Please backport v4l2loopback 0.12.5-1 (universe) from hirsute

Bug #1905613 reported by Liz Fong-Jones
12
This bug affects 2 people
Affects Status Importance Assigned to Milestone
HWE Next
High
Unassigned
v4l2loopback (Ubuntu)
Wishlist
Unassigned
Focal
Wishlist
You-Sheng Yang
Groovy
Wishlist
Unassigned

Bug Description

[SRU Justification]

[Impact]

On a MIPI camera through Intel IPU6 platform that its raw V4L2 loopback interface is preserved for Intel Camera HAL libraries, a relay daemon + v4l2loopback is used to allow the usage of legacy V4L2 based apps.

By design, the relayd will open v4l2sink to v4l2loopback OUTPUT deivce, and it will only open libcamhal based GStreamer source element, and therefore underlying camera hardware, until received new client notifications via V4L2 Event API that is introduced in this SRU.

Besides, frame sizes/intervals enumeration is also fixed to meet better compliance with user apps.

[Test Plan]

v4l2loopback doesn't support V4L2 Event API until recently, so requests for the usage will always fail:

  struct v4l2_event_subscription sub;
  int fd;

  memset (&sub, 0, sizeof (sub));
  sub.type = ...;
  if (ioctl (fd, VIDIOC_SUBSCRIBE_EVENT, &sub) == 0) // fail

With this fix, it shall support Event API operations, e.g. VIDIOC_SUBSCRIBE_EVENT, VIDIOC_UNSUBSCRIBE_EVENT, VIDIOC_DQEVENT.

[Where problems could occur]

While a custom type of V4L2 event is now registered for OEM projects, software expected same ID (numerically equivalent to V4L2_EVENT_PRIVATE_START) may get confused. While this falls in the private usage section, it's not supposed to be used in general, and when it does, it should be under some presumptions, e.g. selected hardware, so it's unlikely to happen on OEM projects.

For generic Ubuntu, programs may begin to take advantage of this new capability to update its UI, or to take other actions after receiving desired events. There might be behavior changes, but should be under the original design if was done carefully.

[Other Info]

For Focal backports, 0.12.5-1 is equivalent to 0.12.3-1ubuntu0.3 plus micro version updates, so there should be little risk backport a new release, and we can drop additional patches carried. This implies bug 1905613.

========= original bug report ==========

Please backport v4l2loopback 0.12.5-1 (universe) from hirsute to focal, groovy.

Reason for the backport:
========================
Makes dkms module compatible with 5.8 kernels eg linux-generic-hwe-20.04-edge

Testing:
========
Mark off items in the checklist [X] as you test them, but please leave the checklist so that backporters can quickly evaluate the state of testing.

You can test-build the backport in your PPA with backportpackage:
$ backportpackage -u ppa:<lp username>/<ppa name> -s hirsute -d focal v4l2loopback
$ backportpackage -u ppa:<lp username>/<ppa name> -s hirsute -d groovy v4l2loopback

* focal:
[x] Package builds without modification
[x] v4l2loopback-source installs cleanly and runs
[x] v4l2loopback-dkms installs cleanly and runs
[x] v4l2loopback-utils installs cleanly and runs
* groovy:
[x] Package builds without modification
[x] v4l2loopback-source installs cleanly and runs
[x] v4l2loopback-dkms installs cleanly and runs
[x] v4l2loopback-utils installs cleanly and runs

Reverse dependencies:
=====================
The following reverse-dependencies need to be tested against the new version of v4l2loopback. For reverse-build-dependencies (-Indep), please test that the package still builds against the new v4l2loopback. For reverse-dependencies, please test that the version of the package currently in the release still works with the new v4l2loopback installed. Reverse- Recommends, Suggests, and Enhances don't need to be tested, and are listed for completeness-sake.

v4l2loopback-source
-------------------

v4l2loopback-dkms
-----------------
* gem-plugin-v4l2
  [ ] focal (Reverse-Suggests)
  [ ] groovy (Reverse-Suggests)
* xpra
  [ ] focal (Reverse-Suggests)
  [ ] groovy (Reverse-Suggests)

v4l2loopback-utils
------------------

Revision history for this message
Erich Eickmeyer  (eeickmeyer) wrote :

Added as bug to the package to get actual attention.

Revision history for this message
Thomas Ward (teward) wrote :

You need to verify the rdepends as well. This will not move until this gets the rdeps tested.

Revision history for this message
Erich Eickmeyer  (eeickmeyer) wrote :

Please test the reverse dependencies, otherwise this package will remain unbackported.

Revision history for this message
Thomas Ward (teward) wrote :

I misread - Reverse-Suggests don't need tested, they're listed for completeness sake.

Revision history for this message
Erich Eickmeyer  (eeickmeyer) wrote :

Please attach build logs or build this in a PPA and link to that PPA to help with the backporting process.

Revision history for this message
Erich Eickmeyer  (eeickmeyer) wrote :

Disregard Comment #5. I went ahead and did it. https://launchpad.net/~eeickmeyer/+archive/ubuntu/ppa/+build/20390685

Revision history for this message
You-Sheng Yang (vicamo) wrote :

I'm trying to submit new changes for bug 1921474, which is based on 0.12.5-1, and backporting it to Focal.

Changed in v4l2loopback (Ubuntu Focal):
status: New → In Progress
importance: Undecided → Medium
importance: Medium → High
assignee: nobody → You-Sheng Yang (vicamo)
Changed in v4l2loopback (Ubuntu Groovy):
status: New → Won't Fix
You-Sheng Yang (vicamo)
description: updated
Revision history for this message
Timo Aaltonen (tjaalton) wrote : Proposed package upload rejected

An upload of v4l2loopback to focal-proposed has been rejected from the upload queue for the following reason: "The version is wrong, newer than what's in hirsute, and don't drop debian/changelog entries when backporting".

Mathew Hodson (mhodson)
Changed in v4l2loopback (Ubuntu):
status: New → Fix Released
affects: groovy-backports → ubuntu-translations
Changed in ubuntu-translations:
importance: Undecided → High
affects: ubuntu-translations → hwe-next
affects: focal-backports → ubuntu-translations
no longer affects: ubuntu-translations
Changed in v4l2loopback (Ubuntu):
importance: Undecided → Wishlist
Changed in v4l2loopback (Ubuntu Focal):
importance: High → Wishlist
Changed in v4l2loopback (Ubuntu Groovy):
importance: Undecided → Wishlist
Revision history for this message
Liz Fong-Jones (lizthegrey) wrote :

oh hey, thank you all!

Mathew Hodson (mhodson)
tags: added: upgrade-software-version
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