#!/usr/bin/env python
import os
import random
import sys
import time
random.seed(time.time())
import parse
def main():
key = "A"
note_grammars = {
"u": ["I V V V I I IV u u", "I IV u u", "I VII IV u u" , "e"],
"e": [""],
}
chord_grammars = {
"u": ['"I" "IV" "V" "IV" "I" u u', '"I" "VII" "IV" u u', '"I" "V" "IV" u u', "e"],
"e": [""]
}
compose_piece(key, note_grammars)
compose_piece(key, chord_grammars, chords=True)
def compose_piece(key, grammars, chords=False):
score = ""
while len(score.split()) < 10:
score = "u u u"
score = generate_score(score, grammars)
score = parse.parse(score)
score = transliterate_score(score, key, chords)
score = generate_csound_score(score)
print "f1 0 256 10 1 0 3 ; sine wave function table"
for line in score:
print line
def make_scale(key):
notes = ["A", "A#", "B", "C", "C#", "D", "D#", "E", "F", "F#", "G", "G#"]
scale = [key]
pos = notes.index(key)
progression = [2,2,1,2,2,2,1]
for p in progression:
pos = (pos + p) % 12
scale.append(notes[pos])
return scale
def generate_score(score, grammars):
while 1:
found_substitution = False
for key,value in grammars.iteritems():
if score.find(key) != -1:
found_substitution = True
while score.find(key) != -1:
score = score.replace(key, random.choice(grammars[key]), 1)
if len(score) > 200:
score = score.replace("u", "")
score = score.replace("e", "")
return score
if found_substitution is False:
break
return score
def transliterate_score(score, key, chords=False):
scale = make_scale(key)
scale_conversion = {
"I": 1,
"II": 2,
"III": 3,
"IV": 4,
"V": 5,
"VI": 6,
"VII": 7,
"VIII": 8,
}
keyed_score = []
if chords is False:
for i in range(len(score)):
score[i].value = scale[scale_conversion[score[i].value]-1]
else:
for i in range(len(score)):
chord = []
root_note_index = scale.index(key) + scale_conversion[score[i].value]
chord.append(scale[root_note_index])
chord.append(scale[(root_note_index+3) % 8])
chord.append(scale[(root_note_index+5) % 8])
score[i].chord = chord
return score
def generate_csound_score(score):
csound_note_values = {
"C": "00",
"C#": "01",
"D": "02",
"D#": "03",
"E": "04",
"F": "05",
"F#": "06",
"G": "07",
"G#": "08",
"A": "09",
"A#": "10",
"B": "11",
}
t = 0
csound_score = []
for token in score:
if isinstance(token, parse.Chord): # Chords
for note in token.chord:
note = csound_note_values[note]
csound_score.append("i2 %(time)f 1 7000 %(octave)d.%(note)s %(octave)d.%(note)s 0 6" % {"time": t, "octave": random.choice([7,8]), "note": note})
t += 1
else: # Individual notes
note = csound_note_values[token.value]
csound_score.append("i2 %(time)f 1 7000 %(octave)d.%(note)s %(octave)d.%(note)s 0 6" % {"time": t, "octave": random.choice([8,9]), "note": note})
t += .25
return csound_score
if __name__ == "__main__": main()