dynamic types: Implement dynamic types in the registry

Implement GstDynamicTypeFactory as a new registry feature.

GstDynamicTypeFactory provides a way of registering a GType
into the registry, such that it will be registered as a dynamic
type when the registry is loaded, and then automatically loaded
if the type is needed during caps parsing.

This allows using non-core types in pad templates, by loading a
registry feature to create the GType on the fly.

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

1 files changed, 56 insertions, 0 deletions

diff --git a/gst/gstdynamictypefactory.h b/gst/gstdynamictypefactory.h
new file mode 100644
index 000000000..42ec4e026
--- /dev/null
+++ b/gst/gstdynamictypefactory.h
@@ -0,0 +1,56 @@
+/* GStreamer
+ * Copyright (C) 2015 Jan Schmidt <jan@centricular.com>
+ *
+ * gstdynamictypefactory.h: Header for GstDynamicTypeFactory
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __GST_DYNAMIC_TYPE_FACTORY_H__
+#define __GST_DYNAMIC_TYPE_FACTORY_H__
+
+/**
+ * GstDynamicTypeFactory:
+ *
+ * The opaque #GstDynamicTypeFactory data structure.
+ */
+typedef struct _GstDynamicTypeFactory GstDynamicTypeFactory;
+typedef struct _GstDynamicTypeFactoryClass GstDynamicTypeFactoryClass;
+
+#include <gst/gstconfig.h>
+#include <gst/gstplugin.h>
+#include <gst/gstpluginfeature.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_DYNAMIC_TYPE_FACTORY           (gst_dynamic_type_factory_get_type())
+#define GST_DYNAMIC_TYPE_FACTORY(obj)           (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_DYNAMIC_TYPE_FACTORY,\
+                                                 GstDynamicTypeFactory))
+#define GST_DYNAMIC_TYPE_CLASS(klass)           (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_DYNAMIC_TYPE_FACTORY,\
+                                                 GstDynamicTypeFactoryClass))
+#define GST_IS_DYNAMIC_TYPE_FACTORY(obj)        (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_DYNAMIC_TYPE_FACTORY))
+#define GST_IS_DYNAMIC_TYPE_FACTORY_CLASS(klass)   (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_DYNAMIC_TYPE_FACTORY))
+#define GST_DYNAMIC_TYPE_FACTORY_CAST(obj)      ((GstDynamicTypeFactory *)(obj))
+
+GType  gst_dynamic_type_factory_get_type        (void);
+
+GType  gst_dynamic_type_factory_load            (const gchar *factoryname);
+
+gboolean gst_dynamic_type_register              (GstPlugin *plugin, GType type);
+
+G_END_DECLS
+
+#endif