Re: System-wide PulseAudio instance with realtime priority as non-root from systemd

[Jürgen Herrmann <t-5@xxxxxx>]

Look here: https://t-5.eu/hp/Software/Pulseaudio%20Crossover%20Rack/OnlineHelp/#scheduling

Best regards, Jürgen

Am 30. Oktober 2020 23:13:55 schrieb Matt Garman <matthew.garman@xxxxxxxxx>:

My use case is as follows: I am trying to set up a Raspberry Pi as a

sound server for my Linux PC.  My Linux PC will use PulseAudio's

networking capability to send the audio to the Raspberry Pi, which is

connected to a stereo system.

All the examples I've found online for doing this seem to suggest

running the PulseAudio instance on the RPi in system mode.  But with

all the warnings about system mode, I thought I'd try to achieve this

running Pulse in user mode.

Furthermore, I want to have Pulse start automatically at boot time on

the RPI, and run with real time priority.  I want PulseAudio to run as

user "pulse".

I have this in /etc/security/limits.conf:

pulse   -       rtprio 90

pulse   -       nice    -19

And this in /etc/pulse/daemon.conf

realtime-scheduling = yes

realtime-priority = 5

And it seems to work as expected when launched from the CLI:

# runuser -u pulse -- /usr/bin/pulseaudio --daemonize=no

--disallow-module-loading --disallow-exit=yes --disable-shm=no

--verbose

Pulse prints this when starting:

I: [pulseaudio] core-util.c: Successfully gained nice level -11

And looking at the process via "top" or "ps" shows that it is indeed

running as the user "pulse".

I have this in my systemd service file:

[Service]

User=pulse

Group=pulse

Type=simple

BusName=org.pulseaudio.Server

ExecStartPre=/bin/mkdir -p /var/run/pulse

ExecStartPre=/bin/chown -R pulse:pulse /var/run/pulse

ExecStart=/usr/bin/pulseaudio --daemonize=no --disallow-module-loading

--disallow-exit=yes --disable-shm=no --verbose

Restart=always

And when I to "systemctl start pulseaudio", it starts, but not with

realtime priority, and I have this in journalctl:

Oct 30 17:09:00 dietpi-music pulseaudio[1104]: I: [pulseaudio] main.c:

setrlimit(RLIMIT_NICE, (31, 31)) failed: Operation not permitted

Oct 30 17:09:00 dietpi-music pulseaudio[1104]: I: [pulseaudio] main.c:

setrlimit(RLIMIT_RTPRIO, (9, 9)) failed: Operation not permitted

What am I missing?

Thanks,

Matt

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