py-ogg2/examples/reserializer.py

   1 '''
   2   function: Ogg ReSerializer
   3   last mod: $Id: reserializer.py
   4
   5 This is a useful tool for changing the serial number of an Ogg stream.
   6 Why is it useful?  Because you can't chain two logical streams together
   7 in the same physical stream which have the same serial numbers.
   8
   9 '''
  10
  11 import ogg2
  12 import random
  13
  14 infilename = raw_input('Input File: ')
  15 outfilename = raw_input('Output File: ')
  16
  17 inf=open(infilename, 'r')
  18 otf=open(outfilename, 'w')
  19
  20 syncin=ogg2.OggSyncState()
  21 syncout=ogg2.OggSyncState()
  22
  23 serials = {}
  24
  25 while 1: # While there's data to input
  26   if syncin.input(inf) == 0 : break
  27   while 1: # While there are pages to output
  28     page = syncin.pageout()
  29     if page==None : break
  30     if page.bos :
  31       serials[page.serialno] = int(random.random()*2147483647)
  32       print 'ReSerializing stream %d to %d' % (page.serialno,
  33                                                serials[page.serialno])
  34     if serials.has_key(page.serialno) :
  35       page.serialno = serials[page.serialno]
  36       syncout.pagein(page)
  37       while 1:
  38         if syncout.output(otf) == 0 : break
  39     else :
  40       print 'Headless stream %d found, skipping' % page.serialno
  41
  42 print "Done."