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gstreamer/gst/gstelement.c
Andy Wingo 2b12a668da use contents of GST_REGISTRY variable if --gst-registry is not set 
Original commit message from CVS:
use contents of GST_REGISTRY variable if --gst-registry is not set
2002-05-05 17:45:41 +00:00

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* 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.
*/
/* #define GST_DEBUG_ENABLED */
#include <glib.h>
#include <stdarg.h>
#include "gst_private.h"
#include "gstelement.h"
#include "gstextratypes.h"
#include "gstbin.h"
#include "gstscheduler.h"
#include "gstevent.h"
#include "gstutils.h"
/* Element signals and args */
enum {
STATE_CHANGE,
NEW_PAD,
PAD_REMOVED,
ERROR,
EOS,
DEEP_NOTIFY,
LAST_SIGNAL
};
enum {
ARG_0,
/* FILL ME */
};
#define CLASS(element) GST_ELEMENT_CLASS (G_OBJECT_GET_CLASS (element))
static void gst_element_class_init (GstElementClass *klass);
static void gst_element_init (GstElement *element);
static void gst_element_base_class_init (GstElementClass *klass);
static void gst_element_set_property (GObject *object, guint prop_id,
const GValue *value, GParamSpec *pspec);
static void gst_element_get_property (GObject *object, guint prop_id, GValue *value,
GParamSpec *pspec);
static void gst_element_dispatch_properties_changed (GObject * object, guint n_pspecs, GParamSpec **pspecs);
static void gst_element_dispose (GObject *object);
static GstElementStateReturn gst_element_change_state (GstElement *element);
static void gst_element_error_func (GstElement* element, GstElement *source, gchar *errormsg);
#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),
(GBaseInitFunc)gst_element_base_class_init,
NULL,
(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[ERROR] =
g_signal_new ("error", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstElementClass, error), NULL, NULL,
gst_marshal_VOID__OBJECT_STRING, G_TYPE_NONE, 2,
G_TYPE_OBJECT, G_TYPE_STRING);
gst_element_signals[EOS] =
g_signal_new ("eos", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstElementClass,eos), NULL, NULL,
gst_marshal_VOID__VOID, G_TYPE_NONE, 0);
gst_element_signals[DEEP_NOTIFY] =
g_signal_new ("deep_notify", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST | G_SIGNAL_NO_RECURSE | G_SIGNAL_DETAILED | G_SIGNAL_NO_HOOKS,
G_STRUCT_OFFSET (GstElementClass, deep_notify), NULL, NULL,
gst_marshal_VOID__OBJECT_PARAM, G_TYPE_NONE,
2, G_TYPE_OBJECT, G_TYPE_PARAM);
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_element_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_element_get_property);
/* see the comments at gst_element_dispatch_properties_changed */
gobject_class->dispatch_properties_changed
= GST_DEBUG_FUNCPTR (gst_element_dispatch_properties_changed);
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->error = GST_DEBUG_FUNCPTR (gst_element_error_func);
klass->elementfactory = NULL;
klass->padtemplates = NULL;
klass->numpadtemplates = 0;
}
static void
gst_element_base_class_init (GstElementClass *klass)
{
GObjectClass *gobject_class;
gobject_class = (GObjectClass*) klass;
gobject_class->set_property = GST_DEBUG_FUNCPTR(gst_element_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR(gst_element_get_property);
}
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 = NULL;
element->loopfunc = NULL;
element->sched = NULL;
element->sched_private = NULL;
element->state_mutex = g_mutex_new ();
element->state_cond = g_cond_new ();
}
static void
gst_element_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
GstElementClass *oclass = CLASS (object);
if (oclass->set_property)
(oclass->set_property) (object, prop_id, value, pspec);
}
static void
gst_element_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
GstElementClass *oclass = CLASS (object);
if (oclass->get_property)
(oclass->get_property) (object, prop_id, value, pspec);
}
/* Changing a GObject property of an element will result in "deep_notify"
* signals being emitted by the element itself, as well as in each parent
* element. This is so that an application can connect a listener to the
* top-level bin to catch property-change notifications for all contained
* elements. */
static void
gst_element_dispatch_properties_changed (GObject *object,
guint n_pspecs,
GParamSpec **pspecs)
{
GstObject *gst_object;
guint i;
/* do the standard dispatching */
G_OBJECT_CLASS (parent_class)->dispatch_properties_changed (object, n_pspecs, pspecs);
/* now let the parent dispatch those, too */
gst_object = GST_OBJECT (object);
while (gst_object)
{
/* need own category? */
for (i = 0; i < n_pspecs; i++) {
GST_DEBUG (GST_CAT_EVENT, "deep notification from %s to %s (%s)", GST_OBJECT_NAME (object),
GST_OBJECT_NAME (gst_object), pspecs[i]->name);
g_signal_emit (gst_object, gst_element_signals[DEEP_NOTIFY], g_quark_from_string (pspecs[i]->name),
(GstObject *) object, pspecs[i]);
}
gst_object = GST_OBJECT_PARENT (gst_object);
}
}
static GstPad*
gst_element_request_pad (GstElement *element, GstPadTemplate *templ, const gchar* name)
{
GstPad *newpad = NULL;
GstElementClass *oclass;
oclass = CLASS (element);
if (oclass->request_new_pad)
newpad = (oclass->request_new_pad)(element, templ, name);
return newpad;
}
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 = CLASS (element);
if (oclass->release_pad)
(oclass->release_pad) (element, pad);
}
/**
* gst_element_set_name:
* @element: a #GstElement to set name of
* @name: new name of element
*
* Sets the name of the element, getting rid of the old name if there was
* one.
*/
void
gst_element_set_name (GstElement *element, const gchar *name)
{
g_return_if_fail (element != NULL);
g_return_if_fail (GST_IS_ELEMENT (element));
gst_object_set_name (GST_OBJECT (element), name);
}
/**
* gst_element_get_name:
* @element: a #GstElement to get name of
*
* Gets the name of the element.
*
* Returns: name of the element
*/
const gchar*
gst_element_get_name (GstElement *element)
{
g_return_val_if_fail (element != NULL, NULL);
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
return GST_OBJECT_NAME (element);
}
/**
* gst_element_set_parent:
* @element: a #GstElement to set parent of
* @parent: new parent of the object
*
* Sets the parent of the element.
*/
void
gst_element_set_parent (GstElement *element, GstObject *parent)
{
g_return_if_fail (element != NULL);
g_return_if_fail (GST_IS_ELEMENT (element));
g_return_if_fail (GST_OBJECT_PARENT (element) == NULL);
g_return_if_fail (parent != NULL);
g_return_if_fail (GST_IS_OBJECT (parent));
g_return_if_fail ((gpointer)element != (gpointer)parent);
gst_object_set_parent (GST_OBJECT (element), parent);
}
/**
* gst_element_get_parent:
* @element: a #GstElement to get the parent of
*
* Gets the parent of the element.
