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 "gstlog.h"
/* Object signals and args */
enum {
PARENT_SET,
PARENT_UNSET,
#ifndef GST_DISABLE_LOADSAVE_REGISTRY
OBJECT_SAVED,
#endif
DEEP_NOTIFY,
LAST_SIGNAL
};
enum {
ARG_0,
ARG_NAME,
/* FILL ME */
};
enum {
SO_OBJECT_LOADED,
SO_LAST_SIGNAL
};
GType _gst_object_type = 0;
static GHashTable *object_name_counts = NULL;
G_LOCK_DEFINE_STATIC (object_name_mutex);
typedef struct _GstSignalObject GstSignalObject;
typedef struct _GstSignalObjectClass GstSignalObjectClass;
static GType gst_signal_object_get_type (void);
static void gst_signal_object_class_init (GstSignalObjectClass *klass);
static void gst_signal_object_init (GstSignalObject *object);
#ifndef GST_DISABLE_LOADSAVE_REGISTRY
static guint gst_signal_object_signals[SO_LAST_SIGNAL] = { 0 };
#endif
static void gst_object_class_init (GstObjectClass *klass);
static void gst_object_init (GstObject *object);
static void gst_object_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec);
static void gst_object_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec);
static void gst_object_dispatch_properties_changed (GObject *object,
guint n_pspecs,
GParamSpec **pspecs);
static void gst_object_dispose (GObject *object);
static void gst_object_finalize (GObject *object);
#ifndef GST_DISABLE_LOADSAVE_REGISTRY
static void gst_object_real_restore_thyself (GstObject *object, xmlNodePtr self);
#endif
static GObjectClass *parent_class = NULL;
static guint gst_object_signals[LAST_SIGNAL] = { 0 };
GType
gst_object_get_type (void)
{
if (!_gst_object_type) {
static const GTypeInfo object_info = {
sizeof (GstObjectClass),
NULL,
NULL,
(GClassInitFunc) gst_object_class_init,
NULL,
NULL,
sizeof (GstObject),
32,
(GInstanceInitFunc) gst_object_init,
NULL
};
_gst_object_type = g_type_register_static (G_TYPE_OBJECT, "GstObject", &object_info, G_TYPE_FLAG_ABSTRACT);
}
return _gst_object_type;
}
static void
gst_object_class_init (GstObjectClass *klass)
{
GObjectClass *gobject_class;
gobject_class = (GObjectClass*) klass;
parent_class = g_type_class_ref (G_TYPE_OBJECT);
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_object_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_object_get_property);
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_NAME,
g_param_spec_string ("name", "Name", "The name of the object",
NULL, G_PARAM_READWRITE));
gst_object_signals[PARENT_SET] =
g_signal_new ("parent_set", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstObjectClass, parent_set), NULL, NULL,
g_cclosure_marshal_VOID__OBJECT, G_TYPE_NONE, 1,
G_TYPE_OBJECT);
gst_object_signals[PARENT_UNSET] =
g_signal_new ("parent_unset", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstObjectClass, parent_unset), NULL, NULL,
g_cclosure_marshal_VOID__OBJECT, G_TYPE_NONE, 1,
G_TYPE_OBJECT);
#ifndef GST_DISABLE_LOADSAVE_REGISTRY
gst_object_signals[OBJECT_SAVED] =
g_signal_new ("object_saved", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstObjectClass, object_saved), NULL, NULL,
g_cclosure_marshal_VOID__POINTER, G_TYPE_NONE, 1,
G_TYPE_POINTER);
klass->restore_thyself = gst_object_real_restore_thyself;
#endif
gst_object_signals[DEEP_NOTIFY] =
g_signal_new ("deep_notify", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST | G_SIGNAL_NO_RECURSE | G_SIGNAL_DETAILED | G_SIGNAL_NO_HOOKS,
G_STRUCT_OFFSET (GstObjectClass, deep_notify), NULL, NULL,
gst_marshal_VOID__OBJECT_PARAM, G_TYPE_NONE,
2, G_TYPE_OBJECT, G_TYPE_PARAM);
klass->path_string_separator = "/";
klass->signal_object = g_object_new (gst_signal_object_get_type (), NULL);
/* see the comments at gst_element_dispatch_properties_changed */
gobject_class->dispatch_properties_changed
= GST_DEBUG_FUNCPTR (gst_object_dispatch_properties_changed);
gobject_class->dispose = gst_object_dispose;
gobject_class->finalize = gst_object_finalize;
}
static void
gst_object_init (GstObject *object)
{
object->lock = g_mutex_new();
object->parent = NULL;
object->name = NULL;
object->flags = 0;
GST_FLAG_SET (object, GST_FLOATING);
}
/**
* 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 %p '%s' %d->%d", object,
GST_OBJECT_NAME (object),
G_OBJECT (object)->ref_count,
G_OBJECT (object)->ref_count + 1);
g_object_ref (G_OBJECT (object));
return object;
}
/**
* 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));
g_return_if_fail (G_OBJECT (object)->ref_count > 0);
GST_DEBUG (GST_CAT_REFCOUNTING, "unref %p '%s' %d->%d", object,
GST_OBJECT_NAME (object),
G_OBJECT (object)->ref_count,
G_OBJECT (object)->ref_count - 1);
g_object_unref (G_OBJECT (object));
}
/**
* 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.
* Use #gst_object_set_parent to have this done for you.
*/
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 %p '%s'", object, GST_OBJECT_NAME (object));
if (GST_OBJECT_FLOATING (object)) {
GST_FLAG_UNSET (object, GST_FLOATING);
gst_object_unref (object);
}
}
/**
* gst_object_replace:
* @oldobj: pointer to place of old GstObject
* @newobj: new GstObject
*
* Unrefs the object pointer to by oldobj, refs the newobj and
* puts the newobj in *oldobj.
*/
void
gst_object_replace (GstObject **oldobj, GstObject *newobj)
{
GST_DEBUG (GST_CAT_REFCOUNTING, "replace %p %p", *oldobj, newobj);
if (*oldobj != newobj) {
if (newobj) gst_object_ref (newobj);
if (*oldobj) gst_object_unref (*oldobj);
*oldobj = newobj;
}
}
static void
gst_object_dispose (GObject *object)
{
GST_DEBUG (GST_CAT_REFCOUNTING, "dispose %p '%s'", object, GST_OBJECT_NAME (object));
GST_FLAG_SET (GST_OBJECT (object), GST_DESTROYED);
GST_OBJECT_PARENT (object) = NULL;
parent_class->dispose (object);
}
/* finilize is called when the object has to free its resources */
static void
gst_object_finalize (GObject *object)
{
GstObject *gstobject = GST_OBJECT (object);
GST_DEBUG (GST_CAT_REFCOUNTING, "finalize %p '%s'", object, GST_OBJECT_NAME (object));
g_signal_handlers_destroy (object);
if (gstobject->name != NULL)
g_free (gstobject->name);
g_mutex_free (gstobject->lock);
parent_class->finalize (object);
}
/* Changing a GObject property of an element will result in "deep_notify"
* signals being emitted by the element itself, as well as in each parent
* element. This is so that an application can connect a listener to the
* top-level bin to catch property-change notifications for all contained
* elements. */
static void
gst_object_dispatch_properties_changed (GObject *object,
guint n_pspecs,
GParamSpec **pspecs)
{
GstObject *gst_object;
guint i;
/* do the standard dispatching */
G_OBJECT_CLASS (parent_class)->dispatch_properties_changed (object, n_pspecs, pspecs);
/* now let the parent dispatch those, too */
gst_object = GST_OBJECT_PARENT (object);
while (gst_object) {
/* need own category? */
for (i = 0; i < n_pspecs; i++) {
GST_DEBUG (GST_CAT_EVENT, "deep notification from %s to %s (%s)", GST_OBJECT_NAME (object),
GST_OBJECT_NAME (gst_object), pspecs[i]->name);
g_signal_emit (gst_object, gst_object_signals[DEEP_NOTIFY], g_quark_from_string (pspecs[i]->name),
(GstObject *) object, pspecs[i]);
}
gst_object = GST_OBJECT_PARENT (gst_object);
}
}
/**
* gst_object_default_deep_notify:
* @object: the #GObject that signalled the notify.
