40 lines
1.1 KiB
JavaScript
40 lines
1.1 KiB
JavaScript
|
const instrumentMap = require('./instrument_map.js')
|
||
|
|
const percussionMap = require('./percussion_map.js')
|
||
|
|
|
||
|
|
function convertNote (track, note) {
|
||
|
|
let instrument = null
|
||
|
|
|
||
|
|
const instrumentList = instrumentMap[track.instrument.number]
|
||
|
|
if (instrumentList != null) {
|
||
|
|
for (const candidateInstrument of instrumentList) {
|
||
|
|
if (note.midi >= candidateInstrument.offset && note.midi <= candidateInstrument.offset + 24) {
|
||
|
|
instrument = candidateInstrument
|
||
|
|
break
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (instrument == null) return null
|
||
|
|
|
||
|
|
const pitch = note.midi - instrument.offset
|
||
|
|
const time = Math.floor(note.time * 1000)
|
||
|
|
|
||
|
|
return { time, instrument: instrument.name, pitch, volume: note.velocity }
|
||
|
|
}
|
||
|
|
|
||
|
|
function convertPercussionNote (track, note) {
|
||
|
|
if (note.midi < percussionMap.length) {
|
||
|
|
const mapEntry = percussionMap[note.midi]
|
||
|
|
if (mapEntry == null) return
|
||
|
|
|
||
|
|
const { pitch, instrument } = mapEntry
|
||
|
|
const time = Math.floor(note.time * 1000)
|
||
|
|
|
||
|
|
return { time, instrument: instrument.name, pitch, volume: note.velocity }
|
||
|
|
}
|
||
|
|
|
||
|
|
return null
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = { convertNote, convertPercussionNote }
|