mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-04 16:39:39 +00:00
74ca793b0a
Original commit message from CVS: Clock fixes. Added async callbacks and clock unscheduling. Threading fixes. Fixed race condition in GstTask and possible deadlock in _pad_get_caps(). Made various subsystems (query, format,..) threadsafe. Lots of cleanups and documentation.
2358 lines
63 KiB
C
2358 lines
63 KiB
C
/* 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.
|
|
*/
|
|
|
|
#include "gst_private.h"
|
|
#include <glib.h>
|
|
#include <stdarg.h>
|
|
#include <gobject/gvaluecollector.h>
|
|
|
|
#include "gstelement.h"
|
|
|
|
#include "gstmarshal.h"
|
|
#include "gsterror.h"
|
|
#include "gstevent.h"
|
|
#include "gstutils.h"
|
|
#include "gstinfo.h"
|
|
#include "gst-i18n-lib.h"
|
|
|
|
#include "gstscheduler.h"
|
|
#include "gstbus.h"
|
|
|
|
/* Element signals and args */
|
|
enum
|
|
{
|
|
STATE_CHANGE,
|
|
NEW_PAD,
|
|
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 GstElementStateReturn gst_element_change_state (GstElement * element);
|
|
static gboolean gst_element_get_state_func (GstElement * element,
|
|
GstElementState * state, GstElementState * pending, GTimeVal * timeout);
|
|
static void gst_element_set_manager_func (GstElement * element,
|
|
GstPipeline * manager);
|
|
static void gst_element_set_bus_func (GstElement * element, GstBus * bus);
|
|
static void gst_element_set_scheduler_func (GstElement * element,
|
|
GstScheduler * scheduler);
|
|
|
|
#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
|
|
|
|
GType _gst_element_type = 0;
|
|
|
|
static GstObjectClass *parent_class = NULL;
|
|
static guint gst_element_signals[LAST_SIGNAL] = { 0 };
|
|
|
|
GType
|
|
gst_element_get_type (void)
|
|
{
|
|
if (!_gst_element_type) {
|
|
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_ref (GST_TYPE_OBJECT);
|
|
|
|
gst_element_signals[STATE_CHANGE] =
|
|
g_signal_new ("state-change", G_TYPE_FROM_CLASS (klass),
|
|
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstElementClass, state_change), NULL,
|
|
NULL, gst_marshal_VOID__INT_INT, G_TYPE_NONE, 2, G_TYPE_INT, G_TYPE_INT);
|
|
gst_element_signals[NEW_PAD] =
|
|
g_signal_new ("new-pad", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
|
|
G_STRUCT_OFFSET (GstElementClass, new_pad), NULL, NULL,
|
|
gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, G_TYPE_OBJECT);
|
|
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, G_TYPE_OBJECT);
|
|
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);
|
|
|
|
#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);
|
|
klass->get_state = GST_DEBUG_FUNCPTR (gst_element_get_state_func);
|
|
klass->set_manager = GST_DEBUG_FUNCPTR (gst_element_set_manager_func);
|
|
klass->set_bus = GST_DEBUG_FUNCPTR (gst_element_set_bus_func);
|
|
klass->set_scheduler = GST_DEBUG_FUNCPTR (gst_element_set_scheduler_func);
|
|
klass->numpadtemplates = 0;
|
|
|
|
klass->elementfactory = NULL;
|
|
}
|
|
|
|
static void
|
|
gst_element_base_class_init (gpointer g_class)
|
|
{
|
|
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
|
|
|
|
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)
|
|
{
|
|
element->current_state = GST_STATE_NULL;
|
|
element->pending_state = GST_STATE_VOID_PENDING;
|
|
element->numpads = 0;
|
|
element->numsrcpads = 0;
|
|
element->numsinkpads = 0;
|
|
element->pads_cookie = 0;
|
|
element->pads = NULL;
|
|
element->srcpads = NULL;
|
|
element->sinkpads = NULL;
|
|
element->manager = NULL;
|
|
element->clock = NULL;
|
|
element->sched_private = NULL;
|
|
element->state_lock = g_mutex_new ();
|
|
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.
|
|
*/
|
|
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.
|
|
*/
|
|
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 (oclass->release_pad)
|
|
(oclass->release_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.
|
|
*/
|
|
gboolean
|
|
gst_element_requires_clock (GstElement * element)
|
|
{
|
|
gboolean result = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), result);
|
|
|
|
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.
|
|
*
|
|
* Returns: TRUE if the element provides a clock
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_provides_clock (GstElement * element)
|
|
{
|
|
gboolean result = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
|
|
result = (GST_ELEMENT_GET_CLASS (element)->get_clock != NULL);
|
|
|
|
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.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
void
|
|
gst_element_set_clock (GstElement * element, GstClock * clock)
|
|
{
|
|
GstElementClass *oclass;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->set_clock)
|
|
oclass->set_clock (element, clock);
|
|
|
|
GST_LOCK (element);
|
|
gst_object_replace ((GstObject **) & element->clock, (GstObject *) clock);
|
|
GST_UNLOCK (element);
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_clock:
|
|
* @element: a #GstElement to get the clock of.
|
|
*
|
|
* Gets the clock of the element. If the element provides a clock,
|
|
* this function will return this clock. For elements that do not
|
|
* provide a clock, this function returns NULL.
|
|
*
|
|
* Returns: the #GstClock of the element. unref after usage.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstClock *
|
|
gst_element_get_clock (GstElement * element)
|
|
{
|
|
GstElementClass *oclass;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->get_clock)
|
|
return oclass->get_clock (element);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
#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.
|
|
*/
|
|
gboolean
|
|
gst_element_is_indexable (GstElement * element)
|
|
{
|
|
gboolean result = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), result);
|
|
|
|
result = (GST_ELEMENT_GET_CLASS (element)->set_index != NULL);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_index:
|
|
* @element: a #GstElement.
|
|
* @index: a #GstIndex.
|
|
*
|
|
* Set the specified GstIndex on the element.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
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.
