2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wtay@chello.be>
4 * 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
6 * gstelementfactory.c: GstElementFactory object, support routines
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
21 * Boston, MA 02110-1301, USA.
25 * SECTION:gstelementfactory
26 * @short_description: Create GstElements from a factory
27 * @see_also: #GstElement, #GstPlugin, #GstPluginFeature, #GstPadTemplate.
29 * #GstElementFactory is used to create instances of elements. A
30 * GstElementFactory can be added to a #GstPlugin as it is also a
33 * Use the gst_element_factory_find() and gst_element_factory_create()
34 * functions to create element instances or use gst_element_factory_make() as a
35 * convenient shortcut.
37 * The following code example shows you how to create a GstFileSrc element.
40 * <title>Using an element factory</title>
41 * <programlisting language="c">
42 * #include <gst/gst.h>
45 * GstElementFactory *srcfactory;
47 * gst_init (&argc, &argv);
49 * srcfactory = gst_element_factory_find ("filesrc");
50 * g_return_if_fail (srcfactory != NULL);
51 * src = gst_element_factory_create (srcfactory, "src");
52 * g_return_if_fail (src != NULL);
58 #include "gst_private.h"
60 #include "gstelement.h"
61 #include "gstelementmetadata.h"
64 #include "gstregistry.h"
67 #include "glib-compat-private.h"
69 GST_DEBUG_CATEGORY_STATIC (element_factory_debug);
70 #define GST_CAT_DEFAULT element_factory_debug
72 static void gst_element_factory_finalize (GObject * object);
73 static void gst_element_factory_cleanup (GstElementFactory * factory);
75 /* static guint gst_element_factory_signals[LAST_SIGNAL] = { 0 }; */
77 /* this is defined in gstelement.c */
78 extern GQuark __gst_elementclass_factory;
82 GST_DEBUG_CATEGORY_INIT (element_factory_debug, "GST_ELEMENT_FACTORY", \
83 GST_DEBUG_BOLD | GST_DEBUG_FG_WHITE | GST_DEBUG_BG_RED, \
84 "element factories keep information about installed elements"); \
87 G_DEFINE_TYPE_WITH_CODE (GstElementFactory, gst_element_factory,
88 GST_TYPE_PLUGIN_FEATURE, _do_init);
90 #ifdef TIZEN_PROFILE_TV
91 static GMutex pool_mutex;
92 static GList *pool = NULL;
96 gst_element_factory_class_init (GstElementFactoryClass * klass)
98 GObjectClass *gobject_class = (GObjectClass *) klass;
100 gobject_class->finalize = gst_element_factory_finalize;
104 gst_element_factory_init (GstElementFactory * factory)
106 factory->staticpadtemplates = NULL;
107 factory->numpadtemplates = 0;
109 factory->uri_type = GST_URI_UNKNOWN;
110 factory->uri_protocols = NULL;
112 factory->interfaces = NULL;
116 gst_element_factory_finalize (GObject * object)
118 GstElementFactory *factory = GST_ELEMENT_FACTORY (object);
120 gst_element_factory_cleanup (factory);
121 G_OBJECT_CLASS (gst_element_factory_parent_class)->finalize (object);
125 * gst_element_factory_find:
126 * @name: name of factory to find
128 * Search for an element factory of the given name. Refs the returned
129 * element factory; caller is responsible for unreffing.
