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comparison tools/gen_sound.py @ 249:913257638e6f

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Add length parameter
author Neil Muller <neil@dip.sun.ac.za>
date Fri, 27 Aug 2010 15:51:50 +0200
parents f87a3485d927
children 5b9f371c2bb8
comparison
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248:37f892b59c4b 249:913257638e6f
1 # Generate 'perfect' sine wave sounds 1 # Generate 'perfect' sine wave sounds
2 2
3 # Design notes: produces ~= 0.5s raw CDDA audio - 44100 Hz, 16 bit signed values 3 # Design notes: produces ~= (use requested) s raw CDDA audio - 44100 Hz, 16 bit signed values
4 # Input is freq in Hz - 440 for A, etc. - must be an integer 4 # Input is freq in Hz - 440 for A, etc. - must be an integer
5 # Output is written the file beep<freq>.pcm 5 # Output is written the file beep<freq>.pcm
6 # Convert to ogg with oggenc -r <file> 6 # Convert to ogg with oggenc -r <file>
7 7
8 import sys 8 import sys
11 11
12 12
13 CDDA_RATE = 44100 13 CDDA_RATE = 44100
14 MAX = 105*256 # Max value for sine wave 14 MAX = 105*256 # Max value for sine wave
15 15
16 def gen_sine(freq): 16 def gen_sine(freq, secs):
17 filename = 'beep%s.pcm' % freq 17 filename = 'beep%s.pcm' % freq
18 # We need to generate freq cycles and sample that CDDA_RATE times 18 # We need to generate freq cycles and sample that CDDA_RATE times
19 samples_per_cycle = CDDA_RATE / freq 19 samples_per_cycle = CDDA_RATE / freq
20 data = [] 20 data = []
21 for x in range(samples_per_cycle): 21 for x in range(samples_per_cycle):
22 rad = float(x) / samples_per_cycle * 2 * math.pi 22 rad = float(x) / samples_per_cycle * 2 * math.pi
23 y = MAX * math.sin(rad) 23 y = MAX * math.sin(rad)
24 data.append(struct.pack('<i', y)) 24 data.append(struct.pack('<i', y))
25 output = open(filename, 'w') 25 output = open(filename, 'w')
26 for x in range(freq/2): 26 for x in range(int(freq * secs)):
27 output.write(''.join(data)) 27 output.write(''.join(data))
28 output.close() 28 output.close()
29 29
30 30
31 if __name__ == "__main__": 31 if __name__ == "__main__":
32 freq = int(sys.argv[1]) 32 freq = int(sys.argv[1])
33 gen_sine(freq) 33 if len(sys.argv) > 2:
34 secs = float(sys.argv[2])
35 else:
36 secs = 0.25
37 gen_sine(freq, secs)