|
|
*/
|
|
GstIndex *
|
|
gst_element_get_index (GstElement * element)
|
|
{
|
|
GstElementClass *oclass;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->get_index)
|
|
return oclass->get_index (element);
|
|
|
|
return NULL;
|
|
}
|
|
#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;
|
|
* see gst_object_set_parent() for refcounting information.
|
|
*
|
|
* Pads are automatically activated when the element is in state PLAYING.
|
|
*
|
|
* The pad and the element should be unlocked when calling this function.
|
|
*
|
|
* Returns: TRUE if the pad could be added. This function can fail when
|
|
* passing bad arguments or when a pad with the same name already existed.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_add_pad (GstElement * element, GstPad * pad)
|
|
{
|
|
gchar *pad_name;
|
|
|
|
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_LOCK (pad);
|
|
pad_name = g_strdup (GST_PAD_NAME (pad));
|
|
GST_UNLOCK (pad);
|
|
|
|
/* then check to see if there's already a pad by that name here */
|
|
GST_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;
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_ELEMENT_PADS, element, "adding pad '%s'",
|
|
GST_STR_NULL (GST_PAD_NAME (pad)));
|
|
|
|
/* 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:
|
|
/* can happen for ghost pads */
|
|
break;
|
|
}
|
|
element->pads = g_list_prepend (element->pads, pad);
|
|
element->numpads++;
|
|
element->pads_cookie++;
|
|
GST_UNLOCK (element);
|
|
|
|
GST_STATE_LOCK (element);
|
|
/* activate pad when we are playing */
|
|
if (GST_STATE (element) == GST_STATE_PLAYING)
|
|
/* FIXME, figure out mode */
|
|
gst_pad_set_active (pad, GST_ACTIVATE_PUSH);
|
|
GST_STATE_UNLOCK (element);
|
|
|
|
/* emit the NEW_PAD signal */
|
|
g_signal_emit (G_OBJECT (element), gst_element_signals[NEW_PAD], 0, pad);
|
|
|
|
return TRUE;
|
|
|
|
name_exists:
|
|
{
|
|
g_critical ("Padname %s is not unique in element %s, not adding",
|
|
pad_name, GST_ELEMENT_NAME (element));
|
|
GST_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_UNLOCK (element);
|
|
g_free (pad_name);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_add_ghost_pad:
|
|
* @element: a #GstElement to add the ghost pad to.
|
|
* @pad: the #GstPad from which the new ghost pad will be created.
|
|
* @name: the name of the new ghost pad, or NULL to assign a unique name
|
|
* automatically.
|
|
*
|
|
* Creates a ghost pad from @pad, and adds it to @element via
|
|
* gst_element_add_pad().
|
|
*
|
|
* Returns: the added ghost #GstPad, or NULL on error.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstPad *
|
|
gst_element_add_ghost_pad (GstElement * element, GstPad * pad,
|
|
const gchar * name)
|
|
{
|
|
GstPad *ghostpad;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
|
|
ghostpad = gst_ghost_pad_new (name, pad);
|
|
|
|
if (!gst_element_add_pad (element, ghostpad)) {
|
|
gst_object_unref (GST_OBJECT (ghostpad));
|
|
ghostpad = NULL;
|
|
}
|
|
|
|
return ghostpad;
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* Returns: TRUE if the pad could be removed. Can return FALSE if the
|
|
* pad is not belonging to the provided element or when wrong parameters
|
|
* are passed to this function.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_remove_pad (GstElement * element, GstPad * pad)
|
|
{
|
|
GstElement *current_parent;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
|
|
current_parent = gst_pad_get_parent (pad);
|
|
if (G_UNLIKELY (current_parent != element))
|
|
goto not_our_pad;
|
|
|
|
gst_object_unref (GST_OBJECT_CAST (current_parent));
|
|
|
|
/* FIXME, is this redundant with pad disposal? */
|
|
if (GST_IS_REAL_PAD (pad)) {
|
|
GstPad *peer = gst_pad_get_peer (pad);
|
|
|
|
/* unlink */
|
|
if (peer != NULL) {
|
|
/* 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, GST_PAD_CAST (peer));
|
|
else
|
|
gst_pad_unlink (GST_PAD_CAST (peer), pad);
|
|
|
|
gst_object_unref (GST_OBJECT (peer));
|
|
}
|
|
} else if (GST_IS_GHOST_PAD (pad)) {
|
|
g_object_set (pad, "real-pad", NULL, NULL);
|
|
}
|
|
|
|
GST_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:
|
|
/* can happen for ghost pads */
|
|
break;
|
|
}
|
|
element->pads = g_list_remove (element->pads, pad);
|
|
element->numpads--;
|
|
element->pads_cookie++;
|
|
GST_UNLOCK (element);
|
|
|
|
g_signal_emit (G_OBJECT (element), gst_element_signals[PAD_REMOVED], 0, pad);
|
|
|
|
gst_object_unparent (GST_OBJECT (pad));
|
|
|
|
return TRUE;
|
|
|
|
not_our_pad:
|
|
{
|
|
gchar *parent_name = gst_element_get_name (current_parent);
|
|
|
|
gst_object_unref (GST_OBJECT (current_parent));
|
|
GST_LOCK (pad);
|
|
GST_LOCK (element);
|
|
g_critical ("Padname %s:%s does not belong to element %s when removing",
|
|
parent_name, GST_PAD_NAME (pad), GST_ELEMENT_NAME (element));
|
|
GST_UNLOCK (element);
|
|
GST_UNLOCK (pad);
|
|
g_free (parent_name);
|
|
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.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
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_LOCK (pad1);
|
|
result = strcmp (GST_PAD_NAME (pad1), name);
|
|
GST_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.
|
|
*/
|
|
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_LOCK (element);
|
|
find =
|
|
g_list_find_custom (element->pads, name, (GCompareFunc) pad_compare_name);
|
|
if (find) {
|
|
result = GST_PAD (find->data);
|
|
gst_object_ref (GST_OBJECT (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_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);
|
|
|
|
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.
