Re: [PATCH v9 2/2] img/app: Run PipeWire and WirePlumber in the VMs

[Alyssa Ross <hi@alyssa.is>]

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Demi Marie Obenour <demiobenour@gmail.com> writes:

> WirePlumber is completely overkill as a session manager here, and
> ideally a trivial session manager would be used instead.  PipeWire is
> configured to listen on the PulseAudio socket, so PulseAudio
> compatibility works.  pw-record and pw-play both work, and if PulseAudio
> is installed paplay and parecord also work.  This does install a lot of
> unnecessary files into the VMs, which will hopefully be removed
> later as part of a debloating effort.
>
> Only run-qemu has had a virtio-sound device added, as crosvm and Cloud
> Hypervisor require a virtio-user sound device and that is more complex
> to set up.
>
> Signed-off-by: Demi Marie Obenour <demiobenour@gmail.com>
> ---
> Changes since v8:
> - Add longer explanation for the priority.driver and priority.session
>   values.
> - Give credit to George Kiagiadakis.
> - Fix spelling errors in comments.
>
> Changes since v7:
> - Give the capture node a higher priority.session than the playback
>   node, so WirePlumber links recording applications to the capture node
>   instead of the monitor of the playback node.
> - Give the capture node a higher priority.driver than the playback node,
>   so PipeWire has the capture node drive the graph.  This is better
>   because capture xruns lead to permanently corrupted data, whereas
>   playback xruns do not.
> - Re-enable monitor node creation in WirePlumber.
>
> Changes since v6:
> - Fix spelling errors in commit messages.
> - Sort lines in Makefile.
> - Don't disable support.settings as a comment in wireplumber.conf says
>   to not do that.  Instead, tell WirePlumber to not create monitor
>   nodes.  This is a workaround for WirePlumber bug 829.
> - Don't remove "-cpu host" from make run-qemu's QEMU command line.  This
>   was needed for local testing with KVM disabled but should not have
>   been submitted upstream.  Hardware with KVM support should be used
>   instead.
>
> Changes since v5:
>
> - Use a drop-in configuration file for WirePlumber instead of overriding
>   wireplumber.conf.  This should be more robust to future WirePlumber
>   changes.
> ---
>  img/app/Makefile                              |  16 +-
>  img/app/default.nix                           |   3 +
>  img/app/etc/mdev.conf                         |   1 +
>  img/app/etc/pipewire/pipewire.conf            | 229 ++++++++++++++++++
>  .../etc/s6-rc/app/dependencies.d/wireplumber  |   0
>  .../etc/s6-rc/pipewire/dependencies.d/dbus    |   0
>  img/app/etc/s6-rc/pipewire/notification-fd    |   1 +
>  .../s6-rc/pipewire/notification-fd.license    |   2 +
>  img/app/etc/s6-rc/pipewire/run                |  23 ++
>  img/app/etc/s6-rc/pipewire/type               |   1 +
>  img/app/etc/s6-rc/pipewire/type.license       |   2 +
>  .../etc/s6-rc/wireplumber/dependencies.d/dbus |   0
>  .../s6-rc/wireplumber/dependencies.d/pipewire |   0
>  img/app/etc/s6-rc/wireplumber/run             |   4 +
>  img/app/etc/s6-rc/wireplumber/type            |   1 +
>  img/app/etc/s6-rc/wireplumber/type.license    |   2 +
>  .../wireplumber.conf.d/99_spectrum.conf       |  42 ++++
>  17 files changed, 325 insertions(+), 2 deletions(-)
>  create mode 100644 img/app/etc/pipewire/pipewire.conf
>  create mode 100644 img/app/etc/s6-rc/app/dependencies.d/wireplumber
>  create mode 100644 img/app/etc/s6-rc/pipewire/dependencies.d/dbus
>  create mode 100644 img/app/etc/s6-rc/pipewire/notification-fd
>  create mode 100644 img/app/etc/s6-rc/pipewire/notification-fd.license
>  create mode 100644 img/app/etc/s6-rc/pipewire/run
>  create mode 100644 img/app/etc/s6-rc/pipewire/type
>  create mode 100644 img/app/etc/s6-rc/pipewire/type.license
>  create mode 100644 img/app/etc/s6-rc/wireplumber/dependencies.d/dbus
>  create mode 100644 img/app/etc/s6-rc/wireplumber/dependencies.d/pipewire
>  create mode 100644 img/app/etc/s6-rc/wireplumber/run
>  create mode 100644 img/app/etc/s6-rc/wireplumber/type
>  create mode 100644 img/app/etc/s6-rc/wireplumber/type.license
>  create mode 100644 img/app/etc/wireplumber/wireplumber.conf.d/99_spectrum.conf

We have app depending on wireplumber, but no notification-fd for
wireplumber.  What's actually required here?  Does Wireplumber actually
need to be running (for whatever definition thereof) by the time an
application starts, or does it just need to start at some reasonable
point?

