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 * @title: GstElementFactory
27 * @short_description: Create GstElements from a factory
28 * @see_also: #GstElement, #GstPlugin, #GstPluginFeature, #GstPadTemplate.
30 * #GstElementFactory is used to create instances of elements. A
31 * GstElementFactory can be added to a #GstPlugin as it is also a
34 * Use the gst_element_factory_find() and gst_element_factory_create()
35 * functions to create element instances or use gst_element_factory_make() as a
36 * convenient shortcut.
38 * The following code example shows you how to create a GstFileSrc element.
40 * ## Using an element factory
41 * |[<!-- 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);
57 #include "gst_private.h"
59 #include "gstelement.h"
60 #include "gstelementmetadata.h"
63 #include "gstregistry.h"
66 #include "glib-compat-private.h"
68 GST_DEBUG_CATEGORY_STATIC (element_factory_debug);
69 #define GST_CAT_DEFAULT element_factory_debug
71 static void gst_element_factory_finalize (GObject * object);
72 static void gst_element_factory_cleanup (GstElementFactory * factory);
74 /* static guint gst_element_factory_signals[LAST_SIGNAL] = { 0 }; */
76 /* this is defined in gstelement.c */
77 extern GQuark __gst_elementclass_factory;
81 GST_DEBUG_CATEGORY_INIT (element_factory_debug, "GST_ELEMENT_FACTORY", \
82 GST_DEBUG_BOLD | GST_DEBUG_FG_WHITE | GST_DEBUG_BG_RED, \
83 "element factories keep information about installed elements"); \
86 G_DEFINE_TYPE_WITH_CODE (GstElementFactory, gst_element_factory,
87 GST_TYPE_PLUGIN_FEATURE, _do_init);
89 #ifdef TIZEN_PROFILE_TV
90 static GMutex pool_mutex;
91 static GList *pool = NULL;
95 gst_element_factory_class_init (GstElementFactoryClass * klass)
97 GObjectClass *gobject_class = (GObjectClass *) klass;
99 gobject_class->finalize = gst_element_factory_finalize;
103 gst_element_factory_init (GstElementFactory * factory)
105 factory->staticpadtemplates = NULL;
106 factory->numpadtemplates = 0;
108 factory->uri_type = GST_URI_UNKNOWN;
109 factory->uri_protocols = NULL;
111 factory->interfaces = NULL;
115 gst_element_factory_finalize (GObject * object)
117 GstElementFactory *factory = GST_ELEMENT_FACTORY (object);
119 gst_element_factory_cleanup (factory);
120 G_OBJECT_CLASS (gst_element_factory_parent_class)->finalize (object);
124 * gst_element_factory_find:
125 * @name: name of factory to find
127 * Search for an element factory of the given name. Refs the returned
128 * element factory; caller is responsible for unreffing.
130 * Returns: (transfer full) (nullable): #GstElementFactory if found,
134 gst_element_factory_find (const gchar * name)
136 GstPluginFeature *feature;
138 g_return_val_if_fail (name != NULL, NULL);
140 feature = gst_registry_find_feature (gst_registry_get (), name,
141 GST_TYPE_ELEMENT_FACTORY);
143 return GST_ELEMENT_FACTORY (feature);
145 /* this isn't an error, for instance when you query if an element factory is
147 GST_LOG ("no such element factory \"%s\"", name);
152 gst_element_factory_cleanup (GstElementFactory * factory)
156 if (factory->metadata) {
157 gst_structure_free ((GstStructure *) factory->metadata);
158 factory->metadata = NULL;
161 factory->type = G_TYPE_INVALID;
164 for (item = factory->staticpadtemplates; item; item = item->next) {
165 GstStaticPadTemplate *templ = item->data;
167 gst_static_caps_cleanup (&templ->static_caps);
168 g_slice_free (GstStaticPadTemplate, templ);
170 g_list_free (factory->staticpadtemplates);
171 factory->staticpadtemplates = NULL;
172 factory->numpadtemplates = 0;
173 factory->uri_type = GST_URI_UNKNOWN;
174 if (factory->uri_protocols) {
175 g_strfreev (factory->uri_protocols);
176 factory->uri_protocols = NULL;
179 g_list_free (factory->interfaces);
180 factory->interfaces = NULL;
183 #define CHECK_METADATA_FIELD(klass, name, key) \
185 const gchar *metafield = gst_element_class_get_metadata (klass, key); \
186 if (G_UNLIKELY (metafield == NULL || *metafield == '\0')) { \
187 g_warning ("Element factory metadata for '%s' has no valid %s field", name, key); \
193 * gst_element_register:
194 * @plugin: (allow-none): #GstPlugin to register the element with, or %NULL for
196 * @name: name of elements of this type
197 * @rank: rank of element (higher rank means more importance when autoplugging)
198 * @type: GType of element to register
200 * Create a new elementfactory capable of instantiating objects of the
201 * @type and add the factory to @plugin.