|
|
*
|
|
* Returns: requested #GstPad if found, otherwise NULL.
|
|
*/
|
|
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 (strstr (name, "%")) {
|
|
templ = gst_element_class_get_pad_template (class, name);
|
|
req_name = NULL;
|
|
if (templ)
|
|
templ_found = TRUE;
|
|
} else {
|
|
list = gst_element_class_get_pad_template_list (class);
|
|
while (!templ_found && list) {
|
|
templ = (GstPadTemplate *) list->data;
|
|
if (templ->presence == GST_PAD_REQUEST) {
|
|
/* 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. */
|
|
GST_CAT_DEBUG (GST_CAT_PADS, "comparing %s to %s", name,
|
|
templ->name_template);
|
|
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().
|
|
*
|
|
* Returns: the #GstPad if found, otherwise %NULL. Unref after usage.
|
|
*/
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* gst_element_iterate_pads:
|
|
* @element: a #GstElement to iterate pads of.
|
|
*
|
|
* Retrieves an iterattor of @element's pads.
|
|
*
|
|
* Returns: the #GstIterator of pads.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstIterator *
|
|
gst_element_iterate_pads (GstElement * element)
|
|
{
|
|
GstIterator *result;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
|
|
GST_LOCK (element);
|
|
gst_object_ref (GST_OBJECT (element));
|
|
result = gst_iterator_new_list (GST_GET_LOCK (element),
|
|
&element->pads_cookie,
|
|
&element->pads,
|
|
element,
|
|
(GstIteratorRefFunction) gst_object_ref,
|
|
(GstIteratorUnrefFunction) gst_object_unref,
|
|
(GstIteratorDisposeFunction) gst_object_unref);
|
|
GST_UNLOCK (element);
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
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));
|
|
|
|
/* 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 (GST_OBJECT (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>
|
|
*/
|
|
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_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.
|
|
*/
|
|
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.
|
|
*/
|
|
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 GstPad *
|
|
gst_element_get_random_pad (GstElement * element, GstPadDirection dir)
|
|
{
|
|
GstPad *result = NULL;
|
|
GList *pads;
|
|
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "getting a random pad");
|
|
|
|
GST_LOCK (element);
|
|
switch (dir) {
|
|
case GST_PAD_SRC:
|
|
pads = element->srcpads;
|
|
case GST_PAD_SINK:
|
|
pads = element->sinkpads;
|
|
default:
|
|
g_warning ("unknown pad direction");
|
|
return NULL;
|
|
}
|
|
for (; pads; pads = g_list_next (pads)) {
|
|
GstPad *pad = GST_PAD (pads->data);
|
|
|
|
GST_LOCK (pad);
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "checking pad %s:%s",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
|
|
if (GST_PAD_IS_LINKED (pad)) {
|
|
GST_UNLOCK (pad);
|
|
result = pad;
|
|
break;
|
|
} else {
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "pad %s:%s is not linked",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
}
|
|
GST_UNLOCK (pad);
|
|
}
|
|
if (result)
|
|
gst_object_ref (GST_OBJECT (result));
|
|
|
|
GST_UNLOCK (element);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_event_masks:
|
|
* @element: a #GstElement to query
|
|
*
|
|
* Get an array of event masks from the element.
|
|
* If the element doesn't implement an event masks function,
|
|
* the query will be forwarded to a random linked sink pad.
|
|
*
|
|
* Returns: An array of #GstEventMask elements. The array
|
|
* cannot be modified or freed.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
const GstEventMask *
|
|
gst_element_get_event_masks (GstElement * element)
|
|
{
|
|
GstElementClass *oclass;
|
|
const GstEventMask *result = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->get_event_masks) {
|
|
result = oclass->get_event_masks (element);
|
|
} else {
|
|
GstPad *pad = gst_element_get_random_pad (element, GST_PAD_SINK);
|
|
|
|
if (pad) {
|
|
GstPad *peer = gst_pad_get_peer (pad);
|
|
|
|
if (peer) {
|
|
result = gst_pad_get_event_masks (peer);
|
|
gst_object_unref (GST_OBJECT (peer));
|
|
}
|
|
gst_object_unref (GST_OBJECT (pad));
|
|
}
|
|
}
|
|
|
|
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 forwarded
|
|
* to a random sink pad. This function takes owership of the
|
|
* provided event so you should _ref it if you want to reuse
|
|
* the event after this call.
|
|
*
|
|
* Returns: TRUE if the event was handled.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
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);
|
|
|
|
if (oclass->send_event) {
|
|
result = oclass->send_event (element, event);
|
|
} else {
|
|
GstPad *pad = gst_element_get_random_pad (element, GST_PAD_SINK);
|
|
|
|
if (pad) {
|
|
GstPad *peer = gst_pad_get_peer (pad);
|
|
|
|
if (peer) {
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
|
|
"sending event to random pad %s:%s", GST_DEBUG_PAD_NAME (pad));
|
|
|
|
result = gst_pad_send_event (peer, event);
|
|
gst_object_unref (GST_OBJECT (peer));
|
|
}
|
|
gst_object_unref (GST_OBJECT (pad));
|
|
}
|
|
}
|
|
GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "can't send event on element %s",
|
|
GST_ELEMENT_NAME (element));
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_seek:
|
|
* @element: a #GstElement to send the event to.
|
|
* @seek_type: the method to use for seeking.
|
|
* @offset: the offset to seek to.
|
|
*
|
|
* Sends a seek event to an element.
|
|
*
|
|
* Returns: TRUE if the event was handled.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_seek (GstElement * element, GstSeekType seek_type, guint64 offset)
|
|
{
|
|
GstEvent *event = gst_event_new_seek (seek_type, offset);
|
|
gboolean result;
|
|
|
|
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 a random sink pad.
