[PATCH v7 2/2] img/app: Run PipeWire and WirePlumber in the VMs

[Demi Marie Obenour <demiobenour@gmail.com>]

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.

If WirePlumber is allowed to enable monitor nodes for the ALSA output
device, WirePlumber prefers the monitor over the ALSA input device [1].
This breaks audio recording.  To work around this, set
node.features.audio.monitor-ports to false.

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.

[1]: https://gitlab.freedesktop.org/pipewire/wireplumber/-/issues/829

Signed-off-by: Demi Marie Obenour <demiobenour@gmail.com>
---
Changes since v6:

- Fix spelling errors in commit message.
- 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.

The copyright notice on the WirePlumber drop-in was kept because it is
based on fragments in the upstream config file and because when in doubt,
keeping the copyright notice is always safer.

Changes since v5:

- Remove "directories" service in favor of creating the directories from
  rc.init.
- 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            | 199 ++++++++++++++++++
 .../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       |  45 ++++
 17 files changed, 298 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

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..e5a413a409f46e7fe176102bbd6780db14f85dba
--- /dev/null
+++ b/img/app/etc/pipewire/pipewire.conf
@@ -0,0 +1,199 @@
+# 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.
+    { 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
+        }
+    }
+    { 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
+        }
+    }
+]
+
+# 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
+
+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..75672bc4e2acc90dfc481905e6ce71615977dc0d
--- /dev/null
+++ b/img/app/etc/wireplumber/wireplumber.conf.d/99_spectrum.conf
@@ -0,0 +1,45 @@
+# SPDX-License-Identifier: MIT
+# SPDX-FileCopyrightText: 2019-2021 Collabora Ltd.
+# SPDX-FileCopyrightText: 2025 Demi Marie Obenour
+
+# Copyright © 2019-2021 Collabora Ltd.
+#
+# 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
+  # Disable monitor ports so WirePlumber cannot select them:
+  # https://gitlab.freedesktop.org/pipewire/wireplumber/-/issues/829
+  node.features.audio.monitor-ports = false
+}
-- 
Sincerely,
Demi Marie Obenour (she/her/hers)