[Bug 750079] New: idea for dynamic caps types

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=750079

            Bug ID: 750079
           Summary: idea for dynamic caps types
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: thaytan at noraisin.net
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Here's a patch for an idea to allow new types to be added to caps and pad
templates. In the past, it's been a problem that you can only use types from
GLib or GStreamer core sensibly in caps (especially pad templates), because
they need to be deserialised from the registry.

This patch adds a new registry feature GstDynamicTypeFactory, that allows for
registering a GType by name. If the name is encountered in a caps
string/structure during deserialisation, it triggers loading a plugin to
register the GType.

I'm using this in the stereoscopic branch to allow registration of the
'multiview-flags' caps field, which is a GstVideoMultiviewFlagsSet derived from
a GstFlagSet. Registering the type allows serialising/deserialising a
human-readable version of the flags, instead of just numeric values.

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