1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
4 .. _VIDIOC_SUBDEV_ENUM_MBUS_CODE:
6 **********************************
7 ioctl VIDIOC_SUBDEV_ENUM_MBUS_CODE
8 **********************************
13 VIDIOC_SUBDEV_ENUM_MBUS_CODE - Enumerate media bus formats
18 .. c:macro:: VIDIOC_SUBDEV_ENUM_MBUS_CODE
20 ``int ioctl(int fd, VIDIOC_SUBDEV_ENUM_MBUS_CODE, struct v4l2_subdev_mbus_code_enum * argp)``
26 File descriptor returned by :c:func:`open()`.
29 Pointer to struct :c:type:`v4l2_subdev_mbus_code_enum`.
34 To enumerate media bus formats available at a given sub-device pad
35 applications initialize the ``pad``, ``which`` and ``index`` fields of
37 :c:type:`v4l2_subdev_mbus_code_enum` and
38 call the :ref:`VIDIOC_SUBDEV_ENUM_MBUS_CODE` ioctl with a pointer to this
39 structure. Drivers fill the rest of the structure or return an ``EINVAL``
40 error code if either the ``pad`` or ``index`` are invalid. All media bus
41 formats are enumerable by beginning at index zero and incrementing by
42 one until ``EINVAL`` is returned.
44 Available media bus formats may depend on the current 'try' formats at
45 other pads of the sub-device, as well as on the current active links.
46 See :ref:`VIDIOC_SUBDEV_G_FMT` for more
47 information about the try formats.
49 .. c:type:: v4l2_subdev_mbus_code_enum
51 .. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.5cm}|
53 .. flat-table:: struct v4l2_subdev_mbus_code_enum
60 - Pad number as reported by the media controller API.
63 - Number of the format in the enumeration, set by the application.
66 - The media bus format code, as defined in
67 :ref:`v4l2-mbus-format`.
70 - Media bus format codes to be enumerated, from enum
71 :ref:`v4l2_subdev_format_whence <v4l2-subdev-format-whence>`.
74 - See :ref:`v4l2-subdev-mbus-code-flags`
77 - Reserved for future extensions. Applications and drivers must set
86 .. tabularcolumns:: |p{8.8cm}|p{2.2cm}|p{6.3cm}|
88 .. _v4l2-subdev-mbus-code-flags:
90 .. flat-table:: Subdev Media Bus Code Enumerate Flags
95 * - V4L2_SUBDEV_MBUS_CODE_CSC_COLORSPACE
97 - The driver allows the application to try to change the default colorspace
98 encoding. The application can ask to configure the colorspace of the
99 subdevice when calling the :ref:`VIDIOC_SUBDEV_S_FMT <VIDIOC_SUBDEV_G_FMT>`
100 ioctl with :ref:`V4L2_MBUS_FRAMEFMT_SET_CSC <mbus-framefmt-set-csc>` set.
101 See :ref:`v4l2-mbus-format` on how to do this.
102 * - V4L2_SUBDEV_MBUS_CODE_CSC_XFER_FUNC
104 - The driver allows the application to try to change the default transform function.
105 The application can ask to configure the transform function of
106 the subdevice when calling the :ref:`VIDIOC_SUBDEV_S_FMT <VIDIOC_SUBDEV_G_FMT>`
107 ioctl with :ref:`V4L2_MBUS_FRAMEFMT_SET_CSC <mbus-framefmt-set-csc>` set.
108 See :ref:`v4l2-mbus-format` on how to do this.
109 * - V4L2_SUBDEV_MBUS_CODE_CSC_YCBCR_ENC
111 - The driver allows the application to try to change the default Y'CbCr
112 encoding. The application can ask to configure the Y'CbCr encoding of the
113 subdevice when calling the :ref:`VIDIOC_SUBDEV_S_FMT <VIDIOC_SUBDEV_G_FMT>`
114 ioctl with :ref:`V4L2_MBUS_FRAMEFMT_SET_CSC <mbus-framefmt-set-csc>` set.
115 See :ref:`v4l2-mbus-format` on how to do this.
116 * - V4L2_SUBDEV_MBUS_CODE_CSC_HSV_ENC
118 - The driver allows the application to try to change the default HSV
119 encoding. The application can ask to configure the HSV encoding of the
120 subdevice when calling the :ref:`VIDIOC_SUBDEV_S_FMT <VIDIOC_SUBDEV_G_FMT>`
121 ioctl with :ref:`V4L2_MBUS_FRAMEFMT_SET_CSC <mbus-framefmt-set-csc>` set.
122 See :ref:`v4l2-mbus-format` on how to do this.
123 * - V4L2_SUBDEV_MBUS_CODE_CSC_QUANTIZATION
125 - The driver allows the application to try to change the default
126 quantization. The application can ask to configure the quantization of
127 the subdevice when calling the :ref:`VIDIOC_SUBDEV_S_FMT <VIDIOC_SUBDEV_G_FMT>`
128 ioctl with :ref:`V4L2_MBUS_FRAMEFMT_SET_CSC <mbus-framefmt-set-csc>` set.
129 See :ref:`v4l2-mbus-format` on how to do this.
138 On success 0 is returned, on error -1 and the ``errno`` variable is set
139 appropriately. The generic error codes are described at the
140 :ref:`Generic Error Codes <gen-errors>` chapter.
144 :c:type:`v4l2_subdev_mbus_code_enum`
145 ``pad`` references a non-existing pad, or the ``index`` field is out