[FFmpeg-devel] [PATCH v3] avcodec/libjxl: add JPEG XL decoding via libjxl

Leo Izen leo.izen at gmail.com
Sun Oct 24 04:18:46 EEST 2021

On Fri, Oct 22, 2021 at 5:38 PM Michael Niedermayer
<michael at niedermayer.cc> wrote:
> its 2 separate libraries they are often shiped by distributions in
> separate packages. libavformat can depend on libavcodec but not the
> other way around. libavcodec could get upgraded without libavformat
> separate patches make it more natural to keep this clean and working
> if a patch chages both its a hint something might be intermingled
I see, I'll split it into a libavcodec patch that handles the codec
only, and then a libavformat patch for the muxers/demuxers.

>Is there some public format spec of this ?
I will have to reverse-engineer the libjxl code, since the spec is
copyrighted and I can't access it. It might be available for a number
of CHF but I can't afford it.

Speaking of the bitstream format, this is starting to get a lot of
code in the prober, mostly because of how permissive JXL codestreams
are. I'm thinking that it might make sense to write a parser for Jpeg
XL in libavcodec, and then have libavformat's jpegxl prober just call
some of that same code. Thoughts?

-Leo Izen

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