--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/gstreamer_core/gst/gstelement.c Thu Dec 17 08:53:32 2009 +0200
@@ -0,0 +1,3184 @@
+/* GStreamer
+ * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
+ * 2004 Wim Taymans <wim@fluendo.com>
+ *
+ * gstelement.c: The base element, all elements derive from this
+ *
+ * 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.
+ */
+
+/**
+ * SECTION:gstelement
+ * @short_description: Abstract base class for all pipeline elements
+ * @see_also: #GstElementFactory, #GstPad
+ *
+ * GstElement is the abstract base class needed to construct an element that
+ * can be used in a GStreamer pipeline. Please refer to the plugin writers
+ * guide for more information on creating #GstElement subclasses.
+ *
+ * The name of a #GstElement can be get with gst_element_get_name() and set with
+ * gst_element_set_name(). For speed, GST_ELEMENT_NAME() can be used in the
+ * core when using the appropriate locking. Do not use this in plug-ins or
+ * applications in order to retain ABI compatibility.
+ *
+ * All elements have pads (of the type #GstPad). These pads link to pads on
+ * other elements. #GstBuffer flow between these linked pads.
+ * A #GstElement has a #GList of #GstPad structures for all their input (or sink)
+ * and output (or source) pads.
+ * Core and plug-in writers can add and remove pads with gst_element_add_pad()
+ * and gst_element_remove_pad().
+ *
+ * A pad of an element can be retrieved by name with gst_element_get_pad().
+ * An iterator of all pads can be retrieved with gst_element_iterate_pads().
+ *
+ * Elements can be linked through their pads.
+ * If the link is straightforward, use the gst_element_link()
+ * convenience function to link two elements, or gst_element_link_many()
+ * for more elements in a row.
+ * Use gst_element_link_filtered() to link two elements constrained by
+ * a specified set of #GstCaps.
+ * For finer control, use gst_element_link_pads() and
+ * gst_element_link_pads_filtered() to specify the pads to link on
+ * each element by name.
+ *
+ * Each element has a state (see #GstState). You can get and set the state
+ * of an element with gst_element_get_state() and gst_element_set_state().
+ * To get a string representation of a #GstState, use
+ * gst_element_state_get_name().
+ *
+ * You can get and set a #GstClock on an element using gst_element_get_clock()
+ * and gst_element_set_clock().
+ * Some elements can provide a clock for the pipeline if
+ * gst_element_provides_clock() returns %TRUE. With the
+ * gst_element_provide_clock() method one can retrieve the clock provided by
+ * such an element.
+ * Not all elements require a clock to operate correctly. If
+ * gst_element_requires_clock() returns %TRUE, a clock should be set on the
+ * element with gst_element_set_clock().
+ *
+ * Note that clock slection and distribution is normally handled by the
+ * toplevel #GstPipeline so the clock functions are only to be used in very
+ * specific situations.
+ *
+ * Last reviewed on 2006-03-12 (0.10.5)
+ */
+
+#include "gst_private.h"
+#include <glib.h>
+#include <stdarg.h>
+#include <gobject/gvaluecollector.h>
+
+#include "gstelement.h"
+#include "gstenumtypes.h"
+#include "gstbus.h"
+#include "gstmarshal.h"
+#include "gsterror.h"
+#include "gstevent.h"
+#include "gstutils.h"
+#include "gstinfo.h"
+#include "gst-i18n-lib.h"
+
+#ifdef __SYMBIAN32__
+#include <glib_global.h>
+#endif
+
+/* Element signals and args */
+enum
+{
+ PAD_ADDED,
+ PAD_REMOVED,
+ NO_MORE_PADS,
+ /* add more above */
+ LAST_SIGNAL
+};
+
+enum
+{
+ ARG_0
+ /* FILL ME */
+};
+
+extern void __gst_element_details_clear (GstElementDetails * dp);
+extern void __gst_element_details_copy (GstElementDetails * dest,
+ const GstElementDetails * src);
+
+static void gst_element_class_init (GstElementClass * klass);
+static void gst_element_init (GstElement * element);
+static void gst_element_base_class_init (gpointer g_class);
+static void gst_element_base_class_finalize (gpointer g_class);
+
+static void gst_element_dispose (GObject * object);
+static void gst_element_finalize (GObject * object);
+
+static GstStateChangeReturn gst_element_change_state_func (GstElement * element,
+ GstStateChange transition);
+static GstStateChangeReturn gst_element_get_state_func (GstElement * element,
+ GstState * state, GstState * pending, GstClockTime timeout);
+static GstStateChangeReturn gst_element_set_state_func (GstElement * element,
+ GstState state);
+static void gst_element_set_bus_func (GstElement * element, GstBus * bus);
+
+static gboolean gst_element_default_send_event (GstElement * element,
+ GstEvent * event);
+static gboolean gst_element_default_query (GstElement * element,
+ GstQuery * query);
+
+static GstPadTemplate
+ * gst_element_class_get_request_pad_template (GstElementClass *
+ element_class, const gchar * name);
+
+#ifndef GST_DISABLE_LOADSAVE
+static xmlNodePtr gst_element_save_thyself (GstObject * object,
+ xmlNodePtr parent);
+static void gst_element_restore_thyself (GstObject * parent, xmlNodePtr self);
+#endif
+
+static GstObjectClass *parent_class = NULL;
+static guint gst_element_signals[LAST_SIGNAL] = { 0 };
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+
+GType
+gst_element_get_type (void)
+{
+ static GType gst_element_type = 0;
+
+ if (G_UNLIKELY (gst_element_type == 0)) {
+ static const GTypeInfo element_info = {
+ sizeof (GstElementClass),
+ gst_element_base_class_init,
+ gst_element_base_class_finalize,
+ (GClassInitFunc) gst_element_class_init,
+ NULL,
+ NULL,
+ sizeof (GstElement),
+ 0,
+ (GInstanceInitFunc) gst_element_init,
+ NULL
+ };
+
+ gst_element_type = g_type_register_static (GST_TYPE_OBJECT, "GstElement",
+ &element_info, G_TYPE_FLAG_ABSTRACT);
+ }
+ return gst_element_type;
+}
+
+static void
+gst_element_class_init (GstElementClass * klass)
+{
+ GObjectClass *gobject_class;
+ GstObjectClass *gstobject_class;
+
+ gobject_class = (GObjectClass *) klass;
+ gstobject_class = (GstObjectClass *) klass;
+
+ parent_class = g_type_class_peek_parent (klass);
+
+ /**
+ * GstElement::pad-added:
+ * @gstelement: the object which received the signal
+ * @new_pad: the pad that has been added
+ *
+ * a new #GstPad has been added to the element.
+ */
+ gst_element_signals[PAD_ADDED] =
+ g_signal_new ("pad-added", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
+ G_STRUCT_OFFSET (GstElementClass, pad_added), NULL, NULL,
+ gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_PAD);
+ /**
+ * GstElement::pad-removed:
+ * @gstelement: the object which received the signal
+ * @old_pad: the pad that has been removed
+ *
+ * a #GstPad has been removed from the element
+ */
+ gst_element_signals[PAD_REMOVED] =
+ g_signal_new ("pad-removed", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
+ G_STRUCT_OFFSET (GstElementClass, pad_removed), NULL, NULL,
+ gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_PAD);
+ /**
+ * GstElement::no-more-pads:
+ * @gstelement: the object which received the signal
+ *
+ * This signals that the element will not generate more dynamic pads.
+ */
+ gst_element_signals[NO_MORE_PADS] =
+ g_signal_new ("no-more-pads", G_TYPE_FROM_CLASS (klass),
+ G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstElementClass, no_more_pads), NULL,
+ NULL, gst_marshal_VOID__VOID, G_TYPE_NONE, 0);
+
+ gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_element_dispose);
+ gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_element_finalize);
+
+#ifndef GST_DISABLE_LOADSAVE
+ gstobject_class->save_thyself = GST_DEBUG_FUNCPTR (gst_element_save_thyself);
+ gstobject_class->restore_thyself =
+ GST_DEBUG_FUNCPTR (gst_element_restore_thyself);
+#endif
+
+ klass->change_state = GST_DEBUG_FUNCPTR (gst_element_change_state_func);
+ klass->set_state = GST_DEBUG_FUNCPTR (gst_element_set_state_func);
+ klass->get_state = GST_DEBUG_FUNCPTR (gst_element_get_state_func);
+ klass->set_bus = GST_DEBUG_FUNCPTR (gst_element_set_bus_func);
+ klass->query = GST_DEBUG_FUNCPTR (gst_element_default_query);
+ klass->send_event = GST_DEBUG_FUNCPTR (gst_element_default_send_event);
+ klass->numpadtemplates = 0;
+
+ klass->elementfactory = NULL;
+}
+
+static void
+gst_element_base_class_init (gpointer g_class)
+{
+ GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
+
+ /* FIXME 0.11: Copy the element details and instead of clearing the
+ * pad template list copy the list and increase the refcount of
+ * the pad templates by one.
+ *
+ * This will make it possible to add pad templates and set element
+ * details in the class_init functions and is the real GObject way
+ * of doing things.
+ * See http://bugzilla.gnome.org/show_bug.cgi?id=491501
+ */
+ memset (&element_class->details, 0, sizeof (GstElementDetails));
+ element_class->padtemplates = NULL;
+}
+
+static void
+gst_element_base_class_finalize (gpointer g_class)
+{
+ GstElementClass *klass = GST_ELEMENT_CLASS (g_class);
+
+ g_list_foreach (klass->padtemplates, (GFunc) gst_object_unref, NULL);
+ g_list_free (klass->padtemplates);
+ __gst_element_details_clear (&klass->details);
+}
+
+static void
+gst_element_init (GstElement * element)
+{
+ GST_STATE (element) = GST_STATE_NULL;
+ GST_STATE_TARGET (element) = GST_STATE_NULL;
+ GST_STATE_NEXT (element) = GST_STATE_VOID_PENDING;
+ GST_STATE_PENDING (element) = GST_STATE_VOID_PENDING;
+ GST_STATE_RETURN (element) = GST_STATE_CHANGE_SUCCESS;
+
+ element->state_lock = g_new0 (GStaticRecMutex, 1);
+ g_static_rec_mutex_init (element->state_lock);
+ element->state_cond = g_cond_new ();
+}
+
+/**
+ * gst_element_default_error:
+ * @object: a #GObject that signalled the error.
+ * @orig: the #GstObject that initiated the error.
+ * @error: the GError.
+ * @debug: an additional debug information string, or %NULL.
+ *
+ * A default error signal callback to attach to an element.
+ * The user data passed to the g_signal_connect is ignored.
+ *
+ * The default handler will simply print the error string using g_print.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_element_default_error (GObject * object, GstObject * source, GError * error,
+ gchar * debug)
+{
+ gchar *name = gst_object_get_path_string (source);
+
+ g_print (_("ERROR: from element %s: %s\n"), name, error->message);
+ if (debug)
+ g_print (_("Additional debug info:\n%s\n"), debug);
+
+ g_free (name);
+}
+
+/**
+ * gst_element_release_request_pad:
+ * @element: a #GstElement to release the request pad of.
+ * @pad: the #GstPad to release.
+ *
+ * Makes the element free the previously requested pad as obtained
+ * with gst_element_get_request_pad().
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_element_release_request_pad (GstElement * element, GstPad * pad)
+{
+ GstElementClass *oclass;
+
+ g_return_if_fail (GST_IS_ELEMENT (element));
+ g_return_if_fail (GST_IS_PAD (pad));
+
+ oclass = GST_ELEMENT_GET_CLASS (element);
+
+ /* if the element implements a custom release function we call that, else we
+ * simply remove the pad from the element */
+ if (oclass->release_pad)
+ (oclass->release_pad) (element, pad);
+ else
+ gst_element_remove_pad (element, pad);
+}
+
+/**
+ * gst_element_requires_clock:
+ * @element: a #GstElement to query
+ *
+ * Query if the element requires a clock.
