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819 lines
24 KiB
C
819 lines
24 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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* 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
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*
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* gstelementfactory.c: GstElementFactory object, support routines
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:gstelementfactory
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* @short_description: Create GstElements from a factory
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* @see_also: #GstElement, #GstPlugin, #GstPluginFeature, #GstPadTemplate.
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*
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* #GstElementFactory is used to create instances of elements. A
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* GstElementfactory can be added to a #GstPlugin as it is also a
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* #GstPluginFeature.
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*
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* Use the gst_element_factory_find() and gst_element_factory_create()
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* functions to create element instances or use gst_element_factory_make() as a
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* convenient shortcut.
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*
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* The following code example shows you how to create a GstFileSrc element.
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*
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* <example>
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* <title>Using an element factory</title>
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* <programlisting language="c">
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* #include <gst/gst.h>
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*
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* GstElement *src;
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* GstElementFactory *srcfactory;
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*
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* gst_init (&argc, &argv);
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*
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* srcfactory = gst_element_factory_find ("filesrc");
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* g_return_if_fail (srcfactory != NULL);
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* src = gst_element_factory_create (srcfactory, "src");
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* g_return_if_fail (src != NULL);
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* ...
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* </programlisting>
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* </example>
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*
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* Last reviewed on 2005-11-23 (0.9.5)
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*/
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#include "gst_private.h"
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#include "gstelement.h"
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#include "gstelementmetadata.h"
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#include "gstinfo.h"
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#include "gsturi.h"
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#include "gstregistry.h"
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#include "gst.h"
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#include "glib-compat-private.h"
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GST_DEBUG_CATEGORY_STATIC (element_factory_debug);
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#define GST_CAT_DEFAULT element_factory_debug
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static void gst_element_factory_finalize (GObject * object);
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static void gst_element_factory_cleanup (GstElementFactory * factory);
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/* static guint gst_element_factory_signals[LAST_SIGNAL] = { 0 }; */
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/* this is defined in gstelement.c */
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extern GQuark __gst_elementclass_factory;
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#define _do_init \
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{ \
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GST_DEBUG_CATEGORY_INIT (element_factory_debug, "GST_ELEMENT_FACTORY", \
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GST_DEBUG_BOLD | GST_DEBUG_FG_WHITE | GST_DEBUG_BG_RED, \
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"element factories keep information about installed elements"); \
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}
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G_DEFINE_TYPE_WITH_CODE (GstElementFactory, gst_element_factory,
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GST_TYPE_PLUGIN_FEATURE, _do_init);
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static void
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gst_element_factory_class_init (GstElementFactoryClass * klass)
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{
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GObjectClass *gobject_class = (GObjectClass *) klass;
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gobject_class->finalize = gst_element_factory_finalize;
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}
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static void
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gst_element_factory_init (GstElementFactory * factory)
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{
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factory->staticpadtemplates = NULL;
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factory->numpadtemplates = 0;
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factory->uri_type = GST_URI_UNKNOWN;
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factory->uri_protocols = NULL;
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factory->interfaces = NULL;
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}
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static void
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gst_element_factory_finalize (GObject * object)
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{
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GstElementFactory *factory = GST_ELEMENT_FACTORY (object);
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gst_element_factory_cleanup (factory);
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G_OBJECT_CLASS (gst_element_factory_parent_class)->finalize (object);
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}
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/**
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* gst_element_factory_find:
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* @name: name of factory to find
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*
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* Search for an element factory of the given name. Refs the returned
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* element factory; caller is responsible for unreffing.
