2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wtay@chello.be>
5 * gstobject.c: Fundamental class used for all of GStreamer
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
23 #include "gst_private.h"
25 #include "gstobject.h"
28 /* Object signals and args */
32 #ifndef GST_DISABLE_LOADSAVE_REGISTRY
50 GType _gst_object_type = 0;
51 static GHashTable *object_name_counts = NULL;
52 G_LOCK_DEFINE_STATIC (object_name_mutex);
54 typedef struct _GstSignalObject GstSignalObject;
55 typedef struct _GstSignalObjectClass GstSignalObjectClass;
57 static GType gst_signal_object_get_type (void);
58 static void gst_signal_object_class_init (GstSignalObjectClass *klass);
59 static void gst_signal_object_init (GstSignalObject *object);
61 static guint gst_signal_object_signals[SO_LAST_SIGNAL] = { 0 };
63 static void gst_object_class_init (GstObjectClass *klass);
64 static void gst_object_init (GstObject *object);
66 static void gst_object_set_property (GObject * object, guint prop_id, const GValue * value,
68 static void gst_object_get_property (GObject * object, guint prop_id, GValue * value,
70 static void gst_object_dispatch_properties_changed (GObject *object,
74 static void gst_object_dispose (GObject *object);
75 static void gst_object_finalize (GObject *object);
77 #ifndef GST_DISABLE_LOADSAVE_REGISTRY
78 static void gst_object_real_restore_thyself (GstObject *object, xmlNodePtr self);
81 static GObjectClass *parent_class = NULL;
82 static guint gst_object_signals[LAST_SIGNAL] = { 0 };
85 gst_object_get_type (void)
87 if (!_gst_object_type) {
88 static const GTypeInfo object_info = {
89 sizeof (GstObjectClass),
92 (GClassInitFunc) gst_object_class_init,
97 (GInstanceInitFunc) gst_object_init,
100 _gst_object_type = g_type_register_static (G_TYPE_OBJECT, "GstObject", &object_info, G_TYPE_FLAG_ABSTRACT);
102 return _gst_object_type;
106 gst_object_class_init (GstObjectClass *klass)
108 GObjectClass *gobject_class;
110 gobject_class = (GObjectClass*) klass;
112 parent_class = g_type_class_ref (G_TYPE_OBJECT);
114 gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_object_set_property);
115 gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_object_get_property);
117 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_NAME,
118 g_param_spec_string ("name", "Name", "The name of the object",
119 NULL, G_PARAM_READWRITE));
121 gst_object_signals[PARENT_SET] =
122 g_signal_new ("parent_set", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
123 G_STRUCT_OFFSET (GstObjectClass, parent_set), NULL, NULL,
124 g_cclosure_marshal_VOID__OBJECT, G_TYPE_NONE, 1,
126 gst_object_signals[PARENT_UNSET] =
127 g_signal_new ("parent_unset", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
128 G_STRUCT_OFFSET (GstObjectClass, parent_unset), NULL, NULL,
129 g_cclosure_marshal_VOID__OBJECT, G_TYPE_NONE, 1,
131 #ifndef GST_DISABLE_LOADSAVE_REGISTRY
132 gst_object_signals[OBJECT_SAVED] =
133 g_signal_new ("object_saved", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
134 G_STRUCT_OFFSET (GstObjectClass, object_saved), NULL, NULL,
135 g_cclosure_marshal_VOID__POINTER, G_TYPE_NONE, 1,
138 klass->restore_thyself = gst_object_real_restore_thyself;
140 gst_object_signals[DEEP_NOTIFY] =
141 g_signal_new ("deep_notify", G_TYPE_FROM_CLASS (klass),
142 G_SIGNAL_RUN_FIRST | G_SIGNAL_NO_RECURSE | G_SIGNAL_DETAILED | G_SIGNAL_NO_HOOKS,
143 G_STRUCT_OFFSET (GstObjectClass, deep_notify), NULL, NULL,
144 gst_marshal_VOID__OBJECT_PARAM, G_TYPE_NONE,
145 2, G_TYPE_OBJECT, G_TYPE_PARAM);
147 klass->path_string_separator = "/";
149 klass->signal_object = g_object_new (gst_signal_object_get_type (), NULL);
151 /* see the comments at gst_element_dispatch_properties_changed */
152 gobject_class->dispatch_properties_changed
153 = GST_DEBUG_FUNCPTR (gst_object_dispatch_properties_changed);
155 gobject_class->dispose = gst_object_dispose;
156 gobject_class->finalize = gst_object_finalize;
160 gst_object_init (GstObject *object)
162 object->lock = g_mutex_new();
163 object->parent = NULL;
167 GST_FLAG_SET (object, GST_FLOATING);
172 * @object: GstObject to reference
174 * Increments the refence count on the object.
