Created
November 24, 2016 08:06
-
-
Save samhann/4da17b78b8336b1d5ecadd0517db52fb to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
from midiutil.MidiFile import MIDIFile | |
from random import randint | |
from random import randrange | |
class MIDIGenerator(object): | |
def __init__(self,fileName): | |
self.outputFileName = fileName | |
self.MIDIObject = MIDIFile(1) | |
self.track = 0 | |
self.MIDIObject.addTrackName(self.track,0,"Sample Track") | |
self.MIDIObject.addTempo(self.track,0,850) | |
self.volume = 100 | |
self.channel = 0 | |
self.notes = ['C','C#','D','D#','E','F','F#','G','G#','A','A#','B'] | |
self.basePitchOfC = 50 | |
def addNote(self,note,time,duration,octave): | |
if note != "S": | |
self.MIDIObject.addNote(self.track,self.channel,self.notePitch(note,octave),time,duration,self.volume) | |
else: | |
self.MIDIObject.addNote(self.track,self.channel,50,time,duration,0) | |
def addChord(self,notes,time,duration): | |
for noteInfo in notes: | |
note = noteInfo[0] | |
octave = noteInfo[1] | |
self.MIDIObject.addNote(self.track,self.channel,self.notePitch(note,octave),time,duration,self.volume) | |
def notePitch(self,note,octave): | |
return self.notes.index(note) + self.basePitchOfC + (12 * octave) | |
def addMelody(self,melody): | |
trackTime = 0 | |
for noteInfo in melody: | |
note = noteInfo[0] | |
octave = noteInfo[1] | |
duration = noteInfo[2] | |
if(note != ''): | |
self.addNote(note,trackTime,duration,octave) | |
trackTime = trackTime + duration | |
def writeMidiToFile(self): | |
binfile = open(self.outputFileName, 'wb') | |
self.MIDIObject.writeFile(binfile) | |
binfile.close() | |
class Composer(object): | |
def compose(self,scaleNotes,rhythmIntervals,duration): | |
scaleLen = len(scaleNotes) | |
counter = 0 | |
melody = [] | |
octave = 2 | |
counter = 0 | |
octaveOffset = 0 | |
multiplier = randint(2,1000) | |
noteCounter = randint(1,5000) | |
base = randint(1,1000) | |
cycle_length = 2**randint(2,4) | |
while counter < duration: | |
#switch things up every now and then | |
if counter % cycle_length == 0: | |
multiplier = randint(2,1000) | |
noteCounter = randint(1,5000) | |
base = randint(1,1000) | |
cycle_length = 2**randint(2,4) | |
noteOffset = generateNoteDelta(noteCounter+counter,multiplier,base) | |
# extend durations by even multiples every now and then | |
noteDuration = rhythmIntervals[counter % len(rhythmIntervals)] * (2**randint(1,2)) | |
# some random silences | |
if counter % 2**randint(2,4) == 0: | |
if len(melody) >= 1: | |
last = melody.pop() | |
melody.append((last[0],last[1],last[2]+noteDuration + randint(0,1))) | |
#melody.append(("S",octave + octaveOffset,noteDuration)) | |
else: | |
melody.append((scaleNotes[noteOffset % scaleLen],octave + octaveOffset,noteDuration)) | |
counter = counter + 1 | |
return melody | |
def numberToBase(n, b): | |
if n == 0: | |
return [0] | |
digits = [] | |
while n: | |
digits.append(int(n % b)) | |
n /= b | |
return digits[::-1] | |
def sumOfDigits(num): | |
result = 0 | |
for digit in num: | |
result = result + int(digit) | |
return result | |
def generateNoteDelta(counter,base,multiplier): | |
return sumOfDigits(numberToBase((counter * multiplier),base)) | |
def composeAndWriteToFile(scale,intervals,duration,fileName): | |
mozart = Composer() | |
testMelody = mozart.compose(scale,intervals,duration) | |
MIDIGen = MIDIGenerator(fileName) | |
MIDIGen.addMelody(testMelody) | |
MIDIGen.writeMidiToFile() | |
intervals = [1,1,2,1,1,2]; | |
majorScaleNotes = ['C','D','E','F','G','A'] | |
pentatonic = ['C','D','E','G','A'] | |
bluesScaleNotes = ['C','D#','F','F#','A#'] | |
arabScaleNotes = ['C','C#','E','F','G','G#','B'] | |
composeAndWriteToFile(majorScaleNotes,intervals,500,"nyancat.mid") |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment