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Shogan/quantize.js

Created September 3, 2021 20:32
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convert aisatana MIDI notes to 32 x phrases as alda compatible strings
Raw
quantize.js
// the Aisatana track MIDI notes
const notes = [
{
"name": "E3",
"midi": 52,
"time": 0,
"velocity": 0.30708661417322836,
"duration": 0.5882355
},
{
"name": "G3",
"midi": 55,
"time": 0.5882355,
"velocity": 0.31496062992125984,
"duration": 0.5882355
},
{
"name": "C3",
"midi": 48,
"time": 1.176471,
"velocity": 0.2992125984251969,
"duration": 0.5882354999999999
},
{
"name": "C4",
"midi": 60,
"time": 1.7647065,
"velocity": 0.33858267716535434,
"duration": 7.6470615
},
{
"name": "E3",
"midi": 52,
"time": 9.411768,
"velocity": 0.30708661417322836,
"duration": 0.5882354999999997
},
{
"name": "G3",
"midi": 55,
"time": 10.0000035,
"velocity": 0.31496062992125984,
"duration": 0.5882354999999997
},
{
"name": "C3",
"midi": 48,
"time": 10.588239,
"velocity": 0.2992125984251969,
"duration": 0.5882354999999997
},
{
"name": "C4",
"midi": 60,
"time": 11.1764745,
"velocity": 0.33858267716535434,
"duration": 0.5882354999999997
},
{
"name": "B3",
"midi": 59,
"time": 11.76471,
"velocity": 0.3228346456692913,
"duration": 2.3529420000000005
},
{
"name": "E4",
"midi": 64,
"time": 14.117652,
"velocity": 0.15748031496062992,
"duration": 4.705884000000001
},
{
"name": "E3",
"midi": 52,
"time": 18.823536,
"velocity": 0.30708661417322836,
"duration": 0.5882354999999997
},
{
"name": "G3",
"midi": 55,
"time": 19.4117715,
"velocity": 0.31496062992125984,
"duration": 0.5882354999999997
},
{
"name": "C3",
"midi": 48,
"time": 20.000007,
"velocity": 0.2992125984251969,
"duration": 0.5882354999999997
},
{
"name": "C4",
"midi": 60,
"time": 20.5882425,
"velocity": 0.33858267716535434,
"duration": 0.5882354999999997
},
{
"name": "B3",
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"time": 21.176478,
"velocity": 0.3228346456692913,
"duration": 7.058826
},
{
"name": "E3",
"midi": 52,
"time": 28.235304,
"velocity": 0.30708661417322836,
"duration": 0.5882354999999997
},
{
"name": "G3",
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},
{
"name": "C3",
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},
{
"name": "C4",
"midi": 60,
"time": 30.0000105,
"velocity": 0.33858267716535434,
"duration": 0.5882354999999997
},
{
"name": "B3",
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"time": 30.588245999999998,
"velocity": 0.3228346456692913,
"duration": 1.1764709999999994
},
{
"name": "E4",
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"time": 31.764716999999997,
"velocity": 0.31496062992125984,
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},
{
"name": "E4",
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},
{
"name": "E3",
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"velocity": 0.30708661417322836,
"duration": 0.29411774999999807
},
{
"name": "E4",
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"time": 38.23530749999999,
"velocity": 0.30708661417322836,
"duration": 0.5882355000000032
},
{
"name": "G3",
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},
{
"name": "D4",
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},
{
"name": "C3",
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"velocity": 0.2992125984251969,
"duration": 0.5882355000000032
},
{
"name": "C4",
"midi": 60,
"time": 39.4117785,
"velocity": 0.2992125984251969,
"duration": 7.6470614999999995
},
{
"name": "E3",
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"duration": 7.6470614999999995
},
{
"name": "E4",
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"time": 47.05884,
"velocity": 0.30708661417322836,
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},
{
"name": "G3",
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"velocity": 0.30708661417322836,
"duration": 0.29411774999999807
},
{
"name": "E4",
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"time": 47.64707549999999,
"velocity": 0.30708661417322836,
"duration": 0.5882355000000032
},
{
"name": "E3",
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"velocity": 0.30708661417322836,
"duration": 0.5882355000000032
},
{
"name": "D4",
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"velocity": 0.30708661417322836,
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},
{
"name": "C3",
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"velocity": 0.2992125984251969,