|
|
*
|
|
* Returns: An array of #GstQueryType elements that should not
|
|
* be freed or modified.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
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, GST_PAD_SINK);
|
|
|
|
if (pad) {
|
|
GstPad *peer = gst_pad_get_peer (pad);
|
|
|
|
if (peer) {
|
|
result = gst_pad_get_query_types (peer);
|
|
|
|
gst_object_unref (GST_OBJECT (peer));
|
|
}
|
|
gst_object_unref (GST_OBJECT (pad));
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_query:
|
|
* @element: a #GstElement to perform the query on.
|
|
* @type: the #GstQueryType.
|
|
* @format: the #GstFormat pointer to hold the format of the result.
|
|
* @value: the pointer to the value of the result.
|
|
*
|
|
* Performs a query on the given element. If the format is set
|
|
* to GST_FORMAT_DEFAULT and this function returns TRUE, the
|
|
* format pointer will hold the default format.
|
|
* For element that don't implement a query handler, this function
|
|
* forwards the query to a random usable sinkpad of this element.
|
|
*
|
|
* Returns: TRUE if the query could be performed.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_query (GstElement * element, GstQueryType type,
|
|
GstFormat * format, gint64 * value)
|
|
{
|
|
GstElementClass *oclass;
|
|
gboolean result = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
g_return_val_if_fail (format != NULL, FALSE);
|
|
g_return_val_if_fail (value != NULL, FALSE);
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->query) {
|
|
result = oclass->query (element, type, format, value);
|
|
} else {
|
|
GstPad *pad = gst_element_get_random_pad (element, GST_PAD_SRC);
|
|
|
|
if (pad) {
|
|
result = gst_pad_query (pad, type, format, value);
|
|
|
|
gst_object_unref (GST_OBJECT (pad));
|
|
} else {
|
|
pad = gst_element_get_random_pad (element, GST_PAD_SINK);
|
|
if (pad) {
|
|
GstPad *peer = gst_pad_get_peer (pad);
|
|
|
|
if (peer) {
|
|
result = gst_pad_query (peer, type, format, value);
|
|
|
|
gst_object_unref (GST_OBJECT (peer));
|
|
}
|
|
gst_object_unref (GST_OBJECT (pad));
|
|
}
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_formats:
|
|
* @element: a #GstElement to query
|
|
*
|
|
* Get an array of formats from the element.
|
|
* If the element doesn't implement a formats function,
|
|
* the query will be forwarded to a random sink pad.
|
|
*
|
|
* Returns: An array of #GstFormat elements.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
const GstFormat *
|
|
gst_element_get_formats (GstElement * element)
|
|
{
|
|
GstElementClass *oclass;
|
|
const GstFormat *result = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->get_formats) {
|
|
result = oclass->get_formats (element);
|
|
} else {
|
|
GstPad *pad = gst_element_get_random_pad (element, GST_PAD_SINK);
|
|
|
|
if (pad) {
|
|
GstPad *peer = gst_pad_get_peer (pad);
|
|
|
|
if (peer) {
|
|
result = gst_pad_get_formats (peer);
|
|
|
|
gst_object_unref (GST_OBJECT (peer));
|
|
}
|
|
gst_object_unref (GST_OBJECT (pad));
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_convert:
|
|
* @element: a #GstElement to invoke the converter on.
|
|
* @src_format: the source #GstFormat.
|
|
* @src_value: the source value.
|
|
* @dest_format: a pointer to the destination #GstFormat.
|
|
* @dest_value: a pointer to the destination value.
|
|
*
|
|
* Invokes a conversion on the element.
|
|
* If the element doesn't implement a convert function,
|
|
* the query will be forwarded to a random sink pad.
|
|
*
|
|
* Returns: TRUE if the conversion could be performed.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_convert (GstElement * element,
|
|
GstFormat src_format, gint64 src_value,
|
|
GstFormat * dest_format, gint64 * dest_value)
|
|
{
|
|
GstElementClass *oclass;
|
|
gboolean result = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
g_return_val_if_fail (dest_format != NULL, FALSE);
|
|
g_return_val_if_fail (dest_value != NULL, FALSE);
|
|
|
|
if (src_format == *dest_format) {
|
|
*dest_value = src_value;
|
|
return TRUE;
|
|
}
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->convert) {
|
|
result = oclass->convert (element,
|
|
src_format, src_value, dest_format, dest_value);
|
|
} else {
|
|
GstPad *pad = gst_element_get_random_pad (element, GST_PAD_SINK);
|
|
|
|
if (pad) {
|
|
GstPad *peer = gst_pad_get_peer (pad);
|
|
|
|
if (peer) {
|
|
result = gst_pad_convert (peer,
|
|
src_format, src_value, dest_format, dest_value);
|
|
|
|
gst_object_unref (GST_OBJECT (peer));
|
|
}
|
|
gst_object_unref (GST_OBJECT (pad));
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_post_message:
|
|
* @element: a #GstElement posting the message
|
|
* @message: a #GstMessage to post
|
|
*
|
|
* Post a message on the elements #GstBus.
|
|
*
|
|
* Returns: TRUE if the message was successfuly posted.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_post_message (GstElement * element, GstMessage * message)
|
|
{
|
|
GstBus *bus;
|
|
gboolean result = FALSE;
|
|
|
|
GST_DEBUG ("posting message %p ...", message);
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
g_return_val_if_fail (message != NULL, FALSE);
|
|
|
|
GST_LOCK (element);
|
|
bus = element->bus;
|
|
|
|
if (G_UNLIKELY (bus == NULL)) {
|
|
GST_DEBUG ("... but I won't because I have no bus");
|
|
GST_UNLOCK (element);
|
|
gst_data_unref (GST_DATA (message));
|
|
return FALSE;
|
|
}
|
|
gst_object_ref (GST_OBJECT (bus));
|
|
GST_DEBUG ("... on bus %p", bus);
|
|
GST_UNLOCK (element);
|
|
|
|
result = gst_bus_post (bus, message);
|
|
gst_object_unref (GST_OBJECT (bus));
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* _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.
