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use phase to allow smooth tempo changes

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This commit is contained in:
Felix Roos 2022-08-12 22:01:09 +02:00
parent ea1ffca4ae
commit c2354bffa2
1 changed files with 6 additions and 5 deletions
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11
packages/webaudio/scheduler.mjs
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@ -9,21 +9,22 @@ import { ClockWorker } from './clockworker.mjs';
export class Scheduler {
worker;
pattern;
startedAt;
phase;
audioContext;
cps = 1;
constructor({ audioContext, interval = 0.1, onEvent, latency = 0.1 }) {
this.audioContext = audioContext;
this.worker = new ClockWorker((tick, interval) => {
const begin = tick * interval * this.cps;
const end = (tick + 1) * interval * this.cps;
const begin = this.phase;
const end = this.phase + interval * this.cps;
this.phase = end;
const haps = this.pattern.queryArc(begin, end);
haps.forEach((e) => {
if (!e.part.begin.equals(e.whole.begin)) {
return;
}
if (e.context.onTrigger) {
const ctxTime = e.whole.begin / this.cps + this.startedAt + latency;
const ctxTime = (e.whole.begin - begin) / this.cps + this.audioContext.currentTime + latency;
e.context.onTrigger(ctxTime, e, this.audioContext.currentTime, this.cps);
}
if (onEvent) {
@ -37,7 +38,7 @@ export class Scheduler {
throw new Error('Scheduler: no pattern set! call .setPattern first.');
}
this.audioContext.resume();
this.startedAt = this.audioContext.currentTime;
this.phase = 0;
this.worker.start();
}
stop() {