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"
#include "gstpad.h"
#include "gstelement.h"
/* Object signals and args */
enum {
PARENT_SET,
LAST_SIGNAL
};
enum {
ARG_0,
/* FILL ME */
};
static void gst_object_class_init(GstObjectClass *klass);
static void gst_object_init(GstObject *object);
static GtkObjectClass *parent_class = NULL;
static guint gst_object_signals[LAST_SIGNAL] = { 0 };
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);
gtk_object_class_add_signals(gtkobject_class,gst_object_signals,LAST_SIGNAL);
}
static void gst_object_init(GstObject *object) {
object->lock = g_mutex_new();
#ifdef HAVE_ATOMIC_H
atomic_set(&(object->refcount),1);
#else
object->refcount++;
#endif
object->parent = NULL;
}
/**
* gst_object_new:
*
* Create a new, empty object. Not very useful, should never be used.
*
* Returns: new object
*/
GstObject *gst_object_new() {
return GST_OBJECT(gtk_type_new(gst_object_get_type()));
}
/**
* 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.
*/
#ifndef gst_object_ref
void gst_object_ref (GstObject *object) {
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);
atomic_inc(&(object->refcount))
#else
g_return_if_fail(object->refcount > 0);
GST_LOCK(object);
object->refcount++;
GST_UNLOCK(object);
#endif
}
#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_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.
*/
#ifndef gst_object_sink
void gst_object_sink(GstObject *object) {
g_return_if_fail(object != NULL);
g_return_if_fail(GST_IS_OBJECT(object));
if (GTK_OBJECT_FLOATING(object)) {
GTK_OBJECT_UNSET_FLAGS(object, GTK_FLOATING);
gst_object_unref(object);
}
}
#endif /* gst_object_sink */
/**
* 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);
// first walk the object hierarchy to build a list of the parents
do {
if (GST_IS_OBJECT(object)) {
if (GST_IS_PAD(object)) {
parent = GST_PAD(object)->parent;
// } else if (GST_IS_ELEMENT(object)) {
// parent = gst_element_get_parent(GST_ELEMENT(object));
} else {
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)) {
if (GST_IS_PAD(parents->data)) {
component = gst_pad_get_name(GST_PAD(parents->data));
separator = ".";
free_component = FALSE;
} else if (GST_IS_ELEMENT(parents->data)) {
component = gst_element_get_name(GST_ELEMENT(parents->data));
separator = "/";
free_component = FALSE;
} else {
// component = g_strdup_printf("a %s",gtk_type_name(gtk_identifier_get_type(parents->data)));
component = g_strdup_printf("unknown%p",parents->data);
separator = "/";
free_component = TRUE;
}
} 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;
}