Re: gstreamermm element wrapper-code generator

[José Alburquerque <jaalburquerque cox net>]

Milosz Derezynski wrote:
> Hey All,
>
> So here is the first version of the promised element wrapper 
> generator. It is directly based off gstreamer's CVS-as-of-today 
> gst-inspect tool (http://linux.die.net/man/1/gst-inspect-0.10)
>
> You can compile it with:
>
> g++ -o wrapper wrapper.cc `pkg-config --libs --cflags gstreamermm-0.10 
> glibmm-2.4`
>
> and run it similar to glib-genmarshal:
>
> 'wrapper --header <element name>' (e.g. "ximagesink") will output the 
> header file and
> 'wrapper --body <element name>' the corresponding body file
>
> What remains to be done (in both senses) is the include of the header 
> into the body since the output
> so far happens to stdout, just open the body file and add the include 
> of the generated header file (to
> generate header/body file as files just use the shell redirect).
>
> What works:
>
> - Creates a class named after the given element
> - Wraps all properties of a given GstElement as Glib::Object C++ 
> properties

I'm open to this idea.  I had not been able to grasp the aspect of 
generating code to deal with plugins better, but it does look promising.

> What doesn't work (yet):
>
> - Wrapping signals. This will be tough because there exists nothing in 
> glibmm/gtkmm to semi-automatically wrap C signals like we can do with 
> properties, hence we will need parts of gmmproc to do that for us; i 
> have yet to figure out what a good way is, help very appreciated
>
> What is bad:
>
> - The way the wrapper class wraps the generic Gst::Element in question 
> is probably very _bad_. I just don't really know how to do this, 
> because Glib::wrap won't work: we would everytime pass just a simple 
> plain GstObject* to wrap(), and wrap() wouldn't know how to 
> differentiate then, so this is out of the question. Comments here very 
> appreciated.
>
> -- Milosz
>
>
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--
José Alburquerque
jaalburquerque cox net

The path to real wisdom begins with a deep loving respect for the ever living God (Prov. 1:7)