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pysynth_samp.py
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#!/usr/bin/env python
"""
##########################################################################
# * * * PySynth * * *
# A very basic audio synthesizer in Python (www.python.org)
#
# Martin C. Doege, 2017-06-25 (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
"""
from __future__ import division
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, getfn
pitchhz, keynum = getfreq()
# get filenames for sample layer 10:
fnames = getfn(10)
# path to Salamander piano samples (http://freepats.zenvoid.org/Piano/acoustic-grand-piano.html),
# 48 kHz version:
patchpath = "/usr/share/sounds/SalamanderGrandPianoV3_48khz24bit/48khz24bit/"
##########################################################################
#### 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'
##########################################################################
def make_wav(song,bpm=120,transpose=0,leg_stac=.9,boost=1.1,repeat=0,fn="out.wav", silent=False):
f=wave.open(fn,'w')
f.setnchannels(1)
f.setsampwidth(2)
f.setframerate(48000)
f.setcomptype('NONE','Not Compressed')
bpmfac = 120./bpm
def length(l):
return 96000./l*bpmfac
def getval(v):
a = struct.unpack('i', v + b'\x00')[0] / 256 - 32768
if a > 0:
a = 1 - a / 32768
else:
a = -1 - a / 32768
return(a)
def render2(a, b, vol, pos, knum, note):
snd_len = int(b)
wf = wave.open(patchpath + fnames[knum][0], "rb")
wl = wf.getnframes()
wd = wf.readframes(wl)
new = np.zeros(wl // 6)
for x in range(wl // 6):
#left: getval( wd[6 * x:6 * x +3] )
#right: getval( wd[6 * x + 3:6 * x +6] )
new[x] = getval( wd[6 * x:6 * x +3] )
wf.close()
f = fnames[knum][1]
# Salamander samples every third piano key, so other notes
# are created by playing these samples faster (with linear interpolation):
if f > 1:
f2 = int(len(new) / f)
new2 = np.zeros(f2)
for x in range(f2):
q = x * f - int(x * f)
new2[x] = (1 - q) * new[int(x * f)] + q * new[int(x * f) + 1]
else:
new2 = new
raw_note = len(new2)
dec_ind = int(leg_stac*b)
new2[dec_ind:] *= np.exp(-np.arange(raw_note-dec_ind)/3000.)
new2[-1001:] *= np.arange(1, -.001,-.001)
if snd_len > raw_note:
print("Warning, note too long:", snd_len, raw_note)
snd_len = raw_note
data[pos:pos+snd_len] += ( new2[:snd_len] * vol )
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'
data = np.zeros(int((repeat+1)*t_len + 480000))
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. * 48000. + 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("*** SAMPLER ***")
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")