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gstreamer/gst/gstelement.c
Wim Taymans 5c73a7824c Changed a stupid assert in request_pad. 
Original commit message from CVS:
Changed a stupid assert in request_pad.
Some fixes for pullregion and EOS conditions.
Remove an unneeded check in the scheduler (check for NULL buffer)
some EOS fixes for pullregion in disksrc.
Removed the macro in the gstparse.h header 'cause it's internal to gstparse.c
Added a check in gstparse for NULL element.
2001-06-15 19:13:45 +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 "gst_private.h"
#include "gstelement.h"
#include "gstextratypes.h"
#include "gstbin.h"
#include "gstscheduler.h"
#include "gstutils.h"
/* Element signals and args */
enum {
STATE_CHANGE,
NEW_PAD,
PAD_REMOVED,
NEW_GHOST_PAD,
GHOST_PAD_REMOVED,
ERROR,
EOS,
LAST_SIGNAL
};
enum {
ARG_0,
/* FILL ME */
};
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_arg (GtkObject *object, GtkArg *arg, guint id);
static void gst_element_get_arg (GtkObject *object, GtkArg *arg, guint id);
static void gst_element_shutdown (GtkObject *object);
static void gst_element_real_destroy (GtkObject *object);
static GstElementStateReturn gst_element_change_state (GstElement *element);
GstElement* gst_element_restore_thyself (xmlNodePtr self, GstObject *parent);
static xmlNodePtr gst_element_save_thyself (GstObject *object, xmlNodePtr parent);
static GstObjectClass *parent_class = NULL;
static guint gst_element_signals[LAST_SIGNAL] = { 0 };
GtkType gst_element_get_type(void) {
static GtkType element_type = 0;
if (!element_type) {
static const GtkTypeInfo element_info = {
"GstElement",
sizeof(GstElement),
sizeof(GstElementClass),
(GtkClassInitFunc)gst_element_class_init,
(GtkObjectInitFunc)gst_element_init,
(GtkArgSetFunc)gst_element_set_arg,
(GtkArgGetFunc)gst_element_get_arg,
(GtkClassInitFunc)gst_element_base_class_init,
};
element_type = gtk_type_unique(GST_TYPE_OBJECT,&element_info);
}
return element_type;
}
static void
gst_element_class_init (GstElementClass *klass)
{
GtkObjectClass *gtkobject_class;
GstObjectClass *gstobject_class;
gtkobject_class = (GtkObjectClass*) klass;
gstobject_class = (GstObjectClass*) klass;
parent_class = gtk_type_class(GST_TYPE_OBJECT);
gst_element_signals[STATE_CHANGE] =
gtk_signal_new ("state_change", GTK_RUN_LAST, gtkobject_class->type,
GTK_SIGNAL_OFFSET (GstElementClass, state_change),
gtk_marshal_NONE__INT, GTK_TYPE_NONE, 1,
GTK_TYPE_INT);
gst_element_signals[NEW_PAD] =
gtk_signal_new ("new_pad", GTK_RUN_LAST, gtkobject_class->type,
GTK_SIGNAL_OFFSET (GstElementClass, new_pad),
gtk_marshal_NONE__POINTER, GTK_TYPE_NONE, 1,
GST_TYPE_PAD);
gst_element_signals[PAD_REMOVED] =
gtk_signal_new ("pad_removed", GTK_RUN_LAST, gtkobject_class->type,
GTK_SIGNAL_OFFSET (GstElementClass, pad_removed),
gtk_marshal_NONE__POINTER, GTK_TYPE_NONE, 1,
GST_TYPE_PAD);
gst_element_signals[NEW_GHOST_PAD] =
gtk_signal_new ("new_ghost_pad", GTK_RUN_LAST, gtkobject_class->type,
GTK_SIGNAL_OFFSET (GstElementClass, new_ghost_pad),
gtk_marshal_NONE__POINTER, GTK_TYPE_NONE, 1,
GST_TYPE_PAD);
gst_element_signals[GHOST_PAD_REMOVED] =
gtk_signal_new ("ghost_pad_removed", GTK_RUN_LAST, gtkobject_class->type,
GTK_SIGNAL_OFFSET (GstElementClass, ghost_pad_removed),
gtk_marshal_NONE__POINTER, GTK_TYPE_NONE, 1,
GST_TYPE_PAD);
gst_element_signals[ERROR] =
gtk_signal_new ("error", GTK_RUN_LAST, gtkobject_class->type,
GTK_SIGNAL_OFFSET (GstElementClass, error),
gtk_marshal_NONE__STRING, GTK_TYPE_NONE,1,
GTK_TYPE_STRING);
