File: noice.py
   1 #!/usr/bin/python3
   2 
   3 # The MIT License (MIT)
   4 #
   5 # Copyright © 2024 pacman64
   6 #
   7 # Permission is hereby granted, free of charge, to any person obtaining a copy
   8 # of this software and associated documentation files (the “Software”), to deal
   9 # in the Software without restriction, including without limitation the rights
  10 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11 # copies of the Software, and to permit persons to whom the Software is
  12 # furnished to do so, subject to the following conditions:
  13 #
  14 # The above copyright notice and this permission notice shall be included in
  15 # all copies or substantial portions of the Software.
  16 #
  17 # THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  20 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23 # SOFTWARE.
  24 
  25 
  26 # noice [options...] [duration...]
  27 #
  28 # Make white-noise as 48khz stereo wave-format sound data.
  29 #
  30 # The duration is an optional floating-point number of seconds: if not given,
  31 # the default duration is 1 second.
  32 
  33 
  34 from math import isinf, isnan
  35 from random import normalvariate
  36 from struct import pack
  37 from sys import argv, exit, stderr, stdout
  38 from wave import open as open_wav, Wave_write
  39 
  40 
  41 # info is the help message shown when asked to
  42 info = '''
  43 noice [options...] [duration...]
  44 
  45 Make white-noise as 48khz stereo wave-format sound data.
  46 
  47 The duration is an optional floating-point number of seconds: if not given,
  48 the default duration is 1 second.
  49 '''.strip()
  50 
  51 # handle standard help cmd-line options, quitting right away in that case
  52 if len(argv) == 2 and argv[1] in ('-h', '--h', '-help', '--help'):
  53     print(info, file=stderr)
  54     exit(0)
  55 
  56 
  57 def run(w: Wave_write, channels, samples: int) -> None:
  58     for i in range(samples):
  59         for j in range(channels):
  60             f = min(max(normalvariate(0.0, 0.5), -1.0), +1.0)
  61             d = pack('<h', int(32_767 * f))
  62             w.writeframesraw(d)
  63 
  64 
  65 duration = 1.0
  66 # handle leading options
  67 if len(argv) == 2:
  68     try:
  69         duration = float(argv[1])
  70         if duration < 0 or isnan(duration) or isinf(duration):
  71             duration = 0.0
  72     except Exception as e:
  73         print(f'\x1b[31m{e}\x1b[0m', file=stderr)
  74         exit(1)
  75 
  76 try:
  77     rate = 48_000
  78     channels = 2
  79     samples = int(duration * rate)
  80     params = (channels, 2, rate, samples, 'NONE', 'none')
  81     with open_wav(stdout.buffer, 'wb') as w:
  82         w.setparams(params)
  83         run(w, channels, samples)
  84     stdout.buffer.flush()
  85 except (BrokenPipeError, KeyboardInterrupt):
  86     # quit quietly, instead of showing a confusing error message
  87     stderr.flush()
  88     stderr.close()
  89 except Exception as e:
  90     print(f'\x1b[31m{e}\x1b[0m', file=stderr)
  91     exit(1)