Re: Audacity will not work if JACK is running.

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On Fri, Mar 03, 2006 at 02:34:49PM -0500, Hector Centeno-Garcia wrote:
> Christoph Eckert wrote:
> >>Audacity is not JACK-enabled: you need to stop JACK running to be
> >>able to use Audacity. Audacity looks to access the soundcard but
> >>can't because JACK is using it when it is running.
> >AFIR there have been rumors that Audacity CVS has JACK support?
> >Best regards

There is a debian package of 1.2.4b built with a fairly recent
portaudio-v19 snapshot, and hence jack support on debrfa:

ftp://ftp.techweb.rfa.org/debrfa/dists/sarge/main/binary-i386/

Seems to work ok for us so far. I'm working on a deb of 1.3.0b as well,
but need to get a more recent wxwidgets packaged first. Audacity still
creates new ports, connects them, disconnects them and destroys them on
each read or write. As I understand it this isn't proper jack etiquette,
but it's not clear to me if this is Audacity or Portaudio's problem.

> I got Audacity to use jack some days ago. You can use the stable release 
> and follow these instructions that I found (originally posted by Linton 
> Smith), just replace Audacity-1.2.3 for Audacity-1.2.4b (the latest stable):
> 
> /> To make it work:
> />/ 
> />/ 1. download the latest pa_snapshot_v19 from the PortAudio website.
> />/ 2. Unpack this into Audacity-1.2.3/lib-src/
> />/ 3. Delete the old portaudio-v19 directory
> />/ 3. Rename the portaudio directory portaudio-v19
> />/ 4. configure audacity to build with portaudio-v19
> />/ 	./configure --enable-portaudio=v19
> />/ 5. build audacity
> />/ 	make
> />/ 6. optionally install audacity
> />/ 7. Start the jack daemon
> />/ 	jackd -d alsa
> />/ 8. Start your jack enabled sound sources
> />/ 	hydrogen
> />/ 	rosegarden
> />/ 	timidity -B2,8 -iA -Oj
> />/ 
> />/ 9. Start a jack patch app
> />/ 	jack-patch-bay
> />/ 
> />/ or
> />/ 	qjackctl
> />/ 
> />/ 10. Ensure all jack apps have created their jack client ports.
> />/       Timidity requires a midi input to be connected before it
> />/  creates it's jack output port!
> />/ 
> />/ 11. Once you have all of your Jack apps running with output ports, start
> />/  audacity (portaudio-v19 enabled) Note: if you start it from the 
> command line
> />/  you will see error messages regarding access to the alsa devices
> />/ 
> />/ 12. Open the preferences Audio I/O dialog.  You will now be able to 
> select
> />/  the available jack clients as your recording source.
> />/ 
> />/ 	Note: if you start up more jack clients, they are not detected 
> />/	by audacity.
> />/  You must exit audacity and restart it to detect the new jack clients. 
> :(
> />/  Furthermore, Audacity does not open a jack input port until you hit 
> record
> />/  or play.  When it does it automatically connects them with the selected
> />/  input or output jack client. BUT it closes the ports when 
> playback/record is
> />/  stopped.
> />/ 
> />/ 	MATT/VAUGHAN/DOMENIC: This is not how jack access should 
> />/  work. ports should not go away unless the client(eg audacity)
> />/  is shutdown. The idea is to create them, connect them, then
> />/  use them. this is may or may not be a portaudio problem.  I
> />/  have not looked into Audacity's use of PA and PA_JAck to
> />/  determine where the fault is but it is possible that it is
> />/  in EITHER audacity's use of PA or PA's use of Jack. We would
> />/  greatly appreciate it if you would take a look and see IF
> />/  your use of PA needs to be modified to ensure jack client
> />/  longevity.  I will inform the PA crowd of this as well so that
> />/  they can check their side of things, if I get a chance.
> />/ 
> />/ 	MARCOS: Hope this helps.
> />/ 
> />/ Hasta luego
> />/ 
> />/ Linton/
> 
> 
> 
> It works for me.
> 
> 
> Hector.

-- 
Eric Dantan Rzewnicki  |  Linux Audio Developer and Sysadmin
Technical Operations Division  |  Radio Free Asia
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