203 * Returns: %TRUE, if the registering succeeded, %FALSE on error
206 gst_element_register (GstPlugin * plugin, const gchar * name, guint rank,
209 GstPluginFeature *existing_feature;
210 GstRegistry *registry;
211 GstElementFactory *factory;
213 guint n_interfaces, i;
214 GstElementClass *klass;
217 g_return_val_if_fail (name != NULL, FALSE);
218 g_return_val_if_fail (g_type_is_a (type, GST_TYPE_ELEMENT), FALSE);
220 registry = gst_registry_get ();
222 /* check if feature already exists, if it exists there is no need to update it
223 * when the registry is getting updated, outdated plugins and all their
224 * features are removed and readded.
226 existing_feature = gst_registry_lookup_feature (registry, name);
227 if (existing_feature) {
228 GST_DEBUG_OBJECT (registry, "update existing feature %p (%s)",
229 existing_feature, name);
230 factory = GST_ELEMENT_FACTORY_CAST (existing_feature);
231 factory->type = type;
232 existing_feature->loaded = TRUE;
233 g_type_set_qdata (type, __gst_elementclass_factory, factory);
234 gst_object_unref (existing_feature);
238 factory = g_object_new (GST_TYPE_ELEMENT_FACTORY, NULL);
239 gst_plugin_feature_set_name (GST_PLUGIN_FEATURE_CAST (factory), name);
240 GST_LOG_OBJECT (factory, "Created new elementfactory for type %s",
243 /* provide info needed during class structure setup */
244 g_type_set_qdata (type, __gst_elementclass_factory, factory);
245 klass = GST_ELEMENT_CLASS (g_type_class_ref (type));
247 CHECK_METADATA_FIELD (klass, name, GST_ELEMENT_METADATA_LONGNAME);
248 CHECK_METADATA_FIELD (klass, name, GST_ELEMENT_METADATA_KLASS);
249 CHECK_METADATA_FIELD (klass, name, GST_ELEMENT_METADATA_DESCRIPTION);
250 CHECK_METADATA_FIELD (klass, name, GST_ELEMENT_METADATA_AUTHOR);
252 factory->type = type;
253 factory->metadata = gst_structure_copy ((GstStructure *) klass->metadata);
255 for (item = klass->padtemplates; item; item = item->next) {
256 GstPadTemplate *templ = item->data;
257 GstStaticPadTemplate *newt;
258 gchar *caps_string = gst_caps_to_string (templ->caps);
260 newt = g_slice_new (GstStaticPadTemplate);
261 newt->name_template = g_intern_string (templ->name_template);
262 newt->direction = templ->direction;
263 newt->presence = templ->presence;
264 newt->static_caps.caps = NULL;
265 newt->static_caps.string = g_intern_string (caps_string);
266 factory->staticpadtemplates =
267 g_list_append (factory->staticpadtemplates, newt);
269 g_free (caps_string);
271 factory->numpadtemplates = klass->numpadtemplates;
273 /* special stuff for URI handling */
274 if (g_type_is_a (type, GST_TYPE_URI_HANDLER)) {
275 GstURIHandlerInterface *iface = (GstURIHandlerInterface *)
276 g_type_interface_peek (klass, GST_TYPE_URI_HANDLER);
278 if (!iface || !iface->get_type || !iface->get_protocols)
281 factory->uri_type = iface->get_type (factory->type);
282 if (!GST_URI_TYPE_IS_VALID (factory->uri_type))
284 if (iface->get_protocols) {
285 const gchar *const *protocols;
287 protocols = iface->get_protocols (factory->type);
288 factory->uri_protocols = g_strdupv ((gchar **) protocols);
290 if (!factory->uri_protocols)
294 interfaces = g_type_interfaces (type, &n_interfaces);
295 for (i = 0; i < n_interfaces; i++) {
296 __gst_element_factory_add_interface (factory, g_type_name (interfaces[i]));
300 if (plugin && plugin->desc.name) {
301 GST_PLUGIN_FEATURE_CAST (factory)->plugin_name = plugin->desc.name;
302 GST_PLUGIN_FEATURE_CAST (factory)->plugin = plugin;
303 g_object_add_weak_pointer ((GObject *) plugin,
304 (gpointer *) & GST_PLUGIN_FEATURE_CAST (factory)->plugin);
306 GST_PLUGIN_FEATURE_CAST (factory)->plugin_name = "NULL";
307 GST_PLUGIN_FEATURE_CAST (factory)->plugin = NULL;
309 gst_plugin_feature_set_rank (GST_PLUGIN_FEATURE_CAST (factory), rank);
310 GST_PLUGIN_FEATURE_CAST (factory)->loaded = TRUE;
312 gst_registry_add_feature (registry, GST_PLUGIN_FEATURE_CAST (factory));
319 GST_WARNING_OBJECT (factory, "error with uri handler!");
320 gst_element_factory_cleanup (factory);
326 gst_element_factory_cleanup (factory);
332 * gst_element_factory_create:
333 * @factory: factory to instantiate
334 * @name: (allow-none): name of new element, or %NULL to automatically create
337 * Create a new element of the type defined by the given elementfactory.
338 * It will be given the name supplied, since all elements require a name as
339 * their first argument.
341 * Returns: (transfer floating) (nullable): new #GstElement or %NULL
342 * if the element couldn't be created
345 gst_element_factory_create (GstElementFactory * factory, const gchar * name)
348 GstElementClass *oclass;
349 GstElementFactory *newfactory;
351 g_return_val_if_fail (factory != NULL, NULL);
354 GST_ELEMENT_FACTORY (gst_plugin_feature_load (GST_PLUGIN_FEATURE
357 if (newfactory == NULL)
360 factory = newfactory;
363 GST_INFO ("creating element \"%s\" named \"%s\"",
364 GST_OBJECT_NAME (factory), GST_STR_NULL (name));
366 GST_INFO ("creating element \"%s\"", GST_OBJECT_NAME (factory));
368 if (factory->type == 0)
371 /* create an instance of the element, cast so we don't assert on NULL
372 * also set name as early as we can
375 element = g_object_new (factory->type, "name", name, NULL);
377 element = g_object_new (factory->type, NULL);
378 if (G_UNLIKELY (element == NULL))
381 /* fill in the pointer to the factory in the element class. The
382 * class will not be unreffed currently.
383 * Be thread safe as there might be 2 threads creating the first instance of
384 * an element at the same moment
386 oclass = GST_ELEMENT_GET_CLASS (element);
387 if (!g_atomic_pointer_compare_and_exchange (&oclass->elementfactory, NULL,
389 gst_object_unref (factory);
391 /* This ref will never be dropped as the class is never destroyed */
392 GST_OBJECT_FLAG_SET (factory, GST_OBJECT_FLAG_MAY_BE_LEAKED);
394 /* Ensure that the reference is floating. Bindings might have a hard time
395 * making sure that the reference is indeed still floating after returning
398 g_object_force_floating ((GObject *) element);
400 GST_DEBUG ("created element \"%s\"", GST_OBJECT_NAME (factory));
407 GST_WARNING_OBJECT (factory,
408 "loading plugin containing feature %s returned NULL!", name);
413 GST_WARNING_OBJECT (factory, "factory has no type");
414 gst_object_unref (factory);
419 GST_WARNING_OBJECT (factory, "could not create element");
420 gst_object_unref (factory);
426 * gst_element_factory_make:
427 * @factoryname: a named factory to instantiate
428 * @name: (allow-none): name of new element, or %NULL to automatically create
431 * Create a new element of the type defined by the given element factory.
432 * If name is %NULL, then the element will receive a guaranteed unique name,
433 * consisting of the element factory name and a number.
434 * If name is given, it will be given the name supplied.
