mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 04:05:21 +07:00
18e6830a63
This is not needed there. Also, the same UTF-8 encoding should be used on all documents. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
117 lines
3.4 KiB
ReStructuredText
117 lines
3.4 KiB
ReStructuredText
.. _VIDIOC_SUBDEV_ENUM_FRAME_SIZE:
|
|
|
|
***********************************
|
|
ioctl VIDIOC_SUBDEV_ENUM_FRAME_SIZE
|
|
***********************************
|
|
|
|
Name
|
|
====
|
|
|
|
VIDIOC_SUBDEV_ENUM_FRAME_SIZE - Enumerate media bus frame sizes
|
|
|
|
|
|
Synopsis
|
|
========
|
|
|
|
.. c:function:: int ioctl( int fd, VIDIOC_SUBDEV_ENUM_FRAME_SIZE, struct v4l2_subdev_frame_size_enum * argp )
|
|
:name: VIDIOC_SUBDEV_ENUM_FRAME_SIZE
|
|
|
|
|
|
Arguments
|
|
=========
|
|
|
|
``fd``
|
|
File descriptor returned by :ref:`open() <func-open>`.
|
|
|
|
``argp``
|
|
Pointer to struct :c:type:`v4l2_subdev_frame_size_enum`.
|
|
|
|
|
|
Description
|
|
===========
|
|
|
|
This ioctl allows applications to enumerate all frame sizes supported by
|
|
a sub-device on the given pad for the given media bus format. Supported
|
|
formats can be retrieved with the
|
|
:ref:`VIDIOC_SUBDEV_ENUM_MBUS_CODE`
|
|
ioctl.
|
|
|
|
To enumerate frame sizes applications initialize the ``pad``, ``which``
|
|
, ``code`` and ``index`` fields of the struct
|
|
:c:type:`v4l2_subdev_mbus_code_enum` and
|
|
call the :ref:`VIDIOC_SUBDEV_ENUM_FRAME_SIZE` ioctl with a pointer to the
|
|
structure. Drivers fill the minimum and maximum frame sizes or return an
|
|
EINVAL error code if one of the input parameters is invalid.
|
|
|
|
Sub-devices that only support discrete frame sizes (such as most
|
|
sensors) will return one or more frame sizes with identical minimum and
|
|
maximum values.
|
|
|
|
Not all possible sizes in given [minimum, maximum] ranges need to be
|
|
supported. For instance, a scaler that uses a fixed-point scaling ratio
|
|
might not be able to produce every frame size between the minimum and
|
|
maximum values. Applications must use the
|
|
:ref:`VIDIOC_SUBDEV_S_FMT <VIDIOC_SUBDEV_G_FMT>` ioctl to try the
|
|
sub-device for an exact supported frame size.
|
|
|
|
Available frame sizes may depend on the current 'try' formats at other
|
|
pads of the sub-device, as well as on the current active links and the
|
|
current values of V4L2 controls. See
|
|
:ref:`VIDIOC_SUBDEV_G_FMT` for more
|
|
information about try formats.
|
|
|
|
|
|
.. c:type:: v4l2_subdev_frame_size_enum
|
|
|
|
.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}|
|
|
|
|
.. flat-table:: struct v4l2_subdev_frame_size_enum
|
|
:header-rows: 0
|
|
:stub-columns: 0
|
|
:widths: 1 1 2
|
|
|
|
* - __u32
|
|
- ``index``
|
|
- Number of the format in the enumeration, set by the application.
|
|
* - __u32
|
|
- ``pad``
|
|
- Pad number as reported by the media controller API.
|
|
* - __u32
|
|
- ``code``
|
|
- The media bus format code, as defined in
|
|
:ref:`v4l2-mbus-format`.
|
|
* - __u32
|
|
- ``min_width``
|
|
- Minimum frame width, in pixels.
|
|
* - __u32
|
|
- ``max_width``
|
|
- Maximum frame width, in pixels.
|
|
* - __u32
|
|
- ``min_height``
|
|
- Minimum frame height, in pixels.
|
|
* - __u32
|
|
- ``max_height``
|
|
- Maximum frame height, in pixels.
|
|
* - __u32
|
|
- ``which``
|
|
- Frame sizes to be enumerated, from enum
|
|
:ref:`v4l2_subdev_format_whence <v4l2-subdev-format-whence>`.
|
|
* - __u32
|
|
- ``reserved``\ [8]
|
|
- Reserved for future extensions. Applications and drivers must set
|
|
the array to zero.
|
|
|
|
|
|
Return Value
|
|
============
|
|
|
|
On success 0 is returned, on error -1 and the ``errno`` variable is set
|
|
appropriately. The generic error codes are described at the
|
|
:ref:`Generic Error Codes <gen-errors>` chapter.
|
|
|
|
EINVAL
|
|
The struct
|
|
:c:type:`v4l2_subdev_frame_size_enum`
|
|
``pad`` references a non-existing pad, the ``code`` is invalid for
|
|
the given pad or the ``index`` field is out of bounds.
|