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Tue, 29 Jul 2025 14:17:29 -0700 (PDT) Message-ID: Date: Tue, 29 Jul 2025 17:17:22 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Demi Marie Obenour To: Alyssa Ross , Spectrum OS Development References: <20250728231303.2416-1-demiobenour@gmail.com> <1139f3559979e28a38e99a0e9486d79dabb3d8a3.1753748336.git.demiobenour@gmail.com> <875xfbdu13.fsf@alyssa.is> Content-Language: en-US In-Reply-To: <875xfbdu13.fsf@alyssa.is> Autocrypt: addr=demiobenour@gmail.com; keydata= xsFNBFp+A0oBEADffj6anl9/BHhUSxGTICeVl2tob7hPDdhHNgPR4C8xlYt5q49yB+l2nipd aq+4Gk6FZfqC825TKl7eRpUjMriwle4r3R0ydSIGcy4M6eb0IcxmuPYfbWpr/si88QKgyGSV Z7GeNW1UnzTdhYHuFlk8dBSmB1fzhEYEk0RcJqg4AKoq6/3/UorR+FaSuVwT7rqzGrTlscnT DlPWgRzrQ3jssesI7sZLm82E3pJSgaUoCdCOlL7MMPCJwI8JpPlBedRpe9tfVyfu3euTPLPx wcV3L/cfWPGSL4PofBtB8NUU6QwYiQ9Hzx4xOyn67zW73/G0Q2vPPRst8LBDqlxLjbtx/WLR 6h3nBc3eyuZ+q62HS1pJ5EvUT1vjyJ1ySrqtUXWQ4XlZyoEFUfpJxJoN0A9HCxmHGVckzTRl 5FMWo8TCniHynNXsBtDQbabt7aNEOaAJdE7to0AH3T/Bvwzcp0ZJtBk0EM6YeMLtotUut7h2 Bkg1b//r6bTBswMBXVJ5H44Qf0+eKeUg7whSC9qpYOzzrm7+0r9F5u3qF8ZTx55TJc2g656C 9a1P1MYVysLvkLvS4H+crmxA/i08Tc1h+x9RRvqba4lSzZ6/Tmt60DPM5Sc4R0nSm9BBff0N m0bSNRS8InXdO1Aq3362QKX2NOwcL5YaStwODNyZUqF7izjK4QARAQABzTxEZW1pIE1hcmll IE9iZW5vdXIgKGxvdmVyIG9mIGNvZGluZykgPGRlbWlvYmVub3VyQGdtYWlsLmNvbT7CwXgE EwECACIFAlp+A0oCGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJELKItV//nCLBhr8Q AK/xrb4wyi71xII2hkFBpT59ObLN+32FQT7R3lbZRjVFjc6yMUjOb1H/hJVxx+yo5gsSj5LS 9AwggioUSrcUKldfA/PKKai2mzTlUDxTcF3vKx6iMXKA6AqwAw4B57ZEJoMM6egm57TV19kz PMc879NV2nc6+elaKl+/kbVeD3qvBuEwsTe2Do3HAAdrfUG/j9erwIk6gha/Hp9yZlCnPTX+ VK+xifQqt8RtMqS5R/S8z0msJMI/ajNU03kFjOpqrYziv6OZLJ5cuKb3bZU5aoaRQRDzkFIR 6aqtFLTohTo20QywXwRa39uFaOT/0YMpNyel0kdOszFOykTEGI2u+kja35g9TkH90kkBTG+a EWttIht0Hy6YFmwjcAxisSakBuHnHuMSOiyRQLu43ej2+mDWgItLZ48Mu0C3IG1seeQDjEYP tqvyZ6bGkf2Vj+L6wLoLLIhRZxQOedqArIk/Sb2SzQYuxN44IDRt+3ZcDqsPppoKcxSyd1Ny 2tpvjYJXlfKmOYLhTWs8nwlAlSHX/c/jz/ywwf7eSvGknToo1Y0VpRtoxMaKW1nvH0OeCSVJ itfRP7YbiRVc2aNqWPCSgtqHAuVraBRbAFLKh9d2rKFB3BmynTUpc1BQLJP8+D5oNyb8Ts4x Xd3iV/uD8JLGJfYZIR7oGWFLP4uZ3tkneDfYzsFNBFp+A0oBEAC9ynZI9LU+uJkMeEJeJyQ/ 8VFkCJQPQZEsIGzOTlPnwvVna0AS86n2Z+rK7R/usYs5iJCZ55/JISWd8xD57ue0eB47bcJv VqGlObI2DEG8TwaW0O0duRhDgzMEL4t1KdRAepIESBEA/iPpI4gfUbVEIEQuqdqQyO4GAe+M kD0Hy5JH/0qgFmbaSegNTdQg5iqYjRZ3ttiswalql1/iSyv1WYeC1OAs+2BLOAT2NEggSiVO txEfgewsQtCWi8H1SoirakIfo45Hz0tk/Ad9ZWh2PvOGt97Ka85o4TLJxgJJqGEnqcFUZnJJ riwoaRIS8N2C8/nEM53jb1sH0gYddMU3QxY7dYNLIUrRKQeNkF30dK7V6JRH7pleRlf+wQcN fRAIUrNlatj9TxwivQrKnC9aIFFHEy/0mAgtrQShcMRmMgVlRoOA5B8RTulRLCmkafvwuhs6 dCxN0GNAORIVVFxjx9Vn7OqYPgwiofZ6SbEl0hgPyWBQvE85klFLZLoj7p+joDY1XNQztmfA rnJ9x+YV4igjWImINAZSlmEcYtd+xy3Li/8oeYDAqrsnrOjb+WvGhCykJk4urBog2LNtcyCj kTs7F+WeXGUo0NDhbd3Z6AyFfqeF7uJ3D5hlpX2nI9no/ugPrrTVoVZAgrrnNz0iZG2DVx46 x913pVKHl5mlYQARAQABwsFfBBgBAgAJBQJafgNKAhsMAAoJELKItV//nCLBwNIP/AiIHE8b oIqReFQyaMzxq6lE4YZCZNj65B/nkDOvodSiwfwjjVVE2V3iEzxMHbgyTCGA67+Bo/d5aQGj gn0TPtsGzelyQHipaUzEyrsceUGWYoKXYyVWKEfyh0cDfnd9diAm3VeNqchtcMpoehETH8fr RHnJdBcjf112PzQSdKC6kqU0Q196c4Vp5HDOQfNiDnTf7gZSj0BraHOByy9LEDCLhQiCmr+2 E0rW4tBtDAn2HkT9uf32ZGqJCn1O+2uVfFhGu6vPE5qkqrbSE8TG+03H8ecU2q50zgHWPdHM OBvy3EhzfAh2VmOSTcRK+tSUe/u3wdLRDPwv/DTzGI36Kgky9MsDC5gpIwNbOJP2G/q1wT1o Gkw4IXfWv2ufWiXqJ+k7HEi2N1sree7Dy9KBCqb+ca1vFhYPDJfhP75I/VnzHVssZ/rYZ9+5 1yDoUABoNdJNSGUYl+Yh9Pw9pE3Kt4EFzUlFZWbE4xKL/NPno+z4J9aWemLLszcYz/u3XnbO vUSQHSrmfOzX3cV4yfmjM5lewgSstoxGyTx2M8enslgdXhPthZlDnTnOT+C+OTsh8+m5tos8 HQjaPM01MKBiAqdPgksm1wu2DrrwUi6ChRVTUBcj6+/9IJ81H2P2gJk3Ls3AVIxIffLoY34E +MYSfkEjBz0E8CLOcAw7JIwAaeBT Subject: Re: [PATCH v9 2/2] img/app: Run PipeWire and WirePlumber in the VMs Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------RDja99o1BARKLF7w0Ri3R073" Message-ID-Hash: 46LFGLEKVYZ4I5QZF7IUTL4TJH7PLEWW X-Message-ID-Hash: 46LFGLEKVYZ4I5QZF7IUTL4TJH7PLEWW X-MailFrom: demiobenour@gmail.