*
* Returns: the #GstElement parent of the element
*/
GstObject*
gst_element_get_parent (GstElement *element)
{
g_return_val_if_fail (element != NULL, NULL);
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
return GST_OBJECT_PARENT (element);
}
/**
* 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.
*/
void
gst_element_set_clock (GstElement *element, GstClock *clock)
{
g_return_if_fail (element != NULL);
g_return_if_fail (GST_IS_ELEMENT (element));
if (element->setclockfunc)
element->setclockfunc (element, clock);
}
/**
* gst_element_get_clock:
* @element: a #GstElement to get the clock of
*
* Gets the clock of the element.
*
* Returns: the #GstClock of the element.
*/
GstClock*
gst_element_get_clock (GstElement *element)
{
g_return_val_if_fail (element != NULL, NULL);
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
if (element->getclockfunc)
return element->getclockfunc (element);
return NULL;
}
/**
* gst_element_clock_wait:
* @element: a #GstElement
* @clock: the #GstClock to use
* @time: the #GstClockTime to wait for on the clock
*
* Waits for a specific time on the clock.
*
* Returns: the #GstClockReturn result of the wait operation
*/
GstClockReturn
gst_element_clock_wait (GstElement *element, GstClock *clock, GstClockTime time)
{
g_return_val_if_fail (element != NULL, GST_CLOCK_ERROR);
g_return_val_if_fail (GST_IS_ELEMENT (element), GST_CLOCK_ERROR);
if (GST_ELEMENT_SCHED (element)) {
return gst_scheduler_clock_wait (GST_ELEMENT_SCHED (element), element, clock, time);
}
else
return GST_CLOCK_TIMEOUT;
}
/**
* gst_element_add_pad:
* @element: element to add pad to
* @pad: pad to add
*
* Add a pad (connection point) to the element, setting the parent of the
* pad to the element (and thus adding a reference).
*/
void
gst_element_add_pad (GstElement *element, GstPad *pad)
{
g_return_if_fail (element != NULL);
g_return_if_fail (GST_IS_ELEMENT (element));
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
/* first check to make sure the pad's parent is already set */
g_return_if_fail (GST_PAD_PARENT (pad) == NULL);
/* then check to see if there's already a pad by that name here */
g_return_if_fail (gst_object_check_uniqueness (element->pads, GST_PAD_NAME(pad)) == TRUE);
/* set the pad's parent */
GST_DEBUG (GST_CAT_ELEMENT_PADS,"setting parent of pad '%s' to '%s'",
GST_PAD_NAME (pad), GST_ELEMENT_NAME (element));
gst_object_set_parent (GST_OBJECT (pad), GST_OBJECT (element));
/* add it to the list */
element->pads = g_list_append (element->pads, pad);
element->numpads++;
if (gst_pad_get_direction (pad) == GST_PAD_SRC)
element->numsrcpads++;
else
element->numsinkpads++;
/* emit the NEW_PAD signal */
g_signal_emit (G_OBJECT (element), gst_element_signals[NEW_PAD], 0, pad);
}
/**
* gst_element_remove_pad:
* @element: element to remove pad from
* @pad: pad to remove
*
* Remove a pad (connection point) from the element,
*/
void
gst_element_remove_pad (GstElement *element, GstPad *pad)
{
g_return_if_fail (element != NULL);
g_return_if_fail (GST_IS_ELEMENT (element));
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (GST_PAD_PARENT (pad) == element);
/* check to see if the pad is still connected */
/* FIXME: what if someone calls _remove_pad instead of
_remove_ghost_pad? */
if (GST_IS_REAL_PAD (pad)) {
g_return_if_fail (GST_RPAD_PEER (pad) == NULL);
}
/* remove it from the list */
element->pads = g_list_remove (element->pads, pad);
element->numpads--;
if (gst_pad_get_direction (pad) == GST_PAD_SRC)
element->numsrcpads--;
else
element->numsinkpads--;
g_signal_emit (G_OBJECT (element), gst_element_signals[PAD_REMOVED], 0, pad);
gst_object_unparent (GST_OBJECT (pad));
}
/**
* gst_element_add_ghost_pad:
* @element: element to add ghost pad to
* @pad: pad from which the new ghost pad will be created
* @name: name of the new ghost pad
*
* Create a ghost pad from the given pad, and add it to the list of pads
* for this element.
*
* Returns: the added ghost pad or NULL, if no ghost pad was created.
*/
GstPad *
gst_element_add_ghost_pad (GstElement *element, GstPad *pad, gchar *name)
{
GstPad *ghostpad;
g_return_val_if_fail (element != NULL, NULL);
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
/* then check to see if there's already a pad by that name here */
g_return_val_if_fail (gst_object_check_uniqueness (element->pads, name) == TRUE, NULL);
GST_DEBUG(GST_CAT_ELEMENT_PADS,"creating new ghost pad called %s, from pad %s:%s",
name,GST_DEBUG_PAD_NAME(pad));
ghostpad = gst_ghost_pad_new (name, pad);
/* add it to the list */
GST_DEBUG(GST_CAT_ELEMENT_PADS,"adding ghost pad %s to element %s",
name, GST_ELEMENT_NAME (element));
element->pads = g_list_append (element->pads, ghostpad);
element->numpads++;
/* set the parent of the ghostpad */
gst_object_set_parent (GST_OBJECT (ghostpad), GST_OBJECT (element));
GST_DEBUG(GST_CAT_ELEMENT_PADS,"added ghostpad %s:%s",GST_DEBUG_PAD_NAME(ghostpad));
/* emit the NEW_GHOST_PAD signal */
g_signal_emit (G_OBJECT (element), gst_element_signals[NEW_PAD], 0, ghostpad);
return ghostpad;
}
/**
* gst_element_remove_ghost_pad:
* @element: element to remove the ghost pad from
* @pad: ghost pad to remove
*
* removes a ghost pad from an element
*/
void
gst_element_remove_ghost_pad (GstElement *element, GstPad *pad)
{
g_return_if_fail (element != NULL);
g_return_if_fail (GST_IS_ELEMENT (element));
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_GHOST_PAD (pad));
/* FIXME this is redundant?
* wingo 10-july-2001: I don't think so, you have to actually remove the pad
* from the element. gst_pad_remove_ghost_pad just removes the ghostpad from
* the real pad's ghost pad list
*/
gst_pad_remove_ghost_pad (GST_PAD (GST_PAD_REALIZE (pad)), pad);
gst_element_remove_pad (element, pad);
}
/**
* gst_element_get_pad:
* @element: element to find pad of
* @name: name of pad to retrieve
*
* Retrieve a pad from the element by name.
*
* Returns: requested pad if found, otherwise NULL.
*/
GstPad*
gst_element_get_pad (GstElement *element, const gchar *name)
{
GstPad *pad;
g_return_val_if_fail (element != NULL, NULL);
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
g_return_val_if_fail (name != NULL, NULL);
if ((pad = gst_element_get_static_pad (element, name)))
return pad;
pad = gst_element_get_request_pad (element, name);
return pad;
}
/**
* gst_element_get_static_pad:
* @element: element to find pad of
* @name: name of pad to retrieve
*
* Retrieve a pad from the element by name. This version only retrieves
* already-existing (i.e. 'static') pads.
