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fix osc bundle timestamp glitches caused by drifting clock

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This commit is contained in:
Jade Rowland 2023-08-17 18:01:41 -04:00
parent 5c2101de1a
commit 10bce85561
1 changed files with 6 additions and 9 deletions
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15
packages/osc/osc.mjs
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@ -5,6 +5,7 @@ This program is free software: you can redistribute it and/or modify it under th
*/
import OSC from 'osc-js';
import { logger, parseNumeral, Pattern } from '@strudel.cycles/core';
let connection; // Promise<OSC>
@ -33,9 +34,6 @@ function connect() {
return connection;
}
const latency = 0.1;
let startedAt = -1;
/**
*
* Sends each hap as an OSC message, which can be picked up by SuperCollider or any other OSC-enabled software.
@ -51,17 +49,16 @@ Pattern.prototype.osc = function () {
const osc = await connect();
const cycle = hap.wholeOrPart().begin.valueOf();
const delta = hap.duration.valueOf();
// time should be audio time of onset
// currentTime should be current time of audio context (slightly before time)
if (startedAt < 0) {
startedAt = Date.now() - currentTime * 1000;
}
const controls = Object.assign({}, { cps, cycle, delta }, hap.value);
// make sure n and note are numbers
controls.n && (controls.n = parseNumeral(controls.n));
controls.note && (controls.note = parseNumeral(controls.note));
const keyvals = Object.entries(controls).flat();
const ts = Math.floor(startedAt + (time + latency) * 1000);
// time should be audio time of onset
// currentTime should be current time of audio context (slightly before time)
const offset = (time - currentTime) * 1000;
// timestamp in milliseconds used to trigger the osc bundle at a precise moment
const ts = Math.floor(Date.now() + offset);
const message = new OSC.Message('/dirt/play', ...keyvals);
const bundle = new OSC.Bundle([message], ts);
bundle.timestamp(ts); // workaround for https://github.com/adzialocha/osc-js/issues/60