+ *
+ * Returns: %TRUE if the element requires a clock
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_element_requires_clock (GstElement * element)
+{
+ gboolean result;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
+
+ result = (GST_ELEMENT_GET_CLASS (element)->set_clock != NULL);
+
+ return result;
+}
+
+/**
+ * gst_element_provides_clock:
+ * @element: a #GstElement to query
+ *
+ * Query if the element provides a clock. A #GstClock provided by an
+ * element can be used as the global #GstClock for the pipeline.
+ * An element that can provide a clock is only required to do so in the PAUSED
+ * state, this means when it is fully negotiated and has allocated the resources
+ * to operate the clock.
+ *
+ * Returns: %TRUE if the element provides a clock
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_element_provides_clock (GstElement * element)
+{
+ gboolean result;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
+
+ result = (GST_ELEMENT_GET_CLASS (element)->provide_clock != NULL);
+
+ return result;
+}
+
+/**
+ * gst_element_provide_clock:
+ * @element: a #GstElement to query
+ *
+ * Get the clock provided by the given element.
+ * <note>An element is only required to provide a clock in the PAUSED
+ * state. Some elements can provide a clock in other states.</note>
+ *
+ * Returns: the GstClock provided by the element or %NULL
+ * if no clock could be provided. Unref after usage.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstClock *
+gst_element_provide_clock (GstElement * element)
+{
+ GstClock *result = NULL;
+ GstElementClass *oclass;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
+
+ oclass = GST_ELEMENT_GET_CLASS (element);
+
+ if (oclass->provide_clock)
+ result = oclass->provide_clock (element);
+
+ return result;
+}
+
+/**
+ * gst_element_set_clock:
+ * @element: a #GstElement to set the clock for.
+ * @clock: the #GstClock to set for the element.
+ *
+ * Sets the clock for the element. This function increases the
+ * refcount on the clock. Any previously set clock on the object
+ * is unreffed.
+ *
+ * Returns: %TRUE if the element accepted the clock. An element can refuse a
+ * clock when it, for example, is not able to slave its internal clock to the
+ * @clock or when it requires a specific clock to operate.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_element_set_clock (GstElement * element, GstClock * clock)
+{
+ GstElementClass *oclass;
+ gboolean res = TRUE;
+ GstClock **clock_p;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
+
+ oclass = GST_ELEMENT_GET_CLASS (element);
+
+ GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, element, "setting clock %p", clock);
+
+ if (oclass->set_clock)
+ res = oclass->set_clock (element, clock);
+
+ if (res) {
+ /* only update the clock pointer if the element accepted the clock */
+ GST_OBJECT_LOCK (element);
+ clock_p = &element->clock;
+ gst_object_replace ((GstObject **) clock_p, (GstObject *) clock);
+ GST_OBJECT_UNLOCK (element);
+ }
+ return res;
+}
+
+/**
+ * gst_element_get_clock:
+ * @element: a #GstElement to get the clock of.
+ *
+ * Gets the currently configured clock of the element. This is the clock as was
+ * last set with gst_element_set_clock().
+ *
+ * Returns: the #GstClock of the element. unref after usage.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstClock *
+gst_element_get_clock (GstElement * element)
+{
+ GstClock *result;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
+
+ GST_OBJECT_LOCK (element);
+ if ((result = element->clock))
+ gst_object_ref (result);
+ GST_OBJECT_UNLOCK (element);
+
+ return result;
+}
+
+/**
+ * gst_element_set_base_time:
+ * @element: a #GstElement.
+ * @time: the base time to set.
+ *
+ * Set the base time of an element. See gst_element_get_base_time().
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_element_set_base_time (GstElement * element, GstClockTime time)
+{
+ GstClockTime old;
+
+ g_return_if_fail (GST_IS_ELEMENT (element));
+
+ GST_OBJECT_LOCK (element);
+ old = element->base_time;
+ element->base_time = time;
+ GST_OBJECT_UNLOCK (element);
+
+ GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, element,
+ "set base_time=%" GST_TIME_FORMAT ", old %" GST_TIME_FORMAT,
+ GST_TIME_ARGS (time), GST_TIME_ARGS (old));
+}
+
+/**
+ * gst_element_get_base_time:
+ * @element: a #GstElement.
+ *
+ * Returns the base time of the element. The base time is the
+ * absolute time of the clock when this element was last put to
+ * PLAYING. Subtracting the base time from the clock time gives
+ * the stream time of the element.
+ *
+ * Returns: the base time of the element.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstClockTime
+gst_element_get_base_time (GstElement * element)
+{
+ GstClockTime result;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), GST_CLOCK_TIME_NONE);
+
+ GST_OBJECT_LOCK (element);
+ result = element->base_time;
+ GST_OBJECT_UNLOCK (element);
+
+ return result;
+}
+
+#ifndef GST_DISABLE_INDEX
+/**
+ * gst_element_is_indexable:
+ * @element: a #GstElement.
+ *
+ * Queries if the element can be indexed.
+ *
+ * Returns: TRUE if the element can be indexed.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_element_is_indexable (GstElement * element)
+{
+ gboolean result;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
+
+ result = (GST_ELEMENT_GET_CLASS (element)->set_index != NULL);
+
+ return result;
+}
+
+/**
+ * gst_element_set_index:
+ * @element: a #GstElement.
+ * @index: a #GstIndex.
+ *
+ * Set @index on the element. The refcount of the index
+ * will be increased, any previously set index is unreffed.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_element_set_index (GstElement * element, GstIndex * index)
+{
+ GstElementClass *oclass;
+
+ g_return_if_fail (GST_IS_ELEMENT (element));
+ g_return_if_fail (GST_IS_INDEX (index));
+
+ oclass = GST_ELEMENT_GET_CLASS (element);
+
+ if (oclass->set_index)
+ oclass->set_index (element, index);
+}
+
+/**
+ * gst_element_get_index:
+ * @element: a #GstElement.
+ *
+ * Gets the index from the element.
+ *
+ * Returns: a #GstIndex or %NULL when no index was set on the
+ * element. unref after usage.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstIndex *
+gst_element_get_index (GstElement * element)
+{
+ GstElementClass *oclass;
+ GstIndex *result = NULL;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
+
+ oclass = GST_ELEMENT_GET_CLASS (element);
+
+ if (oclass->get_index)
+ result = oclass->get_index (element);
+
+ return result;
+}
+#endif
+
+/**
+ * gst_element_add_pad:
+ * @element: a #GstElement to add the pad to.
+ * @pad: the #GstPad to add to the element.
+ *
+ * Adds a pad (link point) to @element. @pad's parent will be set to @element;
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+ * see gst_object_set_parent() for refcounting information.
+ *
+ * Pads are not automatically activated so elements should perform the needed
+ * steps to activate the pad in case this pad is added in the PAUSED or PLAYING
+ * state. See gst_pad_set_active() for more information about activating pads.
+ *
+ * The pad and the element should be unlocked when calling this function.
+ *
+ * This function will emit the #GstElement::pad-added signal on the element.
+ *
+ * Returns: %TRUE if the pad could be added. This function can fail when
+ * a pad with the same name already existed or the pad already had another
+ * parent.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_element_add_pad (GstElement * element, GstPad * pad)
+{
+ gchar *pad_name;
+ gboolean flushing;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
+ g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
+
+ /* locking pad to look at the name */
+ GST_OBJECT_LOCK (pad);
+ pad_name = g_strdup (GST_PAD_NAME (pad));
+ GST_CAT_INFO_OBJECT (GST_CAT_ELEMENT_PADS, element, "adding pad '%s'",
+ GST_STR_NULL (pad_name));
+ flushing = GST_PAD_IS_FLUSHING (pad);
+ GST_OBJECT_UNLOCK (pad);
+
+ /* then check to see if there's already a pad by that name here */
+ GST_OBJECT_LOCK (element);
+ if (G_UNLIKELY (!gst_object_check_uniqueness (element->pads, pad_name)))
+ goto name_exists;
+
+ /* try to set the pad's parent */
+ if (G_UNLIKELY (!gst_object_set_parent (GST_OBJECT_CAST (pad),
+ GST_OBJECT_CAST (element))))
+ goto had_parent;
+
+ /* check for flushing pads */
+ if (flushing && (GST_STATE (element) > GST_STATE_READY ||
+ GST_STATE_NEXT (element) == GST_STATE_PAUSED)) {
+ g_warning ("adding flushing pad '%s' to running element '%s'",
+ GST_STR_NULL (pad_name), GST_ELEMENT_NAME (element));
+ /* unset flushing */
+ GST_OBJECT_LOCK (pad);
+ GST_PAD_UNSET_FLUSHING (pad);
+ GST_OBJECT_UNLOCK (pad);
+ }
+
+ g_free (pad_name);
+
+ /* add it to the list */
+ switch (gst_pad_get_direction (pad)) {
+ case GST_PAD_SRC:
+ element->srcpads = g_list_prepend (element->srcpads, pad);
+ element->numsrcpads++;
+ break;
+ case GST_PAD_SINK:
+ element->sinkpads = g_list_prepend (element->sinkpads, pad);
+ element->numsinkpads++;
+ break;
+ default:
+ goto no_direction;
+ }
+ element->pads = g_list_prepend (element->pads, pad);
+ element->numpads++;
+ element->pads_cookie++;
+ GST_OBJECT_UNLOCK (element);
+
+ /* emit the PAD_ADDED signal */
+ g_signal_emit (element, gst_element_signals[PAD_ADDED], 0, pad);
+
+ return TRUE;
+
+ /* ERROR cases */
+name_exists:
+ {
+ g_critical ("Padname %s is not unique in element %s, not adding",
+ pad_name, GST_ELEMENT_NAME (element));
+ GST_OBJECT_UNLOCK (element);
+ g_free (pad_name);
+ return FALSE;
+ }
+had_parent:
+ {
+ g_critical
+ ("Pad %s already has parent when trying to add to element %s",
+ pad_name, GST_ELEMENT_NAME (element));
+ GST_OBJECT_UNLOCK (element);
+ g_free (pad_name);
+ return FALSE;
+ }
+no_direction:
+ {
+ GST_OBJECT_LOCK (pad);
+ g_critical
+ ("Trying to add pad %s to element %s, but it has no direction",
+ GST_OBJECT_NAME (pad), GST_ELEMENT_NAME (element));
+ GST_OBJECT_UNLOCK (pad);
+ GST_OBJECT_UNLOCK (element);
+ return FALSE;
+ }
+}
+
+/**
+ * gst_element_remove_pad:
+ * @element: a #GstElement to remove pad from.
+ * @pad: the #GstPad to remove from the element.
+ *
+ * Removes @pad from @element. @pad will be destroyed if it has not been
+ * referenced elsewhere using gst_object_unparent().
+ *
+ * This function is used by plugin developers and should not be used
+ * by applications. Pads that were dynamically requested from elements
+ * with gst_element_get_request_pad() should be released with the
+ * gst_element_release_request_pad() function instead.
+ *
+ * Pads are not automatically deactivated so elements should perform the needed
+ * steps to deactivate the pad in case this pad is removed in the PAUSED or
+ * PLAYING state. See gst_pad_set_active() for more information about
+ * deactivating pads.
+ *
+ * The pad and the element should be unlocked when calling this function.
+ *
+ * This function will emit the #GstElement::pad-removed signal on the element.
