1 .. Permission is granted to copy, distribute and/or modify this
2 .. document under the terms of the GNU Free Documentation License,
3 .. Version 1.1 or any later version published by the Free Software
4 .. Foundation, with no Invariant Sections, no Front-Cover Texts
5 .. and no Back-Cover Texts. A copy of the license is included at
6 .. Documentation/media/uapi/fdl-appendix.rst.
8 .. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
12 **************************************************************************
13 ioctl VIDIOC_G_STD, VIDIOC_S_STD, VIDIOC_SUBDEV_G_STD, VIDIOC_SUBDEV_S_STD
14 **************************************************************************
19 VIDIOC_G_STD - VIDIOC_S_STD - VIDIOC_SUBDEV_G_STD - VIDIOC_SUBDEV_S_STD - Query or select the video standard of the current input
25 .. c:function:: int ioctl( int fd, VIDIOC_G_STD, v4l2_std_id *argp )
28 .. c:function:: int ioctl( int fd, VIDIOC_S_STD, const v4l2_std_id *argp )
31 .. c:function:: int ioctl( int fd, VIDIOC_SUBDEV_G_STD, v4l2_std_id *argp )
32 :name: VIDIOC_SUBDEV_G_STD
34 .. c:function:: int ioctl( int fd, VIDIOC_SUBDEV_S_STD, const v4l2_std_id *argp )
35 :name: VIDIOC_SUBDEV_S_STD
42 File descriptor returned by :ref:`open() <func-open>`.
45 Pointer to :c:type:`v4l2_std_id`.
51 To query and select the current video standard applications use the
52 :ref:`VIDIOC_G_STD <VIDIOC_G_STD>` and :ref:`VIDIOC_S_STD <VIDIOC_G_STD>` ioctls which take a pointer to a
53 :ref:`v4l2_std_id <v4l2-std-id>` type as argument. :ref:`VIDIOC_G_STD <VIDIOC_G_STD>`
54 can return a single flag or a set of flags as in struct
55 :c:type:`v4l2_standard` field ``id``. The flags must be
56 unambiguous such that they appear in only one enumerated
57 struct :c:type:`v4l2_standard` structure.
59 :ref:`VIDIOC_S_STD <VIDIOC_G_STD>` accepts one or more flags, being a write-only ioctl it
60 does not return the actual new standard as :ref:`VIDIOC_G_STD <VIDIOC_G_STD>` does. When
61 no flags are given or the current input does not support the requested
62 standard the driver returns an ``EINVAL`` error code. When the standard set
63 is ambiguous drivers may return ``EINVAL`` or choose any of the requested
64 standards. If the current input or output does not support standard
65 video timings (e.g. if :ref:`VIDIOC_ENUMINPUT`
66 does not set the ``V4L2_IN_CAP_STD`` flag), then ``ENODATA`` error code is
73 On success 0 is returned, on error -1 and the ``errno`` variable is set
74 appropriately. The generic error codes are described at the
75 :ref:`Generic Error Codes <gen-errors>` chapter.
78 The :ref:`VIDIOC_S_STD <VIDIOC_G_STD>` parameter was unsuitable.
81 Standard video timings are not supported for this input or output.