hacklab/strudel
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Merge branch 'tidalcycles:main' into envelope_improvements

Browse source
This commit is contained in:
Jade (Rose) Rowland 2023-12-15 18:27:23 -05:00 • committed by GitHub
commit 9f50f6ef0e
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
46 changed files with 2596 additions and 323 deletions
Download patch file Download diff file Expand all files Collapse all files

23
packages/superdough/helpers.mjs
View file

@ -10,21 +10,24 @@ export function gainNode(value) {
// alternative to getADSR returning the gain node and a stop handle to trigger the release anytime in the future
export const getEnvelope = (attack, decay, sustain, release, velocity, begin) => {
const gainNode = getAudioContext().createGain();
let phase = begin;
gainNode.gain.setValueAtTime(0, begin);
gainNode.gain.linearRampToValueAtTime(velocity, begin + attack); // attack
gainNode.gain.linearRampToValueAtTime(sustain * velocity, begin + attack + decay); // sustain start
phase += attack;
gainNode.gain.linearRampToValueAtTime(velocity, phase); // attack
phase += decay;
let sustainLevel = sustain * velocity;
gainNode.gain.linearRampToValueAtTime(sustainLevel, phase); // decay / sustain
// sustain end
return {
node: gainNode,
stop: (t) => {
//if (typeof gainNode.gain.cancelAndHoldAtTime === 'function') {
// gainNode.gain.cancelAndHoldAtTime(t); // this seems to release instantly....
// see https://discord.com/channels/779427371270275082/937365093082079272/1086053607360712735
//} else {
// firefox: this will glitch when the sustain has not been reached yet at the time of release
gainNode.gain.setValueAtTime(sustain * velocity, t);
//}
gainNode.gain.linearRampToValueAtTime(0, t + release);
// to make sure the release won't begin before sustain is reached
phase = Math.max(t, phase);
// see https://github.com/tidalcycles/strudel/issues/522
gainNode.gain.setValueAtTime(sustainLevel, phase);
phase += release;
gainNode.gain.linearRampToValueAtTime(0, phase); // release
return phase;
},
};
};