Here are the data structures with brief descriptions:

CKit_Codec	Contains information about the used codec for playback
CKit_OutputFormat	Contains information about the data format coming out from the player
CKit_Player	Player state container
CKit_PlayerInfo	Contains information about the streams selected for playback
CKit_PlayerStreamInfo	Contains data about a stream selected for playback
CKit_Source	Audio/video source
CKit_SourceStreamInfo	Information for a source stream
CKit_Version	SDL_kitchensink library version container