[PATCH v9 0/1] virtio-media: Add device specification

New attempt of including virtio-media
device specification.

v8->v9:
- Rebased to virtio-1.4

v7->v8:
- Merged DQBUF and DQEVENT into the same
  item for unsupported ioctls
- Rewrote/clarified a couple paragraphs
  based on previous version reviews.

Virtio-media came from a discussion on virtio-dev
mailing list, which lead to Alex Courbot presenting
virtio-v4l2[1] specification as an alternative to
virtio-video.

Later, virtio-v4l2 was renamed to virtio-media[2]
and published at:

https://github.com/chromeos/virtio-media

The repository above includes a virtio-media driver able
to pass v4l2-compliance when proxying the vivid/vicodec
virtual devices or an actual UVC camera using the
V4L2 vhost device (available in the repository).
It also includes a FFmpeg-based video encoder
device. Steps to reproduce are also detailed[3].

Recently, virtio-media has landed in AOSP[4].
Also the driver patch has been sent to the
kernel, currently in its v2 [5].

Furthermore, virtio-media got a proposal to reserve
device ID 48, which was finally approved for
inclusion in v1.4.

There is some overlap with virtio-video in regards
to which devices it can handle. However, they take
different approaches, potentially making them
the preferable choice for different scenarios.
Furthermore, virtio-media has matured since it
was first presented, and there are public efforts
to have upstream driver and devices.

But mainly, given that virtio-media will be the virtualization
solution for media devices for ChromeOS, Android, and
possibly others, I think is important that it gets
standardized and included in the specification,
despite the aforementioned overlap.

Full PDF: https://drive.google.com/file/d/1sDZXWVlvPbHKKguhekCXMzkpNZZ0g3hV/view?usp=sharing
PDF with the media section only: https://drive.google.com/file/d/1JjOIzecnkFFlpFBRjPQEUyAOD3BDHAdw/view?usp=sharing

[1] https://mail.google.com/mail/u/0?ui=2&ik=73ebd65ebd&attid=0.1&permmsgid=msg-f:1767388565327924962&th=1887068940754ee2&view=att&disp=inline&realattid=f_libalimc0
[2] https://www.mail-archive.com/[email protected]/msg12665.html
[3] https://github.com/chromeos/virtio-media/blob/main/TRY_IT_OUT.md
[4] https://cs.android.com/android/platform/superproject/main/+/main:external/virtio-media/
[5] https://lore.kernel.org/lkml/[email protected]/T/

Albert Esteve (1):
  virtio-media: Add virtio media device specification

 conformance.tex                           |   6 +
 content.tex                               |   1 +
 device-types/media/description.tex        | 639 ++++++++++++++++++++++
 device-types/media/device-conformance.tex |  15 +
 device-types/media/driver-conformance.tex |  11 +
 5 files changed, 672 insertions(+)
 create mode 100644 device-types/media/description.tex
 create mode 100644 device-types/media/device-conformance.tex
 create mode 100644 device-types/media/driver-conformance.tex

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2.49.0