gstreamer/gst/gstbin.c
Erik Walthinsen d574ab8126 merge from EVENTS1 on 20011016
Original commit message from CVS:
merge from EVENTS1 on 20011016
2001-10-17 10:21:27 +00:00

711 lines
19 KiB
C

/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstbin.c: GstBin container object and support code
*
* 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 "gstbin.h"
#include "gstscheduler.h"
GstElementDetails gst_bin_details = {
"Generic bin",
"Bin",
"Simple container object",
VERSION,
"Erik Walthinsen <omega@cse.ogi.edu>",
"(C) 1999",
};
static void gst_bin_dispose (GObject *object);
static GstElementStateReturn gst_bin_change_state (GstElement *element);
static GstElementStateReturn gst_bin_change_state_norecurse (GstBin *bin);
static gboolean gst_bin_change_state_type (GstBin *bin,
GstElementState state,
GType type);
static gboolean gst_bin_iterate_func (GstBin *bin);
#ifndef GST_DISABLE_LOADSAVE
static xmlNodePtr gst_bin_save_thyself (GstObject *object, xmlNodePtr parent);
static void gst_bin_restore_thyself (GstObject *object, xmlNodePtr self);
#endif
/* Bin signals and args */
enum {
OBJECT_ADDED,
LAST_SIGNAL
};
enum {
ARG_0,
/* FILL ME */
};
static void gst_bin_class_init (GstBinClass *klass);
static void gst_bin_init (GstBin *bin);
static GstElementClass *parent_class = NULL;
static guint gst_bin_signals[LAST_SIGNAL] = { 0 };
GType
gst_bin_get_type (void)
{
static GType bin_type = 0;
if (!bin_type) {
static const GTypeInfo bin_info = {
sizeof(GstBinClass),
NULL,
NULL,
(GClassInitFunc)gst_bin_class_init,
NULL,
NULL,
sizeof(GstBin),
8,
(GInstanceInitFunc)gst_bin_init,
NULL
};
bin_type = g_type_register_static (GST_TYPE_ELEMENT, "GstBin", &bin_info, 0);
}
return bin_type;
}
static void
gst_bin_class_init (GstBinClass *klass)
{
GObjectClass *gobject_class;
GstObjectClass *gstobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass*)klass;
gstobject_class = (GstObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
gst_bin_signals[OBJECT_ADDED] =
g_signal_new ("object_added", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GstBinClass, object_added), NULL, NULL,
gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1,
GST_TYPE_ELEMENT);
klass->change_state_type = GST_DEBUG_FUNCPTR (gst_bin_change_state_type);
klass->iterate = GST_DEBUG_FUNCPTR (gst_bin_iterate_func);
#ifndef GST_DISABLE_LOADSAVE
gstobject_class->save_thyself = GST_DEBUG_FUNCPTR (gst_bin_save_thyself);
gstobject_class->restore_thyself = GST_DEBUG_FUNCPTR (gst_bin_restore_thyself);
#endif
gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_bin_change_state);
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_bin_dispose);
}
static void
gst_bin_init (GstBin *bin)
{
// in general, we prefer to use cothreads for most things
GST_FLAG_SET (bin, GST_BIN_FLAG_PREFER_COTHREADS);
bin->numchildren = 0;
bin->children = NULL;
bin->eos_providers = NULL;
bin->num_eos_providers = 0;
bin->chains = NULL;
bin->eoscond = g_cond_new ();
}
/**
* gst_bin_new:
* @name: name of new bin
*
* Create a new bin with given name.