*
* Returns: requested pad if found, otherwise NULL.
*/
GstPad *
gst_element_get_static_pad (GstElement *element, const gchar *name)
{
GList *walk;
g_return_val_if_fail (element != NULL, NULL);
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
g_return_val_if_fail (name != NULL, NULL);
walk = element->pads;
while (walk) {
GstPad *pad;
pad = GST_PAD(walk->data);
if (strcmp (GST_PAD_NAME(pad), name) == 0) {
GST_INFO (GST_CAT_ELEMENT_PADS, "found pad %s:%s", GST_DEBUG_PAD_NAME (pad));
return pad;
}
walk = g_list_next (walk);
}
GST_INFO (GST_CAT_ELEMENT_PADS, "no such pad '%s' in element \"%s\"", name, GST_OBJECT_NAME (element));
return NULL;
}
/**
* gst_element_get_request_pad:
* @element: element to find pad of
* @name: name of pad to retrieve
*
* Retrieve a pad from the element by name. This version only retrieves
* request pads.
*
* Returns: requested pad 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;
g_return_val_if_fail (element != NULL, NULL);
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
g_return_val_if_fail (name != NULL, NULL);
if (strstr (name, "%")) {
templ = gst_element_get_pad_template (element, name);
req_name = NULL;
if (templ)
templ_found = TRUE;
} else {
list = gst_element_get_pad_template_list(element);
while (!templ_found && list) {
templ = (GstPadTemplate*) list->data;
if (templ->presence == GST_PAD_REQUEST) {
/* we know that %s and %d are the only possibilities because of sanity
checks in gst_pad_template_new */
GST_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_list:
* @element: element to get pads of
*
* Retrieve a list of the pads associated with the element.
*
* Returns: GList of pads
*/
GList*
gst_element_get_pad_list (GstElement *element)
{
g_return_val_if_fail (element != NULL, NULL);
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
/* return the list of pads */
return element->pads;
}
/**
* gst_element_class_add_pad_template:
* @klass: element class to add padtemplate to
* @templ: padtemplate to add
*
* Add a padtemplate to an element class. This is useful if you have derived a custom
* bin and wish to provide an on-request pad at runtime. Plugin writers should use
* gst_element_factory_add_pad_template instead.
*/
void
gst_element_class_add_pad_template (GstElementClass *klass, GstPadTemplate *templ)
{
g_return_if_fail (klass != NULL);
g_return_if_fail (GST_IS_ELEMENT_CLASS (klass));
g_return_if_fail (templ != NULL);
g_return_if_fail (GST_IS_PAD_TEMPLATE (templ));
klass->padtemplates = g_list_append (klass->padtemplates, templ);
klass->numpadtemplates++;
}
/**
* gst_element_get_pad_template_list:
* @element: element to get padtemplates of
*
* Retrieve a list of the padtemplates associated with the element.
*
* Returns: GList of padtemplates
*/
GList*
gst_element_get_pad_template_list (GstElement *element)
{
g_return_val_if_fail (element != NULL, NULL);
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
return CLASS (element)->padtemplates;
}
/**
* gst_element_get_pad_template:
* @element: element to get padtemplate of
* @name: the name of the padtemplate to get.
*
* Retrieve a padtemplate from this element with the
* given name.
*
* Returns: the padtemplate with the given name. No unreferencing is necessary.
*/
GstPadTemplate*
gst_element_get_pad_template (GstElement *element, const guchar *name)
{
GList *padlist;
g_return_val_if_fail (element != NULL, NULL);
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
g_return_val_if_fail (name != NULL, NULL);
padlist = gst_element_get_pad_template_list (element);
while (padlist) {
GstPadTemplate *padtempl = (GstPadTemplate*) padlist->data;
if (!strcmp (padtempl->name_template, name))
return padtempl;
padlist = g_list_next (padlist);
}
return NULL;
}
/**
* gst_element_get_compatible_pad_template:
* @element: element to get padtemplate of
* @templ: a template to find a compatible template for
*
* Generate a padtemplate for this element compatible with the given
* template, ie able to link to it.
*
* Returns: the padtemplate. No unreferencing is necessary.
*/
GstPadTemplate*
gst_element_get_compatible_pad_template (GstElement *element, GstPadTemplate *compattempl)
{
GstPadTemplate *newtempl = NULL;
GList *padlist;
GST_DEBUG(GST_CAT_ELEMENT_PADS,"gst_element_get_pad_template_by_compatible()");
g_return_val_if_fail (element != NULL, NULL);
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
g_return_val_if_fail (compattempl != NULL, NULL);
padlist = gst_element_get_pad_template_list (element);
while (padlist) {
GstPadTemplate *padtempl = (GstPadTemplate*) padlist->data;
gboolean compat = FALSE;
/* Ignore name
* Ignore presence
* Check direction (must be opposite)
* Check caps
*/
GST_DEBUG(GST_CAT_CAPS,"checking direction and caps");
if (padtempl->direction == GST_PAD_SRC &&
compattempl->direction == GST_PAD_SINK) {
GST_DEBUG(GST_CAT_CAPS,"compatible direction: found src pad template");
compat = gst_caps_check_compatibility(GST_PAD_TEMPLATE_CAPS (padtempl),
GST_PAD_TEMPLATE_CAPS (compattempl));
GST_DEBUG(GST_CAT_CAPS,"caps are %scompatible", (compat?"":"not "));
} else if (padtempl->direction == GST_PAD_SINK &&
compattempl->direction == GST_PAD_SRC) {
GST_DEBUG(GST_CAT_CAPS,"compatible direction: found sink pad template");
compat = gst_caps_check_compatibility(GST_PAD_TEMPLATE_CAPS (compattempl),
GST_PAD_TEMPLATE_CAPS (padtempl));
GST_DEBUG(GST_CAT_CAPS,"caps are %scompatible", (compat?"":"not "));
}
if (compat) {
newtempl = padtempl;
break;
}
padlist = g_list_next (padlist);
}
return newtempl;
}
/**
* gst_element_request_compatible_pad:
* @element: element to request a new pad from
* @templ: a pad template to which the new pad should be able to connect
*
* Request a new pad from the element. The template will
* be used to decide what type of pad to create. This function
* is typically used for elements with a padtemplate with presence
* GST_PAD_REQUEST.
*
* Returns: the new pad that was created.
