gstreamer/gst/gstobject.c

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstobject.c: Fundamental class used for all of GStreamer
*
* 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_private.h"
#include "gstobject.h"
/* Object signals and args */
enum {
PARENT_SET,
OBJECT_SAVED,
LAST_SIGNAL
};
enum {
ARG_0,
/* FILL ME */
};
enum {
SO_OBJECT_LOADED,
SO_LAST_SIGNAL
};
typedef struct _GstSignalObject GstSignalObject;
typedef struct _GstSignalObjectClass GstSignalObjectClass;
static GtkType gst_signal_object_get_type (void);
static void gst_signal_object_class_init (GstSignalObjectClass *klass);
static void gst_signal_object_init (GstSignalObject *object);
static guint gst_signal_object_signals[SO_LAST_SIGNAL] = { 0 };
static void gst_object_class_init (GstObjectClass *klass);
static void gst_object_init (GstObject *object);
static void gst_object_real_destroy (GtkObject *gtk_object);
static void gst_object_shutdown (GtkObject *gtk_object);
static void gst_object_finalize (GtkObject *gtk_object);
static GtkObjectClass *parent_class = NULL;
static guint gst_object_signals[LAST_SIGNAL] = { 0 };
void
gst_object_inititialize (void)
{
}
GtkType
gst_object_get_type (void)
{
static GtkType object_type = 0;
if (!object_type) {
static const GtkTypeInfo object_info = {
"GstObject",
sizeof(GstObject),
sizeof(GstObjectClass),
(GtkClassInitFunc)gst_object_class_init,
(GtkObjectInitFunc)gst_object_init,
(GtkArgSetFunc)NULL,
(GtkArgGetFunc)NULL,
(GtkClassInitFunc)NULL,
};
object_type = gtk_type_unique(gtk_object_get_type(),&object_info);
}
return object_type;
}
static void
gst_object_class_init (GstObjectClass *klass)
{
GtkObjectClass *gtkobject_class;
gtkobject_class = (GtkObjectClass*) klass;
parent_class = gtk_type_class (gtk_object_get_type ());
gst_object_signals[PARENT_SET] =
gtk_signal_new ("parent_set", GTK_RUN_LAST, gtkobject_class->type,
GTK_SIGNAL_OFFSET (GstObjectClass, parent_set),
gtk_marshal_NONE__POINTER, GTK_TYPE_NONE, 1,
GST_TYPE_OBJECT);
gst_object_signals[OBJECT_SAVED] =
gtk_signal_new ("object_saved", GTK_RUN_LAST, gtkobject_class->type,
GTK_SIGNAL_OFFSET (GstObjectClass, object_saved),
gtk_marshal_NONE__POINTER, GTK_TYPE_NONE, 1,
GTK_TYPE_POINTER);
gtk_object_class_add_signals (gtkobject_class, gst_object_signals, LAST_SIGNAL);
klass->path_string_separator = "/";
klass->signal_object = gtk_type_new (gst_signal_object_get_type ());
gtkobject_class->shutdown = gst_object_shutdown;
gtkobject_class->destroy = gst_object_real_destroy;
gtkobject_class->finalize = gst_object_finalize;
}
static void
gst_object_init (GstObject *object)
{
GstObjectClass *oclass;
oclass = GST_OBJECT_CLASS (GTK_OBJECT (object)->klass);
object->lock = g_mutex_new();
#ifdef HAVE_ATOMIC_H
atomic_set(&(object->refcount),1);
#else
object->refcount = 1;
#endif
object->parent = NULL;
object->flags = 0;
GST_FLAG_SET (object, GST_FLOATING);
}
/**
* gst_object_new:
*
* Create a new, empty object. Not very useful, should never be used.
*
* Returns: new object
*/
GstObject*
gst_object_new (void)
{
return GST_OBJECT (gtk_type_new (gst_object_get_type ()));
}
/**
* gst_object_ref:
* @object: GstObject to reference
*
* Increments the refence count on the object.
*
* Returns: A pointer to the object
*/
GstObject*
gst_object_ref (GstObject *object)
{
g_return_val_if_fail (GST_IS_OBJECT (object), NULL);
GST_DEBUG (GST_CAT_REFCOUNTING, "ref '%s' %d->%d\n",GST_OBJECT_NAME(object),
GTK_OBJECT(object)->ref_count,GTK_OBJECT(object)->ref_count+1);
gtk_object_ref (GTK_OBJECT (object));
return object;
}
#define gst_object_ref gst_object_ref
/**
* gst_object_unref:
* @object: GstObject to unreference
*
* Decrements the refence count on the object. If reference count hits
* zero, destroy the object.
