059b1c5b15
SPDX v3.10 gained support for GFDL-1.1 with no invariant sections: https://spdx.org/licenses/GFDL-1.1-no-invariants-or-later.html So, remove the license text, replacing them by this new SPDX license. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
55 lines
1.1 KiB
ReStructuredText
55 lines
1.1 KiB
ReStructuredText
.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
|
|
|
|
.. _VIDIOC_OVERLAY:
|
|
|
|
********************
|
|
ioctl VIDIOC_OVERLAY
|
|
********************
|
|
|
|
Name
|
|
====
|
|
|
|
VIDIOC_OVERLAY - Start or stop video overlay
|
|
|
|
|
|
Synopsis
|
|
========
|
|
|
|
.. c:function:: int ioctl( int fd, VIDIOC_OVERLAY, const int *argp )
|
|
:name: VIDIOC_OVERLAY
|
|
|
|
|
|
Arguments
|
|
=========
|
|
|
|
``fd``
|
|
File descriptor returned by :ref:`open() <func-open>`.
|
|
|
|
``argp``
|
|
Pointer to an integer.
|
|
|
|
|
|
Description
|
|
===========
|
|
|
|
This ioctl is part of the :ref:`video overlay <overlay>` I/O method.
|
|
Applications call :ref:`VIDIOC_OVERLAY` to start or stop the overlay. It
|
|
takes a pointer to an integer which must be set to zero by the
|
|
application to stop overlay, to one to start.
|
|
|
|
Drivers do not support :ref:`VIDIOC_STREAMON` or
|
|
:ref:`VIDIOC_STREAMOFF <VIDIOC_STREAMON>` with
|
|
``V4L2_BUF_TYPE_VIDEO_OVERLAY``.
|
|
|
|
|
|
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.
|
|
|
|
EINVAL
|
|
The overlay parameters have not been set up. See :ref:`overlay`
|
|
for the necessary steps.
|