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-devel.spectrum-os.org-0; header-match-devel.spectrum-os.org-1; header-match-devel.spectrum-os.org-2; header-match-devel.spectrum-os.org-3; header-match-devel.spectrum-os.org-4; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.9 Precedence: list List-Id: Patches and low-level development discussion Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------RDja99o1BARKLF7w0Ri3R073 Content-Type: multipart/mixed; boundary="------------TeiVcrOTxDGq3FZEldGI0bcT"; protected-headers="v1" From: Demi Marie Obenour To: Alyssa Ross , Spectrum OS Development Message-ID: Subject: Re: [PATCH v9 2/2] img/app: Run PipeWire and WirePlumber in the VMs References: <20250728231303.2416-1-demiobenour@gmail.com> <1139f3559979e28a38e99a0e9486d79dabb3d8a3.1753748336.git.demiobenour@gmail.com> <875xfbdu13.fsf@alyssa.is> In-Reply-To: <875xfbdu13.fsf@alyssa.is> --------------TeiVcrOTxDGq3FZEldGI0bcT Content-Type: multipart/mixed; boundary="------------Qb34zTA0b2YlcraaXTsyj4hZ" --------------Qb34zTA0b2YlcraaXTsyj4hZ Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 7/29/25 09:08, Alyssa Ross wrote: > Demi Marie Obenour writes: >=20 >> 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 PulseAud= io >> is installed paplay and parecord also work. This does install a lot o= f >> 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 >> --- >> 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 nod= e >> instead of the monitor of the playback node. >> - Give the capture node a higher priority.driver than the playback nod= e, >> 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. Th= is >> 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 overridi= ng >> 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/pipew= ire >> 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_spec= trum.conf >=20 > 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? The latter. In systemd terms, this is WantedBy=3D. I will fix this by having ok-all depend on WirePlumber, while the app no longer does. >> + # PipeWire chooses the node with the highest priority.driver valu= e as >> + # graph driver, which is the node that decides when the processin= g graph >> + # is going to run. If both the capture node and playback node ar= e in >> + # the same graph, the capture node should be chosen as the driver= =2E 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 corrup= ted >> + # 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. >=20 > Just checking: they're okay with being credited, right? (Important for= > me to be confident before mentioning anybody in an immutable log.) That's actually not something I had checked. I asked both if they are okay with this. Should I sent V10 without these, or should I wait for a response from them? >> diff --git a/img/app/etc/s6-rc/app/dependencies.d/wireplumber b/img/ap= p/etc/s6-rc/app/dependencies.d/wireplumber >> new file mode 100644 >> index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29= ae775ad8c2e48c5391 >> diff --git a/img/app/etc/s6-rc/pipewire/dependencies.d/dbus b/img/app/= etc/s6-rc/pipewire/dependencies.d/dbus This dependency wasn't needed and wasn't included in the VMs. v10 will