TOOLS/vobshift.py

   1 #!/usr/bin/env python
   2
   3 #usage:
   4 #
   5 # vobshift.py in.idx out.idx -8.45
   6 #
   7 # this will read in in.idx,shift it by 8.45 seconds back,
   8 # and save it as out.idx
   9 #
  10 # license: i don't care ;)
  11 #
  12
  13 import datetime
  14 import sys
  15
  16 def tripletize(line):
  17         begin = line[:11]
  18         middle = line[11:23]
  19         end = line[23:]
  20         return (begin,middle,end)
  21
  22 def text2delta(t):
  23         h = int( t[0:2] )
  24         m = int( t[3:5] )
  25         s = int( t[6:8] )
  26         milli = int( t[9:12] )
  27         return datetime.timedelta(hours=h,minutes=m,seconds=s,milliseconds=milli)
  28
  29 def delta2text(d):
  30         t = str(d)
  31         milli = t[8:11]
  32         if len(milli) == 0: #fix for .000 seconds
  33             milli = '000'
  34         return '0'+t[:7]+':'+milli
  35
  36 def shift(line,seconds):
  37         triplet = tripletize(line)
  38
  39         base = text2delta(triplet[1])
  40         base = base + datetime.timedelta(seconds=seconds)
  41         base = delta2text(base)
  42
  43         return triplet[0]+base+triplet[2]
  44
  45 INFILE  =sys.argv[1]
  46 OUTFILE =sys.argv[2]
  47 DIFF    =float(sys.argv[3])
  48
  49 o = open(OUTFILE,'wt')
  50
  51
  52 for line in open(INFILE):
  53     if line.startswith('timestamp'):
  54         line = shift(line,DIFF)
  55
  56     o.write(line)
  57
  58 o.close()