|
|
*/
|
|
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 or warning message on the bus from inside an element.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
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;
|
|
GstMessage *message = NULL;
|
|
|
|
/* checks */
|
|
GST_DEBUG ("start");
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
g_return_if_fail ((type == GST_MESSAGE_ERROR) ||
|
|
(type == GST_MESSAGE_WARNING));
|
|
|
|
/* 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_text (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 (""); */
|
|
sent_debug = NULL;
|
|
} else {
|
|
name = gst_object_get_path_string (GST_OBJECT (element));
|
|
sent_debug = g_strdup_printf ("%s(%d): %s: %s:\n%s",
|
|
file, line, function, name, debug ? debug : "");
|
|
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);
|
|
|
|
if (type == GST_MESSAGE_ERROR) {
|
|
message = gst_message_new_error (GST_OBJECT (element), gerror, sent_debug);
|
|
} else {
|
|
message = gst_message_new_warning (GST_OBJECT (element), gerror,
|
|
sent_debug);
|
|
}
|
|
gst_element_post_message (element, message);
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_ERROR_SYSTEM, element, "posted message: %s",
|
|
sent_text);
|
|
|
|
/* cleanup */
|
|
g_free (sent_text);
|
|
/* sent_debug is not part of the gerror, so don't free it here */
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* Returns: TRUE, if the element's state is locked.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_is_locked_state (GstElement * element)
|
|
{
|
|
gboolean result = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
|
|
GST_LOCK (element);
|
|
/* be careful with the flag tests */
|
|
result = !!GST_FLAG_IS_SET (element, GST_ELEMENT_LOCKED_STATE);
|
|
GST_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.
|
|
*
|
|
* Returns: TRUE if the state was changed, FALSE if bad params were given or
|
|
* the element was already in the correct state.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_set_locked_state (GstElement * element, gboolean locked_state)
|
|
{
|
|
gboolean old;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
|
|
GST_LOCK (element);
|
|
old = GST_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_FLAG_SET (element, GST_ELEMENT_LOCKED_STATE);
|
|
} else {
|
|
GST_CAT_DEBUG (GST_CAT_STATES, "unlocking state of element %s",
|
|
GST_ELEMENT_NAME (element));
|
|
GST_FLAG_UNSET (element, GST_ELEMENT_LOCKED_STATE);
|
|
}
|
|
GST_UNLOCK (element);
|
|
|
|
return TRUE;
|
|
|
|
was_ok:
|
|
GST_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.
|
|
*/
|
|
gboolean
|
|
gst_element_sync_state_with_parent (GstElement * element)
|
|
{
|
|
GstElement *parent;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
parent = GST_ELEMENT (GST_ELEMENT_PARENT (element));
|
|
g_return_val_if_fail (GST_IS_BIN (parent), FALSE);
|
|
|
|
GST_CAT_DEBUG (GST_CAT_STATES, "syncing state of element %s (%s) to %s (%s)",
|
|
GST_ELEMENT_NAME (element),
|
|
gst_element_state_get_name (GST_STATE (element)),
|
|
GST_ELEMENT_NAME (parent),
|
|
gst_element_state_get_name (GST_STATE (parent)));
|
|
|
|
if (gst_element_set_state (element, GST_STATE (parent)) == GST_STATE_FAILURE) {
|
|
return FALSE;
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
/* MT safe */
|
|
static gboolean
|
|
gst_element_get_state_func (GstElement * element,
|
|
GstElementState * state, GstElementState * pending, GTimeVal * timeout)
|
|
{
|
|
gboolean ret = FALSE;
|
|
GstElementState old_pending;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
|
|
GST_STATE_LOCK (element);
|
|
old_pending = GST_STATE_PENDING (element);
|
|
if (old_pending != GST_STATE_VOID_PENDING) {
|
|
/* we have a pending state change, wait for it to complete */
|
|
if (!GST_STATE_TIMED_WAIT (element, timeout)) {
|
|
/* timeout triggered */
|
|
if (state)
|
|
*state = GST_STATE (element);
|
|
if (pending)
|
|
*pending = GST_STATE_PENDING (element);
|
|
ret = FALSE;
|
|
} else {
|
|
/* could be success or failure, we could check here if the
|
|
* state is equal to the old pending state */
|
|
}
|
|
}
|
|
/* if nothing is pending anymore we can return TRUE and
|
|
* set the values of the current and pending state */
|
|
if (GST_STATE_PENDING (element) == GST_STATE_VOID_PENDING) {
|
|
if (state)
|
|
*state = GST_STATE (element);
|
|
if (pending)
|
|
*pending = GST_STATE_VOID_PENDING;
|
|
ret = TRUE;
|
|
}
|
|
GST_STATE_UNLOCK (element);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_state:
|
|
* @element: a #GstElement to get the state of.
|
|
* @state: a pointer to #GstElementState to hold the state. Can be NULL.
|
|
* @pending: a pointer to #GstElementState to hold the pending state.
|
|
* Can be NULL.
|
|
* @timeout: a #GTimeVal to specify the timeout for an async
|
|
* state change.
|
|
*
|
|
* Gets the state of the element.
|
|
*
|
|
* Returns: TRUE if the element has no more pending state, FALSE
|
|
* if the element is still performing a state change.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_element_get_state (GstElement * element,
|
|
GstElementState * state, GstElementState * pending, GTimeVal * timeout)
|
|
{
|
|
GstElementClass *oclass;
|
|
gboolean result = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
|
|
|
|
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.
|
|
*/
|
|
void
|
|
gst_element_abort_state (GstElement * element)
|
|
{
|
|
GstElementState pending;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
pending = GST_STATE_PENDING (element);
|
|
|
|
if (pending != GST_STATE_VOID_PENDING) {
|
|
GstElementState 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));
|
|
|
|
GST_STATE_PENDING (element) = GST_STATE_VOID_PENDING;
|
|
|
|
GST_STATE_BROADCAST (element);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_commit_state:
|
|
* @element: a #GstElement to commit the state of.
|
|
*
|
|
* Commit the state change of the element. This function is used
|
|
* by elements that do asynchronous state changes.