131 * Returns: (transfer full) (nullable): #GstElementFactory if found,
135 gst_element_factory_find (const gchar * name)
137 GstPluginFeature *feature;
139 g_return_val_if_fail (name != NULL, NULL);
141 feature = gst_registry_find_feature (gst_registry_get (), name,
142 GST_TYPE_ELEMENT_FACTORY);
144 return GST_ELEMENT_FACTORY (feature);
146 /* this isn't an error, for instance when you query if an element factory is
148 GST_LOG ("no such element factory \"%s\"", name);
153 gst_element_factory_cleanup (GstElementFactory * factory)
157 if (factory->metadata) {
158 gst_structure_free ((GstStructure *) factory->metadata);
159 factory->metadata = NULL;
162 factory->type = G_TYPE_INVALID;
165 for (item = factory->staticpadtemplates; item; item = item->next) {
166 GstStaticPadTemplate *templ = item->data;
168 gst_static_caps_cleanup (&templ->static_caps);
169 g_slice_free (GstStaticPadTemplate, templ);
171 g_list_free (factory->staticpadtemplates);
172 factory->staticpadtemplates = NULL;
173 factory->numpadtemplates = 0;
174 factory->uri_type = GST_URI_UNKNOWN;
175 if (factory->uri_protocols) {
176 g_strfreev (factory->uri_protocols);
177 factory->uri_protocols = NULL;
180 g_list_free (factory->interfaces);
181 factory->interfaces = NULL;
184 #define CHECK_METADATA_FIELD(klass, name, key) \
186 const gchar *metafield = gst_element_class_get_metadata (klass, key); \
187 if (G_UNLIKELY (metafield == NULL || *metafield == '\0')) { \
188 g_warning ("Element factory metadata for '%s' has no valid %s field", name, key); \
194 * gst_element_register:
195 * @plugin: (allow-none): #GstPlugin to register the element with, or %NULL for
197 * @name: name of elements of this type
198 * @rank: rank of element (higher rank means more importance when autoplugging)
199 * @type: GType of element to register
201 * Create a new elementfactory capable of instantiating objects of the
202 * @type and add the factory to @plugin.
204 * Returns: %TRUE, if the registering succeeded, %FALSE on error
207 gst_element_register (GstPlugin * plugin, const gchar * name, guint rank,
210 GstPluginFeature *existing_feature;
211 GstRegistry *registry;
212 GstElementFactory *factory;
214 guint n_interfaces, i;
215 GstElementClass *klass;
218 g_return_val_if_fail (name != NULL, FALSE);
219 g_return_val_if_fail (g_type_is_a (type, GST_TYPE_ELEMENT), FALSE);
221 registry = gst_registry_get ();
223 /* check if feature already exists, if it exists there is no need to update it
224 * when the registry is getting updated, outdated plugins and all their
225 * features are removed and readded.
227 existing_feature = gst_registry_lookup_feature (registry, name);
228 if (existing_feature) {
229 GST_DEBUG_OBJECT (registry, "update existing feature %p (%s)",
230 existing_feature, name);
231 factory = GST_ELEMENT_FACTORY_CAST (existing_feature);
232 factory->type = type;
233 existing_feature->loaded = TRUE;
234 g_type_set_qdata (type, __gst_elementclass_factory, factory);
235 gst_object_unref (existing_feature);
240 GST_ELEMENT_FACTORY_CAST (g_object_newv (GST_TYPE_ELEMENT_FACTORY, 0,
242 gst_plugin_feature_set_name (GST_PLUGIN_FEATURE_CAST (factory), name);
243 GST_LOG_OBJECT (factory, "Created new elementfactory for type %s",
246 /* provide info needed during class structure setup */
247 g_type_set_qdata (type, __gst_elementclass_factory, factory);
248 klass = GST_ELEMENT_CLASS (g_type_class_ref (type));
250 CHECK_METADATA_FIELD (klass, name, GST_ELEMENT_METADATA_LONGNAME);
251 CHECK_METADATA_FIELD (klass, name, GST_ELEMENT_METADATA_KLASS);
252 CHECK_METADATA_FIELD (klass, name, GST_ELEMENT_METADATA_DESCRIPTION);
253 CHECK_METADATA_FIELD (klass, name, GST_ELEMENT_METADATA_AUTHOR);
255 factory->type = type;
256 factory->metadata = gst_structure_copy ((GstStructure *) klass->metadata);
258 for (item = klass->padtemplates; item; item = item->next) {
259 GstPadTemplate *templ = item->data;
260 GstStaticPadTemplate *newt;
261 gchar *caps_string = gst_caps_to_string (templ->caps);
263 newt = g_slice_new (GstStaticPadTemplate);
264 newt->name_template = g_intern_string (templ->name_template);
265 newt->direction = templ->direction;
266 newt->presence = templ->presence;
267 newt->static_caps.caps = NULL;
