Demo/sgi/video/Vfix.py

   1 #!/ufs/guido/bin/sgi/python
   2
   3 # Copy a video file, fixing the line width to be a multiple of 4
   4
   5
   6 # Usage:
   7 #
   8 # Vfix [infile [outfile]]
   9
  10
  11 # Options:
  12 #
  13 # infile     : input file (default film.video)
  14 # outfile    : output file (default out.video)
  15
  16
  17 import sys
  18 import imageop
  19 sys.path.append('/ufs/guido/src/video')
  20 import VFile
  21
  22
  23 # Main program -- mostly command line parsing
  24
  25 def main():
  26         args = sys.argv[1:]
  27         if len(args) < 1:
  28                 args.append('film.video')
  29         if len(args) < 2:
  30                 args.append('out.video')
  31         if len(args) > 2:
  32                 sys.stderr.write('usage: Vfix [infile [outfile]]\n')
  33                 sys.exit(2)
  34         sts = process(args[0], args[1])
  35         sys.exit(sts)
  36
  37
  38 # Copy one file to another
  39
  40 def process(infilename, outfilename):
  41         try:
  42                 vin = VFile.BasicVinFile(infilename)
  43         except IOError, msg:
  44                 sys.stderr.write(infilename + ': I/O error: ' + `msg` + '\n')
  45                 return 1
  46         except VFile.Error, msg:
  47                 sys.stderr.write(msg + '\n')
  48                 return 1
  49         except EOFError:
  50                 sys.stderr.write(infilename + ': EOF in video file\n')
  51                 return 1
  52
  53         try:
  54                 vout = VFile.BasicVoutFile(outfilename)
  55         except IOError, msg:
  56                 sys.stderr.write(outfilename + ': I/O error: ' + `msg` + '\n')
  57                 return 1
  58
  59         info = vin.getinfo()
  60         if info[0] <> 'grey':
  61                 sys.stderr.write('Vfix: input not in grey format\n')
  62                 return 1
  63         vout.setinfo(info)
  64         inwidth, height = vin.getsize()
  65         pf = vin.packfactor
  66         if (inwidth/pf)%4 == 0:
  67                 sys.stderr.write('Vfix: fix not necessary\n')
  68                 return 1
  69         outwidth = (inwidth/pf/4)*4*pf
  70         print 'inwidth =', inwidth, 'outwidth =', outwidth
  71         vout.setsize(outwidth, height)
  72         vout.writeheader()
  73         n = 0
  74         try:
  75                 while 1:
  76                         t, data, cdata = vin.getnextframe()
  77                         n = n + 1
  78                         sys.stderr.write('Frame ' + `n` + '...')
  79                         data = imageop.crop(data, 1, inwidth/pf, height/pf, \
  80                                 0, 0, outwidth/pf-1, height/pf-1)
  81                         vout.writeframe(t, data, None)
  82                         sys.stderr.write('\n')
  83         except EOFError:
  84                 pass
  85         return 0
  86
  87
  88 # Don't forget to call the main program
  89
  90 main()