[Fedora-music-list] fedora 12, Pulseaudio and Jack

[Fernando Lopez-Lezcano]

On Sun, 2010-03-07 at 23:26 -0800, Jeff Sandys wrote:
> On Sun, Mar 7, 2010 at 5:47 PM, Fernando Lopez-Lezcano
> <nando at ccrma.stanford.edu> wrote:
>         On Sat, 2010-03-06 at 12:03 -0800, Jeff Sandys wrote:
>         > In Fedora 12 with Planet CCRMA Jack Audio Connection Kit,
>         does
>         > starting jack with qjackctl suspend pulseaudio?
>         
>         
>         It depends. I don't know what happens if you use the Fedora
>         jack
>         package. If you have the Planet CCRMA jack package (based on
>         jack2)
>         the answer is yes, starting jackd will politely ask pulseaudio
>         to release
>         the card and jackd will be happy. When jackd exits the card is
>         released
>         and pulseaudio grabs it again.
> 
> That's what I thought but couldn't prove it.  I have the ccrma jack,
> can't find jack in fedora.  

The one in Planet CCRMA has a higher e-v-r so you won't see it by
default if you have the Planet CCRMA repositories enabled. There is some
yum incantation option that lets you see all versions, don't remember
it. 

> Using the PD latency test that loops back the output 
> to the input, it shows twice the latency as calculated in qjackctl,
> which makes sense, once for D/A and again for A/D. 
> 
>     > If not, how can I add pulseaudio suspend (and resume) to
> qjackctl?
> 
> 
>         In fc11 where the interface between jackd and pulseaudio had
>         some 
>         bugs I ended up writing a perl script that would do the right
>         thing. I'm
>         attaching it to this email for reference.
>         
>         If the Fedora jack does not interface with pulseaudio you
>         could (as
>         root) "mv /usr/bin/jackd /usr/bin/jackd.bin" and then install
>         the script
>         as /usr/bin/jackd (don't forget to chmod it to 775). Of course
>         this will
>         "break" the rpm package of jackd so if you upgrade jackd you
>         will 
>         need to redo the script again.
> 
> I went straight from fedora 10 to 12 so I didn't try your perl script 
> required for fedora 11.
>  
>         > How can I tell if pulseaudio is running, is there a terminal
>         command
>         > for pulseaudio status?
>         >
>         > I have searched through the jackaudio.org, pulseaudio.org,
>         > qjackctl.sourceforge.net and other sites, and didn't find an
>         obvious
>         > answer.
>         >
>         http://fedorasolved.org/Members/fenris02/pulseaudio-fixes-and-workarounds 
>         
>         > has some info but not about jack.
>         
>         
>         You need to install pulseaudio-utils if it is not there
>         already (BTW,
>         you will need that for the script as well).
>         
>          pactl stat
>         
>         will tell you stuff about pulseaudio...
>
> The reason I ask is I am planning to give a talk about music 
> programming with Planet CCRMA at LinuxFest NorthWest,
> 
> http://linuxfestnorthwest.org/sessions/music-programming-planet-ccrma
> Fernando, I would appreciate your review of my slides when then are
> ready, I don't want to misrepresent CCRMA.  Thanks,

Yes, no problem, let me know when you want me to take a look. 

-- Fernando