#!/usr/bin/env python3

# Simple script to convert pm3 traces to something audible
sampleRate = 16000.0 # hertz, so we're scaling the 125kHz to 16kHz
default_repeat = 10

import sys
import numpy as np
import wave
import struct

with open(sys.argv[1]) as pm3:
  data = np.fromfile(pm3, dtype=int, sep="\n")

if len(sys.argv) > 2:
  repeat = int(sys.argv[2], 10)
else:
  repeat = default_repeat

ofile = sys.argv[1].replace('pm3', 'wav')
if ofile == sys.argv[1]:
    ofile = sys.argv[1]+'.wav'
obj = wave.open(ofile,'w')
obj.setnchannels(1) # mono
obj.setsampwidth(2)
obj.setframerate(sampleRate)
factor = (2**16)//512
for i in range(repeat):
   for d in data:
       try:
           obj.writeframesraw( struct.pack('<h', d*factor) )
       except:
           print("B:" , d, d*factor)
           raise
obj.close()