268 newt->static_caps.string = g_intern_string (caps_string);
269 factory->staticpadtemplates =
270 g_list_append (factory->staticpadtemplates, newt);
272 g_free (caps_string);
274 factory->numpadtemplates = klass->numpadtemplates;
276 /* special stuff for URI handling */
277 if (g_type_is_a (type, GST_TYPE_URI_HANDLER)) {
278 GstURIHandlerInterface *iface = (GstURIHandlerInterface *)
279 g_type_interface_peek (klass, GST_TYPE_URI_HANDLER);
281 if (!iface || !iface->get_type || !iface->get_protocols)
284 factory->uri_type = iface->get_type (factory->type);
285 if (!GST_URI_TYPE_IS_VALID (factory->uri_type))
287 if (iface->get_protocols) {
288 const gchar *const *protocols;
290 protocols = iface->get_protocols (factory->type);
291 factory->uri_protocols = g_strdupv ((gchar **) protocols);
293 if (!factory->uri_protocols)
297 interfaces = g_type_interfaces (type, &n_interfaces);
298 for (i = 0; i < n_interfaces; i++) {
299 __gst_element_factory_add_interface (factory, g_type_name (interfaces[i]));
303 if (plugin && plugin->desc.name) {
304 GST_PLUGIN_FEATURE_CAST (factory)->plugin_name = plugin->desc.name;
305 GST_PLUGIN_FEATURE_CAST (factory)->plugin = plugin;
306 g_object_add_weak_pointer ((GObject *) plugin,
307 (gpointer *) & GST_PLUGIN_FEATURE_CAST (factory)->plugin);
309 GST_PLUGIN_FEATURE_CAST (factory)->plugin_name = "NULL";
310 GST_PLUGIN_FEATURE_CAST (factory)->plugin = NULL;
312 gst_plugin_feature_set_rank (GST_PLUGIN_FEATURE_CAST (factory), rank);
313 GST_PLUGIN_FEATURE_CAST (factory)->loaded = TRUE;
315 gst_registry_add_feature (registry, GST_PLUGIN_FEATURE_CAST (factory));
322 GST_WARNING_OBJECT (factory, "error with uri handler!");
323 gst_element_factory_cleanup (factory);
329 gst_element_factory_cleanup (factory);
335 * gst_element_factory_create:
336 * @factory: factory to instantiate
337 * @name: (allow-none): name of new element, or %NULL to automatically create
340 * Create a new element of the type defined by the given elementfactory.
341 * It will be given the name supplied, since all elements require a name as
342 * their first argument.
344 * Returns: (transfer floating) (nullable): new #GstElement or %NULL
345 * if the element couldn't be created
348 gst_element_factory_create (GstElementFactory * factory, const gchar * name)
351 GstElementClass *oclass;
352 GstElementFactory *newfactory;
354 g_return_val_if_fail (factory != NULL, NULL);
357 GST_ELEMENT_FACTORY (gst_plugin_feature_load (GST_PLUGIN_FEATURE
360 if (newfactory == NULL)
363 factory = newfactory;
366 GST_INFO ("creating element \"%s\" named \"%s\"",
367 GST_OBJECT_NAME (factory), GST_STR_NULL (name));
369 GST_INFO ("creating element \"%s\"", GST_OBJECT_NAME (factory));
371 if (factory->type == 0)
374 /* create an instance of the element, cast so we don't assert on NULL
375 * also set name as early as we can
379 GST_ELEMENT_CAST (g_object_new (factory->type, "name", name, NULL));
381 element = GST_ELEMENT_CAST (g_object_newv (factory->type, 0, NULL));
382 if (G_UNLIKELY (element == NULL))
385 /* fill in the pointer to the factory in the element class. The
386 * class will not be unreffed currently.
387 * Be thread safe as there might be 2 threads creating the first instance of
388 * an element at the same moment
390 oclass = GST_ELEMENT_GET_CLASS (element);
391 if (!g_atomic_pointer_compare_and_exchange (&oclass->elementfactory, NULL,
393 gst_object_unref (factory);
395 GST_DEBUG ("created element \"%s\"", GST_OBJECT_NAME (factory));
402 GST_WARNING_OBJECT (factory,
403 "loading plugin containing feature %s returned NULL!", name);
408 GST_WARNING_OBJECT (factory, "factory has no type");
409 gst_object_unref (factory);
414 GST_WARNING_OBJECT (factory, "could not create element");
415 gst_object_unref (factory);
421 * gst_element_factory_make:
422 * @factoryname: a named factory to instantiate
423 * @name: (allow-none): name of new element, or %NULL to automatically create
426 * Create a new element of the type defined by the given element factory.
427 * If name is %NULL, then the element will receive a guaranteed unique name,
428 * consisting of the element factory name and a number.
429 * If name is given, it will be given the name supplied.
