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

supports old documented way of loading wavetables:

Browse source
This commit is contained in:
Jade (Rose) Rowland 2025-09-27 15:22:54 -04:00
parent a9957b45e5
commit 626a99ba5b
3 changed files with 40 additions and 42 deletions
Download patch file Download diff file Expand all files Collapse all files

33
packages/superdough/sampler.mjs
View file

@ -1,4 +1,4 @@
import { noteToMidi, valueToMidi, getSoundIndex } from './util.mjs';
import { noteToMidi, valueToMidi, getSoundIndex, getCommonSampleInfo } from './util.mjs';
import { getAudioContext, registerSound, registerWaveTable } from './index.mjs';
import { getADSRValues, getParamADSR, getPitchEnvelope, getVibratoOscillator } from './helpers.mjs';
import { logger } from './logger.mjs';
@ -22,39 +22,16 @@ function humanFileSize(bytes, si) {
return bytes.toFixed(1) + ' ' + units[u];
}
// deduces relevant info for sample loading from hap.value and sample definition
// it encapsulates the core sampler logic into a pure and synchronous function
// hapValue: Hap.value, bank: sample bank definition for sound "s" (values in strudel.json format)
export function getSampleInfo(hapValue, bank) {
const { s, n = 0, speed = 1.0 } = hapValue;
let midi = valueToMidi(hapValue, 36);
let transpose = midi - 36; // C3 is middle C;
let sampleUrl;
let index = 0;
if (Array.isArray(bank)) {
index = getSoundIndex(n, bank.length);
sampleUrl = bank[index];
} else {
const midiDiff = (noteA) => noteToMidi(noteA) - midi;
// object format will expect keys as notes
const closest = Object.keys(bank)
.filter((k) => !k.startsWith('_'))
.reduce(
(closest, key, j) => (!closest || Math.abs(midiDiff(key)) < Math.abs(midiDiff(closest)) ? key : closest),
null,
);
transpose = -midiDiff(closest); // semitones to repitch
index = getSoundIndex(n, bank[closest].length);
sampleUrl = bank[closest][index];
}
const label = `${s}:${index}`;
const { speed = 1.0 } = hapValue;
const {transpose, url, index, midi, label} = getCommonSampleInfo(hapValue, bank)
let playbackRate = Math.abs(speed) * Math.pow(2, transpose / 12);
return { transpose, sampleUrl, index, midi, label, playbackRate };
return { transpose, url, index, midi, label, playbackRate };
}
// takes hapValue and returns buffer + playbackRate.
export const getSampleBuffer = async (hapValue, bank, resolveUrl) => {
let { sampleUrl, label, playbackRate } = getSampleInfo(hapValue, bank);
let { url: sampleUrl, label, playbackRate } = getSampleInfo(hapValue, bank);
if (resolveUrl) {
sampleUrl = await resolveUrl(sampleUrl);
}