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comparison pyntnclick/tools/gen_sound.py @ 589:ebc48b397fd5 pyntnclick

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Turn rect_drawer into a command line option
author Neil Muller <neil@dip.sun.ac.za>
date Sat, 11 Feb 2012 17:07:52 +0200
parents tools/gen_sound.py@15713dfe555d
children
comparison
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588:0571deb177e9 589:ebc48b397fd5
1 # Generate 'perfect' sine wave sounds
2
3 # Design notes: produces ~= (use requested) s raw CDDA audio - 44100 Hz
4 # 16 bit signed values
5 # Input is freq in Hz - 440 for A, etc. - must be an integer
6 # Output is written the file beep<freq>.pcm
7 # Convert to ogg with oggenc -r <file>
8
9 import sys
10 import math
11 import struct
12
13 CDDA_RATE = 44100
14 MAX = 105 * 256 # Max value for sine wave
15
16
17 def gen_sine(freq, secs):
18 filename = 'beep%s.pcm' % freq
19 # We need to generate freq cycles and sample that CDDA_RATE times
20 samples_per_cycle = CDDA_RATE / freq
21 data = []
22 for x in range(samples_per_cycle):
23 rad = float(x) / samples_per_cycle * 2 * math.pi
24 y = MAX * math.sin(rad)
25 data.append(struct.pack('<i', y))
26 output = open(filename, 'w')
27 for x in range(int(freq * secs)):
28 output.write(''.join(data))
29 output.close()
30 return filename
31
32
33 def usage():
34 print 'Unexpected input'
35 print 'Usage: gen_sound.py <freq> [<length>]'
36 print ' where <freq> is the frequency in Hz (integer)'
37 print ' and [<length>] is the time is seconds (float)'
38
39 if __name__ == "__main__":
40 try:
41 freq = int(sys.argv[1])
42 except Exception, exc:
43 usage()
44 print 'Error was: %s' % exc
45 sys.exit(1)
46
47 if len(sys.argv) > 2:
48 try:
49 secs = float(sys.argv[2])
50 except Exception, exc:
51 usage()
52 print 'Error was: %s' % exc
53 sys.exit(1)
54 else:
55 secs = 0.25
56 output = gen_sine(freq, secs)
57 print 'Wrote sample to %s' % output