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This commit is contained in:
Jade (Rose) Rowland 2023-12-23 12:30:55 -05:00
parent 466574a856
commit 3776791239
3 changed files with 17 additions and 7 deletions
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10
packages/superdough/sampler.mjs
View file

@ -1,4 +1,4 @@
import { noteToMidi, valueToMidi, nanFallback } from './util.mjs';
import { noteToMidi, valueToMidi, getSoundIndex } from './util.mjs';
import { getAudioContext, registerSound } from './index.mjs';
import { getEnvelope } from './helpers.mjs';
import { logger } from './logger.mjs';
@ -31,10 +31,11 @@ export const getSampleBufferSource = async (s, n, note, speed, freq, bank, resol
transpose = midi - 36; // C3 is middle C
const ac = getAudioContext();
let sampleUrl;
if (Array.isArray(bank)) {
n = nanFallback(n, 0);
sampleUrl = bank[n % bank.length];
const index = getSoundIndex(n, bank.length);
sampleUrl = bank[index];
} else {
const midiDiff = (noteA) => noteToMidi(noteA) - midi;
// object format will expect keys as notes
@ -45,7 +46,8 @@ export const getSampleBufferSource = async (s, n, note, speed, freq, bank, resol
null,
);
transpose = -midiDiff(closest); // semitones to repitch
sampleUrl = bank[closest][n % bank[closest].length];
const index = getSoundIndex(n, bank[closest].length);
sampleUrl = bank[closest][index];
}
if (resolveUrl) {
sampleUrl = await resolveUrl(sampleUrl);

7
packages/superdough/util.mjs
View file

@ -61,3 +61,10 @@ export function nanFallback(value, fallback) {
}
return value;
}
// modulo that works with negative numbers e.g. _mod(-1, 3) = 2. Works on numbers (rather than patterns of numbers, as @mod@ from pattern.mjs does)
export const _mod = (n, m) => ((n % m) + m) % m;
// round to nearest int, negative numbers will output a subtracted index
export const getSoundIndex = (n, numSounds) => {
return _mod(Math.round(nanFallback(n, 0)), numSounds);
};