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},
{
"name": "C4",
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"time": 48.8235465,
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"duration": 0.5882355000000032
},
{
"name": "E3",
"midi": 52,
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"duration": 7.6470614999999995
},
{
"name": "B3",
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{
"name": "E4",
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{
"name": "E4",
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"velocity": 0.30708661417322836,
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},
{
"name": "C4",
"midi": 60,
"time": 56.470608,
"velocity": 0.30708661417322836,
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},
{
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{
"name": "E3",
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},
{
"name": "D4",
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"velocity": 0.30708661417322836,
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},
{
"name": "C3",
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"time": 57.647079,
"velocity": 0.2992125984251969,
"duration": 0.5882355000000032
},
{
"name": "C4",
"midi": 60,
"time": 58.2353145,
"velocity": 0.2992125984251969,
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},
{
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{
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},
{
"name": "D3",
"midi": 50,
"time": 58.823550000000004,
"velocity": 0.30708661417322836,
"duration": 7.058826000000003
},
{
"name": "E4",
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"duration": 0.29411774999999807
},
{
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{
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{
"name": "G3",
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},
{
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{
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{
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{
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{
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{
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{
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{
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]
const groupBy = key => array =>
array.reduce((objectsByKeyValue, obj) => {
const value = obj[key];
objectsByKeyValue[value] = (objectsByKeyValue[value] || []).concat(obj);
return objectsByKeyValue;
}, {});
// constants specific to the aisatana track...
const secPerHalfBeat = 0.294117647058824;
const phraseHalfBeats = 32;
// array to store quantized phrases
let phrases = [];
notes.forEach(n => {
const halfBeat = Math.round(n.time / secPerHalfBeat);
const phraseIndex = Math.floor(halfBeat / phraseHalfBeats);
const note = n.name.substring(0, 1).toLowerCase();
const octave = n.name.substring(1, 2);
const time = n.time;
const duration = n.duration;
// store note in correct 'phrase'
if (!phrases[phraseIndex]) {
phrases[phraseIndex] = [];
}
phrases[phraseIndex].push({ note: note, octave: octave, time: time, duration: duration });
});
// go through each 'phrase' and group notes into their respective chords under the array 'chords' for each phrase
// (if a note is played at the same timestamp, then it belongs to the same chord).
phrases.forEach(phrase => {
let chords = []
const groupByTime = groupBy('time');
phrase.chords = [];
const chordGrouping = groupByTime(phrase);
for (let [chordTimestamp, notes] of Object.entries(chordGrouping)) {
phrase.chords.push(notes)
}
});
phrases.forEach(phrase => {
let aldaStr = "piano: (tempo 51) (quant 90) ";
phrase.chords.forEach(chord => {
if (chord.length > 1) {
// Alda plays notes together as a chord when separated by a '/'
// character. Generate the alda string based on whether or not
// it needs to have multiple notes in the chord, separating with
// '/' if so.
for (let [idx, note] of Object.entries(chord)) {
if (idx == chord.length - 1) {
aldaStr += `o${note.octave} ${note.note} ${note.duration}s `;
} else {
aldaStr += `o${note.octave} ${note.note} ${note.duration}s / `;
}
};
} else {
chord.forEach(note => {
aldaStr += `o${note.octave} ${note.note} ${note.duration}s `;
});
}
});
// Output the phrase as an alda-compatible / playable string (you can
// also copy this directly into alda's REPL to play it)
console.log(aldaStr);
})
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