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Preserve notification preview opening notes through audio startup

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mikecarper
2026-09-30 08:56:12 -07:00
parent 760fa9434e
commit def8db940d
5 changed files with 90 additions and 15 deletions
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docs/_javascript/notification_builder.js
+28 -9
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@@ -1,6 +1,7 @@
(function (global) {
"use strict";
const OUTPUTS = { vibration: 1, sound: 2, led: 4, screen: 8, gpio: 16 };
const PREVIEW_WARMUP_MS = 1000;
const EXAMPLES = {
find: { label: "Find my node", kind: "all", id: "", when: "disconnected", vibration: "200,200,200", led: "100,100,100,700", sound: "find:d=8,o=6,b=180:c,e,g,p", screen: "on", gpio: "off", repeat: "forever", gap: "1000", stop: "connected" },
food: { label: "Your food truck order is ready", kind: "channel", id: "3", when: "any", vibration: "50,300,40,20,500", led: "100,100,100,500", sound: "order:d=8,o=5,b=180:c,e,g,4c6", screen: "on", gpio: "off", repeat: "forever", gap: "2000", stop: "button" },
@@ -33,16 +34,18 @@
return { ms, hz: match[2] === "p" ? 0 : 440 * Math.pow(2, (midi - 69) / 12) };
});
}
function melodyWav(text) {
function melodyWav(text, leadInMs = 0) {
if (!Number.isInteger(leadInMs) || leadInMs < 0 || leadInMs > 2000) throw new Error("Audio lead-in must be 0-2000 ms.");
const notes = melody(text), rate = 22050;
const frames = Math.round(notes.reduce((total, note) => total + note.ms, 0) * rate / 1000);
if (!notes.length) leadInMs = 0;
const frames = Math.round((leadInMs + notes.reduce((total, note) => total + note.ms, 0)) * rate / 1000);
const bytes = new Uint8Array(44 + frames * 2), view = new DataView(bytes.buffer);
const label = (offset, value) => { for (let i = 0; i < value.length; i++) bytes[offset + i] = value.charCodeAt(i); };
label(0, "RIFF"); view.setUint32(4, bytes.length - 8, true); label(8, "WAVE");
label(12, "fmt "); view.setUint32(16, 16, true); view.setUint16(20, 1, true);
view.setUint16(22, 1, true); view.setUint32(24, rate, true); view.setUint32(28, rate * 2, true);
view.setUint16(32, 2, true); view.setUint16(34, 16, true); label(36, "data"); view.setUint32(40, frames * 2, true);
let elapsed = 0, start = 0;
let elapsed = leadInMs, start = Math.round(leadInMs * rate / 1000);
for (const note of notes) {
elapsed += note.ms;
const end = Math.round(elapsed * rate / 1000), count = end - start;
@@ -211,7 +214,9 @@
// Preview one cycle. Never creates an unbounded oscillator or vibration loop.
if (notes.length) {
// Use media playback rather than Web Audio's ambient/ringer channel on iOS.
previewUrl = global.URL.createObjectURL(new Blob([melodyWav(c.sound)], { type: "audio/wav" }));
// play() can resolve before the output is audible. Put warmup and melody
// in one stream so no opening notes are spent starting a cold audio route.
previewUrl = global.URL.createObjectURL(new Blob([melodyWav(c.sound, PREVIEW_WARMUP_MS)], { type: "audio/wav" }));
audio.src = previewUrl; audio.loop = false; audio.muted = false; audio.volume = 1;
find("preview-sound").textContent = "Starting melody...";
find("preview-time").textContent = "0 / " + duration + " ms";
@@ -226,26 +231,40 @@
stopPreview("Sound unavailable"); throw new Error("Sound preview could not start: " + e.message);
}
if (version !== previewVersion) return;
find("preview-sound").textContent = "Playing melody";
find("preview-sound").textContent = "Warming up audio...";
} else {
find("preview-sound").textContent = c.sound === "inherit" ? "Choose a melody to preview inherited sound." : "Sound is off for this preview.";
}
let finishedAt = null;
const started = performance.now() - (notes.length ? audio.currentTime * 1000 : 0);
const started = performance.now();
previewTimer = setInterval(() => {
if (!root.isConnected) { stopPreview(); return; }
let elapsed = performance.now() - started;
if (notes.length) {
if (!audio.ended) elapsed = audio.currentTime * 1000;
let mediaElapsed;
if (!audio.ended) {
mediaElapsed = audio.currentTime * 1000 - PREVIEW_WARMUP_MS;
}
else {
if (finishedAt === null) finishedAt = performance.now();
elapsed = tuneMs + performance.now() - finishedAt;
mediaElapsed = tuneMs + performance.now() - finishedAt;
}
// Some media clocks run ahead during preroll. Keep the display from
// spending the warmup or the first notes before real time has passed.
elapsed = Math.min(mediaElapsed, elapsed - PREVIEW_WARMUP_MS);
if (elapsed < 0) return;
find("preview-sound").textContent = "Playing melody";
}
for (const name of Object.keys(pulses)) root.querySelector('[data-indicator="' + name + '"]').dataset.on = String(level(pulses[name], elapsed));
root.querySelector('[data-indicator="screen"]').dataset.on = String(c.screen === "on");
find("preview-time").textContent = Math.min(Math.round(elapsed), duration) + " / " + duration + " ms";
if (elapsed >= duration && (!notes.length || audio.ended)) stopPreview("Cycle finished");
if (elapsed >= duration && (!notes.length || audio.ended)) {
clearInterval(previewTimer); previewTimer = null;
for (const item of root.querySelectorAll("[data-indicator]")) item.dataset.on = "false";
find("preview-sound").textContent = "Cycle finished";
// Do not load/reset an ended source: output may still have buffered
// notes. Explicit Stop, the next preview, or pagehide releases it.
}
}, 10);
}
const append = text => { log.textContent += text + "\n"; log.scrollTop = log.scrollHeight; };