*
* Returns: new bin
*/
GstElement*
gst_bin_new (const gchar *name)
{
return gst_elementfactory_make ("bin", name);
}
static inline void
gst_bin_reset_element_sched (GstElement *element, GstSchedule *sched)
{
GST_INFO_ELEMENT (GST_CAT_PARENTAGE, element, "resetting element's scheduler");
// first remove the element from its current schedule, if any
// if (GST_ELEMENT_SCHED(element))
// GST_SCHEDULE_REMOVE_ELEMENT (GST_ELEMENT_SCHED(element), element);
// then set the new manager
gst_element_set_sched (element,sched);
// and add it to the new scheduler
// if (sched)
// GST_SCHEDULE_ADD_ELEMENT (sched, element);
}
static void
gst_bin_set_element_sched (GstElement *element,GstSchedule *sched)
{
GList *children;
GstElement *child;
g_return_if_fail (element != NULL);
g_return_if_fail (GST_IS_ELEMENT(element));
g_return_if_fail (sched != NULL);
g_return_if_fail (GST_IS_SCHEDULE(sched));
GST_INFO (GST_CAT_SCHEDULING, "setting element \"%s\" sched to %p",GST_ELEMENT_NAME(element),
sched);
// if it's actually a Bin
if (GST_IS_BIN(element)) {
if (GST_FLAG_IS_SET(element,GST_BIN_FLAG_MANAGER)) {
GST_INFO_ELEMENT (GST_CAT_PARENTAGE, element, "child is already a manager, not resetting");
return;
}
GST_INFO_ELEMENT (GST_CAT_PARENTAGE, element, "setting children's schedule to parent's");
GST_SCHEDULE_ADD_ELEMENT (sched, element);
// set the children's schedule
children = GST_BIN(element)->children;
while (children) {
child = GST_ELEMENT (children->data);
children = g_list_next(children);
gst_bin_set_element_sched (child, sched);
}
// otherwise, if it's just a regular old element
} else {
GST_SCHEDULE_ADD_ELEMENT (sched, element);
}
}
static void
gst_bin_unset_element_sched (GstElement *element)
{
GList *children;
GstElement *child;
g_return_if_fail (element != NULL);
g_return_if_fail (GST_IS_ELEMENT(element));
GST_INFO (GST_CAT_SCHEDULING, "removing element \"%s\" from it sched %p",
GST_ELEMENT_NAME(element),GST_ELEMENT_SCHED(element));
// if it's actually a Bin
if (GST_IS_BIN(element)) {
if (GST_FLAG_IS_SET(element,GST_BIN_FLAG_MANAGER)) {
GST_INFO_ELEMENT (GST_CAT_PARENTAGE, element, "child is already a manager, not unsetting sched");
return;
}
// FIXME this check should be irrelevant
if (GST_ELEMENT_SCHED (element))
GST_SCHEDULE_REMOVE_ELEMENT (GST_ELEMENT_SCHED(element), element);
// for each child, remove them from their schedule
children = GST_BIN(element)->children;
while (children) {
child = GST_ELEMENT (children->data);
children = g_list_next(children);
gst_bin_unset_element_sched (child);
}
// otherwise, if it's just a regular old element
} else {
// FIXME this check should be irrelevant
if (GST_ELEMENT_SCHED (element))
GST_SCHEDULE_REMOVE_ELEMENT (GST_ELEMENT_SCHED(element), element);
}
}
/**
* gst_bin_add:
* @bin: #GstBin to add element to
* @element: #GstElement to add to bin
*
* Add the given element to the bin. Set the elements parent, and thus
* add a reference.
*/
void
gst_bin_add (GstBin *bin,
GstElement *element)
{
g_return_if_fail (bin != NULL);
g_return_if_fail (GST_IS_BIN (bin));
g_return_if_fail (element != NULL);
g_return_if_fail (GST_IS_ELEMENT (element));
GST_DEBUG (GST_CAT_PARENTAGE, "adding element \"%s\" to bin \"%s\"\n",
GST_ELEMENT_NAME(element),GST_ELEMENT_NAME(bin));
// must be not be in PLAYING state in order to modify bin
// g_return_if_fail (GST_STATE (bin) != GST_STATE_PLAYING);
// the element must not already have a parent
g_return_if_fail (GST_ELEMENT_PARENT(element) == NULL);
// then check to see if the element's name is already taken in the bin
g_return_if_fail (gst_object_check_uniqueness (bin->children, GST_ELEMENT_NAME(element)) == TRUE);
// set the element's parent and add the element to the bin's list of children
gst_object_set_parent (GST_OBJECT (element), GST_OBJECT (bin));
bin->children = g_list_append (bin->children, element);
bin->numchildren++;
///// now we have to deal with manager stuff
// we can only do this if there's a scheduler:
// if we're not a manager, and aren't attached to anything, we have no sched (yet)
if (GST_ELEMENT_SCHED(bin) != NULL)
gst_bin_set_element_sched (element, GST_ELEMENT_SCHED(bin));
GST_INFO_ELEMENT (GST_CAT_PARENTAGE, bin, "added child \"%s\"", GST_ELEMENT_NAME (element));
g_signal_emit (G_OBJECT (bin), gst_bin_signals[OBJECT_ADDED], 0, element);
}
/**
* gst_bin_remove:
* @bin: #GstBin to remove element from
* @element: #GstElement to remove
*
* Remove the element from its associated bin, unparenting as well.
