GNU bug report logs - #40832
alsa-lib cannot find its plugins

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Package: guix; Reported by: Leo Famulari <leo@HIDDEN>; dated Fri, 24 Apr 2020 21:38:02 UTC; Maintainer for guix is bug-guix@HIDDEN.
Changed bug title to 'alsa-lib cannot find its plugins' from 'Audacity does not work with PulseAudio' Request was from Leo Famulari <leo@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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Date: Sat, 25 Apr 2020 00:03:41 -0400
From: Leo Famulari <leo@HIDDEN>
To: 40832 <at> debbugs.gnu.org
Subject: Re: Audacity does not work with PulseAudio
Message-ID: <20200425040341.GA24170@HIDDEN>
References: <20200424231524.GA16696@HIDDEN>
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On Fri, Apr 24, 2020 at 07:15:24PM -0400, Leo Famulari wrote:
> ------
> ALSA lib conf.c:3683:(snd_config_hooks_call) Cannot open shared library libasound_module_conf_pulse.so (/gnu/store/nyylgcnzmbw8wrn4sna2crl0g7zxxh33-alsa-lib-1.2.2/lib/alsa-lib/libasound_module_conf_pulse.so: libasound_module_conf_pulse.so: cannot open shared object file: No such file or directory)
> ------

alsa-lib looks for this based on the compile-time constant
ALSA_PLUGIN_DIR, set during configure using --with-plugindir.

This is tricky because alsa-plugins depends on alsa-lib, and there are
also other packages that can provide plugins, like bluez-alsa.

Nixpkgs used to patch alsa-lib to look things up at runtime with an
environment variable, but stopped for some reason. That discussion even
points back to Guix periodically, but no solutions:

https://github.com/NixOS/nixpkgs/issues/6860




Information forwarded to bug-guix@HIDDEN:
bug#40832; Package guix. Full text available.

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Date: Fri, 24 Apr 2020 19:15:24 -0400
From: Leo Famulari <leo@HIDDEN>
To: 40832 <at> debbugs.gnu.org
Subject: Re: Audacity does not work with PulseAudio
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When Audacity starts, it prints this line:

------
ALSA lib conf.c:3683:(snd_config_hooks_call) Cannot open shared library libasound_module_conf_pulse.so (/gnu/store/nyylgcnzmbw8wrn4sna2crl0g7zxxh33-alsa-lib-1.2.2/lib/alsa-lib/libasound_module_conf_pulse.so: libasound_module_conf_pulse.so: cannot open shared object file: No such file or directory)
------

But, this file exists in the "pulseaudio" output of alsa-plugins, not
alsa-lib:

/gnu/store/pwsz9hf66na0s9x3ay9qk02vk8l4v8vi-alsa-plugins-1.2.2-pulseaudio/lib/alsa-lib/libasound_module_conf_pulse.so

On Debian, this library is found at:

/usr/lib/x86_64-linux-gnu/alsa-lib/libasound_module_conf_pulse.so




Information forwarded to bug-guix@HIDDEN:
bug#40832; Package guix. Full text available.

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Date: Fri, 24 Apr 2020 17:37:27 -0400
From: Leo Famulari <leo@HIDDEN>
To: bug-guix@HIDDEN
Subject: Audacity does not work with PulseAudio
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Since I can remember, Guix's Audacity doesn't work with PulseAudio on my
foreign distro (Debian).

Debian's Audacity does work correctly in this regard.

In practice, this means that I cannot play or record audio in Audacity
while any other application is using sound on the system. If I close or
stop those other applications, then Audacity is able to select the
'sysdefault' output sound device and can start working.

I found a few discussions about similar issues [0], and it seems that
Audacity needs alsa-plugins in order to make this work.

I tried installing Audacity along side alsa-plugins,
alsa-plugins:pulseaudio, and pulseaudio, as well as building with them
as dependencies, but it still didn't work.

[0] e.g. https://forum.audacityteam.org/viewtopic.php?t=89278




Acknowledgement sent to Leo Famulari <leo@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-guix@HIDDEN. Full text available.
Report forwarded to bug-guix@HIDDEN:
bug#40832; Package guix. Full text available.
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