The Digital Audio Jukebox server software is written in Perl, and runs under Linux. It uses MPG321 (or the original, MPG123) as the MP3 playback engine, and playlists and MP3 file information is stored in a MySQL database. I use MPG321 because MPG123 seems to have a problem with VBR MP3s - audio output is fine, but the status messages (time elapsed etc) jump around all over the place.

You need to install the following packages on your server:

Perl + modules: Audio::Mixer, MPEG::MP3Info, DBI/DBD mysql
MySQL
mpg321

In Debian (why use anything else?) you can type the following to install the packages (apt will find all the dependencies and get them automatically):
apt-get install mysql-server mysql-client mpg321 libc6-dev gcc make ncftp nfs-common aumix

You may already have some of these packages, but I like to start from a completely basic Debian Woody install (skip dselect and tasksel) and install only the packages I need. That command will get everything you need to run the Jukebox:
ncftp - For retreiving the Perl modules from CPAN
libc6-dev - Header files required by Audio::Mixer
make & gcc - For compiling the Perl modules
nfs-common - If you want to mount remote NFS partitions
aumix - Tool for setting mixer volumes, useful for testing but not required

To install the Perl modules from CPAN type:
perl -MCPAN -e 'install Audio::Mixer, MPEG::MP3Info"
If you get asked if you are ready for manual configuration, just say no and it will work everything out automatically. You'll be prompted about unsatisfied dependancies, just answer 'yes' to all of them.

Then you need to download the Digital Audio Jukebox software. The following files are included in the distribution:

Ok, now you want to make sure you can make your soundcards work in Linux. If you use the Soundblaster Live 5.1 card you can load the emu10k1 module which is included with the 2.4 kernel, or you can get the driver from Creative Labs.

Depending on the numbers of cards in your system you may have to create some more dsp and mixer devices - you need 2 dsps and 1 mixer for each SB 5.1 card. I have 3 SB 5.1 cards in my system, but only had /dev/dsp, dsp1, dsp2 and dsp3, although I had /dev/mixer thru mixer3. You must use the mknod command to create the extra devices, then set the permissions, e.g

mknod /dev/dsp4 c 14 67
mknod /dev/dsp5 c 14 83
chgrp audio /dev/dsp4 /dev/dsp5
chmod ug=rw,o-r /dev/dsp4 /dev/dsp5

You then need to split the front/rear outputs on the SB 5.1 to separate dsp devices, and create a mixer volume control for each. To do this you can use the emu-dspmgr program, which is part of the emu-tools package from Creative Labs. I have provided a script called make_emu_routes.sh that uses the emu-dspmgr and emu-config tools to split the front and rear outputs onto separate dsp devices, for 3 SB 5.1 cards:

# Configures front/rear outputs on a Soudblaster Live! 5.1 to use separate dsp devices

DSPMGR="/usr/local/bin/emu-dspmgr"
EMUCONFIG="/usr/local/bin/emu-config"

#First card
MIXER="/dev/mixer"
$EMUCONFIG -M $MIXER -d #Use SPDIF digital output
$EMUCONFIG -M $MIXER -B on #Turn on the 12db boost on front analogue output (headphones)
DSP="/dev/dsp"
$DSPMGR -D $DSP -M $MIXER -v"Pcm L:Front L" -mpcm_l
$DSPMGR -D $DSP -M $MIXER -v"Pcm R:Front R" -mpcm_r
DSP="/dev/dsp1"
$DSPMGR -D $DSP -M $MIXER -v"Pcm1 L:Rear L" -mpcm2_l
$DSPMGR -D $DSP -M $MIXER -v"Pcm1 R:Rear R" -mpcm2_r

#Second card
MIXER="/dev/mixer1"
$EMUCONFIG -M $MIXER -a #Use analogue output
$EMUCONFIG -M $MIXER -B off #Turn off the 12db boost on front analogue output
DSP="/dev/dsp2"
$DSPMGR -D $DSP -M $MIXER -v"Pcm L:Front L" -mpcm_l
$DSPMGR -D $DSP -M $MIXER -v"Pcm R:Front R" -mpcm_r
DSP="/dev/dsp3"
$DSPMGR -D $DSP -M $MIXER -v"Pcm1 L:Rear L" -mpcm2_l
$DSPMGR -D $DSP -M $MIXER -v"Pcm1 R:Rear R" -mpcm2_r

#Third card
MIXER="/dev/mixer2"
$EMUCONFIG -M $MIXER -a #Use analogue output
$EMUCONFIG -M $MIXER -B off #Turn off the 12db boost on front analogue output
DSP="/dev/dsp4"
$DSPMGR -D $DSP -M $MIXER -v"Pcm L:Front L" -mpcm_l
$DSPMGR -D $DSP -M $MIXER -v"Pcm R:Front R" -mpcm_r
DSP="/dev/dsp5"
$DSPMGR -D $DSP -M $MIXER -v"Pcm1 L:Rear L" -mpcm2_l
$DSPMGR -D $DSP -M $MIXER -v"Pcm1 R:Rear R" -mpcm2_r

You can modify this to suit the number of SB Live cards in your machine, and choose either analogue/digital output, and enable/disable the headphone boost for each card. In each mixer it creates the volume controls pcm and pcm2, which are the 2 dsp devices, front and rear. You can test you have these new controls by running aumix for each mixer device, for example:
aumix -d /dev/mixer1 -I

Then you can try using mpg321 to play an mp3 to any of the /dev/dsp devices you have:
mpg321 /path/to/my/songs/song.mp3 -d /dev/dsp3

If that all works, then it's on to the next step.....

MySQL config. You can run the following command to create a user and the necessary tables (Of course if you have set a password for mysql you must specify it on the command line):
mysql < create_mysql_tables.sql

Then populate the database with your song information using dbsync.pl:
dbsync.pl /path/to/my/mp3s

Now edit zones.conf to set the mixers and dsp devices for each zone, and the description that will be displayed in the client. The <index> field must be a sequential number, or wierd things will happen. My zones.conf looks like this:

<index>:<Description>:<mixer>:<mixer channel>:<output device>
0:Headphones:/dev/mixer:pcm:/dev/dsp0
1:Living Room:/dev/mixer:pcm2:/dev/dsp1
2:Bathroom:/dev/mixer1:pcm:/dev/dsp2
3:Bedroom:/dev/mixer1:pcm2:/dev/dsp3
4:Dining Room:/dev/mixer2:pcm:/dev/dsp4
5:Kitchen:/dev/mixer2:pcm2:/dev/dsp5

Fire up server.pl, and you're ready to connect using one of the clients.