176 * Returns: A pointer to the object
179 gst_object_ref (GstObject *object)
181 g_return_val_if_fail (GST_IS_OBJECT (object), NULL);
183 GST_DEBUG (GST_CAT_REFCOUNTING, "ref '%s' %d->%d",GST_OBJECT_NAME(object),
184 G_OBJECT(object)->ref_count,G_OBJECT(object)->ref_count+1);
186 g_object_ref (G_OBJECT (object));
192 * @object: GstObject to unreference
194 * Decrements the refence count on the object. If reference count hits
195 * zero, destroy the object.
198 gst_object_unref (GstObject *object)
200 g_return_if_fail (GST_IS_OBJECT (object));
202 GST_DEBUG (GST_CAT_REFCOUNTING, "unref '%s' %d->%d",GST_OBJECT_NAME(object),
203 G_OBJECT(object)->ref_count,G_OBJECT(object)->ref_count-1);
205 g_object_unref (G_OBJECT (object));
210 * @object: GstObject to sink
212 * Removes floating reference on an object. Any newly created object has
213 * a refcount of 1 and is FLOATING. This function should be used when
214 * creating a new object to symbolically 'take ownership of' the object.
215 * Use #gst_object_set_parent to have this done for you.
218 gst_object_sink (GstObject *object)
220 g_return_if_fail (object != NULL);
221 g_return_if_fail (GST_IS_OBJECT (object));
223 GST_DEBUG (GST_CAT_REFCOUNTING, "sink '%s'",GST_OBJECT_NAME(object));
224 if (GST_OBJECT_FLOATING (object))
226 GST_FLAG_UNSET (object, GST_FLOATING);
227 gst_object_unref (object);
233 * @oldobj: pointer to place of old GstObject
234 * @newobj: new GstObject
236 * Unrefs the object pointer to by oldobj, refs the newobj and
237 * puts the newobj in *oldobj.
240 gst_object_swap (GstObject **oldobj, GstObject *newobj)
242 if (*oldobj != newobj) {
244 gst_object_ref (newobj);
246 gst_object_unref (*oldobj);
253 * gst_object_destroy:
254 * @object: GstObject to destroy
256 * Destroy the object.
260 gst_object_destroy (GstObject *object)
262 g_return_if_fail (object != NULL);
263 g_return_if_fail (GST_IS_OBJECT (object));
265 GST_DEBUG (GST_CAT_REFCOUNTING, "destroy '%s'",GST_OBJECT_NAME(object));
266 if (!GST_OBJECT_DESTROYED (object))
268 /* need to hold a reference count around all class method
271 g_object_run_dispose (G_OBJECT (object));
276 gst_object_dispose (GObject *object)
278 GST_DEBUG (GST_CAT_REFCOUNTING, "dispose '%s'",GST_OBJECT_NAME(object));
279 GST_FLAG_SET (GST_OBJECT (object), GST_DESTROYED);
280 GST_OBJECT_PARENT (object) = NULL;
282 parent_class->dispose (object);
285 /* finilize is called when the object has to free its resources */
287 gst_object_finalize (GObject *object)
289 GstObject *gstobject = GST_OBJECT (object);
291 GST_DEBUG (GST_CAT_REFCOUNTING, "finalize '%s'",GST_OBJECT_NAME(object));
293 g_signal_handlers_destroy (object);
295 if (gstobject->name != NULL)
296 g_free (gstobject->name);
298 g_mutex_free (gstobject->lock);
300 parent_class->finalize (object);
303 /* Changing a GObject property of an element will result in "deep_notify"
304 * signals being emitted by the element itself, as well as in each parent
305 * element. This is so that an application can connect a listener to the
306 * top-level bin to catch property-change notifications for all contained
309 gst_object_dispatch_properties_changed (GObject *object,
313 GstObject *gst_object;
316 /* do the standard dispatching */
317 G_OBJECT_CLASS (parent_class)->dispatch_properties_changed (object, n_pspecs, pspecs);
319 /* now let the parent dispatch those, too */
320 gst_object = GST_OBJECT_PARENT (object);
322 /* need own category? */
323 for (i = 0; i < n_pspecs; i++) {
324 GST_DEBUG (GST_CAT_EVENT, "deep notification from %s to %s (%s)", GST_OBJECT_NAME (object),
325 GST_OBJECT_NAME (gst_object), pspecs[i]->name);
326 g_signal_emit (gst_object, gst_object_signals[DEEP_NOTIFY], g_quark_from_string (pspecs[i]->name),
327 (GstObject *) object, pspecs[i]);
330 gst_object = GST_OBJECT_PARENT (gst_object);
335 * gst_object_default_deep_notify:
336 * @object: the #GObject that signalled the notify.
