[FFmpeg-devel] [PATCH v2 0/3] avcodec/sanm: Fixes for "StarWars - Making Magic"

[Manuel Lauss]

This patchset extends the SANM codec handler to support video of
the 1996 CD-ROM Title "StarWars - Making Magic".
These videos all consist of a 640x480 codec3 background, with 320x240
codec48 animations put on top at random left/top offsets.

v2: reworded descriptions, fixes in #3.

#1: some "Making Magic" files advertise codec48 compression type 6.
    The actual data stops after the codec headers, and the dos exe as well as
    the codec48 decoder in the MotS game exe don't know of it and simply
    ignore it.

#2: change the FOBJ frame size determination to recognize common sizes.
    With the scheme employed by Making Magic, the codec48 dimensions can no
    longer be blindly trusted.

#3: support video of Making Magic.  This patch also brings the fobj
    handling more in line with what the game engines actually do.

Tested with RA1, RA2 (c37), Outlaws (c47), MotS (c48)

See https://ibb.co/73Pt803  for post/pre fix screenshots.

Manuel Lauss (3):
  avcodec/sanm: ignore codec48 compression type 6
  avcodec/sanm: add a whitelist for known FOBJ sizes
  avcodec/sanm: support "StarWars - Making Magic" video

 libavcodec/sanm.c | 100 ++++++++++++++++++++++++++++++++--------------
 1 file changed, 70 insertions(+), 30 deletions(-)

-- 
2.49.0