[Nix-dev] Is ALSA_PLUGINS_DIR being honoured?

[Carles Pagès]

Debugging a bit, I found out that ALSA_PLUGIN_DIRS is only used in some
code paths. By setting 'lib' in asound.conf, the plugin dirs var is
ignored, but I found in the archlinux wiki an alternative configuration to
make alsa use pa:
pcm.pulse {
  type pulse
}

By using this instead of the pcm_type.pulse {lib...}, and pointing
ALSA_PLUGIN_DIRS to the proper path, everything works and this can easily
be overriden by i686 apps. Can we use this configuration then?

I looked at the value set for ALSA_PLUGIN_DIRS, which points to the current
profiles lib dirs. I'm not sure, though, why the alsa plugins are not
symlinked in there or if they should be at all. Anyone?


2013/2/22 Carles Pagès <page.lists at gmail.com>

> Hi,
>
> Trying to make the flashplayer plugin work in steam, I discovered all the
> tricks that we have in place for sound to work in nixos. However, I'm not
> sure the patch we have for ALSA_PLUGINS_DIR is working.
>
> I have pulseaudio enabled in nixos, and I saw that packages that don't
> understand pa get routed to it anyway through the config in
> /etc/asound.conf. The problem comes when the app in question is x86 and my
> system is x86_64, as the plugins obviously fail to load (this is why skype
> sound was failing without pa enabled).
>
> To cut a long story short, I tried hand-editing /etc/asound.conf to remove
> the absolute path, and only leave the plugin.so name there. I then did some
> tests with mplayer which lets me easily choose the audio output, by setting
> ALSA_PLUGINS_DIR pointing to alsaplugins path. Result: no sound. I did an
> strace and the plugins are not searched in there. I did a quick test adding
> the alsaplugins path to LD_LIBRARY_PATH, and sound was working again.
>
> So,  did I get anything wrong or is the ALSA_PLUGINS_DIR trick not working?
>
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