+ *
+ * Returns: %TRUE if the pad could be removed. Can return %FALSE if the
+ * pad does not belong to the provided element.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_element_remove_pad (GstElement * element, GstPad * pad)
+{
+ GstPad *peer;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
+ g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
+
+ /* locking pad to look at the name and parent */
+ GST_OBJECT_LOCK (pad);
+ GST_CAT_INFO_OBJECT (GST_CAT_ELEMENT_PADS, element, "removing pad '%s'",
+ GST_STR_NULL (GST_PAD_NAME (pad)));
+
+ if (G_UNLIKELY (GST_PAD_PARENT (pad) != element))
+ goto not_our_pad;
+ GST_OBJECT_UNLOCK (pad);
+
+ /* unlink */
+ if ((peer = gst_pad_get_peer (pad))) {
+ /* window for MT unsafeness, someone else could unlink here
+ * and then we call unlink with wrong pads. The unlink
+ * function would catch this and safely return failed. */
+ if (GST_PAD_IS_SRC (pad))
+ gst_pad_unlink (pad, peer);
+ else
+ gst_pad_unlink (peer, pad);
+
+ gst_object_unref (peer);
+ }
+
+ GST_OBJECT_LOCK (element);
+ /* remove it from the list */
+ switch (gst_pad_get_direction (pad)) {
+ case GST_PAD_SRC:
+ element->srcpads = g_list_remove (element->srcpads, pad);
+ element->numsrcpads--;
+ break;
+ case GST_PAD_SINK:
+ element->sinkpads = g_list_remove (element->sinkpads, pad);
+ element->numsinkpads--;
+ break;
+ default:
+ g_critical ("Removing pad without direction???");
+ break;
+ }
+ element->pads = g_list_remove (element->pads, pad);
+ element->numpads--;
+ element->pads_cookie++;
+ GST_OBJECT_UNLOCK (element);
+
+ /* emit the PAD_REMOVED signal before unparenting and losing the last ref. */
+ g_signal_emit (element, gst_element_signals[PAD_REMOVED], 0, pad);
+
+ gst_object_unparent (GST_OBJECT_CAST (pad));
+
+ return TRUE;
+
+ /* ERRORS */
+not_our_pad:
+ {
+ /* FIXME, locking order? */
+ GST_OBJECT_LOCK (element);
+ g_critical ("Padname %s:%s does not belong to element %s when removing",
+ GST_DEBUG_PAD_NAME (pad), GST_ELEMENT_NAME (element));
+ GST_OBJECT_UNLOCK (element);
+ GST_OBJECT_UNLOCK (pad);
+ return FALSE;
+ }
+}
+
+/**
+ * gst_element_no_more_pads:
+ * @element: a #GstElement
+ *
+ * Use this function to signal that the element does not expect any more pads
+ * to show up in the current pipeline. This function should be called whenever
+ * pads have been added by the element itself. Elements with #GST_PAD_SOMETIMES
+ * pad templates use this in combination with autopluggers to figure out that
+ * the element is done initializing its pads.
+ *
+ * This function emits the #GstElement::no-more-pads signal.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_element_no_more_pads (GstElement * element)
+{
+ g_return_if_fail (GST_IS_ELEMENT (element));
+
+ g_signal_emit (element, gst_element_signals[NO_MORE_PADS], 0);
+}
+
+static gint
+pad_compare_name (GstPad * pad1, const gchar * name)
+{
+ gint result;
+
+ GST_OBJECT_LOCK (pad1);
+ result = strcmp (GST_PAD_NAME (pad1), name);
+ GST_OBJECT_UNLOCK (pad1);
+
+ return result;
+}
+
+/**
+ * gst_element_get_static_pad:
+ * @element: a #GstElement to find a static pad of.
+ * @name: the name of the static #GstPad to retrieve.
+ *
+ * Retrieves a pad from @element by name. This version only retrieves
+ * already-existing (i.e. 'static') pads.
+ *
+ * Returns: the requested #GstPad if found, otherwise %NULL. unref after
+ * usage.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstPad *
+gst_element_get_static_pad (GstElement * element, const gchar * name)
+{
+ GList *find;
+ GstPad *result = NULL;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
+ g_return_val_if_fail (name != NULL, NULL);
+
+ GST_OBJECT_LOCK (element);
+ find =
+ g_list_find_custom (element->pads, name, (GCompareFunc) pad_compare_name);
+ if (find) {
+ result = GST_PAD_CAST (find->data);
+ gst_object_ref (result);
+ }
+
+ if (result == NULL) {
+ GST_CAT_INFO (GST_CAT_ELEMENT_PADS, "no such pad '%s' in element \"%s\"",
+ name, GST_ELEMENT_NAME (element));
+ } else {
+ GST_CAT_INFO (GST_CAT_ELEMENT_PADS, "found pad %s:%s",
+ GST_ELEMENT_NAME (element), name);
+ }
+ GST_OBJECT_UNLOCK (element);
+
+ return result;
+}
+
+static GstPad *
+gst_element_request_pad (GstElement * element, GstPadTemplate * templ,
+ const gchar * name)
+{
+ GstPad *newpad = NULL;
+ GstElementClass *oclass;
+
+ oclass = GST_ELEMENT_GET_CLASS (element);
+
+ if (oclass->request_new_pad)
+ newpad = (oclass->request_new_pad) (element, templ, name);
+
+ if (newpad)
+ gst_object_ref (newpad);
+
+ return newpad;
+}
+
+/**
+ * gst_element_get_request_pad:
+ * @element: a #GstElement to find a request pad of.
+ * @name: the name of the request #GstPad to retrieve.
+ *
+ * Retrieves a pad from the element by name. This version only retrieves
+ * request pads. The pad should be released with
+ * gst_element_release_request_pad().
+ *
+ * Returns: requested #GstPad if found, otherwise %NULL. Release after usage.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstPad *
+gst_element_get_request_pad (GstElement * element, const gchar * name)
+{
+ GstPadTemplate *templ = NULL;
+ GstPad *pad;
+ const gchar *req_name = NULL;
+ gboolean templ_found = FALSE;
+ GList *list;
+ gint n;
+ const gchar *data;
+ gchar *str, *endptr = NULL;
+ GstElementClass *class;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
+ g_return_val_if_fail (name != NULL, NULL);
+
+ class = GST_ELEMENT_GET_CLASS (element);
+
+ /* if the name contains a %, we assume it's the complete template name. Get
+ * the template and try to get a pad */
+ if (strstr (name, "%")) {
+ templ = gst_element_class_get_request_pad_template (class, name);
+ req_name = NULL;
+ if (templ)
+ templ_found = TRUE;
+ } else {
+ /* there is no % in the name, try to find a matching template */
+ list = gst_element_class_get_pad_template_list (class);
+ while (!templ_found && list) {
+ templ = (GstPadTemplate *) list->data;
+ if (templ->presence == GST_PAD_REQUEST) {
+ GST_CAT_DEBUG (GST_CAT_PADS, "comparing %s to %s", name,
+ templ->name_template);
+ /* see if we find an exact match */
+ if (strcmp (name, templ->name_template) == 0) {
+ templ_found = TRUE;
+ req_name = name;
+ break;
+ }
+ /* Because of sanity checks in gst_pad_template_new(), we know that %s
+ and %d, occurring at the end of the name_template, are the only
+ possibilities. */
+ else if ((str = strchr (templ->name_template, '%'))
+ && strncmp (templ->name_template, name,
+ str - templ->name_template) == 0
+ && strlen (name) > str - templ->name_template) {
+ data = name + (str - templ->name_template);
+ if (*(str + 1) == 'd') {
+ /* it's an int */
+ n = (gint) strtol (data, &endptr, 10);
+ if (endptr && *endptr == '\0') {
+ templ_found = TRUE;
+ req_name = name;
+ break;
+ }
+ } else {
+ /* it's a string */
+ templ_found = TRUE;
+ req_name = name;
+ break;
+ }
+ }
+ }
+ list = list->next;
+ }
+ }
+
+ if (!templ_found)
+ return NULL;
+
+ pad = gst_element_request_pad (element, templ, req_name);
+
+ return pad;
+}
+
+/**
+ * gst_element_get_pad:
+ * @element: a #GstElement.
+ * @name: the name of the pad to retrieve.
+ *
+ * Retrieves a pad from @element by name. Tries gst_element_get_static_pad()
+ * first, then gst_element_get_request_pad().
+ *
+ * <note>Usage of this function is not recommended as it is unclear if the reference
+ * to the result pad should be released with gst_object_unref() in case of a static pad
+ * or gst_element_release_request_pad() in case of a request pad.</note>
+ *
+ * Returns: the #GstPad if found, otherwise %NULL. Unref or Release after usage,
+ * depending on the type of the pad.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstPad *
+gst_element_get_pad (GstElement * element, const gchar * name)
+{
+ GstPad *pad;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
+ g_return_val_if_fail (name != NULL, NULL);
+
+ pad = gst_element_get_static_pad (element, name);
+ if (!pad)
+ pad = gst_element_get_request_pad (element, name);
+
+ return pad;
+}
+
+static GstIteratorItem
+iterate_pad (GstIterator * it, GstPad * pad)
+{
+ gst_object_ref (pad);
+ return GST_ITERATOR_ITEM_PASS;
+}
+
+static GstIterator *
+gst_element_iterate_pad_list (GstElement * element, GList ** padlist)
+{
+ GstIterator *result;
+
+ GST_OBJECT_LOCK (element);
+ gst_object_ref (element);
+ result = gst_iterator_new_list (GST_TYPE_PAD,
+ GST_OBJECT_GET_LOCK (element),
+ &element->pads_cookie,
+ padlist,
+ element,
+ (GstIteratorItemFunction) iterate_pad,
+ (GstIteratorDisposeFunction) gst_object_unref);
+ GST_OBJECT_UNLOCK (element);
+
+ return result;
+}
+
+/**
+ * gst_element_iterate_pads:
+ * @element: a #GstElement to iterate pads of.
+ *
+ * Retrieves an iterattor of @element's pads. The iterator should
+ * be freed after usage.
+ *
+ * Returns: the #GstIterator of #GstPad. Unref each pad after use.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstIterator *
+gst_element_iterate_pads (GstElement * element)
+{
+ g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
+
+ return gst_element_iterate_pad_list (element, &element->pads);
+}
+
+/**
+ * gst_element_iterate_src_pads:
+ * @element: a #GstElement.
+ *
+ * Retrieves an iterator of @element's source pads.
+ *
+ * Returns: the #GstIterator of #GstPad. Unref each pad after use.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstIterator *
+gst_element_iterate_src_pads (GstElement * element)
+{
+ g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
+
+ return gst_element_iterate_pad_list (element, &element->srcpads);
+}
+
+/**
+ * gst_element_iterate_sink_pads:
+ * @element: a #GstElement.
+ *
+ * Retrieves an iterator of @element's sink pads.
+ *
+ * Returns: the #GstIterator of #GstPad. Unref each pad after use.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstIterator *
+gst_element_iterate_sink_pads (GstElement * element)
+{
+ g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
+
+ return gst_element_iterate_pad_list (element, &element->sinkpads);
+}
+
+/**
+ * gst_element_class_add_pad_template:
+ * @klass: the #GstElementClass to add the pad template to.
+ * @templ: a #GstPadTemplate to add to the element class.
+ *
+ * Adds a padtemplate to an element class. This is mainly used in the _base_init
+ * functions of classes.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_element_class_add_pad_template (GstElementClass * klass,
+ GstPadTemplate * templ)
+{
+ g_return_if_fail (GST_IS_ELEMENT_CLASS (klass));
+ g_return_if_fail (GST_IS_PAD_TEMPLATE (templ));
+
+ /* FIXME 0.11: allow replacing the pad templates by
+ * calling this with the same name as an already existing pad
+ * template. For this we _must_ _not_ ref the added pad template
+ * a second time and _must_ document that this function takes
+ * ownership of the pad template. Otherwise we will leak pad templates
+ * or the caller unref's the pad template and it disappears */
+ /* avoid registering pad templates with the same name */
+ g_return_if_fail (gst_element_class_get_pad_template (klass,
+ templ->name_template) == NULL);
+
+ klass->padtemplates = g_list_append (klass->padtemplates,
+ gst_object_ref (templ));
+ klass->numpadtemplates++;
+}
+
+/**
+ * gst_element_class_set_details:
+ * @klass: class to set details for
+ * @details: details to set
+ *
+ * Sets the detailed information for a #GstElementClass.
