Re: [Vala] vala and gstreamer plugins

[Roland Hostettler <r hostettler gmx ch>]

On Fri, 09 Jan 2009 21:20:07 +0000
alberto colombo <a colombo kingston ac uk> wrote:

> Hello,

Hi Alberto,

> I've been playing with Vala and GStreamer to build a simple
> application... smooth like a breeze :-) However, things get difficult
> when I try to build a GStreamer plugin, i.e. and object derived from
> Gst.Element.
>
> The problem is that I need to put some code in the _base_init function
> of my plugin [1]:
>
> [...]
>
> but I can't find out how to do that in Vala. Similar problem when I
> need to add a static pad template to my plugin Class [2]:
>
> [...]

The following snippet shows how to achieve this in Vala:

public class Plugin : Gst.Element {
        class construct {
                // set the plugin information
                set_details_simple(...);
                                
                // create and add the template
                var templ = new PadTemplate(...);
                add_pad_template(templ);
        }
}

Please note the additional `class' keyword which causes valac to create
the required _base_init() function instead of the regular constructor.

> [...]
>
> Any help will be greatly appreciated. I'm using Vala 0.5.4.
> Thanks in advance
>
> alb

HTH,
Roland

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