*/
GstPad*
gst_element_request_compatible_pad (GstElement *element, GstPadTemplate *templ)
{
GstPadTemplate *templ_new;
GstPad *pad = NULL;
g_return_val_if_fail (element != NULL, NULL);
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
g_return_val_if_fail (templ != NULL, NULL);
templ_new = gst_element_get_compatible_pad_template (element, templ);
if (templ_new != NULL)
pad = gst_element_request_pad (element, templ_new, NULL);
return pad;
}
/**
* gst_element_get_compatible_pad_filtered:
* @element: the element in which the pad should be found
* @pad: the pad to find a compatible one for
* @filtercaps: the caps to use as a filter
*
* Looks for an unconnected pad to which the given pad can connect to.
* It is not guaranteed that connecting the pads will work, though
* it should work in most cases.
*
* Returns: the pad to which a connection can be made
*/
GstPad*
gst_element_get_compatible_pad_filtered (GstElement *element, GstPad *pad, GstCaps *filtercaps)
{
GList *pads;
GstPadTemplate *templ;
GstCaps *templcaps;
GstPad *foundpad = NULL;
/* checks */
g_return_val_if_fail (element != NULL, NULL);
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
/* let's use the real pad */
pad = (GstPad *) GST_PAD_REALIZE (pad);
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (GST_RPAD_PEER (pad) == NULL, NULL);
/* try to get an existing unconnected pad */
pads = gst_element_get_pad_list (element);
while (pads) {
GstPad *current = GST_PAD (pads->data);
if ((GST_PAD_PEER (GST_PAD_REALIZE (current)) == NULL) &&
gst_pad_can_connect_filtered (pad, current, filtercaps)) {
return current;
}
pads = g_list_next (pads);
}
/* try to create a new one */
/* requesting is a little crazy, we need a template. Let's create one */
if (filtercaps != NULL) {
templcaps = gst_caps_intersect (filtercaps, (GstCaps *) GST_RPAD_CAPS (pad));
if (templcaps == NULL)
return NULL;
} else {
templcaps = gst_caps_copy (gst_pad_get_caps (pad));
}
templ = gst_pad_template_new ((gchar *) GST_PAD_NAME (pad), GST_RPAD_DIRECTION (pad),
GST_PAD_ALWAYS, templcaps, NULL);
foundpad = gst_element_request_compatible_pad (element, templ);
gst_object_unref (GST_OBJECT (templ)); /* this will take care of the caps too */
/* FIXME: this is broken, but it's in here so autoplugging elements that don't
have caps on their source padtemplates (spider) can connect... */
if (!foundpad && !filtercaps) {
templ = gst_pad_template_new ((gchar *) GST_PAD_NAME (pad), GST_RPAD_DIRECTION (pad),
GST_PAD_ALWAYS, NULL, NULL);
foundpad = gst_element_request_compatible_pad (element, templ);
gst_object_unref (GST_OBJECT (templ));
}
return foundpad;
}
/**
* gst_element_get_compatible_pad:
* @element: the element in which the pad should be found
* @pad: the pad to find a compatible one for
*
* Looks for an unconnected pad to which the given pad can connect to.
* It is not guaranteed that connecting the pads will work, though
* it should work in most cases.
*
* Returns: the pad to which a connection can be made
*/
GstPad*
gst_element_get_compatible_pad (GstElement *element, GstPad *pad)
{
return gst_element_get_compatible_pad_filtered (element, pad, NULL);
}
/**
* gst_element_connect_filtered:
* @src: the element containing source pad
* @dest: the element containing destination pad
* @filtercaps: the caps to use as filter
*
* Connect the source to the destination element using the filtercaps.
* The connection must be from source to destination, the other
* direction will not be tried.
* The functions looks for existing pads that aren't connected yet.
+ It will use request pads if possible. But both pads will not be requested.
* If multiple connections are possible, only one is established.
*
* Returns: TRUE if the elements could be connected.
*/
gboolean
gst_element_connect_filtered (GstElement *src, GstElement *dest,
GstCaps *filtercaps)
{
GList *srcpads, *destpads, *srctempls, *desttempls, *l;
GstPad *srcpad, *destpad;
GstPadTemplate *srctempl, *desttempl;
/* checks */
g_return_val_if_fail (src != NULL, FALSE);
g_return_val_if_fail (GST_IS_ELEMENT(src), FALSE);
g_return_val_if_fail (dest != NULL, FALSE);
g_return_val_if_fail (GST_IS_ELEMENT(dest), FALSE);
GST_DEBUG (GST_CAT_ELEMENT_PADS, "attempting to connect element %s to element %s", GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (dest));
/* loop through the existing pads in the source */
srcpads = gst_element_get_pad_list (src);
destpads = gst_element_get_pad_list (dest);
if (srcpads || destpads) {
while (srcpads) {
srcpad = (GstPad *) GST_PAD_REALIZE (srcpads->data);
if ((GST_RPAD_DIRECTION (srcpad) == GST_PAD_SRC) &&
(GST_PAD_PEER (srcpad) == NULL)) {
destpad = gst_element_get_compatible_pad_filtered (dest, srcpad, filtercaps);
if (destpad && gst_pad_connect_filtered (srcpad, destpad, filtercaps)) {
GST_DEBUG (GST_CAT_ELEMENT_PADS, "connected pad %s:%s to pad %s:%s", GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (destpad));
return TRUE;
}
}
srcpads = g_list_next (srcpads);
}
/* loop through the existing pads in the destination */
while (destpads) {
destpad = (GstPad *) GST_PAD_REALIZE (destpads->data);
if ((GST_RPAD_DIRECTION (destpad) == GST_PAD_SINK) &&
(GST_PAD_PEER (destpad) == NULL)) {
srcpad = gst_element_get_compatible_pad_filtered (src, destpad, filtercaps);
if (srcpad && gst_pad_connect_filtered (srcpad, destpad, filtercaps)) {
GST_DEBUG (GST_CAT_ELEMENT_PADS, "connected pad %s:%s to pad %s:%s", GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (destpad));
return TRUE;
}
}
destpads = g_list_next (destpads);
}
}
GST_DEBUG (GST_CAT_ELEMENT_PADS, "we might have request pads on both sides, checking...");
srctempls = gst_element_get_pad_template_list (src);
desttempls = gst_element_get_pad_template_list (dest);
if (srctempls && desttempls) {
while (srctempls) {
srctempl = (GstPadTemplate*) srctempls->data;
if (srctempl->presence == GST_PAD_REQUEST) {
for (l=desttempls; l; l=l->next) {
desttempl = (GstPadTemplate*) desttempls->data;
if (desttempl->presence == GST_PAD_REQUEST && desttempl->direction != srctempl->direction) {
if (gst_caps_check_compatibility (gst_pad_template_get_caps (srctempl),
gst_pad_template_get_caps (desttempl))) {
srcpad = gst_element_get_request_pad (src, srctempl->name_template);
destpad = gst_element_get_request_pad (dest, desttempl->name_template);
if (gst_pad_connect_filtered (srcpad, destpad, filtercaps)) {
GST_DEBUG (GST_CAT_ELEMENT_PADS, "connected pad %s:%s to pad %s:%s",
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (destpad));
return TRUE;
}
/* FIXME: we have extraneous request pads lying around */
}
}
}
}
srctempls = srctempls->next;
}
}
GST_DEBUG (GST_CAT_ELEMENT_PADS, "no connection possible from %s to %s", GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (dest));
return FALSE;
}
/**
* gst_element_connect_many:
* @element_1: the first element in the connection chain
* @element_2: the second element in the connection chain
* @...: NULL-terminated list of elements to connect in order
*
* Chain together a series of elements. Uses #gst_element_connect.
