gst/gstautoplug.c - imx-gstreamer - Git at Google

 /* 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 };

 GtkType gst_autoplug_get_type(void)
 {
   static GtkType autoplug_type = 0;

   if (!autoplug_type) {
     static const GtkTypeInfo autoplug_info = {
       "GstAutoplug",
       sizeof(GstAutoplug),
       sizeof(GstAutoplugClass),
       (GtkClassInitFunc)gst_autoplug_class_init,
       (GtkObjectInitFunc)gst_autoplug_init,
       (GtkArgSetFunc)NULL,
       (GtkArgGetFunc)NULL,
       (GtkClassInitFunc)NULL,
     };
     autoplug_type = gtk_type_unique (GST_TYPE_OBJECT, &autoplug_info);
   }
   return autoplug_type;
 }

 static void
 gst_autoplug_class_init(GstAutoplugClass *klass)
 {
   GtkObjectClass *gtkobject_class;
   GstObjectClass *gstobject_class;

   gtkobject_class = (GtkObjectClass*) klass;
   gstobject_class = (GstObjectClass*) klass;

   parent_class = gtk_type_class(GST_TYPE_OBJECT);

   gst_autoplug_signals[NEW_OBJECT] =
     gtk_signal_new ("new_object", GTK_RUN_LAST, gtkobject_class->type,
                     GTK_SIGNAL_OFFSET (GstAutoplugClass, new_object),
                     gtk_marshal_NONE__POINTER, GTK_TYPE_NONE, 1,
                     GST_TYPE_OBJECT);

   gtk_object_class_add_signals (gtkobject_class, gst_autoplug_signals, LAST_SIGNAL);
 }

 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)
 {
   gtk_signal_emit (GTK_OBJECT (autoplug), gst_autoplug_signals[NEW_OBJECT], 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 (GTK_OBJECT (autoplug)->klass);
   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 (GTK_OBJECT (autoplug)->klass);
   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, GtkType 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 (gtk_type_new (factory->type));

   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;
 }
	/* 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 };

	GtkType gst_autoplug_get_type(void)
	{
	static GtkType autoplug_type = 0;

	if (!autoplug_type) {
	static const GtkTypeInfo autoplug_info = {
	"GstAutoplug",
	sizeof(GstAutoplug),
	sizeof(GstAutoplugClass),
	(GtkClassInitFunc)gst_autoplug_class_init,
	(GtkObjectInitFunc)gst_autoplug_init,
	(GtkArgSetFunc)NULL,
	(GtkArgGetFunc)NULL,
	(GtkClassInitFunc)NULL,
	};
	autoplug_type = gtk_type_unique (GST_TYPE_OBJECT, &autoplug_info);
	}
	return autoplug_type;
	}

	static void
	gst_autoplug_class_init(GstAutoplugClass *klass)
	{
	GtkObjectClass *gtkobject_class;
	GstObjectClass *gstobject_class;

	gtkobject_class = (GtkObjectClass*) klass;
	gstobject_class = (GstObjectClass*) klass;

	parent_class = gtk_type_class(GST_TYPE_OBJECT);

	gst_autoplug_signals[NEW_OBJECT] =
	gtk_signal_new ("new_object", GTK_RUN_LAST, gtkobject_class->type,
	GTK_SIGNAL_OFFSET (GstAutoplugClass, new_object),
	gtk_marshal_NONE__POINTER, GTK_TYPE_NONE, 1,
	GST_TYPE_OBJECT);

	gtk_object_class_add_signals (gtkobject_class, gst_autoplug_signals, LAST_SIGNAL);
	}

	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)
	{
	gtk_signal_emit (GTK_OBJECT (autoplug), gst_autoplug_signals[NEW_OBJECT], 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 (GTK_OBJECT (autoplug)->klass);
	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 (GTK_OBJECT (autoplug)->klass);
	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, GtkType 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 (gtk_type_new (factory->type));

	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;
	}