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cut + loop

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This commit is contained in:
Felix Roos 2022-09-21 22:44:56 +02:00
parent 819abbfa7a
commit 8d5682deb0
1 changed files with 14 additions and 2 deletions
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16
packages/webaudio/webaudio.mjs
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@ -153,6 +153,8 @@ try {
console.warn('could not load AudioWorklet effects coarse, crush and shape', err); console.warn('could not load AudioWorklet effects coarse, crush and shape', err);
} }
const cutGroups = [];
Pattern.prototype.out = function () { Pattern.prototype.out = function () {
return this.onTrigger(async (t, hap, ct, cps) => { return this.onTrigger(async (t, hap, ct, cps) => {
const hapDuration = hap.duration / cps; const hapDuration = hap.duration / cps;
@ -189,6 +191,8 @@ Pattern.prototype.out = function () {
vowel, vowel,
unit, unit,
nudge = 0, // TODO: is this in seconds? nudge = 0, // TODO: is this in seconds?
cut,
loop,
} = hap.value; } = hap.value;
const { velocity = 1 } = hap.context; const { velocity = 1 } = hap.context;
gain *= velocity; // legacy fix for velocity gain *= velocity; // legacy fix for velocity
@ -255,7 +259,6 @@ Pattern.prototype.out = function () {
console.warn('no buffer source'); console.warn('no buffer source');
return; return;
} }
// TODO: cut, loop
bufferSource.playbackRate.value = Math.abs(speed) * bufferSource.playbackRate.value; bufferSource.playbackRate.value = Math.abs(speed) * bufferSource.playbackRate.value;
if (unit === 'c') { if (unit === 'c') {
// are there other units? // are there other units?
@ -267,10 +270,19 @@ Pattern.prototype.out = function () {
// the midway point through a 10-second audio buffer is still 5." // the midway point through a 10-second audio buffer is still 5."
const offset = begin * duration * bufferSource.playbackRate.value; const offset = begin * duration * bufferSource.playbackRate.value;
duration = (end - begin) * duration; duration = (end - begin) * duration;
if (loop) {
bufferSource.loop = true;
bufferSource.loopStart = offset;
bufferSource.loopEnd = offset + duration;
duration = loop * duration;
}
t += nudge; t += nudge;
bufferSource.start(t, offset); bufferSource.start(t, offset);
if (cut !== undefined) {
cutGroups[cut]?.stop(); // fade out?
cutGroups[cut] = bufferSource;
}
chain.push(bufferSource); chain.push(bufferSource);
if (soundfont || clip) { if (soundfont || clip) {
const env = ac.createGain(); const env = ac.createGain();