shairport-sync/BUILD.md

Build and Install Shairport Sync

This guide is for a basic installation of Shairport Sync in a recent (2018 onwards) Linux or FreeBSD.

Shairport Sync can be built as an AirPlay 2 player (with some limitations) or as "classic" Shairport Sync – a player for the older, but still supported, AirPlay (aka "AirPlay 1") protocol. Check "What You Need" for some basic system requirements.

Overall, you'll be building and installing two programs – Shairport Sync itself and NQPTP, a companion app that Shairport Sync uses for AirPlay 2 timing. If you are building classic Shairport Sync, NQPTP is unnecessary and can be omitted.

In the commands below, note the convention that a # prompt means you are in superuser mode and a $ prompt means you are in a regular unprivileged user mode. You can use sudo ("SUperuser DO") to temporarily promote yourself from user to superuser, if permitted. For example, if you want to execute apt-get update in superuser mode and you are in user mode, enter sudo apt-get update.

1. Prepare

Remove Old Copies of Shairport Sync

Before you begin building Shairport Sync, it's best to remove any existing copies of the application, called shairport-sync. Use the command $ which shairport-sync to find them. For example, if shairport-sync has been installed previously, this might happen:

$ which shairport-sync
/usr/local/bin/shairport-sync

Remove it as follows:

# rm /usr/local/bin/shairport-sync

Do this until no more copies of shairport-sync are found.

Remove Old Service Files

You should also remove any of the following service files that may be present:

• /etc/systemd/system/shairport-sync.service
• /etc/systemd/user/shairport-sync.service
• /lib/systemd/user/shairport-sync.service
• /etc/init.d/shairport-sync

New service files will be installed if necessary at the # make install stage.

Reboot after Cleaning Up

If you removed any installations of Shairport Sync or any of its service files in the last two steps, you should reboot.

2. Get Tools and Libraries

Okay, now let's get the tools and libraries for building and installing Shairport Sync (and NQPTP).

Debian / Raspberry Pi OS / Ubuntu

# apt update
# apt upgrade # this is optional but recommended
# apt install --no-install-recommends build-essential git xmltoman autoconf automake libtool \
    libpopt-dev libconfig-dev libasound2-dev avahi-daemon libavahi-client-dev libssl-dev libsoxr-dev \
    libplist-dev libsodium-dev libavutil-dev libavcodec-dev libavformat-dev uuid-dev libgcrypt-dev xxd

If you are building classic Shairport Sync, the list of packages is shorter:

# apt update
# apt upgrade # this is optional but recommended
# apt-get install --no-install-recommends build-essential git xmltoman autoconf automake libtool \
    libpopt-dev libconfig-dev libasound2-dev avahi-daemon libavahi-client-dev libssl-dev libsoxr-dev

Fedora

For AirPlay 2 operation, before you install the libraries, please ensure the you have enabled RPM Fusion software repositories at least to the "Free" level. If this is not done, FFmpeg libraries will be installed that lack a suitable AAC decoder, preventing Shairport Sync from working in AirPlay 2 mode.

# yum update
# yum install make automake gcc gcc-c++ \
    git xmltoman autoconf automake avahi-devel libconfig-devel openssl-devel popt-devel soxr-devel \
    ffmpeg ffmpeg-devel libplist-devel libsodium-devel libgcrypt-devel libuuid-devel vim-common \
    alsa-lib-devel

If you are building classic Shairport Sync, the list of packages is shorter:

# yum update
# yum install make automake gcc gcc-c++ \
    git xmltoman autoconf automake avahi-devel libconfig-devel openssl-devel popt-devel soxr-devel \
    alsa-lib-devel

Arch Linux

After you have installed the libraries, note that you should enable and start the avahi-daemon service.

# pacman -Syu
# pacman -Sy git base-devel alsa-lib popt libsoxr avahi libconfig \
    libsndfile libsodium ffmpeg vim libplist

If you are building classic Shairport Sync, the list of packages is shorter:

# pacman -Syu
# pacman -Sy git base-devel alsa-lib popt libsoxr avahi libconfig

Enable and start the avahi-daemon service.

# systemctl enable avahi-daemon
# systemctl start avahi-daemon

FreeBSD

First, update everything:

# freebsd-update fetch
# freebsd-update install
# pkg
# pkg update

Next, install the Avahi subsystem. FYI, avahi-app is chosen because it doesn’t require X11. nss_mdns is included to allow FreeBSD to resolve mDNS-originated addresses – it's not actually needed by Shairport Sync. Thanks to reidransom for this.