> diff --git a/img/app/Makefile b/img/app/Makefile
> index 4b4d64f81d99a01eebe777f3737fef813ebb6d3f..c2186c9eba52207dfaa94f9ac8364a7dba844c34 100644
> --- a/img/app/Makefile
> +++ b/img/app/Makefile
> @@ -40,6 +40,7 @@ VM_FILES = \
>  	etc/mdev/virtiofs \
>  	etc/mdev/wait \
>  	etc/passwd \
> +	etc/pipewire/pipewire.conf \
>  	etc/resolv.conf \
>  	etc/s6-linux-init/env/DBUS_SESSION_BUS_ADDRESS \
>  	etc/s6-linux-init/env/DISPLAY \
> @@ -47,13 +48,15 @@ VM_FILES = \
>  	etc/s6-linux-init/env/NIX_XDG_DESKTOP_PORTAL_DIR \
>  	etc/s6-linux-init/env/WAYLAND_DISPLAY \
>  	etc/s6-linux-init/env/XDG_RUNTIME_DIR \
> +	etc/s6-linux-init/run-image/service/getty-hvc0/run \
>  	etc/s6-linux-init/run-image/service/s6-linux-init-shutdownd/notification-fd \
>  	etc/s6-linux-init/run-image/service/s6-linux-init-shutdownd/run \
> -	etc/s6-linux-init/run-image/service/getty-hvc0/run \
>  	etc/s6-linux-init/scripts/rc.init \
>  	etc/s6-linux-init/scripts/rc.shutdown \
>  	etc/s6-linux-init/scripts/rc.shutdown.final \
> +	etc/wireplumber/wireplumber.conf.d/99_spectrum.conf \
>  	etc/xdg/xdg-desktop-portal/portals.conf
> +
>  VM_DIRS = dev run proc sys tmp \
>  	etc/s6-linux-init/run-image/service \
>  	etc/s6-linux-init/run-image/user \
> @@ -85,6 +88,7 @@ build/rootfs.erofs: ../../scripts/make-erofs.sh $(PACKAGES_FILE) $(VM_FILES) $(V
>  VM_S6_RC_FILES = \
>  	etc/s6-rc/app/dependencies.d/dbus \
>  	etc/s6-rc/app/dependencies.d/wayland-proxy-virtwl \
> +	etc/s6-rc/app/dependencies.d/wireplumber \
>  	etc/s6-rc/app/run \
>  	etc/s6-rc/app/type \
>  	etc/s6-rc/dbus/notification-fd \
> @@ -98,9 +102,16 @@ VM_S6_RC_FILES = \
>  	etc/s6-rc/mdevd/type \
>  	etc/s6-rc/ok-all/contents \
>  	etc/s6-rc/ok-all/type \
> +	etc/s6-rc/pipewire/notification-fd \
> +	etc/s6-rc/pipewire/run \
> +	etc/s6-rc/pipewire/type \
>  	etc/s6-rc/wayland-proxy-virtwl/notification-fd \
>  	etc/s6-rc/wayland-proxy-virtwl/run \
> -	etc/s6-rc/wayland-proxy-virtwl/type
> +	etc/s6-rc/wayland-proxy-virtwl/type \
> +	etc/s6-rc/wireplumber/dependencies.d/dbus \
> +	etc/s6-rc/wireplumber/dependencies.d/pipewire \
> +	etc/s6-rc/wireplumber/run \
> +	etc/s6-rc/wireplumber/type
>  
>  build/etc/s6-rc: $(VM_S6_RC_FILES)
>  	mkdir -p $$(dirname $@)
> @@ -147,6 +158,7 @@ run-qemu: $(imgdir)/appvm/blk/root.img start-vhost-user-net start-virtiofsd
>  	    -chardev socket,id=virtiofsd,path=build/virtiofsd.sock \
>  	    -device vhost-user-fs-pci,chardev=virtiofsd,tag=virtiofs0 \
>  	    -device virtio-gpu-rutabaga-pci,cross-domain=on,hostmem=8G \
> +	    -audio driver=pipewire,model=virtio \
>  	    -object memory-backend-memfd,id=mem,size=256M,share=on \
>  	    -numa node,memdev=mem \
>  	    -device vhost-vsock-pci,guest-cid=3 \
