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Parity with old adsr

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Aria 2025-08-28 00:31:37 -05:00
parent ea017e7622
commit 869141b0a3
1 changed files with 15 additions and 15 deletions
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30
packages/superdough/worklets.mjs
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@ -933,6 +933,7 @@ class EnvelopeProcessor extends AudioWorkletProcessor {
this.state = 0;
this.beginTime = 0;
this.endTime = 0;
this.attackStart = 0;
}
_shape(u, c) {
@ -947,29 +948,29 @@ class EnvelopeProcessor extends AudioWorkletProcessor {
}
}
_advance(start, target, length, curve) {
if (length <= 1 || start === target) {
_advance(start, target, time, curve) {
if (time === 0 || start === target) {
this.val = target;
} else {
const u = Math.min(1, this.segIdx / (length - 1));
const u = Math.min(1, (currentTime - this.beginTime) / time);
const us = this._shape(u, curve);
this.val = start + (target - start) * us;
}
this.segIdx++;
}
process(_inputs, outputs, params) {
const out = outputs[0][0];
if (!out) return true;
const begin = pv(params.begin, 0);
this.endTime = pv(params.end, 0);
const retrigger = pv(params.retrigger, 0) >= 0.5; // convert to bool
if (begin !== this.beginTime && (this.state === 0 || retrigger)) {
// triggered
this.beginTime = begin;
this.state = 1;
this.segIdx = 0;
this.endTime = pv(params.end, 0);
this.attackStart = this.val;
}
const susTime = this.endTime - this.beginTime;
for (let i = 0; i < out.length; i++) {
const attack = pv(params.attack, i);
const decay = pv(params.decay, i);
@ -981,17 +982,16 @@ class EnvelopeProcessor extends AudioWorkletProcessor {
const peak = pv(params.peak, i);
const states = [
{ time: Number.POSITIVE_INFINITY, start: 0, target: 0 }, // idle
{ time: attack, start: 0, target: peak, curve: aCurve },
{ time: decay, start: 1, target: sustain, curve: dCurve },
{ time: this.endTime - this.beginTime - attack - decay, start: sustain, target: sustain },
{ time: release, start: sustain, target: 0, curve: rCurve },
{ time: attack, start: this.attackStart, target: 1, curve: aCurve },
{ time: attack + decay, start: 1, target: sustain, curve: dCurve },
{ time: susTime, start: sustain, target: sustain },
{ time: susTime + release, start: sustain, target: 0, curve: rCurve },
]
const {time, start, target, curve} = states[this.state];
const length = Math.floor(time * sampleRate);
this._advance(start, target, length, curve);
if (this.segIdx >= length) {
let {time, start, target, curve} = states[this.state];
this._advance(start, target, time, curve);
while (currentTime - this.beginTime >= time) {
this.state = (this.state + 1) % states.length;
this.segIdx = 0;
time = states[this.state].time;
}
out[i] = this.val * peak;
}