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Operating OSCAR
Hierarchical File Structure and Playlists
As an introduction, we will explain the file and directory structure in comparison with a normal
CD. This will help you to understand the way OSCAR works.
A conventional audio CD-ROM has a flat directory structure. This means, there are no
subdirectories, all audio data files are arranged sequentially in the main directory and are
accessed by a track number.
OSCAR supports a hierarchical file structure with several levels of subdirectories, that allow
an arrangement of the titles according to artist, album title or other criteria. Additional, OSCAr
supports playlists, normal textfiles that are used to compose individual music programs.
The following table shows an example for a directory structure, as it is created while writing
the CD-ROM. .mp3 are the coded MPEG-files, .m3u are playlists.
root
→
John
Singer
→
My First –Album
→
→
→
→
→
Second Try
→
→
→
→
Jane Doe
→
Best Of
→
→
→
When a new CD is inserted into OSCAR, all subdirectories are scanned for .mp3 and .3u
files, all other files are ignored. A list of songs and playlists is stored in OSCARs internal
RAM with path and filename. CD-Audio tracks are scanned also, but since they do not have
a name assigned, a symbolic name and the track number is used for storage.
Playlists are stored in a list, which allows the selection of one of them with a menu function.
The directory structure of the CD-ROM is shown on the OSCAR display:
BayCom OSCAR-MP3
I sing all Day.mp3
I sing at Night.mp3
Do you sing too.mp3
John's First.m3u
Let's Start Now.mp3
I need More.mp3
The End is here.mp3
I Love You.mp3
Do You Love Me.mp3
Best of Jane.m3u
7
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