FCL/sf/mw/gstreamer: comparison gstreamer

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--1:000000000000
+:0e761a78d257
+/* 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 &lt;joe.blogs at foo.com&gt;"
+*
+* 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;
+}

changeset 0	0e761a78d257
child 8	4a7fac7dd34a
child 29	567bb019e3e3