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Jade (Rose) Rowland
2025-07-08 00:30:00 -04:00
parent ce5f425142
commit 1dd1ce254f
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packages/core/cyclist copy.mjs
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/*
cyclist.mjs - event scheduler for a single strudel instance. for multi-instance scheduler, see - see <https://codeberg.org/uzu/strudel/src/branch/main/packages/core/neocyclist.mjs>
Copyright (C) 2022 Strudel contributors - see <https://codeberg.org/uzu/strudel/src/branch/main/packages/core/cyclist.mjs>
This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details. You should have received a copy of the GNU Affero General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
import createClock from './zyklus.mjs';
import { logger } from './logger.mjs';
export class Cyclist {
constructor({
interval,
onTrigger,
onToggle,
onError,
getTime,
latency = 0.1,
setInterval,
clearInterval,
beforeStart,
}) {
this.started = false;
this.beforeStart = beforeStart;
this.cps = 0.5;
this.num_ticks_since_cps_change = 0;
this.lastTick = 0; // absolute time when last tick (clock callback) happened
this.lastBegin = 0; // query begin of last tick
this.lastEnd = 0; // query end of last tick
this.getTime = getTime; // get absolute time
this.num_cycles_at_cps_change = 0;
this.seconds_at_cps_change; // clock phase when cps was changed
this.onToggle = onToggle;
this.latency = latency; // fixed trigger time offset
this.clock = createClock(
getTime,
// called slightly before each cycle
(phase, duration, _, t) => {
if (this.num_ticks_since_cps_change === 0) {
this.num_cycles_at_cps_change = this.lastEnd;
this.seconds_at_cps_change = phase;
}
this.num_ticks_since_cps_change++;
const seconds_since_cps_change = this.num_ticks_since_cps_change * duration;
const num_cycles_since_cps_change = seconds_since_cps_change * this.cps;
try {
const begin = this.lastEnd;
this.lastBegin = begin;
const end = this.num_cycles_at_cps_change + num_cycles_since_cps_change;
this.lastEnd = end;
this.lastTick = phase;
if (phase < t) {
// avoid querying haps that are in the past anyway
console.log(`skip query: too late`);
return;
}
// query the pattern for events
const haps = this.pattern.queryArc(begin, end, { _cps: this.cps });
haps.forEach((hap) => {
if (hap.hasOnset()) {
const targetTime =
(hap.whole.begin - this.num_cycles_at_cps_change) / this.cps + this.seconds_at_cps_change + latency;
const duration = hap.duration / this.cps;
// the following line is dumb and only here for backwards compatibility
// see https://codeberg.org/uzu/strudel/pulls/1004
const deadline = targetTime - phase;
// this onTrigger has another signature
onTrigger?.(hap, deadline, duration, this.cps, targetTime);
if (hap.value.cps !== undefined && this.cps != hap.value.cps) {
this.cps = hap.value.cps;
this.num_ticks_since_cps_change = 0;
}
}
});
} catch (e) {
logger(`[cyclist] error: ${e.message}`);
onError?.(e);
}
},
interval, // duration of each cycle
0.1,
0.1,
setInterval,
clearInterval,
);
}
now() {
if (!this.started) {
return 0;
}
const secondsSinceLastTick = this.getTime() - this.lastTick - this.clock.duration;
return this.lastBegin + secondsSinceLastTick * this.cps; // + this.clock.minLatency;
}
setStarted(v) {
this.started = v;
this.onToggle?.(v);
}
async start() {
await this.beforeStart?.();
this.num_ticks_since_cps_change = 0;
this.num_cycles_at_cps_change = 0;
if (!this.pattern) {
throw new Error('Scheduler: no pattern set! call .setPattern first.');
}
logger('[cyclist] start');
this.clock.start();
this.setStarted(true);
}
pause() {
logger('[cyclist] pause');
this.clock.pause();
this.setStarted(false);
}
stop() {
logger('[cyclist] stop');
this.clock.stop();
this.lastEnd = 0;
this.setStarted(false);
}
async setPattern(pat, autostart = false) {
this.pattern = pat;
if (autostart && !this.started) {
await this.start();
}
}
setCps(cps = 0.5) {
if (this.cps === cps) {
return;
}
this.cps = cps;
this.num_ticks_since_cps_change = 0;
}
log(begin, end, haps) {
const onsets = haps.filter((h) => h.hasOnset());
console.log(`${begin.toFixed(4)} - ${end.toFixed(4)} ${Array(onsets.length).fill('I').join('')}`);
}
}