[pulseaudio-discuss] module-switch-on-connect: handling virtual sinks

Georg Chini georg at chini.tk
Sat Nov 11 12:22:59 UTC 2017

On 11.11.2017 13:03, Михаил Новоселов, Думалогия wrote:
> Yes, of course, it's possible to unload module-switch-on-connect, but 
> that is breaking the existimg user setup.
> "a command line switch could be added
> to the module so that it ignores virtual sinks" Will be best. Does 
> this flag exist now?

Please don't top post on that list. No, such a flag does not exist right now
but it can be added rather easily. I'll send you an untested patch, please
check if it works as expected.

> 11 ноября 2017 г. 14:26:21 GMT+03:00, Georg Chini <georg at chini.tk> пишет:
>     On 11.11.2017 05:28, Михаил Новоселов, Думалогия wrote:
>         Hello, PulseEffects, an application, that can apply different
>         effects or equalize both input and output sound, cannot work
>         properly when module-switch-on-connect is on. PulseEffects
>         creates a virtual sinks, but PulseAudio's
>         module-switch-on-connect makes it a default sinks
>         automatically what severely breaks the logic of PulseEffect's
>         work. Please see
>         https://github.com/wwmm/pulseeffects/issues/99 1) Can we
>         specify that the created sink is a virtual one? 2) Maybe there
>         are other ways to prevent module-switch-on-connect from making
>         a newly created virtual device a default one? I wrote the
>         script Dumacast https://github.com/mikhailnov/dumacast (first
>         of all for my company's (Dumalogiya, http://думалогия.рф)
>         internal usage), and starting with the newest version of
>         Ubuntu, where module-switch-on-connect is on, I ran into the
>         same troubles. My script
>         https://github.com/mikhailnov/dumacast/blob/master/usr/bin/dumacast
>         creates virtual sinks via pactl (lines 135-149), and they are
>         also made default and break the logic of how the script works.
>         I currently have no idea how to handle it without unloading
>         module-switch-on-connect. I tried both Ubuntu's 17.10 default
>         PulseAudio and built from dEbian sources PulseAudio 11, the
>         situation is the same with them both. What can be done?
>     Do you really need module-switch-on-connect? If not, you could just
>     check with
>     "pactl list modules short" if the module is loaded and unload it prior
>     to starting
>     your application. You can also remove it fromdefault.pa <http://default.pa>, so that it
>     never gets
>     loaded.
>     If you need module-switch-on-connect, a command line switch could be added
>     to the module so that it ignores virtual sinks. The default behavior
>     however can
>     not be changed, because other applications might rely on the current setup.
>     Regards
>                    Georg
> -- 
> Простите за краткость, создано в K-9 Mail. 

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