--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/gstreamer_core/gst/gstelement.h Thu Dec 17 08:53:32 2009 +0200
@@ -0,0 +1,833 @@
+/* GStreamer
+ * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
+ * 2000,2004 Wim Taymans <wim@fluendo.com>
+ *
+ * gstelement.h: Header for GstElement
+ *
+ * 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.
+ */
+
+
+#ifndef __GST_ELEMENT_H__
+#define __GST_ELEMENT_H__
+
+/* gstelement.h and gstelementfactory.h include eachother */
+typedef struct _GstElement GstElement;
+typedef struct _GstElementClass GstElementClass;
+
+/* gstmessage.h needs State */
+/**
+ * GstState:
+ * @GST_STATE_VOID_PENDING : no pending state.
+ * @GST_STATE_NULL : the NULL state or initial state of an element
+ * @GST_STATE_READY : the element is ready to go to PAUSED
+ * @GST_STATE_PAUSED : the element is PAUSED
+ * @GST_STATE_PLAYING : the element is PLAYING
+ *
+ * The posible states an element can be in.
+ */
+typedef enum {
+ GST_STATE_VOID_PENDING = 0,
+ GST_STATE_NULL = 1,
+ GST_STATE_READY = 2,
+ GST_STATE_PAUSED = 3,
+ GST_STATE_PLAYING = 4
+} GstState;
+
+
+#include <gst/gstconfig.h>
+#include <gst/gstobject.h>
+#include <gst/gstpad.h>
+#include <gst/gstbus.h>
+#include <gst/gstclock.h>
+#include <gst/gstelementfactory.h>
+#include <gst/gstplugin.h>
+#include <gst/gstpluginfeature.h>
+#include <gst/gstindex.h>
+#include <gst/gstindexfactory.h>
+#include <gst/gstiterator.h>
+#include <gst/gstmessage.h>
+#include <gst/gsttaglist.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_ELEMENT (gst_element_get_type ())
+#define GST_IS_ELEMENT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_ELEMENT))
+#define GST_IS_ELEMENT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_ELEMENT))
+#define GST_ELEMENT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_ELEMENT, GstElementClass))
+#define GST_ELEMENT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_ELEMENT, GstElement))
+#define GST_ELEMENT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_ELEMENT, GstElementClass))
+#define GST_ELEMENT_CAST(obj) ((GstElement*)(obj))
+
+/**
+ * GstStateChangeReturn:
+ * @GST_STATE_CHANGE_FAILURE : the state change failed
+ * @GST_STATE_CHANGE_SUCCESS : the state change succeeded
+ * @GST_STATE_CHANGE_ASYNC : the state change will happen asynchronously
+ * @GST_STATE_CHANGE_NO_PREROLL: the state change succeeded but the element
+ * cannot produce data in PAUSED. This typically
+ * happens with live sources.
+ *
+ * The possible return values from a state change function. Only
+ * @GST_STATE_CHANGE_FAILURE is a real failure.
+ */
+typedef enum {
+ GST_STATE_CHANGE_FAILURE = 0,
+ GST_STATE_CHANGE_SUCCESS = 1,
+ GST_STATE_CHANGE_ASYNC = 2,
+ GST_STATE_CHANGE_NO_PREROLL = 3
+} GstStateChangeReturn;
+
+/* NOTE: this probably should be done with an #ifdef to decide
+ * whether to safe-cast or to just do the non-checking cast.
+ */
+
+/**
+ * GST_STATE:
+ * @elem: a #GstElement to return state for.
+ *
+ * This macro returns the current #GstState of the element.
+ */
+#define GST_STATE(elem) (GST_ELEMENT_CAST(elem)->current_state)
+
+/**
+ * GST_STATE_NEXT:
+ * @elem: a #GstElement to return the next state for.
+ *
+ * This macro returns the next #GstState of the element.
+ */
+#define GST_STATE_NEXT(elem) (GST_ELEMENT_CAST(elem)->next_state)
+
+/**
+ * GST_STATE_PENDING:
+ * @elem: a #GstElement to return the pending state for.