gst_element_signals[EOS] =
gtk_signal_new ("eos", GTK_RUN_LAST, gtkobject_class->type,
GTK_SIGNAL_OFFSET (GstElementClass,eos),
gtk_marshal_NONE__NONE, GTK_TYPE_NONE, 0);
gtk_object_class_add_signals (gtkobject_class, gst_element_signals, LAST_SIGNAL);
gtkobject_class->set_arg = GST_DEBUG_FUNCPTR(gst_element_set_arg);
gtkobject_class->get_arg = GST_DEBUG_FUNCPTR(gst_element_get_arg);
gtkobject_class->shutdown = GST_DEBUG_FUNCPTR(gst_element_shutdown);
gtkobject_class->destroy = GST_DEBUG_FUNCPTR(gst_element_real_destroy);
gstobject_class->save_thyself = GST_DEBUG_FUNCPTR(gst_element_save_thyself);
gstobject_class->restore_thyself = GST_DEBUG_FUNCPTR(gst_element_restore_thyself);
klass->change_state = GST_DEBUG_FUNCPTR(gst_element_change_state);
klass->elementfactory = NULL;
}
static void
gst_element_base_class_init (GstElementClass *klass)
{
GtkObjectClass *gtkobject_class;
gtkobject_class = (GtkObjectClass*) klass;
gtkobject_class->set_arg = GST_DEBUG_FUNCPTR(gst_element_set_arg);
gtkobject_class->get_arg = GST_DEBUG_FUNCPTR(gst_element_get_arg);
}
static void
gst_element_init (GstElement *element)
{
element->current_state = GST_STATE_NULL;
element->pending_state = -1;
element->numpads = 0;
element->numsrcpads = 0;
element->numsinkpads = 0;
element->pads = NULL;
element->loopfunc = NULL;
element->threadstate = NULL;
element->sched = NULL;
}
static void
gst_element_set_arg (GtkObject *object, GtkArg *arg, guint id)
{
GstElementClass *oclass = GST_ELEMENT_CLASS (object->klass);
GST_SCHEDULE_LOCK_ELEMENT ( GST_ELEMENT_SCHED(object), GST_ELEMENT(object) );
if (oclass->set_arg)
(oclass->set_arg)(object,arg,id);
GST_SCHEDULE_UNLOCK_ELEMENT ( GST_ELEMENT_SCHED(object), GST_ELEMENT(object) );
}
static void
gst_element_get_arg (GtkObject *object, GtkArg *arg, guint id)
{
GstElementClass *oclass = GST_ELEMENT_CLASS (object->klass);
GST_SCHEDULE_LOCK_ELEMENT (GST_ELEMENT_SCHED(object), GST_ELEMENT(object) );
if (oclass->get_arg)
(oclass->get_arg)(object,arg,id);
GST_SCHEDULE_UNLOCK_ELEMENT (GST_ELEMENT_SCHED(object), GST_ELEMENT(object) );
}
/**
* gst_element_new:
*
* Create a new element. Should never be used, as it does no good.
*
* Returns: new element
*/
GstElement*
gst_element_new(void)
{
return GST_ELEMENT (gtk_type_new (GST_TYPE_ELEMENT));
}
/**
* gst_element_set_name:
* @element: GstElement to set name of
* @name: new name of element
*
* Set 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));
g_return_if_fail (name != NULL);
gst_object_set_name (GST_OBJECT (element), name);
}
/**
* gst_element_get_name:
* @element: GstElement to get name of
*
* Get 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: GstElement to set parent of
* @parent: new parent of the object
*
* Set 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 (GTK_IS_OBJECT (parent));
g_return_if_fail ((gpointer)element != (gpointer)parent);
gst_object_set_parent (GST_OBJECT (element), parent);
}
/**
* gst_element_get_parent:
* @element: GstElement to get the parent of
*
* Get the parent of the element.
*
* Returns: 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_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'\n",
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 */
gtk_signal_emit (GTK_OBJECT (element), gst_element_signals[NEW_PAD], 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);
/* add it to 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--;
gtk_signal_emit (GTK_OBJECT (element), gst_element_signals[PAD_REMOVED], 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.
