1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
3 .. _VIDIOC_SUBDEV_ENUM_MBUS_CODE:
5 **********************************
6 ioctl VIDIOC_SUBDEV_ENUM_MBUS_CODE
7 **********************************
12 VIDIOC_SUBDEV_ENUM_MBUS_CODE - Enumerate media bus formats
18 .. c:function:: int ioctl( int fd, VIDIOC_SUBDEV_ENUM_MBUS_CODE, struct v4l2_subdev_mbus_code_enum * argp )
19 :name: VIDIOC_SUBDEV_ENUM_MBUS_CODE
26 File descriptor returned by :ref:`open() <func-open>`.
29 Pointer to struct :c:type:`v4l2_subdev_mbus_code_enum`.
35 To enumerate media bus formats available at a given sub-device pad
36 applications initialize the ``pad``, ``which`` and ``index`` fields of
38 :c:type:`v4l2_subdev_mbus_code_enum` and
39 call the :ref:`VIDIOC_SUBDEV_ENUM_MBUS_CODE` ioctl with a pointer to this
40 structure. Drivers fill the rest of the structure or return an ``EINVAL``
41 error code if either the ``pad`` or ``index`` are invalid. All media bus
42 formats are enumerable by beginning at index zero and incrementing by
43 one until ``EINVAL`` is returned.
45 Available media bus formats may depend on the current 'try' formats at
46 other pads of the sub-device, as well as on the current active links.
47 See :ref:`VIDIOC_SUBDEV_G_FMT` for more
48 information about the try formats.
51 .. c:type:: v4l2_subdev_mbus_code_enum
53 .. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}|
55 .. flat-table:: struct v4l2_subdev_mbus_code_enum
62 - Pad number as reported by the media controller API.
65 - Number of the format in the enumeration, set by the application.
68 - The media bus format code, as defined in
69 :ref:`v4l2-mbus-format`.
72 - Media bus format codes to be enumerated, from enum
73 :ref:`v4l2_subdev_format_whence <v4l2-subdev-format-whence>`.
76 - See :ref:`v4l2-subdev-mbus-code-flags`
79 - Reserved for future extensions. Applications and drivers must set
84 .. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{7.7cm}|
86 .. _v4l2-subdev-mbus-code-flags:
88 .. flat-table:: Subdev Media Bus Code Enumerate Flags
93 * - V4L2_SUBDEV_MBUS_CODE_CSC_COLORSPACE
95 - The driver allows the application to try to change the default colorspace
96 encoding. The application can ask to configure the colorspace of the
97 subdevice when calling the :ref:`VIDIOC_SUBDEV_S_FMT <VIDIOC_SUBDEV_G_FMT>`
98 ioctl with :ref:`V4L2_MBUS_FRAMEFMT_SET_CSC <mbus-framefmt-set-csc>` set.
99 See :ref:`v4l2-mbus-format` on how to do this.
100 * - V4L2_SUBDEV_MBUS_CODE_CSC_XFER_FUNC
102 - The driver allows the application to try to change the default transform function.
103 The application can ask to configure the transform function of
104 the subdevice when calling the :ref:`VIDIOC_SUBDEV_S_FMT <VIDIOC_SUBDEV_G_FMT>`
105 ioctl with :ref:`V4L2_MBUS_FRAMEFMT_SET_CSC <mbus-framefmt-set-csc>` set.
106 See :ref:`v4l2-mbus-format` on how to do this.
107 * - V4L2_SUBDEV_MBUS_CODE_CSC_YCBCR_ENC
109 - The driver allows the application to try to change the default Y'CbCr
110 encoding. The application can ask to configure the Y'CbCr encoding of the
111 subdevice when calling the :ref:`VIDIOC_SUBDEV_S_FMT <VIDIOC_SUBDEV_G_FMT>`
112 ioctl with :ref:`V4L2_MBUS_FRAMEFMT_SET_CSC <mbus-framefmt-set-csc>` set.
113 See :ref:`v4l2-mbus-format` on how to do this.
114 * - V4L2_SUBDEV_MBUS_CODE_CSC_HSV_ENC
116 - The driver allows the application to try to change the default HSV
117 encoding. The application can ask to configure the HSV encoding of the
118 subdevice when calling the :ref:`VIDIOC_SUBDEV_S_FMT <VIDIOC_SUBDEV_G_FMT>`
119 ioctl with :ref:`V4L2_MBUS_FRAMEFMT_SET_CSC <mbus-framefmt-set-csc>` set.
120 See :ref:`v4l2-mbus-format` on how to do this.
121 * - V4L2_SUBDEV_MBUS_CODE_CSC_QUANTIZATION
123 - The driver allows the application to try to change the default
124 quantization. The application can ask to configure the quantization of
125 the subdevice when calling the :ref:`VIDIOC_SUBDEV_S_FMT <VIDIOC_SUBDEV_G_FMT>`
126 ioctl with :ref:`V4L2_MBUS_FRAMEFMT_SET_CSC <mbus-framefmt-set-csc>` set.
127 See :ref:`v4l2-mbus-format` on how to do this.
132 On success 0 is returned, on error -1 and the ``errno`` variable is set
133 appropriately. The generic error codes are described at the
134 :ref:`Generic Error Codes <gen-errors>` chapter.
138 :c:type:`v4l2_subdev_mbus_code_enum`
139 ``pad`` references a non-existing pad, or the ``index`` field is out