Conversation
jarkko

Jarkko Sakkinen

Edited 27 days ago
Writing down this for myself for the most part to get idea what to write to the cover letter later on.

My RFC driver model for v4l2-loopback will be centered around /dev/video_loop. It has only single ioctl (OOT driver has three), which has N input parameters (describing metadata for the video device) and exactly two output parameters:

1. capture_fd: communications end point for the virtual capture device. Created using anonymous inode.
2. output_nr: /dev/video{output_nr} is the V4L2 device for the output.

There is no query ioctl because any sane program should at minimum know what resources it creates and should not have privilege in the first place to peak others resources.

There is no remove ioctl because close(capture_fd) destroys /dev/video{output_nr}

Neither overlay nor dma-buf support in the initial version (should be reviewed from basis that these can be extended later on).

#linux #kernel #video4linux #v4l2loopback
0
1
0
About social.kernel.org

Terms of service

  1. Please do not use this service in violation of the Linux Kernel Code of Conduct. Doing so will result in your account suspension with the referral of the matter to the CoC committee.

  2. "Repeating"/"boosting" someone else's status on this platform will be treated as endorsement and will fall under rule #1.

  3. You are encouraged to use this platform to promote your work on the Linux Kernel, but there is no restriction on permitted topics (with the exception of anything covered by #1 above).

  4. There is no requirement to post in English, but it should be considered the primary language of communication on this platform.

Privacy notice

The admins of this service have access to all posted statuses. They aren't looking, but if it's something they shouldn't know about, then you should not post it on this platform.

Please see the Linux Foundation Privacy Policy, which applies to this platform as well.

Getting your own account

If you would like an account on this instance, please check that the following applies to you:

  • You are listed in MAINTAINERS or CREDITS

  • OR: You have a kernel.org account or email address

  • OR: You have a long and established history of involvement with the Linux Kernel

If the above is true and you agree with the Terms of Service and Privacy Notice listed above, please use these instructions to request an account: