Date: Sat, 18 May 2013 17:02:52 +1000 (EST) From: Ian Smith <smithi@nimnet.asn.au> To: sbruno@freebsd.org Cc: freebsd-multimedia@freebsd.org Subject: Re: jackd Message-ID: <20130518154752.W86776@sola.nimnet.asn.au> In-Reply-To: <1368803054.1374.8.camel@localhost> References: <1368803054.1374.8.camel@localhost>
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On Fri, 17 May 2013 08:04:14 -0700, Sean Bruno wrote: > I'm working on a port of IDJC, which requires jackd. > > At this point, I'm stuck on two jackd related issues. > > 1. How do I configure freebsd+jackd for realtime audio? Currently I > have to configure my .jackdrc to disable realtime audio, e.g. > /usr/local/bin/jackd -r -T -d oss Just wondering what problems are evident running it without rtprio? I gather -r with no value gives 48000, how many consumers? Just that even on an old 2GHz P4 on debian 4, we found no real issues running without -R that tuning buffer sizes etc wouldn't fix; FM pre-transmitter feeding an audio logging task (darkice to mp3 VBR -q0 @ ~210kbps) and our stream feed (patched edcast_jack to mp3 VBR -q2 @ ~192kbps) ALSA, though. That said, we wound up using -R anyway (both consumers running as root) but it made no noticeable difference with that load: /etc/default/jackd OPTIONS="-R -m -d alsa -d hw:0 -C hw:0 -r 44100 -n 3 -p 4096" PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 16483 root 15 0 41252 3456 1580 S 8.2 0.7 173:15.30 edcast_jack 3032 root 15 0 25752 3576 1940 S 7.4 0.7 2583:03 darklogger 3002 root 22 0 37740 3612 3312 S 0.2 0.7 44:29.66 jackd 1491 root 25 10 2232 1140 864 R 0.2 0.2 0:00.96 top Re what Diane said, that seems also to be the case on linux, though I know nothing about our jackd port or what can be done here on FreeBSD. -R, --realtime Use realtime scheduling. This is needed for reliable low-latency performance. On most systems, it requires jackd to run with special scheduler and memory allocation privileges, which may be obtained in several ways. The simplest, and least-secure method is to run jackd with root privileges. This means that all JACK clients must also run as root. With a Linux 2.6 kernel, ordinary users can run jackd and its clients using options of the realtime LSM. Linux 2.4 kernels need "POSIX draft capabilities" enabled (see the <linux/capability.h> include file). Using that method, ordinary users who invoke the daemon using jackstart, can later launch JACK clients without running them as root. See http://jackit.sourceforge.net/docs/faq.php#a52 for more information. > 2. Any clues on getting the microphone working with jackd? My > microphones work fine under audacity, but I don't seem to be able to get > any audio from microphones. > > Sean No idea sorry, and while interested, sadly no time to play with these: > http://people.freebsd.org/~sbruno/idjc/ > http://people.freebsd.org/~sbruno/shoud-idjc/ 404. http://people.freebsd.org/~sbruno/shout-idjc/ works :) cheers, Ian
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