+ * <note>This function is for use in _base_init functions only.</note>
+ *
+ * The @details are copied.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_element_class_set_details (GstElementClass * klass,
+ const GstElementDetails * details)
+{
+ g_return_if_fail (GST_IS_ELEMENT_CLASS (klass));
+ g_return_if_fail (GST_IS_ELEMENT_DETAILS (details));
+
+ __gst_element_details_copy (&klass->details, details);
+}
+
+/**
+ * gst_element_class_set_details_simple:
+ * @klass: class to set details for
+ * @longname: The long English name of the element. E.g. "File Sink"
+ * @classification: String describing the type of element, as an unordered list
+ * separated with slashes ('/'). See draft-klass.txt of the design docs
+ * for more details and common types. E.g: "Sink/File"
+ * @description: Sentence describing the purpose of the element.
+ * E.g: "Write stream to a file"
+ * @author: Name and contact details of the author(s). Use \n to separate
+ * multiple author details. E.g: "Joe Bloggs <joe.blogs at foo.com>"
+ *
+ * Sets the detailed information for a #GstElementClass. Simpler version of
+ * gst_element_class_set_details() that generates less linker overhead.
+ * <note>This function is for use in _base_init functions only.</note>
+ *
+ * The detail parameter strings are copied into the #GstElementDetails for
+ * the element class.
+ *
+ * Since: 0.10.14
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_element_class_set_details_simple (GstElementClass * klass,
+ const gchar * longname, const gchar * classification,
+ const gchar * description, const gchar * author)
+{
+#ifdef __SYMBIAN32__ // VASU
+ const GstElementDetails details;
+ ((GstElementDetails*)&details)->longname = (gchar *) longname;
+ ((GstElementDetails*)&details)->klass = (gchar *) classification;
+ ((GstElementDetails*)&details)->description = (gchar *) description;
+ ((GstElementDetails*)&details)->author = (gchar *) author;
+ ((GstElementDetails*)&details)->_gst_reserved[0] = NULL;
+#else
+ const GstElementDetails details =
+ GST_ELEMENT_DETAILS ((gchar *) longname, (gchar *) classification,
+ (gchar *) description, (gchar *) author);
+#endif // __SYMBIAN32__
+
+ g_return_if_fail (GST_IS_ELEMENT_CLASS (klass));
+
+ __gst_element_details_copy (&klass->details, &details);
+}
+
+/**
+ * gst_element_class_get_pad_template_list:
+ * @element_class: a #GstElementClass to get pad templates of.
+ *
+ * Retrieves a list of the pad templates associated with @element_class. The
+ * list must not be modified by the calling code.
+ * <note>If you use this function in the #GInstanceInitFunc of an object class
+ * that has subclasses, make sure to pass the g_class parameter of the
+ * #GInstanceInitFunc here.</note>
+ *
+ * Returns: the #GList of padtemplates.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GList *
+gst_element_class_get_pad_template_list (GstElementClass * element_class)
+{
+ g_return_val_if_fail (GST_IS_ELEMENT_CLASS (element_class), NULL);
+
+ return element_class->padtemplates;
+}
+
+/**
+ * gst_element_class_get_pad_template:
+ * @element_class: a #GstElementClass to get the pad template of.
+ * @name: the name of the #GstPadTemplate to get.
+ *
+ * Retrieves a padtemplate from @element_class with the given name.
+ * <note>If you use this function in the #GInstanceInitFunc of an object class
+ * that has subclasses, make sure to pass the g_class parameter of the
+ * #GInstanceInitFunc here.</note>
+ *
+ * Returns: the #GstPadTemplate with the given name, or %NULL if none was found.
+ * No unreferencing is necessary.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstPadTemplate *
+gst_element_class_get_pad_template (GstElementClass * element_class,
+ const gchar * name)
+{
+ GList *padlist;
+
+ g_return_val_if_fail (GST_IS_ELEMENT_CLASS (element_class), NULL);
+ g_return_val_if_fail (name != NULL, NULL);
+
+ padlist = gst_element_class_get_pad_template_list (element_class);
+
+ while (padlist) {
+ GstPadTemplate *padtempl = (GstPadTemplate *) padlist->data;
+
+ if (strcmp (padtempl->name_template, name) == 0)
+ return padtempl;
+
+ padlist = g_list_next (padlist);
+ }
+
+ return NULL;
+}
+
+static GstPadTemplate *
+gst_element_class_get_request_pad_template (GstElementClass * element_class,
+ const gchar * name)
+{
+ GstPadTemplate *tmpl;
+
+ tmpl = gst_element_class_get_pad_template (element_class, name);
+ if (tmpl != NULL && tmpl->presence == GST_PAD_REQUEST)
+ return tmpl;
+
+ return NULL;
+}
+
+/* get a random pad on element of the given direction.
+ * The pad is random in a sense that it is the first pad that is (optionaly) linked.
+ */
+static GstPad *
+gst_element_get_random_pad (GstElement * element, gboolean need_linked,
+ GstPadDirection dir)
+{
+ GstPad *result = NULL;
+ GList *pads;
+
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "getting a random pad");
+
+ switch (dir) {
+ case GST_PAD_SRC:
+ GST_OBJECT_LOCK (element);
+ pads = element->srcpads;
+ break;
+ case GST_PAD_SINK:
+ GST_OBJECT_LOCK (element);
+ pads = element->sinkpads;
+ break;
+ default:
+ goto wrong_direction;
+ }
+ for (; pads; pads = g_list_next (pads)) {
+ GstPad *pad = GST_PAD_CAST (pads->data);
+
+ GST_OBJECT_LOCK (pad);
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "checking pad %s:%s",
+ GST_DEBUG_PAD_NAME (pad));
+
+ if (need_linked && !GST_PAD_IS_LINKED (pad)) {
+ /* if we require a linked pad, and it is not linked, continue the
+ * search */
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "pad %s:%s is not linked",
+ GST_DEBUG_PAD_NAME (pad));
+ GST_OBJECT_UNLOCK (pad);
+ continue;
+ } else {
+ /* found a pad, stop search */
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "found pad %s:%s",
+ GST_DEBUG_PAD_NAME (pad));
+ GST_OBJECT_UNLOCK (pad);
+ result = pad;
+ break;
+ }
+ }
+ if (result)
+ gst_object_ref (result);
+
+ GST_OBJECT_UNLOCK (element);
+
+ return result;
+
+ /* ERROR handling */
+wrong_direction:
+ {
+ g_warning ("unknown pad direction %d", dir);
+ return NULL;
+ }
+}
+
+static gboolean
+gst_element_default_send_event (GstElement * element, GstEvent * event)
+{
+ gboolean result = FALSE;
+ GstPad *pad;
+
+ pad = GST_EVENT_IS_DOWNSTREAM (event) ?
+ gst_element_get_random_pad (element, TRUE, GST_PAD_SRC) :
+ gst_element_get_random_pad (element, TRUE, GST_PAD_SINK);
+
+ if (pad) {
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
+ "pushing %s event to random %s pad %s:%s",
+ GST_EVENT_TYPE_NAME (event),
+ (GST_PAD_DIRECTION (pad) == GST_PAD_SRC ? "src" : "sink"),
+ GST_DEBUG_PAD_NAME (pad));
+
+ result = gst_pad_push_event (pad, event);
+ gst_object_unref (pad);
+ } else {
+ GST_CAT_INFO (GST_CAT_ELEMENT_PADS, "can't send %s event on element %s",
+ GST_EVENT_TYPE_NAME (event), GST_ELEMENT_NAME (element));
+ }
+ return result;
+}
+
+/**
+ * gst_element_send_event:
+ * @element: a #GstElement to send the event to.
+ * @event: the #GstEvent to send to the element.
+ *
+ * Sends an event to an element. If the element doesn't implement an
+ * event handler, the event will be pushed on a random linked sink pad for
+ * upstream events or a random linked source pad for downstream events.
+ *
+ * This function takes owership of the provided event so you should
+ * gst_event_ref() it if you want to reuse the event after this call.
+ *
+ * Returns: %TRUE if the event was handled.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_element_send_event (GstElement * element, GstEvent * event)
+{
+ GstElementClass *oclass;
+ gboolean result = FALSE;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
+ g_return_val_if_fail (event != NULL, FALSE);
+
+ oclass = GST_ELEMENT_GET_CLASS (element);
+
+ GST_STATE_LOCK (element);
+ if (oclass->send_event) {
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "send %s event on element %s",
+ GST_EVENT_TYPE_NAME (event), GST_ELEMENT_NAME (element));
+ result = oclass->send_event (element, event);
+ } else {
+ result = gst_element_default_send_event (element, event);
+ }
+ GST_STATE_UNLOCK (element);
+
+ return result;
+}
+
+/**
+ * gst_element_seek:
+ * @element: a #GstElement to send the event to.
+ * @rate: The new playback rate
+ * @format: The format of the seek values
+ * @flags: The optional seek flags.
+ * @cur_type: The type and flags for the new current position
+ * @cur: The value of the new current position
+ * @stop_type: The type and flags for the new stop position
+ * @stop: The value of the new stop position
+ *
+ * Sends a seek event to an element. See gst_event_new_seek() for the details of
+ * the parameters. The seek event is sent to the element using
+ * gst_element_send_event().
+ *
+ * Returns: %TRUE if the event was handled.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_element_seek (GstElement * element, gdouble rate, GstFormat format,
+ GstSeekFlags flags, GstSeekType cur_type, gint64 cur,
+ GstSeekType stop_type, gint64 stop)
+{
+ GstEvent *event;
+ gboolean result;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
+
+ event =
+ gst_event_new_seek (rate, format, flags, cur_type, cur, stop_type, stop);
+ result = gst_element_send_event (element, event);
+
+ return result;
+}
+
+/**
+ * gst_element_get_query_types:
+ * @element: a #GstElement to query
+ *
+ * Get an array of query types from the element.
+ * If the element doesn't implement a query types function,
+ * the query will be forwarded to the peer of a random linked sink pad.
+ *
+ * Returns: An array of #GstQueryType elements that should not
+ * be freed or modified.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+const GstQueryType *
+gst_element_get_query_types (GstElement * element)
+{
+ GstElementClass *oclass;
+ const GstQueryType *result = NULL;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
+
+ oclass = GST_ELEMENT_GET_CLASS (element);
+
+ if (oclass->get_query_types) {
+ result = oclass->get_query_types (element);
+ } else {
+ GstPad *pad = gst_element_get_random_pad (element, TRUE, GST_PAD_SINK);
+
+ if (pad) {
+ GstPad *peer = gst_pad_get_peer (pad);
+
+ if (peer) {
+ result = gst_pad_get_query_types (peer);
+
+ gst_object_unref (peer);
+ }
+ gst_object_unref (pad);
+ }
+ }
+ return result;
+}
+
+static gboolean
+gst_element_default_query (GstElement * element, GstQuery * query)
+{
+ gboolean result = FALSE;
+ GstPad *pad;
+
+ pad = gst_element_get_random_pad (element, FALSE, GST_PAD_SRC);
+ if (pad) {
+ result = gst_pad_query (pad, query);
+
+ gst_object_unref (pad);
+ } else {
+ pad = gst_element_get_random_pad (element, TRUE, GST_PAD_SINK);
+ if (pad) {
+ GstPad *peer = gst_pad_get_peer (pad);
+
+ if (peer) {
+ result = gst_pad_query (peer, query);
+
+ gst_object_unref (peer);
+ }
+ gst_object_unref (pad);
+ }
+ }
+ return result;
+}
+
+/**
+ * gst_element_query:
+ * @element: a #GstElement to perform the query on.
+ * @query: the #GstQuery.
+ *
+ * Performs a query on the given element.
+ *
+ * For elements that don't implement a query handler, this function
+ * forwards the query to a random srcpad or to the peer of a
+ * random linked sinkpad of this element.