+ *
+ * This macro returns the currently pending #GstState of the element.
+ */
+#define GST_STATE_PENDING(elem) (GST_ELEMENT_CAST(elem)->pending_state)
+
+/**
+ * GST_STATE_TARGET:
+ * @elem: a #GstElement to return the target state for.
+ *
+ * This macro returns the target #GstState of the element.
+ *
+ * Since: 0.10.13
+ */
+#define GST_STATE_TARGET(elem) (GST_ELEMENT_CAST(elem)->abidata.ABI.target_state)
+
+/**
+ * GST_STATE_RETURN:
+ * @elem: a #GstElement to return the last state result for.
+ *
+ * This macro returns the last #GstStateChangeReturn value.
+ */
+#define GST_STATE_RETURN(elem) (GST_ELEMENT_CAST(elem)->last_return)
+
+#define __GST_SIGN(val) ((val) < 0 ? -1 : ((val) > 0 ? 1 : 0))
+/**
+ * GST_STATE_GET_NEXT:
+ * @cur: A starting #GstState
+ * @pending: A target #GstState
+ *
+ * Given a current state @cur and a target state @pending, calculate the next (intermediate)
+ * #GstState.
+ */
+#define GST_STATE_GET_NEXT(cur,pending) ((cur) + __GST_SIGN ((gint)(pending) - (gint)(cur)))
+/**
+ * GST_STATE_TRANSITION:
+ * @cur: A current state
+ * @next: A next state
+ *
+ * Given a current state @cur and a next state @next, calculate the associated
+ * #GstStateChange transition.
+ */
+#define GST_STATE_TRANSITION(cur,next) ((GstStateChange)(((cur)<<3)|(next)))
+/**
+ * GST_STATE_TRANSITION_CURRENT:
+ * @trans: A #GstStateChange
+ *
+ * Given a state transition @trans, extract the current #GstState.
+ */
+#define GST_STATE_TRANSITION_CURRENT(trans) ((GstState)((trans)>>3))
+/**
+ * GST_STATE_TRANSITION_NEXT:
+ * @trans: A #GstStateChange
+ *
+ * Given a state transition @trans, extract the next #GstState.
+ */
+#define GST_STATE_TRANSITION_NEXT(trans) ((GstState)((trans)&0x7))
+
+/**
+ * GstStateChange:
+ * @GST_STATE_CHANGE_NULL_TO_READY : state change from NULL to READY
+ * @GST_STATE_CHANGE_READY_TO_PAUSED : state change from READY to PAUSED
+ * @GST_STATE_CHANGE_PAUSED_TO_PLAYING: state change from PAUSED to PLAYING
+ * @GST_STATE_CHANGE_PLAYING_TO_PAUSED: state change from PLAYING to PAUSED
+ * @GST_STATE_CHANGE_PAUSED_TO_READY : state change from PAUSED to READY
+ * @GST_STATE_CHANGE_READY_TO_NULL : state change from READY to NULL
+ *
+ * The different (interesting) state changes that are passed to the
+ * state change functions of elements.
+ */
+typedef enum /*< flags=0 >*/
+{
+ GST_STATE_CHANGE_NULL_TO_READY = (GST_STATE_NULL<<3) | GST_STATE_READY,
+ GST_STATE_CHANGE_READY_TO_PAUSED = (GST_STATE_READY<<3) | GST_STATE_PAUSED,
+ GST_STATE_CHANGE_PAUSED_TO_PLAYING = (GST_STATE_PAUSED<<3) | GST_STATE_PLAYING,
+ GST_STATE_CHANGE_PLAYING_TO_PAUSED = (GST_STATE_PLAYING<<3) | GST_STATE_PAUSED,
+ GST_STATE_CHANGE_PAUSED_TO_READY = (GST_STATE_PAUSED<<3) | GST_STATE_READY,
+ GST_STATE_CHANGE_READY_TO_NULL = (GST_STATE_READY<<3) | GST_STATE_NULL
+} GstStateChange;
+
+/**
+ * GstElementFlags:
+ * @GST_ELEMENT_LOCKED_STATE: ignore state changes from parent
+ * @GST_ELEMENT_IS_SINK: the element is a sink
+ * @GST_ELEMENT_UNPARENTING: Child is being removed from the parent bin.