*/
void
gst_bin_remove (GstBin *bin,
GstElement *element)
{
g_return_if_fail (bin != NULL);
g_return_if_fail (GST_IS_BIN (bin));
g_return_if_fail (element != NULL);
g_return_if_fail (GST_IS_ELEMENT (element));
g_return_if_fail (bin->children != NULL);
// must not be in PLAYING state in order to modify bin
g_return_if_fail (GST_STATE (bin) != GST_STATE_PLAYING);
// the element must have its parent set to the current bin
g_return_if_fail (GST_ELEMENT_PARENT(element) == (GstObject *)bin);
// the element must be in the bin's list of children
if (g_list_find(bin->children, element) == NULL) {
// FIXME this should be a warning!!!
GST_ERROR_OBJECT(bin,element,"no such element in bin");
return;
}
// remove this element from the list of managed elements
gst_bin_unset_element_sched (element);
// now remove the element from the list of elements
bin->children = g_list_remove (bin->children, element);
bin->numchildren--;
GST_INFO_ELEMENT (GST_CAT_PARENTAGE, bin, "removed child %s", GST_ELEMENT_NAME (element));
gst_object_unparent (GST_OBJECT (element));
/* if we're down to zero children, force state to NULL */
if (bin->numchildren == 0 && GST_ELEMENT_SCHED (bin) != NULL)
gst_element_set_state (GST_ELEMENT (bin), GST_STATE_NULL);
}
static GstElementStateReturn
gst_bin_change_state (GstElement *element)
{
GstBin *bin;
GList *children;
GstElement *child;
GstElementStateReturn ret;
// GST_DEBUG_ENTER("(\"%s\")",GST_ELEMENT_NAME (element));
g_return_val_if_fail (GST_IS_BIN (element), GST_STATE_FAILURE);
bin = GST_BIN (element);
// GST_DEBUG (GST_CAT_STATES,"currently %d(%s), %d(%s) pending\n",GST_STATE (element),
// gst_element_statename (GST_STATE (element)), GST_STATE_PENDING (element),
// gst_element_statename (GST_STATE_PENDING (element)));
GST_INFO_ELEMENT (GST_CAT_STATES, element, "changing childrens' state from %s to %s",
gst_element_statename (GST_STATE (element)),
gst_element_statename (GST_STATE_PENDING (element)));
// g_return_val_if_fail(bin->numchildren != 0, GST_STATE_FAILURE);
// g_print("-->\n");
children = bin->children;
while (children) {
child = GST_ELEMENT (children->data);
// GST_DEBUG (GST_CAT_STATES,"setting state on '%s'\n",GST_ELEMENT_NAME (child));
switch (gst_element_set_state (child, GST_STATE_PENDING (element))) {
case GST_STATE_FAILURE:
GST_STATE_PENDING (element) = GST_STATE_VOID_PENDING;
GST_DEBUG (GST_CAT_STATES,"child '%s' failed to go to state %d(%s)\n", GST_ELEMENT_NAME (child),
GST_STATE_PENDING (element), gst_element_statename (GST_STATE_PENDING (element)));
return GST_STATE_FAILURE;
break;
case GST_STATE_ASYNC:
GST_DEBUG (GST_CAT_STATES,"child '%s' is changing state asynchronously\n", GST_ELEMENT_NAME (child));
break;
}
// g_print("\n");
children = g_list_next (children);
}
// g_print("<-- \"%s\"\n",GST_OBJECT_NAME(bin));
GST_INFO_ELEMENT (GST_CAT_STATES, element, "done changing bin's state from %s to %s",
gst_element_statename (GST_STATE (element)),
gst_element_statename (GST_STATE_PENDING (element)));
ret = gst_bin_change_state_norecurse (bin);
return ret;
}
static GstElementStateReturn
gst_bin_change_state_norecurse (GstBin *bin)
{
if (GST_ELEMENT_CLASS (parent_class)->change_state) {
GST_DEBUG_ELEMENT (GST_CAT_STATES, bin, "setting bin's own state\n");
