30 Jan
2018
30 Jan
'18
10:58 a.m.
Am Dienstag, 30. Januar 2018 18:38 CET, Christian Affolter
<c.affolter(a)purplehaze.ch> schrieb:
Hi Robert,
On 30.01.2018 18:21, Robert Bielik wrote:
Make sure, that the user which starts jackd is allowed to raise the real
time priority and memlock address space.
See http://jackaudio.org/faq/linux_rt_config.html
Most distributions ship and install a limits.conf snipped file with the
jack package. Here is an example from CentOS/Fedora:
cat /etc/security/limits.d/95-jack.conf
# Default limits for users of jack-audio-connection-kit
@jackuser - rtprio 70
@jackuser - memlock 4194304
In this case, the user has to be in the @jackuser group to be able to
raise the priority.
One important caveat: an often missed bit of information when this configutation is
mentioned is the
fact that this configures the pam_limits PAM module. So: pam needs to be enabled and
configured (most
if not all distros do this) and whatever process need these setting needs to gothrough a
pam session
or inherit/fork of a process that does. A "normal" login will usually do so but
some process started during
bootup or chron or directly started from init/systemd will not. You've been warned
;-)
Cheers, RalfD
2.
recompile jack2 without dbus support
Ok, so I've compiled/installed jack2 without dbus support, and I'm now running
jackd on a RT patched Raspbian Stretch (https://github.com/guysoft/RealtimePi)
And it seems to work wonderfully, no problem reaching buffer sizes below 1 ms. Happy
joy!
I start jack with:
sudo jackd -P70 -d alsa -r 48000 -p 64 &
sudo jack_wait --wait --timeout 10
sudo jack_connect system:capture_1 system:playback_1
sudo jack_connect system:capture_2 system:playback_2
I need sudo, otherwise allocation of shared memory + realtime prio setting fails. And then I've setup the ALSA JACK PCM plugin,
but to use aplay I need to use sudo aswell:
sudo aplay -D pcm.jack /usr/share/sounds/alsa/Front_Center.wav>
Is there a way to set this up so sudo is not needed?
What error message do you get without sudo? Maybe your user has to be in
the "audio" group (or similar).
Regards,
Chris
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