+ *
+ * Returns: TRUE if the query could be performed.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_element_query (GstElement * element, GstQuery * query)
+{
+ GstElementClass *oclass;
+ gboolean result = FALSE;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
+ g_return_val_if_fail (query != NULL, FALSE);
+
+ oclass = GST_ELEMENT_GET_CLASS (element);
+
+ if (oclass->query) {
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "send query on element %s",
+ GST_ELEMENT_NAME (element));
+ result = oclass->query (element, query);
+ } else {
+ result = gst_element_default_query (element, query);
+ }
+ return result;
+}
+
+/**
+ * gst_element_post_message:
+ * @element: a #GstElement posting the message
+ * @message: a #GstMessage to post
+ *
+ * Post a message on the element's #GstBus. This function takes ownership of the
+ * message; if you want to access the message after this call, you should add an
+ * additional reference before calling.
+ *
+ * Returns: %TRUE if the message was successfully posted. The function returns
+ * %FALSE if the element did not have a bus.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_element_post_message (GstElement * element, GstMessage * message)
+{
+ GstBus *bus;
+ gboolean result = FALSE;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
+ g_return_val_if_fail (message != NULL, FALSE);
+
+ GST_OBJECT_LOCK (element);
+ bus = element->bus;
+
+ if (G_UNLIKELY (bus == NULL))
+ goto no_bus;
+
+ gst_object_ref (bus);
+ GST_OBJECT_UNLOCK (element);
+
+ /* we release the element lock when posting the message so that any
+ * (synchronous) message handlers can operate on the element */
+ result = gst_bus_post (bus, message);
+ gst_object_unref (bus);
+
+ return result;
+
+ /* ERRORS */
+no_bus:
+ {
+ GST_CAT_DEBUG_OBJECT (GST_CAT_MESSAGE, element,
+ "not posting message %p: no bus", message);
+ GST_OBJECT_UNLOCK (element);
+ gst_message_unref (message);
+ return FALSE;
+ }
+}
+
+/**
+ * _gst_element_error_printf:
+ * @format: the printf-like format to use, or %NULL
+ *
+ * This function is only used internally by the gst_element_error() macro.
+ *
+ * Returns: a newly allocated string, or %NULL if the format was %NULL or ""
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gchar *
+_gst_element_error_printf (const gchar * format, ...)
+{
+ va_list args;
+ gchar *buffer;
+
+ if (format == NULL)
+ return NULL;
+ if (format[0] == 0)
+ return NULL;
+
+ va_start (args, format);
+ buffer = g_strdup_vprintf (format, args);
+ va_end (args);
+ return buffer;
+}
+
+/**
+ * gst_element_message_full:
+ * @element: a #GstElement to send message from
+ * @type: the #GstMessageType
+ * @domain: the GStreamer GError domain this message belongs to
+ * @code: the GError code belonging to the domain
+ * @text: an allocated text string to be used as a replacement for the
+ * default message connected to code, or %NULL
+ * @debug: an allocated debug message to be used as a replacement for the
+ * default debugging information, or %NULL
+ * @file: the source code file where the error was generated
+ * @function: the source code function where the error was generated
+ * @line: the source code line where the error was generated
+ *
+ * Post an error, warning or info message on the bus from inside an element.
+ *
+ * @type must be of #GST_MESSAGE_ERROR, #GST_MESSAGE_WARNING or
+ * #GST_MESSAGE_INFO.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void gst_element_message_full
+ (GstElement * element, GstMessageType type,
+ GQuark domain, gint code, gchar * text,
+ gchar * debug, const gchar * file, const gchar * function, gint line)
+{
+ GError *gerror = NULL;
+ gchar *name;
+ gchar *sent_text;
+ gchar *sent_debug;
+ gboolean has_debug = TRUE;
+ GstMessage *message = NULL;
+
+ /* checks */
+ GST_DEBUG_OBJECT (element, "start");
+ g_return_if_fail (GST_IS_ELEMENT (element));
+ g_return_if_fail ((type == GST_MESSAGE_ERROR) ||
+ (type == GST_MESSAGE_WARNING) || (type == GST_MESSAGE_INFO));
+
+ /* check if we send the given text or the default error text */
+ if ((text == NULL) || (text[0] == 0)) {
+ /* text could have come from g_strdup_printf (""); */
+ g_free (text);
+ sent_text = gst_error_get_message (domain, code);
+ } else
+ sent_text = text;
+
+ /* construct a sent_debug with extra information from source */
+ if ((debug == NULL) || (debug[0] == 0)) {
+ /* debug could have come from g_strdup_printf (""); */
+ has_debug = FALSE;
+ }
+
+ name = gst_object_get_path_string (GST_OBJECT_CAST (element));
+ if (has_debug)
+ sent_debug = g_strdup_printf ("%s(%d): %s (): %s:\n%s",
+ file, line, function, name, debug);
+ else
+ sent_debug = g_strdup_printf ("%s(%d): %s (): %s",
+ file, line, function, name);
+ g_free (name);
+ g_free (debug);
+
+ /* create gerror and post message */
+ GST_CAT_INFO_OBJECT (GST_CAT_ERROR_SYSTEM, element, "posting message: %s",
+ sent_text);
+ gerror = g_error_new_literal (domain, code, sent_text);
+
+ switch (type) {
+ case GST_MESSAGE_ERROR:
+ message =
+ gst_message_new_error (GST_OBJECT_CAST (element), gerror, sent_debug);
+ break;
+ case GST_MESSAGE_WARNING:
+ message = gst_message_new_warning (GST_OBJECT_CAST (element), gerror,
+ sent_debug);
+ break;
+ case GST_MESSAGE_INFO:
+ message = gst_message_new_info (GST_OBJECT_CAST (element), gerror,
+ sent_debug);
+ break;
+ default:
+ g_assert_not_reached ();
+ break;
+ }
+ gst_element_post_message (element, message);
+
+ GST_CAT_INFO_OBJECT (GST_CAT_ERROR_SYSTEM, element, "posted %s message: %s",
+ (type == GST_MESSAGE_ERROR ? "error" : "warning"), sent_text);
+
+ /* cleanup */
+ g_error_free (gerror);
+ g_free (sent_debug);
+ g_free (sent_text);
+}
+
+/**
+ * gst_element_is_locked_state:
+ * @element: a #GstElement.
+ *
+ * Checks if the state of an element is locked.
+ * If the state of an element is locked, state changes of the parent don't
+ * affect the element.
+ * This way you can leave currently unused elements inside bins. Just lock their
+ * state before changing the state from #GST_STATE_NULL.
+ *
+ * MT safe.
+ *
+ * Returns: TRUE, if the element's state is locked.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_element_is_locked_state (GstElement * element)
+{
+ gboolean result;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
+
+ GST_OBJECT_LOCK (element);
+ result = GST_OBJECT_FLAG_IS_SET (element, GST_ELEMENT_LOCKED_STATE);
+ GST_OBJECT_UNLOCK (element);
+
+ return result;
+}
+
+/**
+ * gst_element_set_locked_state:
+ * @element: a #GstElement
+ * @locked_state: TRUE to lock the element's state
+ *
+ * Locks the state of an element, so state changes of the parent don't affect
+ * this element anymore.
+ *
+ * MT safe.
+ *
+ * Returns: TRUE if the state was changed, FALSE if bad parameters were given
+ * or the elements state-locking needed no change.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_element_set_locked_state (GstElement * element, gboolean locked_state)
+{
+ gboolean old;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
+
+ GST_OBJECT_LOCK (element);
+ old = GST_OBJECT_FLAG_IS_SET (element, GST_ELEMENT_LOCKED_STATE);
+
+ if (G_UNLIKELY (old == locked_state))
+ goto was_ok;
+
+ if (locked_state) {
+ GST_CAT_DEBUG (GST_CAT_STATES, "locking state of element %s",
+ GST_ELEMENT_NAME (element));
+ GST_OBJECT_FLAG_SET (element, GST_ELEMENT_LOCKED_STATE);
+ } else {
+ GST_CAT_DEBUG (GST_CAT_STATES, "unlocking state of element %s",
+ GST_ELEMENT_NAME (element));
+ GST_OBJECT_FLAG_UNSET (element, GST_ELEMENT_LOCKED_STATE);
+ }
+ GST_OBJECT_UNLOCK (element);
+
+ return TRUE;
+
+was_ok:
+ {
+ GST_CAT_DEBUG (GST_CAT_STATES, "elements %s was in locked state %d",
+ GST_ELEMENT_NAME (element), old);
+ GST_OBJECT_UNLOCK (element);
+
+ return FALSE;
+ }
+}
+
+/**
+ * gst_element_sync_state_with_parent:
+ * @element: a #GstElement.
+ *
+ * Tries to change the state of the element to the same as its parent.
+ * If this function returns FALSE, the state of element is undefined.
+ *
+ * Returns: TRUE, if the element's state could be synced to the parent's state.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_element_sync_state_with_parent (GstElement * element)
+{
+ GstElement *parent;
+ GstState target;
+ GstStateChangeReturn ret;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
+
+ if ((parent = GST_ELEMENT_CAST (gst_element_get_parent (element)))) {
+ GstState parent_current, parent_pending;
+
+ GST_OBJECT_LOCK (parent);
+ parent_current = GST_STATE (parent);
+ parent_pending = GST_STATE_PENDING (parent);
+ GST_OBJECT_UNLOCK (parent);
+
+ /* set to pending if there is one, else we set it to the current state of
+ * the parent */
+ if (parent_pending != GST_STATE_VOID_PENDING)
+ target = parent_pending;
+ else
+ target = parent_current;
+
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
+ "syncing state (%s) to parent %s %s (%s, %s)",
+ gst_element_state_get_name (GST_STATE (element)),
+ GST_ELEMENT_NAME (parent), gst_element_state_get_name (target),
+ gst_element_state_get_name (parent_current),
+ gst_element_state_get_name (parent_pending));
+
+ ret = gst_element_set_state (element, target);
+ if (ret == GST_STATE_CHANGE_FAILURE)
+ goto failed;
+
+ gst_object_unref (parent);
+
+ return TRUE;
+ } else {
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element, "element has no parent");
+ }
+ return FALSE;
+
+ /* ERROR */
+failed:
+ {
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
+ "syncing state failed (%s)",
+ gst_element_state_change_return_get_name (ret));
+ return FALSE;
+ }
+}
+
+/* MT safe */
+static GstStateChangeReturn
+gst_element_get_state_func (GstElement * element,
+ GstState * state, GstState * pending, GstClockTime timeout)
+{
+ GstStateChangeReturn ret = GST_STATE_CHANGE_FAILURE;
+ GstState old_pending;
+
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element, "getting state, timeout %"
+ GST_TIME_FORMAT, GST_TIME_ARGS (timeout));
+
+ GST_OBJECT_LOCK (element);
+ ret = GST_STATE_RETURN (element);
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element, "RETURN is %s",
+ gst_element_state_change_return_get_name (ret));
+
+ /* we got an error, report immediatly */
+ if (ret == GST_STATE_CHANGE_FAILURE)
+ goto done;
+
+ /* we got no_preroll, report immediatly */
+ if (ret == GST_STATE_CHANGE_NO_PREROLL)
+ goto done;
+
+ /* no need to wait async if we are not async */
+ if (ret != GST_STATE_CHANGE_ASYNC)
+ goto done;
+
+ old_pending = GST_STATE_PENDING (element);
+ if (old_pending != GST_STATE_VOID_PENDING) {
+ GTimeVal *timeval, abstimeout;
+ guint32 cookie;
+
+ if (timeout != GST_CLOCK_TIME_NONE) {
+ glong add = timeout / 1000;
+
+ if (add == 0)
+ goto done;
+
+ /* make timeout absolute */
+ g_get_current_time (&abstimeout);
+ g_time_val_add (&abstimeout, add);
+ timeval = &abstimeout;
+ } else {
+ timeval = NULL;
+ }
+ /* get cookie to dected state change during waiting */
+ cookie = element->state_cookie;
+
+ GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
+ "waiting for element to commit state");
+
+ /* we have a pending state change, wait for it to complete */
+ if (!GST_STATE_TIMED_WAIT (element, timeval)) {
+ GST_CAT_INFO_OBJECT (GST_CAT_STATES, element, "timed out");
+ /* timeout triggered */
+ ret = GST_STATE_CHANGE_ASYNC;
+ } else {
+ if (cookie != element->state_cookie)
+ goto interrupted;
+
+ /* could be success or failure */
+ if (old_pending == GST_STATE (element)) {
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element, "got success");
+ ret = GST_STATE_CHANGE_SUCCESS;
+ } else {
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element, "got failure");
+ ret = GST_STATE_CHANGE_FAILURE;
+ }
+ }
+ /* if nothing is pending anymore we can return SUCCESS */
+ if (GST_STATE_PENDING (element) == GST_STATE_VOID_PENDING) {
+ GST_CAT_LOG_OBJECT (GST_CAT_STATES, element, "nothing pending");
+ ret = GST_STATE_CHANGE_SUCCESS;
+ }
+ }
+
+done:
+ if (state)
+ *state = GST_STATE (element);
+ if (pending)
+ *pending = GST_STATE_PENDING (element);
+
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
+ "state current: %s, pending: %s, result: %s",
+ gst_element_state_get_name (GST_STATE (element)),
+ gst_element_state_get_name (GST_STATE_PENDING (element)),
+ gst_element_state_change_return_get_name (ret));
+ GST_OBJECT_UNLOCK (element);
+
+ return ret;
+
+interrupted:
+ {
+ if (state)
+ *state = GST_STATE_VOID_PENDING;
+ if (pending)
+ *pending = GST_STATE_VOID_PENDING;
+
+ GST_CAT_INFO_OBJECT (GST_CAT_STATES, element, "interruped");
+
+ GST_OBJECT_UNLOCK (element);
+
+ return GST_STATE_CHANGE_FAILURE;
+ }
+}
+
+/**
+ * gst_element_get_state:
+ * @element: a #GstElement to get the state of.
