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still kinda working

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This commit is contained in:
Jade (Rose) Rowland 2024-03-23 14:45:35 -04:00
parent e8f6124a07
commit aa36d25b9a
3 changed files with 69 additions and 36 deletions
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30
packages/core/clockworker.js
View File

@ -12,6 +12,7 @@ function getTime() {
let num_cycles_at_cps_change = 0;
let num_ticks_since_cps_change = 0;
let num_seconds_at_cps_change = 0;
let cps = 0.5;
// {id: {started: boolean}}
const clients = new Map();
@ -22,14 +23,36 @@ const sendMessage = (type, payload) => {
channel.postMessage({ type, payload });
};
//phase, num_cycles_at_cps_change, cps, seconds_at_cps_change
const sendTick = (phase, duration, tick, time) => {
const num_seconds_since_cps_change = num_ticks_since_cps_change * duration;
const tickdeadline = phase - time;
const lastTick = time + tickdeadline;
const num_cycles_since_cps_change = num_seconds_since_cps_change * cps;
const begin = num_cycles_at_cps_change + num_cycles_since_cps_change;
const secondsSinceLastTick = time - lastTick - duration;
const eventLength = duration * cps;
const end = begin + eventLength;
const cycle = begin + secondsSinceLastTick * cps;
sendMessage('tick', {
phase,
duration,
time,
begin,
end,
cps,
tickdeadline,
num_cycles_at_cps_change,
num_seconds_at_cps_change,
duration,
num_ticks_since_cps_change,
num_seconds_since_cps_change,
cycle,
});
num_ticks_since_cps_change++;
};
@ -71,7 +94,9 @@ const processMessage = (message) => {
switch (type) {
case 'cpschange': {
if (payload.cps !== cps) {
num_cycles_at_cps_change = num_cycles_at_cps_change + num_ticks_since_cps_change * duration * cps;
const num_seconds_since_cps_change = num_ticks_since_cps_change * duration;
num_cycles_at_cps_change = num_cycles_at_cps_change + num_seconds_since_cps_change * cps;
num_seconds_at_cps_change = num_seconds_at_cps_change + num_seconds_since_cps_change;
cps = payload.cps;
num_ticks_since_cps_change = 0;
}
@ -97,7 +122,6 @@ this.onconnect = function (e) {
const port = e.ports[0];
port.addEventListener('message', function (e) {
console.log(e.data);
processMessage(e.data);
});
port.start(); // Required when using addEventListener. Otherwise called implicitly by onmessage setter.

73
packages/core/neocyclist.mjs
View File

@ -21,9 +21,10 @@ export class NeoCyclist {
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
this.worker_time_dif; // 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
@ -32,63 +33,69 @@ 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_since_cps_change, tickdeadline) => {
const time_dif = getTime() - num_seconds_since_cps_change + tickdeadline;
// const time_dif = workertime - time;
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;
}
};
const getTickDeadline = (phase, time) => {
return phase - time - worker_time_dif;
};
const tickCallback = (payload) => {
const workertime = payload.time;
const time = this.getTime();
const { duration, phase, num_ticks_since_cps_change, num_cycles_at_cps_change, cps } = payload;
setTimeReference(time, workertime);
this.cps = cps;
//calculate begin and end
const eventLength = duration * cps;
const num_cycles_since_cps_change = num_ticks_since_cps_change * eventLength;
const begin = num_cycles_at_cps_change + num_cycles_since_cps_change;
const tickdeadline = getTickDeadline(phase, time);
const end = begin + eventLength;
//calculate current cycle
let {
num_cycles_at_cps_change,
cps,
num_seconds_at_cps_change,
duration,
num_seconds_since_cps_change,
begin,
end,
tickdeadline,
} = payload;
// const tickdeadline = phase - payload.time;
const lastTick = time + tickdeadline;
const secondsSinceLastTick = time - lastTick - duration;
this.cycle = begin + secondsSinceLastTick * cps;
//set the weight of average time diff and processs haps
if (this.time_dif == null) {
this.time_dif = getTime() - num_seconds_since_cps_change + tickdeadline;
}
setTimeReference(num_seconds_since_cps_change, tickdeadline);
this.cps = cps;
this.cycle = begin + secondsSinceLastTick * cps;
// this.cycle = payload.cycle;
weight = Math.min(weight + 1, maxWeight);
processHaps(begin, end, tickdeadline);
processHaps(begin, end, num_cycles_at_cps_change, num_seconds_at_cps_change);
this.time_at_last_tick_message = this.getTime();
};
const processHaps = (begin, end, tickdeadline) => {
const processHaps = (begin, end, num_cycles_at_cps_change, seconds_at_cps_change) => {
if (this.started === false) {
return;
}
const haps = this.pattern.queryArc(begin, end, { _cps: this.cps });
haps.forEach((hap) => {
if (hap.part.begin.equals(hap.whole.begin)) {
const deadline = (hap.whole.begin - begin) / this.cps + tickdeadline + this.latency;
if (hap.hasOnset()) {
const targetTime =
(hap.whole.begin - num_cycles_at_cps_change) / this.cps +
seconds_at_cps_change +
this.latency +
this.time_dif;
const duration = hap.duration / this.cps;
onTrigger?.(hap, deadline, duration, this.cps);
onTrigger?.(hap, 0, duration, this.cps, targetTime);
}
});
};
@ -131,6 +138,8 @@ export class NeoCyclist {
this.setStarted(true);
}
stop() {
this.time_dif = null;
this.worker_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,