[MPlayer-users] child and parent in playlist

[Harry]

Hello,

i am looking for about 2 days for a solution for my problem.

maybe someone can help me?

my problem:
i use 
"MPlayer svn r34540 (Debian), built with gcc-4.6 (C) 2000-2012 MPlayer Team" 
on a Raspberry Pi and emulate a usbKeyboard with a Arduino

i controle the mplayer by these keypress from the Arduino
so i can go "backward/;forward in Playlist" with < >
i have a real big playlist with differnt bands in it
i have songs from "band_A" "band_B" "band_C".... all in one playlist like

./Band_A/Song1.mp3
./Band_A/Song2.mp3
./Band_A/Song3.mp3
./Band_B/Song1.mp3
./Band_B/Song2.mp3
./Band_B/Song3.mp3
./Band_C/Song1.mp3
./Band_C/Song2.mp3
./Band_C/Song3.mp3

and so on.

i need a key to go from Band_A to Band_B and Band_C and an other key to go 
back to Band_B or to go to an other level of the playtree.
"HOME" and "END" keys are for "got to next/:previos Playtree entry in the 
parent list" 
but how a playlist must look like for a parent and child playtree.
are there any quotas? 
is there any example file for a playtree with childs and parents in the big 
internet? i was not able to finde one :-(
has anyone used chids and parents?

i hope my description of my problem is understandable.
thanks a lot for your help and sorry if a have made any thing wrong on my 
post. 

Harry