aboutsummaryrefslogtreecommitdiffstats
path: root/Documentation/userspace-api/media/dvb/video-set-format.rst
blob: bb64e37ae0812e6212acaea2221ca84823f9cb91 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. c:namespace:: DTV.video

.. _VIDEO_SET_FORMAT:

================
VIDEO_SET_FORMAT
================

Name
----

VIDEO_SET_FORMAT

.. attention:: This ioctl is deprecated.

Synopsis
--------

.. c:macro:: VIDEO_SET_FORMAT

``int ioctl(fd, VIDEO_SET_FORMAT, video_format_t format)``

Arguments
---------

.. flat-table::
    :header-rows:  0
    :stub-columns: 0

    -  .. row 1

       -  int fd

       -  File descriptor returned by a previous call to open().

    -  .. row 2

       -  int request

       -  Equals VIDEO_SET_FORMAT for this command.

    -  .. row 3

       -  video_format_t format

       -  video format of TV as defined in section ??.

Description
-----------

This ioctl sets the screen format (aspect ratio) of the connected output
device (TV) so that the output of the decoder can be adjusted
accordingly.

.. c:type:: video_format_t

.. code-block:: c

	typedef enum {
		VIDEO_FORMAT_4_3,     /* Select 4:3 format */
		VIDEO_FORMAT_16_9,    /* Select 16:9 format. */
		VIDEO_FORMAT_221_1    /* 2.21:1 */
	} video_format_t;

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.


.. flat-table::
    :header-rows:  0
    :stub-columns: 0

    -  .. row 1

       -  ``EINVAL``

       -  format is not a valid video format.