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converter.py
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converter.py
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#!/usr/bin/python
import math
import re
import sys
import os
infile = "score.pyscore"
outfile = "score.cscore"
if len(sys.argv) > 1:
if os.path.isfile(sys.argv[1]):
infile = sys.argv[1]
if ".pyscore" in infile:
outfile = infile.replace(".pyscore", ".cscore")
else:
outfile = sys.argv[1] + ".out"
else:
print("File '%s' does not exist." % sys.argv[1])
exit(1)
if len(sys.argv) > 2:
outfile = sys.argv[2]
# Frequencies for octave 8
basis = [4186.01, 4434.92, 4698.63, 4978.03,
5274.04, 5587.65, 5919.91, 6271.93,
6644.88, 7040.00, 7458.62, 7902.13]
notes_map = {"c": 0, "d": 2, "e": 4, "f": 5, "g": 7, "a": 9, "b": 11}
# Generate a frequency based on a note description
def frequency(note):
base = 0
octave = 0
accidental = None
if len(note) > 0:
base = notes_map[note[0]]
if len(note) > 1:
octave = int(note[1])
if len(note) > 2:
if note[2] == "b":
if len(note) > 3 and note[3] == "b":
accidental = -2
else:
accidental = -1
elif note[2] == "#":
if len(note) > 3 and note[3] == "#":
accidental = 2
else:
accidental = 1
elif note[2] == "x":
accidental = 2
elif note[2] == "n":
accidental = 0
# Handle key signature
if accidental is None:
if note[0].upper() in key:
if "#" in key:
accidental = 1
else:
accidental = -1
else:
accidental = 0
n = base+accidental
if n > 11 or n < 0:
octave += math.floor(n/12)
n %= 12
exponent = 8-octave
return basis[n] / 2**exponent
getsbeat = 4
beats = 4
measure_length = 0
beat_length = 0
quarter_length = 0
measure = 0
key = ""
def meter(m):
global beats, getsbeat
m = m.split("/")
beats = int(m[0].strip())
getsbeat = int(m[1].strip())
print("%i/%i" % (beats, getsbeat))
def tempo(t):
global beat_length, measure_length, quarter_length
names = {"whole": 1, "half": 2, "quarter": 4}
t = t.split("=")
n = names[t[0].strip()]
time = int(t[1].strip())
seconds = 60.0/time # Seconds per n
seconds *= n # Seconds per whole note
beat_length = seconds/getsbeat
measure_length = beat_length * beats
quarter_length = beat_length * 4.0 / getsbeat
print("a measure lasts {0} seconds, a beat {1},\
a quarter {2}".format(measure_length,
beat_length, quarter_length))
def key_gen(t):
global key
flats = "BEADGCF"
sharps = "FCGDAEB"
use = ""
if "b" in t:
use = flats
key = "b"
else:
use = sharps
key = "#"
key += use[:len(t)]
print("Key: " + key[1:] + " " + ("flat" if "b" in key else "sharp"))
note_lengths = {'w': 4, 'h': 2, 'q': 1, 'e': 0.5, 's': 0.25}
def gen_start(s):
time = 0
for item in s.split("+"):
n = re.search("[whqes]", item).group()
# print(n)
n = note_lengths[n]
if "t" in item:
# print(triplet.group())
n *= 2/3.0
count = int(re.search("\d", item).group())
# print(count)
time += (count-1)*n*quarter_length
if time > measure_length:
print("error on line", line_no, " note starts after measure")
time += (measure-1)*measure_length
return time
handlers = ["meter", "tempo", "key"]
handler_functions = {
"meter": meter,
"tempo": tempo,
"key": key_gen
}
values = {}
notes = []
measure_notes = []
repeat_notes = []
repeating = False
was_repeating = False
repeat_offset = 0.0
def finalize_measure():
global measure_notes, notes, repeat_notes, repeat_offset
measure_notes.sort()
notes.extend(measure_notes)
if repeating:
repeat_notes.extend(measure_notes)
repeat_offset += measure_length
elif was_repeating:
rnotes = [(x[0]+repeat_offset, x[1], x[2]) for x in repeat_notes]
notes.extend(rnotes)
repeat_notes = []
measure_notes = []
def handle_measure_mark(line):
global measure, repeating, repeat_offset, was_repeating
finalize_measure()
measure += 1
if "---:" in line and not repeating:
repeating = True
repeat_offset = 0
elif ":---" in line and repeating:
repeating = False
was_repeating = True
line_no = 0
end_time = 0
with open(infile, "r") as f:
###################
# Read the header #
###################
while True:
line = f.readline()
line_no += 1
if len(line) == 0:
exit(0) # EOF
line = line.strip()
if len(line) == 0 or line[0] == "#":
continue # Line is a comment
if "---" in line:
handle_measure_mark(line)
break
if ":" in line:
pair = line.split(":")
values[pair[0].strip()] = pair[1].strip()
##############################
# Process header information #
##############################
for handler in handlers:
# Is there a value that this handler can process?
if handler in values:
handler_functions[handler](values[handler])
####################
# Process the body #
####################
while True:
line_no += 1
line = f.readline().lower()
if line == "":
finalize_measure()
break # EOF
line = line.strip()
if len(line) == 0 or line[0] == "#":
continue # Comment
if "---" in line: # Measure break
handle_measure_mark(line)
continue
if "restart" in line: # Multiple parts
finalize_measure()
measure = 0
continue
line = re.split(r'\s+', line, 1)
if len(line) == 1:
print("error on line {0}: missing notes".format(line_no))
continue
start = line[0]
start_time = gen_start(start)
tokens = line[1]
tokens = tokens.split(",")
for token in tokens:
elements = re.split("\s+", token.strip())
pitch = frequency(elements[0])
# print(elements[0], pitch)
base_note = re.search("[whqes]", elements[1]).group()
base_len = note_lengths[base_note]
if re.search("t", elements[1]):
base_len *= 2/3.0
num_dots = len(re.findall("\.", elements[1]))
note_len = sum([base_len*0.5**x for x in range(num_dots+1)])
note_len *= quarter_length
# print(elements[1], base_len, note_len)
measure_notes.append((start_time, note_len, pitch))
# print(start_time)
notes.sort()
end_time
for note in notes:
start_time, note_len, _ = note
if start_time + note_len > end_time:
end_time = start_time + note_len
end_padding = 1.0
end_time += end_padding
print("%.3f seconds long" % end_time)
with open(outfile, "w") as f:
f.write("%i notes\n" % len(notes))
f.write("%.3f seconds\n\n" % (end_time))
for note in notes:
f.write("%.2f %.3f %.3f\n" % (note[2], note[0], note[1]))