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*
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* Returns: (transfer full): #GstElementFactory if found, NULL otherwise
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*/
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GstElementFactory *
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gst_element_factory_find (const gchar * name)
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{
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GstPluginFeature *feature;
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g_return_val_if_fail (name != NULL, NULL);
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feature = gst_registry_find_feature (gst_registry_get_default (), name,
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GST_TYPE_ELEMENT_FACTORY);
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if (feature)
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return GST_ELEMENT_FACTORY (feature);
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/* this isn't an error, for instance when you query if an element factory is
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* present */
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GST_LOG ("no such element factory \"%s\"", name);
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return NULL;
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}
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static void
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gst_element_factory_cleanup (GstElementFactory * factory)
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{
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GList *item;
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if (factory->metadata) {
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gst_structure_free ((GstStructure *) factory->metadata);
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factory->metadata = NULL;
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}
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if (factory->type) {
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factory->type = G_TYPE_INVALID;
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}
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for (item = factory->staticpadtemplates; item; item = item->next) {
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GstStaticPadTemplate *templ = item->data;
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gst_static_caps_cleanup (&templ->static_caps);
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g_slice_free (GstStaticPadTemplate, templ);
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}
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g_list_free (factory->staticpadtemplates);
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factory->staticpadtemplates = NULL;
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factory->numpadtemplates = 0;
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factory->uri_type = GST_URI_UNKNOWN;
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if (factory->uri_protocols) {
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g_strfreev (factory->uri_protocols);
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factory->uri_protocols = NULL;
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}
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g_list_free (factory->interfaces);
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factory->interfaces = NULL;
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}
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/**
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* gst_element_register:
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* @plugin: (allow-none): #GstPlugin to register the element with, or NULL for
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* a static element (note that passing NULL only works in GStreamer 0.10.13
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* and later)
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* @name: name of elements of this type
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* @rank: rank of element (higher rank means more importance when autoplugging)
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* @type: GType of element to register
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*
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* Create a new elementfactory capable of instantiating objects of the
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* @type and add the factory to @plugin.
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*
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* Returns: TRUE, if the registering succeeded, FALSE on error
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*/
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gboolean
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gst_element_register (GstPlugin * plugin, const gchar * name, guint rank,
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GType type)
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{
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GstPluginFeature *existing_feature;
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GstRegistry *registry;
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GstElementFactory *factory;
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GType *interfaces;
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guint n_interfaces, i;
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GstElementClass *klass;
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GList *item;
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g_return_val_if_fail (name != NULL, FALSE);
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g_return_val_if_fail (g_type_is_a (type, GST_TYPE_ELEMENT), FALSE);
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registry = gst_registry_get_default ();
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/* check if feature already exists, if it exists there is no need to update it
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* when the registry is getting updated, outdated plugins and all their
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* features are removed and readded.
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*/
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existing_feature = gst_registry_lookup_feature (registry, name);
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if (existing_feature) {
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GST_DEBUG_OBJECT (registry, "update existing feature %p (%s)",
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existing_feature, name);
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factory = GST_ELEMENT_FACTORY_CAST (existing_feature);
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factory->type = type;
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existing_feature->loaded = TRUE;
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g_type_set_qdata (type, __gst_elementclass_factory, factory);
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gst_object_unref (existing_feature);
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return TRUE;
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}
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factory =
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GST_ELEMENT_FACTORY_CAST (g_object_newv (GST_TYPE_ELEMENT_FACTORY, 0,
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NULL));
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gst_plugin_feature_set_name (GST_PLUGIN_FEATURE_CAST (factory), name);
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GST_LOG_OBJECT (factory, "Created new elementfactory for type %s",
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g_type_name (type));
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/* provide info needed during class structure setup */
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g_type_set_qdata (type, __gst_elementclass_factory, factory);
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klass = GST_ELEMENT_CLASS (g_type_class_ref (type));
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#if 0
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/* FIXME */
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if ((klass->details.longname == NULL) ||
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(klass->details.klass == NULL) || (klass->details.author == NULL))
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goto detailserror;
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#endif
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factory->type = type;
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factory->metadata = gst_structure_copy ((GstStructure *) klass->metadata);
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for (item = klass->padtemplates; item; item = item->next) {
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GstPadTemplate *templ = item->data;
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GstStaticPadTemplate *newt;
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gchar *caps_string = gst_caps_to_string (templ->caps);