return GST_ELEMENT_CLASS (parent_class)->change_state (GST_ELEMENT (bin));
} else
return GST_STATE_FAILURE;
}
static gboolean
gst_bin_change_state_type(GstBin *bin,
GstElementState state,
GType type)
{
GList *children;
GstElement *child;
// g_print("gst_bin_change_state_type(\"%s\",%d,%d);\n",
// GST_OBJECT_NAME(bin))),state,type);
g_return_val_if_fail (GST_IS_BIN (bin), FALSE);
g_return_val_if_fail (bin->numchildren != 0, FALSE);
// g_print("-->\n");
children = bin->children;
while (children) {
child = GST_ELEMENT (children->data);
if (GST_IS_BIN (child)) {
if (!gst_bin_set_state_type (GST_BIN (child), state,type))
return FALSE;
} else if (G_TYPE_CHECK_INSTANCE_TYPE (child,type)) {
if (!gst_element_set_state (child,state))
return FALSE;
}
// g_print("\n");
children = g_list_next (children);
}
if (type == GST_TYPE_BIN)
gst_element_set_state (GST_ELEMENT (bin),state);
return TRUE;
}
/**
* gst_bin_set_state_type:
* @bin: #GstBin to set the state
* @state: the new state to set the elements to
* @type: the type of elements to change
*
* Sets the state of only those objects of the given type.
*
* Returns: indication if the state change was successfull
*/
gboolean
gst_bin_set_state_type (GstBin *bin,
GstElementState state,
GType type)
{
GstBinClass *oclass;
GST_DEBUG (GST_CAT_STATES,"gst_bin_set_state_type(\"%s\",%d,%d)\n",
GST_ELEMENT_NAME (bin), state,type);
g_return_val_if_fail (bin != NULL, FALSE);
g_return_val_if_fail (GST_IS_BIN (bin), FALSE);
oclass = GST_BIN_CLASS (G_OBJECT_GET_CLASS(bin));
if (oclass->change_state_type)
(oclass->change_state_type) (bin,state,type);
return TRUE;
}
static void
gst_bin_dispose (GObject *object)
{
GstBin *bin = GST_BIN (object);
GList *children, *orig;
GstElement *child;
GST_DEBUG (GST_CAT_REFCOUNTING,"dispose\n");
if (bin->children) {
orig = children = g_list_copy (bin->children);
while (children) {
child = GST_ELEMENT (children->data);
//gst_object_unref (GST_OBJECT (child));
//gst_object_unparent (GST_OBJECT (child));
gst_bin_remove (bin, child);
children = g_list_next (children);
}
g_list_free (orig);
g_list_free (bin->children);
}
bin->children = NULL;
bin->numchildren = 0;
g_cond_free (bin->eoscond);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
/**
* gst_bin_get_by_name:
* @bin: #Gstbin to search
* @name: the element name to search for
*
* Get the element with the given name from this bin.
*
* Returns: the element with the given name
*/
GstElement*
gst_bin_get_by_name (GstBin *bin,
const gchar *name)
{
GList *children;
GstElement *child;
g_return_val_if_fail (bin != NULL, NULL);
g_return_val_if_fail (GST_IS_BIN (bin), NULL);
g_return_val_if_fail (name != NULL, NULL);
GST_INFO_ELEMENT (GST_CAT_PARENTAGE, bin, "looking up child element %s", name);
children = bin->children;
while (children) {
child = GST_ELEMENT (children->data);
if (!strcmp (GST_OBJECT_NAME(child),name))
return child;
if (GST_IS_BIN (child)) {
GstElement *res = gst_bin_get_by_name (GST_BIN (child), name);
if (res)
return res;
}
children = g_list_next (children);
}
return NULL;
}
/**
* gst_bin_get_by_name_recurse_up:
* @bin: #Gstbin to search
* @name: the element name to search for
*
* Get the element with the given name from this bin. If the
* element is not found, a recursion is performed on the parent bin.