+ * gst_bin_remove() on a child already being removed immediately returns FALSE
+ * @GST_ELEMENT_FLAG_LAST: offset to define more flags
+ *
+ * The standard flags that an element may have.
+ */
+typedef enum
+{
+ GST_ELEMENT_LOCKED_STATE = (GST_OBJECT_FLAG_LAST << 0),
+ GST_ELEMENT_IS_SINK = (GST_OBJECT_FLAG_LAST << 1),
+ GST_ELEMENT_UNPARENTING = (GST_OBJECT_FLAG_LAST << 2),
+ /* padding */
+ GST_ELEMENT_FLAG_LAST = (GST_OBJECT_FLAG_LAST << 16)
+} GstElementFlags;
+
+/**
+ * GST_ELEMENT_IS_LOCKED_STATE:
+ * @elem: A #GstElement to query
+ *
+ * Check if the element is in the locked state and therefore will ignore state
+ * changes from its parent object.
+ */
+#define GST_ELEMENT_IS_LOCKED_STATE(elem) (GST_OBJECT_FLAG_IS_SET(elem,GST_ELEMENT_LOCKED_STATE))
+
+/**
+ * GST_ELEMENT_NAME:
+ * @elem: A #GstElement to query
+ *
+ * Gets the name of this element. Use only in core as this is not
+ * ABI-compatible. Others use gst_element_get_name()
+ */
+#define GST_ELEMENT_NAME(elem) (GST_OBJECT_NAME(elem))
+
+/**
+ * GST_ELEMENT_PARENT:
+ * @elem: A #GstElement to query
+ *
+ * Get the parent object of this element.
+ */
+#define GST_ELEMENT_PARENT(elem) (GST_ELEMENT_CAST(GST_OBJECT_PARENT(elem)))
+
+/**
+ * GST_ELEMENT_BUS:
+ * @elem: A #GstElement to query
+ *
+ * Get the message bus of this element.
+ */
+#define GST_ELEMENT_BUS(elem) (GST_ELEMENT_CAST(elem)->bus)
+
+/**
+ * GST_ELEMENT_CLOCK:
+ * @elem: A #GstElement to query
+ *
+ * Get the clock of this element
+ */
+#define GST_ELEMENT_CLOCK(elem) (GST_ELEMENT_CAST(elem)->clock)
+
+/**
+ * GST_ELEMENT_PADS:
+ * @elem: A #GstElement to query
+ *
+ * Get the pads of this elements.
+ */
+#define GST_ELEMENT_PADS(elem) (GST_ELEMENT_CAST(elem)->pads)
+
+/**
+ * GST_ELEMENT_ERROR:
+ * @el: the element that generates the error
+ * @domain: like CORE, LIBRARY, RESOURCE or STREAM (see #GstGError)
+ * @code: error code defined for that domain (see #GstGError)
+ * @text: the message to display (format string and args enclosed in
+ parentheses)
+ * @debug: debugging information for the message (format string and args
+ enclosed in parentheses)
+ *
+ * Utility function that elements can use in case they encountered a fatal
+ * data processing error. The pipeline will post an error message and the
+ * application will be requested to stop further media processing.
+ */
+#define GST_ELEMENT_ERROR(el, domain, code, text, debug) \
+G_STMT_START { \
+ gchar *__txt = _gst_element_error_printf text; \
+ gchar *__dbg = _gst_element_error_printf debug; \
+ if (__txt) \
+ GST_WARNING_OBJECT (el, "error: %s", __txt); \
+ if (__dbg) \
+ GST_WARNING_OBJECT (el, "error: %s", __dbg); \
+ gst_element_message_full (GST_ELEMENT(el), GST_MESSAGE_ERROR, \
+ GST_ ## domain ## _ERROR, GST_ ## domain ## _ERROR_ ## code, \
+ __txt, __dbg, __FILE__, GST_FUNCTION, __LINE__); \
+} G_STMT_END
+
+/**
+ * GST_ELEMENT_WARNING:
+ * @el: the element that generates the warning
+ * @domain: like CORE, LIBRARY, RESOURCE or STREAM (see #gstreamer-GstGError)
+ * @code: error code defined for that domain (see #gstreamer-GstGError)
+ * @text: the message to display (format string and args enclosed in
+ parentheses)
+ * @debug: debugging information for the message (format string and args
+ enclosed in parentheses)
+ *
+ * Utility function that elements can use in case they encountered a non-fatal
+ * data processing problem. The pipeline will post a warning message and the
+ * application will be informed.
