UPDATE:
There's a thread on the pipewire issue tracker which is related to setting alsa object properties:
https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/731
Fedora Jam 34 comes with pipewire utilities: pw-cli
This runs as a pipewire client object and within it typing 'help' lists all of its commands
'list-objects' provides information on all the devices,nodes and clients. I would use pw-cli instead of 'pactl list'
The pipewire /etc/pipewire/media-session.d/alsa-monitor.conf has a device level setting to ALSA-Card-Profiles for devices which is set to true. For pro-audio type interfaces that may result in the nodes being identified as surround sound (FL, FR, RL, RR) {see: gitlab pipewire issue 731}. I put in a rule to match to my pro-audio card and set this property to 'False':
============================================
matches = [
{
# This matches all cards. These are regular
expressions
# so "." matches one character and ".*" matches
many.
device.name =
"alsa_card.usb-MOTU_M4_M40000048603-00"
}
]
actions = {
# Actions can update properties on the matched object.
update-props = {
# Use ALSA-Card-Profile devices. They use UCM or
# the profile configuration to configure the
device
# and mixer settings.
api.alsa.use-acp = false
===============================================
Now in Carla, the pro-audio interface has a shorter name and the ports are numbered instead of given surround sound positions.
This is closer to what I'd like, although I wish there was a way to rename what shows up in Carla which appears to be its description text.
After making this change here is the source pipewire object from pw-cli list-object:
id 49, type PipeWire:Interface:Node/3
object.path = "alsa:pcm:M4:0:capture"
factory.id = "18"
client.id = "31"
device.id = "43"
priority.session = "1808"
priority.driver = "1808"
node.description = "M Series"
node.name =
"alsa_input.usb-MOTU_M4_M40000048603-00.unknown"
node.nick = "My Node"
media.class = "Audio/Source"
In Carla the node.description, "M Series" is used to name the
source block (and also sink since I made a device level change).
Same for input names in Ardour
Note that I also changed node.nick, but neither Carla or Ardour uses it.
I hope this information is useful.
-Keith
I'm pretty sure that I don't have JACK or Qjackctl on my upgraded fedora 34 system.
Perhaps there is a way via some alsa subsystem approach to rename the sources and sinks. Carla and Ardour identify my MOTU M4 as a surround sound type system, which is incorrect.
On Fri, 2021-04-30 at 00:29 -0300, Rafael Franco wrote:Do you know that devices name can né renamed at qjackctl, i'm just tweaking gere and found that, but I need to verify that these names continue after restarting. I send news here.
Em sex, 30 de abr de 2021 00:21, Keith Smith <Keith@xxxxxxxxxxxxxxxxx> escreveu:
Something is happen with alsa-monitor.conf changes.
The only property that makes a visible change is the "audio.position"
parameter and it only effects the suffix of the device port names.
Changing the node.nick or device.nick doesn't seem to do anything as the
device names in Carla's patchbay, or the listed inputs and outputs
within Ardour are unchanged.
However, My MOTU M4 audio interface source has nodes: capture_FR,
capture_FL, capture_RR, capture_RL if I set:
audio.position = "1,2,3,4"
and restart pipewire
Then those names change to: capture_1, capture_2, capture_3, capture_4
so the match portion within alsa-monitor.config appears to be working.
-Keith
On 4/29/21 12:56 PM, Keith Smith wrote:
> Pipewire seems to work great on my hardware. Already a big
> improvement over JACK-Pulseaudio.
>
> When I open Carla's patchbay I see most of my hardware's source and
> sinks (at least all the one's I care about) However the names for the
> ports are incorrect. I was reading about putting rules in pipewire's
> alsa-monitor.conf file, but so far I have been unable to get that to
> work (based on Carla's patchbay)
>
>
> Has anyone successfully used alsa-monitor.conf rules to change a
> device and its port names?
>
> I used 'pactl list' to get the reported device names and info. Is that
> the right command for pipewire?
>
> Thanks,
>
> Keith
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