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newt = g_slice_new (GstStaticPadTemplate);
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newt->name_template = g_intern_string (templ->name_template);
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newt->direction = templ->direction;
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newt->presence = templ->presence;
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newt->static_caps.caps.mini_object.refcount = 0;
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newt->static_caps.string = g_intern_string (caps_string);
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factory->staticpadtemplates =
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g_list_append (factory->staticpadtemplates, newt);
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g_free (caps_string);
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}
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factory->numpadtemplates = klass->numpadtemplates;
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/* special stuff for URI handling */
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if (g_type_is_a (type, GST_TYPE_URI_HANDLER)) {
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GstURIHandlerInterface *iface = (GstURIHandlerInterface *)
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g_type_interface_peek (klass, GST_TYPE_URI_HANDLER);
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if (!iface || !iface->get_type || !iface->get_protocols)
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goto urierror;
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if (iface->get_type)
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factory->uri_type = iface->get_type (factory->type);
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if (!GST_URI_TYPE_IS_VALID (factory->uri_type))
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goto urierror;
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if (iface->get_protocols) {
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const gchar *const *protocols;
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protocols = iface->get_protocols (factory->type);
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factory->uri_protocols = g_strdupv ((gchar **) protocols);
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}
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if (!factory->uri_protocols)
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goto urierror;
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}
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interfaces = g_type_interfaces (type, &n_interfaces);
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for (i = 0; i < n_interfaces; i++) {
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__gst_element_factory_add_interface (factory, g_type_name (interfaces[i]));
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}
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g_free (interfaces);
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if (plugin && plugin->desc.name) {
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GST_PLUGIN_FEATURE_CAST (factory)->plugin_name = plugin->desc.name;
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GST_PLUGIN_FEATURE_CAST (factory)->plugin = plugin;
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g_object_add_weak_pointer ((GObject *) plugin,
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(gpointer *) & GST_PLUGIN_FEATURE_CAST (factory)->plugin);
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} else {
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GST_PLUGIN_FEATURE_CAST (factory)->plugin_name = "NULL";
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GST_PLUGIN_FEATURE_CAST (factory)->plugin = NULL;
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}
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gst_plugin_feature_set_rank (GST_PLUGIN_FEATURE_CAST (factory), rank);
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GST_PLUGIN_FEATURE_CAST (factory)->loaded = TRUE;
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gst_registry_add_feature (registry, GST_PLUGIN_FEATURE_CAST (factory));
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return TRUE;
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/* ERRORS */
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urierror:
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{
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GST_WARNING_OBJECT (factory, "error with uri handler!");
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gst_element_factory_cleanup (factory);
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return FALSE;
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}
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#if 0
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detailserror:
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{
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GST_WARNING_OBJECT (factory,
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"The GstElementDetails don't seem to have been set properly");
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gst_element_factory_cleanup (factory);
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return FALSE;
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}
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#endif
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}
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/**
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* gst_element_factory_create:
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* @factory: factory to instantiate
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* @name: (allow-none): name of new element, or NULL to automatically create
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* a unique name
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*
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* Create a new element of the type defined by the given elementfactory.
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* It will be given the name supplied, since all elements require a name as
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* their first argument.
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*
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* Returns: (transfer full): new #GstElement or NULL if the element couldn't
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* be created
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*/
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GstElement *
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gst_element_factory_create (GstElementFactory * factory, const gchar * name)
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{
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GstElement *element;
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GstElementClass *oclass;
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GstElementFactory *newfactory;
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g_return_val_if_fail (factory != NULL, NULL);
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newfactory =
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GST_ELEMENT_FACTORY (gst_plugin_feature_load (GST_PLUGIN_FEATURE
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(factory)));
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if (newfactory == NULL)
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goto load_failed;
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factory = newfactory;
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if (name)
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GST_INFO ("creating element \"%s\" named \"%s\"",
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GST_OBJECT_NAME (factory), GST_STR_NULL (name));
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else
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GST_INFO ("creating element \"%s\"", GST_OBJECT_NAME (factory));
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if (factory->type == 0)
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goto no_type;
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/* create an instance of the element, cast so we don't assert on NULL
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* also set name as early as we can
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*/
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if (name)
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element =
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GST_ELEMENT_CAST (g_object_new (factory->type, "name", name, NULL));
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else
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element = GST_ELEMENT_CAST (g_object_newv (factory->type, 0, NULL));
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if (G_UNLIKELY (element == NULL))
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goto no_element;
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|
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/* fill in the pointer to the factory in the element class. The
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* class will not be unreffed currently.
