Arch, Raspberry PI, MPD, DAC = Hi-Fi

Arch, Raspberry PI, MPD, DAC = Hi-Fi

Yesterday I setup a headless Raspberry PI Arch based MPD server. It was a breeze (for me) and I thought I’d like to share the procedure with you guys. If you intend to use a Debian image the guide below will not work without adapting the configuration for Debian – other guides cover this.

96Khz and 192Khz 24bit files work flawlessly.

Resources:

http://www.musicpd.org/
http://www.raspberrypi.org/downloads/
https://wiki.archlinux.org/
https://wiki.archlinux.org/index.php/Autofs

Hardware

For:

Against:

Guide

  1. Get Arch linux image here: http://www.raspberrypi.org/downloads/
  2. Write image to SD card:
  3. Before booting the Pi the first time it will be helpful to configure wireless using netctl so the machine can be accessed via ssh. 
    sudo mount /dev/mmcblk0p5 /mnt
cd /mnt/etc/netctl
sudo vi wlan0-pi-conf

    Paste and adapt the following configuration to fit your needs:
    Description='Wireless network for my MPD Pi'
Interface=wlan0
Connection=wireless
Security=wpa
ESSID=<your-ssid>
IP=dhcp
Key=<your-wlan-password>

    Save file and cd away from dir.
    Activate profile:
    sudo ln -s /usr/lib/systemd/system/netctl-auto@.service /mnt/etc/systemd/system/multi-user.target.wants/netctl-auto@wlan0.service
sudo umount /mnt
  4. Transfer SD card to you PI and turn on power. Watch the wireless dongle to check for activity.
  5. Scan your network to identify with nmap (adjust ip-range to match your local network): 
    nmap -sP 192.168.0.1-20
  6. ssh to the alarmpi. 
    ssh -l root <alarmpi ip>

    password is root.
  7. Update system:
    Adjust /etc/pacman.d/mirrorlist to a country near you.
    Update system:
    pacman -Syu
reboot

    ssh back in to system after reboot.
  8. Install mpd and mpc: 
    pacman -S mpd mpc alsa-utils

    Edit mpd.conf so it looks like this:
    user "mpd"
pid_file "/run/mpd/mpd.pid"
db_file "/var/lib/mpd/mpd.db"
state_file "/var/lib/mpd/mpdstate"
playlist_directory "/var/lib/mpd/playlists"
music_directory "/media"
mixer_type                   "software"
audio_output {
    type            "alsa"
    name            "Cambridge Audio USB Audio 2.0"
    device          "hw:1,0"
}

    Create media dir
    mkdir /media

    You need to adjust audio_output variables to fit your external DAC and adjust music_directory to where you store your music.
    Read mpd.conf man page for more information on the variables.
    Since mpd will run as mpd change ownership of the mpd dirs:
    chown -R mpd /var/lib/mpd
systemctl enable mpd
systemctl start mpd

    Check for errors:
    journalctl -xn
  9. I've found that autofs is the most reliable solution for removable storage: 
    pacman -S autofs
echo "automount: files" >> /etc/nsswitch.conf
echo "/-     /etc/autofs/auto.rpi" >> /etc/autofs/auto.master
echo "/media/musik -fstype=ext4,async,nodev,nosuid :/dev/sda1" >> /etc/autofs/auto.rpi

    Enable autofs and cd to dir:
    systemctl enable autofs && systemctl start autofs
cd /media/musik
df -h
  10. Set /etc/localtime and setup ntpd (adjust zoneinfo link to your needs): 
    rm /etc/localtime && ln -s /usr/share/zoneinfo/Europe/Copenhagen /etc/localtime
systemctl enable systemd-timesyncd && systemctl start systemd-timesyncd
  11. Install mpdroid or similar app on your phone. Point the app to the ip of your rpi. Bonus info:
    You can add radio channel streams to mpd’s playlists. I’ve only tried m3u links.
    Example for Danish Radio’s Jazz station:
    wget http://live-icy.gss.dr.dk/A/A22H.mp3.m3u && mpc load A22H.mp3.m3u

    Enjoy. If you have any questions please ask.