*
* #GstObject provides a root for the object hierarchy tree filed in by the
* GStreamer library. It is currently a thin wrapper on top of
- * #GObject. It is an abstract class that is not very usable on its own.
+ * #GInitiallyUnowned. It is an abstract class that is not very usable on its own.
*
* #GstObject gives us basic refcounting, parenting functionality and locking.
* Most of the function are just extended for special GStreamer needs and can be
* found under the same name in the base class of #GstObject which is #GObject
* (e.g. g_object_ref() becomes gst_object_ref()).
*
- * The most interesting difference between #GstObject and #GObject is the
- * "floating" reference count. A #GObject is created with a reference count of
- * 1, owned by the creator of the #GObject. (The owner of a reference is the
- * code section that has the right to call gst_object_unref() in order to
- * remove that reference.) A #GstObject is created with a reference count of 1
- * also, but it isn't owned by anyone; Instead, the initial reference count
- * of a #GstObject is "floating". The floating reference can be removed by
- * anyone at any time, by calling gst_object_sink(). gst_object_sink() does
- * nothing if an object is already sunk (has no floating reference).
- *
- * When you add a #GstElement to its parent container, the parent container will
- * do this:
- * <informalexample>
- * <programlisting>
- * gst_object_ref (GST_OBJECT (child_element));
- * gst_object_sink (GST_OBJECT (child_element));
- * </programlisting>
- * </informalexample>
- * This means that the container now owns a reference to the child element
- * (since it called gst_object_ref()), and the child element has no floating
- * reference.
- *
- * The purpose of the floating reference is to keep the child element alive
- * until you add it to a parent container, which then manages the lifetime of
- * the object itself:
- * <informalexample>
- * <programlisting>
- * element = gst_element_factory_make (factoryname, name);
- * // element has one floating reference to keep it alive
- * gst_bin_add (GST_BIN (bin), element);
- * // element has one non-floating reference owned by the container
- * </programlisting>
- * </informalexample>
- *
- * Another effect of this is, that calling gst_object_unref() on a bin object,
- * will also destoy all the #GstElement objects in it. The same is true for
- * calling gst_bin_remove().
- *
- * Special care has to be taken for all methods that gst_object_sink() an object
- * since if the caller of those functions had a floating reference to the object,
- * the object reference is now invalid.
+ * Since #GstObject dereives from #GInitiallyUnowned, it also inherits the
+ * floating reference. Be aware that functions such as gst_bin_add() and
+ * gst_element_add_pad() take ownership of the floating reference.
*
* In contrast to #GObject instances, #GstObject adds a name property. The functions
* gst_object_set_name() and gst_object_get_name() are used to set/get the name
* </para>
* </refsect2>
*
- * Last reviewed on 2005-11-09 (0.9.4)
+ * Last reviewed on 2012-03-29 (0.11.3)
*/
#include "gst_private.h"
/**
* gst_object_ref:
- * @object: a #GstObject to reference
+ * @object: (type Gst.Object): a #GstObject to reference
*
* Increments the reference count on @object. This function
* does not take the lock on @object because it relies on
* constructs like :
* result = gst_object_ref (object->parent);
*
- * Returns: (transfer full): A pointer to @object
+ * Returns: (transfer full) (type Gst.Object): A pointer to @object
*/
gpointer
gst_object_ref (gpointer object)
/**
* gst_object_unref:
- * @object: a #GstObject to unreference
+ * @object: (type Gst.Object): a #GstObject to unreference
*
* Decrements the reference count on @object. If reference count hits
* zero, destroy @object. This function does not take the lock
return FALSE;
if (newobj)
- g_object_ref (newobj);
+ gst_object_ref (newobj);
while (G_UNLIKELY (!g_atomic_pointer_compare_and_exchange ((gpointer *)
oldobj, oldptr, newobj))) {
}
if (oldptr)
- g_object_unref (oldptr);
+ gst_object_unref (oldptr);
return oldptr != newobj;
}
GList *node;
for (node = self->control_bindings; node; node = g_list_next (node)) {
- g_object_unref (node->data);
+ gst_object_unparent (node->data);
}
g_list_free (self->control_bindings);
self->control_bindings = NULL;
type_name = g_quark_to_string (q);
if (strncmp (type_name, "Gst", 3) == 0)
type_name += 3;
- name = g_strdup_printf ("%s%d", type_name, count);
+ /* give the 20th "queue" element and the first "queue2" different names */
+ l = strlen (type_name);
+ if (l > 0 && g_ascii_isdigit (type_name[l - 1])) {
+ name = g_strdup_printf ("%s-%d", type_name, count);
+ } else {
+ name = g_strdup_printf ("%s%d", type_name, count);
+ }
+
l = strlen (name);
for (i = 0; i < l; i++)
name[i] = g_ascii_tolower (name[i]);
GST_OBJECT_LOCK (object);
if ((binding = gst_object_find_control_binding (object, property_name))) {
- g_object_ref (binding);
+ gst_object_ref (binding);
}
GST_OBJECT_UNLOCK (object);
* @n_values: the number of values
* @values: array to put control-values in
*
- * Gets a number of values for the given controllered property starting at the
+ * Gets a number of values for the given controlled property starting at the
* requested time. The array @values need to hold enough space for @n_values of
* the same type as the objects property's type.
*
* This function is useful if one wants to e.g. draw a graph of the control
* curve or apply a control curve sample by sample.
*
+ * The values are unboxed and ready to be used. The similar function
+ * gst_object_get_g_value_array() returns the array as #GValues and is
+ * better suites for bindings.
+ *
* Returns: %TRUE if the given array could be filled, %FALSE otherwise
*/
gboolean
gst_object_get_value_array (GstObject * object, const gchar * property_name,
GstClockTime timestamp, GstClockTime interval, guint n_values,
- GValue * values)
+ gpointer values)
{
gboolean res = FALSE;
GstControlBinding *binding;
return res;
}
+/**
+ * gst_object_get_g_value_array:
+ * @object: the object that has controlled properties
+ * @property_name: the name of the property to get
+ * @timestamp: the time that should be processed
+ * @interval: the time spacing between subsequent values
+ * @n_values: the number of values
+ * @values: array to put control-values in
+ *
+ * Gets a number of #GValues for the given controlled property starting at the
+ * requested time. The array @values need to hold enough space for @n_values of
+ * #GValue.
+ *
+ * This function is useful if one wants to e.g. draw a graph of the control
+ * curve or apply a control curve sample by sample.
+ *
+ * Returns: %TRUE if the given array could be filled, %FALSE otherwise
+ */
+gboolean
+gst_object_get_g_value_array (GstObject * object, const gchar * property_name,
+ GstClockTime timestamp, GstClockTime interval, guint n_values,
+ GValue * values)
+{
+ gboolean res = FALSE;
+ GstControlBinding *binding;
+
+ g_return_val_if_fail (GST_IS_OBJECT (object), FALSE);
+ g_return_val_if_fail (property_name, FALSE);
+ g_return_val_if_fail (GST_CLOCK_TIME_IS_VALID (timestamp), FALSE);
+ g_return_val_if_fail (GST_CLOCK_TIME_IS_VALID (interval), FALSE);
+ g_return_val_if_fail (values, FALSE);
+
+ GST_OBJECT_LOCK (object);
+ if ((binding = gst_object_find_control_binding (object, property_name))) {
+ res = gst_control_binding_get_g_value_array (binding, timestamp, interval,
+ n_values, values);
+ }
+ GST_OBJECT_UNLOCK (object);
+ return res;
+}
+
/**
* gst_object_get_control_rate:
projects / platform / upstream / gstreamer.git / blobdiff