Here is a list of all documented files with brief descriptions:

actf.h	The main API entrypoint for actf, only this file should be included
config.h	Actf configuration
decoder.h	A CTF2 decoder and its methods
event.h	Event related methods
event_generator.h	Event generator API
filter.h	A time-based event filter and its methods
flags.h	Bit map flags related methods
fld.h	Field related methods
fld_cls.h	Field class related methods
fld_loc.h	Field location related methods
freader.h	A file-based CTF2 reader and its methods
lua_filter.h	A lua event filter and its methods
mappings.h	Mapping related methods
metadata.h	A CTF2 metadata representation
muxer.h	A muxer and its methods
pkt.h	Packet related methods
print.h	Event and field printer utility
rng.h	Range set related methods
types.h	Basic types used by ACTF