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Alpine MPD Lite

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Didn’t get my hand dirty for a long time.


Music Player Daemon (MPD) is a flexible, powerful, server-side application for playing music. Through plugins and libraries it can play a variety of sound files while being controlled by its network protocol. - www.musicpd.org

Above is a short description from MPD developer site. Indeed too short. MPD is powerful and feature rich. On one hand it has too many features I don’t need. I just want a music player that can be control remotely. On the other hand the mpd package from Alpine repository some how has a high cpu usage and I have no clue how to debug it. Eventually I decided to just roll my own version and cut everything to the bare minimum.

Download MPD Source

Get latest source from musicpd.org.

Install Build Tools

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apk add build-base boost ninja boost-dev meson

Install Build Dependencies

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apk add alsa-lib-dev sqlite-dev ffmpeg-dev
LibraryUsage
alsa-lib-devLinux ALSA sound system. This is for sound output.
ffmpeg-devThis take care of 99% of audio file playback.
sqlite-devFor mpd song database.

Compile

Following MPD instructions and some modification from Alpine community APKBUILD

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meson . output/release \
  --prefix=/usr \
  --sysconfdir=/etc \
  --mandir=/usr/share/man \
  --localstatedir=/var \
  --buildtype=release \
  -Dcue=true \
  -Ddaemon=true \
  -Ddatabase=true \
  -Depoll=true \
  -Deventfd=true \
  -Dfifo=true \
  -Dinotify=true \
  -Dlocal_socket=true \
  -Dpipe=true \
  -Dsignalfd=true \
  -Dtcp=true \
  -Dalsa=enabled \
  -Dffmpeg=enabled \
  -Dipv6=enabled \
  -Dsqlite=enabled \
  -Dsyslog=enabled \
  -Ddocumentation=false \
  -Ddsd=false \
  -Dhttpd=false \
  -Dneighbor=false \
  -Drecorder=false \
  -Dtest=false \
  -Dwave_encoder=false \
  -Dadplug=disabled \
  -Dao=disabled \
  -Daudiofile=disabled \
  -Dbzip2=disabled \
  -Dcdio_paranoia=disabled \
  -Dchromaprint=disabled \
  -Dcurl=disabled \
  -Ddbus=disabled \
  -Dexpat=disabled \
  -Dfaad=disabled \
  -Dflac=disabled \
  -Dfluidsynth=disabled \
  -Dgme=disabled \
  -Diconv=disabled \
  -Dicu=disabled \
  -Did3tag=disabled \
  -Diso9660=disabled \
  -Djack=disabled \
  -Dlame=disabled \
  -Dlibmpdclient=disabled \
  -Dlibsamplerate=disabled \
  -Dmad=disabled \
  -Dmikmod=disabled \
  -Dmms=disabled \
  -Dmodplug=disabled \
  -Dmpcdec=disabled \
  -Dmpg123=disabled \
  -Dnfs=disabled \
  -Dopenal=disabled \
  -Dopus=disabled \
  -Doss=disabled \
  -Dpcre=disabled \
  -Dpulse=disabled \
  -Dqobuz=disabled \
  -Dshine=disabled \
  -Dshout=disabled \
  -Dsidplay=disabled \
  -Dsmbclient=disabled \
  -Dsndfile=disabled \
  -Dsndio=disabled \
  -Dsolaris_output=disabled \
  -Dsoundcloud=disabled \
  -Dsoxr=disabled \
  -Dsystemd=disabled \
  -Dtidal=disabled \
  -Dtremor=disabled \
  -Dtwolame=disabled \
  -Dudisks=disabled \
  -Dupnp=disabled \
  -Dvorbis=disabled \
  -Dvorbisenc=disabled \
  -Dwavpack=disabled \
  -Dwebdav=disabled \
  -Dwildmidi=disabled \
  -Dyajl=disabled \
  -Dzeroconf=disabled \
  -Dzlib=disabled \
  -Dzzip=disabled

meson configure output/release

ninja -C output/release

The binary is output/release/mpd. Move it to /usr/bin/.

Cleanup

Remove build tools and dev libraries:

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apk del build-base boost ninja boost-dev meson alsa-lib-dev sqlite-dev ffmpeg-dev

Install Binary Dependency

Basically the non-dev version used during compilation.

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apk add sqlite-libs alsa-lib alsa-utils ffmpeg

alsa-utils

This is Linux “sound driver”. Use alsamixer to configure and un-mute the master volume.

Configure

My mpd.conf:

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music_directory         "/home/<user>/.mpd/Music"
playlist_directory      "/home/<user>/.mpd/playlists"
log_file                "syslog"
pid_file                "/home/<user>/.mpd/mpd.pid"
state_file              "/home/<user>/.mpd/mpd.state"
sticker_file            "/home/<user>/.mpd/mpd.sticker"
user                    "<user>"
group                   "audio"
bind_to_address         "::"
port                    "6600"
log_level               "default"
auto_update             "yes"
database {
        plugin "simple"
        path "/home/<user>/.mpd/mpd.db"
}
audio_output {
        type            "alsa"
        name            "ALSA"
        auto_format     "no"
        auto_channels   "no"
        auto_resample   "no"
}

Must add <user> to group audio, else mpd cannot connect to ALSA device.

Result

MPD features is cut to the bare minimum, a music player that can be control remotely from my main desktop with GUI or command line, and from my phone. CPU usage remain ~2% when playing on my 10yrs old laptop.

John Siu

Update: 2020-08-28
Tag
[mpd]
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