+ * @state: a pointer to #GstState to hold the state. Can be %NULL.
+ * @pending: a pointer to #GstState to hold the pending state.
+ * Can be %NULL.
+ * @timeout: a #GstClockTime to specify the timeout for an async
+ * state change or %GST_CLOCK_TIME_NONE for infinite timeout.
+ *
+ * Gets the state of the element.
+ *
+ * For elements that performed an ASYNC state change, as reported by
+ * gst_element_set_state(), this function will block up to the
+ * specified timeout value for the state change to complete.
+ * If the element completes the state change or goes into
+ * an error, this function returns immediately with a return value of
+ * %GST_STATE_CHANGE_SUCCESS or %GST_STATE_CHANGE_FAILURE respectively.
+ *
+ * For elements that did not return %GST_STATE_CHANGE_ASYNC, this function
+ * returns the current and pending state immediately.
+ *
+ * This function returns %GST_STATE_CHANGE_NO_PREROLL if the element
+ * successfully changed its state but is not able to provide data yet.
+ * This mostly happens for live sources that only produce data in the PLAYING
+ * state. While the state change return is equivalent to
+ * %GST_STATE_CHANGE_SUCCESS, it is returned to the application to signal that
+ * some sink elements might not be able to complete their state change because
+ * an element is not producing data to complete the preroll. When setting the
+ * element to playing, the preroll will complete and playback will start.
+ *
+ * Returns: %GST_STATE_CHANGE_SUCCESS if the element has no more pending state
+ * and the last state change succeeded, %GST_STATE_CHANGE_ASYNC if the
+ * element is still performing a state change or
+ * %GST_STATE_CHANGE_FAILURE if the last state change failed.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstStateChangeReturn
+gst_element_get_state (GstElement * element,
+ GstState * state, GstState * pending, GstClockTime timeout)
+{
+ GstElementClass *oclass;
+ GstStateChangeReturn result = GST_STATE_CHANGE_FAILURE;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), GST_STATE_CHANGE_FAILURE);
+
+ oclass = GST_ELEMENT_GET_CLASS (element);
+
+ if (oclass->get_state)
+ result = (oclass->get_state) (element, state, pending, timeout);
+
+ return result;
+}
+
+/**
+ * gst_element_abort_state:
+ * @element: a #GstElement to abort the state of.
+ *
+ * Abort the state change of the element. This function is used
+ * by elements that do asynchronous state changes and find out
+ * something is wrong.
+ *
+ * This function should be called with the STATE_LOCK held.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_element_abort_state (GstElement * element)
+{
+ GstState pending;
+
+#ifndef GST_DISABLE_GST_DEBUG
+ GstState old_state;
+#endif
+
+ g_return_if_fail (GST_IS_ELEMENT (element));
+
+ GST_OBJECT_LOCK (element);
+ pending = GST_STATE_PENDING (element);
+
+ if (pending == GST_STATE_VOID_PENDING ||
+ GST_STATE_RETURN (element) == GST_STATE_CHANGE_FAILURE)
+ goto nothing_aborted;
+
+#ifndef GST_DISABLE_GST_DEBUG
+ old_state = GST_STATE (element);
+
+ GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
+ "aborting state from %s to %s", gst_element_state_get_name (old_state),
+ gst_element_state_get_name (pending));
+#endif
+
+ /* flag error */
+ GST_STATE_RETURN (element) = GST_STATE_CHANGE_FAILURE;
+
+ GST_STATE_BROADCAST (element);
+ GST_OBJECT_UNLOCK (element);
+
+ return;
+
+nothing_aborted:
+ {
+ GST_OBJECT_UNLOCK (element);
+ return;
+ }
+}
+
+/**
+ * gst_element_continue_state:
+ * @element: a #GstElement to continue the state change of.
+ * @ret: The previous state return value
+ *
+ * Commit the state change of the element and proceed to the next
+ * pending state if any. This function is used
+ * by elements that do asynchronous state changes.
+ * The core will normally call this method automatically when an
+ * element returned %GST_STATE_CHANGE_SUCCESS from the state change function.
+ *
+ * If after calling this method the element still has not reached
+ * the pending state, the next state change is performed.
+ *
+ * This method is used internally and should normally not be called by plugins
+ * or applications.
+ *
+ * Returns: The result of the commit state change.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstStateChangeReturn
+gst_element_continue_state (GstElement * element, GstStateChangeReturn ret)
+{
+ GstStateChangeReturn old_ret;
+ GstState old_state, old_next;
+ GstState current, next, pending;
+ GstMessage *message;
+ GstStateChange transition;
+
+ GST_OBJECT_LOCK (element);
+ old_ret = GST_STATE_RETURN (element);
+ GST_STATE_RETURN (element) = ret;
+ pending = GST_STATE_PENDING (element);
+
+ /* check if there is something to commit */
+ if (pending == GST_STATE_VOID_PENDING)
+ goto nothing_pending;
+
+ old_state = GST_STATE (element);
+ /* this is the state we should go to next */
+ old_next = GST_STATE_NEXT (element);
+ /* update current state */
+ current = GST_STATE (element) = old_next;
+
+ /* see if we reached the final state */
+ if (pending == current)
+ goto complete;
+
+ next = GST_STATE_GET_NEXT (current, pending);
+ transition = (GstStateChange) GST_STATE_TRANSITION (current, next);
+
+ GST_STATE_NEXT (element) = next;
+ /* mark busy */
+ GST_STATE_RETURN (element) = GST_STATE_CHANGE_ASYNC;
+ GST_OBJECT_UNLOCK (element);
+
+ GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
+ "committing state from %s to %s, pending %s",
+ gst_element_state_get_name (old_state),
+ gst_element_state_get_name (old_next),
+ gst_element_state_get_name (pending));
+
+ message = gst_message_new_state_changed (GST_OBJECT_CAST (element),
+ old_state, old_next, pending);
+ gst_element_post_message (element, message);
+
+ GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
+ "continue state change %s to %s, final %s",
+ gst_element_state_get_name (current),
+ gst_element_state_get_name (next), gst_element_state_get_name (pending));
+
+ ret = gst_element_change_state (element, transition);
+
+ return ret;
+
+nothing_pending:
+ {
+ GST_CAT_INFO_OBJECT (GST_CAT_STATES, element, "nothing pending");
+ GST_OBJECT_UNLOCK (element);
+ return ret;
+ }
+complete:
+ {
+ GST_STATE_PENDING (element) = GST_STATE_VOID_PENDING;
+ GST_STATE_NEXT (element) = GST_STATE_VOID_PENDING;
+
+ GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
+ "completed state change to %s", gst_element_state_get_name (pending));
+ GST_OBJECT_UNLOCK (element);
+
+ /* don't post silly messages with the same state. This can happen
+ * when an element state is changed to what it already was. For bins
+ * this can be the result of a lost state, which we check with the
+ * previous return value.
+ * We do signal the cond though as a _get_state() might be blocking
+ * on it. */
+ if (old_state != old_next || old_ret == GST_STATE_CHANGE_ASYNC) {
+ GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
+ "posting state-changed %s to %s",
+ gst_element_state_get_name (old_state),
+ gst_element_state_get_name (old_next));
+ message =
+ gst_message_new_state_changed (GST_OBJECT_CAST (element), old_state,
+ old_next, GST_STATE_VOID_PENDING);
+ gst_element_post_message (element, message);
+ }
+
+ GST_STATE_BROADCAST (element);
+
+ return ret;
+ }
+}
+
+/**
+ * gst_element_lost_state:
+ * @element: a #GstElement the state is lost of
+ *
+ * Brings the element to the lost state. The current state of the
+ * element is copied to the pending state so that any call to
+ * gst_element_get_state() will return %GST_STATE_CHANGE_ASYNC.
+ *
+ * An ASYNC_START message is posted with an indication to distribute a new
+ * base_time to the element.
+ * If the element was PLAYING, it will go to PAUSED. The element
+ * will be restored to its PLAYING state by the parent pipeline when it
+ * prerolls again.
+ *
+ * This is mostly used for elements that lost their preroll buffer
+ * in the %GST_STATE_PAUSED or %GST_STATE_PLAYING state after a flush,
+ * they will go to their pending state again when a new preroll buffer is
+ * queued. This function can only be called when the element is currently
+ * not in error or an async state change.
+ *
+ * This function is used internally and should normally not be called from
+ * plugins or applications.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_element_lost_state (GstElement * element)
+{
+ GstState old_state, new_state;
+ GstMessage *message;
+
+ g_return_if_fail (GST_IS_ELEMENT (element));
+
+ GST_OBJECT_LOCK (element);
+ if (GST_STATE_PENDING (element) != GST_STATE_VOID_PENDING ||
+ GST_STATE_RETURN (element) == GST_STATE_CHANGE_FAILURE)
+ goto nothing_lost;
+
+ old_state = GST_STATE (element);
+
+ /* when we were PLAYING, the new state is PAUSED. We will also not
+ * automatically go to PLAYING but let the parent bin(s) set us to PLAYING
+ * when we preroll. */
+ if (old_state > GST_STATE_PAUSED)
+ new_state = GST_STATE_PAUSED;
+ else
+ new_state = old_state;
+
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
+ "lost state of %s to %s", gst_element_state_get_name (old_state),
+ gst_element_state_get_name (new_state));
+
+ GST_STATE (element) = new_state;
+ GST_STATE_NEXT (element) = new_state;
+ GST_STATE_PENDING (element) = new_state;
+ GST_STATE_RETURN (element) = GST_STATE_CHANGE_ASYNC;
+ GST_OBJECT_UNLOCK (element);
+
+ message = gst_message_new_state_changed (GST_OBJECT_CAST (element),
+ new_state, new_state, new_state);
+ gst_element_post_message (element, message);
+
+ message = gst_message_new_async_start (GST_OBJECT_CAST (element), TRUE);
+ gst_element_post_message (element, message);
+
+ return;
+
+nothing_lost:
+ {
+ GST_OBJECT_UNLOCK (element);
+ return;
+ }
+}
+
+/**
+ * gst_element_set_state:
+ * @element: a #GstElement to change state of.
+ * @state: the element's new #GstState.
+ *
+ * Sets the state of the element. This function will try to set the
+ * requested state by going through all the intermediary states and calling
+ * the class's state change function for each.