436 * Returns: (transfer floating) (nullable): new #GstElement or %NULL
437 * if unable to create element
440 gst_element_factory_make (const gchar * factoryname, const gchar * name)
442 GstElementFactory *factory;
445 g_return_val_if_fail (factoryname != NULL, NULL);
446 g_return_val_if_fail (gst_is_initialized (), NULL);
448 GST_LOG ("gstelementfactory: make \"%s\" \"%s\"",
449 factoryname, GST_STR_NULL (name));
451 factory = gst_element_factory_find (factoryname);
455 GST_LOG_OBJECT (factory, "found factory %p", factory);
456 element = gst_element_factory_create (factory, name);
460 gst_object_unref (factory);
467 GST_WARNING ("no such element factory \"%s\"!", factoryname);
472 GST_INFO_OBJECT (factory, "couldn't create instance!");
473 gst_object_unref (factory);
479 __gst_element_factory_add_static_pad_template (GstElementFactory * factory,
480 GstStaticPadTemplate * templ)
482 g_return_if_fail (factory != NULL);
483 g_return_if_fail (templ != NULL);
485 factory->staticpadtemplates =
486 g_list_append (factory->staticpadtemplates, templ);
487 factory->numpadtemplates++;
491 * gst_element_factory_get_element_type:
492 * @factory: factory to get managed #GType from
494 * Get the #GType for elements managed by this factory. The type can
495 * only be retrieved if the element factory is loaded, which can be
496 * assured with gst_plugin_feature_load().
498 * Returns: the #GType for elements managed by this factory or 0 if
499 * the factory is not loaded.
502 gst_element_factory_get_element_type (GstElementFactory * factory)
504 g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), 0);
506 return factory->type;
510 * gst_element_factory_get_metadata:
511 * @factory: a #GstElementFactory
514 * Get the metadata on @factory with @key.
516 * Returns: (nullable): the metadata with @key on @factory or %NULL
517 * when there was no metadata with the given @key.
520 gst_element_factory_get_metadata (GstElementFactory * factory,
523 g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), NULL);
525 return gst_structure_get_string ((GstStructure *) factory->metadata, key);
529 * gst_element_factory_get_metadata_keys:
530 * @factory: a #GstElementFactory
532 * Get the available keys for the metadata on @factory.
534 * Returns: (transfer full) (element-type utf8) (array zero-terminated=1) (nullable):
535 * a %NULL-terminated array of key strings, or %NULL when there is no
536 * metadata. Free with g_strfreev() when no longer needed.
539 gst_element_factory_get_metadata_keys (GstElementFactory * factory)
541 GstStructure *metadata;
545 g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), NULL);
547 metadata = (GstStructure *) factory->metadata;
548 if (metadata == NULL)
551 num = gst_structure_n_fields (metadata);
555 arr = g_new (gchar *, num + 1);
556 for (i = 0; i < num; ++i) {
557 arr[i] = g_strdup (gst_structure_nth_field_name (metadata, i));
564 * gst_element_factory_get_num_pad_templates:
565 * @factory: a #GstElementFactory
567 * Gets the number of pad_templates in this factory.
569 * Returns: the number of pad_templates
572 gst_element_factory_get_num_pad_templates (GstElementFactory * factory)
574 g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), 0);
576 return factory->numpadtemplates;
580 * __gst_element_factory_add_interface:
581 * @elementfactory: The elementfactory to add the interface to
582 * @interfacename: Name of the interface
584 * Adds the given interfacename to the list of implemented interfaces of the
588 __gst_element_factory_add_interface (GstElementFactory * elementfactory,
589 const gchar * interfacename)
591 g_return_if_fail (GST_IS_ELEMENT_FACTORY (elementfactory));
592 g_return_if_fail (interfacename != NULL);
593 g_return_if_fail (interfacename[0] != '\0'); /* no empty string */
595 elementfactory->interfaces =
596 g_list_prepend (elementfactory->interfaces,
597 (gpointer) g_intern_string (interfacename));
601 * gst_element_factory_get_static_pad_templates:
602 * @factory: a #GstElementFactory
604 * Gets the #GList of #GstStaticPadTemplate for this factory.
