Mathias Dietz Weblog

Some people ask me , how they can change the playlist file to work with the SDCard.
So , I decided to write a short Howto:

First you need a hex editor.
For example HexEdit (Windows). Or KhexEdit (Linux)

Then, you have to understand the playlist/spl format , here is a short description:

Header
01	00	00	00	00	00			Init Sequence
00	00	00	00					Nr of Entries
For each Entry:
02	00							Init entry
00	00	00	00					Entry number /position
00	00	00	00	00	00	00	00	Filesize
00	00	00	00					Playtime
00	00	00	00					Size of title
?	?	?	?	?	?	?	?	Title
00	00	00	00					Size of artist
?	?	?	?	?	?	?	?	Artist
00	00	00	00					Size of album
?	?	?	?	?	?	?	?	Album
00	00	00	00					Size of genre
?	?	?	?	?	?	?	?	Genre
00	00	00	00					Size of absolute file path
?	?	?	?	?	?	?	?	Absolute file path
00								Track nr
00								Closing byte

The important part is the "absolut file path". This is the path where the aireo can find the mp3 file.
Normally it would be something like \Disk\MyMusic\artist\album\title.mp3.
Changing the "absolute file path" to \Storage Card\... causes the aireo to search on the SDCard.
But you have to pay attention to the previous 4 bytes ("size of absolute file path") ! These bytes define the length of the "absolute file path".
So you have the following options:
1. Change \Disk\ to \Storage Card\ and change the mp3 file name so that the whole path has the same length as before.(don't forget to rename the mp3 file.)
2. Change \Disk\ to \Storage Card\ and add 8 to the "size of absolute file path". (e.g. 3F 00 00 00 -> 47 00 00 00)

That's it ! The playlist contains now a song located on the SDCard !!