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envelope

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This commit is contained in:
Jade (Rose) Rowland 2024-02-29 21:07:43 -05:00
parent f62b268f1d
commit 1690030b1d
2 changed files with 39 additions and 3 deletions
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20
packages/superdough/synth.mjs
View File

@ -25,9 +25,9 @@ const waveforms = ['sine', 'square', 'triangle', 'sawtooth'];
const noises = ['pink', 'white', 'brown', 'crackle'];
export function registerSynthSounds() {
registerSound('bet', (t, value, onended) => {
registerSound('bet', (begin, value, onended) => {
const ac = getAudioContext();
let { note, freq, duration, cps } = value;
let { note, freq, duration } = value;
note = note || 36;
if (typeof note === 'string') {
note = noteToMidi(note); // e.g. c3 => 48
@ -40,7 +40,21 @@ export function registerSynthSounds() {
// set frequency
freq = Number(freq);
const node = getWorklet(ac, 'better-oscillator', { frequency: freq, start: t, end: t + duration * cps });
const [attack, decay, sustain, release] = getADSRValues(
[value.attack, value.decay, value.sustain, value.release],
'linear',
[0.001, 0.05, 0.6, 0.01],
);
const holdend = begin + duration;
const end = holdend + release + 0.01;
let node = getWorklet(ac, 'better-oscillator', { frequency: freq, begin, end });
const envGain = gainNode(1);
node = node.connect(envGain);
getParamADSR(node.gain, attack, decay, sustain, release, 0, 1, begin, holdend, 'exponential');
return {
node,

22
packages/superdough/worklets.mjs
View File

@ -143,12 +143,27 @@ class BetterOscillatorProcessor extends AudioWorkletProcessor {
}
static get parameterDescriptors() {
return [
{
name: 'begin',
defaultValue: 0,
max: Number.POSITIVE_INFINITY,
min: 0,
},
{
name: 'end',
defaultValue: 0,
max: Number.POSITIVE_INFINITY,
min: 0,
},
{
name: 'phase',
defaultValue: 0,
max: 1,
min: 0,
},
{
name: 'duty',
defaultValue: 0.5,
@ -174,6 +189,13 @@ class BetterOscillatorProcessor extends AudioWorkletProcessor {
];
}
process(input, outputs, params) {
if (currentTime <= params.begin[0]) {
return true;
}
if (currentTime >= params.end[0]) {
return false;
}
for (let z = 0; z < outputs.length; z++) {
const out = outputs[z][0];
const outlen = out.length;