mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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3ffce00efc
Original commit message from CVS: commiting wim's preliminary threaded work to a branch
621 lines
17 KiB
C
621 lines
17 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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#include "gst_private.h"
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#include "gstelement.h"
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#include "gstregistrypool.h"
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#include "gstinfo.h"
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#include "gsturi.h"
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#include "registries/gstxmlregistry.h" /* g_critical in gst_element_factory_create */
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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_class_init (GstElementFactoryClass * klass);
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static void gst_element_factory_init (GstElementFactory * factory);
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static void gst_element_factory_unload_thyself (GstPluginFeature * feature);
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static GstPluginFeatureClass *parent_class = NULL;
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/* static guint gst_element_factory_signals[LAST_SIGNAL] = { 0 }; */
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GType
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gst_element_factory_get_type (void)
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{
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static GType elementfactory_type = 0;
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if (!elementfactory_type) {
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static const GTypeInfo elementfactory_info = {
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sizeof (GstElementFactoryClass),
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NULL,
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NULL,
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(GClassInitFunc) gst_element_factory_class_init,
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NULL,
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NULL,
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sizeof (GstElementFactory),
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0,
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(GInstanceInitFunc) gst_element_factory_init,
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NULL
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};
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elementfactory_type = g_type_register_static (GST_TYPE_PLUGIN_FEATURE,
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"GstElementFactory", &elementfactory_info, 0);
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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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return elementfactory_type;
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}
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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;
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GstObjectClass *gstobject_class;
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GstPluginFeatureClass *gstpluginfeature_class;
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gobject_class = (GObjectClass *) klass;
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gstobject_class = (GstObjectClass *) klass;
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gstpluginfeature_class = (GstPluginFeatureClass *) klass;
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parent_class = g_type_class_peek_parent (klass);
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gstpluginfeature_class->unload_thyself =
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GST_DEBUG_FUNCPTR (gst_element_factory_unload_thyself);
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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->padtemplates = 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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/**
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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.
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*
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* Returns: #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_pool_find_feature (name, 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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void
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__gst_element_details_clear (GstElementDetails * dp)
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{
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g_free (dp->longname);
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dp->longname = NULL;
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g_free (dp->klass);
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dp->klass = NULL;
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g_free (dp->description);
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dp->description = NULL;
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g_free (dp->author);
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dp->author = NULL;
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}
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#define VALIDATE_SET(__dest, __src, __entry) \
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G_STMT_START { \
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if (g_utf8_validate (__src->__entry, -1, NULL)) { \
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__dest->__entry = g_strdup (__src->__entry); \
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} else { \
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g_warning ("Invalid UTF-8 in " G_STRINGIFY (__entry) ": %s", \
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__src->__entry); \
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__dest->__entry = g_strdup ("[ERROR: invalid UTF-8]"); \
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} \
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} G_STMT_END
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void
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__gst_element_details_set (GstElementDetails * dest,
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const GstElementDetails * src)
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{
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VALIDATE_SET (dest, src, longname);
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VALIDATE_SET (dest, src, klass);
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VALIDATE_SET (dest, src, description);
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VALIDATE_SET (dest, src, author);
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}
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void
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__gst_element_details_copy (GstElementDetails * dest,
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const GstElementDetails * src)
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{
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__gst_element_details_clear (dest);
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__gst_element_details_set (dest, src);
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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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__gst_element_details_clear (&factory->details);
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if (factory->type) {
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g_type_class_unref (g_type_class_peek (factory->type));
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factory->type = 0;
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}
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g_list_foreach (factory->padtemplates, (GFunc) gst_object_unref, NULL);
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g_list_free (factory->padtemplates);
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factory->padtemplates = 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_foreach (factory->interfaces, (GFunc) g_free, NULL);
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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: #GstPlugin to register the element with
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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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* given type.