* @orig: a #GstObject that initiated the notify.
* @pspec: a #GParamSpec of the property.
* @excluded_props: a set of user-specified properties to exclude or
* NULL to show all changes.
*
* Adds a default deep_notify signal callback to an
* element. The user data should contain a pointer to an array of
* strings that should be excluded from the notify.
* The default handler will print the new value of the property
* using g_print.
*/
void
gst_object_default_deep_notify (GObject *object, GstObject *orig,
GParamSpec *pspec, gchar **excluded_props)
{
GValue value = { 0, }; /* the important thing is that value.type = 0 */
gchar *str = 0;
gchar *name = NULL;
if (pspec->flags & G_PARAM_READABLE) {
/* let's not print these out for excluded properties... */
while (excluded_props != NULL && *excluded_props != NULL) {
if (strcmp (pspec->name, *excluded_props) == 0)
return;
excluded_props++;
}
g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (pspec));
g_object_get_property (G_OBJECT (orig), pspec->name, &value);
if (G_IS_PARAM_SPEC_ENUM (pspec)) {
GEnumValue *enum_value;
enum_value = g_enum_get_value (G_ENUM_CLASS (g_type_class_ref (pspec->value_type)),
g_value_get_enum (&value));
str = g_strdup_printf ("%s (%d)", enum_value->value_nick,
enum_value->value);
}
else {
str = g_strdup_value_contents (&value);
}
name = gst_object_get_path_string (orig);
g_print ("%s: %s = %s\n", name, pspec->name, str);
g_free (name);
g_free (str);
g_value_unset (&value);
} else {
name = gst_object_get_path_string (orig);
g_warning ("Parameter %s not readable in %s.",
pspec->name, name);
g_free (name);
}
}
static void
gst_object_set_name_default (GstObject *object)
{
gint count;
gchar *name, *tmp;
const gchar *type_name;
type_name = G_OBJECT_TYPE_NAME (object);
/* to ensure guaranteed uniqueness across threads, only one thread
* may ever assign a name */
G_LOCK (object_name_mutex);
if (!object_name_counts)
object_name_counts = g_hash_table_new (g_str_hash, g_str_equal);
count = GPOINTER_TO_INT (g_hash_table_lookup (object_name_counts, type_name));
g_hash_table_insert (object_name_counts, g_strdup (type_name),
GINT_TO_POINTER (count + 1));
G_UNLOCK (object_name_mutex);
/* GstFooSink -> foosinkN */
if (strncmp (type_name, "Gst", 3) == 0)
type_name += 3;
tmp = g_strdup_printf ("%s%d", type_name, count);
name = g_ascii_strdown (tmp, strlen (tmp));
g_free (tmp);
gst_object_set_name (object, name);
g_free (name);
}
/**
* gst_object_set_name:
* @object: GstObject to set the name of
* @name: new name of object
*
* Sets the name of the object, or gives the element a guaranteed unique
* name (if @name is NULL).
*/
void
gst_object_set_name (GstObject *object, const gchar *name)
{
g_return_if_fail (object != NULL);
g_return_if_fail (GST_IS_OBJECT (object));
if (object->name != NULL)
g_free (object->name);
if (name != NULL)
object->name = g_strdup (name);
else
gst_object_set_name_default (object);
}
/**
* 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 (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;
g_signal_emit (G_OBJECT (object), gst_object_signals[PARENT_SET], 0, 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;
GST_DEBUG (GST_CAT_REFCOUNTING, "unparent '%s'",GST_OBJECT_NAME(object));
g_signal_emit (G_OBJECT (object), gst_object_signals[PARENT_UNSET], 0, object->parent);
object->parent = NULL;
gst_object_unref (object);
}
/**
* 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)
{
g_return_val_if_fail (name != NULL, FALSE);
while (list) {
GstObject *child = GST_OBJECT (list->data);
list = g_list_next (list);
if (strcmp (GST_OBJECT_NAME (child), name) == 0)
return FALSE;
}
return TRUE;
}
#ifndef GST_DISABLE_LOADSAVE_REGISTRY
/**
* 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_GET_CLASS (object);
if (oclass->save_thyself)
oclass->save_thyself (object, parent);
g_signal_emit (G_OBJECT (object), gst_object_signals[OBJECT_SAVED], 0, parent);
return parent;
}
/**
* gst_object_restore_thyself:
* @object: GstObject to load into
* @self: The XML node to load the object from
*
* Restores the given object with the data from the parent XML node.
