38 lines
1.1 KiB
JavaScript
38 lines
1.1 KiB
JavaScript
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const { Midi } = require('@tonejs/midi')
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const { convertNote, convertPercussionNote } = require('./convert_note.js')
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function convertMidi (midi) {
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if (!(midi instanceof Midi)) throw new TypeError('midi must be an instance of require(\'@tonejs/midi\').Midi')
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let noteList = []
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for (const track of midi.tracks) {
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for (const note of track.notes) {
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const mcNote = (track.instrument.percussion ? convertPercussionNote : convertNote)(track, note)
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if (mcNote != null) {
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noteList.push(mcNote)
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}
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}
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}
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noteList = noteList.sort((a, b) => a.time - b.time)
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// It might be better to move some of this code to the converting loop (for performance reasons)
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let maxVolume = 0.001
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for (const note of noteList) {
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if (note.volume > maxVolume) maxVolume = note.volume
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}
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for (const note of noteList) {
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note.volume /= maxVolume
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}
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let songLength = 0
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for (const note of noteList) {
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if (note.time > songLength) songLength = note.time
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}
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return { name: midi.header.name, notes: noteList, loop: false, loopPosition: 0, length: songLength }
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}
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module.exports = { convertMidi, convertNote, convertPercussionNote }
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