> diff --git a/img/app/default.nix b/img/app/default.nix
> index 740643ac41f6473cdb6f6b0fd1f5f47f4493240d..d3eed1f0accdc8968d1ba5bdec74ab597789082f 100644
> --- a/img/app/default.nix
> +++ b/img/app/default.nix
> @@ -48,6 +48,9 @@ let
>        pkgs.xwayland
>        pkgs.xdg-desktop-portal
>        pkgs.xdg-desktop-portal-gtk
> +      # Depends on pulseaudio libs
> +      pkgs.pipewire
> +      pkgs.wireplumber
>      ];
>    })).fhsenv;
>  in
> diff --git a/img/app/etc/mdev.conf b/img/app/etc/mdev.conf
> index f2101e1f683c49808358b25520080c59ed2afa8e..0e4a1a088522c05da9e0ce15fe135c40d6cf3064 100644
> --- a/img/app/etc/mdev.conf
> +++ b/img/app/etc/mdev.conf
> @@ -5,3 +5,4 @@
>  $INTERFACE=.* 0:0 660 ! +/etc/mdev/iface
>  $MODALIAS=virtio:d0000001Av.* 0:0 660 ! +/etc/mdev/virtiofs
>  dri/card0 0:0 660 +background { /etc/mdev/listen card0 }
> +snd/controlC0 0:0 660 +background { /etc/mdev/listen controlC0 }
> diff --git a/img/app/etc/pipewire/pipewire.conf b/img/app/etc/pipewire/pipewire.conf
> new file mode 100644
> index 0000000000000000000000000000000000000000..0dceb81ed46d3c264c6b12d9a1141e1b1b2135b7
> --- /dev/null
> +++ b/img/app/etc/pipewire/pipewire.conf
> @@ -0,0 +1,229 @@
> +# SPDX-License-Identifier: MIT
> +
> +# Copyright © 2018 Wim Taymans
> +# Copyright © 2025 Demi Marie Obenour
> +#
> +# Permission is hereby granted, free of charge, to any person obtaining a
> +# copy of this software and associated documentation files (the "Software"),
> +# to deal in the Software without restriction, including without limitation
> +# the rights to use, copy, modify, merge, publish, distribute, sublicense,
> +# and/or sell copies of the Software, and to permit persons to whom the
> +# Software is furnished to do so, subject to the following conditions:
> +#
> +# The above copyright notice and this permission notice (including the next
> +# paragraph) shall be included in all copies or substantial portions of the
> +# Software.
> +#
> +# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> +# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> +# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
> +# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> +# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> +# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
> +# DEALINGS IN THE SOFTWARE.
> +
> +# This file is based on the upstream default configuration.  This can be
> +# found in upstream GitLab or in any distro with a recent version of PipeWire.
> +# The following changes have been made:
> +#
> +# - Conditions that have known values in Spectrum VMs are omitted.
> +# - Modules for hardware devices Spectrum VMs don't have are not loaded.
> +# - The PulseAudio emulation server is loaded.