606 * Returns: (transfer none) (element-type Gst.StaticPadTemplate): the
607 * static pad templates
610 gst_element_factory_get_static_pad_templates (GstElementFactory * factory)
612 g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), NULL);
614 return factory->staticpadtemplates;
618 * gst_element_factory_get_uri_type:
619 * @factory: a #GstElementFactory
621 * Gets the type of URIs the element supports or #GST_URI_UNKNOWN if none.
623 * Returns: type of URIs this element supports
626 gst_element_factory_get_uri_type (GstElementFactory * factory)
628 g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), GST_URI_UNKNOWN);
630 return factory->uri_type;
634 * gst_element_factory_get_uri_protocols:
635 * @factory: a #GstElementFactory
637 * Gets a %NULL-terminated array of protocols this element supports or %NULL if
638 * no protocols are supported. You may not change the contents of the returned
639 * array, as it is still owned by the element factory. Use g_strdupv() to
640 * make a copy of the protocol string array if you need to.
642 * Returns: (transfer none) (array zero-terminated=1): the supported protocols
646 gst_element_factory_get_uri_protocols (GstElementFactory * factory)
648 g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), NULL);
650 return (const gchar * const *) factory->uri_protocols;
654 * gst_element_factory_has_interface:
655 * @factory: a #GstElementFactory
656 * @interfacename: an interface name
658 * Check if @factory implements the interface with name @interfacename.
660 * Returns: %TRUE when @factory implement the interface.
663 gst_element_factory_has_interface (GstElementFactory * factory,
664 const gchar * interfacename)
668 g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), FALSE);
670 for (walk = factory->interfaces; walk; walk = g_list_next (walk)) {
671 gchar *iname = (gchar *) walk->data;
673 if (!strcmp (iname, interfacename))
682 GstElementFactoryListType type;
688 * gst_element_factory_list_is_type:
689 * @factory: a #GstElementFactory
690 * @type: a #GstElementFactoryListType
692 * Check if @factory is of the given types.
694 * Returns: %TRUE if @factory is of @type.
697 gst_element_factory_list_is_type (GstElementFactory * factory,
698 GstElementFactoryListType type)
700 gboolean res = FALSE;
704 gst_element_factory_get_metadata (factory, GST_ELEMENT_METADATA_KLASS);
707 GST_ERROR_OBJECT (factory, "element factory is missing klass identifiers");
711 /* Filter by element type first, as soon as it matches
712 * one type, we skip all other tests */
713 if (!res && (type & GST_ELEMENT_FACTORY_TYPE_SINK))
714 res = (strstr (klass, "Sink") != NULL);
716 if (!res && (type & GST_ELEMENT_FACTORY_TYPE_SRC))
717 res = (strstr (klass, "Source") != NULL);
719 if (!res && (type & GST_ELEMENT_FACTORY_TYPE_DECODER))
720 res = (strstr (klass, "Decoder") != NULL);
722 if (!res && (type & GST_ELEMENT_FACTORY_TYPE_ENCODER))
723 res = (strstr (klass, "Encoder") != NULL);
725 if (!res && (type & GST_ELEMENT_FACTORY_TYPE_MUXER))
726 res = (strstr (klass, "Muxer") != NULL);
728 if (!res && (type & GST_ELEMENT_FACTORY_TYPE_DEMUXER))
729 res = (strstr (klass, "Demux") != NULL);
731 /* FIXME : We're actually parsing two Classes here... */
732 if (!res && (type & GST_ELEMENT_FACTORY_TYPE_PARSER))
733 res = ((strstr (klass, "Parser") != NULL)
734 && (strstr (klass, "Codec") != NULL));
736 if (!res && (type & GST_ELEMENT_FACTORY_TYPE_DEPAYLOADER))