leave it out. >> --- /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 >> +# SPDX-FileCopyrightText: 2025 Demi Marie Obenour >> + >> +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 >=20 > 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. That is indeed correct. Will change in v10. >> diff --git a/img/app/etc/wireplumber/wireplumber.conf.d/99_spectrum.co= nf b/img/app/etc/wireplumber/wireplumber.conf.d/99_spectrum.conf >> new file mode 100644 >> index 0000000000000000000000000000000000000000..277e6019c46582afba12af= 9b1a27bb16ddd9e804 >> --- /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 =C2=A9 2019-2021 Collabora Ltd. >=20 > Once again I'm surprised any of this is =C2=A9 Collabora=E2=80=A6 It's out of an abundance of caution. All of this is taken from the wireplumber.conf files in Arch and Nixpkgs, which I believe are just the upstream ones. I suspect you are correct, but it's much better to keep a copyright notice that is not needed than to remove one that actually *is* needed. >> +# >> +# Permission is hereby granted, free of charge, to any person obtaini= ng a >> +# copy of this software and associated documentation files (the "Soft= ware"), >> +# to deal in the Software without restriction, including without limi= tation >> +# the rights to use, copy, modify, merge, publish, distribute, sublic= ense, >> +# and/or sell copies of the Software, and to permit persons to whom t= he >> +# Software is furnished to do so, subject to the following conditions= : >> +# >> +# The above copyright notice and this permission notice (including th= e 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, EXP= RESS OR >> +# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABI= LITY, >> +# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT = SHALL >> +# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES O= R OTHER >> +# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARI= SING >> +# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER= >> +# DEALINGS IN THE SOFTWARE. >> + >> +wireplumber.profiles =3D { >> + spectrum =3D { >> + # Spectrum VMs are essentially embedded systems, in that they are= >> + # not at all general-purpose. >> + inherits =3D [ main-embedded ] >> + # Disable video and Bluetooth >> + hardware.video-capture =3D disabled >> + hardware.bluetooth =3D disabled >> + # Media Session is definitely not running >> + check.no-media-session =3D disabled >> + } >> +} >> + >> +wireplumber.settings =3D { >> + # Default to 100% sink volume. The host will adjust this as needed= =2E >> + device.routes.default-sink-volume =3D 1.0 >> +} --=20 Sincerely, Demi Marie Obenour (she/her/hers) --------------Qb34zTA0b2YlcraaXTsyj4hZ Content-Type: application/pgp-keys; name="OpenPGP_0xB288B55FFF9C22C1.asc" Content-Disposition: attachment; filename="OpenPGP_0xB288B55FFF9C22C1.asc" Content-Description: OpenPGP public key Content-Transfer-Encoding: quoted-printable -----BEGIN PGP PUBLIC KEY BLOCK----- xsFNBFp+A0oBEADffj6anl9/BHhUSxGTICeVl2tob7hPDdhHNgPR4C8xlYt5q49y B+l2nipdaq+4Gk6FZfqC825TKl7eRpUjMriwle4r3R0ydSIGcy4M6eb0IcxmuPYf bWpr/si88QKgyGSVZ7GeNW1UnzTdhYHuFlk8dBSmB1fzhEYEk0RcJqg4AKoq6/3/ UorR+FaSuVwT7rqzGrTlscnTDlPWgRzrQ3jssesI7sZLm82E3pJSgaUoCdCOlL7M MPCJwI8JpPlBedRpe9tfVyfu3euTPLPxwcV3L/cfWPGSL4PofBtB8NUU6QwYiQ9H zx4xOyn67zW73/G0Q2vPPRst8LBDqlxLjbtx/WLR6h3nBc3eyuZ+q62HS1pJ5EvU T1vjyJ1ySrqtUXWQ4XlZyoEFUfpJxJoN0A9HCxmHGVckzTRl5FMWo8TCniHynNXs BtDQbabt7aNEOaAJdE7to0AH3T/Bvwzcp0ZJtBk0EM6YeMLtotUut7h2Bkg1b//r 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