# pkg install avahi-app nss_mdns

Add these lines to /etc/rc.conf:

dbus_enable="YES"
avahi_daemon_enable="YES"

Next, change the hosts: line in /etc/nsswitch.conf to

hosts: files dns mdns

Reboot for these changes to take effect.

Next, install the packages that are needed for Shairport Sync and NQPTP:

# pkg install git autotools pkgconf popt libconfig openssl alsa-utils \
      libplist libsodium ffmpeg e2fsprogs-libuuid vim

If you are building classic Shairport Sync, the list of packages is shorter:

# pkg install git autotools pkgconf popt libconfig openssl alsa-utils

3. Build

NQPTP

Skip this section if you are building classic Shairport Sync – NQPTP is not needed for classic Shairport Sync.

Download, install, enable and start NQPTP from here.

Shairport Sync

Build and Install

Download Shairport Sync, check out the development branch and configure, compile and install it. Before executing the commands, please note the following:

• If building for FreeBSD, replace --with-systemd with --with-os=freebsd --with-freebsd-service.
• Omit the --with-airplay-2 from the ./configure options if you are building classic Shairport Sync.
• If you wish to add extra features, for example an extra audio backend, take a look at the configuration flags. For this walkthrough, though, please do not remove the --with-alsa flag.

$ git clone https://github.com/mikebrady/shairport-sync.git
$ cd shairport-sync
$ git checkout development
$ autoreconf -fi
$ ./configure --sysconfdir=/etc --with-alsa \
    --with-soxr --with-avahi --with-ssl=openssl --with-systemd --with-airplay-2
$ make
# make install

By the way, the autoreconf step may take quite a while – please be patient!

4. Test

At this point, Shairport Sync should be built and installed but not running. If the user you are logged in as is a member of the unix audio group, Shairport Sync should run from the command line:

$ shairport-sync

• Add the -v command line option to get some diagnostics.
• Add the --statistics option to get some infomation about the audio received.

The AirPlay service should appear on the network and the audio you play should come through to the default ALSA device. (Use alsamixer or similar to adjust levels.)

If you have problems, please check the items in Final Notes below, or in the TROUBLESHOOTING.md guide.

Note: Shairport Sync will run indefinitely -- use Control-C it to stop it.

5. Enable and Start Service

Once you are happy that Shairport Sync runs from the command line, you should Control-C out of it and enable and start the shairport-sync service. This will launch Shairport Sync automatically as a background "daemon" service when the system powers up:

Linux

# systemctl enable shairport-sync

FreeBSD

To make the shairport-sync daemon load at startup, add the following line to /etc/rc.conf:

shairport_sync_enable="YES"

6. Check

Reboot the machine. The AirPlay service should once again be visible on the network and audio will be sent to the default ALSA device.

7. Final Notes

A number of system settings can affect Shairport Sync. Please review them as follows:

Power Saving

If your computer has an Automatic Suspend Power Saving Option, you should experiment with disabling it, because your computer has to be available for AirPlay service at all times.

WiFi Power Management – Linux

If you are using WiFi, you should turn off WiFi Power Management:

# iwconfig wlan0 power off

or

# iw dev wlan0 set power_save off

The motivation for this is that WiFi Power Management will put the WiFi system in low-power mode when the WiFi system is considered inactive. In this mode, the system may not respond to events initiated from the network, such as AirPlay requests. Hence, WiFi Power Management should be turned off. See TROUBLESHOOTING.md for more details.

(You can find WiFi device names (e.g. wlan0) with $ ifconfig.)

Firewall

If a firewall is running (some systems, e.g. Fedora, run a firewall by default), ensure it is not blocking ports needed by Shairport Sync and NQPTP.

8. Connect and enjoy...

Add to Home

With AirPlay 2, you can follow the steps in ADDINGTOHOME.md to add your device to the Apple Home system.

Wait, there's more...

Shairport Sync has many extra features and settings. For instance, you can add an MQTT service, change the AirPlay service name, adjust for delays in other equipment (many TVs and AVRs introduce slight delays in their audio processing chains) and more. Explore runtime settings in /etc/shairport-sync.conf or here. Build configuration flags are here.