tools/pm3_pm32wav.py

   1 #!/usr/bin/env python3
   2
   3 # Simple script to convert pm3 traces to something audible
   4 sampleRate = 16000.0 # hertz, so we're scaling the 125kHz to 16kHz
   5 default_repeat = 10
   6
   7 import sys
   8 import numpy as np
   9 import wave
  10 import struct
  11
  12 with open(sys.argv[1]) as pm3:
  13   data = np.fromfile(pm3, dtype=int, sep="\n")
  14
  15 if len(sys.argv) > 2:
  16   repeat = int(sys.argv[2], 10)
  17 else:
  18   repeat = default_repeat
  19
  20 ofile = sys.argv[1].replace('pm3', 'wav')
  21 if ofile == sys.argv[1]:
  22     ofile = sys.argv[1]+'.wav'
  23 obj = wave.open(ofile,'w')
  24 obj.setnchannels(1) # mono
  25 obj.setsampwidth(2)
  26 obj.setframerate(sampleRate)
  27 factor = (2**16)//512
  28 for i in range(repeat):
  29    for d in data:
  30        try:
  31            obj.writeframesraw( struct.pack('<h', d*factor) )
  32        except:
  33            print("B:" , d, d*factor)
  34            raise
  35 obj.close()