docs: add audio explanation

[davidekete]

Closes issue #197 @edibotopic

[davidekete]

Hi @edibotopic, I'm done with @eeickmeyer comments. Feel free to take a look now.

[eeickmeyer]

Just a little bit that might be important: pipewire-jack is neither installed by default, nor does installing it actually do anything useful.

However, there is a file, on amd64 systems in /usr/share/doc/pipewire/examples/ld.so.conf.d called pipewire-jack-x86_64-linux-gnu.conf that simply contains the following:

/usr/lib/x86_64-linux-gnu/pipewire-0.3/jack/

In the package ubuntustudio-pipewire-config, we make a symlilnk:

ln -fs /usr/share/doc/pipewire/examples/ld.so.conf.d/pipewire-jack-*-linux-gnu.conf \
			/etc/ld.so.conf.d/pipewire-jack.conf

Once that is done, an ldconfig trigger runs which pieces everything together and suddenly JACK applications think JACK is running.

Source for that is here: https://git.launchpad.net/ubuntustudio-default-settings/tree/debian/ubuntustudio-pipewire-config.postinst

So, while installing pipewire-jack alone doesn't do anything useful, installing ubuntustudio-pipewire-config finishes the process. I'm not sure how useful that is outside of professional audio applications, but that's the magic behind what makes Ubuntu Studio so great.

[davidekete]

Just a little bit that might be important: pipewire-jack is neither installed by default, nor does installing it actually do anything useful.

However, there is a file, on amd64 systems in /usr/share/doc/pipewire/examples/ld.so.conf.d called pipewire-jack-x86_64-linux-gnu.conf that simply contains the following:

/usr/lib/x86_64-linux-gnu/pipewire-0.3/jack/

In the package ubuntustudio-pipewire-config, we make a symlilnk:

ln -fs /usr/share/doc/pipewire/examples/ld.so.conf.d/pipewire-jack-*-linux-gnu.conf \
			/etc/ld.so.conf.d/pipewire-jack.conf

Once that is done, an ldconfig trigger runs which pieces everything together and suddenly JACK applications think JACK is running.

Source for that is here: https://git.launchpad.net/ubuntustudio-default-settings/tree/debian/ubuntustudio-pipewire-config.postinst

So, while installing pipewire-jack alone doesn't do anything useful, installing ubuntustudio-pipewire-config finishes the process. I'm not sure how useful that is outside of professional audio applications, but that's the magic behind what makes Ubuntu Studio so great.

Thanks for pointing it out. I'll add a note for it soon.

[davidekete]

Just a little bit that might be important: pipewire-jack is neither installed by default, nor does installing it actually do anything useful.
However, there is a file, on amd64 systems in /usr/share/doc/pipewire/examples/ld.so.conf.d called pipewire-jack-x86_64-linux-gnu.conf that simply contains the following:

/usr/lib/x86_64-linux-gnu/pipewire-0.3/jack/

In the package ubuntustudio-pipewire-config, we make a symlilnk:

ln -fs /usr/share/doc/pipewire/examples/ld.so.conf.d/pipewire-jack-*-linux-gnu.conf \
			/etc/ld.so.conf.d/pipewire-jack.conf

Once that is done, an ldconfig trigger runs which pieces everything together and suddenly JACK applications think JACK is running.
Source for that is here: https://git.launchpad.net/ubuntustudio-default-settings/tree/debian/ubuntustudio-pipewire-config.postinst
So, while installing pipewire-jack alone doesn't do anything useful, installing ubuntustudio-pipewire-config finishes the process. I'm not sure how useful that is outside of professional audio applications, but that's the magic behind what makes Ubuntu Studio so great.

Thanks for pointing it out. I'll add a note for it soon.

@eeickmeyer Done.