[FFmpeg-devel] [PATCH v3 2/3] avformat/avio{, buf}: deprecate AVIOContext::written

[Jan Ekström]

On Thu, Oct 21, 2021 at 11:49 PM Michael Niedermayer
<michael at niedermayer.cc> wrote:
>
> On Thu, Oct 21, 2021 at 08:48:35PM +0300, Jan Ekström wrote:
> > On Thu, Oct 21, 2021 at 8:26 PM Michael Niedermayer
> > <michael at niedermayer.cc> wrote:
> > >
> > > On Wed, Oct 20, 2021 at 12:02:13AM +0300, Jan Ekström wrote:
> > > > On Mon, Oct 18, 2021 at 3:47 PM Jan Ekström <jeebjp at gmail.com> wrote:
> > > > >
> > > > > Originally added as a private entry in commit
> > > > > 3f75e5116b900f1428aa13041fc7d6301bf1988a, but its grouping with
> > > > > the comment noting its private state was missed during merging of
> > > > > the field from Libav (most likely due to an already existing field
> > > > > in between).
> > > > > ---
> > >
> > > Its a public struct in a public header so deprecate
> > >
> > > thx
> > >
> >
> > OK, just confirming but so you don't consider this to be of the same
> > type as these http://git.videolan.org/?p=ffmpeg.git;a=blobdiff;f=libavformat/avio.h;h=a7b56ab6674f0a25be3b480df314e2d1292f397b;hp=0b35409787c925d681a121aa8d8715c3921fddf2;hb=45bfe8b838275235412777dd430206d9a24eb3ee;hpb=530ac6aa305aeda631c77f8a17e96c14c7ab1a1c
> > ?
>
> i assume this was during ABI bumping,
> when the major version numbers change then ABI/API breaking changes can be
> done.
>

IIRC ABI breakage after bumping was supposed to be a ~month but then
IIRC people posted such things much later. Was there a message or note
when this period ended?

> Try to write an application which links to a shared lib and then change the
> public structs of that lib by removing a field.
> the ABI/API major numbers have to be bumped when incompatible changes are
> done. That way they can co exist on a machiene, application build against
> the old continue working and so on ...
>

For the record, I know what ABI bumping is. I was just unclear whether
we were already past ABI instability period or not due to
4.5/5.0/whatever not still being made and due to there (as far as I
know) there being no clear message on when the ABI instability period
would end.

Jan