[pulseaudio-discuss] On-the-fly changing of sinks or sources in combine- and loopback-modules? Sound-distortions at the beginning of module-loopback?

[Peter Kornatowski]

At 01:23 18.02.2010, you wrote:
>On Thu, 18.02.10 00:09, Peter Kornatowski (pkorn at gmx.net) wrote:
>
> > Hello,
> >
> > 1. Is it possible to change the sinks or sources in an already
> > loaded module-combine or module-loopback without unloading and
> > reloading the module?
>
>Unless otherwise configured module-combine will automatically add all
>new hardware sinks to its outputs and drop those which go away. So
>this automatism does allow sinks/sources to be added
>dynamically/removed dynamically during runtime. However, there is no
>user API for that to trigger that in any way but by
>unplugging/plugging hardware.

I am using the combiner for up to 3 bluetooth-headsets. But I have 
more headsets, so I made a program that waits for bluetooth-signals 
of a headset and then loads the headset through the asynchronous 
PA-api as module-bluetooth-device. Then I am reloading the 
module-combine with a new sink-list. Do you think I can make that 
happen automatically without reloading the module-combine?


>The streams module-loopback uses you can move around with pavucontrol
>or a similar tool.

Can I move it with the asynchronous PA-api? And if yes, how?


> > 2. I also have a problem with sound distortions (mostly much higher
> > and "quicker" voice) several seconds after loading the
> > loopback-module (source is a bluetooth-headset and sink is my
> > soundcard). After some seconds the distortions disappear and
> > everything is fine. I found out that reducing the adjust_time
> > parameter of the loopback-module (I had to add adjust_time to
> > valid_modargs in the source code) also reduces the duration of the
> > distortions, but even at adjust_time=1 they remain for about 2
> > seconds (and pulseaudio uses much more CPU). Setting it to 0 doesn't
> > work at all.
>
>Sounds as if there is something wrong with the device speed. which
>causes PA to compensate by resampling things.

So would it be possible to fix this? Do you need more info/some logs?


Thanks,
Peter