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Python: generate audio noise
# from http://soledadpenades.com/2009/10/29/fastest-way-to-generate-wav-files-in-python-using-the-wave-module/
import wave
import random
import struct
import datetime
SAMPLE_LEN = 44100 * 300 # 300 seconds of noise, 5 minutes
print "Create file using wave and writeframes twice in each iteration"
noise_output = wave.open('noise.wav', 'w')
noise_output.setparams((2, 2, 44100, 0, 'NONE', 'not compressed'))
d1 = datetime.datetime.now()
for i in range(0, SAMPLE_LEN):
value = random.randint(-32767, 32767)
packed_value = struct.pack('h', value)
noise_output.writeframes(packed_value)
noise_output.writeframes(packed_value)
d2 = datetime.datetime.now()
print (d2 - d1), "(time for writing frames)"
noise_output.close()
d3 = datetime.datetime.now()
print (d3 - d2), "(time for closing the file)"
# --------------
print "Create a file directly writing to the file twice in each iteration"
noise_file = open('noise.raw', 'w')
d1 = datetime.datetime.now()
for i in range(0, SAMPLE_LEN):
value = random.randint(-32767, 32767)
packed_value = struct.pack('h', value)
noise_file.write(packed_value)
noise_file.write(packed_value)
d2 = datetime.datetime.now()
print (d2 - d1), "(time for writing frames)"
noise_file.close()
d3 = datetime.datetime.now()
print (d3 - d2), "(time for closing the file)"
# --------------
print "Create file using wave, storing frames in an array and using writeframes only once"
noise_output = wave.open('noise2.wav', 'w')
noise_output.setparams((2, 2, 44100, 0, 'NONE', 'not compressed'))
d1 = datetime.datetime.now()
values = []
for i in range(0, SAMPLE_LEN):
value = random.randint(-32767, 32767)
packed_value = struct.pack('h', value)
values.append(packed_value)
values.append(packed_value)
value_str = ''.join(values)
noise_output.writeframes(value_str)
d2 = datetime.datetime.now()
print (d2 - d1), "(time for writing frames)"
noise_output.close()
d3 = datetime.datetime.now()
print (d3 - d2), "(time for closing the file)"
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