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Jade (Rose) Rowland 2025-08-17 16:49:10 -04:00
parent 8c4f10464b
commit e9aef9e4d4
4 changed files with 48 additions and 13 deletions
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20
packages/superdough/reverb.mjs
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@ -1,7 +1,8 @@
import reverbGen from './reverbGen.mjs';
if (typeof AudioContext !== 'undefined') {
AudioContext.prototype.adjustLength = function (duration, buffer) {
AudioContext.prototype.adjustLength = function (duration, buffer, speed = 1, offsetSeconds = 0) {
const offset = offsetSeconds * buffer.sampleRate;
const newLength = buffer.sampleRate * duration;
const newBuffer = this.createBuffer(buffer.numberOfChannels, buffer.length, buffer.sampleRate);
for (let channel = 0; channel < buffer.numberOfChannels; channel++) {
@ -9,22 +10,29 @@ if (typeof AudioContext !== 'undefined') {
let newData = newBuffer.getChannelData(channel);
for (let i = 0; i < newLength; i++) {
newData[i] = oldData[i] || 0;
let position = (offset + i * Math.abs(speed)) % oldData.length;
if (speed < 1) {
position = position * -1;
}
newData[i] = oldData.at(position) || 0;
}
}
return newBuffer;
};
AudioContext.prototype.createReverb = function (duration, fade, lp, dim, ir) {
AudioContext.prototype.createReverb = function (duration, fade, lp, dim, ir, irspeed, irbegin) {
const convolver = this.createConvolver();
convolver.generate = (d = 2, fade = 0.1, lp = 15000, dim = 1000, ir) => {
convolver.generate = (d = 2, fade = 0.1, lp = 15000, dim = 1000, ir, irspeed, irbegin) => {
convolver.duration = d;
convolver.fade = fade;
convolver.lp = lp;
convolver.dim = dim;
convolver.ir = ir;
convolver.irspeed = irspeed;
convolver.irbegin = irbegin;
if (ir) {
convolver.buffer = this.adjustLength(d, ir);
convolver.buffer = this.adjustLength(d, ir, irspeed, irbegin);
} else {
reverbGen.generateReverb(
{
@ -41,7 +49,7 @@ if (typeof AudioContext !== 'undefined') {
);
}
};
convolver.generate(duration, fade, lp, dim, ir);
convolver.generate(duration, fade, lp, dim, ir, irspeed, irbegin);
return convolver;
};
}