[FFmpeg-devel] [PATCH] lavu: add AVVideoHint API

[Carotti, Elias]

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From: ffmpeg-devel <ffmpeg-devel-bounces at ffmpeg.org> On Behalf Of Lynne
Sent: Sunday, July 9, 2023 3:11 PM
To: FFmpeg development discussions and patches <ffmpeg-devel at ffmpeg.org>
Subject: RE: [EXTERNAL][FFmpeg-devel] [PATCH] lavu: add AVVideoHint API

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Jul 9, 2023, 13:05 by anton at khirnov.net:

> From: Elias Carotti <eliascrt _at_ amazon _dot_ it>
>
> Add side data type to provide hint to the video encoders about 
> unchanged portions of each frame.
>
> Signed-off-by: Anton Khirnov <anton at khirnov.net>
> ---
> I've made couple small changes:
> * rebased against current master
> * consistently refer to rectangles or AVVideoRect, not blocks
> * use size_t instead of int for AVVideoHint.nb_rects
> * build unconditionally -- this is public API, it must always be  
> available regardless of what encoders are or are not available
> * tweaked documentation
>
> If you have no objections to the changes, I'll push this in a few days.
> ---
>  doc/APIchanges         |   3 ++
>  libavutil/Makefile     |   2 +
>  libavutil/frame.h      |  10 ++++
>  libavutil/version.h    |   2 +-
>  libavutil/video_hint.c |  82 +++++++++++++++++++++++++++++++  
> libavutil/video_hint.h | 108 +++++++++++++++++++++++++++++++++++++++++
>  6 files changed, 206 insertions(+), 1 deletion(-)  create mode 100644 
> libavutil/video_hint.c  create mode 100644 libavutil/video_hint.h
>

AVVideoHint is a bad name for something like this.
Could you borrow some wording from graphics and call it AVVideoDamagedHint or maybe AVVideoChangedAreaHint or a combination of both?
I'd prefer the former, damage is standard language in graphics circles about what has changed since the last frame.

Hi,
I have no strong objections on this. Personally I also like the AVVideoDamagedHint name best, my only concern is that it is strictly related to the current use/implementation 
(it's true right now that's the only kind of hint) while it may turn out to be a bad naming decision should other forms of hinting for the encoder be added in the future.
That said, I am fine with the change too.
Elias

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