-
Notifications
You must be signed in to change notification settings - Fork 21
/
Copy pathpysynth_b.py
executable file
·267 lines (227 loc) · 8.22 KB
/
pysynth_b.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
#!/usr/bin/env python
#print "*** EXPERIMENTAL PIANO VERSION WITH NOTE CACHING ***"
"""
##########################################################################
# * * * PySynth * * *
# A very basic audio synthesizer in Python (www.python.org)
#
# Martin C. Doege, 2009-06-08 ([email protected])
##########################################################################
# 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
from mixfiles import mix_files
from demosongs import *
from mkfreq import getfreq
pitchhz, keynum = getfreq()
# Harmonic intensities (dB) for selected piano keys,
# measured with output from a Yamaha P-85
harmo = (
(1, -15.8, -3., -15.3, -22.8, -40.7),
(16, -15.8, -3., -15.3, -22.8, -40.7),
(28, -5.7, -4.4, -17.7, -16., -38.7),
(40, -6.8, -17.2, -22.4, -16.8, -75.6),
(52, -8.4, -19.7, -23.5, -21.6, -76.8),
(64, -9.3, -20.8, -37.2, -36.3, -76.4),
(76, -18., -64.5, -74.4, -77.3, -80.8),
(88, -24.8, -53.8, -77.2, -80.8, -90.),
)
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
harmtab = np.zeros((88, 20))
for h in range(1, len(harmo[0])):
dat = []
for n in range(len(harmo)):
dat.append((float(harmo[n][0]), harmo[n][h]))
for h2 in range(88):
harmtab[h2,h] = linint(dat, h2+1)
#print harmtab[keynum['c4'],:]
for h2 in range(88):
for n in range(20):
ref = harmtab[h2,1]
harmtab[h2,n] = 10.**((harmtab[h2,n] - ref)/20.)
#print harmtab[keynum['c4'],:]
##########################################################################
#### 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
# Playing style (e.g., 0.8 = very legato and e.g., 0.3 = very staccato)
# e.g. leg_stac = 0.6
# Volume boost for asterisk notes (1. = no boost)
# e.g. boost = 1.2
# Output file name
#fn = 'pysynth_output.wav'
# Other parameters:
# Influences the decay of harmonics over frequency. Lowering the
# value eliminates even more harmonics at high frequencies.
# Suggested range: between 3. and 5., depending on the frequency response
# of speakers/headphones used
harm_max = 5.
##########################################################################
def make_wav(song,bpm=120,transpose=0,leg_stac=.9,boost=1.1,repeat=0,fn="out.wav", silent=False):
data = []
note_cache = {}
cache_this = {}
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)]
att_len = 3000
att_bass = np.zeros(att_len)
att_treb = np.zeros(att_len)
for n in range(att_len):
att_treb[n] = linint(((0,0.), (100, .2), (300, .7), (400, .6), (600, .25), (800, .9), (1000, 1.25), (2000,1.15), (3000, 1.)), n)
att_bass[n] = linint(((0,0.), (100, .1), (300, .2), (400, .15), (600, .1), (800, .9), (1000, 1.25), (2000,1.15), (3000, 1.)), n)
decay = np.zeros(1000)
for n in range(900):
decay[n] = exp(linint(( (0,log(3)), (3,log(5)), (5, log(1.)), (6, log(.8)), (9,log(.1)) ), n/100.))
def render2(a, b, vol, pos, knum, note):
l=waves2(a, 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.))
schweb = waves2(lf*100., b)[0]
schweb_amp = .05 - (lf-5.) / 100.
att_fac = min(knum / 87. * vol, 1.)
snd_len = max(int(3.1*q), 44100)
fac = np.ones(snd_len)
fac[:att_len] = att_fac * att_treb + (1.-att_fac) * att_bass
raw_note = 12*44100
if note not in list(note_cache.keys()):
x2 = np.arange(raw_note)
sina = 2. * pi * x2 / float(l[0])
ov = np.exp(-x2/3./decay[int(lf*100)]/44100.)
new = (( np.sin(sina)
+ ov*harmtab[kn,2]*np.sin(2. * sina)
+ ov*harmtab[kn,3]*np.sin(3. * sina)
+ ov*harmtab[kn,4]*np.sin(4. * sina)
+ ov*harmtab[kn,5]*np.sin(8. * sina)
) * volfac )
new *= np.exp(-x2/decay[int(lf*100)]/44100.)
if cache_this[note] > 1:
note_cache[note] = new.copy()
#print "Caching", note
else:
new = note_cache[note].copy()
dec_ind = int(leg_stac*q)
new[dec_ind:] *= np.exp(-np.arange(raw_note-dec_ind)/3000.)
if snd_len > raw_note:
print("Warning, note too long:", snd_len, raw_note)
snd_len = raw_note
data[pos:pos+snd_len] += ( new[:snd_len] * fac * vol *
(1. + schweb_amp * np.sin(2. * pi * np.arange(snd_len)/schweb/32.) ) )
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)
if y[-1] == '*':
y = y[:-1]
if not y[-1].isdigit():
y += '4'
cache_this[y] = cache_this.get(y, 0) + 1
#print "Note frequencies in song:", cache_this
data = np.zeros(int((repeat+1)*t_len + 441000))
#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("*** EXPERIMENTAL PIANO VERSION WITH NOTE CACHING ***")
print()
print("Creating Demo Songs... (this might take about a minute)")
print()
#make_wav((('c', 4), ('e', 4), ('g', 4), ('c5', 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, leg_stac = 0.9, boost = 1.1, fn = "pysynth_chopin.wav")