> +# - Settings for VMs are applied unconditionally.
> +# - Most comments in the upstream files have been removed.
> +# - Device nodes for virtio-sound devices have been added.
> +# - Integration with udev and logind is removed.
> +context.properties = {
> +    # Upstream defaults.
> +    link.max-buffers = 16
> +    core.daemon = true
> +    core.name   = pipewire-0
> +    # Account for running in a VM
> +    default.clock.min-quantum = 1024
> +}
> +
> +# Upstream defaults, with support for AVB, V4L2, libcamera
> +# bluez, Vulkan, JACK, and video conversion omitted.
> +context.spa-libs = {
> +    audio.convert.* = audioconvert/libspa-audioconvert
> +    api.alsa.*      = alsa/libspa-alsa
> +    support.*       = support/libspa-support
> +}
> +
> +context.modules = [
> +    # Upstream defaults
> +    { name = libpipewire-module-rt
> +        args = { nice.level = -11, rt.prio = 88 }
> +    }
> +    { name = libpipewire-module-protocol-native  }
> +    { name = libpipewire-module-metadata }
> +    { name = libpipewire-module-spa-device-factory }
> +    { name = libpipewire-module-spa-node-factory }
> +    { name = libpipewire-module-client-node }
> +    { name = libpipewire-module-access }
> +    { name = libpipewire-module-client-device }
> +    { name = libpipewire-module-portal }
> +    { name = libpipewire-module-adapter }
> +    { name = libpipewire-module-link-factory }
> +    { name = libpipewire-module-session-manager }
> +
> +    # Load the PulseAudio server into PipeWire.
> +    # This avoids needing a separate pipewire-pulse
> +    # process.  The args are those used when running
> +    # in a VM.
> +    { name = libpipewire-module-protocol-pulse
> +        args = {
> +            server.address = [ "unix:native" ]
> +            pulse.min.quantum = 1024/48000
> +        }
> +    }
> +]
> +
> +context.objects = [
> +    # Upstream defaults
> +    { factory = spa-node-factory
> +        args = {
> +            factory.name    = support.node.driver
> +            node.name       = Dummy-Driver
> +            node.group      = pipewire.dummy
> +            node.sync-group = sync.dummy
> +            priority.driver = 200000
> +        }
> +    }
> +    { factory = spa-node-factory
> +        args = {
> +            factory.name    = support.node.driver
> +            node.name       = Freewheel-Driver
> +            priority.driver = 190000
> +            node.group      = pipewire.freewheel
> +            node.sync-group = sync.dummy
> +            node.freewheel  = true
> +        }
> +    }
> +
> +    # Spectrum doesn't use udev, so device nodes must be created statically.
> +    # Creating them with pw-cli works as long as pw-cli is running, but
> +    # the nodes are destroyed when pw-cli exits.
> +    #
> +    # PipeWire chooses the node with the highest priority.driver value as
> +    # graph driver, which is the node that decides when the processing graph
> +    # is going to run.  If both the capture node and playback node are in
> +    # the same graph, the capture node should be chosen as the driver.  This
> +    # is because the driver gets to choose the rate of the graph and so is
> +    # much less likely to xrun.  Since capture xruns result in corrupted
> +    # audio recordings, while playback xruns just result in a glitch, it
> +    # is more important to avoid capture xruns.
> +    #
> +    # When there are multiple sources or sinks that could be used,
> +    # WirePlumber links application nodes to the one with the highest
> +    # priority.session value.  In the configuration created here,
> +    # there are two valid audio sources: the virtio sound card's
> +    # capture stream and the monitor of its playback stream.  The
> +    # capture stream is the correct choice, so its priority.session
> +    # should be higher.
> +    #
> +    # The recommendation to give the capture device higher values
> +    # for priority.driver and priority.session comes from George
> +    # Kiagiadakis of Collabora, who also provided the values
> +    # used (2000 and 1000) and why they must be different.
> +    # The explanation for why it is more important to avoid
> +    # capture xruns than playback xruns comes from past discussions
> +    # that I (Demi Marie Obenour) had with Wim Taymans.

