[Bug 698927] LADSPA improved port to gstreamer 1.0

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=698927
  GStreamer | gst-plugins-bad | git

--- Comment #5 from Stefan Sauer (gstreamer, gtkdoc dev) <ensonic at sonicpulse.de> 2013-04-30 06:31:01 UTC ---
_get_type() function are normally needed if you instantiate GObjects through a
know GType (e.g. g_object_new(GST_LADSPA_SOURCE, ...); ). This is not the case
in GStreamer. All the plugins register elements into a name:gtype map. Later
elements can be created from the GstElementFactory by name. In the ladspa case,
we would need a new get_type() function for each element that we wrap. This
does not scale. Thus in ladspa_describe_source_plugin() we create a new gtype
and register it. This we can repeat for many <name,gtype> pairs.

Regarding gstmyutils:
It contains 3 functions. Please move them to gstladspa{source,filter,sink}.c as
static helpers respectively.

Regarding the module:
It is okay for plugins to 'leak' a one-time allocation. This will be freed when
the application exits. When the plugins are scanned for the first time, this is
done from a separate process to not impose the memory overhead on the calling
application (among other reasons). Please remove the use of the type module.
You can add a comment to such allocations and tell that it is a one time
allocation that is not freed. We do have this in other wrapper plugins too.

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