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* Be thread safe as there might be 2 threads creating the first instance of
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* an element at the same moment
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*/
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oclass = GST_ELEMENT_GET_CLASS (element);
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if (!G_ATOMIC_POINTER_COMPARE_AND_EXCHANGE (&oclass->elementfactory, NULL,
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factory))
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gst_object_unref (factory);
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|
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GST_DEBUG ("created element \"%s\"", GST_OBJECT_NAME (factory));
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return element;
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|
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/* ERRORS */
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load_failed:
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{
|
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GST_WARNING_OBJECT (factory,
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"loading plugin containing feature %s returned NULL!", name);
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return NULL;
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}
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no_type:
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{
|
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GST_WARNING_OBJECT (factory, "factory has no type");
|
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gst_object_unref (factory);
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return NULL;
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}
|
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no_element:
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{
|
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GST_WARNING_OBJECT (factory, "could not create element");
|
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gst_object_unref (factory);
|
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return NULL;
|
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}
|
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}
|
|
|
|
/**
|
|
* gst_element_factory_make:
|
|
* @factoryname: a named factory to instantiate
|
|
* @name: (allow-none): name of new element, or NULL to automatically create
|
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* a unique name
|
|
*
|
|
* Create a new element of the type defined by the given element factory.
|
|
* If name is NULL, then the element will receive a guaranteed unique name,
|
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* consisting of the element factory name and a number.
|
|
* If name is given, it will be given the name supplied.
|
|
*
|
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* Returns: (transfer full): new #GstElement or NULL if unable to create element
|
|
*/
|
|
GstElement *
|
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gst_element_factory_make (const gchar * factoryname, const gchar * name)
|
|
{
|
|
GstElementFactory *factory;
|
|
GstElement *element;
|
|
|
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g_return_val_if_fail (factoryname != NULL, NULL);
|
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g_return_val_if_fail (gst_is_initialized (), NULL);
|
|
|
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GST_LOG ("gstelementfactory: make \"%s\" \"%s\"",
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factoryname, GST_STR_NULL (name));
|
|
|
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factory = gst_element_factory_find (factoryname);
|
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if (factory == NULL)
|
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goto no_factory;
|
|
|
|
GST_LOG_OBJECT (factory, "found factory %p", factory);
|
|
element = gst_element_factory_create (factory, name);
|
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if (element == NULL)
|
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goto create_failed;
|
|
|
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gst_object_unref (factory);
|
|
return element;
|
|
|
|
/* ERRORS */
|
|
no_factory:
|
|
{
|
|
GST_INFO ("no such element factory \"%s\"!", factoryname);
|
|
return NULL;
|
|
}
|
|
create_failed:
|
|
{
|
|
GST_INFO_OBJECT (factory, "couldn't create instance!");
|
|
gst_object_unref (factory);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
void
|
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__gst_element_factory_add_static_pad_template (GstElementFactory * factory,
|
|
GstStaticPadTemplate * templ)
|
|
{
|
|
g_return_if_fail (factory != NULL);
|
|
g_return_if_fail (templ != NULL);
|
|
|
|
factory->staticpadtemplates =
|
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g_list_append (factory->staticpadtemplates, templ);
|
|
factory->numpadtemplates++;
|
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}
|
|
|
|
/**
|
|
* gst_element_factory_get_element_type:
|
|
* @factory: factory to get managed #GType from
|
|
*
|
|
* Get the #GType for elements managed by this factory. The type can
|
|
* only be retrieved if the element factory is loaded, which can be
|
|
* assured with gst_plugin_feature_load().
|
|
*
|
|
* Returns: the #GType for elements managed by this factory or 0 if
|
|
* the factory is not loaded.
|
|
*/
|
|
GType
|
|
gst_element_factory_get_element_type (GstElementFactory * factory)
|
|
{
|
|
g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), 0);
|
|
|
|
return factory->type;
|
|
}
|
|
|
|
const gchar *
|
|
gst_element_factory_get_metadata (GstElementFactory * factory,
|
|
const gchar * key)
|
|
{
|
|
return gst_structure_get_string ((GstStructure *) factory->metadata, key);
|
|
}
|
|
|
|
/**
|
|
* gst_element_factory_get_num_pad_templates:
|
|
* @factory: a #GstElementFactory
|
|
*
|
|
* Gets the number of pad_templates in this factory.