+ */
+#define GST_ELEMENT_WARNING(el, domain, code, text, debug) \
+G_STMT_START { \
+ gchar *__txt = _gst_element_error_printf text; \
+ gchar *__dbg = _gst_element_error_printf debug; \
+ if (__txt) \
+ GST_WARNING_OBJECT (el, "warning: %s", __txt); \
+ if (__dbg) \
+ GST_WARNING_OBJECT (el, "warning: %s", __dbg); \
+ gst_element_message_full (GST_ELEMENT(el), GST_MESSAGE_WARNING, \
+ GST_ ## domain ## _ERROR, GST_ ## domain ## _ERROR_ ## code, \
+ __txt, __dbg, __FILE__, GST_FUNCTION, __LINE__); \
+} G_STMT_END
+
+/**
+ * GST_ELEMENT_INFO:
+ * @el: the element that generates the information
+ * @domain: like CORE, LIBRARY, RESOURCE or STREAM (see #gstreamer-GstGError)
+ * @code: error code defined for that domain (see #gstreamer-GstGError)
+ * @text: the message to display (format string and args enclosed in
+ parentheses)
+ * @debug: debugging information for the message (format string and args
+ enclosed in parentheses)
+ *
+ * Utility function that elements can use in case they want to inform
+ * the application of something noteworthy that is not an error.
+ * The pipeline will post a warning message and the
+ * application will be informed.
+ *
+ * Since: 0.10.12
+ */
+#define GST_ELEMENT_INFO(el, domain, code, text, debug) \
+G_STMT_START { \
+ gchar *__txt = _gst_element_error_printf text; \
+ gchar *__dbg = _gst_element_error_printf debug; \
+ if (__txt) \
+ GST_INFO_OBJECT (el, "info: %s", __txt); \
+ if (__dbg) \
+ GST_INFO_OBJECT (el, "info: %s", __dbg); \
+ gst_element_message_full (GST_ELEMENT(el), GST_MESSAGE_INFO, \
+ GST_ ## domain ## _ERROR, GST_ ## domain ## _ERROR_ ## code, \
+ __txt, __dbg, __FILE__, GST_FUNCTION, __LINE__); \
+} G_STMT_END
+
+/* the state change mutexes and conds */
+/**
+ * GST_STATE_GET_LOCK:
+ * @elem: a #GstElement
+ *
+ * Get a reference to the state lock of @elem.
+ * This lock is used by the core. It is taken while getting or setting
+ * the state, during state changes, and while finalizing.
+ */
+#define GST_STATE_GET_LOCK(elem) (GST_ELEMENT_CAST(elem)->state_lock)
+/**
+ * GST_STATE_GET_COND:
+ * @elem: a #GstElement
+ *
+ * Get the conditional used to signal the completion of a state change.