*/
void
gst_object_unref (GstObject *object)
{
g_return_if_fail (GST_IS_OBJECT (object));
GST_DEBUG (GST_CAT_REFCOUNTING, "unref '%s' %d->%d\n",GST_OBJECT_NAME(object),
GTK_OBJECT(object)->ref_count,GTK_OBJECT(object)->ref_count-1);
gtk_object_unref (GTK_OBJECT (object));
}
#define gst_object_unref gst_object_unref
/**
* gst_object_sink:
* @object: GstObject to sink
*
* Removes floating reference on an object. Any newly created object has
* a refcount of 1 and is FLOATING. This function should be used when
* creating a new object to symbolically 'take ownership of' the object.
*/
void
gst_object_sink (GstObject *object)
{
g_return_if_fail (object != NULL);
g_return_if_fail (GST_IS_OBJECT (object));
GST_DEBUG (GST_CAT_REFCOUNTING, "sink '%s'\n",GST_OBJECT_NAME(object));
if (GST_OBJECT_FLOATING (object))
{
GST_FLAG_UNSET (object, GST_FLOATING);
gst_object_unref (object);
}
}
void
gst_object_destroy (GstObject *object)
{
g_return_if_fail (object != NULL);
g_return_if_fail (GST_IS_OBJECT (object));
GST_DEBUG (GST_CAT_REFCOUNTING, "destroy '%s'\n",GST_OBJECT_NAME(object));
if (!GST_OBJECT_DESTROYED (object))
{
/* need to hold a reference count around all class method
* invocations.
*/
gst_object_ref (object);
GTK_OBJECT (object)->klass->shutdown (GTK_OBJECT (object));
gst_object_unref (object);
}
}
static void
gst_object_shutdown (GtkObject *object)
{
GST_DEBUG (GST_CAT_REFCOUNTING, "shutdown '%s'\n",GST_OBJECT_NAME(object));
GST_FLAG_SET (GST_OBJECT (object), GST_DESTROYED);
parent_class->shutdown (GTK_OBJECT (object));
}
/* finilize is called when the object has to free its resources */
static void
gst_object_real_destroy (GtkObject *gtk_object)
{
GST_DEBUG (GST_CAT_REFCOUNTING, "destroy '%s'\n",GST_OBJECT_NAME(gtk_object));
GST_OBJECT_PARENT (gtk_object) = NULL;
parent_class->destroy (gtk_object);
}
/* finilize is called when the object has to free its resources */
static void
gst_object_finalize (GtkObject *gtk_object)
{
GstObject *object;
object = GST_OBJECT (gtk_object);
GST_DEBUG (GST_CAT_REFCOUNTING, "finalize '%s'\n",GST_OBJECT_NAME(object));
if (object->name != NULL)
g_free (object->name);
g_mutex_free (object->lock);
parent_class->finalize (gtk_object);
}
/**
* gst_object_set_name:
* @object: GstObject to set the name of
* @name: new name of object
*
* Set the name of the object.
*/
void
gst_object_set_name (GstObject *object, const gchar *name)
{
g_return_if_fail (object != NULL);
g_return_if_fail (GST_IS_OBJECT (object));
g_return_if_fail (name != NULL);
if (object->name != NULL)
g_free (object->name);
object->name = g_strdup (name);
}
/**
* gst_object_get_name:
* @object: GstObject to get the name of
*
* Get the name of the object.
*
* Returns: name of the object
*/
const gchar*
gst_object_get_name (GstObject *object)
{
g_return_val_if_fail (object != NULL, NULL);
g_return_val_if_fail (GST_IS_OBJECT (object), NULL);
return object->name;
}
/**
* gst_object_set_parent:
* @object: GstObject to set parent of
* @parent: new parent of object
*
* Set the parent of the object. The object's reference count is
* incremented.
* signals the parent-set signal
*/
void
gst_object_set_parent (GstObject *object, GstObject *parent)
{
g_return_if_fail (object != NULL);
g_return_if_fail (GST_IS_OBJECT (object));
g_return_if_fail (parent != NULL);
g_return_if_fail (GST_IS_OBJECT (parent));
g_return_if_fail (object != parent);
if (object->parent != NULL) {
GST_ERROR_OBJECT (object,object->parent, "object's parent is already set, must unparent first");
return;
}
gst_object_ref (object);
gst_object_sink (object);
object->parent = parent;
gtk_signal_emit (GTK_OBJECT (object), gst_object_signals[PARENT_SET], parent);
}
/**
* gst_object_get_parent:
* @object: GstObject to get parent of
*
* Return the parent of the object.
