Certain AIFF files encode XA ADPCM compressed audio using a chunk with the tag `APCM`. Aside from this custom chunk type, they're otherwise standard AIFF files. I've only observed these files in the Sega Saturn game Sonic Jam so far.
fde057dfb2 aiff: add support for XA ADPCM
libavformat/aiffdec.c | 7 +++++++
1 file changed, 7 insertions(+)