|
|
*
|
|
* Returns: the number of pad_templates
|
|
*/
|
|
guint
|
|
gst_element_factory_get_num_pad_templates (GstElementFactory * factory)
|
|
{
|
|
g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), 0);
|
|
|
|
return factory->numpadtemplates;
|
|
}
|
|
|
|
/**
|
|
* __gst_element_factory_add_interface:
|
|
* @elementfactory: The elementfactory to add the interface to
|
|
* @interfacename: Name of the interface
|
|
*
|
|
* Adds the given interfacename to the list of implemented interfaces of the
|
|
* element.
|
|
*/
|
|
void
|
|
__gst_element_factory_add_interface (GstElementFactory * elementfactory,
|
|
const gchar * interfacename)
|
|
{
|
|
g_return_if_fail (GST_IS_ELEMENT_FACTORY (elementfactory));
|
|
g_return_if_fail (interfacename != NULL);
|
|
g_return_if_fail (interfacename[0] != '\0'); /* no empty string */
|
|
|
|
elementfactory->interfaces =
|
|
g_list_prepend (elementfactory->interfaces,
|
|
(gpointer) g_intern_string (interfacename));
|
|
}
|
|
|
|
/**
|
|
* gst_element_factory_get_static_pad_templates:
|
|
* @factory: a #GstElementFactory
|
|
*
|
|
* Gets the #GList of #GstStaticPadTemplate for this factory.
|
|
*
|
|
* Returns: (transfer none) (element-type Gst.StaticPadTemplate): the
|
|
* static pad templates
|
|
*/
|
|
const GList *
|
|
gst_element_factory_get_static_pad_templates (GstElementFactory * factory)
|
|
{
|
|
g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), NULL);
|
|
|
|
return factory->staticpadtemplates;
|
|
}
|
|
|
|
/**
|
|
* gst_element_factory_get_uri_type:
|
|
* @factory: a #GstElementFactory
|
|
*
|
|
* Gets the type of URIs the element supports or #GST_URI_UNKNOWN if none.
|
|
*
|
|
* Returns: type of URIs this element supports
|
|
*/
|
|
GstURIType
|
|
gst_element_factory_get_uri_type (GstElementFactory * factory)
|
|
{
|
|
g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), GST_URI_UNKNOWN);
|
|
|
|
return factory->uri_type;
|
|
}
|
|
|
|
/**
|
|
* gst_element_factory_get_uri_protocols:
|
|
* @factory: a #GstElementFactory
|
|
*
|
|
* Gets a NULL-terminated array of protocols this element supports or NULL if
|
|
* no protocols are supported. You may not change the contents of the returned
|
|
* array, as it is still owned by the element factory. Use g_strdupv() to
|
|
* make a copy of the protocol string array if you need to.
|
|
*
|
|
* Returns: (transfer none) (array zero-terminated=1): the supported protocols
|
|
* or NULL
|
|
*/
|
|
const gchar *const *
|
|
gst_element_factory_get_uri_protocols (GstElementFactory * factory)
|
|
{
|
|
g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), NULL);
|
|
|
|
return (const gchar * const *) factory->uri_protocols;
|
|
}
|
|
|
|
/**
|
|
* gst_element_factory_has_interface:
|
|
* @factory: a #GstElementFactory
|
|
* @interfacename: an interface name
|
|
*
|
|
* Check if @factory implements the interface with name @interfacename.
|
|
*
|
|
* Returns: #TRUE when @factory implement the interface.
|
|
*
|
|
* Since: 0.10.14
|
|
*/
|
|
gboolean
|
|
gst_element_factory_has_interface (GstElementFactory * factory,
|
|
const gchar * interfacename)
|
|
{
|
|
GList *walk;
|
|
|
|
g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), FALSE);
|
|
|
|
for (walk = factory->interfaces; walk; walk = g_list_next (walk)) {
|
|
gchar *iname = (gchar *) walk->data;
|
|
|
|
if (!strcmp (iname, interfacename))
|
|
return TRUE;
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
|
|
typedef struct
|
|
{
|
|
GstElementFactoryListType type;
|
|
GstRank minrank;
|
|
} FilterData;
|
|
|
|
|
|
/**
|
|
* gst_element_factory_list_is_type:
|
|
* @factory: a #GstElementFactory
|
|
* @type: a #GstElementFactoryListType
|
|
*
|
|
* Check if @factory is of the given types.
