Jack and pulse?

[Kaj Ailomaa]

On Tue, 12 Feb 2013 20:57:18 +0100, Mac <macdroid53 at gmail.com> wrote:

> On 12.x when jack is started by qjackctrl, the local pulse audio
> devices show up as sources and sinks.
>
> I have not dug around and figured that out in depth. That's on my todo  
> list.
>

pulseaudio-module-jack is what does it. It's possible to have PA create  
sink and source for jack manually too, but the module does it  
automatically, whenever you start jackdbus (qjackctl is set to start  
jackdbus by default (Setup -> Misc -> Enable D-Bus Interface).


> In my case I also have an AF12 plugged into the firewire port, so in
> addition to the pulse sinks/sources, 12 sinks and sources show up as
> well.

Think of the PA sink and source as an application connecting to jack.

>
> In addition, I have some scripts that execute when qjack starts that
> add and patch some other apps.
>
> If I boot the pc and start qjack, then start a browser with audio
> content, it comes through the PA source and goes to the rest. This
> works just fine most of the time.
>
> There two situations that cause me some grief:
>
> 1.) If I start the browser content, then start qjackctrl, from that
> point on no audio from the jack side of the house. (The PA side still
> shows, in volume control that it's getting to PA.) I can avoid this by
> having a better memory and remembering to start qjack.

There are one or more bugs causing the exchange between PA and jack not  
work flawlessly, as of yet.

>
> 2.) If for some reason the stream from the browser dies, for example a
> video goes into buffering for too long, the browser and jack appear to
> be hung. (I've seen ffado go south in this case and I don't know how
> to recover it live either.) In this case, my memory won't help...can't
> predict network sluggishness.
>
> In both situations, I've found no way to recover short of reboot.
>
> Is there a way to recover in either case?

Try killing jack with: killall -9 jackdbus

If that doesn't help, make sure to kill jack and also restart PA, by  
killing it.

>
> Regards,
> Mac