[Ffmpeg-devel] plug-n-play codecs support

[Michael Niedermayer]

Hi

On Saturday 30 April 2005 11:19, Arpi wrote:
> Hi,
>
> > M?ns Rullg?rd wrote:
> > > Aaron Lee <waifunlee at gmail.com> writes:
> > > > I would like to build a ffmpeg dynamic loading mechanism such that
> > > > codecs can be built as a dll and be loaded at runtime rather than
> > > > statically bundle all codecs in a big library. Has anyone done that
> > > > before?
> > >
> > > Many of the codecs share the core components, only the bit parsing
> > > being specific.  This means that the cost of each codec isn't as high
> > > as it might seem.
> >
> >   In addition i think it would be way more useful to make the codecs
> > selectable at compile time which is in the works if i understood
>
> the problem(?) is that they share a lot more.
> try to remove a codec file from Makefile, and see how many other
> codecs use some code from it. the libavcodec codecs has a lot
> cross-dependency on eachother, sharing small helper functions or
> sometimes even big parsers (with some if()'s inside to check codec type).

i think you overestimate the dependencies, AFAIK, the dependencies should be 
mostly sane like that h263 based codecs need h263*.{c,h} dct/MC based codecs 
need mpegvideo.{c,h}

[...]

-- 
Michael

"nothing is evil in the beginning. Even Sauron was not so." -- Elrond