>
</head>
<body>
<h1>StreamEngine bench</h1>
<p class="lede">
Measures how long the sound actually stops when a stream drops. Add one engine per URL,
then cut the network (DevTools → Network → Offline, or toggle Wi-Fi) and read the
gap durations. Silence is detected on the decoded output, so it counts what you would hear,
not what the network did. Point two engines at the same station over different transports
(the HLS and Icecast presets below are both FIP) to compare them under the same outage.
</p>
<div class="controls">
<select id="preset">
<option value="https://stream.radiofrance.fr/fip/fip_hifi.m3u8">FIP (HLS)</option>
<option value="https://icecast.radiofrance.fr/fip-hifi.aac">FIP (Icecast AAC)</option>
<option value="https://streams.radiomast.io/nts2">NTS 2 (Icecast MP3)</option>
<option value="https://stream.radioparadise.com/aac-320">Radio Paradise (Icecast AAC)</option>
<option value="https://orf-live.ors-shoutcast.at/fm4-q2a">FM4 (Icecast MP3)</option>
<option value="https://play.streamafrica.net/lofiradio">Lofi Radio (Icecast MP3)</option>
</select>
<input id="url" placeholder="stream URL" />
<button class="primary" id="add">Add engine</button>
<button id="stop-all">Stop all</button>
</div>
<div class="grid" id="grid"></div>
<script type="module">
import { StreamEngine } from "../src/stream-engine.ts";
/** Output below this RMS for longer than SILENCE_HOLD_MS counts as a gap. */
const SILENCE_RMS = 0.004;
const SILENCE_HOLD_MS = 250;
const presetEl = document.getElementById("preset");
const urlEl = document.getElementById("url");
const gridEl = document.getElementById("grid");
urlEl.value = presetEl.value;
presetEl.addEventListener("change", () => (urlEl.value = presetEl.value));
/** Created on the first click so the autoplay policy is satisfied. */
let ctx = null;
const benches = [];
document.getElementById("add").addEventListener("click", () => {
const url = urlEl.value.trim();
if (url) benches.push(createBench(url));
});
document.getElementById("stop-all").addEventListener("click", () => {
for (const bench of benches) bench.engine.close();
});
function createBench(url) {
ctx ??= new AudioContext();
const el = new Audio();
const analyser = ctx.createAnalyser();
analyser.fftSize = 1024;
ctx.createMediaElementSource(el).connect(analyser).connect(ctx.destination);
const ui = renderCard(url);
const engine = new StreamEngine(el, {
label: hostOf(url),
events: {
onPlaying: () => ui.setState("playing"),
onWaiting: () => ui.setState("waiting"),
onError: (message) => ui.setState("error", message),
},
});
void ctx.resume();
void engine.open(url);
const bench = { engine, el, analyser, ui, silentSince: null, everPlayed: false, gaps: [] };
ui.onStop = () => engine.close();
ui.onReopen = () => void engine.open(url, true);
return bench;
}
// One loop drives every card: read the output level, track silence, refresh stats.
const samples = new Float32Array(1024);
setInterval(() => {
const now = performance.now();
for (const bench of benches) {
bench.analyser.getFloatTimeDomainData(samples);
let sumSquares = 0;
for (const sample of samples) sumSquares += sample * sample;
const rms = Math.sqrt(sumSquares / samples.length);
if (rms < SILENCE_RMS) {
bench.silentSince ??= now;
} else if (bench.silentSince !== null) {
const duration = now - bench.silentSince;
bench.silentSince = null;
if (duration < SILENCE_HOLD_MS) {
// Sub-threshold flicker, or just a quiet passage in the music.
} else if (!bench.everPlayed) {
// The very first silence is the initial connect, not a gap.
bench.everPlayed = true;
bench.ui.log(`first sound after ${(duration / 1000).toFixed(1)}s`);
} else {
bench.gaps.push(duration);
bench.ui.logGap(duration);
}
}
const ongoing = bench.silentSince === null ? 0 : now - bench.silentSince;
bench.ui.update({
transport: bench.engine.getTransport(),
level: rms,
buffered: bufferAhead(bench.el),
silence: ongoing >= SILENCE_HOLD_MS ? ongoing : 0,
worstGap: bench.gaps.length ? Math.max(...bench.gaps) : 0,
});
}
}, 100);
function bufferAhead(el) {
const { buffered, currentTime } = el;
for (let i = 0; i < buffered.length; i++) {
if (currentTime >= buffered.start(i) && currentTime <= buffered.end(i)) {
return buffered.end(i) - currentTime;
}
}
return 0;
}
function hostOf(url) {
try {
return new URL(url).hostname;
} catch {
return url;
}
}
function renderCard(url) {
const card = document.createElement("section");
card.className = "card";
card.innerHTML = `
<header>
<h2>${hostOf(url)}</h2>
<span class="tag" data-transport>…</span>
<span class="tag" data-state>opening</span>
</header>
<div class="meter"><i data-level></i></div>
<div class="stats">
<div class="stat"><span>buffer ahead</span><b data-buffered>–</b></div>
<div class="stat"><span>silent now</span><b data-silence>–</b></div>
<div class="stat"><span>gaps</span><b data-count>0</b></div>
<div class="stat"><span>worst gap</span><b data-worst>–</b></div>
</div>
<div class="controls">
<button data-reopen>Force reopen</button>
<button data-stop>Stop</button>
</div>
<div class="log" data-log></div>
`;
gridEl.appendChild(card);
const find = (name) => card.querySelector(`[data-${name}]`);
const logEl = find("log");
const stateEl = find("state");
let gapCount = 0;
const api = {
onStop: () => {},
onReopen: () => {},
setState(state, detail = "") {
stateEl.textContent = state;
stateEl.className = `tag state-${state}`;
if (detail) api.log(detail);
},
log(message) {
const line = document.createElement("div");
line.textContent = `${clock()} ${message}`;
logEl.prepend(line);
},
logGap(ms) {
gapCount++;
find("count").textContent = String(gapCount);
const line = document.createElement("div");
line.className = "gap";
line.textContent = `${clock()} gap ${(ms / 1000).toFixed(2)}s`;
logEl.prepend(line);
},
update({ transport, level, buffered, silence, worstGap }) {
find("transport").textContent = transport;
find("level").style.width = `${Math.min(100, level * 600)}%`;
find("buffered").textContent = `${buffered.toFixed(1)}s`;
find("silence").textContent = silence ? `${(silence / 1000).toFixed(1)}s` : "–";
find("worst").textContent = worstGap ? `${(worstGap / 1000).toFixed(2)}s` : "–";
},
};
find("stop").addEventListener("click", () => api.onStop());
find("reopen").addEventListener("click", () => api.onReopen());
return api;
}
function clock() {
return new Date().toLocaleTimeString("en-GB");
}
</script>
</body>
</html>
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