*
* Returns: TRUE on success, FALSE otherwise.
*/
gboolean
gst_element_connect_many (GstElement *element_1, GstElement *element_2, ...)
{
va_list args;
g_return_val_if_fail (element_1 != NULL && element_2 != NULL, FALSE);
g_return_val_if_fail (GST_IS_ELEMENT (element_1) && GST_IS_ELEMENT (element_2), FALSE);
va_start (args, element_2);
while (element_2) {
if (!gst_element_connect (element_1, element_2))
return FALSE;
element_1 = element_2;
element_2 = va_arg (args, GstElement*);
}
va_end (args);
return TRUE;
}
/**
* gst_element_connect:
* @src: element containing source pad
* @dest: element containing destination pad
*
* Connect the source to the destination element.
* The connection must be from source to destination, the other
* direction will not be tried.
* The functions looks for existing pads and request pads that aren't
* connected yet. If multiple connections are possible, only one is
* established.
*
* Returns: TRUE if the elements could be connected.
*/
gboolean
gst_element_connect (GstElement *src, GstElement *dest)
{
return gst_element_connect_filtered (src, dest, NULL);
}
/**
* gst_element_connect_pads_filtered:
* @src: element containing source pad
* @srcpadname: name of pad in source element
* @dest: element containing destination pad
* @destpadname: name of pad in destination element
* @filtercaps: the caps to use as a filter
*
* Connect the two named pads of the source and destination elements.
* Side effect is that if one of the pads has no parent, it becomes a
* child of the parent of the other element. If they have different
* parents, the connection fails.
*
* Returns: TRUE if the pads could be connected.
*/
gboolean
gst_element_connect_pads_filtered (GstElement *src, const gchar *srcpadname,
GstElement *dest, const gchar *destpadname,
GstCaps *filtercaps)
{
GstPad *srcpad,*destpad;
g_return_val_if_fail (src != NULL, FALSE);
g_return_val_if_fail (GST_IS_ELEMENT (src), FALSE);
g_return_val_if_fail (srcpadname != NULL, FALSE);
g_return_val_if_fail (dest != NULL, FALSE);
g_return_val_if_fail (GST_IS_ELEMENT (dest), FALSE);
g_return_val_if_fail (destpadname != NULL, FALSE);
/* obtain the pads requested */
srcpad = gst_element_get_pad (src, srcpadname);
if (srcpad == NULL) {
GST_ERROR (src, "source element has no pad \"%s\"", srcpadname);
return FALSE;
}
destpad = gst_element_get_pad (dest, destpadname);
if (srcpad == NULL) {
GST_ERROR (dest, "destination element has no pad \"%s\"", destpadname);
return FALSE;
}
/* we're satisified they can be connected, let's do it */
return gst_pad_connect_filtered (srcpad, destpad, filtercaps);
}
/**
* gst_element_connect_pads:
* @src: element containing source pad
* @srcpadname: name of pad in source element
* @dest: element containing destination pad
* @destpadname: name of pad in destination element
*
* Connect the two named pads of the source and destination elements.
* Side effect is that if one of the pads has no parent, it becomes a
* child of the parent of the other element. If they have different
* parents, the connection fails.
*
* Returns: TRUE if the pads could be connected.
*/
gboolean
gst_element_connect_pads (GstElement *src, const gchar *srcpadname,
GstElement *dest, const gchar *destpadname)
{
return gst_element_connect_pads_filtered (src, srcpadname, dest, destpadname, NULL);
}
/**
* gst_element_disconnect_pads:
* @src: element containing source pad
* @srcpadname: name of pad in source element
* @dest: element containing destination pad
* @destpadname: name of pad in destination element
*
* Disconnect the two named pads of the source and destination elements.
*/
void
gst_element_disconnect_pads (GstElement *src, const gchar *srcpadname,
GstElement *dest, const gchar *destpadname)
{
GstPad *srcpad,*destpad;
g_return_if_fail (src != NULL);
g_return_if_fail (GST_IS_ELEMENT(src));
g_return_if_fail (srcpadname != NULL);
g_return_if_fail (dest != NULL);
g_return_if_fail (GST_IS_ELEMENT(dest));
g_return_if_fail (destpadname != NULL);
/* obtain the pads requested */
srcpad = gst_element_get_pad (src, srcpadname);
if (srcpad == NULL) {
GST_ERROR(src,"source element has no pad \"%s\"",srcpadname);
return;
}
destpad = gst_element_get_pad (dest, destpadname);
if (srcpad == NULL) {
GST_ERROR(dest,"destination element has no pad \"%s\"",destpadname);
return;
}
/* we're satisified they can be disconnected, let's do it */
gst_pad_disconnect(srcpad,destpad);
}
/**
* gst_element_disconnect_many:
* @element_1: the first element in the connection chain
* @element_2: the second element in the connection chain
* @...: NULL-terminated list of elements to disconnect in order
*
* Disconnect a series of elements. Uses #gst_element_disconnect.
*/
void
gst_element_disconnect_many (GstElement *element_1, GstElement *element_2, ...)
{
va_list args;
g_return_if_fail (element_1 != NULL && element_2 != NULL);
g_return_if_fail (GST_IS_ELEMENT (element_1) && GST_IS_ELEMENT (element_2));
va_start (args, element_2);
while (element_2) {
gst_element_disconnect (element_1, element_2);
element_1 = element_2;
element_2 = va_arg (args, GstElement*);
}
va_end (args);
}
/**
* gst_element_disconnect:
* @src: source element
* @dest: sink element
*
* Disconnect all pads connecting the two elements in the direction src -> dest.
*/
void
gst_element_disconnect (GstElement *src, GstElement *dest)
{
GList *srcpads;
GstPad *pad;
g_return_if_fail (GST_IS_ELEMENT(src));
g_return_if_fail (GST_IS_ELEMENT(dest));
srcpads = gst_element_get_pad_list (src);
while (srcpads) {
pad = GST_PAD (srcpads->data);
if (GST_PAD_DIRECTION (pad) == GST_PAD_SRC)
if (GST_OBJECT_PARENT (GST_PAD_PEER (pad)) == (GstObject*) dest)
gst_pad_disconnect (pad, GST_PAD_PEER (pad));
srcpads = g_list_next (srcpads);
}
}
static void
gst_element_error_func (GstElement* element, GstElement *source, gchar *errormsg)
{
/* tell the parent */
if (GST_OBJECT_PARENT (element)) {
GST_DEBUG (GST_CAT_EVENT, "forwarding error \"%s\" from %s to %s", errormsg,
GST_ELEMENT_NAME (element), GST_OBJECT_NAME (GST_OBJECT_PARENT (element)));
gst_object_ref (GST_OBJECT (element));
g_signal_emit (G_OBJECT (GST_OBJECT_PARENT (element)), gst_element_signals[ERROR], 0, source, errormsg);
gst_object_unref (GST_OBJECT (element));
}
}
/**
* gst_element_error:
* @element: Element with the error
* @error: A printf-like string describing the error
* @...: optional arguments for the string
*
* This function is used internally by elements to signal an error
* condition. It results in the "error" signal.
