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pysynth_s.py
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pysynth_s.py
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#!/usr/bin/env python
#print "*** KARPLUS-STRONG STRING ***"
"""
##########################################################################
# * * * PySynth * * *
# A very basic audio synthesizer in Python (www.python.org)
#
# Martin C. Doege, 2009-06-13 (mdoege@compuserve.com)
##########################################################################
# Based on a program by Tyler Eaves (tyler at tylereaves.com) found at
# http://mail.python.org/pipermail/python-list/2000-August/041308.html
##########################################################################
# 'song' is a Python list (or tuple) in which the song is defined,
# the format is [['note', value]]
# Notes are 'a' through 'g' of course,
# optionally with '#' or 'b' appended for sharps or flats.
# Finally the octave number (defaults to octave 4 if not given).
# An asterisk at the end makes the note a little louder (useful for the beat).
# 'r' is a rest.
# Note value is a number:
# 1=Whole Note; 2=Half Note; 4=Quarter Note, etc.
# Dotted notes can be written in two ways:
# 1.33 = -2 = dotted half
# 2.66 = -4 = dotted quarter
# 5.33 = -8 = dotted eighth
"""
import wave, struct
import numpy as np
from math import sin, cos, pi, log, exp, floor, ceil
from mixfiles import mix_files
from demosongs import *
from mkfreq import getfreq
pitchhz, keynum = getfreq()
def linint(arr, x):
"Interpolate an (X, Y) array linearly."
for v in arr:
if v[0] == x: return v[1]
xvals = [v[0] for v in arr]
ux = max(xvals)
lx = min(xvals)
try: assert lx <= x <= ux
except:
#print lx, x, ux
raise
for v in arr:
if v[0] > x and v[0] - x <= ux - x:
ux = v[0]
uy = v[1]
if v[0] < x and x - v[0] >= lx - x:
lx = v[0]
ly = v[1]
#print lx, ly, ux, uy
return (float(x) - lx) / (ux - lx) * (uy - ly) + ly
##########################################################################
#### Main program starts below
##########################################################################
# Some parameters:
# Beats (quarters) per minute
# e.g. bpm = 95
# Octave shift (neg. integer -> lower; pos. integer -> higher)
# e.g. transpose = 0
# Pause between notes as a fraction (0. = legato and e.g., 0.5 = staccato)
# e.g. pause = 0.05
# Volume boost for asterisk notes (1. = no boost)
# e.g. boost = 1.2
# Output file name
#fn = 'pysynth_output.wav'
data = []
def make_wav(song,bpm=120,transpose=0,pause=0.,boost=1.1,repeat=0,fn="out.wav",silent=False):
f=wave.open(fn,'w')
f.setnchannels(1)
f.setsampwidth(2)
f.setframerate(44100)
f.setcomptype('NONE','Not Compressed')
bpmfac = 120./bpm
def length(l):
return 88200./l*bpmfac
def waves2(hz,l):
a=44100./hz
b=float(l)/44100.*hz
return [a,round(b)]
def asin(x):
return sin(2.*pi*x)
def render2(a, b, vol, pos, knum, note, endamp = .25, sm = 10):
b2 = (1. - pause) * b
l=waves2(a, b2)
ow=b''
q=int(l[0]*l[1])
lf = log(a)
t = (lf-3.) / (8.5-3.)
volfac = 1. + .8 * t * cos(pi/5.3*(lf-3.))
snd_len = int((10.-lf)*q)
if lf < 4: snd_len *= 2
x = np.arange(snd_len)
s = x / float(q)
ls = np.log(1. + s)
kp_len = int(l[0])
kps1 = np.zeros(snd_len)
kps2 = np.zeros(snd_len)
kps1[:kp_len] = np.random.normal(size = kp_len)
for t in range(kp_len):
kps2[t] = kps1[t:t+sm].mean()
delt = float(l[0])
li = int(floor(delt))
hi = int(ceil(delt))
ifac = delt % 1
delt2 = delt * (floor(delt) - 1) / floor(delt)
ifac2 = delt2 % 1
falloff = (4./lf*endamp)**(1./l[1])
for t in range(hi, snd_len):
v1 = ifac * kps2[t-hi] + (1.-ifac) * kps2[t-li]
v2 = ifac2 * kps2[t-hi+1] + (1.-ifac2) * kps2[t-li+1]
kps2[t] += .5 * (v1 + v2) * falloff
data[pos:pos+snd_len] += kps2*vol*volfac
ex_pos = 0.
t_len = 0
for y, x in song:
if x < 0:
t_len+=length(-2.*x/3.)
else:
t_len+=length(x)
data = np.zeros(int((repeat+1)*t_len + 20 * 44100))
#print len(data)/44100., "s allocated"
for rp in range(repeat+1):
for nn, x in enumerate(song):
if not nn % 4 and silent == False:
print("[%u/%u]\t" % (nn+1,len(song)))
if x[0]!='r':
if x[0][-1] == '*':
vol = boost
note = x[0][:-1]
else:
vol = 1.
note = x[0]
if not note[-1].isdigit():
note += '4' # default to fourth octave
a=pitchhz[note]
kn = keynum[note]
a = a * 2**transpose
if x[1] < 0:
b=length(-2.*x[1]/3.)
else:
b=length(x[1])
render2(a, b, vol, int(ex_pos), kn, note)
ex_pos = ex_pos + b
if x[0]=='r':
b=length(x[1])
ex_pos = ex_pos + b
##########################################################################
# Write to output file (in WAV format)
##########################################################################
if silent == False:
print("Writing to file", fn)
data = data / (data.max() * 2.)
out_len = int(2. * 44100. + ex_pos+.5)
data2 = np.zeros(out_len, np.short)
data2[:] = 32000. * data[:out_len]
f.writeframes(data2.tostring())
f.close()
print()
##########################################################################
# Synthesize demo songs
##########################################################################
if __name__ == '__main__':
print("*** KARPLUS-STRONG STRING ***")
print()
print("Creating Demo Songs... (this might take a few minutes)")
print()
#make_wav((('c2', 4), ('e2', 4), ('g2', 4), ('c3', 1)))
#make_wav(song1, fn = "pysynth_scale.wav")
#make_wav((('c1', 1), ('r', 1),('c2', 1), ('r', 1),('c3', 1), ('r', 1), ('c4', 1), ('r', 1),('c5', 1), ('r', 1),('c6', 1), ('r', 1),('c7', 1), ('r', 1),('c8', 1), ('r', 1), ('r', 1), ('r', 1), ('c4', 1),('r', 1), ('c4*', 1), ('r', 1), ('r', 1), ('r', 1), ('c4', 16), ('r', 1), ('c4', 8), ('r', 1),('c4', 4), ('r', 1),('c4', 1), ('r', 1),('c4', 1), ('r', 1)), fn = "all_cs.wav")
make_wav(song4_rh, bpm = 130, transpose = 1, boost = 1.15, repeat = 1, fn = "pysynth_bach_rh.wav")
make_wav(song4_lh, bpm = 130, transpose = 1, boost = 1.15, repeat = 1, fn = "pysynth_bach_lh.wav")
mix_files("pysynth_bach_rh.wav", "pysynth_bach_lh.wav", "pysynth_bach.wav")
#make_wav(song3, bpm = 132/2, pause = 0., boost = 1.1, fn = "pysynth_chopin.wav")
#make_wav(song2, bpm = 95, boost = 1.2, fn = "pysynth_anthem.wav")