Re: gstreamermm option group does not init

[José Alburquerque <jaalburquerque cox net>]

Marcus Brinkmann wrote:
> At Thu, 19 Jun 2008 13:31:03 +0200,
> Murray Cumming <murrayc murrayc com> wrote:
>   
> > > >     Returns a Glib::OptionGroup with GStreamer's argument specifications.
> > > >
> > > >     The group is set up to use standard GOption callbacks, so when using
> > > >     this group in combination with GOption parsing methods, all argument
> > > >     parsing and initialization is automated.
> > > >     ...
> > > >
> > > > If you read carefully, I think you'll see that the word `initialization' 
> > > > refers to argument initialization and not gstreamermm initialization.  
> > > >         
> > > I respectfully disagree.  I think it is pretty clear that
> > > "initialization" in the gstreamer documentation of
> > > gst_init_get_option_group to mean gstreamer itself.
> > >       
> > Does gstreamer require any initialization? For instance, do you need to
> > call any init() function when not using GOption? If not, then it's
> > unlikely that the documentation means this.
> >     
>
> You need to call gst_init(&argc, &argv) or gst_init_check(&argc, &argv)
> if not using GOption.
>
>   
> > Note that we probably can hook into the GOption stuff if necessary.
> >     
>
> I think that would be best.  It must be possible, the question is what
> is the simplest solution.  How about something like this:
>
> class GstOptionGroup : public Glib::OptionGroup
> {
>   GstOptionGroup (GOptionGroup* castitem)
>     : Glib::OptionGroup (castitem) { }
>
>   virtual on_pre_parse (OptionContext& context, OptionGroup& group)
>     {
>       Glib::OptionGroup::on_pre_parse (context, group);
>       init_pre ();  /* Appropriate refactorization of Gst::init() */
>     }
>
>   virtual on_post_parse (OptionContext& context, OptionGroup& group)
>     {
>       Glib::OptionGroup::on_post_parse (context, group);
>       init_post ();  /* Appropriate refactorization of Gst::init() */
>     }
> };
>
>
> Glib::OptionGroup Gst::get_option_group()
> {
>   return GstOptionGroup (gst_init_get_option_group());
> }
>
>   

This would certainly be ideal, but unfortunately will not work because 
both init_pre() and init_post() are not publically declared.  If we 
could get GStreamer to make them public, I think this would be a pretty 
good solution.

--
José Alburquerque
jaalburquerque cox net