*/
void
gst_element_error (GstElement *element, const gchar *error, ...)
{
va_list var_args;
gchar *string;
/* checks */
g_return_if_fail (GST_IS_ELEMENT (element));
g_return_if_fail (element != NULL);
g_return_if_fail (error != NULL);
/* create error message */
va_start (var_args, error);
string = g_strdup_vprintf (error, var_args);
va_end (var_args);
GST_INFO (GST_CAT_EVENT, "ERROR in %s: %s", GST_ELEMENT_NAME (element), string);
/* emit the signal, make sure the element stays available */
gst_object_ref (GST_OBJECT (element));
g_signal_emit (G_OBJECT (element), gst_element_signals[ERROR], 0, element, string);
/* tell the scheduler */
if (element->sched) {
gst_scheduler_error (element->sched, element);
}
/* cleanup */
gst_object_unref (GST_OBJECT (element));
g_free (string);
}
/**
* gst_element_get_state:
* @element: a #GstElement to get state of
*
* Gets the state of the element.
*
* Returns: The #GstElementState of the element
*/
GstElementState
gst_element_get_state (GstElement *element)
{
g_return_val_if_fail (GST_IS_ELEMENT (element), GST_STATE_VOID_PENDING);
return GST_STATE (element);
}
/**
* gst_element_wait_state_change:
* @element: a #GstElement to wait for
*
* Waits and blocks until the element changed its state.
*/
void
gst_element_wait_state_change (GstElement *element)
{
g_mutex_lock (element->state_mutex);
g_cond_wait (element->state_cond, element->state_mutex);
g_mutex_unlock (element->state_mutex);
}
/**
* 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: whether or not the state was successfully set
* (using #GstElementStateReturn).
*/
gint
gst_element_set_state (GstElement *element, GstElementState state)
{
GstElementClass *oclass;
GstElementState curpending;
GstElementStateReturn return_val = GST_STATE_SUCCESS;
g_return_val_if_fail (GST_IS_ELEMENT (element), GST_STATE_FAILURE);
/* start with the current state */
curpending = GST_STATE(element);
GST_DEBUG_ELEMENT (GST_CAT_STATES, element, "setting state from %s to %s",
gst_element_state_get_name (curpending),
gst_element_state_get_name (state));
/* loop until the final requested state is set */
while (GST_STATE (element) != state
&& GST_STATE (element) != GST_STATE_VOID_PENDING) {
/* move the curpending state in the correct direction */
if (curpending < state)
curpending <<= 1;
else
curpending >>= 1;
/* set the pending state variable */
/* FIXME: should probably check to see that we don't already have one */
GST_STATE_PENDING (element) = curpending;
if (curpending != state) {
GST_DEBUG_ELEMENT (GST_CAT_STATES, element,
"intermediate: setting state from %s to %s",
gst_element_state_get_name (GST_STATE (element)),
gst_element_state_get_name (curpending));
}
/* call the state change function so it can set the state */
oclass = CLASS (element);
if (oclass->change_state)
return_val = (oclass->change_state) (element);
switch (return_val) {
case GST_STATE_FAILURE:
GST_DEBUG_ELEMENT (GST_CAT_STATES, element, "have failed change_state return");
goto exit;
case GST_STATE_ASYNC:
GST_DEBUG_ELEMENT (GST_CAT_STATES, element, "element will change state async");
goto exit;
case GST_STATE_SUCCESS:
/* Last thing we do is verify that a successful state change really
* did change the state... */
if (GST_STATE (element) != curpending) {
GST_DEBUG_ELEMENT (GST_CAT_STATES, element,
"element claimed state-change success, but state didn't change %s, %s <-> %s",
gst_element_state_get_name (GST_STATE (element)),
gst_element_state_get_name (GST_STATE_PENDING (element)),
gst_element_state_get_name (curpending));
return GST_STATE_FAILURE;
}
break;
default:
/* somebody added a GST_STATE_ and forgot to do stuff here ! */
g_assert_not_reached ();
}
}
exit:
return return_val;
}
static gboolean
gst_element_negotiate_pads (GstElement *element)
{
GList *pads = GST_ELEMENT_PADS (element);
GST_DEBUG_ELEMENT (GST_CAT_CAPS, element, "negotiating pads");
while (pads) {
GstPad *pad = GST_PAD (pads->data);
GstRealPad *srcpad;
pads = g_list_next (pads);
if (!GST_IS_REAL_PAD (pad))
continue;
srcpad = GST_PAD_REALIZE (pad);
/* if we have a connection on this pad and it doesn't have caps
* allready, try to negotiate */
if (GST_PAD_IS_CONNECTED (srcpad) && !GST_PAD_CAPS (srcpad)) {
GstRealPad *sinkpad;
GstElementState otherstate;
GstElement *parent;
sinkpad = GST_RPAD_PEER (GST_PAD_REALIZE (srcpad));
/* check the parent of the peer pad, if there is no parent do nothing */
parent = GST_PAD_PARENT (sinkpad);
if (!parent)
continue;
otherstate = GST_STATE (parent);
/* swap pads if needed */
if (!GST_PAD_IS_SRC (srcpad)) {
GstRealPad *temp;
temp = srcpad;
srcpad = sinkpad;
sinkpad = temp;
}
/* only try to negotiate if the peer element is in PAUSED or higher too */
if (otherstate >= GST_STATE_READY) {
GST_DEBUG_ELEMENT (GST_CAT_CAPS, element, "perform negotiate for %s:%s and %s:%s",
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
if (!gst_pad_perform_negotiate (GST_PAD (srcpad), GST_PAD (sinkpad)))
return FALSE;
}
else {
GST_DEBUG_ELEMENT (GST_CAT_CAPS, element, "not negotiatiating %s:%s and %s:%s, not in READY yet",
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
}
}
}
return TRUE;
}
static void
gst_element_clear_pad_caps (GstElement *element)
{
GList *pads = GST_ELEMENT_PADS (element);
GST_DEBUG_ELEMENT (GST_CAT_CAPS, element, "clearing pad caps");
while (pads) {
GstRealPad *pad = GST_PAD_REALIZE (pads->data);
if (GST_PAD_CAPS (pad)) {
GST_PAD_CAPS (pad) = NULL;
}
pads = g_list_next (pads);
}
}
static GstElementStateReturn
gst_element_change_state (GstElement *element)
{
GstElementState old_state;
GstObject *parent;
gint old_pending, old_transition;
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 (old_pending == GST_STATE_VOID_PENDING || old_state == GST_STATE_PENDING (element)) {
GST_INFO (GST_CAT_STATES, "no state change needed for element %s (VOID_PENDING)", GST_ELEMENT_NAME (element));
return GST_STATE_SUCCESS;
}
GST_INFO (GST_CAT_STATES, "%s default handler sets state from %s to %s %d", GST_ELEMENT_NAME (element),
gst_element_state_get_name (old_state),
gst_element_state_get_name (old_pending),
GST_STATE_TRANSITION (element));
/* we set the state change early for the negotiation functions */
