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lazy sample loading

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Felix Roos 2025-06-12 02:25:04 +02:00
parent 43504d16b6
commit bbd7ed0f27
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1 changed files with 33 additions and 15 deletions
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48
packages/webaudio/supradough.mjs
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@ -16,11 +16,35 @@ function initDoughWorklet() {
connectToDestination(doughWorklet); // channels? connectToDestination(doughWorklet); // channels?
} }
const soundMap = new Map();
const loadedSounds = new Map();
Pattern.prototype.supradough = function () { Pattern.prototype.supradough = function () {
return this.onTrigger((_, hap, __, cps, begin) => { return this.onTrigger((_, hap, __, cps, begin) => {
hap.value._begin = begin; hap.value._begin = begin;
hap.value._duration = hap.duration / cps; hap.value._duration = hap.duration / cps;
!doughWorklet && initDoughWorklet(); !doughWorklet && initDoughWorklet();
const s = (hap.value.bank ? hap.value.bank + '_' : '') + hap.value.s;
const n = hap.value.n ?? 0;
const soundKey = `${s}:${n}`;
if (soundMap.has(s)) {
hap.value.s = soundKey; // dough.mjs is unaware of bank and n (only maps keys to buffers)
}
if (soundMap.has(s) && !loadedSounds.has(soundKey)) {
const urls = soundMap.get(s);
const url = urls[n % urls.length];
console.log(`load ${soundKey} from ${url}`);
const loadSample = fetchSample(url);
loadedSounds.set(soundKey, loadSample);
loadSample.then(({ channels, sampleRate }) =>
doughWorklet.port.postMessage({
sample: soundKey,
channels,
sampleRate,
}),
);
}
doughWorklet.port.postMessage({ spawn: hap.value }); doughWorklet.port.postMessage({ spawn: hap.value });
}, 1); }, 1);
}; };
@ -79,7 +103,7 @@ export async function fetchSampleMap(url) {
// for some reason, only piano and flute work.. is it because mp3?? // for some reason, only piano and flute work.. is it because mp3??
async function loadSampleChannels(key, url) { async function fetchSample(url) {
const buffer = await fetch(url) const buffer = await fetch(url)
.then((res) => res.arrayBuffer()) .then((res) => res.arrayBuffer())
.then((buf) => getAudioContext().decodeAudioData(buf)); .then((buf) => getAudioContext().decodeAudioData(buf));
@ -87,7 +111,7 @@ async function loadSampleChannels(key, url) {
for (let i = 0; i < buffer.numberOfChannels; i++) { for (let i = 0; i < buffer.numberOfChannels; i++) {
channels.push(buffer.getChannelData(i)); channels.push(buffer.getChannelData(i));
} }
return [key, channels, buffer.sampleRate]; return { channels, sampleRate: buffer.sampleRate };
} }
export async function doughsamples(sampleMap, baseUrl) { export async function doughsamples(sampleMap, baseUrl) {
@ -96,17 +120,11 @@ export async function doughsamples(sampleMap, baseUrl) {
// console.log('json', json, 'base', base); // console.log('json', json, 'base', base);
return doughsamples(json, base); return doughsamples(json, base);
} }
const json = ( Object.entries(sampleMap).map(async ([key, urls]) => {
await Promise.all( if (key !== '_base') {
Object.entries(sampleMap).map(async ([key, url]) => { urls = urls.map((url) => baseUrl + url);
if (key !== '_base') { // console.log('set', key, urls);
url = baseUrl + url[0]; soundMap.set(key, urls);
return loadSampleChannels(key, url); }
} });
}),
)
).filter(Boolean);
// console.log('sampleMap', json);
!doughWorklet && initDoughWorklet();
doughWorklet.port.postMessage({ samples: json });
} }