431 * Returns: (transfer floating) (nullable): new #GstElement or %NULL
432 * if unable to create element
435 gst_element_factory_make (const gchar * factoryname, const gchar * name)
437 GstElementFactory *factory;
440 g_return_val_if_fail (factoryname != NULL, NULL);
441 g_return_val_if_fail (gst_is_initialized (), NULL);
443 GST_LOG ("gstelementfactory: make \"%s\" \"%s\"",
444 factoryname, GST_STR_NULL (name));
446 factory = gst_element_factory_find (factoryname);
450 GST_LOG_OBJECT (factory, "found factory %p", factory);
451 element = gst_element_factory_create (factory, name);
455 gst_object_unref (factory);
461 GST_INFO ("no such element factory \"%s\"!", factoryname);
466 GST_INFO_OBJECT (factory, "couldn't create instance!");
467 gst_object_unref (factory);
473 __gst_element_factory_add_static_pad_template (GstElementFactory * factory,
474 GstStaticPadTemplate * templ)
476 g_return_if_fail (factory != NULL);
477 g_return_if_fail (templ != NULL);
479 factory->staticpadtemplates =
480 g_list_append (factory->staticpadtemplates, templ);
481 factory->numpadtemplates++;
485 * gst_element_factory_get_element_type:
486 * @factory: factory to get managed #GType from
488 * Get the #GType for elements managed by this factory. The type can
489 * only be retrieved if the element factory is loaded, which can be
490 * assured with gst_plugin_feature_load().
492 * Returns: the #GType for elements managed by this factory or 0 if
493 * the factory is not loaded.
496 gst_element_factory_get_element_type (GstElementFactory * factory)
498 g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), 0);
500 return factory->type;
504 * gst_element_factory_get_metadata:
505 * @factory: a #GstElementFactory
508 * Get the metadata on @factory with @key.
510 * Returns: (nullable): the metadata with @key on @factory or %NULL
511 * when there was no metadata with the given @key.
514 gst_element_factory_get_metadata (GstElementFactory * factory,
517 return gst_structure_get_string ((GstStructure *) factory->metadata, key);
521 * gst_element_factory_get_metadata_keys:
522 * @factory: a #GstElementFactory
524 * Get the available keys for the metadata on @factory.
526 * Returns: (transfer full) (element-type utf8) (array zero-terminated=1) (nullable):
527 * a %NULL-terminated array of key strings, or %NULL when there is no
528 * metadata. Free with g_strfreev() when no longer needed.
531 gst_element_factory_get_metadata_keys (GstElementFactory * factory)
533 GstStructure *metadata;
537 g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), NULL);
539 metadata = (GstStructure *) factory->metadata;
540 if (metadata == NULL)
543 num = gst_structure_n_fields (metadata);
547 arr = g_new (gchar *, num + 1);
548 for (i = 0; i < num; ++i) {
549 arr[i] = g_strdup (gst_structure_nth_field_name (metadata, i));
556 * gst_element_factory_get_num_pad_templates:
557 * @factory: a #GstElementFactory
559 * Gets the number of pad_templates in this factory.
561 * Returns: the number of pad_templates
564 gst_element_factory_get_num_pad_templates (GstElementFactory * factory)
566 g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), 0);
568 return factory->numpadtemplates;
572 * __gst_element_factory_add_interface:
573 * @elementfactory: The elementfactory to add the interface to
574 * @interfacename: Name of the interface
576 * Adds the given interfacename to the list of implemented interfaces of the
580 __gst_element_factory_add_interface (GstElementFactory * elementfactory,
581 const gchar * interfacename)
583 g_return_if_fail (GST_IS_ELEMENT_FACTORY (elementfactory));
584 g_return_if_fail (interfacename != NULL);
585 g_return_if_fail (interfacename[0] != '\0'); /* no empty string */
587 elementfactory->interfaces =
588 g_list_prepend (elementfactory->interfaces,
589 (gpointer) g_intern_string (interfacename));
593 * gst_element_factory_get_static_pad_templates:
594 * @factory: a #GstElementFactory
596 * Gets the #GList of #GstStaticPadTemplate for this factory.
598 * Returns: (transfer none) (element-type Gst.StaticPadTemplate): the
599 * static pad templates
602 gst_element_factory_get_static_pad_templates (GstElementFactory * factory)
604 g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), NULL);
606 return factory->staticpadtemplates;
610 * gst_element_factory_get_uri_type:
611 * @factory: a #GstElementFactory
613 * Gets the type of URIs the element supports or #GST_URI_UNKNOWN if none.
