[FFmpeg-devel] [RFC] Support dynamic loading of third-party libs

[wm4]

On Thu, 15 Jan 2015 18:37:57 +0100
Marc Giger <gigerstyle at gmx.ch> wrote:

> Hi Nicolas,
> 
> On Wed, 14 Jan 2015 21:33:25 +0100
> Nicolas George <george at nsup.org> wrote:
> 
> > Le quintidi 25 nivôse, an CCXXIII, Marc Giger a écrit :
> > >			   For example if they want use libfaac then
> > > they should be able to do so without that much hassle a full
> > > compilation inclusive all dependencies can be.
> > 
> > I was expecting something like that. Unfortunately, it does not work
> > that way: dlopen()ing libfaac will not allow you to omit
> > --enable-nonfree and to redistribute the resulting binary, because
> > the libfaac wrapper still includes the faac headers, which contain
> > non-trivial code (including a big structure definition) that get
> > translated into the resulting object file.
> 
> That's a very good point. Never thought about it in this detail.
> Given that fact I have to admin that dynamic loading makes
> less sense. There may still be some usecases e.g. vaapi where it
> would make sense, but this seems to be the minority.
> 
> > 
> > Apart from that, I fully agree with Michael's last comment: using
> > dynamic linker black magic to make this lazy linking transparent is
> > the best option to implement that feature if it is deemed useful.
> 
> libffi ?

libavdynamiclinker?

(Just joking...)

> 
> Thanks for the clarification.
> 
> Marc
> 
> 
> > 
> > >				     On Linux/OpenSource OS's things
> > >	are
> > > easy, on proprietary platforms ...
> > 
> > Nothing prevents users on proprietary platforms from adopting
> > automated repositories like Debian's apt system and everything that
> > imitated it since to install Libre software, except the users'
> > habits. Using such a repository to distribute your project is a good
> > way of pushing users to change their habits for the better.
> > 
> > Regards,
> > 
> > -- 
> >   Nicolas George
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