[FFmpeg-devel] [PATCH v4 0/7] webp: add support for animated WebP decoding

[James Zern]

On Tue, Jul 25, 2023 at 1:58 AM Thilo Borgmann <thilo.borgmann at mail.de> wrote:
>
> Still images fixed from v2. Now includes a fate test for animated webp.
>
> Patch 5/7 is still there for making changes in lavc/webp reviewable but
> shall be stashed when pushing.
>
> -Thilo
>
>
> Josef Zlomek (2):
>   libavcodec/webp: add support for animated WebP decoding
>   libavformat/webp: add WebP demuxer
>
> Thilo Borgmann (5):
>   avcodec/webp: move definitions into header
>   avcodec/webp: remove unused definitions
>   avcodec/webp_parser: parse each frame into one packet
>   avcodec/webp: make init_canvas_frame static
>   fate: add test for animated WebP
>
>  Changelog                                   |   2 +
>  doc/demuxers.texi                           |  28 +
>  libavcodec/codec_desc.c                     |   3 +-
>  libavcodec/version.h                        |   2 +-
>  libavcodec/webp.c                           | 715 +++++++++++++++++--
>  libavcodec/webp.h                           |  38 +
>  libavcodec/webp_parser.c                    | 130 ++--
>  libavformat/Makefile                        |   1 +
>  libavformat/allformats.c                    |   1 +
>  libavformat/version.h                       |   2 +-
>  libavformat/webpdec.c                       | 733 ++++++++++++++++++++
>  tests/fate/image.mak                        |   3 +
>  tests/ref/fate/exif-image-webp              |  12 +-
>  tests/ref/fate/webp-anim                    |  22 +
>  tests/ref/fate/webp-rgb-lena-lossless       |   2 +-
>  tests/ref/fate/webp-rgb-lena-lossless-rgb24 |   2 +-
>  tests/ref/fate/webp-rgb-lossless            |   2 +-
>  tests/ref/fate/webp-rgb-lossy-q80           |   2 +-
>  tests/ref/fate/webp-rgba-lossless           |   2 +-
>  tests/ref/fate/webp-rgba-lossy-q80          |   2 +-
>  20 files changed, 1589 insertions(+), 115 deletions(-)
>  create mode 100644 libavcodec/webp.h
>  create mode 100644 libavformat/webpdec.c
>  create mode 100644 tests/ref/fate/webp-anim
>

This series is lgtm. There are still a few edge cases where 1) the
'Canvas change detected' warning will be triggered with valid files,
2) corrupt / truncated files will produce output where they would fail
with libwebp and 3) I see quite a few "[webp @ 0x7f5530008c00]
Multiple ff_thread_finish_setup() calls", not sure if that's expected.