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poc: render pattern audio with node script

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Felix Roos 2025-06-05 11:04:55 +02:00
parent f0e6c5483c
commit ccec7e725a
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6 changed files with 81 additions and 12 deletions
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15
packages/superdough/dough.mjs
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@ -1,12 +1,12 @@
// this is dough, the superdough without dependencies
const ISR = 1 / sampleRate;
const SAMPLE_RATE = typeof sampleRate !== 'undefined' ? sampleRate : 48000;
const ISR = 1 / SAMPLE_RATE;
// https://garten.salat.dev/audio-DSP/oscillators.html
export class SineOsc {
phase = 0;
update(freq) {
const value = Math.sin(this.phase * 2 * Math.PI);
this.phase = (this.phase + freq / sampleRate) % 1;
this.phase = (this.phase + freq / SAMPLE_RATE) % 1;
return value;
}
}
@ -39,7 +39,7 @@ export class SawOsc {
//phase = Math.random();
phase = 0;
update(freq) {
const dt = freq / sampleRate;
const dt = freq / SAMPLE_RATE;
let p = polyBlep(this.phase, dt);
let s = 2 * this.phase - 1 - p;
this.phase += dt;
@ -216,12 +216,12 @@ const MAX_DELAY_TIME = 10;
export class Delay {
writeIdx = 0;
readIdx = 0;
buffer = new Float32Array(MAX_DELAY_TIME * sampleRate); // .fill(0)
buffer = new Float32Array(MAX_DELAY_TIME * SAMPLE_RATE); // .fill(0)
write(s, delayTime) {
this.writeIdx = (this.writeIdx + 1) % this.buffer.length;
this.buffer[this.writeIdx] = s;
// Calculate how far in the past to read
let numSamples = Math.min(Math.floor(sampleRate * delayTime), this.buffer.length - 1);
let numSamples = Math.min(Math.floor(SAMPLE_RATE * delayTime), this.buffer.length - 1);
this.readIdx = this.writeIdx - numSamples;
// If past the start of the buffer, wrap around
if (this.readIdx < 0) this.readIdx += this.buffer.length;
@ -501,7 +501,7 @@ export class Dough {
r = 0; // tbd
t = 0;
// sampleRate: number, currentTime: number (seconds)
constructor(sampleRate, currentTime) {
constructor(sampleRate = 48000, currentTime = 0) {
this.sampleRate = sampleRate;
this.t = Math.floor(currentTime * sampleRate); // samples
// console.log('init dough', this.sampleRate, this.t);
@ -513,6 +513,7 @@ export class Dough {
if (value._duration === undefined) {
throw new Error('[dough]: scheduleSpawn expected _duration to be set');
}
value.sampleRate = this.sampleRate;
const time = value._begin; // set from supradough.mjs
this.schedule({ time, type: 'spawn', arg: value });
}