*
* Returns: parent of the object
*/
GstObject*
gst_object_get_parent (GstObject *object)
{
g_return_val_if_fail (object != NULL, NULL);
g_return_val_if_fail (GST_IS_OBJECT (object), NULL);
return object->parent;
}
/**
* gst_object_unparent:
* @object: GstObject to unparent
*
* Clear the parent of the object, removing the associated reference.
*/
void
gst_object_unparent (GstObject *object)
{
g_return_if_fail (object != NULL);
g_return_if_fail (GST_IS_OBJECT(object));
if (object->parent == NULL)
return;
object->parent = NULL;
gst_object_unref (object);
}
/**
* gst_object_ref:
* @object: GstObject to reference
*
* Increments the refence count on the object.
*
* Returns: Apointer to the Object
*/
#ifndef gst_object_ref
GstObject*
gst_object_ref (GstObject *object)
{
g_return_if_fail (object != NULL, NULL);
g_return_if_fail (GST_IS_OBJECT (object), NULL);
#ifdef HAVE_ATOMIC_H
g_return_if_fail (atomic_read (&(object->refcount)) > 0);
atomic_inc (&(object->refcount))
#else
g_return_if_fail (object->refcount > 0);
GST_LOCK (object);
object->refcount++;
GST_UNLOCK (object);
#endif
return object;
}
#endif /* gst_object_ref */
/**
* gst_object_unref:
* @object: GstObject to unreference
*
* Decrements the refence count on the object. If reference count hits
* zero, destroy the object.
*/
#ifndef gst_object_unref
void
gst_object_unref (GstObject *object)
{
int reftest;
g_return_if_fail (object != NULL);
g_return_if_fail (GST_IS_OBJECT (object));
#ifdef HAVE_ATOMIC_H
g_return_if_fail (atomic_read (&(object->refcount)) > 0);
reftest = atomic_dec_and_test (&(object->refcount))
#else
g_return_if_fail (object->refcount > 0);
GST_LOCK (object);
object->refcount--;
reftest = (object->refcount == 0);
GST_UNLOCK (object);
#endif
/* if we ended up with the refcount at zero */
if (reftest) {
/* get the count to 1 for gtk_object_destroy() */
#ifdef HAVE_ATOMIC_H
atomic_set (&(object->refcount),1);
#else
object->refcount = 1;
#endif
/* destroy it */
gtk_object_destroy (GTK_OBJECT (object));
/* drop the refcount back to zero */
#ifdef HAVE_ATOMIC_H
atomic_set (&(object->refcount),0);
#else
object->refcount = 0;
#endif
/* finalize the object */
// FIXME this is an evil hack that should be killed
// FIXMEFIXMEFIXMEFIXME
// gtk_object_finalize(GTK_OBJECT(object));
}
}
#endif /* gst_object_unref */
/**
* gst_object_check_uniqueness:
* @list: a list of #GstObject to check through
* @name: the name to search for
*
* This function checks through the list of objects to see if the name
* given appears in the list as the name of an object. It returns TRUE if
* the name does not exist in the list.
*
* Returns: TRUE if the name doesn't appear in the list, FALSE if it does.
*/
gboolean
gst_object_check_uniqueness (GList *list, const gchar *name)
{
GstObject *child;
while (list) {
child = GST_OBJECT (list->data);
list = g_list_next(list);
if (strcmp(GST_OBJECT_NAME(child), name) == 0) return FALSE;
}
return TRUE;
}
/**
* gst_object_save_thyself:
* @object: GstObject to save
* @parent: The parent XML node to save the object into
*
* Saves the given object into the parent XML node.