*/
void
gst_element_add_ghost_pad (GstElement *element, GstPad *pad, gchar *name)
{
GstPad *ghostpad;
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));
// then check to see if there's already a pad by that name here
g_return_if_fail (gst_object_check_uniqueness (element->pads, name) == TRUE);
GST_DEBUG(GST_CAT_ELEMENT_PADS,"creating new ghost pad called %s, from pad %s:%s\n",
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\n",
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\n",GST_DEBUG_PAD_NAME(ghostpad));
/* emit the NEW_GHOST_PAD signal */
gtk_signal_emit (GTK_OBJECT (element), gst_element_signals[NEW_GHOST_PAD], 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_PAD (pad));
// FIXME this is redundant?
}
/**
* 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)
{
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);
// if there aren't any pads, well, we're not likely to find one
if (!element->numpads)
return NULL;
// look through the list, matching by name
walk = element->pads;
while (walk) {
GstPad *pad = GST_PAD(walk->data);
if (!strcmp (GST_PAD_NAME(pad), name)) {
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_ELEMENT_NAME(element));
return NULL;
}
/**
* 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_get_padtemplate_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_padtemplate_list (GstElement *element)
{
GstElementClass *oclass;
g_return_val_if_fail (element != NULL, NULL);
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
oclass = GST_ELEMENT_CLASS (GTK_OBJECT (element)->klass);
if (oclass->elementfactory == NULL) return NULL;
/* return the list of pads */
return oclass->elementfactory->padtemplates;
}
/**
* gst_element_get_padtemplate_by_name:
* @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
*/
GstPadTemplate*
gst_element_get_padtemplate_by_name (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_padtemplate_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_padtemplate_by_compatible:
* @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
*/
static GstPadTemplate*
gst_element_get_padtemplate_by_compatible (GstElement *element, GstPadTemplate *compattempl)
{
GstPadTemplate *newtempl = NULL;
GList *padlist;
GST_DEBUG(GST_CAT_ELEMENT_PADS,"gst_element_get_padtemplate_by_compatible()\n");
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_padtemplate_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\n");
if (padtempl->direction == GST_PAD_SRC &&
compattempl->direction == GST_PAD_SINK) {
GST_DEBUG(GST_CAT_CAPS,"compatible direction: found src pad template\n");
compat = gst_caps_check_compatibility(GST_PADTEMPLATE_CAPS (padtempl),
GST_PADTEMPLATE_CAPS (compattempl));
GST_DEBUG(GST_CAT_CAPS,"caps are %scompatible\n", (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\n");
compat = gst_caps_check_compatibility(GST_PADTEMPLATE_CAPS (compattempl),
GST_PADTEMPLATE_CAPS (padtempl));
GST_DEBUG(GST_CAT_CAPS,"caps are %scompatible\n", (compat?"":"not "));
}
if (compat) {
newtempl = padtempl;
break;
}
padlist = g_list_next (padlist);
}
return newtempl;
}
static GstPad*
gst_element_request_pad (GstElement *element, GstPadTemplate *templ)
{
GstPad *newpad = NULL;
GstElementClass *oclass;
oclass = GST_ELEMENT_CLASS (GTK_OBJECT (element)->klass);
if (oclass->request_new_pad)
newpad = (oclass->request_new_pad)(element, templ);
return newpad;
}
/**
* 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_padtemplate_by_compatible (element, templ);
if (templ_new != NULL)
pad = gst_element_request_pad (element, templ_new);
return pad;
}
/**
* gst_element_request_pad_by_name:
* @element: element to request a new pad from
* @name: the name of the padtemplate to use.
*
* Request a new pad from the element. The name argument will
* be used to decide what padtemplate to use. 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_pad_by_name (GstElement *element, const gchar *name)
{
GstPadTemplate *templ;
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);
templ = gst_element_get_padtemplate_by_name (element, name);
if (templ == NULL)
return NULL;
pad = gst_element_request_pad (element, templ);
return pad;
}
/**
* gst_element_connect:
* @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.
