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.. -*- coding: utf-8; mode: rst -*-

.. _VIDIOC_OVERLAY:

********************
ioctl VIDIOC_OVERLAY
********************

*man VIDIOC_OVERLAY(2)*

Start or stop video overlay


Synopsis
========

.. c:function:: int ioctl( int fd, int request, const int *argp )

Arguments
=========

``fd``
    File descriptor returned by :ref:`open() <func-open>`.

``request``
    VIDIOC_OVERLAY

``argp``


Description
===========

This ioctl is part of the :ref:`video overlay <overlay>` I/O method.
Applications call ``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 <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.


.. ------------------------------------------------------------------------------
.. This file was automatically converted from DocBook-XML with the dbxml
.. library (https://github.com/return42/sphkerneldoc). The origin XML comes
.. from the linux kernel, refer to:
..
.. * https://github.com/torvalds/linux/tree/master/Documentation/DocBook
.. ------------------------------------------------------------------------------