337 * @orig: a #GstObject that initiated the notify.
338 * @pspec: a #GParamSpec of the property.
339 * @excluded_props: a set of user-specified properties to exclude or
340 * NULL to show all changes.
342 * Adds a default deep_notify signal callback to an
343 * element. The user data should contain a pointer to an array of
344 * strings that should be excluded from the notify.
345 * The default handler will print the new value of the property
349 gst_object_default_deep_notify (GObject *object, GstObject *orig,
350 GParamSpec *pspec, gchar **excluded_props)
352 GValue value = { 0, }; /* the important thing is that value.type = 0 */
356 if (pspec->flags & G_PARAM_READABLE) {
357 /* let's not print these out for excluded properties... */
358 while (excluded_props != NULL && *excluded_props != NULL) {
359 if (strcmp (pspec->name, *excluded_props) == 0)
363 g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (pspec));
364 g_object_get_property (G_OBJECT (orig), pspec->name, &value);
366 if (G_IS_PARAM_SPEC_ENUM (pspec)) {
367 GEnumValue *enum_value;
368 enum_value = g_enum_get_value (G_ENUM_CLASS (g_type_class_ref (pspec->value_type)),
369 g_value_get_enum (&value));
371 str = g_strdup_printf ("%s (%d)", enum_value->value_nick,
375 str = g_strdup_value_contents (&value);
377 name = gst_object_get_path_string (orig);
378 g_print ("%s: %s = %s\n", name, pspec->name, str);
381 g_value_unset (&value);
383 name = gst_object_get_path_string (orig);
384 g_warning ("Parameter %s not readable in %s.",
391 gst_object_set_name_default (GstObject *object)
395 const gchar *type_name;
397 type_name = G_OBJECT_TYPE_NAME (object);
399 /* to ensure guaranteed uniqueness across threads, only one thread
400 * may ever assign a name */
401 G_LOCK (object_name_mutex);
403 if (!object_name_counts)
404 object_name_counts = g_hash_table_new (g_str_hash, g_str_equal);
406 count = GPOINTER_TO_INT (g_hash_table_lookup (object_name_counts, type_name));
407 g_hash_table_insert (object_name_counts, g_strdup (type_name),
408 GINT_TO_POINTER (count + 1));
410 G_UNLOCK (object_name_mutex);
412 /* GstFooSink -> foosinkN */
413 if (strncmp (type_name, "Gst", 3) == 0)
415 tmp = g_strdup_printf ("%s%d", type_name, count);
416 name = g_ascii_strdown (tmp, strlen (tmp));
419 gst_object_set_name (object, name);
424 * gst_object_set_name:
425 * @object: GstObject to set the name of
426 * @name: new name of object
428 * Sets the name of the object, or gives the element a guaranteed unique
429 * name (if @name is NULL).
432 gst_object_set_name (GstObject *object, const gchar *name)
434 g_return_if_fail (object != NULL);
435 g_return_if_fail (GST_IS_OBJECT (object));
437 if (object->name != NULL)
438 g_free (object->name);
441 object->name = g_strdup (name);
443 gst_object_set_name_default (object);
447 * gst_object_get_name:
448 * @object: GstObject to get the name of
450 * Get the name of the object.
452 * Returns: name of the object
455 gst_object_get_name (GstObject *object)
457 g_return_val_if_fail (GST_IS_OBJECT (object), NULL);
463 * gst_object_set_parent:
464 * @object: GstObject to set parent of
465 * @parent: new parent of object
467 * Set the parent of the object. The object's reference count is
469 * signals the parent-set signal
472 gst_object_set_parent (GstObject *object, GstObject *parent)
474 g_return_if_fail (object != NULL);
475 g_return_if_fail (GST_IS_OBJECT (object));
476 g_return_if_fail (parent != NULL);
477 g_return_if_fail (GST_IS_OBJECT (parent));
478 g_return_if_fail (object != parent);
480 if (object->parent != NULL) {
481 GST_ERROR_OBJECT (object,object->parent, "object's parent is already set, must unparent first");
485 gst_object_ref (object);
486 gst_object_sink (object);
487 object->parent = parent;
489 g_signal_emit (G_OBJECT (object), gst_object_signals[PARENT_SET], 0, parent);
493 * gst_object_get_parent:
494 * @object: GstObject to get parent of
496 * Return the parent of the object.
