53 lines
1.5 KiB
JavaScript
53 lines
1.5 KiB
JavaScript
function cleanName(str){
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//ableton adds some weird stuff to the track
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return str.replace(/\u0000/g, '')
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}
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function ticksToSeconds(ticks, header){
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return (60 / header.bpm) * (ticks / header.PPQ);
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}
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function isNumber(val){
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return typeof val === 'number'
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}
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function isString(val){
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return typeof val === 'string'
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}
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const isPitch = (function(){
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const regexp = /^([a-g]{1}(?:b|#|x|bb)?)(-?[0-9]+)/i
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return (val) => {
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return isString(val) && regexp.test(val)
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}
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}())
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function midiToPitch(midi){
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const scaleIndexToNote = ["C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B"];
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const octave = Math.floor(midi / 12) - 1;
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const note = midi % 12;
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return scaleIndexToNote[note] + octave;
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}
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const pitchToMidi = (function(){
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const regexp = /^([a-g]{1}(?:b|#|x|bb)?)(-?[0-9]+)/i
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const noteToScaleIndex = {
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"cbb" : -2, "cb" : -1, "c" : 0, "c#" : 1, "cx" : 2,
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"dbb" : 0, "db" : 1, "d" : 2, "d#" : 3, "dx" : 4,
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"ebb" : 2, "eb" : 3, "e" : 4, "e#" : 5, "ex" : 6,
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"fbb" : 3, "fb" : 4, "f" : 5, "f#" : 6, "fx" : 7,
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"gbb" : 5, "gb" : 6, "g" : 7, "g#" : 8, "gx" : 9,
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"abb" : 7, "ab" : 8, "a" : 9, "a#" : 10, "ax" : 11,
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"bbb" : 9, "bb" : 10, "b" : 11, "b#" : 12, "bx" : 13,
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}
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return (note) => {
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const split = regexp.exec(note)
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const pitch = split[1]
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const octave = split[2]
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const index = noteToScaleIndex[pitch.toLowerCase()]
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return index + (parseInt(octave) + 1) * 12
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}
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}())
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module.exports = {cleanName, ticksToSeconds, isString, isNumber, isPitch, midiToPitch, pitchToMidi} |