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

[Thilo Borgmann]

Am 25.07.23 um 22:14 schrieb 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,

As long as the canvas in frame threading is bound to a ThreadFrame, we can't reallocate for changes.
Wouldn't want to touch that until the new threading is all done.


> 2) corrupt / truncated files will produce output where they would fail
> with libwebp and 

We might bail out as well though AFAICT we usually try to decode whatever might be possible.


> 3) I see quite a few "[webp @ 0x7f5530008c00]
> Multiple ff_thread_finish_setup() calls", not sure if that's expected.

Which sample you're looking at?

If I can reproduce this, I'll look at it. The other things I'd keep as they are.

Thanks,
Thilo