+ *
+ * This function can return #GST_STATE_CHANGE_ASYNC, in which case the
+ * element will perform the remainder of the state change asynchronously in
+ * another thread.
+ * An application can use gst_element_get_state() to wait for the completion
+ * of the state change or it can wait for a state change message on the bus.
+ *
+ * Returns: Result of the state change using #GstStateChangeReturn.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstStateChangeReturn
+gst_element_set_state (GstElement * element, GstState state)
+{
+ GstElementClass *oclass;
+ GstStateChangeReturn result = GST_STATE_CHANGE_FAILURE;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), GST_STATE_CHANGE_FAILURE);
+
+ oclass = GST_ELEMENT_GET_CLASS (element);
+
+ if (oclass->set_state)
+ result = (oclass->set_state) (element, state);
+
+ return result;
+}
+
+/*
+ * default set state function, calculates the next state based
+ * on current state and calls the change_state function
+ */
+static GstStateChangeReturn
+gst_element_set_state_func (GstElement * element, GstState state)
+{
+ GstState current, next, old_pending;
+ GstStateChangeReturn ret;
+ GstStateChange transition;
+ GstStateChangeReturn old_ret;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), GST_STATE_CHANGE_FAILURE);
+
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element, "set_state to %s",
+ gst_element_state_get_name (state));
+
+ /* state lock is taken to protect the set_state() and get_state()
+ * procedures, it does not lock any variables. */
+ GST_STATE_LOCK (element);
+
+ /* now calculate how to get to the new state */
+ GST_OBJECT_LOCK (element);
+ old_ret = GST_STATE_RETURN (element);
+ /* previous state change returned an error, remove all pending
+ * and next states */
+ if (old_ret == GST_STATE_CHANGE_FAILURE) {
+ GST_STATE_NEXT (element) = GST_STATE_VOID_PENDING;
+ GST_STATE_PENDING (element) = GST_STATE_VOID_PENDING;
+ GST_STATE_RETURN (element) = GST_STATE_CHANGE_SUCCESS;
+ }
+
+ current = GST_STATE (element);
+ next = GST_STATE_NEXT (element);
+ old_pending = GST_STATE_PENDING (element);
+
+ /* this is the (new) state we should go to. TARGET is the last state we set on
+ * the element. */
+ if (state != GST_STATE_TARGET (element)) {
+ GST_STATE_TARGET (element) = state;
+ /* increment state cookie so that we can track each state change. We only do
+ * this if this is actually a new state change. */
+ element->state_cookie++;
+ }
+ GST_STATE_PENDING (element) = state;
+
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
+ "current %s, old_pending %s, next %s, old return %s",
+ gst_element_state_get_name (current),
+ gst_element_state_get_name (old_pending),
+ gst_element_state_get_name (next),
+ gst_element_state_change_return_get_name (old_ret));
+
+ /* if the element was busy doing a state change, we just update the
+ * target state, it'll get to it async then. */
+ if (old_pending != GST_STATE_VOID_PENDING) {
+ /* upwards state change will happen ASYNC */
+ if (old_pending <= state)
+ goto was_busy;
+ /* element is going to this state already */
+ else if (next == state)
+ goto was_busy;
+ /* element was performing an ASYNC upward state change and
+ * we request to go downward again. Start from the next pending
+ * state then. */
+ else if (next > state
+ && GST_STATE_RETURN (element) == GST_STATE_CHANGE_ASYNC) {
+ current = next;
+ }
+ }
+ next = GST_STATE_GET_NEXT (current, state);
+ /* now we store the next state */
+ GST_STATE_NEXT (element) = next;
+ /* mark busy, we need to check that there is actually a state change
+ * to be done else we could accidentally override SUCCESS/NO_PREROLL and
+ * the default element change_state function has no way to know what the
+ * old value was... could consider this a FIXME...*/
+ if (current != next)
+ GST_STATE_RETURN (element) = GST_STATE_CHANGE_ASYNC;
+
+ transition = (GstStateChange) GST_STATE_TRANSITION (current, next);
+
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
+ "%s: setting state from %s to %s",
+ (next != state ? "intermediate" : "final"),
+ gst_element_state_get_name (current), gst_element_state_get_name (next));
+
+ /* now signal any waiters, they will error since the cookie was incremented */
+ GST_STATE_BROADCAST (element);
+
+ GST_OBJECT_UNLOCK (element);
+
+ ret = gst_element_change_state (element, transition);
+
+ GST_STATE_UNLOCK (element);
+
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element, "returned %s",
+ gst_element_state_change_return_get_name (ret));
+
+ return ret;
+
+was_busy:
+ {
+ GST_STATE_RETURN (element) = GST_STATE_CHANGE_ASYNC;
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
+ "element was busy with async state change");
+ GST_OBJECT_UNLOCK (element);
+
+ GST_STATE_UNLOCK (element);
+
+ return GST_STATE_CHANGE_ASYNC;
+ }
+}
+
+/**
+ * gst_element_change_state:
+ * @element: a #GstElement
+ * @transition: the requested transition
+ *
+ * Perform @transition on @element.
+ *
+ * This function must be called with STATE_LOCK held and is mainly used
+ * internally.
+ *
+ * Returns: the #GstStateChangeReturn of the state transition.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstStateChangeReturn
+gst_element_change_state (GstElement * element, GstStateChange transition)
+{
+ GstElementClass *oclass;
+ GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
+ GstState current;
+ GstState next;
+
+ oclass = GST_ELEMENT_GET_CLASS (element);
+
+ /* start with the current state. */
+ current = (GstState) GST_STATE_TRANSITION_CURRENT (transition);
+ next = GST_STATE_TRANSITION_NEXT (transition);
+
+ /* call the state change function so it can set the state */
+ if (oclass->change_state)
+ ret = (oclass->change_state) (element, transition);
+ else
+ ret = GST_STATE_CHANGE_FAILURE;
+
+ switch (ret) {
+ case GST_STATE_CHANGE_FAILURE:
+ GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
+ "have FAILURE change_state return");
+ /* state change failure */
+ gst_element_abort_state (element);
+ break;
+ case GST_STATE_CHANGE_ASYNC:
+ {
+ GstState target;
+
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
+ "element will change state ASYNC");
+
+ target = GST_STATE_TARGET (element);
+
+ if (target > GST_STATE_READY)
+ goto async;
+
+ /* else we just continue the state change downwards */
+ GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
+ "forcing commit state %s <= %s",
+ gst_element_state_get_name (target),
+ gst_element_state_get_name (GST_STATE_READY));
+
+ ret = gst_element_continue_state (element, GST_STATE_CHANGE_SUCCESS);
+ break;
+ }
+ case GST_STATE_CHANGE_SUCCESS:
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
+ "element changed state SUCCESS");
+ /* we can commit the state now which will proceeed to
+ * the next state */
+ ret = gst_element_continue_state (element, ret);
+ break;
+ case GST_STATE_CHANGE_NO_PREROLL:
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
+ "element changed state NO_PREROLL");
+ /* we can commit the state now which will proceeed to
+ * the next state */
+ ret = gst_element_continue_state (element, ret);
+ break;
+ default:
+ goto invalid_return;
+ }
+
+ GST_CAT_LOG_OBJECT (GST_CAT_STATES, element, "exit state change %d", ret);
+
+ return ret;
+
+async:
+ GST_CAT_LOG_OBJECT (GST_CAT_STATES, element, "exit async state change %d",
+ ret);
+
+ return ret;
+
+ /* ERROR */
+invalid_return:
+ {
+ GST_OBJECT_LOCK (element);
+ /* somebody added a GST_STATE_ and forgot to do stuff here ! */
+ g_critical ("%s: unknown return value %d from a state change function",
+ GST_ELEMENT_NAME (element), ret);
+
+ /* we are in error now */
+ ret = GST_STATE_CHANGE_FAILURE;
+ GST_STATE_RETURN (element) = ret;
+ GST_OBJECT_UNLOCK (element);
+
+ return ret;
+ }
+}
+
+/* gst_iterator_fold functions for pads_activate
+ * Note how we don't stop the iterator when we fail an activation. This is
+ * probably a FIXME since when one pad activation fails, we don't want to
+ * continue our state change. */
+static gboolean
+activate_pads (GstPad * pad, GValue * ret, gboolean * active)
+{
+ if (!gst_pad_set_active (pad, *active))
+ g_value_set_boolean (ret, FALSE);
+
+ /* unref the object that was reffed for us by _fold */
+ gst_object_unref (pad);
+ return TRUE;
+}
+
+/* set the caps on the pad to NULL */
+static gboolean
+clear_caps (GstPad * pad, GValue * ret, gboolean * active)
+{
+ gst_pad_set_caps (pad, NULL);
+ gst_object_unref (pad);
+ return TRUE;
+}
+
+/* returns false on error or early cutout (will never happen because the fold
+ * function always returns TRUE, see FIXME above) of the fold, true if all
+ * pads in @iter were (de)activated successfully. */
+static gboolean
+iterator_activate_fold_with_resync (GstIterator * iter,
+ GstIteratorFoldFunction func, gpointer user_data)
+{
+ GstIteratorResult ires;
+ GValue ret = { 0 };
+
+ /* no need to unset this later, it's just a boolean */
+ g_value_init (&ret, G_TYPE_BOOLEAN);
+ g_value_set_boolean (&ret, TRUE);
+
+ while (1) {
+ ires = gst_iterator_fold (iter, func, &ret, user_data);
+ switch (ires) {
+ case GST_ITERATOR_RESYNC:
+ /* need to reset the result again */
+ g_value_set_boolean (&ret, TRUE);
+ gst_iterator_resync (iter);
+ break;
+ case GST_ITERATOR_DONE:
+ /* all pads iterated, return collected value */
+ goto done;
+ default:
+ /* iterator returned _ERROR or premature end with _OK,
+ * mark an error and exit */
+ g_value_set_boolean (&ret, FALSE);
+ goto done;
+ }
+ }
+done:
+ /* return collected value */
+ return g_value_get_boolean (&ret);
+}
+
+/* is called with STATE_LOCK
+ *
+ * Pads are activated from source pads to sinkpads.
