media: dev-effect.rst: remove unused Effect Interface chapter

.. Permission is granted to copy, distribute and/or modify this

.. document under the terms of the GNU Free Documentation License,

.. Version 1.1 or any later version published by the Free Software

.. Foundation, with no Invariant Sections, no Front-Cover Texts

.. and no Back-Cover Texts. A copy of the license is included at

.. Documentation/media/uapi/fdl-appendix.rst.

..

.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections

.. _effect:

************************

Effect Devices Interface

************************

.. note::

    This interface has been be suspended from the V4L2 API.

    The implementation for such effects should be done

    via mem2mem devices.

A V4L2 video effect device can do image effects, filtering, or combine

two or more images or image streams. For example video transitions or

wipes. Applications send data to be processed and receive the result

data either with :ref:`read() <func-read>` and

:ref:`write() <func-write>` functions, or through the streaming I/O

mechanism.

[to do]

    dev-output

    dev-osd

    dev-codec

    dev-effect

    dev-raw-vbi

    dev-sliced-vbi

    dev-teletext