737 res = (strstr (klass, "Depayloader") != NULL);
739 if (!res && (type & GST_ELEMENT_FACTORY_TYPE_PAYLOADER))
740 res = (strstr (klass, "Payloader") != NULL);
742 if (!res && (type & GST_ELEMENT_FACTORY_TYPE_FORMATTER))
743 res = (strstr (klass, "Formatter") != NULL);
745 if (!res && (type & GST_ELEMENT_FACTORY_TYPE_DECRYPTOR))
746 res = (strstr (klass, "Decryptor") != NULL);
748 if (!res && (type & GST_ELEMENT_FACTORY_TYPE_ENCRYPTOR))
749 res = (strstr (klass, "Encryptor") != NULL);
751 /* Filter by media type now, we only test if it
752 * matched any of the types above or only checking the media
753 * type was requested. */
754 if ((res || !(type & (GST_ELEMENT_FACTORY_TYPE_MAX_ELEMENTS - 1)))
755 && (type & (GST_ELEMENT_FACTORY_TYPE_MEDIA_AUDIO |
756 GST_ELEMENT_FACTORY_TYPE_MEDIA_VIDEO |
757 GST_ELEMENT_FACTORY_TYPE_MEDIA_IMAGE |
758 GST_ELEMENT_FACTORY_TYPE_MEDIA_SUBTITLE |
759 GST_ELEMENT_FACTORY_TYPE_MEDIA_METADATA)))
760 res = ((type & GST_ELEMENT_FACTORY_TYPE_MEDIA_AUDIO)
761 && (strstr (klass, "Audio") != NULL))
762 || ((type & GST_ELEMENT_FACTORY_TYPE_MEDIA_VIDEO)
763 && (strstr (klass, "Video") != NULL))
764 || ((type & GST_ELEMENT_FACTORY_TYPE_MEDIA_IMAGE)
765 && (strstr (klass, "Image") != NULL)) ||
766 ((type & GST_ELEMENT_FACTORY_TYPE_MEDIA_SUBTITLE)
767 && (strstr (klass, "Subtitle") != NULL)) ||
768 ((type & GST_ELEMENT_FACTORY_TYPE_MEDIA_METADATA)
769 && (strstr (klass, "Metadata") != NULL));
775 element_filter (GstPluginFeature * feature, FilterData * data)
779 /* we only care about element factories */
780 if (G_UNLIKELY (!GST_IS_ELEMENT_FACTORY (feature)))
783 res = (gst_plugin_feature_get_rank (feature) >= data->minrank) &&
784 gst_element_factory_list_is_type (GST_ELEMENT_FACTORY_CAST (feature),
791 * gst_element_factory_list_get_elements:
792 * @type: a #GstElementFactoryListType
793 * @minrank: Minimum rank
795 * Get a list of factories that match the given @type. Only elements
796 * with a rank greater or equal to @minrank will be returned.
797 * The list of factories is returned by decreasing rank.
799 * Returns: (transfer full) (element-type Gst.ElementFactory): a #GList of
800 * #GstElementFactory elements. Use gst_plugin_feature_list_free() after
804 gst_element_factory_list_get_elements (GstElementFactoryListType type,
812 data.minrank = minrank;
814 /* get the feature list using the filter */
815 result = gst_registry_feature_filter (gst_registry_get (),
816 (GstPluginFeatureFilter) element_filter, FALSE, &data);
818 /* sort on rank and name */
819 result = g_list_sort (result, gst_plugin_feature_rank_compare_func);
825 * gst_element_factory_list_filter:
826 * @list: (transfer none) (element-type Gst.ElementFactory): a #GList of
827 * #GstElementFactory to filter
829 * @direction: a #GstPadDirection to filter on
830 * @subsetonly: whether to filter on caps subsets or not.
832 * Filter out all the elementfactories in @list that can handle @caps in
833 * the given direction.
835 * If @subsetonly is %TRUE, then only the elements whose pads templates
836 * are a complete superset of @caps will be returned. Else any element
837 * whose pad templates caps can intersect with @caps will be returned.
839 * Returns: (transfer full) (element-type Gst.ElementFactory): a #GList of
840 * #GstElementFactory elements that match the given requisites.
841 * Use #gst_plugin_feature_list_free after usage.
