Mercurial > boomslang
annotate tools/gen_sound.py @ 544:f79d1d3df8e8
pep8 cleanup
| author | Neil Muller <neil@dip.sun.ac.za> |
|---|---|
| date | Sat, 11 Feb 2012 12:31:33 +0200 |
| parents | 5b9f371c2bb8 |
| children | 15713dfe555d |
| rev | line source |
|---|---|
| 245 | 1 # Generate 'perfect' sine wave sounds |
| 2 | |
|
537
5b9f371c2bb8
PEP-8 cleanup of tools
Stefano Rivera <stefano@rivera.za.net>
parents:
249
diff
changeset
|
3 # Design notes: produces ~= (use requested) s raw CDDA audio - 44100 Hz |
|
5b9f371c2bb8
PEP-8 cleanup of tools
Stefano Rivera <stefano@rivera.za.net>
parents:
249
diff
changeset
|
4 # 16 bit signed values |
| 245 | 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 | |
|
537
5b9f371c2bb8
PEP-8 cleanup of tools
Stefano Rivera <stefano@rivera.za.net>
parents:
249
diff
changeset
|
13 CDDA_RATE = 44100 |
|
5b9f371c2bb8
PEP-8 cleanup of tools
Stefano Rivera <stefano@rivera.za.net>
parents:
249
diff
changeset
|
14 MAX = 105 * 256 # Max value for sine wave |
| 245 | 15 |
| 16 | |
| 249 | 17 def gen_sine(freq, secs): |
| 245 | 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') | |
| 249 | 27 for x in range(int(freq * secs)): |
| 245 | 28 output.write(''.join(data)) |
| 29 output.close() | |
| 30 | |
| 31 | |
| 32 if __name__ == "__main__": | |
| 33 freq = int(sys.argv[1]) | |
| 249 | 34 if len(sys.argv) > 2: |
| 35 secs = float(sys.argv[2]) | |
| 36 else: | |
| 37 secs = 0.25 | |
| 38 gen_sine(freq, secs) |