|
|
*
|
|
* Returns: %TRUE if @factory is of @type.
|
|
*
|
|
* Since: 0.10.31
|
|
*/
|
|
gboolean
|
|
gst_element_factory_list_is_type (GstElementFactory * factory,
|
|
GstElementFactoryListType type)
|
|
{
|
|
gboolean res = FALSE;
|
|
const gchar *klass;
|
|
|
|
klass =
|
|
gst_element_factory_get_metadata (factory, GST_ELEMENT_METADATA_KLASS);
|
|
|
|
/* Filter by element type first, as soon as it matches
|
|
* one type, we skip all other tests */
|
|
if (!res && (type & GST_ELEMENT_FACTORY_TYPE_SINK))
|
|
res = (strstr (klass, "Sink") != NULL);
|
|
|
|
if (!res && (type & GST_ELEMENT_FACTORY_TYPE_SRC))
|
|
res = (strstr (klass, "Source") != NULL);
|
|
|
|
if (!res && (type & GST_ELEMENT_FACTORY_TYPE_DECODER))
|
|
res = (strstr (klass, "Decoder") != NULL);
|
|
|
|
if (!res && (type & GST_ELEMENT_FACTORY_TYPE_ENCODER))
|
|
res = (strstr (klass, "Encoder") != NULL);
|
|
|
|
if (!res && (type & GST_ELEMENT_FACTORY_TYPE_MUXER))
|
|
res = (strstr (klass, "Muxer") != NULL);
|
|
|
|
if (!res && (type & GST_ELEMENT_FACTORY_TYPE_DEMUXER))
|
|
res = (strstr (klass, "Demux") != NULL);
|
|
|
|
/* FIXME : We're actually parsing two Classes here... */
|
|
if (!res && (type & GST_ELEMENT_FACTORY_TYPE_PARSER))
|
|
res = ((strstr (klass, "Parser") != NULL)
|
|
&& (strstr (klass, "Codec") != NULL));
|
|
|
|
if (!res && (type & GST_ELEMENT_FACTORY_TYPE_DEPAYLOADER))
|
|
res = (strstr (klass, "Depayloader") != NULL);
|
|
|
|
if (!res && (type & GST_ELEMENT_FACTORY_TYPE_PAYLOADER))
|
|
res = (strstr (klass, "Payloader") != NULL);
|
|
|
|
if (!res && (type & GST_ELEMENT_FACTORY_TYPE_FORMATTER))
|
|
res = (strstr (klass, "Formatter") != NULL);
|
|
|
|
/* Filter by media type now, we only test if it
|
|
* matched any of the types above. */
|
|
if (res
|
|
&& (type & (GST_ELEMENT_FACTORY_TYPE_MEDIA_AUDIO |
|
|
GST_ELEMENT_FACTORY_TYPE_MEDIA_VIDEO |
|
|
GST_ELEMENT_FACTORY_TYPE_MEDIA_IMAGE)))
|
|
res = ((type & GST_ELEMENT_FACTORY_TYPE_MEDIA_AUDIO)
|
|
&& (strstr (klass, "Audio") != NULL))
|
|
|| ((type & GST_ELEMENT_FACTORY_TYPE_MEDIA_VIDEO)
|
|
&& (strstr (klass, "Video") != NULL))
|
|
|| ((type & GST_ELEMENT_FACTORY_TYPE_MEDIA_IMAGE)
|
|
&& (strstr (klass, "Image") != NULL));
|
|
|
|
return res;
|
|
}
|
|
|
|
static gboolean
|
|
element_filter (GstPluginFeature * feature, FilterData * data)
|
|
{
|
|
gboolean res;
|
|
|
|
/* we only care about element factories */
|
|
if (G_UNLIKELY (!GST_IS_ELEMENT_FACTORY (feature)))
|
|
return FALSE;
|
|
|
|
res = (gst_plugin_feature_get_rank (feature) >= data->minrank) &&
|
|
gst_element_factory_list_is_type (GST_ELEMENT_FACTORY_CAST (feature),
|
|
data->type);
|
|
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* gst_element_factory_list_get_elements:
|
|
* @type: a #GstElementFactoryListType
|
|
* @minrank: Minimum rank
|
|
*
|
|
* Get a list of factories that match the given @type. Only elements
|
|
* with a rank greater or equal to @minrank will be returned.