498 * Returns: parent of the object
501 gst_object_get_parent (GstObject *object)
503 g_return_val_if_fail (object != NULL, NULL);
504 g_return_val_if_fail (GST_IS_OBJECT (object), NULL);
506 return object->parent;
510 * gst_object_unparent:
511 * @object: GstObject to unparent
513 * Clear the parent of the object, removing the associated reference.
516 gst_object_unparent (GstObject *object)
518 g_return_if_fail (object != NULL);
519 g_return_if_fail (GST_IS_OBJECT(object));
520 if (object->parent == NULL)
523 GST_DEBUG (GST_CAT_REFCOUNTING, "unparent '%s'",GST_OBJECT_NAME(object));
525 g_signal_emit (G_OBJECT (object), gst_object_signals[PARENT_UNSET], 0, object->parent);
527 object->parent = NULL;
528 gst_object_unref (object);
532 * gst_object_check_uniqueness:
533 * @list: a list of #GstObject to check through
534 * @name: the name to search for
536 * This function checks through the list of objects to see if the name
537 * given appears in the list as the name of an object. It returns TRUE if
538 * the name does not exist in the list.
540 * Returns: TRUE if the name doesn't appear in the list, FALSE if it does.
543 gst_object_check_uniqueness (GList *list, const gchar *name)
545 g_return_val_if_fail (name != NULL, FALSE);
548 GstObject *child = GST_OBJECT (list->data);
550 list = g_list_next (list);
552 if (strcmp (GST_OBJECT_NAME (child), name) == 0)
560 #ifndef GST_DISABLE_LOADSAVE_REGISTRY
562 * gst_object_save_thyself:
563 * @object: GstObject to save
564 * @parent: The parent XML node to save the object into
566 * Saves the given object into the parent XML node.
568 * Returns: the new xmlNodePtr with the saved object
571 gst_object_save_thyself (GstObject *object, xmlNodePtr parent)
573 GstObjectClass *oclass;
575 g_return_val_if_fail (object != NULL, parent);
576 g_return_val_if_fail (GST_IS_OBJECT (object), parent);
577 g_return_val_if_fail (parent != NULL, parent);
579 oclass = GST_OBJECT_GET_CLASS (object);
581 if (oclass->save_thyself)
582 oclass->save_thyself (object, parent);
584 g_signal_emit (G_OBJECT (object), gst_object_signals[OBJECT_SAVED], 0, parent);
590 * gst_object_restore_thyself:
591 * @object: GstObject to load into
592 * @self: The XML node to load the object from
594 * Restores the given object with the data from the parent XML node.
597 gst_object_restore_thyself (GstObject *object, xmlNodePtr self)
599 GstObjectClass *oclass;
601 g_return_if_fail (object != NULL);
602 g_return_if_fail (GST_IS_OBJECT (object));
603 g_return_if_fail (self != NULL);
605 oclass = GST_OBJECT_GET_CLASS (object);
607 if (oclass->restore_thyself)
608 oclass->restore_thyself (object, self);
612 gst_object_real_restore_thyself (GstObject *object, xmlNodePtr self)
614 g_return_if_fail (object != NULL);
615 g_return_if_fail (GST_IS_OBJECT (object));
616 g_return_if_fail (self != NULL);
618 /* FIXME: the signalobject stuff doesn't work
619 * gst_class_signal_emit_by_name (object, "object_loaded", self); */
621 #endif /* GST_DISABLE_LOADSAVE_REGISTRY */
624 gst_object_set_property (GObject* object, guint prop_id,
625 const GValue* value, GParamSpec* pspec)
627 GstObject *gstobject;
629 /* it's not null if we got it, but it might not be ours */
630 g_return_if_fail (GST_IS_OBJECT (object));
632 gstobject = GST_OBJECT (object);
636 gst_object_set_name (gstobject, g_value_get_string (value));
639 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
645 gst_object_get_property (GObject* object, guint prop_id,
646 GValue* value, GParamSpec* pspec)
648 GstObject *gstobject;
650 /* it's not null if we got it, but it might not be ours */
651 g_return_if_fail (GST_IS_OBJECT (object));
653 gstobject = GST_OBJECT (object);
