Re: Jack & pulse...knickers in a twist.

[Mac <macdroid53@xxxxxxxxx>]

Ok, so I modified my script to:

#!/bin/bash
set -x
killall -9 jackd jackdbus
jack_control ds alsa dps capture none dps playback none
jack_control dps device hw:PCH
jack_control dps rate 48000
jack_control dps nperiods 2
jack_control dps period 256
jack_control start
pactl unload-module module-udev-detect
pactl unload-module module-alsa-card
pactl unload-module module-jackdbus-detect
pactl load-module module-jack-sink client_name=PulseOut channels=2 connect=no
pactl load-module module-jack-source client_name=PulseIn channels=2 connect=no

jack_connect system:capture_1 PulseIn:front-left
jack_connect system:capture_2 PulseIn:front-right
jack_connect PulseOut:front-left system:playback_1
jack_connect PulseOut:front-right system:playback_2
set +x

This produces exactly what I'd expect and, so far, appears well behaved and reproducable.

But, some questions:

1.) The pulse in/out are labelled front-left, front-right.

The script does not mention these labels, so where did they come from.

(There nothing in the output of aplay -l or -L with these either.)

(And, where does playback_1/_2 come from?)

2.) Aplay -l or -L lists a bunch of devices. For example PCH is actually capable of surround sound and there are 2 hdmi devices, and there is spdif as well.

How do I get system:xxxx to show more of the on board outputs?

On Mon, Jun 4, 2018 at 3:46 PM, Len Ovens <len@xxxxxxxxxxxxx> wrote:

On Mon, 4 Jun 2018, Mac wrote:

Ok, so I'm trying to set this up so I control things with a script file.

I have a script that sets various parameters with jack_control.

I was attempting to start my own paulse audio sink/source, but when I do I get 2
sinks/sources, and (I'm guessing) pulse is confused as to the default
connections.
So, when, for example, I start a browser and youtube, it doesn't play.

:)

I did some googling, but, none of the files they say to change are on this
system. So, where is the paulse auto start configured and started? It does show
up in ps aux, so something is doing it.

I wuld not (and do not) change any system settings as this will produce errors when pulse is upgraded by apt.

The script:

#!/bin/bash
jack_control start
jack_control ds alsa dps capture none dps playback none
jack_control dps device hw:PCH
jack_control dps rate 48000
jack_control dps nperiods 2
jack_control dps period 256

I personally would start the script with:
killall -9 jackd jackdbus

That gets rid of any jack processes started by someone else.

Next thing is that you need to move the jack_control start line to the end of your jack_control lines otherwise the settings after that will not be used.

So:
#!/bin/bash
killall -9 jackd jackdbus
jack_control ds alsa dps capture none dps playback none
jack_control dps device hw:PCH
jack_control dps rate 48000
jack_control dps nperiods 2
jack_control dps period 256
jack_control start

Then I remove pulse's connection to anything alsa:
pactl unload-module module-udev-detect
pactl unload-module module-alsa-card

Those two lines mean that the only output pulse can find is jack and so pulse defaults to the jack bridge all the time. Removing any path to an alsa device also allows jack to run in freewheel mode without crashing because pulse will try to use an alsa device for sync :P

In my case, I also unload the jackdetect module because I want my jack-pa bridge to be specific:
pactl unload-module module-jackdbus-detect

Then in place of the above module I do:
pactl load-module module-jack-sink client_name=PulseOut channels=2 connect=no
pactl load-module module-jack-source client_name=PulseIn channels=2 connect=no

I use the connect=no because my outputs are not always 1 and 2 they may be 9 and 10 if I am using s/pdif.

Then I use jack_connect to connect what ports I do want

jack_connect system:capture_1 PulseIn:front-left
jack_connect system:capture_2 PulseIn:front-right
jack_connect PulseOut:front-left system:playback_9
jack_connect PulseOut:front-right system:playback_10

I have shown one config only in my case the last line might look more like:
jack_connect PulseOut:front-right ${device}:playback_${o_port_r}
(well actually most of the above lines would have variables inserted)


--
Len Ovens
www.ovenwerks.net

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