Just checking: they're okay with being credited, right?  (Important for
me to be confident before mentioning anybody in an immutable log.)

> +    { factory = adapter
> +        args = {
> +            alsa.card              = 0,
> +            alsa.card_name         = "VirtIO SoundCard"
> +            alsa.device            = 0
> +            alsa.driver_name       = "virtio_snd"
> +            alsa.id                = "SoundCard"
> +            alsa.long_card_name    = "VirtIO SoundCard at pci/0000:00:01.0/virtio0"
> +            alsa.name              = "VirtIO SoundCard"
> +            alsa.subdevice         = 0
> +            alsa.subdevice_name    = "subdevice #0"
> +            api.alsa.card.longname = "VirtIO SoundCard at pci/0000:00:01.0/virtio0"
> +            api.alsa.card.name     = "VirtIO SoundCard"
> +            api.alsa.headroom      = 0
> +            api.alsa.path          = "hw:0,0,0"
> +            api.alsa.pcm.card      = 0,
> +            api.alsa.pcm.stream    = "playback"
> +            audio.allowed-rates    = [ ]
> +            audio.channels         = 2
> +            audio.format           = "S32"
> +            audio.position         = "FL,FR"
> +            audio.rate             = 48000
> +            factory.name           = "api.alsa.pcm.sink"
> +            media.class            = "Audio/Sink"
> +            node.name              = "alsa_output.pci-0000_00_01.0.analog-stereo"
> +            node.suspend-on-idle   = true
> +            priority.driver        = 1000
> +            priority.session       = 1000
> +        }
> +    }
> +
> +    { factory = adapter
> +        args = {
> +            alsa.card              = 0,
> +            alsa.card_name         = "VirtIO SoundCard"
> +            alsa.device            = 0
> +            alsa.driver_name       = "virtio_snd"
> +            alsa.id                = "SoundCard"
> +            alsa.long_card_name    = "VirtIO SoundCard at pci/0000:00:01.0/virtio0"
> +            alsa.name              = "VirtIO SoundCard"
> +            alsa.subdevice         = 0
> +            alsa.subdevice_name    = "subdevice #0"
> +            api.alsa.card.longname = "VirtIO SoundCard at pci/0000:00:01.0/virtio0"
> +            api.alsa.card.name     = "VirtIO SoundCard"
> +            api.alsa.headroom      = 0
> +            api.alsa.path          = "hw:0,0,0"
> +            api.alsa.pcm.card      = 0,
> +            api.alsa.pcm.stream    = "capture"
> +            audio.allowed-rates    = [ ]
> +            audio.channels         = 2
> +            audio.format           = "S32"
> +            audio.position         = "FL,FR"
> +            audio.rate             = 48000
> +            factory.name           = "api.alsa.pcm.source"
> +            media.class            = "Audio/Source"
> +            node.name              = "alsa_input.pci-0000_00_01.0.analog-stereo"
> +            node.suspend-on-idle   = true
> +            priority.driver        = 2000
> +            priority.session       = 2000
> +        }
> +    }
> +]
> +
> +# Load the modules that are in the default config *except*
> +# for ones whose job is to maintain state.
> +pulse.cmd = [
> +    { cmd = "load-module" args = "module-always-sink" flags = [ ] }
> +    { cmd = "load-module" args = "module-device-manager" flags = [ ] }
> +]
> +
> +# More default stuff.
