file/magdir/animation

   1
   2 #------------------------------------------------------------------------------
   3 # animation:  file(1) magic for animation/movie formats
   4 #
   5 # animation formats
   6 # MPEG, FLI, DL originally from vax@ccwf.cc.utexas.edu (VaX#n8)
   7 # FLC, SGI, Apple originally from Daniel Quinlan (quinlan@yggdrasil.com)
   8
   9 # MPEG animation format
  10 0       string          \000\000\001\263        MPEG file
  11
  12 # FLI animation format
  13 4       leshort         0xAF11                  FLI file
  14 >6      leshort         x                       - %d frames,
  15 >8      leshort         x                       width=%d pixels,
  16 >10     leshort         x                       height=%d pixels,
  17 >12     leshort         x                       depth=%d,
  18 >16     leshort         x                       ticks/frame=%d
  19 # FLC animation format
  20 4       leshort         0xAF12                  FLC file
  21 >6      leshort         x                       - %d frames
  22 >8      leshort         x                       width=%d pixels,
  23 >10     leshort         x                       height=%d pixels,
  24 >12     leshort         x                       depth=%d,
  25 >16     leshort         x                       ticks/frame=%d
  26
  27 # DL animation format
  28 # XXX - collision with most `mips' magic
  29 #
  30 # I couldn't find a real magic number for these, however, this
  31 # -appears- to work.  Note that it might catch other files, too, so be
  32 # careful!
  33 #
  34 # Note that title and author appear in the two 20-byte chunks
  35 # at decimal offsets 2 and 22, respectively, but they are XOR'ed with
  36 # 255 (hex FF)!  The DL format is really bad.
  37 #
  38 #0      byte    1       DL version 1, medium format (160x100, 4 images/screen)
  39 #>42    byte    x       - %d screens,
  40 #>43    byte    x       %d commands
  41 #0      byte    2       DL version 2
  42 #>1     byte    1       - large format (320x200,1 image/screen),
  43 #>1     byte    2       - medium format (160x100,4 images/screen),
  44 #>1     byte    >2      - unknown format,
  45 #>42    byte    x       %d screens,
  46 #>43    byte    x       %d commands
  47 # Based on empirical evidence, DL version 3 have several nulls following the
  48 # \003.  Most of them start with non-null values at hex offset 0x34 or so.
  49 #0      string  \3\0\0\0\0\0\0\0\0\0\0\0        DL version 3
  50
  51 # SGI and Apple formats
  52 0       string          MOVI            Silicon Graphics movie file
  53 4       string          moov            Apple QuickTime movie file (moov)
  54 4       string          mdat            Apple QuickTime movie file (mdat)