*/
void
gst_element_connect (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 connected, let's do it */
gst_pad_connect(srcpad,destpad);
}
/**
* gst_element_disconnect:
* @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 (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_error:
* @element: Element with the error
* @error: String describing the error
*
* 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)
{
g_error("GstElement: error in element '%s': %s\n", GST_ELEMENT_NAME(element), error);
/* FIXME: this is not finished!!! */
gtk_signal_emit (GTK_OBJECT (element), gst_element_signals[ERROR], error);
}
/**
* gst_element_set_state:
* @element: element to change state of
* @state: new element state
*
* Sets the state of the element. This function will only set
* the elements pending state.
*
* Returns: whether or not the state was successfully set.
*/
gint
gst_element_set_state (GstElement *element, GstElementState state)
{
GstElementClass *oclass;
GstElementState curpending;
GstElementStateReturn return_val = GST_STATE_SUCCESS;
// g_print("gst_element_set_state(\"%s\",%08lx)\n",
// element->name,state);
g_return_val_if_fail (element != NULL, GST_STATE_FAILURE);
g_return_val_if_fail (GST_IS_ELEMENT (element), GST_STATE_FAILURE);
g_return_val_if_fail (element->sched != NULL, GST_STATE_FAILURE);
GST_DEBUG_ELEMENT (GST_CAT_STATES,element, "setting state from %s to %s\n",
gst_element_statename(GST_STATE(element)),
gst_element_statename(state));
/* start with the current state */
curpending = GST_STATE(element);
/* loop until the final requested state is set */
while (GST_STATE(element) != state) {
/* 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 to %s\n",
gst_element_statename(curpending));
/* call the state change function so it can set the state */
oclass = GST_ELEMENT_CLASS (GTK_OBJECT (element)->klass);
if (oclass->change_state)
return_val = (oclass->change_state)(element);
/* if that outright didn't work, we need to bail right away */
/* NOTE: this will bail on ASYNC as well! */
if (return_val == GST_STATE_FAILURE) {
GST_DEBUG_ELEMENT (GST_CAT_STATES,element,"have failed change_state return\n");
return return_val;
}
}
/* this is redundant, really, it will always return SUCCESS */
return return_val;
}
/**
* 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 (element != NULL, NULL);
g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
oclass = GST_ELEMENT_CLASS (GTK_OBJECT (element)->klass);
return oclass->elementfactory;
}
/**
* gst_element_change_state:
* @element: element to change state of
*
* Changes the state of the element, but more importantly fires off a signal
* indicating the new state.
* The element will have no pending states anymore.
*
* Returns: whether or not the state change was successfully set.
*/
GstElementStateReturn
gst_element_change_state (GstElement *element)
{
g_return_val_if_fail (element != NULL, GST_STATE_FAILURE);
g_return_val_if_fail (GST_IS_ELEMENT (element), GST_STATE_FAILURE);
// GST_DEBUG_ELEMENT (GST_CAT_STATES, element, "default handler sets state to %s\n",
// gst_element_statename(GST_STATE_PENDING(element)));
if (GST_STATE_TRANSITION(element) == GST_STATE_PAUSED_TO_PLAYING) {
g_return_val_if_fail(GST_ELEMENT_SCHED(element), GST_STATE_FAILURE);
if (GST_ELEMENT_PARENT(element))
GST_DEBUG(GST_CAT_STATES,"PAUSED->PLAYING: element \"%s\" has parent \"%s\" and sched %p\n",
GST_ELEMENT_NAME(element),GST_ELEMENT_NAME(GST_ELEMENT_PARENT(element)),GST_ELEMENT_SCHED(element));
GST_SCHEDULE_ENABLE_ELEMENT (element->sched,element);
}
else if (GST_STATE_TRANSITION(element) == GST_STATE_PLAYING_TO_PAUSED) {
if (GST_ELEMENT_PARENT(element))
GST_DEBUG(GST_CAT_STATES,"PLAYING->PAUSED: element \"%s\" has parent \"%s\" and sched %p\n",
GST_ELEMENT_NAME(element),GST_ELEMENT_NAME(GST_ELEMENT_PARENT(element)),GST_ELEMENT_SCHED(element));
GST_SCHEDULE_DISABLE_ELEMENT (element->sched,element);
}
GST_STATE (element) = GST_STATE_PENDING (element);
GST_STATE_PENDING (element) = GST_STATE_NONE_PENDING;
// note: queues' state_change is a special case because it needs to lock
// for synchronization (from another thread). since this signal may block
// or (worse) make another state change, the queue needs to unlock before
// calling. thus, gstqueue.c::gst_queue_state_change() blocks, unblocks,
// unlocks, then emits this.