|
|
*
|
|
* This function can only be called with the STATE_LOCK held.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
void
|
|
gst_element_commit_state (GstElement * element)
|
|
{
|
|
GstElementState pending;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
pending = GST_STATE_PENDING (element);
|
|
|
|
if (pending != GST_STATE_VOID_PENDING) {
|
|
GstElementState old_state = GST_STATE (element);
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
|
|
"commiting state from %s to %s", gst_element_state_get_name (old_state),
|
|
gst_element_state_get_name (pending));
|
|
|
|
GST_STATE (element) = pending;
|
|
GST_STATE_PENDING (element) = GST_STATE_VOID_PENDING;
|
|
|
|
g_signal_emit (G_OBJECT (element), gst_element_signals[STATE_CHANGE],
|
|
0, old_state, pending);
|
|
GST_STATE_BROADCAST (element);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_state:
|
|
* @element: a #GstElement to change state of.
|
|
* @state: the element's new #GstElementState.
|
|
*
|
|
* 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.
|
|
*
|
|
* Returns: Result of the state change using #GstElementStateReturn.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstElementStateReturn
|
|
gst_element_set_state (GstElement * element, GstElementState state)
|
|
{
|
|
GstElementClass *oclass;
|
|
GstElementState current;
|
|
GstElementStateReturn return_val = GST_STATE_SUCCESS;
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
/* get the element state lock */
|
|
GST_STATE_LOCK (element);
|
|
|
|
/* start with the current state */
|
|
current = GST_STATE (element);
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element, "setting state from %s to %s",
|
|
gst_element_state_get_name (current), gst_element_state_get_name (state));
|
|
|
|
/* We always perform at least one state change, even if the
|
|
* current state is equal to the required state. This is needed
|
|
* for bins that sync their children. */
|
|
do {
|
|
GstElementState pending;
|
|
|
|
/* calculate the pending state */
|
|
if (current < state)
|
|
pending = current << 1;
|
|
else if (current > state)
|
|
pending = current >> 1;
|
|
else
|
|
pending = current;
|
|
|
|
/* set the pending state variable */
|
|
GST_STATE_PENDING (element) = pending;
|
|
|
|
if (pending != state) {
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
|
|
"intermediate: setting state from %s to %s",
|
|
gst_element_state_get_name (current),
|
|
gst_element_state_get_name (pending));
|
|
} else {
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
|
|
"final: setting state from %s to %s",
|
|
gst_element_state_get_name (current),
|
|
gst_element_state_get_name (pending));
|
|
}
|
|
|
|
/* call the state change function so it can set the state */
|
|
if (oclass->change_state)
|
|
return_val = (oclass->change_state) (element);
|
|
else
|
|
return_val = GST_STATE_FAILURE;
|
|
|
|
switch (return_val) {
|
|
case GST_STATE_FAILURE:
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
|
|
"have failed change_state return");
|
|
/* state change failure exits the loop */
|
|
gst_element_abort_state (element);
|
|
goto exit;
|
|
case GST_STATE_ASYNC:
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
|
|
"element will change state async");
|
|
/* an async state change exits the loop, we can only
|
|
* go to the next state change when this one completes. */
|
|
goto exit;
|
|
case GST_STATE_SUCCESS:
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
|
|
"element changed state successfuly");
|
|
/* we can commit the state now and proceed to the next state */
|
|
gst_element_commit_state (element);
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element, "commited state");
|
|
break;
|
|
default:
|
|
/* somebody added a GST_STATE_ and forgot to do stuff here ! */
|
|
g_assert_not_reached ();
|
|
}
|
|
/* get the current state of the element and see if we need to do more
|
|
* state changes */
|
|
current = GST_STATE (element);
|
|
}
|
|
while (current != state);
|
|
|
|
exit:
|
|
GST_STATE_UNLOCK (element);
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element, "exit state change");
|
|
|
|
return return_val;
|
|
}
|
|
|
|
/* is called with STATE_LOCK
|
|
*
|
|
* This function activates the pads of a given element.
|
|
*
|
|
* TODO: activates pads from src to sinks?
|
|
*
|
|
* */
|
|
static gboolean
|
|
gst_element_pads_activate (GstElement * element, gboolean active)
|
|
{
|
|
GList *pads;
|
|
gboolean result;
|
|
guint32 cookie;
|
|
|
|
GST_LOCK (element);
|
|
restart:
|
|
result = TRUE;
|
|
pads = element->pads;
|
|
cookie = element->pads_cookie;
|
|
for (; pads && result; pads = g_list_next (pads)) {
|
|
GstPad *pad = GST_PAD (pads->data);
|
|
|
|
gst_object_ref (GST_OBJECT (pad));
|
|
GST_UNLOCK (element);
|
|
|
|
/* we only care about real pads */
|
|
if (GST_IS_REAL_PAD (pad)) {
|
|
GstRealPad *peer;
|
|
gboolean pad_loop;
|
|
gboolean delay = FALSE;
|
|
|
|
/* see if the pad has a loop function and grab
|
|
* the peer */
|
|
GST_LOCK (pad);
|
|
pad_loop = GST_RPAD_LOOPFUNC (pad) != NULL;
|
|
peer = GST_RPAD_PEER (pad);
|
|
if (peer)
|
|
gst_object_ref (GST_OBJECT (peer));
|
|
GST_UNLOCK (pad);
|
|
|
|
if (peer) {
|
|
gboolean peer_loop;
|
|
|
|
/* see if the peer has a loop function */
|
|
peer_loop = GST_RPAD_LOOPFUNC (peer) != NULL;
|
|
|
|
/* sinkpads with a loop function are delayed since they
|