> +pulse.rules = [
> +    {
> +        matches = [
> +             { application.process.binary = "teams" }
> +             { application.process.binary = "teams-insiders" }
> +             { application.process.binary = "teams-for-linux" }
> +             { application.process.binary = "skypeforlinux" }
> +        ]
> +        actions = { quirks = [ force-s16-info ] }
> +    }
> +    {
> +        matches = [ { application.process.binary = "firefox" } ]
> +        actions = { quirks = [ remove-capture-dont-move ] }
> +    }
> +    {
> +        matches = [ { application.name = "~speech-dispatcher.*" } ]
> +        actions = {
> +            update-props = {
> +                pulse.min.req          = 512/48000
> +                pulse.min.quantum      = 512/48000
> +                pulse.idle.timeout     = 5
> +            }
> +        }
> +    }
> +]
> +
> +context.exec = []
> diff --git a/img/app/etc/s6-rc/app/dependencies.d/wireplumber b/img/app/etc/s6-rc/app/dependencies.d/wireplumber
> new file mode 100644
> index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
> diff --git a/img/app/etc/s6-rc/pipewire/dependencies.d/dbus b/img/app/etc/s6-rc/pipewire/dependencies.d/dbus
> new file mode 100644
> index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
> diff --git a/img/app/etc/s6-rc/pipewire/notification-fd b/img/app/etc/s6-rc/pipewire/notification-fd
> new file mode 100644
> index 0000000000000000000000000000000000000000..7ed6ff82de6bcc2a78243fc9c54d3ef5ac14da69
> --- /dev/null
> +++ b/img/app/etc/s6-rc/pipewire/notification-fd
> @@ -0,0 +1 @@
> +5
> diff --git a/img/app/etc/s6-rc/pipewire/notification-fd.license b/img/app/etc/s6-rc/pipewire/notification-fd.license
> new file mode 100644
> index 0000000000000000000000000000000000000000..c4a0586a407fe14c3e0855749a7524ac3871dda4
> --- /dev/null
> +++ b/img/app/etc/s6-rc/pipewire/notification-fd.license
> @@ -0,0 +1,2 @@
> +SPDX-License-Identifier: CC0-1.0
> +SPDX-FileCopyrightText: 2025 Demi Marie Obenour <demiobenour@gmail.com>
> diff --git a/img/app/etc/s6-rc/pipewire/run b/img/app/etc/s6-rc/pipewire/run
> new file mode 100644
> index 0000000000000000000000000000000000000000..c5cf090fb4779e0f3ede1782ada5c95ce5b25702
> --- /dev/null
> +++ b/img/app/etc/s6-rc/pipewire/run
> @@ -0,0 +1,23 @@
> +#!/bin/execlineb -P
> +# SPDX-License-Identifier: EUPL-1.2+
> +# SPDX-FileCopyrightText: 2023-2024 Alyssa Ross <hi@alyssa.is>
> +# SPDX-FileCopyrightText: 2025 Demi Marie Obenour <demiobenour@gmail.com>
> +
> +s6-ipcserver-socketbinder -B /run/user/0/pipewire-0
> +fdmove -c 3 0
> +
> +s6-ipcserver-socketbinder -B /run/user/0/pipewire-0-manager
> +fdmove -c 4 0
> +
> +redirfd -r 0 /dev/null
> +
> +# Wait for sound devices to be available
> +if { /etc/mdev/wait controlC0 }
> +
> +# Notify readiness.
> +if { fdmove 1 5 echo }
> +fdclose 5

We could move this earlier, right?  If things connect before the sound
devices are available, PipeWire won't have been started yet so the
connection will just not be accepted until they are.