|
|
* The list of factories is returned by decreasing rank.
|
|
*
|
|
* Returns: (transfer full) (element-type Gst.ElementFactory): a #GList of
|
|
* #GstElementFactory elements. Use gst_plugin_feature_list_free() after
|
|
* usage.
|
|
*
|
|
* Since: 0.10.31
|
|
*/
|
|
GList *
|
|
gst_element_factory_list_get_elements (GstElementFactoryListType type,
|
|
GstRank minrank)
|
|
{
|
|
GList *result;
|
|
FilterData data;
|
|
|
|
/* prepare type */
|
|
data.type = type;
|
|
data.minrank = minrank;
|
|
|
|
/* get the feature list using the filter */
|
|
result = gst_default_registry_feature_filter ((GstPluginFeatureFilter)
|
|
element_filter, FALSE, &data);
|
|
|
|
/* sort on rank and name */
|
|
result = g_list_sort (result, gst_plugin_feature_rank_compare_func);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_element_factory_list_filter:
|
|
* @list: (transfer none) (element-type Gst.ElementFactory): a #GList of
|
|
* #GstElementFactory to filter
|
|
* @caps: a #GstCaps
|
|
* @direction: a #GstPadDirection to filter on
|
|
* @subsetonly: whether to filter on caps subsets or not.
|
|
*
|
|
* Filter out all the elementfactories in @list that can handle @caps in
|
|
* the given direction.
|
|
*
|
|
* If @subsetonly is %TRUE, then only the elements whose pads templates
|
|
* are a complete superset of @caps will be returned. Else any element
|
|
* whose pad templates caps can intersect with @caps will be returned.
|
|
*
|
|
* Returns: (transfer full) (element-type Gst.ElementFactory): a #GList of
|
|
* #GstElementFactory elements that match the given requisits.
|
|
* Use #gst_plugin_feature_list_free after usage.
|
|
*
|
|
* Since: 0.10.31
|
|
*/
|
|
GList *
|
|
gst_element_factory_list_filter (GList * list,
|
|
const GstCaps * caps, GstPadDirection direction, gboolean subsetonly)
|
|
{
|
|
GQueue results = G_QUEUE_INIT;
|
|
|
|
GST_DEBUG ("finding factories");
|
|
|
|
/* loop over all the factories */
|
|
for (; list; list = list->next) {
|
|
GstElementFactory *factory;
|
|
const GList *templates;
|
|
GList *walk;
|
|
|
|
factory = (GstElementFactory *) list->data;
|
|
|
|
GST_DEBUG ("Trying %s",
|
|
gst_plugin_feature_get_name ((GstPluginFeature *) factory));
|
|
|
|
/* get the templates from the element factory */
|
|
templates = gst_element_factory_get_static_pad_templates (factory);
|
|
for (walk = (GList *) templates; walk; walk = g_list_next (walk)) {
|
|
GstStaticPadTemplate *templ = walk->data;
|
|
|
|
/* we only care about the sink templates */
|
|
if (templ->direction == direction) {
|
|
GstCaps *tmpl_caps;
|
|
|
|
/* try to intersect the caps with the caps of the template */
|
|
tmpl_caps = gst_static_caps_get (&templ->static_caps);
|
|
|
|
/* FIXME, intersect is not the right method, we ideally want to check
|
|
* for a subset here */
|
|
|
|
/* check if the intersection is empty */
|
|
if ((subsetonly && gst_caps_is_subset (caps, tmpl_caps)) ||
|
|
(!subsetonly && gst_caps_can_intersect (caps, tmpl_caps))) {
|
|
/* non empty intersection, we can use this element */
|
|
g_queue_push_tail (&results, gst_object_ref (factory));
|
|
gst_caps_unref (tmpl_caps);
|
|
break;
|
|
}
|
|
gst_caps_unref (tmpl_caps);
|
|
}
|
|
}
|
|
}
|
|
return results.head;
|
|
}
|