rtmidi/compose/midicompose.py

#!/usr/bin/python

from simplemidi.midiparser import *
from simplemidi.midiplayer import *
import os
"""
md=MIDIHeaderChunk()
md.length=6
md.format=MIDIHeaderChunk.FORMAT_MULTIPLE_CHANNEL
md.tracks=5
md.division=960

mt=MIDITrackChunk()
mt.addNote(0.5, 60)
mt.addNote(0.5, 63)
mt.addNote(1, 63)
mt.addNote(0.25, 63)

f=open("test", "wb")
print(f)
md.write(f)
mt.write(f)
f.close()
"""
from simplemidi.alsaconnector import AlsaConnector, AlsaPort
from random import randint
os.sched_setscheduler(os.getpid(), os.SCHED_FIFO, os.sched_param(1))
class Compose:
    _DEFAULT_PARAM={
        'keys' : [57, 59,60,62,64,65,67],
        "times": [ [0.5,4], [1,4], [1.5, 1]]
    }

    def __init__(self, param=_DEFAULT_PARAM):
        self.track = MIDITrackChunk()
        keys=param["keys"] if "keys" in param else Compose._DEFAULT_PARAM["keys"]
        self.keys=[]
        for i in keys: self.keys.append((i, randint(0,10)))
        self.times=param["times"] if "times" in param else Compose._DEFAULT_PARAM["times"]

        temps=64
        while temps>0:
            x=self.randTime(temps)
            k=self.randKey()
            self.track.addNote(x, k)
            temps-=x
        print("Mesure: "+str(8-temps))

    def randTime(self, max):
        x=0
        for i in self.times: x+=i[1] if len(i)>1 and i[1]<=max else 1
        dice=randint(0,x-1)
        for i in self.times:
            if i[1]<=max:
                dice-=i[1]
            if dice<=0: return i[0]
        return self.times[0][0]

    def randKey(self):
        x = 0
        for i in self.keys: x += i[1] if len(i) > 1 else 1
        dice = randint(0, x - 1)
        for i in self.keys:
            dice -= i[1]
            if dice <= 0: return i[0]
        return self.keys[0][0]


    def play(self):
        self.file=MidiFile()

        self.file.tracks=[self.track.events]
        mp=MidiPlayer(self.file)
        #mp.setBpmRatio(2)
        AlsaConnector.connect((133,0), (130,0))
        #input("...")
        mp.port.send(Stop())
        mp.port.send(Continue())
        mp.port.send(Start())
        while True:
            mp.play()
            print("===========")



c=Compose()
c.play()