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JACK is a low-latency audio server, written primarily for Linux. It can
-connect a number of different applications to an audio device, as well
-as allow them to share audio among themselves. Its clients can run in
-their own processes (ie. as a normal application) or they can run within
-a JACK server instance (i.e. as a "plugin").
+connect a number of different applications to an audio device, as well as
+allow them to share audio among themselves. Its clients can run in their
+own processes (ie. as a normal application) or they can run within a JACK
+server instance (i.e. as a "plugin").
-Jack uses /dev/shm as a temporary directory for its processes; this is a
-relatively new change, as it used to use /mnt/ramfs. You may pass an
-alternate location as JACKTMP when executing the script. For example:
- JACKTMP=/mnt/tmp jack-audio-connection-kit.SlackBuild
-Assuming you use the default /dev/shm as temporary directory, be sure you
-have an appropriate line in /etc/fstab to mount it:
- tmpfs /dev/shm tmpfs defaults 0 0
-If you don't accept the script's default, you'll need to have the appropriate
-mountpoint set up in fstab and mounted, but a discussion of how to do that
-is outside the scope of this document.
-
-jackd has to run with realtime priviledges. One way to do this on Slackware would
-be to use set_rlimits. Since 12.2 there's another way, though experimental. If
-you have a filesystem that supports posix capabilities (reiserfs does not), you
-can grant jackd the rights to run in realtime mode, even when started as normal user
-with the following command:
+jackd has to run with realtime priviledges. One way to do this on Slackware
+would be to use set_rlimits. Since 12.2 there's another way. If you have
+a filesystem that supports posix capabilities (reiserfs does not), you
+can grant jackd the rights to run in realtime mode, even when started as
+normal user with the following command:
setcap cap_ipc_lock,cap_sys_nice=ep /usr/bin/jackd
-jack optionally uses libsndfile which is also available at SlackBuilds.org.
+If you use qjackctl to start jack, it will need the same capabilities set
+to be able to start jack as non-root user. You can use the same command
+just with 'qjackctl' instead of 'jackd'
+
+jack optionally uses libsndfile, libffado and celt, which are all available
+at SlackBuilds.org.