|
* need the srcpad to be active first */
|
|
if (GST_PAD_IS_SINK (pad) && pad_loop) {
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
|
|
"delaying pad %s", GST_OBJECT_NAME (pad));
|
|
delay = TRUE;
|
|
} else if (GST_PAD_IS_SRC (pad) && peer_loop) {
|
|
/* If the pad is a source and the peer has a loop function,
|
|
* we can activate the srcpad and then the loopbased sinkpad */
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
|
|
"%sactivating pad %s", (active ? "" : "(de)"),
|
|
GST_OBJECT_NAME (pad));
|
|
result &= gst_pad_set_active (pad,
|
|
(active ? GST_ACTIVATE_PULL : GST_ACTIVATE_NONE));
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
|
|
"%sactivating delayed pad %s", (active ? "" : "(de)"),
|
|
GST_OBJECT_NAME (peer));
|
|
result &= gst_pad_set_active (GST_PAD (peer),
|
|
(active ? GST_ACTIVATE_PULL : GST_ACTIVATE_NONE));
|
|
|
|
/* set flag here since we don't want the code below to activate
|
|
* the pad again */
|
|
delay = TRUE;
|
|
}
|
|
gst_object_unref (GST_OBJECT (peer));
|
|
}
|
|
|
|
/* all other conditions are just push based pads */
|
|
if (!delay) {
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
|
|
"%sactivating pad %s", (active ? "" : "(de)"),
|
|
GST_OBJECT_NAME (pad));
|
|
|
|
result &= gst_pad_set_active (pad,
|
|
(active ? GST_ACTIVATE_PUSH : GST_ACTIVATE_NONE));
|
|
}
|
|
}
|
|
gst_object_unref (GST_OBJECT (pad));
|
|
|
|
GST_LOCK (element);
|
|
if (cookie != element->pads_cookie)
|
|
goto restart;
|
|
}
|
|
GST_UNLOCK (element);
|
|
|
|
return result;
|
|
}
|
|
|
|
/* is called with STATE_LOCK */
|
|
static GstElementStateReturn
|
|
gst_element_change_state (GstElement * element)
|
|
{
|
|
GstElementState old_state;
|
|
gint old_pending, old_transition;
|
|
GstElementStateReturn result = GST_STATE_SUCCESS;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), GST_STATE_FAILURE);
|
|
|
|
old_state = GST_STATE (element);
|
|
old_pending = GST_STATE_PENDING (element);
|
|
old_transition = GST_STATE_TRANSITION (element);
|
|
|
|
/* if the element already is in the given state, we just return success */
|
|
if (old_pending == GST_STATE_VOID_PENDING ||
|
|
old_state == GST_STATE_PENDING (element)) {
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
|
|
"element is already in the %s state",
|
|
gst_element_state_get_name (old_state));
|
|
return GST_STATE_SUCCESS;
|
|
}
|
|
|
|
GST_CAT_LOG_OBJECT (GST_CAT_STATES, element,
|
|
"default handler tries setting state from %s to %s (%04x)",
|
|
gst_element_state_get_name (old_state),
|
|
gst_element_state_get_name (old_pending), old_transition);
|
|
|
|
switch (old_transition) {
|
|
case GST_STATE_NULL_TO_READY:
|
|
break;
|
|
case GST_STATE_READY_TO_PAUSED:
|
|
if (!gst_element_pads_activate (element, TRUE)) {
|
|
result = GST_STATE_FAILURE;
|
|
}
|
|
break;
|
|
case GST_STATE_PAUSED_TO_PLAYING:
|
|
GST_LOCK (element);
|
|
if (GST_ELEMENT_MANAGER (element)) {
|
|
element->base_time =
|
|
GST_ELEMENT (GST_ELEMENT_MANAGER (element))->base_time;
|
|
}
|
|
GST_UNLOCK (element);
|
|
break;
|
|
case GST_STATE_PLAYING_TO_PAUSED:
|
|
break;
|
|
case GST_STATE_PAUSED_TO_READY:
|
|
element->base_time = 0;
|
|
if (!gst_element_pads_activate (element, FALSE)) {
|
|
result = GST_STATE_FAILURE;
|
|
}
|
|
break;
|
|
case GST_STATE_READY_TO_NULL:
|
|
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 (old_state),
|
|
gst_element_state_get_name (old_pending));
|
|
break;
|
|
}
|
|
|
|
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.
|
|
*/
|
|
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);
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_REFCOUNTING, element, "dispose");
|
|
|
|
/* ref so we don't hit 0 again */
|
|
gst_object_ref (GST_OBJECT (object));
|
|
gst_element_set_state (element, GST_STATE_NULL);
|
|
|
|
/* first we break all our links with the ouside */
|
|
while (element->pads) {
|
|
gst_element_remove_pad (element, GST_PAD (element->pads->data));
|
|
}
|
|
|
|
g_assert (element->pads == 0);
|
|
|
|
GST_LOCK (element);
|
|
gst_object_replace ((GstObject **) & element->manager, NULL);
|
|
gst_object_replace ((GstObject **) & element->clock, NULL);
|
|
GST_UNLOCK (element);
|
|
|
|
GST_STATE_LOCK (element);
|
|
if (element->state_cond)
|
|
g_cond_free (element->state_cond);
|
|
element->state_cond = NULL;
|
|
GST_STATE_UNLOCK (element);
|
|
|
|
GST_CAT_INFO_OBJECT (GST_CAT_REFCOUNTING, element, "dispose parent");
|
|
|
|
G_OBJECT_CLASS (parent_class)->dispose (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;
|
|
gint nspecs, 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, "name", GST_ELEMENT_NAME (element));
|
|
|
|
if (oclass->elementfactory != NULL) {
|
|
GstElementFactory *factory = (GstElementFactory *) oclass->elementfactory;
|
|
|
|
xmlNewChild (parent, NULL, "type", GST_PLUGIN_FEATURE (factory)->name);
|
|
}
|
|
|
|
/* FIXME: what is this? */
|
|
/* if (element->manager) */
|
|
/* xmlNewChild(parent, NULL, "manager", GST_ELEMENT_NAME(element->manager)); */
|
|
|
|
/* 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, "param", NULL);
|
|
xmlNewChild (param, NULL, "name", 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, "value", contents);
|
|
g_free (contents);
|
|
|
|
g_value_unset (&value);
|
|
}
|
|
}
|
|
|
|
pads = GST_ELEMENT_PADS (element);
|
|
|
|
while (pads) {
|
|
