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package main
import (
"encoding/csv"
"encoding/xml"
"flag"
"fmt"
"io/ioutil"
"math"
"os"
)
const APP_VERSION = "0.1"
var versionFlag *bool = flag.Bool("v", false, "Print the version number.")
var inputFlag *string = flag.String("i", "", "The MusicXML file.")
var outputFlag *string = flag.String("o", "", "The CSV file to generate.")
var partFlag *int = flag.Int("p", 0, "The part to process.")
func init() {
flag.Parse()
if *versionFlag {
fmt.Println("Version:", APP_VERSION)
return
}
if *outputFlag == "" {
*outputFlag = *inputFlag + ".csv"
}
}
/***** MusicXML structure *****/
type XMLFile struct {
Parts []Part `xml:"part"`
}
type Part struct {
Measures []Measure `xml:"measure"`
}
type Measure struct {
Attributes Attributes `xml:"attributes"`
Directions []Direction `xml:"direction"`
Notes []Note `xml:"note"`
}
type Attributes struct {
Divisions int `xml:"divisions"`
}
type Direction struct {
Sound Sound `xml:"sound"`
}
type Sound struct {
Tempo float64 `xml:"tempo,attr"`
}
type Note struct {
Pitch Pitch `xml:"pitch"`
Duration int `xml:"duration"`
}
type Pitch struct {
Step string `xml:"step"`
Alter int `xml:"alter"`
Octave int `xml:"octave"`
}
/***** Note conversion *****/
const REFERENCE_PITCH float64 = 440
var pitchOffset = map[string]int{
"C": -9,
"D": -7,
"E": -5,
"F": -4,
"G": -2,
"A": +0,
"B": +2,
}
func calcFrequency(pitch Pitch) float64 {
if pitch.Step == "" {
return 0
}
return REFERENCE_PITCH * float64(pitch.Octave-3) * math.Pow(2, float64(pitchOffset[pitch.Step]+pitch.Alter)/12)
}
/***** Division calculation *****/
const DEFAULT_DIVISION = 24
func readDivisions(part Part) int {
for _, measure := range part.Measures {
if measure.Attributes.Divisions != 0 {
return measure.Attributes.Divisions
}
}
return DEFAULT_DIVISION
}
/***** Tempo calculation *****/
const DEFAULT_TEMPO = 120
func readTempo(part Part) float64 {
for _, measure := range part.Measures {
for _, direction := range measure.Directions {
if direction.Sound.Tempo != 0 {
return direction.Sound.Tempo
}
}
}
return DEFAULT_TEMPO
}
func calcDuration(noteDuration int, divisions int, tempo float64) float64 {
return 60000 / tempo * float64(noteDuration) / float64(divisions)
}
/***** Main program *****/
func main() {
// read and parse MusicXML file
inputFile, err := os.Open(*inputFlag)
if err != nil {
fmt.Println("Error opening MusicXML file:", err)
return
}
defer inputFile.Close()
data, err := ioutil.ReadAll(inputFile)
if err != nil {
fmt.Println("Error reading MusicXML file:", err)
return
}
var parsed XMLFile
xml.Unmarshal(data, &parsed)
fmt.Println("Parsed data:", parsed)
// create and write to CSV file
outputFile, err := os.Create(*outputFlag)
if err != nil {
fmt.Println("Error creating CSV file:", err)
return
}
defer outputFile.Close()
writer := csv.NewWriter(outputFile)
defer writer.Flush()
if *partFlag >= len(parsed.Parts) {
fmt.Println("Error: part", *partFlag, "does not exist.")
return
}
part := parsed.Parts[*partFlag]
tempo := readTempo(part)
fmt.Println("Tempo:", tempo)
divisions := readDivisions(part)
fmt.Println("Divisions:", divisions)
for _, measure := range part.Measures {
for _, note := range measure.Notes {
pitch := calcFrequency(note.Pitch)
duration := calcDuration(note.Duration, divisions, tempo)
line := []string{fmt.Sprint(pitch), fmt.Sprint(duration)}
fmt.Println(line)
err := writer.Write(line)
if err != nil {
fmt.Println("Error writing in CSV file:", err)
return
}
}
}
fmt.Println("Done.")
}
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