Public bug reported: In addition to kernel/firmware proposed in bug 1921345, several user space daemons/libraries, as well as fixes/features in v4l2loopback-dkms, are also required to have seamless support for legacy/existing Linux kernel V4L2 API based applications to adopt libcamera or Intel libcamhal provided camera interfaces.
The idea is to add a v4l2 streaming relay daemon (currently developed in [1] and packaged in [2]) that helps redirecting V4L2 buffer streams into v4l2loopback output device, and then legacy apps open v4l2loopback capture device in the ordinary way. hw -> libcamera/libcamhal -> v4l2-relayd -> v4l2loopback -> v4l2-based apps To achieve this, we'd like v4l2-relayd to only open GStreamer icamerasrc pipeline (provided by [3],[4]) when there is actual usage request from v4l2-based apps for privacy and power consumption's concerns. However, current (0.12.5 and therefore Ubuntu/Debian 0.12.5-1) doesn't have any available mechanism for this, therefore a V4L2 Event API based proposal has been sent and accepted by upstream[5][6]. This is needed for Ubuntu OEM projects with MIPI cameras through Intel IPU6 (Imaging Processing Unit version 6). [1]: https://gitlab.com/vicamo/v4l2-relayd [2]: https://code.launchpad.net/~oem-solutions-engineers/v4l2-relayd/+git/packaging [3]: https://github.com/intel/ipu6-camera-hal [4]: https://github.com/intel/icamerasrc [5]: https://github.com/umlaeute/v4l2loopback/pull/345 [6]: https://github.com/umlaeute/v4l2loopback/pull/352 ** Affects: hwe-next Importance: Undecided Status: New ** Affects: v4l2loopback (Ubuntu) Importance: Undecided Assignee: You-Sheng Yang (vicamo) Status: New ** Affects: v4l2loopback (Ubuntu Focal) Importance: Undecided Status: New ** Affects: v4l2loopback (Ubuntu Hirsute) Importance: Undecided Assignee: You-Sheng Yang (vicamo) Status: New ** Tags: fossa-mewtwo ihv-intel oem-priority originate-from-1917691 somerville ** Also affects: v4l2loopback (Ubuntu Hirsute) Importance: Undecided Assignee: You-Sheng Yang (vicamo) Status: New ** Also affects: v4l2loopback (Ubuntu Focal) Importance: Undecided Status: New ** Tags added: oem-priority originate-from-1917691 somerville -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1921474 Title: Support client usage notification via V4l2 Event API To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1921474/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