+ */
+#define GST_STATE_GET_COND(elem) (GST_ELEMENT_CAST(elem)->state_cond)
+
+#define GST_STATE_LOCK(elem) g_static_rec_mutex_lock(GST_STATE_GET_LOCK(elem))
+#define GST_STATE_TRYLOCK(elem) g_static_rec_mutex_trylock(GST_STATE_GET_LOCK(elem))
+#define GST_STATE_UNLOCK(elem) g_static_rec_mutex_unlock(GST_STATE_GET_LOCK(elem))
+#define GST_STATE_UNLOCK_FULL(elem) g_static_rec_mutex_unlock_full(GST_STATE_GET_LOCK(elem))
+#define GST_STATE_LOCK_FULL(elem,t) g_static_rec_mutex_lock_full(GST_STATE_GET_LOCK(elem), t)
+#define GST_STATE_WAIT(elem) g_cond_wait (GST_STATE_GET_COND (elem), \
+ GST_OBJECT_GET_LOCK (elem))
+#define GST_STATE_TIMED_WAIT(elem, timeval) g_cond_timed_wait (GST_STATE_GET_COND (elem), \
+ GST_OBJECT_GET_LOCK (elem), timeval)
+#define GST_STATE_SIGNAL(elem) g_cond_signal (GST_STATE_GET_COND (elem));
+#define GST_STATE_BROADCAST(elem) g_cond_broadcast (GST_STATE_GET_COND (elem));
+
+/**
+ * GstElement:
+ * @state_lock: Used to serialize execution of gst_element_set_state()
+ * @state_cond: Used to signal completion of a state change
+ * @state_cookie: Used to detect concurrent execution of
+ * gst_element_set_state() and gst_element_get_state()
+ * @current_state: the current state of an element
+ * @next_state: the next state of an element, can be #GST_STATE_VOID_PENDING if
+ * the element is in the correct state.
+ * @pending_state: the final state the element should go to, can be
+ * #GST_STATE_VOID_PENDING if the element is in the correct state
+ * @last_return: the last return value of an element state change
+ * @bus: the bus of the element. This bus is provided to the element by the
+ * parent element or the application. A #GstPipeline has a bus of its own.
+ * @clock: the clock of the element. This clock is usually provided by to the
+ * element by the toplevel #GstPipeline.
+ * @base_time: the time of the clock right before the element is set to
+ * PLAYING. Subtracting @base_time from the current clock time in the PLAYING
+ * state will yield the stream time.
+ * @numpads: number of pads of the element, includes both source and sink pads.
+ * @pads: list of pads
+ * @numsrcpads: number of source pads of the element.
+ * @srcpads: list of source pads
+ * @numsinkpads: number of sink pads of the element.
+ * @sinkpads: list of sink pads
+ * @pads_cookie: updated whenever the a pad is added or removed
+ *
+ * GStreamer element abstract base class.
+ */
+struct _GstElement
+{
+ GstObject object;
+
+ /*< public >*/ /* with LOCK */
+ GStaticRecMutex *state_lock;
+
+ /* element state */
+ GCond *state_cond;
+ guint32 state_cookie;
+ GstState current_state;
+ GstState next_state;
+ GstState pending_state;
+ GstStateChangeReturn last_return;
+
+ GstBus *bus;
+
+ /* allocated clock */
+ GstClock *clock;
+ GstClockTimeDiff base_time; /* NULL/READY: 0 - PAUSED: current time - PLAYING: difference to clock */
+
+ /* element pads, these lists can only be iterated while holding
+ * the LOCK or checking the cookie after each LOCK. */
+ guint16 numpads;
+ GList *pads;
+ guint16 numsrcpads;
+ GList *srcpads;
+ guint16 numsinkpads;
+ GList *sinkpads;
+ guint32 pads_cookie;
+
+ /*< private >*/
+ union {
+ struct {
+ /* state set by application */
+ GstState target_state;
+ } ABI;
+ /* adding + 0 to mark ABI change to be undone later */
+ gpointer _gst_reserved[GST_PADDING + 0];
+ } abidata;
+};
+
+/**
+ * GstElementClass:
+ * @parent_class: the parent class structure
+ * @details: #GstElementDetails for elements of this class
+ * @elementfactory: the #GstElementFactory that creates these elements
+ * @padtemplates: a #GList of #GstPadTemplate
+ * @numpadtemplates: the number of padtemplates
+ * @pad_templ_cookie: changed whenever the padtemplates change
+ * @request_new_pad: called when a new pad is requested
+ * @release_pad: called when a request pad is to be released
+ * @get_state: get the state of the element
+ * @set_state: set a new state on the element
+ * @change_state: called by @set_state to perform an incremental state change
+ * @set_bus: set a #GstBus on the element
+ * @provide_clock: gets the #GstClock provided by the element
+ * @set_clock: set the #GstClock on the element
+ * @get_index: set a #GstIndex on the element
+ * @set_index: get the #GstIndex of an element
+ * @send_event: send a #GstEvent to the element
+ * @get_query_types: get the supported #GstQueryType of this element
+ * @query: perform a #GstQuery on the element
+ *
+ * GStreamer element class. Override the vmethods to implement the element
+ * functionality.
