linux-kernel - [PATCH v3 0/2] Enumerate all pixels formats

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Message-ID: <20240709161710.83109-1-benjamin.gaignard@collabora.com>
Date: Tue,  9 Jul 2024 18:17:08 +0200
From: Benjamin Gaignard <benjamin.gaignard@...labora.com>
To: mchehab@...nel.org,
	ezequiel@...guardiasur.com.ar,
	hverkuil-cisco@...all.nl
Cc: linux-media@...r.kernel.or,
	linux-kernel@...r.kernel.org,
	linux-rockchip@...ts.infradead.org,
	kernel@...labora.com,
	Benjamin Gaignard <benjamin.gaignard@...labora.com>
Subject: [PATCH v3 0/2] Enumerate all pixels formats

The goal of this series is to let userland applications enumerate
all the supported pixels formats of a stateless decoder without
setting all the possible codec-dependent control.
That offer a simplest solution for applications to discover
supported pixels formats and possibly let them doing smarter
choice between stateless decoders.

An example of how it can be used in GStreamer to discover the
supported pixels formats for stateless decoder is available here:
https://gitlab.freedesktop.org/benjamin.gaignard1/gstreamer/-/commits/v4l2codecs_enum_all_supported_formats?ref_type=heads

changes in version 3:
- Add a flag to inform userspace application that driver
  as take care of the flag.

changes in version 2:
- Clarify documentation.
- Only keep V4L2_FMT_FLAG_ALL_FORMATS flag in ioctl.

Benjamin
 
Benjamin Gaignard (2):
  media: videodev2: Add flags to unconditionnaly enumerate pixels
    formats
  media: verisilicon: Use V4L2_FMT_FLAG_ENUM_ALL_FORMATS flag

 .../media/v4l/dev-stateless-decoder.rst          |  6 ++++++
 .../userspace-api/media/v4l/vidioc-enum-fmt.rst  | 10 ++++++++++
 .../media/videodev2.h.rst.exceptions             |  2 ++
 drivers/media/platform/verisilicon/hantro_v4l2.c | 16 +++++++++++++---
 drivers/media/v4l2-core/v4l2-ioctl.c             |  3 +++
 include/uapi/linux/videodev2.h                   |  2 ++
 6 files changed, 36 insertions(+), 3 deletions(-)

-- 
2.43.0