video-fast-forward.rst

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

.. _VIDEO_FAST_FORWARD:

==================
VIDEO_FAST_FORWARD
==================

Name
----

VIDEO_FAST_FORWARD


Synopsis
--------

.. c:function:: int ioctl(fd, int request = VIDEO_FAST_FORWARD, int nFrames)


Arguments
---------

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       -  int fd

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

    -  .. row 2

       -  int request

       -  Equals VIDEO_FAST_FORWARD for this command.

    -  .. row 3

       -  int nFrames

       -  The number of frames to skip.


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

This ioctl call asks the Video Device to skip decoding of N number of
I-frames. This call can only be used if VIDEO_SOURCE_MEMORY is
selected.


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.



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       -  ``EPERM``

       -  Mode VIDEO_SOURCE_MEMORY not selected.