+ */
+struct _GstElementClass
+{
+ GstObjectClass parent_class;
+
+ /*< public >*/
+ /* the element details */
+ GstElementDetails details;
+
+ /* factory that the element was created from */
+ GstElementFactory *elementfactory;
+
+ /* templates for our pads */
+ GList *padtemplates;
+ gint numpadtemplates;
+ guint32 pad_templ_cookie;
+
+ /*< private >*/
+ /* signal callbacks */
+ void (*pad_added) (GstElement *element, GstPad *pad);
+ void (*pad_removed) (GstElement *element, GstPad *pad);
+ void (*no_more_pads) (GstElement *element);
+
+ /*< public >*/
+ /* virtual methods for subclasses */
+
+ /* request/release pads */
+ GstPad* (*request_new_pad) (GstElement *element, GstPadTemplate *templ, const gchar* name);
+ void (*release_pad) (GstElement *element, GstPad *pad);
+
+ /* state changes */
+ GstStateChangeReturn (*get_state) (GstElement * element, GstState * state,
+ GstState * pending, GstClockTime timeout);
+ GstStateChangeReturn (*set_state) (GstElement *element, GstState state);
+ GstStateChangeReturn (*change_state) (GstElement *element, GstStateChange transition);
+
+ /* bus */
+ void (*set_bus) (GstElement * element, GstBus * bus);
+
+ /* set/get clocks */
+ GstClock* (*provide_clock) (GstElement *element);
+ gboolean (*set_clock) (GstElement *element, GstClock *clock);
+
+ /* index */
+ GstIndex* (*get_index) (GstElement *element);
+ void (*set_index) (GstElement *element, GstIndex *index);
+
+ /* query functions */
+ gboolean (*send_event) (GstElement *element, GstEvent *event);
+
+ const GstQueryType* (*get_query_types) (GstElement *element);
+ gboolean (*query) (GstElement *element, GstQuery *query);
+
+ /*< private >*/
+ gpointer _gst_reserved[GST_PADDING];
+};
+
+/* element class pad templates */
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+void gst_element_class_add_pad_template (GstElementClass *klass, GstPadTemplate *templ);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+GstPadTemplate* gst_element_class_get_pad_template (GstElementClass *element_class, const gchar *name);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+GList* gst_element_class_get_pad_template_list (GstElementClass *element_class);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+void gst_element_class_set_details (GstElementClass *klass, const GstElementDetails *details);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+void gst_element_class_set_details_simple (GstElementClass *klass,
+ const gchar *longname,
+ const gchar *classification,
+ const gchar *description,
+ const gchar *author);
+
+/* element instance */
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+GType gst_element_get_type (void);
+
+/* basic name and parentage stuff from GstObject */
+
+/**
+ * gst_element_get_name:
+ * @elem: a #GstElement to set the name of.
+ *
+ * Gets the name of the element.
+ */
+#define gst_element_get_name(elem) gst_object_get_name(GST_OBJECT_CAST(elem))
+
+/**
+ * gst_element_set_name:
+ * @elem: a #GstElement to set the name of.
+ * @name: the new name
+ *
+ * Sets the name of the element, getting rid of the old name if there was one.
+ */
+#define gst_element_set_name(elem,name) gst_object_set_name(GST_OBJECT_CAST(elem),name)
+
+/**
+ * gst_element_get_parent:
+ * @elem: a #GstElement to get the parent of.
+ *
+ * Gets the parent of an element.
+ */
+#define gst_element_get_parent(elem) gst_object_get_parent(GST_OBJECT_CAST(elem))
+
+/**
+ * gst_element_set_parent:
+ * @elem: a #GstElement to set the parent of.
