2f91e10ee6
Add support to manage configurations (format, crop, compose) per stream, instead of per pad. This is accomplished with data structures that hold an array of all subdev's stream configurations. The number of streams can vary at runtime based on routing. Every time the routing is changed, the stream configurations need to be re-initialized. Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
150 lines
4.9 KiB
ReStructuredText
150 lines
4.9 KiB
ReStructuredText
.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
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.. c:namespace:: V4L
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.. _VIDIOC_SUBDEV_ENUM_MBUS_CODE:
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**********************************
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ioctl VIDIOC_SUBDEV_ENUM_MBUS_CODE
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**********************************
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Name
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====
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VIDIOC_SUBDEV_ENUM_MBUS_CODE - Enumerate media bus formats
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Synopsis
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========
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.. c:macro:: VIDIOC_SUBDEV_ENUM_MBUS_CODE
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``int ioctl(int fd, VIDIOC_SUBDEV_ENUM_MBUS_CODE, struct v4l2_subdev_mbus_code_enum * argp)``
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Arguments
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=========
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``fd``
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File descriptor returned by :c:func:`open()`.
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``argp``
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Pointer to struct :c:type:`v4l2_subdev_mbus_code_enum`.
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Description
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===========
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To enumerate media bus formats available at a given sub-device pad
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applications initialize the ``pad``, ``which`` and ``index`` fields of
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struct
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:c:type:`v4l2_subdev_mbus_code_enum` and
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call the :ref:`VIDIOC_SUBDEV_ENUM_MBUS_CODE` ioctl with a pointer to this
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structure. Drivers fill the rest of the structure or return an ``EINVAL``
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error code if either the ``pad`` or ``index`` are invalid. All media bus
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formats are enumerable by beginning at index zero and incrementing by
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one until ``EINVAL`` is returned.
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Available media bus formats may depend on the current 'try' formats at
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other pads of the sub-device, as well as on the current active links.
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See :ref:`VIDIOC_SUBDEV_G_FMT` for more
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information about the try formats.
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.. c:type:: v4l2_subdev_mbus_code_enum
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.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.5cm}|
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.. flat-table:: struct v4l2_subdev_mbus_code_enum
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:header-rows: 0
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:stub-columns: 0
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:widths: 1 1 2
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* - __u32
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- ``pad``
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- Pad number as reported by the media controller API.
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* - __u32
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- ``index``
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- Number of the format in the enumeration, set by the application.
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* - __u32
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- ``code``
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- The media bus format code, as defined in
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:ref:`v4l2-mbus-format`.
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* - __u32
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- ``which``
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- Media bus format codes to be enumerated, from enum
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:ref:`v4l2_subdev_format_whence <v4l2-subdev-format-whence>`.
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* - __u32
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- ``flags``
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- See :ref:`v4l2-subdev-mbus-code-flags`
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* - __u32
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- ``stream``
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- Stream identifier.
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* - __u32
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- ``reserved``\ [6]
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- Reserved for future extensions. Applications and drivers must set
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the array to zero.
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.. raw:: latex
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\footnotesize
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.. tabularcolumns:: |p{8.8cm}|p{2.2cm}|p{6.3cm}|
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.. _v4l2-subdev-mbus-code-flags:
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.. flat-table:: Subdev Media Bus Code Enumerate Flags
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:header-rows: 0
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:stub-columns: 0
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:widths: 1 1 2
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* - V4L2_SUBDEV_MBUS_CODE_CSC_COLORSPACE
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- 0x00000001
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- The driver allows the application to try to change the default colorspace
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encoding. The application can ask to configure the colorspace of the
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subdevice when calling the :ref:`VIDIOC_SUBDEV_S_FMT <VIDIOC_SUBDEV_G_FMT>`
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ioctl with :ref:`V4L2_MBUS_FRAMEFMT_SET_CSC <mbus-framefmt-set-csc>` set.
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See :ref:`v4l2-mbus-format` on how to do this.
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* - V4L2_SUBDEV_MBUS_CODE_CSC_XFER_FUNC
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- 0x00000002
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- The driver allows the application to try to change the default transform function.
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The application can ask to configure the transform function of
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the subdevice when calling the :ref:`VIDIOC_SUBDEV_S_FMT <VIDIOC_SUBDEV_G_FMT>`
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ioctl with :ref:`V4L2_MBUS_FRAMEFMT_SET_CSC <mbus-framefmt-set-csc>` set.
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See :ref:`v4l2-mbus-format` on how to do this.
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* - V4L2_SUBDEV_MBUS_CODE_CSC_YCBCR_ENC
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- 0x00000004
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- The driver allows the application to try to change the default Y'CbCr
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encoding. The application can ask to configure the Y'CbCr encoding of the
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subdevice when calling the :ref:`VIDIOC_SUBDEV_S_FMT <VIDIOC_SUBDEV_G_FMT>`
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ioctl with :ref:`V4L2_MBUS_FRAMEFMT_SET_CSC <mbus-framefmt-set-csc>` set.
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See :ref:`v4l2-mbus-format` on how to do this.
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* - V4L2_SUBDEV_MBUS_CODE_CSC_HSV_ENC
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- 0x00000004
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- The driver allows the application to try to change the default HSV
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encoding. The application can ask to configure the HSV encoding of the
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subdevice when calling the :ref:`VIDIOC_SUBDEV_S_FMT <VIDIOC_SUBDEV_G_FMT>`
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ioctl with :ref:`V4L2_MBUS_FRAMEFMT_SET_CSC <mbus-framefmt-set-csc>` set.
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See :ref:`v4l2-mbus-format` on how to do this.
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* - V4L2_SUBDEV_MBUS_CODE_CSC_QUANTIZATION
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- 0x00000008
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- The driver allows the application to try to change the default
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quantization. The application can ask to configure the quantization of
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the subdevice when calling the :ref:`VIDIOC_SUBDEV_S_FMT <VIDIOC_SUBDEV_G_FMT>`
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ioctl with :ref:`V4L2_MBUS_FRAMEFMT_SET_CSC <mbus-framefmt-set-csc>` set.
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See :ref:`v4l2-mbus-format` on how to do this.
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.. raw:: latex
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\normalsize
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Return Value
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============
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On success 0 is returned, on error -1 and the ``errno`` variable is set
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appropriately. The generic error codes are described at the
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:ref:`Generic Error Codes <gen-errors>` chapter.
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EINVAL
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The struct
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:c:type:`v4l2_subdev_mbus_code_enum`
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``pad`` references a non-existing pad, or the ``index`` field is out
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of bounds.
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