615 * Returns: type of URIs this element supports
618 gst_element_factory_get_uri_type (GstElementFactory * factory)
620 g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), GST_URI_UNKNOWN);
622 return factory->uri_type;
626 * gst_element_factory_get_uri_protocols:
627 * @factory: a #GstElementFactory
629 * Gets a %NULL-terminated array of protocols this element supports or %NULL if
630 * no protocols are supported. You may not change the contents of the returned
631 * array, as it is still owned by the element factory. Use g_strdupv() to
632 * make a copy of the protocol string array if you need to.
634 * Returns: (transfer none) (array zero-terminated=1): the supported protocols
638 gst_element_factory_get_uri_protocols (GstElementFactory * factory)
640 g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), NULL);
642 return (const gchar * const *) factory->uri_protocols;
646 * gst_element_factory_has_interface:
647 * @factory: a #GstElementFactory
648 * @interfacename: an interface name
650 * Check if @factory implements the interface with name @interfacename.
652 * Returns: %TRUE when @factory implement the interface.
655 gst_element_factory_has_interface (GstElementFactory * factory,
656 const gchar * interfacename)
660 g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), FALSE);
662 for (walk = factory->interfaces; walk; walk = g_list_next (walk)) {
663 gchar *iname = (gchar *) walk->data;
665 if (!strcmp (iname, interfacename))
674 GstElementFactoryListType type;
680 * gst_element_factory_list_is_type:
681 * @factory: a #GstElementFactory
682 * @type: a #GstElementFactoryListType
684 * Check if @factory is of the given types.
686 * Returns: %TRUE if @factory is of @type.
689 gst_element_factory_list_is_type (GstElementFactory * factory,
690 GstElementFactoryListType type)
692 gboolean res = FALSE;
696 gst_element_factory_get_metadata (factory, GST_ELEMENT_METADATA_KLASS);
699 GST_ERROR_OBJECT (factory, "element factory is missing klass identifiers");
703 /* Filter by element type first, as soon as it matches
704 * one type, we skip all other tests */
705 if (!res && (type & GST_ELEMENT_FACTORY_TYPE_SINK))
706 res = (strstr (klass, "Sink") != NULL);
708 if (!res && (type & GST_ELEMENT_FACTORY_TYPE_SRC))
709 res = (strstr (klass, "Source") != NULL);
711 if (!res && (type & GST_ELEMENT_FACTORY_TYPE_DECODER))
712 res = (strstr (klass, "Decoder") != NULL);
714 if (!res && (type & GST_ELEMENT_FACTORY_TYPE_ENCODER))
715 res = (strstr (klass, "Encoder") != NULL);
717 if (!res && (type & GST_ELEMENT_FACTORY_TYPE_MUXER))
718 res = (strstr (klass, "Muxer") != NULL);
720 if (!res && (type & GST_ELEMENT_FACTORY_TYPE_DEMUXER))
721 res = (strstr (klass, "Demux") != NULL);
723 /* FIXME : We're actually parsing two Classes here... */
724 if (!res && (type & GST_ELEMENT_FACTORY_TYPE_PARSER))
725 res = ((strstr (klass, "Parser") != NULL)
726 && (strstr (klass, "Codec") != NULL));
728 if (!res && (type & GST_ELEMENT_FACTORY_TYPE_DEPAYLOADER))
729 res = (strstr (klass, "Depayloader") != NULL);
731 if (!res && (type & GST_ELEMENT_FACTORY_TYPE_PAYLOADER))
732 res = (strstr (klass, "Payloader") != NULL);
734 if (!res && (type & GST_ELEMENT_FACTORY_TYPE_FORMATTER))
735 res = (strstr (klass, "Formatter") != NULL);
737 if (!res && (type & GST_ELEMENT_FACTORY_TYPE_DECRYPTOR))
738 res = (strstr (klass, "Decryptor") != NULL);
740 if (!res && (type & GST_ELEMENT_FACTORY_TYPE_ENCRYPTOR))
741 res = (strstr (klass, "Encryptor") != NULL);
743 /* Filter by media type now, we only test if it
744 * matched any of the types above or only checking the media
745 * type was requested. */
746 if ((res || !(type & (GST_ELEMENT_FACTORY_TYPE_MAX_ELEMENTS - 1)))
747 && (type & (GST_ELEMENT_FACTORY_TYPE_MEDIA_AUDIO |
748 GST_ELEMENT_FACTORY_TYPE_MEDIA_VIDEO |
749 GST_ELEMENT_FACTORY_TYPE_MEDIA_IMAGE |
750 GST_ELEMENT_FACTORY_TYPE_MEDIA_SUBTITLE |
751 GST_ELEMENT_FACTORY_TYPE_MEDIA_METADATA)))
