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really simple reverb

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This commit is contained in:
Felix Roos 2022-09-25 16:36:59 +02:00
parent 513e0d748d
commit 933ef02df0
2 changed files with 43 additions and 1 deletions
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19
packages/webaudio/reverb.mjs Normal file
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@ -0,0 +1,19 @@
if (typeof AudioContext !== 'undefined') {
AudioContext.prototype.impulseResponse = function (duration) {
const length = this.sampleRate * duration;
const impulse = this.createBuffer(2, length, this.sampleRate);
const IR = impulse.getChannelData(0);
for (let i = 0; i < length; i++) IR[i] = (2 * Math.random() - 1) * Math.pow(1 - i / length, duration);
return impulse;
};
AudioContext.prototype.createReverb = function (duration) {
const convolver = this.createConvolver();
convolver.setDuration = (d) => {
convolver.buffer = this.impulseResponse(d);
};
this.duration = duration;
convolver.setDuration(duration);
return convolver;
};
}

25
packages/webaudio/webaudio.mjs
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@ -8,6 +8,7 @@ This program is free software: you can redistribute it and/or modify it under th
import * as strudel from '@strudel.cycles/core'; import * as strudel from '@strudel.cycles/core';
import { fromMidi, toMidi } from '@strudel.cycles/core'; import { fromMidi, toMidi } from '@strudel.cycles/core';
import './feedbackdelay.mjs'; import './feedbackdelay.mjs';
import './reverb.mjs';
import { loadBuffer, reverseBuffer } from './sampler.mjs'; import { loadBuffer, reverseBuffer } from './sampler.mjs';
const { Pattern } = strudel; const { Pattern } = strudel;
import './vowel.mjs'; import './vowel.mjs';
@ -207,6 +208,20 @@ function getDelay(orbit, delaytime, delayfeedback, t) {
return delays[orbit]; return delays[orbit];
} }
let reverbs = {};
function getReverb(orbit, duration = 2) {
if (!reverbs[orbit]) {
const ac = getAudioContext();
const reverb = ac.createReverb(duration);
reverb.connect(getDestination());
reverbs[orbit] = reverb;
}
if (reverbs[orbit].duration !== duration) {
reverbs[orbit].setDuration(duration);
}
return reverbs[orbit];
}
function effectSend(input, effect, wet) { function effectSend(input, effect, wet) {
const send = gainNode(wet); const send = gainNode(wet);
input.connect(send); input.connect(send);
@ -260,6 +275,8 @@ export const webaudioOutput = async (hap, deadline, hapDuration) => {
cut, cut,
loop, loop,
orbit = 1, orbit = 1,
room,
size = 2,
} = 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
@ -386,12 +403,18 @@ export const webaudioOutput = async (hap, deadline, hapDuration) => {
const delyNode = getDelay(orbit, delaytime, delayfeedback, t); const delyNode = getDelay(orbit, delaytime, delayfeedback, t);
delaySend = effectSend(post, delyNode, delay); delaySend = effectSend(post, delyNode, delay);
} }
// reverb
let reverbSend;
if (room > 0 && size > 0) {
const reverbNode = getReverb(orbit, size);
reverbSend = effectSend(post, reverbNode, room);
}
// connect chain elements together // connect chain elements together
chain.slice(1).reduce((last, current) => last.connect(current), chain[0]); chain.slice(1).reduce((last, current) => last.connect(current), chain[0]);
// disconnect all nodes when source node has ended: // disconnect all nodes when source node has ended:
chain[0].onended = () => chain.concat([delaySend]).forEach((n) => n?.disconnect()); chain[0].onended = () => chain.concat([delaySend, reverbSend]).forEach((n) => n?.disconnect());
} catch (e) { } catch (e) {
console.warn('.out error:', e); console.warn('.out error:', e);
} }