gtk_signal_emit (GTK_OBJECT (element), gst_element_signals[STATE_CHANGE],
GST_STATE (element));
return GST_STATE_SUCCESS;
}
static void
gst_element_shutdown (GtkObject *object)
{
GstElement *element = GST_ELEMENT (object);
GST_DEBUG_ELEMENT (GST_CAT_REFCOUNTING, element, "shutdown\n");
if (GST_IS_BIN (GST_OBJECT_PARENT (element)))
gst_bin_remove (GST_BIN (GST_OBJECT_PARENT (element)), element);
if (GTK_OBJECT_CLASS (parent_class)->shutdown)
GTK_OBJECT_CLASS (parent_class)->shutdown (object);
}
static void
gst_element_real_destroy (GtkObject *object)
{
GstElement *element = GST_ELEMENT (object);
GList *pads;
GstPad *pad;
GST_DEBUG_ELEMENT (GST_CAT_REFCOUNTING, element, "destroy\n");
if (element->pads) {
GList *orig;
orig = pads = g_list_copy (element->pads);
while (pads) {
pad = GST_PAD (pads->data);
//gst_object_destroy (GST_OBJECT (pad));
gst_object_ref (GST_OBJECT (pad));
gst_element_remove_pad (element, pad);
gst_object_unref (GST_OBJECT (pad));
pads = g_list_next (pads);
}
g_list_free (orig);
g_list_free (element->pads);
element->pads = NULL;
}
element->numsrcpads = 0;
element->numsinkpads = 0;
if (GTK_OBJECT_CLASS (parent_class)->destroy)
GTK_OBJECT_CLASS (parent_class)->destroy (object);
}
/*
static gchar *_gst_element_type_names[] = {
"invalid",
"none",
"char",
"uchar",
"bool",
"int",
"uint",
"long",
"ulong",
"float",
"double",
"string",
};
*/
/**
* 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;
GtkType type;
GstElement *element;
g_return_val_if_fail (object != NULL, parent);
g_return_val_if_fail (GST_IS_ELEMENT (object), parent);
g_return_val_if_fail (parent != NULL, parent);
element = GST_ELEMENT (object);
oclass = GST_ELEMENT_CLASS (GTK_OBJECT (element)->klass);
xmlNewChild(parent, NULL, "name", GST_ELEMENT_NAME(element));
if (oclass->elementfactory != NULL) {
GstElementFactory *factory = (GstElementFactory *)oclass->elementfactory;
xmlNewChild (parent, NULL, "type", factory->name);
xmlNewChild (parent, NULL, "version", factory->details->version);
}
// if (element->manager)
// xmlNewChild(parent, NULL, "manager", GST_ELEMENT_NAME(element->manager));
// output all args to the element
type = GTK_OBJECT_TYPE (element);
while (type != GTK_TYPE_INVALID) {
GtkArg *args;
guint32 *flags;
guint num_args,i;
args = gtk_object_query_args (type, &flags, &num_args);
for (i=0; i<num_args; i++) {
if ((args[i].type > GTK_TYPE_NONE) &&
(flags[i] & GTK_ARG_READABLE)) {
xmlNodePtr arg;
gtk_object_getv (GTK_OBJECT (element), 1, &args[i]);
arg = xmlNewChild (parent, NULL, "arg", NULL);
xmlNewChild (arg, NULL, "name", args[i].name);
switch (args[i].type) {
case GTK_TYPE_CHAR:
xmlNewChild (arg, NULL, "value",
g_strdup_printf ("%c", GTK_VALUE_CHAR (args[i])));
break;
case GTK_TYPE_UCHAR:
xmlNewChild (arg, NULL, "value",
g_strdup_printf ("%d", GTK_VALUE_UCHAR (args[i])));
break;
case GTK_TYPE_BOOL:
xmlNewChild (arg, NULL, "value",
GTK_VALUE_BOOL (args[i]) ? "true" : "false");
break;
case GTK_TYPE_INT:
xmlNewChild (arg, NULL, "value",
g_strdup_printf ("%d", GTK_VALUE_INT (args[i])));
break;
case GTK_TYPE_LONG:
xmlNewChild (arg, NULL, "value",
g_strdup_printf ("%ld", GTK_VALUE_LONG (args[i])));
break;
case GTK_TYPE_ULONG:
xmlNewChild (arg, NULL, "value",
g_strdup_printf ("%lu", GTK_VALUE_ULONG (args[i])));
break;
case GTK_TYPE_FLOAT:
xmlNewChild (arg, NULL, "value",
g_strdup_printf ("%f", GTK_VALUE_FLOAT (args[i])));
break;
case GTK_TYPE_DOUBLE:
xmlNewChild (arg, NULL, "value",
g_strdup_printf ("%g", GTK_VALUE_DOUBLE (args[i])));
break;
case GTK_TYPE_STRING:
xmlNewChild (arg, NULL, "value", GTK_VALUE_STRING (args[i]));
break;
default:
if (args[i].type == GST_TYPE_FILENAME) {
xmlNewChild (arg, NULL, "value", GTK_VALUE_STRING (args[i]));
}
break;
}
}
}
type = gtk_type_parent (type);
}
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;
}
/**
* gst_element_restore_thyself:
* @self: the xml node
* @parent: the parent of this object when it's loaded
*
* Load the element from the XML description
*
* Returns: the new element
*/
GstElement*
gst_element_restore_thyself (xmlNodePtr self, GstObject *parent)
{
xmlNodePtr children = self->xmlChildrenNode;
GstElement *element;
GstObjectClass *oclass;
guchar *name = NULL;
guchar *value = NULL;
guchar *type = NULL;
// first get the needed tags to construct the element
while (children) {
if (!strcmp (children->name, "name")) {
name = g_strdup (xmlNodeGetContent (children));
} else if (!strcmp (children->name, "type")) {
type = g_strdup (xmlNodeGetContent (children));
}
children = children->next;
}
g_return_val_if_fail (name != NULL, NULL);
g_return_val_if_fail (type != NULL, NULL);
GST_INFO (GST_CAT_XML,"loading \"%s\" of type \"%s\"", name, type);
element = gst_elementfactory_make (type, name);
g_return_val_if_fail (element != NULL, NULL);
// ne need to set the parent on this object bacause the pads
// will go through the hierarchy to connect to thier peers
if (parent)
gst_object_set_parent (GST_OBJECT (element), parent);
// we have the element now, set the arguments
children = self->xmlChildrenNode;
while (children) {
if (!strcmp (children->name, "arg")) {
xmlNodePtr child = children->xmlChildrenNode;
while (child) {
if (!strcmp (child->name, "name")) {
name = g_strdup (xmlNodeGetContent (child));
}
else if (!strcmp (child->name, "value")) {
value = g_strdup (xmlNodeGetContent (child));
}
child = child->next;
}
gst_util_set_object_arg (GTK_OBJECT (element), name, value);
}
children = children->next;
}
// we have the element now, set the pads
children = self->xmlChildrenNode;
while (children) {
if (!strcmp (children->name, "pad")) {
gst_pad_load_and_connect (children, GST_OBJECT (element));
}
children = children->next;
}
oclass = GST_OBJECT_CLASS (GTK_OBJECT (element)->klass);
if (oclass->restore_thyself)
(oclass->restore_thyself) (GST_OBJECT (element), self);
if (parent)
gst_object_unparent (GST_OBJECT (element));
gst_class_signal_emit_by_name (GST_OBJECT (element), "object_loaded", self);
return element;
}
/**
* gst_element_set_sched:
* @element: Element to set manager of.
* @sched: @GstSchedule 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,
GstSchedule *sched)
{
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
*/
GstSchedule*
gst_element_get_sched (GstElement *element)
{
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)
{
/* 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_signal_eos:
* @element: element to trigger the eos signal of
*
* Throws the eos signal to indicate that the end of the stream is reached.
*/
void
gst_element_signal_eos (GstElement *element)
{
g_return_if_fail (element != NULL);
g_return_if_fail (GST_IS_ELEMENT (element));
gtk_signal_emit (GTK_OBJECT (element), gst_element_signals[EOS]);
GST_FLAG_SET(element,GST_ELEMENT_COTHREAD_STOPPING);
}
const gchar *gst_element_statename(int state) {
switch (state) {
#ifdef GST_DEBUG_COLOR
case GST_STATE_NONE_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 "\033[01;37;41mUNKNOWN!\033[00m";
#else
case GST_STATE_NONE_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 "";
}
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