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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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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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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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factory = gst_element_factory_find (name);
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if (!factory) {
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factory =
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GST_ELEMENT_FACTORY (g_object_new (GST_TYPE_ELEMENT_FACTORY, NULL));
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gst_plugin_feature_set_name (GST_PLUGIN_FEATURE (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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gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
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} else {
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g_return_val_if_fail (factory->type == 0, FALSE);
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gst_element_factory_cleanup (factory);
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GST_LOG_OBJECT (factory, "Reuse existing elementfactory for type %s",
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g_type_name (type));
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}
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klass = GST_ELEMENT_CLASS (g_type_class_ref (type));
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factory->type = type;
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__gst_element_details_copy (&factory->details, &klass->details);
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factory->padtemplates = g_list_copy (klass->padtemplates);
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g_list_foreach (factory->padtemplates, (GFunc) gst_object_ref, NULL);
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factory->numpadtemplates = klass->numpadtemplates;
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klass->elementfactory = factory;
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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 error;
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factory->uri_type = iface->get_type ();
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if (!GST_URI_TYPE_IS_VALID (factory->uri_type))
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goto error;
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factory->uri_protocols = g_strdupv (iface->get_protocols ());
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if (!factory->uri_protocols)
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goto error;
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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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gst_plugin_feature_set_rank (GST_PLUGIN_FEATURE (factory), rank);
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return TRUE;
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error:
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gst_element_factory_cleanup (factory);
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return FALSE;
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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: name of new element
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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: new #GstElement or NULL if the element couldn't 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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g_return_val_if_fail (factory != NULL, NULL);
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if (!gst_plugin_feature_ensure_loaded (GST_PLUGIN_FEATURE (factory))) {
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GST_INFO ("could not load element factory for element \"%s\"", name);
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return NULL;
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}
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if (name)
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GST_INFO ("creating \"%s\" named \"%s\"", GST_PLUGIN_FEATURE_NAME (factory),
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GST_STR_NULL (name));
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else
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GST_INFO ("creating \"%s\"", GST_PLUGIN_FEATURE_NAME (factory));
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if (factory->type == 0) {
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GstPlugin *plugin = GST_PLUGIN_FEATURE (factory)->manager;
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g_critical
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("Factory for `%s' has no type. This probably means the plugin wasn't found because the registry is broken. The plugin GStreamer was looking for is named '%s' and is expected in file '%s'. The registry for this plugin is located at '%s'",
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GST_PLUGIN_FEATURE_NAME (factory),
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gst_plugin_get_name (plugin), gst_plugin_get_filename (plugin),
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GST_IS_XML_REGISTRY (plugin->manager) ? GST_XML_REGISTRY (plugin->
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manager)->location : "Unknown");
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return NULL;
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}
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oclass = GST_ELEMENT_CLASS (g_type_class_ref (factory->type));
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if (oclass->elementfactory == NULL)
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oclass->elementfactory = factory;
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/* create an instance of the element */
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element = GST_ELEMENT (g_object_new (factory->type, NULL));
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g_assert (element != NULL);
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g_type_class_unref (oclass);
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gst_object_set_name (GST_OBJECT (element), name);
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return element;
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}
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/**
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* gst_element_factory_make:
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* @factoryname: a named factory to instantiate
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* @name: name of new element
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*
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* Create a new element of the type defined by the given element factory.
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* 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.
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* If name is given, it will be given the name supplied.
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*
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* Returns: new #GstElement or NULL if unable to create element
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*/
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GstElement *
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gst_element_factory_make (const gchar * factoryname, const gchar * name)
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{
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GstElementFactory *factory;
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GstElement *element;
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g_return_val_if_fail (factoryname != NULL, NULL);
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GST_LOG ("gstelementfactory: make \"%s\" \"%s\"",
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factoryname, GST_STR_NULL (name));
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/* gst_plugin_load_element_factory (factoryname); */
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factory = gst_element_factory_find (factoryname);
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if (factory == NULL) {
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GST_INFO ("no such element factory \"%s\"!", factoryname);
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return NULL;
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}
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element = gst_element_factory_create (factory, name);
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if (element == NULL) {
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GST_INFO_OBJECT (factory, "couldn't create instance!");
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return NULL;
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}
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return element;
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}
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void
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__gst_element_factory_add_pad_template (GstElementFactory * factory,
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GstPadTemplate * templ)
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{
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g_return_if_fail (factory != NULL);
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g_return_if_fail (templ != NULL);
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gst_object_ref (GST_OBJECT (templ));
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gst_object_sink (GST_OBJECT (templ));
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factory->padtemplates = g_list_append (factory->padtemplates, templ);
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factory->numpadtemplates++;
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}
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/**
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* gst_element_factory_get_element_type:
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* @factory: factory to get managed #GType from
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*
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* Get the #GType for elements managed by this factory
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*
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* Returns: the #GType for elements managed by this factory
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*/
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GType
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gst_element_factory_get_element_type (GstElementFactory * factory)
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{
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g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), 0);
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return factory->type;
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}
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/**
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* gst_element_factory_get_longname:
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* @factory: a #GstElementFactory
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*
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* Gets the longname for this factory
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*
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* Returns: the longname
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*/
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G_CONST_RETURN gchar *
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gst_element_factory_get_longname (GstElementFactory * factory)
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{
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g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), NULL);
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return factory->details.longname;
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}
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/**
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* gst_element_factory_get_class:
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* @factory: a #GstElementFactory
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*
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* Gets the class for this factory.
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*
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* Returns: the class
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*/
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G_CONST_RETURN gchar *
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gst_element_factory_get_klass (GstElementFactory * factory)
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{
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g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), NULL);
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return factory->details.klass;
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}
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/**
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* gst_element_factory_get_description:
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* @factory: a #GstElementFactory
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*
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* Gets the description for this factory.