+ * @parent: the new parent #GstObject of the element.
+ *
+ * Sets the parent of an element.
+ */
+#define gst_element_set_parent(elem,parent) gst_object_set_parent(GST_OBJECT_CAST(elem),parent)
+
+/* clocking */
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+gboolean gst_element_requires_clock (GstElement *element);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+gboolean gst_element_provides_clock (GstElement *element);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+GstClock* gst_element_provide_clock (GstElement *element);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+GstClock* gst_element_get_clock (GstElement *element);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+gboolean gst_element_set_clock (GstElement *element, GstClock *clock);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+void gst_element_set_base_time (GstElement *element, GstClockTime time);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+GstClockTime gst_element_get_base_time (GstElement *element);
+
+/* indexes */
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+gboolean gst_element_is_indexable (GstElement *element);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+void gst_element_set_index (GstElement *element, GstIndex *index);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+GstIndex* gst_element_get_index (GstElement *element);
+
+/* bus */
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+void gst_element_set_bus (GstElement * element, GstBus * bus);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+GstBus * gst_element_get_bus (GstElement * element);
+
+/* pad management */
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+gboolean gst_element_add_pad (GstElement *element, GstPad *pad);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+gboolean gst_element_remove_pad (GstElement *element, GstPad *pad);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+void gst_element_no_more_pads (GstElement *element);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+
+GstPad* gst_element_get_pad (GstElement *element, const gchar *name);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+GstPad* gst_element_get_static_pad (GstElement *element, const gchar *name);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+GstPad* gst_element_get_request_pad (GstElement *element, const gchar *name);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+void gst_element_release_request_pad (GstElement *element, GstPad *pad);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+
+GstIterator * gst_element_iterate_pads (GstElement * element);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+GstIterator * gst_element_iterate_src_pads (GstElement * element);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+GstIterator * gst_element_iterate_sink_pads (GstElement * element);
+
+/* event/query/format stuff */
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+gboolean gst_element_send_event (GstElement *element, GstEvent *event);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+gboolean gst_element_seek (GstElement *element, gdouble rate,
+ GstFormat format, GstSeekFlags flags,
+ GstSeekType cur_type, gint64 cur,
+ GstSeekType stop_type, gint64 stop);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+G_CONST_RETURN GstQueryType*
+ gst_element_get_query_types (GstElement *element);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+gboolean gst_element_query (GstElement *element, GstQuery *query);
+
+/* messages */
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+gboolean gst_element_post_message (GstElement * element, GstMessage * message);
+
+/* error handling */
+/* gcc versions < 3.3 warn about NULL being passed as format to printf */
+#if (defined(GST_USING_PRINTF_EXTENSION) || !defined(__GNUC__) || (__GNUC__ < 3) || (__GNUC__ == 3 && __GNUC_MINOR__ < 3))
+gchar * _gst_element_error_printf (const gchar *format, ...);
+#else
+gchar * _gst_element_error_printf (const gchar *format, ...) G_GNUC_PRINTF (1, 2);
+#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);
+
+/* state management */
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+gboolean gst_element_is_locked_state (GstElement *element);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+gboolean gst_element_set_locked_state (GstElement *element, gboolean locked_state);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+gboolean gst_element_sync_state_with_parent (GstElement *element);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+
+GstStateChangeReturn gst_element_get_state (GstElement * element,
+ GstState * state,
+ GstState * pending,
+ GstClockTime timeout);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+GstStateChangeReturn gst_element_set_state (GstElement *element, GstState state);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+
+void gst_element_abort_state (GstElement * element);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+GstStateChangeReturn gst_element_change_state (GstElement * element,
+ GstStateChange transition);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+GstStateChangeReturn gst_element_continue_state (GstElement * element,
+ GstStateChangeReturn ret);
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+void gst_element_lost_state (GstElement * element);
+
+/* factory management */
+#ifdef __SYMBIAN32__
+IMPORT_C
+#endif
+
+GstElementFactory* gst_element_get_factory (GstElement *element);
+
+G_END_DECLS
+
+#endif /* __GST_ELEMENT_H__ */