[FFmpeg-devel] [PATCH 01/11] avcodec: add avcodec_get_supported_config()

[Michael Niedermayer]

On Mon, Apr 08, 2024 at 10:18:33PM +0200, Michael Niedermayer wrote:
> On Fri, Apr 05, 2024 at 08:57:11PM +0200, Niklas Haas wrote:
> > From: Niklas Haas <git at haasn.dev>
> > 
> > This replaces the myriad of existing lists in AVCodec by a unified API
> > call, allowing us to (ultimately) trim down the sizeof(AVCodec) quite
> > substantially, while also making this more trivially extensible.
> > 
> > In addition to the already covered lists, add two new entries for color
> > space and color range, mirroring the newly added negotiable fields in
> > libavfilter.
> > 
> > I decided to drop the explicit length field from the API proposed by
> > Andreas Rheinhardt, because having it in place ended up complicating
> > both the codec side and the client side implementations, while also
> > being strictly less flexible (it's trivial to recover a length given
> > a terminator, but requires allocation to add a terminator given
> > a length). Using a terminator also presents less of a porting challenge
> > for existing users of the current API.
> > 
> > Once the deprecation period passes for the existing public fields, the
> > rough plan is to move the commonly used fields (such as
> > pix_fmt/sample_fmt) into FFCodec, possibly as a union of audio and video
> > configuration types, and then implement the rarely used fields with
> > custom callbacks.
> > ---
> >  doc/APIchanges              |  5 ++++
> >  libavcodec/avcodec.c        | 51 +++++++++++++++++++++++++++++++++++++
> >  libavcodec/avcodec.h        | 27 ++++++++++++++++++++
> >  libavcodec/codec.h          | 19 +++++++++++---
> >  libavcodec/codec_internal.h | 21 +++++++++++++++
> >  libavcodec/version.h        |  4 +--
> >  6 files changed, 121 insertions(+), 6 deletions(-)
> 
> This patchset seems to overlap a bit with AVOptionRanges
> 
> I think ideally the user should at some point be able to query using some
> API on a AVCodecContext/AVCodecParameters/AVFormatContex/AVStream
> what for that specific instance are supported settings for each field

let me clarify this a bit more, what i envission is some generic API
that can take any AVClass/AVOption suporting struct and query a instance
of it for supported ranges/lists of a AVOption field.
some AVCodec passed into that call in addition to a AVCodecContext would
be more messy in a generic API

thx

[...]

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

No great genius has ever existed without some touch of madness. -- Aristotle
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