+ */
+static gboolean
+gst_element_pads_activate (GstElement * element, gboolean active)
+{
+ GstIterator *iter;
+ gboolean res;
+
+ GST_CAT_DEBUG_OBJECT (GST_CAT_ELEMENT_PADS, element,
+ "pads_activate with active %d", active);
+
+ iter = gst_element_iterate_src_pads (element);
+ res =
+ iterator_activate_fold_with_resync (iter,
+ (GstIteratorFoldFunction) activate_pads, &active);
+ gst_iterator_free (iter);
+ if (G_UNLIKELY (!res))
+ goto src_failed;
+
+ iter = gst_element_iterate_sink_pads (element);
+ res =
+ iterator_activate_fold_with_resync (iter,
+ (GstIteratorFoldFunction) activate_pads, &active);
+ gst_iterator_free (iter);
+ if (G_UNLIKELY (!res))
+ goto sink_failed;
+
+ if (!active) {
+ /* clear the caps on all pads, this should never fail */
+ iter = gst_element_iterate_pads (element);
+ res =
+ iterator_activate_fold_with_resync (iter,
+ (GstIteratorFoldFunction) clear_caps, &active);
+ gst_iterator_free (iter);
+ if (G_UNLIKELY (!res))
+ goto caps_failed;
+ }
+
+ GST_CAT_DEBUG_OBJECT (GST_CAT_ELEMENT_PADS, element,
+ "pads_activate successful");
+
+ return TRUE;
+
+ /* ERRORS */
+src_failed:
+ {
+ GST_DEBUG_OBJECT (element, "source pads_activate failed");
+ return FALSE;
+ }
+sink_failed:
+ {
+ GST_DEBUG_OBJECT (element, "sink pads_activate failed");
+ return FALSE;
+ }
+caps_failed:
+ {
+ GST_DEBUG_OBJECT (element, "failed to clear caps on pads");
+ return FALSE;
+ }
+}
+
+/* is called with STATE_LOCK */
+static GstStateChangeReturn
+gst_element_change_state_func (GstElement * element, GstStateChange transition)
+{
+ GstState state, next;
+ GstStateChangeReturn result = GST_STATE_CHANGE_SUCCESS;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), GST_STATE_CHANGE_FAILURE);
+
+ state = (GstState) GST_STATE_TRANSITION_CURRENT (transition);
+ next = GST_STATE_TRANSITION_NEXT (transition);
+
+ /* if the element already is in the given state, we just return success */
+ if (next == GST_STATE_VOID_PENDING || state == next)
+ goto was_ok;
+
+ GST_CAT_LOG_OBJECT (GST_CAT_STATES, element,
+ "default handler tries setting state from %s to %s (%04x)",
+ gst_element_state_get_name (state),
+ gst_element_state_get_name (next), transition);
+
+ switch (transition) {
+ case GST_STATE_CHANGE_NULL_TO_READY:
+ break;
+ case GST_STATE_CHANGE_READY_TO_PAUSED:
+ if (!gst_element_pads_activate (element, TRUE)) {
+ result = GST_STATE_CHANGE_FAILURE;
+ }
+ break;
+ case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
+ break;
+ case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
+ break;
+ case GST_STATE_CHANGE_PAUSED_TO_READY:
+ case GST_STATE_CHANGE_READY_TO_NULL:
+ /* deactivate pads in both cases, since they are activated on
+ ready->paused but the element might not have made it to paused */
+ if (!gst_element_pads_activate (element, FALSE)) {
+ result = GST_STATE_CHANGE_FAILURE;
+ } else {
+ gst_element_set_base_time (element, 0);
+ }
+ break;
+ default:
+ /* this will catch real but unhandled state changes;
+ * can only be caused by:
+ * - a new state was added
+ * - somehow the element was asked to jump across an intermediate state
+ */
+ g_warning ("Unhandled state change from %s to %s",
+ gst_element_state_get_name (state),
+ gst_element_state_get_name (next));
+ break;
+ }
+ return result;
+
+was_ok:
+ {
+ GST_OBJECT_LOCK (element);
+ result = GST_STATE_RETURN (element);
+ GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
+ "element is already in the %s state",
+ gst_element_state_get_name (state));
+ GST_OBJECT_UNLOCK (element);
+
+ return result;
+ }
+}
+
+/**
+ * gst_element_get_factory:
+ * @element: a #GstElement to request the element factory of.
+ *
+ * Retrieves the factory that was used to create this element.
+ *
+ * Returns: the #GstElementFactory used for creating this element.
+ * no refcounting is needed.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstElementFactory *
+gst_element_get_factory (GstElement * element)
+{
+ g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
+
+ return GST_ELEMENT_GET_CLASS (element)->elementfactory;
+}
+
+static void
+gst_element_dispose (GObject * object)
+{
+ GstElement *element = GST_ELEMENT (object);
+ GstClock **clock_p;
+ GstBus **bus_p;
+
+ GST_CAT_INFO_OBJECT (GST_CAT_REFCOUNTING, element, "dispose");
+
+ if (GST_STATE (element) != GST_STATE_NULL)
+ goto not_null;
+
+ GST_CAT_DEBUG_OBJECT (GST_CAT_ELEMENT_PADS, element,
+ "removing %d pads", g_list_length (element->pads));
+ /* first we break all our links with the outside */
+ while (element->pads && element->pads->data) {
+ /* don't call _remove_pad with NULL */
+ gst_element_remove_pad (element, GST_PAD_CAST (element->pads->data));
+ }
+ if (G_UNLIKELY (element->pads != 0)) {
+ g_critical ("could not remove pads from element %s",
+ GST_STR_NULL (GST_OBJECT_NAME (object)));
+ }
+
+ GST_OBJECT_LOCK (element);
+ clock_p = &element->clock;
+ bus_p = &element->bus;
+ gst_object_replace ((GstObject **) clock_p, NULL);
+ gst_object_replace ((GstObject **) bus_p, NULL);
+ GST_OBJECT_UNLOCK (element);
+
+ GST_CAT_INFO_OBJECT (GST_CAT_REFCOUNTING, element, "parent class dispose");
+
+ G_OBJECT_CLASS (parent_class)->dispose (object);
+
+ return;
+
+ /* ERRORS */
+not_null:
+ {
+ g_critical
+ ("\nTrying to dispose element %s, but it is not in the NULL state.\n"
+ "You need to explicitly set elements to the NULL state before\n"
+ "dropping the final reference, to allow them to clean up.\n",
+ GST_OBJECT_NAME (element));
+ return;
+ }
+}
+
+static void
+gst_element_finalize (GObject * object)
+{
+ GstElement *element = GST_ELEMENT (object);
+
+ GST_CAT_INFO_OBJECT (GST_CAT_REFCOUNTING, element, "finalize");
+
+ GST_STATE_LOCK (element);
+ if (element->state_cond)
+ g_cond_free (element->state_cond);
+ element->state_cond = NULL;
+ GST_STATE_UNLOCK (element);
+ g_static_rec_mutex_free (element->state_lock);
+ g_free (element->state_lock);
+ element->state_lock = NULL;
+
+ GST_CAT_INFO_OBJECT (GST_CAT_REFCOUNTING, element, "finalize parent");
+
+ G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+#ifndef GST_DISABLE_LOADSAVE
+/**
+ * gst_element_save_thyself:
+ * @element: a #GstElement to save.
+ * @parent: the xml parent node.
+ *
+ * Saves the element as part of the given XML structure.
+ *
+ * Returns: the new #xmlNodePtr.
+ */
+static xmlNodePtr
+gst_element_save_thyself (GstObject * object, xmlNodePtr parent)
+{
+ GList *pads;
+ GstElementClass *oclass;
+ GParamSpec **specs, *spec;
+ guint nspecs;
+ guint i;
+ GValue value = { 0, };
+ GstElement *element;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (object), parent);
+
+ element = GST_ELEMENT (object);
+
+ oclass = GST_ELEMENT_GET_CLASS (element);
+
+ xmlNewChild (parent, NULL, (xmlChar *) "name",
+ (xmlChar *) GST_ELEMENT_NAME (element));
+
+ if (oclass->elementfactory != NULL) {
+ GstElementFactory *factory = (GstElementFactory *) oclass->elementfactory;
+
+ xmlNewChild (parent, NULL, (xmlChar *) "type",
+ (xmlChar *) GST_PLUGIN_FEATURE (factory)->name);
+ }
+
+ /* params */
+ specs = g_object_class_list_properties (G_OBJECT_GET_CLASS (object), &nspecs);
+
+ for (i = 0; i < nspecs; i++) {
+ spec = specs[i];
+ if (spec->flags & G_PARAM_READABLE) {
+ xmlNodePtr param;
+ char *contents;
+
+ g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (spec));
+
+ g_object_get_property (G_OBJECT (element), spec->name, &value);
+ param = xmlNewChild (parent, NULL, (xmlChar *) "param", NULL);
+ xmlNewChild (param, NULL, (xmlChar *) "name", (xmlChar *) spec->name);
+
+ if (G_IS_PARAM_SPEC_STRING (spec))
+ contents = g_value_dup_string (&value);
+ else if (G_IS_PARAM_SPEC_ENUM (spec))
+ contents = g_strdup_printf ("%d", g_value_get_enum (&value));
+ else if (G_IS_PARAM_SPEC_INT64 (spec))
+ contents = g_strdup_printf ("%" G_GINT64_FORMAT,
+ g_value_get_int64 (&value));
+ else
+ contents = g_strdup_value_contents (&value);
+
+ xmlNewChild (param, NULL, (xmlChar *) "value", (xmlChar *) contents);
+ g_free (contents);
+
+ g_value_unset (&value);
+ }
+ }
+
+ g_free (specs);
+
+ pads = GST_ELEMENT_PADS (element);
+
+ while (pads) {
+ GstPad *pad = GST_PAD_CAST (pads->data);
+
+ /* figure out if it's a direct pad or a ghostpad */
+ if (GST_ELEMENT (GST_OBJECT_PARENT (pad)) == element) {
+ xmlNodePtr padtag = xmlNewChild (parent, NULL, (xmlChar *) "pad", NULL);
+
+ gst_object_save_thyself (GST_OBJECT_CAST (pad), padtag);
+ }
+ pads = g_list_next (pads);
+ }
+
+ return parent;
+}
+
+static void
+gst_element_restore_thyself (GstObject * object, xmlNodePtr self)
+{
+ xmlNodePtr children;
+ GstElement *element;
+ gchar *name = NULL;
+ gchar *value = NULL;
+
+ element = GST_ELEMENT (object);
+ g_return_if_fail (element != NULL);
+
+ /* parameters */
+ children = self->xmlChildrenNode;
+ while (children) {
+ if (!strcmp ((char *) children->name, "param")) {
+ xmlNodePtr child = children->xmlChildrenNode;
+
+ while (child) {
+ if (!strcmp ((char *) child->name, "name")) {
+ name = (gchar *) xmlNodeGetContent (child);
+ } else if (!strcmp ((char *) child->name, "value")) {
+ value = (gchar *) xmlNodeGetContent (child);
+ }
+ child = child->next;
+ }
+ /* FIXME: can this just be g_object_set ? */
+ gst_util_set_object_arg (G_OBJECT (element), name, value);
+ /* g_object_set (G_OBJECT (element), name, value, NULL); */
+ g_free (name);
+ g_free (value);
+ }
+ children = children->next;
+ }
+
+ /* pads */
+ children = self->xmlChildrenNode;
+ while (children) {
+ if (!strcmp ((char *) children->name, "pad")) {
+ gst_pad_load_and_link (children, GST_OBJECT_CAST (element));
+ }
+ children = children->next;
+ }
+
+ if (GST_OBJECT_CLASS (parent_class)->restore_thyself)
+ (GST_OBJECT_CLASS (parent_class)->restore_thyself) (object, self);
+}
+#endif /* GST_DISABLE_LOADSAVE */
+
+static void
+gst_element_set_bus_func (GstElement * element, GstBus * bus)
+{
+ GstBus **bus_p;
+
+ g_return_if_fail (GST_IS_ELEMENT (element));
+
+ GST_CAT_DEBUG_OBJECT (GST_CAT_PARENTAGE, element, "setting bus to %p", bus);
+
+ GST_OBJECT_LOCK (element);
+ bus_p = &GST_ELEMENT_BUS (element);
+ gst_object_replace ((GstObject **) bus_p, GST_OBJECT_CAST (bus));
+ GST_OBJECT_UNLOCK (element);
+}
+
+/**
+ * gst_element_set_bus:
+ * @element: a #GstElement to set the bus of.
+ * @bus: the #GstBus to set.
+ *
+ * Sets the bus of the element. Increases the refcount on the bus.
+ * For internal use only, unless you're testing elements.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_element_set_bus (GstElement * element, GstBus * bus)
+{
+ GstElementClass *oclass;
+
+ g_return_if_fail (GST_IS_ELEMENT (element));
+
+ oclass = GST_ELEMENT_GET_CLASS (element);
+
+ if (oclass->set_bus)
+ oclass->set_bus (element, bus);
+}
+
+/**
+ * gst_element_get_bus:
+ * @element: a #GstElement to get the bus of.
+ *
+ * Returns the bus of the element. Note that only a #GstPipeline will provide a
+ * bus for the application.
+ *
+ * Returns: the element's #GstBus. unref after usage.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstBus *
+gst_element_get_bus (GstElement * element)
+{
+ GstBus *result = NULL;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), result);
+
+ GST_OBJECT_LOCK (element);
+ if ((result = GST_ELEMENT_BUS (element)))
+ gst_object_ref (result);
+ GST_OBJECT_UNLOCK (element);
+
+ GST_CAT_DEBUG_OBJECT (GST_CAT_BUS, element, "got bus %" GST_PTR_FORMAT,
+ result);
+
+ return result;
+}