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#!/usr/bin/env python
import sys
import wave
import random
import struct
RATE = 22000
SAMPLE_LEN = RATE * 30
TSIZE = 10000 # gets doubled
class Machine():
def __init__(self, prog=None, verbose=False):
self.verbose = verbose
self.tape = map(lambda x: 0, range(TSIZE*2))
self.top = 0
self.bottom = 0
self.index = 0
self.state = 'A'
if prog:
self.prog= prog
else:
self.prog = {
'A': {}
}
def run(self):
while self.state != 'H':
self.step()
def step(self, n=1):
if self.state == 'H':
raise Exception("In halt state!")
instr = self.prog[self.state][self.tape[self.index+TSIZE]]
self.tape[self.index+TSIZE] = instr['write']
self.index += instr['dir']
if self.index > self.top:
self.top = self.index
if self.index < self.bottom:
self.bottom = self.index
self.state = instr['next']
if n>1:
self.step(n=n-1)
def __str__(self):
return "S=%s, [%d:%d]=%s" % (self.state,
self.bottom,
self.top,
''.join(map(lambda x: str(x),
self.tape[TSIZE+self.bottom:
TSIZE+self.top])))
# right is 1, left is -1
bb_2_2 = {
'A': { 0: {'next': 'B',
'write': 1,
'dir': 1},
1: {'next': 'B',
'write': 1,
'dir': -1}},
'B': { 0: {'next': 'A',
'write': 1,
'dir': -1},
1: {'next': 'H',
'write': 1,
'dir': 1}},
}
bb_6_2 = {
'A': { 0: {'next': 'B',
'write': 1,
'dir': 1},
1: {'next': 'E',
'write': 1,
'dir': -1}},
'B': { 0: {'next': 'C',
'write': 1,
'dir': 1},
1: {'next': 'F',
'write': 1,
'dir': 1}},
'C': { 0: {'next': 'D',
'write': 1,
'dir': -1},
1: {'next': 'B',
'write': 0,
'dir': 1}},
'D': { 0: {'next': 'E',
'write': 1,
'dir': 1},
1: {'next': 'C',
'write': 0,
'dir': -1}},
'E': { 0: {'next': 'A',
'write': 1,
'dir': -1},
1: {'next': 'D',
'write': 0,
'dir': 1}},
'F': { 0: {'next': 'H',
'write': 1,
'dir': -1},
1: {'next': 'C',
'write': 1,
'dir': 1}},
}
def test_fsm():
m = Machine(prog=bb_2_2)
print m
m.run()
print m
return m
def scale(val, r_bottom, r_top, amp=32767):
f = 1.0 * (val - r_bottom) / (r_top - r_bottom)
return int(amp * 2.0 * f) - amp
def go(downsample = 1, prog=bb_6_2, seconds=10, rate=22000):
noise_output = wave.open('turing_test.wav', 'w')
noise_output.setparams((1, 1, RATE, 0, 'NONE', 'not compressed'))
samples = rate * seconds
m = Machine(bb_6_2)
m.step()
for i in range(0, samples):
#value = random.randint(-32767, 32767)
if i % downsample == 0:
m.step()
value = scale(m.index, m.bottom, m.top, 32767)
packed_value = struct.pack('h', value)
noise_output.writeframes(packed_value)
#noise_output.writeframes(packed_value)
noise_output.close()
return (m.bottom, m.top)
if __name__ == '__main__':
out = ''
if len(sys.argv) > 2:
out = go(seconds=int(sys.argv[1]), downsample = int(sys.argv[2]))
elif len(sys.argv) > 1:
out = go(seconds=int(sys.argv[1]))
else:
out = go()
print out
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