65 lines
1.2 KiB
JavaScript
65 lines
1.2 KiB
JavaScript
const nbs = require('./nbs_file')
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const instrumentNames = [
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'harp',
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'bass',
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'basedrum',
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'snare',
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'hat',
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'guitar',
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'flute',
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'bell',
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'chime',
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'xylophone',
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'iron_xylophone',
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'cow_bell',
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'didgeridoo',
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'bit',
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'banjo',
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'pling'
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]
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function convertNBS (buf) {
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const parsed = nbs.parse(buf)
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const song = {
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name: parsed.songName,
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notes: [],
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loop: false,
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loopPosition: 0,
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length: 0
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}
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if (parsed.loop > 0) {
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song.loop = true
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song.loopPosition = parsed.loopStartTick
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}
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for (const note of parsed.nbsNotes) {
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let instrument = note.instrument
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if (note.instrument < instrumentNames.length) {
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instrument = instrumentNames[note.instrument]
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} else continue
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let key = note.key
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while (key < 33) key += 12;
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while (key > 57) key -= 12;
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const layerVolume = 100
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// will add layer volume later
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const time = tickToMs(note.tick, parsed.tempo)
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song.length = Math.max(song.length, time)
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song.notes.push({
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instrument,
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pitch: key - 33,
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volume: note.velocity * layerVolume / 10000,
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time
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})
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}
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return song
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}
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function tickToMs (tick = 1, tempo) {
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return Math.floor(1000 * tick * 100 / tempo)
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}
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module.exports = convertNBS
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