31 Mar
2013
31 Mar
'13
11:05 p.m.
On 03/22/2013 11:51 PM, Jeremy Jongepier wrote:
I'm trying to run jackd from a script that is
triggered by udev. But
when I try to do so jackd complains:
jackd 0.122.0
...
JACK is running in realtime mode, but you are not allowed to use
realtime scheduling.
...
But the user trying to run jackd (pi) is a member of the audio group.
The udev rule looks like this:
ATTRS{idVendor}=="0218", ATTRS{idProduct}=="0001",
ACTION=="change",
RUN+="/usr/bin/sudo -u pi -s /home/pi/bin/drumpad"
Is this maybe related to using sudo? I'd like to get this working, the
idea is that whenever I plug in my drumpad the udev rule and thus the
script gets executed. The script checks if jackd is already started and
then moves on starting up jalv with the drumkv1 plug-in. The script
itself works fine, it's just the udev part that got me puzzled.
Thanks!
Jeremy
The script works now except for one thing, the JACK connections do not
get set up when I boot with the drumpad attached. After having logged in
I still can't set up the connections because either jack_connect and
aj-snapshot complain that JACK is not running while it does run and it
runs as the user I'm logged in with.
This is the script I've fabricated:
https://raw.github.com/AutoStatic/scripts/rpi/rpi/drumpad
I've attached a JACK log of booting with the drumpad attached. JACK
starts successfully, so do all clients but the connections are not set
up. If I then log in and do a jack_lsp -c I get the following back:
pi@jj-rpi ~ $ jack_lsp -c
JACK server not running
Something similar happens when I boot without the drumpad attached and
attach the drumpad when booted. Then I have to wait a while before I can
make the connections (hence the sleep 10 command before calling
aj-snapshot). It'd be nice if I could check somehow if JACK is ready to
make connections.
Anyone any idea? Thanks in advance.
Jeremy