[LAD] JACK on Raspberry Pi

Lars-Erik Helander lehswe at gmail.com
Fri Sep 14 14:57:45 UTC 2012

I have the same problem and from what I understand, the problem is that the alsa driver for the rpi lacks functionality ( mmap support) required by jack.

I was thinking about writing a new jackd driver backend using the omxlayer available on the rpi, and bypassing alsa, but before doing that I would need to know more about the jackd driver interface and what functions would be required to implement. I am only interested in audio output, so my aim was to limit the driver to the required output functions.

Any help, suggestions or guidance would be most welcome.



Skickat från min iPhone

14 sep 2012 kl. 12:39 skrev Parisson <lists at parisson.com>:

> Hi!
> I'm trying to get JACK working on this great tiny box:
> pi at raspberrypi ~ $ jackd -dalsa
> jackdmp 1.9.9
> Copyright 2001-2005 Paul Davis and others.
> Copyright 2004-2012 Grame.
> jackdmp comes with ABSOLUTELY NO WARRANTY
> This is free software, and you are welcome to redistribute it
> under certain conditions; see the file COPYING for details
> JACK server starting in realtime mode with priority 10
> Cannot lock down 82274202 byte memory area (Cannot allocate memory)
> Bus error
> As ALSA is OK (i.e. aplay is playing good) and RAM=192M, is there any JACK
> parameter I could tune in to reduce the memory size lock?
> This pb seems unresolved yet:
> http://www.raspberrypi.org/phpBB3/viewtopic.php?f=41&t=5787
> Yomguy
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> Linux-audio-dev at lists.linuxaudio.org
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