752 res = ((type & GST_ELEMENT_FACTORY_TYPE_MEDIA_AUDIO)
753 && (strstr (klass, "Audio") != NULL))
754 || ((type & GST_ELEMENT_FACTORY_TYPE_MEDIA_VIDEO)
755 && (strstr (klass, "Video") != NULL))
756 || ((type & GST_ELEMENT_FACTORY_TYPE_MEDIA_IMAGE)
757 && (strstr (klass, "Image") != NULL)) ||
758 ((type & GST_ELEMENT_FACTORY_TYPE_MEDIA_SUBTITLE)
759 && (strstr (klass, "Subtitle") != NULL)) ||
760 ((type & GST_ELEMENT_FACTORY_TYPE_MEDIA_METADATA)
761 && (strstr (klass, "Metadata") != NULL));
767 element_filter (GstPluginFeature * feature, FilterData * data)
771 /* we only care about element factories */
772 if (G_UNLIKELY (!GST_IS_ELEMENT_FACTORY (feature)))
775 res = (gst_plugin_feature_get_rank (feature) >= data->minrank) &&
776 gst_element_factory_list_is_type (GST_ELEMENT_FACTORY_CAST (feature),
783 * gst_element_factory_list_get_elements:
784 * @type: a #GstElementFactoryListType
785 * @minrank: Minimum rank
787 * Get a list of factories that match the given @type. Only elements
788 * with a rank greater or equal to @minrank will be returned.
789 * The list of factories is returned by decreasing rank.
791 * Returns: (transfer full) (element-type Gst.ElementFactory): a #GList of
792 * #GstElementFactory elements. Use gst_plugin_feature_list_free() after
796 gst_element_factory_list_get_elements (GstElementFactoryListType type,
804 data.minrank = minrank;
806 /* get the feature list using the filter */
807 result = gst_registry_feature_filter (gst_registry_get (),
808 (GstPluginFeatureFilter) element_filter, FALSE, &data);
810 /* sort on rank and name */
811 result = g_list_sort (result, gst_plugin_feature_rank_compare_func);
817 * gst_element_factory_list_filter:
818 * @list: (transfer none) (element-type Gst.ElementFactory): a #GList of
819 * #GstElementFactory to filter
821 * @direction: a #GstPadDirection to filter on
822 * @subsetonly: whether to filter on caps subsets or not.
824 * Filter out all the elementfactories in @list that can handle @caps in
825 * the given direction.
827 * If @subsetonly is %TRUE, then only the elements whose pads templates
828 * are a complete superset of @caps will be returned. Else any element
829 * whose pad templates caps can intersect with @caps will be returned.
831 * Returns: (transfer full) (element-type Gst.ElementFactory): a #GList of
832 * #GstElementFactory elements that match the given requisites.
833 * Use #gst_plugin_feature_list_free after usage.
836 gst_element_factory_list_filter (GList * list,
837 const GstCaps * caps, GstPadDirection direction, gboolean subsetonly)
839 GQueue results = G_QUEUE_INIT;
841 GST_DEBUG ("finding factories");
843 /* loop over all the factories */
844 for (; list; list = list->next) {
845 GstElementFactory *factory;
846 const GList *templates;
849 factory = (GstElementFactory *) list->data;
851 GST_DEBUG ("Trying %s",
852 gst_plugin_feature_get_name ((GstPluginFeature *) factory));
854 /* get the templates from the element factory */
855 templates = gst_element_factory_get_static_pad_templates (factory);
856 for (walk = (GList *) templates; walk; walk = g_list_next (walk)) {
857 GstStaticPadTemplate *templ = walk->data;
859 /* we only care about the sink templates */
860 if (templ->direction == direction) {
863 /* try to intersect the caps with the caps of the template */
864 tmpl_caps = gst_static_caps_get (&templ->static_caps);
866 /* FIXME, intersect is not the right method, we ideally want to check
867 * for a subset here */
869 /* check if the intersection is empty */
870 if ((subsetonly && gst_caps_is_subset (caps, tmpl_caps)) ||
871 (!subsetonly && gst_caps_can_intersect (caps, tmpl_caps))) {
872 /* non empty intersection, we can use this element */
873 g_queue_push_tail (&results, gst_object_ref (factory));
874 gst_caps_unref (tmpl_caps);
877 gst_caps_unref (tmpl_caps);
884 #ifdef TIZEN_PROFILE_TV
886 * gst_element_factory_pool_push:
888 * Pushes the element to the pool. This function increase the refcount of @element.
