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| | # 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.
# See <https://gitlab.freedesktop.org/pipewire/wireplumber/-/issues/829#note_3027666>.
# 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.
{ 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 = []
|