*/
void
gst_object_restore_thyself (GstObject *object, xmlNodePtr self)
{
GstObjectClass *oclass;
g_return_if_fail (object != NULL);
g_return_if_fail (GST_IS_OBJECT (object));
g_return_if_fail (self != NULL);
oclass = GST_OBJECT_GET_CLASS (object);
if (oclass->restore_thyself)
oclass->restore_thyself (object, self);
}
static void
gst_object_real_restore_thyself (GstObject *object, xmlNodePtr self)
{
g_return_if_fail (object != NULL);
g_return_if_fail (GST_IS_OBJECT (object));
g_return_if_fail (self != NULL);
/* FIXME: the signalobject stuff doesn't work
* gst_class_signal_emit_by_name (object, "object_loaded", self); */
}
#endif /* GST_DISABLE_LOADSAVE_REGISTRY */
static void
gst_object_set_property (GObject* object, guint prop_id,
const GValue* value, GParamSpec* pspec)
{
GstObject *gstobject;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_OBJECT (object));
gstobject = GST_OBJECT (object);
switch (prop_id) {
case ARG_NAME:
gst_object_set_name (gstobject, g_value_get_string (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_object_get_property (GObject* object, guint prop_id,
GValue* value, GParamSpec* pspec)
{
GstObject *gstobject;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_OBJECT (object));
gstobject = GST_OBJECT (object);
switch (prop_id) {
case ARG_NAME:
g_value_set_string (value, (gchar*)GST_OBJECT_NAME (gstobject));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/**
* 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. Only useful (or used) 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_GET_CLASS (parents->data);
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 {
GObject object;
};
struct _GstSignalObjectClass {
GObjectClass parent_class;
/* signals */
#ifndef GST_DISABLE_LOADSAVE_REGISTRY
void (*object_loaded) (GstSignalObject *object, GstObject *new, xmlNodePtr self);
#endif /* GST_DISABLE_LOADSAVE_REGISTRY */
};
static GType
gst_signal_object_get_type (void)
{
static GType signal_object_type = 0;
if (!signal_object_type) {
static const GTypeInfo signal_object_info = {
sizeof(GstSignalObjectClass),
NULL,
NULL,
(GClassInitFunc)gst_signal_object_class_init,
NULL,
NULL,
sizeof(GstSignalObject),
16,
(GInstanceInitFunc)gst_signal_object_init,
NULL
};
signal_object_type = g_type_register_static(G_TYPE_OBJECT, "GstSignalObject", &signal_object_info, 0);
}
return signal_object_type;
}
static void
gst_signal_object_class_init (GstSignalObjectClass *klass)
{
GObjectClass *gobject_class;
gobject_class = (GObjectClass*) klass;
parent_class = g_type_class_ref (G_TYPE_OBJECT);
#ifndef GST_DISABLE_LOADSAVE_REGISTRY
gst_signal_object_signals[SO_OBJECT_LOADED] =
g_signal_new ("object_loaded", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstObjectClass, parent_set), NULL, NULL,
gst_marshal_VOID__OBJECT_POINTER, G_TYPE_NONE, 2,
G_TYPE_OBJECT, G_TYPE_POINTER);
#endif
}
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,
gpointer func,
gpointer func_data)
{
return g_signal_connect (klass->signal_object, name, func, func_data);
}
#ifndef GST_DISABLE_LOADSAVE_REGISTRY
/**
* 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_GET_CLASS (object);
g_signal_emit_by_name (oclass->signal_object, name, object, self);
}
#endif /* GST_DISABLE_LOADSAVE_REGISTRY */