GST_STATE (element) = old_pending;
GST_STATE_PENDING (element) = GST_STATE_VOID_PENDING;
/* if we are going to paused, we try to negotiate the pads */
if (old_transition == GST_STATE_NULL_TO_READY) {
if (!gst_element_negotiate_pads (element))
goto failure;
}
/* going to the READY state clears all pad caps */
else if (old_transition == GST_STATE_READY_TO_NULL) {
gst_element_clear_pad_caps (element);
}
/* tell the scheduler if we have one */
if (element->sched) {
if (gst_scheduler_state_transition (element->sched, element, old_transition)
!= GST_STATE_SUCCESS) {
goto failure;
}
}
parent = GST_ELEMENT_PARENT (element);
/* tell our parent about the state change */
if (parent && GST_IS_BIN (parent)) {
gst_bin_child_state_change (GST_BIN (parent), old_state, GST_STATE (element), element);
}
g_signal_emit (G_OBJECT (element), gst_element_signals[STATE_CHANGE],
0, old_state, GST_STATE (element));
/* signal the state change in case somebody is waiting for us */
g_mutex_lock (element->state_mutex);
g_cond_signal (element->state_cond);
g_mutex_unlock (element->state_mutex);
return GST_STATE_SUCCESS;
failure:
/* undo the state change */
GST_STATE (element) = old_state;
GST_STATE_PENDING (element) = old_pending;
return GST_STATE_FAILURE;
}
/**
* gst_element_get_factory:
* @element: element to request the factory
*
* Retrieves the factory that was used to create this element
*
* Returns: the factory used for creating this element
*/
GstElementFactory*
gst_element_get_factory (GstElement *element)
{
GstElementClass *oclass;
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
oclass = CLASS (element);
return oclass->elementfactory;
}
static void
gst_element_dispose (GObject *object)
{
GstElement *element = GST_ELEMENT (object);
GList *pads;
GstPad *pad;
GST_DEBUG_ELEMENT (GST_CAT_REFCOUNTING, element, "dispose");
gst_element_set_state (element, GST_STATE_NULL);
/* first we break all our connections with the ouside */
if (element->pads) {
GList *orig;
orig = pads = g_list_copy (element->pads);
while (pads) {
pad = GST_PAD (pads->data);
if (GST_PAD_PEER (pad)) {
GST_DEBUG (GST_CAT_REFCOUNTING, "disconnecting pad '%s'",
GST_OBJECT_NAME (GST_OBJECT (GST_PAD (GST_PAD_PEER (pad)))));
gst_pad_disconnect (pad, GST_PAD (GST_PAD_PEER (pad)));
}
gst_element_remove_pad (element, pad);
pads = g_list_next (pads);
}
g_list_free (orig);
g_list_free (element->pads);
element->pads = NULL;
}
element->numsrcpads = 0;
element->numsinkpads = 0;
element->numpads = 0;
g_mutex_free (element->state_mutex);
g_cond_free (element->state_cond);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
#ifndef GST_DISABLE_LOADSAVE
/**
* gst_element_save_thyself:
* @element: GstElement to save
* @parent: the xml parent node
*
* Saves the element as part of the given XML structure
*
* Returns: the new xml node
*/
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 = CLASS (element);
xmlNewChild(parent, NULL, "name", GST_ELEMENT_NAME(element));
if (oclass->elementfactory != NULL) {
GstElementFactory *factory = (GstElementFactory *)oclass->elementfactory;
xmlNewChild (parent, NULL, "type", GST_OBJECT_NAME (factory));
xmlNewChild (parent, NULL, "version", factory->details->version);
}
/* 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;
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))
xmlNewChild (param, NULL, "value", g_value_dup_string (&value));
else if (G_IS_PARAM_SPEC_ENUM (spec))
xmlNewChild (param, NULL, "value", g_strdup_printf ("%d", g_value_get_enum (&value)));
else if (G_IS_PARAM_SPEC_INT64 (spec))
xmlNewChild (param, NULL, "value", g_strdup_printf ("%lld", g_value_get_int64 (&value)));
else
xmlNewChild (param, NULL, "value", g_strdup_value_contents (&value));
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;
guchar *name = NULL;
guchar *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 ((GObject *)G_OBJECT (element), name, value);
}
children = children->next;
}
/* pads */
children = self->xmlChildrenNode;
while (children) {
if (!strcmp (children->name, "pad")) {
gst_pad_load_and_connect (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 */
/**
* gst_element_yield:
* @element: Element to yield
*
* Request a yield operation for the child. The scheduler will typically
* give control to another element.
*/
void
gst_element_yield (GstElement *element)
{
if (GST_ELEMENT_SCHED (element)) {
gst_scheduler_yield (GST_ELEMENT_SCHED (element), element);
}
}
/**
* gst_element_interrupt:
* @element: Element to interrupt
*
* Request the scheduler of this element to interrupt the execution of
* this element and scheduler another one.
*
* Returns: a boolean indicating that the child should exit its chain/loop/get
* function ASAP, depending on the scheduler implementation.
*/
gboolean
gst_element_interrupt (GstElement *element)
{
if (GST_ELEMENT_SCHED (element)) {
return gst_scheduler_interrupt (GST_ELEMENT_SCHED (element), element);
}
else
return FALSE;
}
/**
* gst_element_set_sched:
* @element: Element to set manager of.
* @sched: @GstScheduler to set.
*
* Sets the scheduler of the element. For internal use only, unless you're
* writing a new bin subclass.
*/
void
gst_element_set_sched (GstElement *element,
GstScheduler *sched)
{
g_return_if_fail (GST_IS_ELEMENT (element));
GST_INFO_ELEMENT (GST_CAT_PARENTAGE, element, "setting scheduler to %p", sched);
element->sched = sched;
}
/**
* gst_element_get_sched:
* @element: Element to get manager of.
*
* Returns the scheduler of the element.
*
* Returns: Element's scheduler
*/
GstScheduler*
gst_element_get_sched (GstElement *element)
{
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
return element->sched;
}
/**
* gst_element_set_loop_function:
* @element: Element to set loop function of.
* @loop: Pointer to loop function.
*
* This sets the loop function for the element. The function pointed to
* can deviate from the GstElementLoopFunction definition in type of
* pointer only.
*
* NOTE: in order for this to take effect, the current loop function *must*
* exit. Assuming the loop function itself is the only one who will cause
* a new loopfunc to be assigned, this should be no problem.
