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1 | .. Permission is granted to copy, distribute and/or modify this |
2 | .. document under the terms of the GNU Free Documentation License, | |
3 | .. Version 1.1 or any later version published by the Free Software | |
4 | .. Foundation, with no Invariant Sections, no Front-Cover Texts | |
5 | .. and no Back-Cover Texts. A copy of the license is included at | |
6 | .. Documentation/media/uapi/fdl-appendix.rst. | |
7 | .. | |
8 | .. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections | |
9 | ||
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10 | .. _effect: |
11 | ||
12 | ************************ | |
13 | Effect Devices Interface | |
14 | ************************ | |
15 | ||
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16 | .. note:: |
17 | This interface has been be suspended from the V4L2 API. | |
18 | The implementation for such effects should be done | |
19 | via mem2mem devices. | |
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20 | |
21 | A V4L2 video effect device can do image effects, filtering, or combine | |
22 | two or more images or image streams. For example video transitions or | |
23 | wipes. Applications send data to be processed and receive the result | |
24 | data either with :ref:`read() <func-read>` and | |
25 | :ref:`write() <func-write>` functions, or through the streaming I/O | |
26 | mechanism. | |
27 | ||
28 | [to do] |