GstPad *pad = GST_PAD (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, "pad", NULL);
|
|
|
|
gst_object_save_thyself (GST_OBJECT (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 (children->name, "param")) {
|
|
xmlNodePtr child = children->xmlChildrenNode;
|
|
|
|
while (child) {
|
|
if (!strcmp (child->name, "name")) {
|
|
name = xmlNodeGetContent (child);
|
|
} else if (!strcmp (child->name, "value")) {
|
|
value = 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 (children->name, "pad")) {
|
|
gst_pad_load_and_link (children, GST_OBJECT (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_manager_func (GstElement * element, GstPipeline * manager)
|
|
{
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PARENTAGE, element, "setting manager to %p",
|
|
manager);
|
|
|
|
/* setting the manager cannot increase the refcount */
|
|
GST_LOCK (element);
|
|
GST_ELEMENT_MANAGER (element) = manager;
|
|
GST_UNLOCK (element);
|
|
}
|
|
|
|
static void
|
|
gst_element_set_bus_func (GstElement * element, GstBus * bus)
|
|
{
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PARENTAGE, element, "setting bus to %p", bus);
|
|
|
|
GST_LOCK (element);
|
|
gst_object_replace ((GstObject **) & GST_ELEMENT_BUS (element),
|
|
GST_OBJECT (bus));
|
|
GST_UNLOCK (element);
|
|
}
|
|
|
|
static void
|
|
gst_element_set_scheduler_func (GstElement * element, GstScheduler * scheduler)
|
|
{
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PARENTAGE, element, "setting scheduler to %p",
|
|
scheduler);
|
|
|
|
GST_LOCK (element);
|
|
gst_object_replace ((GstObject **) & GST_ELEMENT_SCHEDULER (element),
|
|
GST_OBJECT (scheduler));
|
|
GST_UNLOCK (element);
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_manager:
|
|
* @element: a #GstElement to set the manager of.
|
|
* @manager: the #GstManager to set.
|
|
*
|
|
* Sets the manager of the element. For internal use only, unless you're
|
|
* writing a new bin subclass.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
void
|
|
gst_element_set_manager (GstElement * element, GstPipeline * manager)
|
|
{
|
|
GstElementClass *oclass;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->set_manager)
|
|
oclass->set_manager (element, manager);
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_element_get_manager:
|
|
* @element: a #GstElement to get the manager of.
|
|
*
|
|
* Returns the manager of the element.
|
|
*
|
|
* Returns: the element's #GstPipeline. unref after usage.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstPipeline *
|
|
gst_element_get_manager (GstElement * element)
|
|
{
|
|
GstPipeline *result = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), result);
|
|
|
|
GST_LOCK (element);
|
|
result = GST_ELEMENT_MANAGER (element);
|
|
gst_object_ref (GST_OBJECT (result));
|
|
GST_UNLOCK (element);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_bus:
|
|
* @element: a #GstElement to set the bus of.
|
|
* @bus: the #GstBus to set.
|
|
*
|
|
* Sets the bus of the element. For internal use only, unless you're
|
|
* testing elements.
|
|
*/
|
|
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.
|
|
*
|
|
* Returns: the element's #GstBus.
|
|
*/
|
|
GstBus *
|
|
gst_element_get_bus (GstElement * element)
|
|
{
|
|
GstBus *result = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), result);
|
|
|
|
GST_LOCK (element);
|
|
result = GST_ELEMENT_BUS (element);
|
|
GST_UNLOCK (element);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_set_scheduler:
|
|
* @element: a #GstElement to set the scheduler of.
|
|
* @scheduler: the #GstScheduler to set.
|
|
*
|
|
* Sets the scheduler of the element. For internal use only, unless you're
|
|
* testing elements.
|
|
*/
|
|
void
|
|
gst_element_set_scheduler (GstElement * element, GstScheduler * scheduler)
|
|
{
|
|
GstElementClass *oclass;
|
|
|
|
g_return_if_fail (GST_IS_ELEMENT (element));
|
|
|
|
oclass = GST_ELEMENT_GET_CLASS (element);
|
|
|
|
if (oclass->set_scheduler)
|
|
oclass->set_scheduler (element, scheduler);
|
|
}
|
|
|
|
/**
|
|
* gst_element_get_scheduler:
|
|
* @element: a #GstElement to get the scheduler of.
|
|
*
|
|
* Returns the scheduler of the element.
|
|
*
|
|
* Returns: the element's #GstScheduler.
|
|
*/
|
|
GstScheduler *
|
|
gst_element_get_scheduler (GstElement * element)
|
|
{
|
|
GstScheduler *result = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT (element), result);
|
|
|
|
GST_LOCK (element);
|
|
result = GST_ELEMENT_SCHEDULER (element);
|
|
GST_UNLOCK (element);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_create_task:
|
|
* @element: a #GstElement to create the task for.
|
|
* @func: the taskfunction to run
|
|
* @data: user data passed to the taskfunction.
|
|
*
|
|
* Creates a new GstTask. This function uses the current manager of
|
|
* the element to instantiate a new task.
|
|
*
|
|
* Returns: the newly created #GstTask.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstTask *
|
|
gst_element_create_task (GstElement * element, GstTaskFunction func,
|
|
gpointer data)
|
|
{
|
|
GstScheduler *sched;
|
|
GstTask *result = NULL;
|
|
|
|
GST_LOCK (element);
|
|
sched = GST_ELEMENT_SCHEDULER (element);
|
|
gst_object_ref (GST_OBJECT (sched));
|
|
GST_UNLOCK (element);
|
|
if (sched) {
|
|
result = gst_scheduler_create_task (sched, func, data);
|
|
gst_object_unref (GST_OBJECT (sched));
|
|
}
|
|
|
|
return result;
|
|
}
|