*
* Returns: the new xmlNodePtr with the saved object
*/
xmlNodePtr
gst_object_save_thyself (GstObject *object, xmlNodePtr parent)
{
GstObjectClass *oclass;
g_return_val_if_fail (object != NULL, parent);
g_return_val_if_fail (GST_IS_OBJECT (object), parent);
g_return_val_if_fail (parent != NULL, parent);
oclass = GST_OBJECT_CLASS (GTK_OBJECT (object)->klass);
if (oclass->save_thyself)
oclass->save_thyself (object, parent);
gtk_signal_emit (GTK_OBJECT (object), gst_object_signals[OBJECT_SAVED], parent);
return parent;
}
/**
* gst_object_get_path_string:
* @object: GstObject to get the path from
*
* Generates a string describing the path of the object in
* the object hierarchy. Usefull for debugging
*
* Returns: a string describing the path of the object
*/
gchar*
gst_object_get_path_string (GstObject *object)
{
GSList *parentage = NULL;
GSList *parents;
void *parent;
gchar *prevpath, *path;
const char *component;
gchar *separator = "";
gboolean free_component;
parentage = g_slist_prepend (NULL, object);
path = g_strdup ("");
// first walk the object hierarchy to build a list of the parents
do {
if (GST_IS_OBJECT (object)) {
parent = gst_object_get_parent (object);
} else {
parentage = g_slist_prepend (parentage, NULL);
parent = NULL;
}
if (parent != NULL) {
parentage = g_slist_prepend (parentage, parent);
}
object = parent;
} while (object != NULL);
// then walk the parent list and print them out
parents = parentage;
while (parents) {
if (GST_IS_OBJECT (parents->data)) {
GstObjectClass *oclass = GST_OBJECT_CLASS (GTK_OBJECT (parents->data)->klass);
component = gst_object_get_name (parents->data);
separator = oclass->path_string_separator;
free_component = FALSE;
} else {
component = g_strdup_printf("%p",parents->data);
separator = "/";
free_component = TRUE;
}
prevpath = path;
path = g_strjoin (separator, prevpath, component, NULL);
g_free(prevpath);
if (free_component)
g_free((gchar *)component);
parents = g_slist_next(parents);
}
g_slist_free (parentage);
return path;
}
struct _GstSignalObject {
GtkObject object;
};
struct _GstSignalObjectClass {
GtkObjectClass parent_class;
/* signals */
void (*object_loaded) (GstSignalObject *object, GstObject *new, xmlNodePtr self);
};
static GtkType
gst_signal_object_get_type (void)
{
static GtkType signal_object_type = 0;
if (!signal_object_type) {
static const GtkTypeInfo signal_object_info = {
"GstSignalObject",
sizeof(GstSignalObject),
sizeof(GstSignalObjectClass),
(GtkClassInitFunc)gst_signal_object_class_init,
(GtkObjectInitFunc)gst_signal_object_init,
(GtkArgSetFunc)NULL,
(GtkArgGetFunc)NULL,
(GtkClassInitFunc)NULL,
};
signal_object_type = gtk_type_unique(gtk_object_get_type(),&signal_object_info);
}
return signal_object_type;
}
static void
gst_signal_object_class_init (GstSignalObjectClass *klass)
{
GtkObjectClass *gtkobject_class;
gtkobject_class = (GtkObjectClass*) klass;
parent_class = gtk_type_class (gtk_object_get_type ());
gst_signal_object_signals[SO_OBJECT_LOADED] =
gtk_signal_new ("object_loaded", GTK_RUN_LAST, gtkobject_class->type,
GTK_SIGNAL_OFFSET (GstSignalObjectClass, object_loaded),
gtk_marshal_NONE__POINTER_POINTER, GTK_TYPE_NONE, 2,
GST_TYPE_OBJECT, GTK_TYPE_POINTER);
gtk_object_class_add_signals (gtkobject_class, gst_signal_object_signals, LAST_SIGNAL);
}
static void
gst_signal_object_init (GstSignalObject *object)
{
}
/**
* gst_class_signal_connect
* @klass: the GstObjectClass to attach the signal to
* @name: the name of the signal to attach to
* @func: the signal function
* @func_data: a pointer to user data
*
* Connect to a class signal.
*
* Returns: the signal id.
*/
guint
gst_class_signal_connect (GstObjectClass *klass,
const gchar *name,
GtkSignalFunc func,
gpointer func_data)
{
return gtk_signal_connect (klass->signal_object, name, func, func_data);
}
/**
* gst_class_signal_emit_by_name:
* @object: the object that sends the signal
* @name: the name of the signal to emit
* @self: data for the signal
*
* emits the named class signal.
*/
void
gst_class_signal_emit_by_name (GstObject *object,
const gchar *name,
xmlNodePtr self)
{
GstObjectClass *oclass;
oclass = GST_OBJECT_CLASS (GTK_OBJECT (object)->klass);
gtk_signal_emit_by_name (oclass->signal_object, name, object, self);
}