889 * And the pool will take a reference forever.
893 gst_element_factory_pool_push (GstElement * element)
895 gboolean ret = FALSE;
896 g_return_val_if_fail (element != NULL, FALSE);
897 g_return_val_if_fail (GST_IS_ELEMENT (element) == TRUE, FALSE);
898 g_return_val_if_fail (GST_IS_BIN (element) == FALSE, FALSE);
899 g_return_val_if_fail (GST_IS_PIPELINE (element) == FALSE, FALSE);
901 g_mutex_lock (&pool_mutex);
902 if (!g_list_find (pool, (gconstpointer) element)) {
903 gst_object_ref (element);
904 pool = g_list_prepend (pool, element);
907 //GST_INFO("ret[ %d ], [ %s / %p ] - refcount[ %d ], state[ %d ]", ret, GST_ELEMENT_NAME(element), element, GST_OBJECT_REFCOUNT(element), GST_STATE (element));
908 g_mutex_unlock (&pool_mutex);
913 is_available_element (gconstpointer data, gconstpointer factory_)
915 GstElement *element = GST_ELEMENT_CAST (data);
916 const GstElementFactory *factory = (const GstElementFactory *) factory_;
917 gboolean found = FALSE;
918 if (gst_element_get_factory (element) == factory
919 && GST_ELEMENT_PARENT (element) == NULL
920 && GST_OBJECT_REFCOUNT (element) == 1
921 && (GST_STATE (element) == GST_STATE_NULL
922 || GST_STATE (element) == GST_STATE_VOID_PENDING)) {
925 //GST_DEBUG("PARENT[ %p ], [ %s / %p ] - refcount[ %d ], state[ %d ]", GST_ELEMENT_PARENT(element), GST_ELEMENT_NAME(element), element, GST_OBJECT_REFCOUNT(element), GST_STATE (element));
934 * gst_element_factory_pool_get:
936 * Get a element which is created by given @factoryname
937 * You can search any element by this API before you use gst_element_factory_create.
938 * Returns: (transfer full): a pointer to the #GstElement.
939 * This function guarantee that the refcount of returned #GstElement is 1,
940 * and it's state is NULL-STATE.
945 gst_element_factory_pool_get (GstElementFactory * factory,
946 const gchar * new_element_name)
948 GstElement *element = NULL;
950 g_return_val_if_fail (new_element_name != NULL, NULL);
951 g_return_val_if_fail (factory != NULL, NULL);
952 g_return_val_if_fail (pool != NULL, NULL);
954 g_mutex_lock (&pool_mutex);
955 found = g_list_find_custom (pool, factory, is_available_element);
957 element = GST_ELEMENT_CAST (found->data);
958 gst_object_ref (element);
959 if (new_element_name)
960 gst_element_set_name (element, new_element_name);
962 g_mutex_unlock (&pool_mutex);
966 /* First, Try to get element from pool. */
968 gst_element_factory_get (GstElementFactory * factory, const gchar * name)
970 GstElement *element = NULL;
971 g_return_val_if_fail (factory != NULL, NULL);
972 element = gst_element_factory_pool_get (factory, name);
974 element = gst_element_factory_create (factory, name);
976 GST_ERROR ("[ %s / %p ], new element name[ %s ]",
977 GST_OBJECT_NAME (factory), factory, name);
980 gst_element_factory_pool_push (element);
982 gst_set_family_id_to_child (element, 0);
985 //GST_INFO("[ %s / %p ] - refcount[ %d ], state[ %d ]", GST_ELEMENT_NAME(element), element, GST_OBJECT_REFCOUNT(element), GST_STATE (element));