gstreamer/gst/gstelementfactory.c
Wim Taymans 7ccc2cf90b Externalized the plugin information in /etc/gstreamer/reg.xml
Original commit message from CVS:
Externalized the plugin information in /etc/gstreamer/reg.xml
- no need to do a plugin_load_all()
- plugins are loaded when needed
- typedetect functions are loaded when needed (still buggy)
- no need to check for the existance of the plugin in the codecs
- added gstreamer-register to create the reg.xml file
- renamed launch to gstreamer-launch
- plugins need to register the typefactory they provide
modified the plugins to meet the new design
modified the plugins to correctly set their pad types
autoplugging can be done without loading the plugins now
2000-08-28 20:20:55 +00:00

244 lines
7.1 KiB
C

/* Gnome-Streamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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.
*/
#include <gst/gstelement.h>
#include <gst/gstplugin.h>
/* global list of registered elementfactories */
GList* _gst_elementfactories;
void _gst_elementfactory_initialize() {
_gst_elementfactories = NULL;
}
/**
* gst_elementfactory_register:
* @elementfactory: factory to register
*
* Adds the elementfactory to the global list, so it can be retrieved by
* name.
*/
void gst_elementfactory_register(GstElementFactory *elementfactory) {
g_return_if_fail(elementfactory != NULL);
_gst_elementfactories = g_list_prepend(_gst_elementfactories,elementfactory);
}
/**
* gst_elementfactory_find:
* @name: name of factory to find
*
* Search for an elementfactory of the given name.
*
* Returns: #GstElementFactory if found, NULL otherwise
*/
GstElementFactory *gst_elementfactory_find(gchar *name) {
GList *walk = _gst_elementfactories;
GstElementFactory *factory;
while (walk) {
factory = (GstElementFactory *)(walk->data);
if (!strcmp(name,factory->name))
return factory;
walk = g_list_next(walk);
}
return NULL;
}
/**
* gst_elementfactory_get_list:
*
* Get the global list of elementfactories.
*
* Returns: <type>GList</type> of type #GstElementFactory
*/
GList *gst_elementfactory_get_list() {
return _gst_elementfactories;
}
/**
* gst_elementfactory_new:
* @name: name of new elementfactory
* @type: GtkType of new element
* @details: #GstElementDetails structure with element details
*
* Create a new elementfactory capable of insantiating objects of the
* given type.
*
* Returns: new elementfactory
*/
GstElementFactory *gst_elementfactory_new(gchar *name,GtkType type,
GstElementDetails *details) {
GstElementFactory *factory = g_new0(GstElementFactory, 1);
factory->name = g_strdup(name);
factory->type = type;
factory->details = details;
factory->src_types = NULL;
factory->sink_types = NULL;
return factory;
}
/**
* gst_elementfactory_create:
* @factory: factory to instantiate
* @name: name of new element
*
* Create a new element of the type defined by the given elementfactory.
* It wll be given the name supplied, since all elements require a name as
* their first argument.
*
* Returns: new #GstElement
*/
GstElement *gst_elementfactory_create(GstElementFactory *factory,
gchar *name) {
GstElement *element;
GstElementClass *oclass;
g_return_val_if_fail(factory != NULL, NULL);
factory = gst_plugin_load_elementfactory(factory->name);
g_return_val_if_fail(factory->type != 0, NULL);
// create an instance of the element
element = GST_ELEMENT(gtk_type_new(factory->type));
g_assert(element != NULL);
// attempt to set the elemenfactory class pointer if necessary
oclass = GST_ELEMENT_CLASS(GTK_OBJECT(element)->klass);
if (oclass->elementfactory == NULL)
oclass->elementfactory = factory;
gst_element_set_name(GST_ELEMENT(element),name);
return element;
}
GstElement *gst_elementfactory_make(gchar *factoryname,gchar *name) {
GstElementFactory *factory;
GstElement *element;
gst_plugin_load_elementfactory(factoryname);
factory = gst_elementfactory_find(factoryname);
if (factory == NULL) return NULL;
element = gst_elementfactory_create(factory,name);
return element;
}
void gst_elementfactory_add_src(GstElementFactory *elementfactory, guint16 id) {
guint type = id;
elementfactory->src_types = g_list_prepend(elementfactory->src_types, GUINT_TO_POINTER(type));
}
void gst_elementfactory_add_sink(GstElementFactory *elementfactory, guint16 id) {
guint type = id;
elementfactory->sink_types = g_list_prepend(elementfactory->sink_types, GUINT_TO_POINTER(type));
}
xmlNodePtr gst_elementfactory_save_thyself(GstElementFactory *factory, xmlNodePtr parent) {
GList *types;
xmlNodePtr subtree;
xmlNewChild(parent,NULL,"name",factory->name);
xmlNewChild(parent,NULL,"longname", factory->details->longname);
xmlNewChild(parent,NULL,"class", factory->details->class);
xmlNewChild(parent,NULL,"description", factory->details->description);
xmlNewChild(parent,NULL,"version", factory->details->version);
xmlNewChild(parent,NULL,"author", factory->details->author);
xmlNewChild(parent,NULL,"copyright", factory->details->copyright);
types = factory->src_types;
if (types) {
subtree = xmlNewChild(parent,NULL,"sources",NULL);
while (types) {
guint16 typeid = GPOINTER_TO_UINT(types->data);
GstType *type = gst_type_find_by_id(typeid);
gst_type_save_thyself(type, subtree);
types = g_list_next(types);
}
}
types = factory->sink_types;
if (types) {
subtree = xmlNewChild(parent,NULL,"sinks",NULL);
while (types) {
guint16 typeid = GPOINTER_TO_UINT(types->data);
GstType *type = gst_type_find_by_id(typeid);
gst_type_save_thyself(type, subtree);
types = g_list_next(types);
}
}
return parent;
}
GstElementFactory *gst_elementfactory_load_thyself(xmlNodePtr parent) {
GstElementFactory *factory = g_new0(GstElementFactory, 1);
xmlNodePtr children = parent->childs;
factory->details = g_new0(GstElementDetails, 1);
factory->sink_types = NULL;
factory->src_types = NULL;
while (children) {
if (!strcmp(children->name, "name")) {
factory->name = g_strdup(xmlNodeGetContent(children));
}
if (!strcmp(children->name, "longname")) {
factory->details->longname = g_strdup(xmlNodeGetContent(children));
}
if (!strcmp(children->name, "class")) {
factory->details->class = g_strdup(xmlNodeGetContent(children));
}
if (!strcmp(children->name, "description")) {
factory->details->description = g_strdup(xmlNodeGetContent(children));
}
if (!strcmp(children->name, "version")) {
factory->details->version = g_strdup(xmlNodeGetContent(children));
}
if (!strcmp(children->name, "author")) {
factory->details->author = g_strdup(xmlNodeGetContent(children));
}
if (!strcmp(children->name, "copyright")) {
factory->details->copyright = g_strdup(xmlNodeGetContent(children));
}
if (!strcmp(children->name, "sources")) {
guint16 typeid = gst_type_load_thyself(children);
gst_type_add_src(typeid, factory);
}
if (!strcmp(children->name, "sinks")) {
guint16 typeid = gst_type_load_thyself(children);
gst_type_add_sink(typeid, factory);
}
children = children->next;
}
return factory;
}