gstreamer/gst/gstautoplug.c

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstautoplug.c: Autoplugging of pipelines
*
* 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.
*/
//#define GST_DEBUG_ENABLED
#include "gst_private.h"
#include "gstautoplug.h"
#include "gstplugin.h"
GList* _gst_autoplugfactories;
enum {
NEW_OBJECT,
LAST_SIGNAL
};
enum {
ARG_0,
/* FILL ME */
};
static void gst_autoplug_class_init (GstAutoplugClass *klass);
static void gst_autoplug_init (GstAutoplug *autoplug);
static GstObjectClass *parent_class = NULL;
static guint gst_autoplug_signals[LAST_SIGNAL] = { 0 };
GType gst_autoplug_get_type(void)
{
static GType autoplug_type = 0;
if (!autoplug_type) {
static const GTypeInfo autoplug_info = {
sizeof(GstAutoplugClass),
NULL,
NULL,
(GClassInitFunc)gst_autoplug_class_init,
NULL,
NULL,
sizeof(GstAutoplug),
4,
(GInstanceInitFunc)gst_autoplug_init,
};
autoplug_type = g_type_register_static (GST_TYPE_OBJECT, "GstAutoplug", &autoplug_info, 0);
}
return autoplug_type;
}
static void
gst_autoplug_class_init(GstAutoplugClass *klass)
{
GObjectClass *gobject_class;
GstObjectClass *gstobject_class;
gobject_class = (GObjectClass*) klass;
gstobject_class = (GstObjectClass*) klass;
parent_class = g_type_class_ref (GST_TYPE_OBJECT);
gst_autoplug_signals[NEW_OBJECT] =
g_signal_newc ("new_object", G_OBJECT_TYPE(gobject_class), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstAutoplugClass, new_object), NULL, NULL,
g_cclosure_marshal_VOID__OBJECT, G_TYPE_NONE, 1,
GST_TYPE_OBJECT);
}
static void gst_autoplug_init(GstAutoplug *autoplug)
{
}
void
_gst_autoplug_initialize (void)
{
_gst_autoplugfactories = NULL;
}
/**
* gst_autoplug_signal_new_object:
* @autoplug: The autoplugger to emit the signal
* @object: The object that is passed to the signal
*
* Emit a new_object signal. autopluggers are supposed to
* emit this signal whenever a new object has been added to
* the autoplugged pipeline.
*
*/
void
gst_autoplug_signal_new_object (GstAutoplug *autoplug, GstObject *object)
{
g_signal_emit (G_OBJECT (autoplug), gst_autoplug_signals[NEW_OBJECT], 0, object);
}
/**
* gst_autoplug_to_caps:
* @autoplug: The autoplugger perform the autoplugging
* @srccaps: The source cpabilities
* @sinkcaps: The target capabilities
* @...: more target capabilities
*
* Perform the autoplugging procedure on the given autoplugger.
* The src caps will be connected to the sink caps.
*
* Returns: A new Element that connects the src caps to the sink caps.
*/
GstElement*
gst_autoplug_to_caps (GstAutoplug *autoplug, GstCaps *srccaps, GstCaps *sinkcaps, ...)
{
GstAutoplugClass *oclass;
GstElement *element = NULL;
va_list args;
va_start (args, sinkcaps);
oclass = GST_AUTOPLUG_CLASS (G_OBJECT_GET_CLASS(autoplug));
if (oclass->autoplug_to_caps)
element = (oclass->autoplug_to_caps) (autoplug, srccaps, sinkcaps, args);
va_end (args);
return element;
}
/**
* gst_autoplug_to_renderers:
* @autoplug: The autoplugger perform the autoplugging
* @srccaps: The source cpabilities
* @target: The target element
* @...: more target elements
*
* Perform the autoplugging procedure on the given autoplugger.
* The src caps will be connected to the target elements.
*
* Returns: A new Element that connects the src caps to the target elements.
*/
GstElement*
gst_autoplug_to_renderers (GstAutoplug *autoplug, GstCaps *srccaps, GstElement *target, ...)
{
GstAutoplugClass *oclass;
GstElement *element = NULL;
va_list args;
va_start (args, target);
oclass = GST_AUTOPLUG_CLASS (G_OBJECT_GET_CLASS(autoplug));
if (oclass->autoplug_to_renderers)
element = (oclass->autoplug_to_renderers) (autoplug, srccaps, target, args);
va_end (args);
return element;
}
/**
* gst_autoplugfactory_new:
* @name: name of autoplugfactory to create
* @longdesc: long description of autoplugfactory to create
* @type: the gtk type of the GstAutoplug element of this factory
*
* Create a new autoplugfactory with the given parameters
*
* Returns: a new #GstAutoplugFactory.
