video-try-command.rst

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

.. _VIDEO_TRY_COMMAND:

=================
VIDEO_TRY_COMMAND
=================

Name
----

VIDEO_TRY_COMMAND


Synopsis
--------

.. cpp:function:: int ioctl(int fd, int request = VIDEO_TRY_COMMAND, struct video_command *cmd)


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_TRY_COMMAND for this command.

    -  .. row 3

       -  struct video_command \*cmd

       -  Try a decoder command.


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

This ioctl is obsolete. Do not use in new drivers. For V4L2 decoders
this ioctl has been replaced by the
:ref:`VIDIOC_TRY_DECODER_CMD <VIDIOC_DECODER_CMD>` ioctl.

This ioctl tries a decoder command. The ``video_command`` struct is a
subset of the ``v4l2_decoder_cmd`` struct, so refer to the
:ref:`VIDIOC_TRY_DECODER_CMD <VIDIOC_DECODER_CMD>` documentation
for more information.


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.