> +
> +export LISTEN_FDS 2
> +getpid LISTEN_PID
> +pipewire
> diff --git a/img/app/etc/s6-rc/pipewire/type b/img/app/etc/s6-rc/pipewire/type
> new file mode 100644
> index 0000000000000000000000000000000000000000..5883cff0cd1514b2836f4ffa39fdac769a5213cb
> --- /dev/null
> +++ b/img/app/etc/s6-rc/pipewire/type
> @@ -0,0 +1 @@
> +longrun
> diff --git a/img/app/etc/s6-rc/pipewire/type.license b/img/app/etc/s6-rc/pipewire/type.license
> new file mode 100644
> index 0000000000000000000000000000000000000000..c4a0586a407fe14c3e0855749a7524ac3871dda4
> --- /dev/null
> +++ b/img/app/etc/s6-rc/pipewire/type.license
> @@ -0,0 +1,2 @@
> +SPDX-License-Identifier: CC0-1.0
> +SPDX-FileCopyrightText: 2025 Demi Marie Obenour <demiobenour@gmail.com>
> diff --git a/img/app/etc/s6-rc/wireplumber/dependencies.d/dbus b/img/app/etc/s6-rc/wireplumber/dependencies.d/dbus
> new file mode 100644
> index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
> diff --git a/img/app/etc/s6-rc/wireplumber/dependencies.d/pipewire b/img/app/etc/s6-rc/wireplumber/dependencies.d/pipewire
> new file mode 100644
> index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
> diff --git a/img/app/etc/s6-rc/wireplumber/run b/img/app/etc/s6-rc/wireplumber/run
> new file mode 100644
> index 0000000000000000000000000000000000000000..d58f1971c7387c896256a91ad0c92386a02fd9e2
> --- /dev/null
> +++ b/img/app/etc/s6-rc/wireplumber/run
> @@ -0,0 +1,4 @@
> +#!/bin/execlineb -P
> +# SPDX-License-Identifier: EUPL-1.2+
> +# SPDX-FileCopyrightText: 2025 Demi Marie Obenour <demiobenour@gmail.com>
> +wireplumber --profile spectrum
> diff --git a/img/app/etc/s6-rc/wireplumber/type b/img/app/etc/s6-rc/wireplumber/type
> new file mode 100644
> index 0000000000000000000000000000000000000000..5883cff0cd1514b2836f4ffa39fdac769a5213cb
> --- /dev/null
> +++ b/img/app/etc/s6-rc/wireplumber/type
> @@ -0,0 +1 @@
> +longrun
> diff --git a/img/app/etc/s6-rc/wireplumber/type.license b/img/app/etc/s6-rc/wireplumber/type.license
> new file mode 100644
> index 0000000000000000000000000000000000000000..c4a0586a407fe14c3e0855749a7524ac3871dda4
> --- /dev/null
> +++ b/img/app/etc/s6-rc/wireplumber/type.license
> @@ -0,0 +1,2 @@
> +SPDX-License-Identifier: CC0-1.0
> +SPDX-FileCopyrightText: 2025 Demi Marie Obenour <demiobenour@gmail.com>
> diff --git a/img/app/etc/wireplumber/wireplumber.conf.d/99_spectrum.conf b/img/app/etc/wireplumber/wireplumber.conf.d/99_spectrum.conf
> new file mode 100644
> index 0000000000000000000000000000000000000000..277e6019c46582afba12af9b1a27bb16ddd9e804
> --- /dev/null
> +++ b/img/app/etc/wireplumber/wireplumber.conf.d/99_spectrum.conf
> @@ -0,0 +1,42 @@
> +# SPDX-License-Identifier: MIT
> +# SPDX-FileCopyrightText: 2019-2021 Collabora Ltd.
> +# SPDX-FileCopyrightText: 2025 Demi Marie Obenour
> +
> +# Copyright © 2019-2021 Collabora Ltd.

Once again I'm surprised any of this is © Collabora…

> +#
> +# Permission is hereby granted, free of charge, to any person obtaining a
> +# copy of this software and associated documentation files (the "Software"),
> +# to deal in the Software without restriction, including without limitation
> +# the rights to use, copy, modify, merge, publish, distribute, sublicense,
> +# and/or sell copies of the Software, and to permit persons to whom the
> +# Software is furnished to do so, subject to the following conditions:
> +#
> +# The above copyright notice and this permission notice (including the next
> +# paragraph) shall be included in all copies or substantial portions of the
> +# Software.
> +#
> +# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> +# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> +# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
> +# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> +# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> +# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
> +# DEALINGS IN THE SOFTWARE.
> +
> +wireplumber.profiles = {
> +  spectrum = {
> +    # Spectrum VMs are essentially embedded systems, in that they are
> +    # not at all general-purpose.
> +    inherits = [ main-embedded ]
> +    # Disable video and Bluetooth
> +    hardware.video-capture = disabled
> +    hardware.bluetooth = disabled
> +    # Media Session is definitely not running
> +    check.no-media-session = disabled
> +  }
> +}
> +
> +wireplumber.settings = {
> +  # Default to 100% sink volume.  The host will adjust this as needed.
> +  device.routes.default-sink-volume = 1.0
> +}

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