[FFmpeg-devel] [PATCH] avcodec: Add AVClass to AVCodecParameters
michael at niedermayer.cc
Tue May 17 23:06:04 CEST 2016
On Tue, May 17, 2016 at 10:00:38PM +0200, Nicolas George wrote:
> Le nonidi 29 floréal, an CCXXIV, Ronald S. Bultje a écrit :
> > It's not for us (ffmpeg.c developers), it's for people using the ffmpeg
> > libraries on other language platforms (e.g. python).
> I think one of the cruxes of the issue is that we are (ab)using the AVOption
> system for two different things: introspection and uniform access to
> structure members for libraries and language bindings, and user interaction.
> For introspection to work, all public fields of all structures that have
> some need to be accessible. Libraries can make a few exceptions, and
> therefore we can get away with one "almost" in the previous sentence, but
> not two. We are nowhere near it and we will never achieve it. And we
> probably would not want it anyway. Plus, the AV_OPT_TYPE system is way too
> limited and the lookup is very inefficient.
> Michael used the AVOption system as a quick way to give access to fields
> that were not present in the fork without breaking ABI compatibility, but I
> think this was a mistake, it would have been better to just write an
> accessor function. Since we have dropped ABI compatibility with the fork, we
there where and are accessor functions:
git grep MAKE_ACCESSORS
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
I do not agree with what you have to say, but I'll defend to the death your
right to say it. -- Voltaire
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