844 gst_element_factory_list_filter (GList * list,
845 const GstCaps * caps, GstPadDirection direction, gboolean subsetonly)
847 GQueue results = G_QUEUE_INIT;
849 GST_DEBUG ("finding factories");
851 /* loop over all the factories */
852 for (; list; list = list->next) {
853 GstElementFactory *factory;
854 const GList *templates;
857 factory = (GstElementFactory *) list->data;
859 GST_DEBUG ("Trying %s",
860 gst_plugin_feature_get_name ((GstPluginFeature *) factory));
862 /* get the templates from the element factory */
863 templates = gst_element_factory_get_static_pad_templates (factory);
864 for (walk = (GList *) templates; walk; walk = g_list_next (walk)) {
865 GstStaticPadTemplate *templ = walk->data;
867 /* we only care about the sink templates */
868 if (templ->direction == direction) {
871 /* try to intersect the caps with the caps of the template */
872 tmpl_caps = gst_static_caps_get (&templ->static_caps);
874 /* FIXME, intersect is not the right method, we ideally want to check
875 * for a subset here */
877 /* check if the intersection is empty */
878 if ((subsetonly && gst_caps_is_subset (caps, tmpl_caps)) ||
879 (!subsetonly && gst_caps_can_intersect (caps, tmpl_caps))) {
880 /* non empty intersection, we can use this element */
881 g_queue_push_tail (&results, gst_object_ref (factory));
882 gst_caps_unref (tmpl_caps);
885 gst_caps_unref (tmpl_caps);
892 #ifdef TIZEN_PROFILE_TV
894 * gst_element_factory_pool_push:
896 * Pushes the element to the pool. This function increase the refcount of @element.
897 * And the pool will take a reference forever.
901 gst_element_factory_pool_push (GstElement * element)
903 gboolean ret = FALSE;
904 g_return_val_if_fail (element != NULL, FALSE);
905 g_return_val_if_fail (GST_IS_ELEMENT (element) == TRUE, FALSE);
906 g_return_val_if_fail (GST_IS_BIN (element) == FALSE, FALSE);
907 g_return_val_if_fail (GST_IS_PIPELINE (element) == FALSE, FALSE);
909 g_mutex_lock (&pool_mutex);
910 if (!g_list_find (pool, (gconstpointer) element)) {
911 gst_object_ref (element);
912 pool = g_list_prepend (pool, element);
915 //GST_INFO("ret[ %d ], [ %s / %p ] - refcount[ %d ], state[ %d ]", ret, GST_ELEMENT_NAME(element), element, GST_OBJECT_REFCOUNT(element), GST_STATE (element));
916 g_mutex_unlock (&pool_mutex);
921 is_available_element (gconstpointer data, gconstpointer factory_)
923 GstElement *element = GST_ELEMENT_CAST (data);
924 const GstElementFactory *factory = (const GstElementFactory *) factory_;
925 gboolean found = FALSE;
926 if (gst_element_get_factory (element) == factory
927 && GST_ELEMENT_PARENT (element) == NULL
928 && GST_OBJECT_REFCOUNT (element) == 1
929 && (GST_STATE (element) == GST_STATE_NULL
930 || GST_STATE (element) == GST_STATE_VOID_PENDING)) {
933 //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));
942 * gst_element_factory_pool_get:
944 * Get a element which is created by given @factoryname
945 * You can search any element by this API before you use gst_element_factory_create.
946 * Returns: (transfer full): a pointer to the #GstElement.
947 * This function guarantee that the refcount of returned #GstElement is 1,
948 * and it's state is NULL-STATE.
953 gst_element_factory_pool_get (GstElementFactory * factory,
954 const gchar * new_element_name)
956 GstElement *element = NULL;
958 g_return_val_if_fail (factory != NULL, NULL);
959 g_return_val_if_fail (pool != NULL, NULL);
961 g_mutex_lock (&pool_mutex);
962 found = g_list_find_custom (pool, factory, is_available_element);
964 element = GST_ELEMENT_CAST (found->data);
965 gst_object_ref (element);
966 if (new_element_name)
967 gst_element_set_name (element, new_element_name);
969 g_mutex_unlock (&pool_mutex);
973 /* First, Try to get element from pool. */
975 gst_element_factory_get (GstElementFactory * factory, const gchar * name)
977 GstElement *element = NULL;
978 g_return_val_if_fail (factory != NULL, NULL);
979 element = gst_element_factory_pool_get (factory, name);
981 element = gst_element_factory_create (factory, name);
983 GST_ERROR ("[ %s / %p ], new element name[ %s ]",
984 GST_OBJECT_NAME (factory), factory, name);
987 gst_element_factory_pool_push (element);
989 gst_set_family_id_to_child (element, 0);
992 //GST_INFO("[ %s / %p ] - refcount[ %d ], state[ %d ]", GST_ELEMENT_NAME(element), element, GST_OBJECT_REFCOUNT(element), GST_STATE (element));