Here are the data structures with brief descriptions:

cddb_utils
cue_utils	Internal structure that bundles all variables the cue utils need
splt_addr
splt_array
splt_audacity
splt_cd
splt_cd_state
splt_error	Structure containing error strings for error messages
splt_freedb
splt_freedb_one_result	Defines one search result from the freedb search
splt_freedb_results	All the freedb search results
splt_header
splt_internal
splt_mp3
splt_mp3_state
splt_oformat
splt_ogg_state
splt_options	Structure with all the options supplied to split the file
splt_pair
splt_plugin_data	Structure containing all the data about a plugin
splt_plugin_func	Pointers to the plugin functions
splt_plugin_info	Structure containing information about one plugin
splt_plugins	Internal plugins structure
splt_point	Definition of a splitpoint
splt_progres	The data structure for the progress bar
splt_proxy	Proxy information
splt_ssplit
splt_state	Structure for the splt state
splt_struct	The data libmp3splt keeps all its internal data in
splt_syncerrors	The number of syncerrors
splt_tags	The tags of a splitpoint
splt_v_packet
splt_wrap	The wrapped filenames found inside a file
tags_parser_utils