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*
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* Returns: the description
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*/
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G_CONST_RETURN gchar *
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gst_element_factory_get_description (GstElementFactory * factory)
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{
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g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), NULL);
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return factory->details.description;
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}
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/**
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* gst_element_factory_get_author:
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* @factory: a #GstElementFactory
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*
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* Gets the author for this factory.
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*
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* Returns: the author
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*/
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G_CONST_RETURN gchar *
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gst_element_factory_get_author (GstElementFactory * factory)
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{
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g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), NULL);
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return factory->details.author;
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}
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|
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/**
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* gst_element_factory_get_num_pad_templates:
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* @factory: a #GstElementFactory
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*
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* Gets the number of pad_templates in this factory.
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*
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* Returns: the number of pad_templates
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*/
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guint
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gst_element_factory_get_num_pad_templates (GstElementFactory * factory)
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{
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g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), 0);
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return factory->numpadtemplates;
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}
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|
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/**
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|
* __gst_element_factory_add_interface:
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|
* @elementfactory: The elementfactory to add the interface to
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* @interfacename: Name of the interface
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*
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* Adds the given interfacename to the list of implemented interfaces of the
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* element.
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*/
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void
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__gst_element_factory_add_interface (GstElementFactory * elementfactory,
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const gchar * interfacename)
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{
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g_return_if_fail (GST_IS_ELEMENT_FACTORY (elementfactory));
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g_return_if_fail (interfacename != NULL);
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g_return_if_fail (interfacename[0] != '\0'); /* no empty string */
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elementfactory->interfaces =
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g_list_prepend (elementfactory->interfaces, g_strdup (interfacename));
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}
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|
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/**
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* gst_element_factory_get_pad_templates:
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* @factory: a #GstElementFactory
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*
|
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* Gets the #GList of padtemplates for this factory.
|
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*
|
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* Returns: the padtemplates
|
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*/
|
|
G_CONST_RETURN GList *
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gst_element_factory_get_pad_templates (GstElementFactory * factory)
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{
|
|
g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), NULL);
|
|
|
|
return factory->padtemplates;
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
guint
|
|
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 ownt by the element factory. Use g_strdupv() if you want to.
|
|
*
|
|
* Returns: the supported protocols or NULL
|
|
*/
|
|
gchar **
|
|
gst_element_factory_get_uri_protocols (GstElementFactory * factory)
|
|
{
|
|
g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), NULL);
|
|
|
|
return factory->uri_protocols;
|
|
}
|
|
|
|
/**
|
|
* gst_element_factory_can_src_caps :
|
|
* @factory: factory to query
|
|
* @caps: the caps to check
|
|
*
|
|
* Checks if the factory can source the given capability.
|
|
*
|
|
* Returns: true if it can src the capabilities
|
|
*/
|
|
gboolean
|
|
gst_element_factory_can_src_caps (GstElementFactory * factory,
|
|
const GstCaps * caps)
|
|
{
|
|
GList *templates;
|
|
|
|
g_return_val_if_fail (factory != NULL, FALSE);
|
|
g_return_val_if_fail (caps != NULL, FALSE);
|
|
|
|
templates = factory->padtemplates;
|
|
|
|
while (templates) {
|
|
GstPadTemplate *template = (GstPadTemplate *) templates->data;
|
|
|
|
if (template->direction == GST_PAD_SRC) {
|
|
if (gst_caps_is_always_compatible (GST_PAD_TEMPLATE_CAPS (template),
|
|
caps))
|
|
return TRUE;
|
|
}
|
|
templates = g_list_next (templates);
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
/**
|
|
* gst_element_factory_can_sink_caps :
|
|
* @factory: factory to query
|
|
* @caps: the caps to check
|
|
*
|
|
* Checks if the factory can sink the given capability.
|
|
*
|
|
* Returns: true if it can sink the capabilities
|
|
*/
|
|
gboolean
|
|
gst_element_factory_can_sink_caps (GstElementFactory * factory,
|
|
const GstCaps * caps)
|
|
{
|
|
GList *templates;
|
|
|
|
g_return_val_if_fail (factory != NULL, FALSE);
|
|
g_return_val_if_fail (caps != NULL, FALSE);
|
|
|
|
templates = factory->padtemplates;
|
|
|
|
while (templates) {
|
|
GstPadTemplate *template = (GstPadTemplate *) templates->data;
|
|
|
|
if (template->direction == GST_PAD_SINK) {
|
|
if (gst_caps_is_always_compatible (caps,
|
|
GST_PAD_TEMPLATE_CAPS (template)))
|
|
return TRUE;
|
|
}
|
|
templates = g_list_next (templates);
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
static void
|
|
gst_element_factory_unload_thyself (GstPluginFeature * feature)
|
|
{
|
|
GstElementFactory *factory;
|
|
|
|
factory = GST_ELEMENT_FACTORY (feature);
|
|
|
|
if (factory->type) {
|
|
g_type_class_unref (g_type_class_peek (factory->type));
|
|
factory->type = 0;
|
|
}
|
|
}
|