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This is information on what the various files in libdvdnav/src are for:

public API
----------

dvdnav.h                main public header
dvdnav_events.h         events returned by get_next_block()
dvd_types.h             some additional convenience types, mostly unused yet

dvd_reader.h            libdvdread API
ifo_types.h             IFO structures translated into C
ifo_read.h              reading and parsing of IFO structures
nav_types.h             NAV structures translated into C
nav_read.h              reading and parsing of NAV structures
nav_print.h             print NAV structures in a human readable form

client interaction
------------------

dvdnav.c                the big get_next_block() function and some basic housekeeping
dvdnav_internal.h       internal structure of libdvdnav library handle
navigation.c            basic Title/Part navigation
searching.c             PGC/PG navigation and seeking, position reporting
highlight.c             DVD menu highlight handling
settings.c              libdvdnav customizing
remap.[ch]              user defined reorganization of VOBU playback order

DVD virtual machine (subdirectory vm)
-------------------

vm.[ch]                 the logic surrounding the DVD VM
decoder.[ch]            decodes and executes DVD VM commands

DVD reading (subdirectory dvdread, a modified copy of libdvdread)
-----------

dvd_reader.c            reading data from DVD sources
dvd_udf.[ch]            handles the UDF filesystem
dvd_input.[ch]          lowlevel input abstraction, libdvdcss glue code
md5.[ch]                md5 hashing to provide unique disc IDs

ifo_read.c              reading and parsing of IFO structures
nav_read.c              reading and parsing of NAV structures
nav_print.c             output NAV structures in a human readable form

read_cache.[ch]         caching

debugging and utilities
-----------------------

bswap.h                 endianness helper macros
dvdread_internal.h      CHECK_VALUE() helper macro
vmcmd.[ch]              print DVD VM commands and registers in a human readable form

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