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Jade (Rose) Rowland 2024-03-23 16:18:16 -04:00
parent bc917dcf8b
commit f00a08ef9e
2 changed files with 16 additions and 32 deletions
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46
packages/core/neocyclist.mjs
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@ -18,13 +18,12 @@ export class NeoCyclist {
this.latency = 0.1; // fixed trigger time offset
this.cycle = 0;
this.id = Math.round(Date.now() * Math.random());
this.worker_time_dif;
this.worker = new SharedWorker(new URL('./clockworker.js', import.meta.url));
this.worker.port.start();
this.time_dif;
this.channel = new BroadcastChannel('strudeltick');
let worker_time_dif = 0; // time difference between audio context clock and worker clock
let weight = 0; // the amount of weight that is applied to the current average when averaging a new time dif
const maxWeight = 20;
const precision = 10 ** 3; //round off time diff to prevent accumulating outliers
@ -33,24 +32,25 @@ export class NeoCyclist {
// aditionally, the message time of the worker pinging the callback to process haps can be inconsistent.
// we need to keep a rolling weighted average of the time difference between the worker clock and audio context clock
// in order to schedule events consistently.
const setTimeReference = (time, workertime) => {
const time_dif = workertime - time;
if (worker_time_dif === 0) {
worker_time_dif = time_dif;
const setTimeReference = (num_seconds_at_cps_change, num_seconds_since_cps_change, tickdeadline) => {
const time_dif = getTime() - (num_seconds_at_cps_change + num_seconds_since_cps_change) + tickdeadline;
if (this.worker_time_dif == null) {
this.worker_time_dif = time_dif;
} else {
const w = 1; //weight of new time diff;
const new_dif = Math.round(((worker_time_dif * weight + time_dif * w) / (weight + w)) * precision) / precision;
const new_dif =
Math.round(((this.worker_time_dif * weight + time_dif * w) / (weight + w)) * precision) / precision;
if (new_dif != worker_time_dif) {
if (new_dif != this.worker_time_dif) {
// reset the weight so the clock recovers faster from an audio context freeze/dropout if it happens
weight = 4;
}
worker_time_dif = new_dif;
this.worker_time_dif = new_dif;
}
weight = Math.min(weight + 1, maxWeight);
};
const tickCallback = (payload) => {
const workertime = payload.time;
const time = this.getTime();
let {
@ -65,30 +65,13 @@ export class NeoCyclist {
end,
tickdeadline,
} = payload;
// const tickdeadline = phase - payload.time;
const lastTick = time + tickdeadline;
const secondsSinceLastTick = time - lastTick - duration;
// console.log(phase - payload.time);
// console.log({ num_seconds_since_cps_change });
if (this.time_dif == null) {
this.time_dif = getTime() - num_seconds_since_cps_change + tickdeadline;
}
setTimeReference(time, workertime);
this.cps = cps;
//calculate begin and end
// const eventLength = duration * cps;
// const num_cycles_since_cps_change = num_seconds_since_cps_change * this.cps;
// const begin = num_cycles_at_cps_change + num_cycles_since_cps_change;
// const end = begin + eventLength;
//calculate current cycle
setTimeReference(num_seconds_at_cps_change, num_seconds_since_cps_change, tickdeadline);
const lastTick = time + tickdeadline;
const secondsSinceLastTick = time - lastTick - duration;
this.cycle = begin + secondsSinceLastTick * cps;
//set the weight of average time diff and processs haps
weight = Math.min(weight + 1, maxWeight);
processHaps(begin, end, phase, num_cycles_at_cps_change, num_seconds_at_cps_change);
this.time_at_last_tick_message = this.getTime();
@ -107,7 +90,7 @@ export class NeoCyclist {
(hap.whole.begin - num_cycles_at_cps_change) / this.cps +
seconds_at_cps_change +
this.latency +
this.time_dif;
this.worker_time_dif;
const duration = hap.duration / this.cps;
onTrigger?.(hap, 0, duration, this.cps, targetTime);
}
@ -152,6 +135,7 @@ export class NeoCyclist {
this.setStarted(true);
}
stop() {
this.worker_time_dif = null;
this.time_dif = null;
logger('[cyclist] stop');
this.setStarted(false);

2
website/src/repl/Repl.jsx
View File

@ -73,7 +73,7 @@ export function Repl({ embedded = false }) {
});
};
const editor = new StrudelMirror({
sync: false,
sync: true,
defaultOutput: webaudioOutput,
getTime: () => getAudioContext().currentTime,
setInterval,