657 g_value_set_string (value, (gchar*)GST_OBJECT_NAME (gstobject));
660 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
666 * gst_object_get_path_string:
667 * @object: GstObject to get the path from
669 * Generates a string describing the path of the object in
670 * the object hierarchy. Only useful (or used) for debugging
672 * Returns: a string describing the path of the object
675 gst_object_get_path_string (GstObject *object)
677 GSList *parentage = NULL;
680 gchar *prevpath, *path;
681 const char *component;
682 gchar *separator = "";
683 gboolean free_component;
685 parentage = g_slist_prepend (NULL, object);
687 path = g_strdup ("");
689 /* first walk the object hierarchy to build a list of the parents */
691 if (GST_IS_OBJECT (object)) {
692 parent = gst_object_get_parent (object);
694 parentage = g_slist_prepend (parentage, NULL);
698 if (parent != NULL) {
699 parentage = g_slist_prepend (parentage, parent);
703 } while (object != NULL);
705 /* then walk the parent list and print them out */
708 if (GST_IS_OBJECT (parents->data)) {
709 GstObjectClass *oclass = GST_OBJECT_GET_CLASS (parents->data);
711 component = gst_object_get_name (parents->data);
712 separator = oclass->path_string_separator;
713 free_component = FALSE;
715 component = g_strdup_printf("%p",parents->data);
717 free_component = TRUE;
721 path = g_strjoin (separator, prevpath, component, NULL);
724 g_free((gchar *)component);
726 parents = g_slist_next(parents);
729 g_slist_free (parentage);
736 struct _GstSignalObject {
740 struct _GstSignalObjectClass {
741 GObjectClass parent_class;
744 #ifndef GST_DISABLE_LOADSAVE_REGISTRY
745 void (*object_loaded) (GstSignalObject *object, GstObject *new, xmlNodePtr self);
746 #endif /* GST_DISABLE_LOADSAVE_REGISTRY */
750 gst_signal_object_get_type (void)
752 static GType signal_object_type = 0;
754 if (!signal_object_type) {
755 static const GTypeInfo signal_object_info = {
756 sizeof(GstSignalObjectClass),
759 (GClassInitFunc)gst_signal_object_class_init,
762 sizeof(GstSignalObject),
764 (GInstanceInitFunc)gst_signal_object_init,
767 signal_object_type = g_type_register_static(G_TYPE_OBJECT, "GstSignalObject", &signal_object_info, 0);
769 return signal_object_type;
773 gst_signal_object_class_init (GstSignalObjectClass *klass)
775 GObjectClass *gobject_class;
777 gobject_class = (GObjectClass*) klass;
779 parent_class = g_type_class_ref (G_TYPE_OBJECT);
781 #ifndef GST_DISABLE_LOADSAVE_REGISTRY
782 gst_signal_object_signals[SO_OBJECT_LOADED] =
783 g_signal_new ("object_loaded", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
784 G_STRUCT_OFFSET (GstObjectClass, parent_set), NULL, NULL,
785 gst_marshal_VOID__OBJECT_POINTER, G_TYPE_NONE, 2,
786 G_TYPE_OBJECT, G_TYPE_POINTER);
791 gst_signal_object_init (GstSignalObject *object)
796 * gst_class_signal_connect
797 * @klass: the GstObjectClass to attach the signal to
798 * @name: the name of the signal to attach to
799 * @func: the signal function
800 * @func_data: a pointer to user data
802 * Connect to a class signal.
804 * Returns: the signal id.
807 gst_class_signal_connect (GstObjectClass *klass,
812 return g_signal_connect (klass->signal_object, name, func, func_data);
815 #ifndef GST_DISABLE_LOADSAVE_REGISTRY
817 * gst_class_signal_emit_by_name:
818 * @object: the object that sends the signal
819 * @name: the name of the signal to emit
820 * @self: data for the signal
822 * emits the named class signal.
825 gst_class_signal_emit_by_name (GstObject *object,
829 GstObjectClass *oclass;
831 oclass = GST_OBJECT_GET_CLASS (object);
833 g_signal_emit_by_name (oclass->signal_object, name, object, self);
836 #endif /* GST_DISABLE_LOADSAVE_REGISTRY */