root/gst/gstelementfactory.h
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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000,2004 Wim Taymans <wim@fluendo.com>
*
* gstelement.h: Header for GstElement
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __GST_ELEMENT_FACTORY_H__
#define __GST_ELEMENT_FACTORY_H__
typedef struct _GstElementFactory GstElementFactory;
typedef struct _GstElementFactoryClass GstElementFactoryClass;
#include <gst/gstconfig.h>
#include <gst/gstelement.h>
#include <gst/gstobject.h>
#include <gst/gstplugin.h>
#include <gst/gstpluginfeature.h>
#include <gst/gstiterator.h>
G_BEGIN_DECLS
/* FIXME 0.11: Move GstElementDetails into a private header and use it internally
* in GstElementFactory, GstElementClass and the registry
*/
typedef struct _GstElementDetails GstElementDetails;
/**
* GstElementDetails:
* @longname: long, english name
* @klass: string describing the type of element, as an unordered list
* separated with slashes ('/'). See draft-klass.txt of the design docs
* for more details and common types
* @description: what the element is about
* @author: who wrote this thing?
*
* This struct defines the public information about a #GstElement. It contains
* meta-data about the element that is mostly for the benefit of editors.
*
* The @klass member can be used by applications to filter elements based
* on functionality.
*/
/* FIXME: need translatable stuff in here (how handle in registry)?
* can't we use _N("long name") in element implementations and use _(longname)
* in gst_element_factory_get_longname()
*/
struct _GstElementDetails
{
/*< public > */
gchar *longname;
gchar *klass;
gchar *description;
gchar *author;
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
};
/**
* GST_ELEMENT_DETAILS:
* @longname: long, english name
* @klass: string describing the type of element, as an unordered list
* separated with slashes ('/'). See draft-klass.txt of the design docs
* for more details and common types
* @description: what the element is about
* @author: who wrote this element
*
* Macro to initialize #GstElementDetails.
*/
#define GST_ELEMENT_DETAILS(longname,klass,description,author) \
{ longname, klass, description, author, {NULL} }
/**
* GST_IS_ELEMENT_DETAILS:
* @details: the #GstElementDetails to check
*
* Tests if element details are initialized.
*/
/* FIXME: what about adding '&& (*__gst_reserved==NULL)' */
#define GST_IS_ELEMENT_DETAILS(details) ( \
(details) && ((details)->longname != NULL) && ((details)->klass != NULL) \
&& ((details)->description != NULL) && ((details)->author != NULL))
#define GST_TYPE_ELEMENT_FACTORY (gst_element_factory_get_type())
#define GST_ELEMENT_FACTORY(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ELEMENT_FACTORY,\
GstElementFactory))
#define GST_ELEMENT_FACTORY_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ELEMENT_FACTORY,\
GstElementFactoryClass))
#define GST_IS_ELEMENT_FACTORY(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ELEMENT_FACTORY))
#define GST_IS_ELEMENT_FACTORY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ELEMENT_FACTORY))
#define GST_ELEMENT_FACTORY_CAST(obj) ((GstElementFactory *)(obj))
/**
* GstElementFactory:
*
* The opaque #GstElementFactory data structure.
*/
struct _GstElementFactory {
GstPluginFeature parent;
GType type; /* unique GType of element or 0 if not loaded */
GstElementDetails details;
GList * staticpadtemplates;
guint numpadtemplates;
/* URI interface stuff */
guint uri_type;
gchar ** uri_protocols;
GList * interfaces; /* interfaces this element implements */
gpointer _gst_reserved[GST_PADDING];
};
struct _GstElementFactoryClass {
GstPluginFeatureClass parent_class;
gpointer _gst_reserved[GST_PADDING];
};
GType gst_element_factory_get_type (void);
GstElementFactory * gst_element_factory_find (const gchar *name);
GType gst_element_factory_get_element_type (GstElementFactory *factory);
G_CONST_RETURN gchar * gst_element_factory_get_longname (GstElementFactory *factory);
G_CONST_RETURN gchar * gst_element_factory_get_klass (GstElementFactory *factory);
G_CONST_RETURN gchar * gst_element_factory_get_description (GstElementFactory *factory);
G_CONST_RETURN gchar * gst_element_factory_get_author (GstElementFactory *factory);
guint gst_element_factory_get_num_pad_templates (GstElementFactory *factory);
G_CONST_RETURN GList * gst_element_factory_get_static_pad_templates (GstElementFactory *factory);
gint gst_element_factory_get_uri_type (GstElementFactory *factory);
gchar ** gst_element_factory_get_uri_protocols (GstElementFactory *factory);
gboolean gst_element_factory_has_interface (GstElementFactory *factory,
const gchar *interfacename);
GstElement* gst_element_factory_create (GstElementFactory *factory,
const gchar *name);
GstElement* gst_element_factory_make (const gchar *factoryname, const gchar *name);
/* FIXME 0.11: move these two into our private headers */
void __gst_element_factory_add_static_pad_template (GstElementFactory *elementfactory,
GstStaticPadTemplate *templ);
void __gst_element_factory_add_interface (GstElementFactory *elementfactory,
const gchar *interfacename);
gboolean gst_element_register (GstPlugin *plugin, const gchar *name,
guint rank, GType type);
G_END_DECLS
#endif /* __GST_ELEMENT_FACTORY_H__ */