きのくにやPiano

rentaro.groovy

import javax.sound.midi.*

//thx to https://gist.github.com/250489
int ticks = 16
def addNote(track, pitch, start, duration=ticks, velocity=64) {
    message = new ShortMessage()
    message.setMessage(ShortMessage.NOTE_ON, pitch, velocity)
    track.add(new MidiEvent(message, start))
    message = new ShortMessage()
    message.setMessage(ShortMessage.NOTE_OFF, pitch, velocity)
    track.add(new MidiEvent(message, start + duration))
    return start + duration
}
def instChange(track, instNo=0) {
  message = new ShortMessage()
  message.setMessage(ShortMessage.PROGRAM_CHANGE, 0, instNo, 0)
  track.add(new MidiEvent(message, 0))
}
//
def noteArray = ['C','C#','D','D#','E','F','F#','G','G#','A','A#','B']
def octArray = [-36,-24,-12,0,12,24,36]
def dur = ["1":64,"2":32,"2.":48,"4":16,"4.":24,"8":8,"8.":12,"16":1,,"16.":3]

def toNoteNum = {notesStr->
    def notes =  notesStr.split(' ')
    def octave,note,snum,noteNums = []
    notes.each{
        def sp = it.split('/')
        def n = sp[0],d="4"
        if(sp.size()==2){ d=sp[1] }
        note = n[0..n.length()-2]
        if(note=='n'){
            snum=null
        }else{
            snum= 60 + octArray[(n[n.length()-1..-1]) as int] + noteArray.indexOf(note)
        }
        noteNums << [snum, dur[d]]
    }
    return noteNums
}
def player = {score,bpm->
    def nums = toNoteNum score
    def seq = new Sequence(Sequence.PPQ, ticks)
    def track = seq.createTrack()
    instChange(track, 1)
    int t = 0
    nums.each{pitch, duration->
        t = pitch ? addNote(track, pitch, t, duration) : t + duration
    }
    MidiSystem.sequencer.with{
        tempoInBPM = bpm
        sequence = seq
        open()
        start()
        while(isRunning())Thread.sleep(1000)
        close()
    }
}
if(args){
    player args[0], 70.0
}else{
    println 'usage: groovy rentaro.groovy "C3/4. C3/8 E3/4. E3/8 G3/8. G3/16 G3/4 C4/4 A3/8. A3/16 G3/4 n/4"'
}
/*
groovy rentaro.groovy "n/2 E4/4 F#4/4 G#4/1 E4/4 F#4/4 G#4/1 E4/4 F#4/4 G#4/2 G#4/4 A4/4 B4/2 G#4/2 F#4/2 E4/2 C#5/4 C#5/4 C#5/4 A4/4 F#4/4 F#4/4 G#4/4 A4/4 B4/4 B4/4 B4/4 G#4/4 E4/2. G#4/4 A4/2 C#4/2 E4/4 D#4/4 C#4/4 D#4/4 E4/1 G#4/4 A4/2 C#4/2 E4/4. D#4/4. C#4/4. D#4/2 E4/1"
*/