*/
GstAutoplugFactory*
gst_autoplugfactory_new (const gchar *name, const gchar *longdesc, GType type)
{
GstAutoplugFactory *factory;
g_return_val_if_fail(name != NULL, NULL);
factory = g_new0(GstAutoplugFactory, 1);
factory->name = g_strdup(name);
factory->longdesc = g_strdup (longdesc);
factory->type = type;
_gst_autoplugfactories = g_list_prepend (_gst_autoplugfactories, factory);
return factory;
}
/**
* gst_autoplugfactory_destroy:
* @factory: factory to destroy
*
* Removes the autoplug from the global list.
*/
void
gst_autoplugfactory_destroy (GstAutoplugFactory *factory)
{
g_return_if_fail (factory != NULL);
_gst_autoplugfactories = g_list_remove (_gst_autoplugfactories, factory);
// we don't free the struct bacause someone might have a handle to it..
}
/**
* gst_autoplugfactory_find:
* @name: name of autoplugfactory to find
*
* Search for an autoplugfactory of the given name.
*
* Returns: #GstAutoplugFactory if found, NULL otherwise
*/
GstAutoplugFactory*
gst_autoplugfactory_find (const gchar *name)
{
GList *walk;
GstAutoplugFactory *factory;
g_return_val_if_fail(name != NULL, NULL);
GST_DEBUG (0,"gstautoplug: find \"%s\"\n", name);
walk = _gst_autoplugfactories;
while (walk) {
factory = (GstAutoplugFactory *)(walk->data);
if (!strcmp (name, factory->name))
return factory;
walk = g_list_next (walk);
}
return NULL;
}
/**
* gst_autoplugfactory_get_list:
*
* Get the global list of autoplugfactories.
*
* Returns: GList of type #GstAutoplugFactory
*/
GList*
gst_autoplugfactory_get_list (void)
{
return _gst_autoplugfactories;
}
/**
* gst_autoplugfactory_create:
* @factory: the factory used to create the instance
*
* Create a new #GstAutoplug instance from the
* given autoplugfactory.
*
* Returns: A new #GstAutoplug instance.
*/
GstAutoplug*
gst_autoplugfactory_create (GstAutoplugFactory *factory)
{
GstAutoplug *new = NULL;
g_return_val_if_fail (factory != NULL, NULL);
if (factory->type == 0){
factory = gst_plugin_load_autoplugfactory (factory->name);
}
g_return_val_if_fail (factory != NULL, NULL);
g_return_val_if_fail (factory->type != 0, NULL);
new = GST_AUTOPLUG (g_object_new(factory->type,NULL));
return new;
}
/**
* gst_autoplugfactory_make:
* @name: the name of the factory used to create the instance
*
* Create a new #GstAutoplug instance from the
* autoplugfactory with the given name.
*
* Returns: A new #GstAutoplug instance.
*/
GstAutoplug*
gst_autoplugfactory_make (const gchar *name)
{
GstAutoplugFactory *factory;
g_return_val_if_fail (name != NULL, NULL);
factory = gst_autoplugfactory_find (name);
if (factory == NULL)
return NULL;
return gst_autoplugfactory_create (factory);;
}
/**
* gst_autoplugfactory_save_thyself:
* @factory: The facory to save
* @parent: the parent XML node pointer
*
* Save the autoplugfactory into an XML representation
*
* Returns: The new XML parent.
*/
xmlNodePtr
gst_autoplugfactory_save_thyself (GstAutoplugFactory *factory, xmlNodePtr parent)
{
g_return_val_if_fail(factory != NULL, NULL);
xmlNewChild(parent,NULL,"name",factory->name);
xmlNewChild(parent,NULL,"longdesc", factory->longdesc);
return parent;
}
/**
* gst_autoplugfactory_load_thyself:
* @parent: the parent XML node pointer
*
* Load an autoplugfactory from the given XML parent node.
*
* Returns: A new factory based on the XML node.
*/
GstAutoplugFactory*
gst_autoplugfactory_load_thyself (xmlNodePtr parent)
{
GstAutoplugFactory *factory = g_new0(GstAutoplugFactory, 1);
xmlNodePtr children = parent->xmlChildrenNode;
while (children) {
if (!strcmp(children->name, "name")) {
factory->name = xmlNodeGetContent(children);
}
if (!strcmp(children->name, "longdesc")) {
factory->longdesc = xmlNodeGetContent(children);
}
children = children->next;
}
_gst_autoplugfactories = g_list_prepend (_gst_autoplugfactories, factory);
return factory;
}