*
* Returns: the element with the given name
*/
GstElement*
gst_bin_get_by_name_recurse_up (GstBin *bin,
const gchar *name)
{
GstElement *result = NULL;
GstObject *parent;
g_return_val_if_fail (bin != NULL, NULL);
g_return_val_if_fail (GST_IS_BIN (bin), NULL);
g_return_val_if_fail (name != NULL, NULL);
result = gst_bin_get_by_name (bin, name);
if (result)
return result;
parent = gst_object_get_parent (GST_OBJECT (bin));
if (parent && GST_IS_BIN (parent)) {
result = gst_bin_get_by_name_recurse_up (GST_BIN (parent), name);
}
return result;
}
/**
* gst_bin_get_list:
* @bin: #Gstbin to get the list from
*
* Get the list of elements in this bin.
*
* Returns: a GList of elements
*/
GList*
gst_bin_get_list (GstBin *bin)
{
g_return_val_if_fail (bin != NULL, NULL);
g_return_val_if_fail (GST_IS_BIN (bin), NULL);
return bin->children;
}
#ifndef GST_DISABLE_LOADSAVE
static xmlNodePtr
gst_bin_save_thyself (GstObject *object,
xmlNodePtr parent)
{
GstBin *bin = GST_BIN (object);
xmlNodePtr childlist, elementnode;
GList *children;
GstElement *child;
if (GST_OBJECT_CLASS (parent_class)->save_thyself)
GST_OBJECT_CLASS (parent_class)->save_thyself (GST_OBJECT (bin), parent);
childlist = xmlNewChild (parent, NULL, "children", NULL);
GST_INFO_ELEMENT (GST_CAT_XML, bin, "saving %d children", bin->numchildren);
children = bin->children;
while (children) {
child = GST_ELEMENT (children->data);
elementnode = xmlNewChild (childlist, NULL, "element", NULL);
gst_object_save_thyself (GST_OBJECT (child), elementnode);
children = g_list_next (children);
}
return childlist;
}
static void
gst_bin_restore_thyself (GstObject *object,
xmlNodePtr self)
{
GstBin *bin = GST_BIN (object);
xmlNodePtr field = self->xmlChildrenNode;
xmlNodePtr childlist;
while (field) {
if (!strcmp (field->name, "children")) {
GST_INFO_ELEMENT (GST_CAT_XML, GST_ELEMENT (object), "loading children");
childlist = field->xmlChildrenNode;
while (childlist) {
if (!strcmp (childlist->name, "element")) {
GstElement *element = gst_element_restore_thyself (childlist, GST_OBJECT (bin));
gst_bin_add (bin, element);
}
childlist = childlist->next;
}
}
field = field->next;
}
}
#endif /* GST_DISABLE_LOADSAVE */
/**
* gst_bin_iterate:
* @bin: #Gstbin to iterate
*
* Iterates over the elements in this bin.
*
* Returns: TRUE if the bin did something usefull. This value
* can be used to determine it the bin is in EOS.
*/
gboolean
gst_bin_iterate (GstBin *bin)
{
GstBinClass *oclass;
gboolean eos = TRUE;
GST_DEBUG_ENTER("(\"%s\")",GST_ELEMENT_NAME (bin));
oclass = GST_BIN_CLASS (G_OBJECT_GET_CLASS(bin));
if (oclass->iterate)
eos = (oclass->iterate) (bin);
GST_DEBUG_LEAVE("(\"%s\")",GST_ELEMENT_NAME (bin));
return eos;
}
/* out internal element fired EOS, we decrement the number of pending EOS childs */
G_GNUC_UNUSED static void
gst_bin_received_eos (GstElement *element, GstBin *bin)
{
GST_INFO_ELEMENT (GST_CAT_PLANNING, bin, "child %s fired eos, pending %d", GST_ELEMENT_NAME (element),
bin->num_eos_providers);
GST_LOCK (bin);
if (bin->num_eos_providers) {
bin->num_eos_providers--;
g_cond_signal (bin->eoscond);
}
GST_UNLOCK (bin);
}
typedef struct {
gulong offset;
gulong size;
} region_struct;
static gboolean
gst_bin_iterate_func (GstBin *bin)
{
// only iterate if this is the manager bin
if (GST_ELEMENT_SCHED(bin)->parent == GST_ELEMENT (bin)) {
return GST_SCHEDULE_ITERATE(GST_ELEMENT_SCHED(bin));
} else {
GST_DEBUG (GST_CAT_SCHEDULING, "this bin can't be iterated on!\n");
}
return FALSE;
}