Re: [FFmpeg-devel] [PATCH 1/2] libavcodec/webp: add support for animated WebP decoding

From: Anton Khirnov <anton@khirnov.net>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Cc: Josef Zlomek <josef@pex.com>
Subject: Re: [FFmpeg-devel] [PATCH 1/2] libavcodec/webp: add support for animated WebP decoding
Date: Tue, 09 May 2023 08:23:18 +0200
Message-ID: <168361339824.3843.857116725628388166@lain.khirnov.net> (raw)
In-Reply-To: <20230427180851.92573-2-thilo.borgmann@mail.de>

Quoting Thilo Borgmann (2023-04-27 20:08:50)
> From: Josef Zlomek <josef@pex.com>
> 
> Fixes: 4907
> 
> Adds support for decoding of animated WebP.
> 
> The WebP parser now splits the input stream into packets containing one frame.
> 
> The WebP decoder adds the animation related features according to the specs:
> https://developers.google.com/speed/webp/docs/riff_container#animation
> The frames of the animation may be smaller than the image canvas.
> Therefore, the frame is decoded to a temporary frame,
> then it is blended into the canvas, the canvas is copied to the output frame,
> and finally the frame is disposed from the canvas.
> 
> The output to AV_PIX_FMT_YUVA420P/AV_PIX_FMT_YUV420P is still supported.
> The background color is specified only as BGRA in the WebP file
> so it is converted to YUVA if YUV formats are output.
> 
> Signed-off-by: Josef Zlomek <josef@pex.com>
> ---
>  Changelog                |   1 +
>  libavcodec/codec_desc.c  |   3 +-
>  libavcodec/version.h     |   2 +-
>  libavcodec/webp.c        | 713 +++++++++++++++++++++++++++++++++++----

This patch is unreadable and should be split.

-- 
Anton Khirnov
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