On Donnerstag, 4. November 2021 17:43:39 CET Sawyer Bergeron wrote:
> That does seem to be the case,
>
> ldd (which qjackctl) | grep jack
>
> > > libjack.so.0 => /usr/lib/pipewire-0.3/jack/libjack.so.0
> >
> > (0x00007f3af17ae000)
>
> ldd (which linuxsampler) | grep jack
>
> > > libjack.so.0 => /usr/lib/libjack.so.0 (0x00007f603e3cc000)
>
> This is rather strange. Those other applications aren't different from the
> ones that I ran directly on top of normal jack2, how is linuxsampler doing
> library discovery here?
> I'm reasonably confident there isn't any compile time pipewire-specific
> stuff, since when switching from jack to pipewire I didn't have to
> reinstall any of these packages. I'm using the pipewire-jack-dropin package
> that gives extra config args to ld:
> https://aur.archlinux.org/cgit/aur.git/tree/PKGBUILD?h=pipewire-dropin
I haven't looked into pipewire before. But from what I see (not verified) they
solved it like this: JACK client apps are supposed to link against the
pipewire version of the JACK client lib (i.e. /usr/lib/pipewire-0.3/jack/
libjack.so.0) instead of the official JACK client lib (i.e. /usr/lib/
libjack.so.0).
And yes, pipewire-jack-dropin apparently is intended to make this working for
existing JACK clients as well without recompiling them, by installing a config
file to /etc/ld.so.conf.d/ which in turn would override/remap the linker path
to the JACK client lib.
But your other apps are apparently not using that ld.so.conf.d mechanism which
ldd output proofs. They are directly linked to pipewire's lib instead. So
chances are that something with your pipewire-jack-dropin is incorrect. It may
be a path has simply changed for instance (e.g. there is pipewire version
number in the path).
So you either figure out what's wrong with the ld.so.conf.d file, or you
recompile LS and replace in configure.ac the line
PKG_CHECK_MODULES(JACK, jack, have_jack=1, have_jack=0)
to search and link against pipewire's lib directly at compile time instead.
You might also check what other audio apps are doing at compile time. Probably
they already changed their configure script to search for both, the official
JACK and pipewire's JACK and pick automatically either one available at
compile time.
CU
Christian
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