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getFreq + midi2note helpers

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This commit is contained in:
Felix Roos 2022-07-28 23:55:17 +02:00
parent ce4d2c17a7
commit fd61001b4d
1 changed files with 13 additions and 0 deletions
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13
packages/core/util.mjs
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@ -31,6 +31,19 @@ export const fromMidi = (n) => {
return Math.pow(2, (n - 69) / 12) * 440;
};
export const getFreq = (noteOrMidi) => {
if (typeof noteOrMidi === 'number') {
return fromMidi(noteOrMidi);
}
return fromMidi(toMidi(noteOrMidi));
};
export const midi2note = (n) => {
const oct = Math.floor(n / 12) - 1;
const pc = ['C', 'Db', 'D', 'Eb', 'E', 'F', 'Gb', 'G', 'Ab', 'A', 'Bb', 'B'][n % 12];
return pc + oct;
};
// modulo that works with negative numbers e.g. mod(-1, 3) = 2
// const mod = (n: number, m: number): number => (n < 0 ? mod(n + m, m) : n % m);
export const mod = (n, m) => ((n % m) + m) % m;