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MPD

The Music Player Daemon is a music server that can be located either remotely or locally. MPD has support for MP3, Ogg, FLAC, AAC, Mod, and wav files.

Contents

About MPD

MPD is used for primarily for either of two basic functions: as a remote daemon on a network, or a local daemon. Because of its minimal need for resources both servers and desktop users use MPD. MPD does require some setting up to have it run correctly.

Install MPD

Add the basic sound formats to the USE flags:

echo "media-sound/mpd aac flac mp3 ogg vorbis" >> /etc/portage/package.use 

and install MPD

emerge -av mpd

Configuring MPD for a Local Daemon

Configurations for MPD differ depending on if you want to use MPD as a local daemon or network daemon. MPD is originally designed to run as a server and its default settings reflect that. MPD can be configured through either ~/.mpdconf per user, or globally in /etc/mpd.conf.

Setting Permissions per User

A base root setup needs to be completed first.

In /etc/mpd.conf add a valid user to be able to run the init-script.

sudo vim /etc/mpd.conf

Allow regular user access to MPD's files.

sudo chown -R user /var/lib/mpd /var/run/mpd /var/log/mpd

As regular user, create each of MPD's log files to have regular user permissions.

touch /var/log/mpd/mpd.log
touch /var/log/mpd/mpd.error.log

Copy /etc/mpd.conf to $HOME/.mpdconf.

cp /etc/mpd.conf ~/.mpdconf

Create the local configuration directories:

mkdir ~/.mpd
mkdir ~/.mpd/playlists

Now edit the preferences file $HOME/.mpdconf and specify the MPD file locations:

music_directory                 "~/Audio-Directory"
playlist_directory              "~/.mpd/playlists"
db_file                         "~/.mpd/database"
log_file                        "/var/log/mpd/mpd.log"
error_file                      "/var/log/mpd/mpd.error.log"

Also you will need:

Create the Music Database

Setup roots database (required but not used.)

sudo -u root mpd --create-db

As regular user, create a database.

mpd --create-db

(Alternately) Single-User Only

The configuration file /etc/mpd.conf can be used if you are configuring a server or are the only person on the computer who plans use MPD.

The user will need to have read and write access to the files listed in /etc/mpd.conf

Verify these exist:

MPD requires it's configuration files to belong to the audio group and to the owner listed in the configuration file

chown user:audio /var/lib/mpd
chmod gu+s /var/lib/mpd
chown user:audio /var/log/mpd/ /var/log/mpd/* /var/run/mpd/ /var/run/mpd/*

Link MPD to your Audio Directory

cd /var/lib/mpd/music
ln -s /home/user/audio-collection .

Create the Music Database

As regular user, create a database.

mpd --create-db

Configuring MPD as a Remote Daemon

A MPD server will typically create a user "mpd" and have proper settings to begin distributing sounds over a network.

Due to the client-server model, you will need to make sure connections to the port MPD listens to is possible. Edit /etc/init.d/mpd such as the depend section looks like

File: /etc/init.d/mpd
[...]
depend() {
     need alsasound localmount net.lo
     use netmount nfsmount
}
[...]
Code: Set perms
cd /var/lib/mpd
/usr/bin/mpd --create-db
chown mpd:audio -R .
chmod ug+rwX ./* -R
chmod o-rwx . -R

This will provide a /var/lib/mpd/database file readable-writable to anyone in the audio group.

Note: You might prefer to make these files read-only (permissions 750 and 640, resp.) for the audio group and let the user overwrite the database and paths in his ~/.mpdconf. As a side note, you might as well make sure your music repository belongs to the audio group as well.

Start MPD

/etc/init.d/mpd start

Add the daemon to the run-level:

rc-update add mpd default

Picking a Client

Command Line Clients

CLI options include media-sound/mpc and media-sound/ncmpc (You will want to enable local useflags for the second, like, e.g. search-screen). MPC is better used bound to keys (esp. if you own a multimedia keyboard).


Shell: Using MPC
emerge -av mpc
mpc ls music_subfolder/some_band | mpc add
mpc play

Ncmpc is a curses client for the Music Player Daemon.

Shell: Using ncmpc
emerge -av ncmpc
ncmpc -c

Also clients are listed at the

Troubleshooting MPD

The pid

For mpd-0.1.3 and prior. Setting a pid file isn't automatic. Have a pid is necessary to restart or shutdown Alsa or mpd itself. This is an over-sight of MPD as it does not create a new pid on initializing but requires one to shutdown. Also shutdown will delete any manually created pid. The only solution I've found is to add this information to the MPD boot script.

touch /var/run/mpd/mpd.pid
chown user:audio /var/run/mpd/mpd.pid


MPC connection refused

If you want to use MPC with MPD, and get following error when starting mpc:

MPD_HOST and/or MPD_PORT environment variables are not set
error: problem getting a response from "localhost" on port 6600 : Connection refused

First make sure that MPD is running (/etc/init.d/mpd status). Still not working, the solution may be adding some variables to your /etc/make.conf:

MPD_HOST="localhost"
MPD_PORT="6600"

Or, you could try commenting out the following in mpd.conf:

File: /etc/mpd.conf
bind_to_address "localhost"

Resources


Last modified: Sat, 06 Sep 2008 21:06:00 +1000 Hits: 22,588

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