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