*/
void
gst_element_set_loop_function (GstElement *element,
GstElementLoopFunction loop)
{
g_return_if_fail (GST_IS_ELEMENT (element));
/* set the loop function */
element->loopfunc = loop;
/* set the NEW_LOOPFUNC flag so everyone knows to go try again */
GST_FLAG_SET (element, GST_ELEMENT_NEW_LOOPFUNC);
}
/**
* gst_element_set_eos:
* @element: element to set to the EOS state
*
* Perform the actions needed to bring the element in the EOS state.
*/
void
gst_element_set_eos (GstElement *element)
{
g_return_if_fail (GST_IS_ELEMENT (element));
GST_DEBUG (GST_CAT_EVENT, "setting EOS on element %s", GST_OBJECT_NAME (element));
gst_element_set_state (element, GST_STATE_PAUSED);
g_signal_emit (G_OBJECT (element), gst_element_signals[EOS], 0);
}
/**
* gst_element_state_get_name:
* @state: a #GstElementState to get the name of
*
* Gets a string representing the given state.
*
* Returns: a string with the statename.
*/
const gchar*
gst_element_state_get_name (GstElementState state)
{
switch (state) {
#ifdef GST_DEBUG_COLOR
case GST_STATE_VOID_PENDING: return "NONE_PENDING";break;
case GST_STATE_NULL: return "\033[01;37mNULL\033[00m";break;
case GST_STATE_READY: return "\033[01;31mREADY\033[00m";break;
case GST_STATE_PLAYING: return "\033[01;32mPLAYING\033[00m";break;
case GST_STATE_PAUSED: return "\033[01;33mPAUSED\033[00m";break;
default: return g_strdup_printf ("\033[01;37;41mUNKNOWN!\033[00m(%d)", state);
#else
case GST_STATE_VOID_PENDING: return "NONE_PENDING";break;
case GST_STATE_NULL: return "NULL";break;
case GST_STATE_READY: return "READY";break;
case GST_STATE_PLAYING: return "PLAYING";break;
case GST_STATE_PAUSED: return "PAUSED";break;
default: return "UNKNOWN!";
#endif
}
return "";
}
static void
gst_element_populate_std_props (GObjectClass * klass,
const char *prop_name, guint arg_id, GParamFlags flags)
{
GQuark prop_id = g_quark_from_string (prop_name);
GParamSpec *pspec;
static GQuark fd_id = 0;
static GQuark blocksize_id;
static GQuark bytesperread_id;
static GQuark dump_id;
static GQuark filesize_id;
static GQuark mmapsize_id;
static GQuark location_id;
static GQuark offset_id;
static GQuark silent_id;
static GQuark touch_id;
if (!fd_id) {
fd_id = g_quark_from_static_string ("fd");
blocksize_id = g_quark_from_static_string ("blocksize");
bytesperread_id = g_quark_from_static_string ("bytesperread");
dump_id = g_quark_from_static_string ("dump");
filesize_id = g_quark_from_static_string ("filesize");
mmapsize_id = g_quark_from_static_string ("mmapsize");
location_id = g_quark_from_static_string ("location");
offset_id = g_quark_from_static_string ("offset");
silent_id = g_quark_from_static_string ("silent");
touch_id = g_quark_from_static_string ("touch");
}
if (prop_id == fd_id) {
pspec = g_param_spec_int ("fd", "File-descriptor",
"File-descriptor for the file being read",
0, G_MAXINT, 0, flags);
}
else if (prop_id == blocksize_id) {
pspec = g_param_spec_ulong ("blocksize", "Block Size",
"Block size to read per buffer",
0, G_MAXULONG, 4096, flags);
}
else if (prop_id == bytesperread_id) {
pspec = g_param_spec_int ("bytesperread", "Bytes per read",
"Number of bytes to read per buffer",
G_MININT, G_MAXINT, 0, flags);
}
else if (prop_id == dump_id) {
pspec = g_param_spec_boolean ("dump", "Dump", "Dump bytes to stdout", FALSE, flags);
}
else if (prop_id == filesize_id) {
pspec = g_param_spec_int64 ("filesize", "File Size",
"Size of the file being read",
0, G_MAXINT64, 0, flags);
}
else if (prop_id == mmapsize_id) {
pspec = g_param_spec_ulong ("mmapsize", "mmap() Block Size",
"Size in bytes of mmap()d regions",
0, G_MAXULONG, 4 * 1048576, flags);
}
else if (prop_id == location_id) {
pspec = g_param_spec_string ("location", "File Location",
"Location of the file to read",
NULL, flags);
}
else if (prop_id == offset_id) {
pspec = g_param_spec_int64 ("offset", "File Offset",
"Byte offset of current read pointer",
0, G_MAXINT64, 0, flags);
}
else if (prop_id == silent_id) {
pspec = g_param_spec_boolean ("silent", "Silent", "Don't produce events",
FALSE, flags);
}
else if (prop_id == touch_id) {
pspec = g_param_spec_boolean ("touch", "Touch read data",
"Touch data to force disk read before "
"push ()", TRUE, flags);
}
else {
g_warning ("Unknown - 'standard' property '%s' id %d from klass %s",
prop_name, arg_id, g_type_name (G_OBJECT_CLASS_TYPE (klass)));
pspec = NULL;
}
if (pspec) {
g_object_class_install_property (klass, arg_id, pspec);
}
}
/**
* gst_element_class_install_std_props:
* @klass: the class to add the properties to
* @first_name: the first in a NULL terminated
* 'name', 'id', 'flags' triplet list.
* @...: the triplet list
*
* Add a list of standardized properties with types to the @klass.
* the id is for the property switch in your get_prop method, and
* the flags determine readability / writeability.
**/
void
gst_element_class_install_std_props (GstElementClass * klass, const char *first_name, ...)
{
const char *name;
va_list args;
g_return_if_fail (GST_IS_ELEMENT_CLASS (klass));
va_start (args, first_name);
name = first_name;
while (name) {
int arg_id = va_arg (args, int);
int flags = va_arg (args, int);
gst_element_populate_std_props ((GObjectClass *) klass, name, arg_id, flags);
name = va_arg (args, char *);
}
va_end (args);
}
/**
* gst_element_get_managing_bin:
* @element: a #GstElement
*
* Gets the managing bin (a pipeline or a thread, for example) of an element.
*
* Returns: the #GstBin, or NULL on failure
**/
GstBin*
gst_element_get_managing_bin (GstElement *element)
{
GstBin *bin;
g_return_val_if_fail (element != NULL, NULL);
bin = GST_BIN (gst_object_get_parent (GST_OBJECT_CAST (element)));
while (bin && !GST_FLAG_IS_SET (GST_OBJECT_CAST (bin), GST_BIN_FLAG_MANAGER))
bin = GST_BIN (gst_object_get_parent (GST_OBJECT_CAST (bin)));
return bin;
}
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