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#!/usr/bin/env python
#usage:
#
# vobshift.py in.idx out.idx -8.45
#
# this will read in in.idx,shift it by 8.45 seconds back,
# and save it as out.idx
#
# license: i don't care ;)
#
import datetime
import sys
def tripletize(line):
begin = line[:11]
middle = line[11:23]
end = line[23:]
return (begin,middle,end)
def text2delta(t):
h = int( t[0:2] )
m = int( t[3:5] )
s = int( t[6:8] )
milli = int( t[9:12] )
return datetime.timedelta(hours=h,minutes=m,seconds=s,milliseconds=milli)
def delta2text(d):
t = str(d)
milli = t[8:11]
if len(milli) == 0: #fix for .000 seconds
milli = '000'
return '0'+t[:7]+':'+milli
def shift(line,seconds):
triplet = tripletize(line)
base = text2delta(triplet[1])
base = base + datetime.timedelta(seconds=seconds)
base = delta2text(base)
return triplet[0]+base+triplet[2]
INFILE =sys.argv[1]
OUTFILE =sys.argv[2]
DIFF =float(sys.argv[3])
o = open(OUTFILE,'wt')
for line in open(INFILE):
if line.startswith('timestamp'):
line = shift(line,DIFF)
o.write(line)
o.close()
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