@tonaljs/midi/dist/index.mjs

Functions to work with midi numbers

// index.ts
import { note as props } from "@tonaljs/pitch-note";
function isMidi(arg) {
  return +arg >= 0 && +arg <= 127;
}
function toMidi(note) {
  if (isMidi(note)) {
    return +note;
  }
  const n = props(note);
  return n.empty ? null : n.midi;
}
function midiToFreq(midi, tuning = 440) {
  return Math.pow(2, (midi - 69) / 12) * tuning;
}
var L2 = Math.log(2);
var L440 = Math.log(440);
function freqToMidi(freq) {
  const v = 12 * (Math.log(freq) - L440) / L2 + 69;
  return Math.round(v * 100) / 100;
}
var SHARPS = "C C# D D# E F F# G G# A A# B".split(" ");
var FLATS = "C Db D Eb E F Gb G Ab A Bb B".split(" ");
function midiToNoteName(midi, options = {}) {
  if (isNaN(midi) || midi === -Infinity || midi === Infinity) return "";
  midi = Math.round(midi);
  const pcs = options.sharps === true ? SHARPS : FLATS;
  const pc = pcs[midi % 12];
  if (options.pitchClass) {
    return pc;
  }
  const o = Math.floor(midi / 12) - 1;
  return pc + o;
}
function chroma(midi) {
  return midi % 12;
}
function pcsetFromChroma(chroma2) {
  return chroma2.split("").reduce((pcset2, val, index) => {
    if (index < 12 && val === "1") pcset2.push(index);
    return pcset2;
  }, []);
}
function pcsetFromMidi(midi) {
  return midi.map(chroma).sort((a, b) => a - b).filter((n, i, a) => i === 0 || n !== a[i - 1]);
}
function pcset(notes) {
  return Array.isArray(notes) ? pcsetFromMidi(notes) : pcsetFromChroma(notes);
}
function pcsetNearest(notes) {
  const set = pcset(notes);
  return (midi) => {
    const ch = chroma(midi);
    for (let i = 0; i < 12; i++) {
      if (set.includes(ch + i)) return midi + i;
      if (set.includes(ch - i)) return midi - i;
    }
    return void 0;
  };
}
function pcsetSteps(notes, tonic) {
  const set = pcset(notes);
  const len = set.length;
  return (step) => {
    const index = step < 0 ? (len - -step % len) % len : step % len;
    const octaves = Math.floor(step / len);
    return set[index] + octaves * 12 + tonic;
  };
}
function pcsetDegrees(notes, tonic) {
  const steps = pcsetSteps(notes, tonic);
  return (degree) => {
    if (degree === 0) return void 0;
    return steps(degree > 0 ? degree - 1 : degree);
  };
}
var index_default = {
  chroma,
  freqToMidi,
  isMidi,
  midiToFreq,
  midiToNoteName,
  pcsetNearest,
  pcset,
  pcsetDegrees,
  pcsetSteps,
  toMidi
};
export {
  chroma,
  index_default as default,
  freqToMidi,
  isMidi,
  midiToFreq,
  midiToNoteName,
  pcset,
  pcsetDegrees,
  pcsetNearest,
  pcsetSteps,
  toMidi
};
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