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707 lines
20 KiB
C
707 lines
20 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 "gstinfo.h"
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#include "gsturi.h"
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#include "gstregistry.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_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_finalize (GObject * object);
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void __gst_element_details_clear (GstElementDetails * dp);
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static void gst_element_factory_cleanup (GstElementFactory * factory);
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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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/* 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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parent_class = g_type_class_peek_parent (klass);
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gobject_class->finalize = GST_DEBUG_FUNCPTR (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 (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: #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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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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g_free (dp->klass);
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g_free (dp->description);
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g_free (dp->author);
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memset (dp, 0, sizeof (GstElementDetails));
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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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GList *item;
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__gst_element_details_clear (&factory->details);
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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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GstCaps *caps = (GstCaps *) & (templ->static_caps);
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g_free ((gchar *) templ->static_caps.string);
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/* FIXME: this is not threadsafe */
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if (caps->refcount == 1) {
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GstStructure *structure;
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guint i;
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for (i = 0; i < caps->structs->len; i++) {
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structure = (GstStructure *) gst_caps_get_structure (caps, i);
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gst_structure_set_parent_refcount (structure, NULL);
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gst_structure_free (structure);
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}
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g_ptr_array_free (caps->structs, TRUE);
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caps->refcount = 0;
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}
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g_free (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_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, or NULL for a static
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* element (note that passing NULL only works in GStreamer 0.10.13 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_new (GST_TYPE_ELEMENT_FACTORY, 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 ((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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factory->type = type;
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__gst_element_details_copy (&factory->details, &klass->details);
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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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newt = g_new0 (GstStaticPadTemplate, 1);
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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.string = gst_caps_to_string (templ->caps);
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factory->staticpadtemplates =
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g_list_append (factory->staticpadtemplates, newt);
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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_type_full) ||
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(!iface->get_protocols && !iface->get_protocols_full))
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goto urierror;
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if (iface->get_type)
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factory->uri_type = iface->get_type ();
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else if (iface->get_type_full)
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factory->uri_type = iface->get_type_full (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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factory->uri_protocols = g_strdupv (iface->get_protocols ());
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else if (iface->get_protocols_full)
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factory->uri_protocols = iface->get_protocols_full (factory->type);
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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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} else {
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GST_PLUGIN_FEATURE_CAST (factory)->plugin_name = "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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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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}
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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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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_PLUGIN_FEATURE_NAME (factory), GST_STR_NULL (name));
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else
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GST_INFO ("creating element \"%s\"", GST_PLUGIN_FEATURE_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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element = GST_ELEMENT_CAST (g_object_new (factory->type, NULL));
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if (G_UNLIKELY (element == NULL))
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goto no_element;
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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 (
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(gpointer) & oclass->elementfactory, NULL, factory))
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gst_object_unref (factory);
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if (name)
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gst_object_set_name (GST_OBJECT_CAST (element), name);
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GST_DEBUG ("created element \"%s\"", GST_PLUGIN_FEATURE_NAME (factory));
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return element;
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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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}
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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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factory = gst_element_factory_find (factoryname);
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if (factory == NULL)
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goto no_factory;
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GST_LOG_OBJECT (factory, "found factory %p", factory);
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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);
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return element;
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/* ERRORS */
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no_factory:
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{
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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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create_failed:
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{
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GST_INFO_OBJECT (factory, "couldn't create instance!");
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gst_object_unref (factory);
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return NULL;
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}
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}
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|
|
void
|
|
__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 =
|
|
g_list_append (factory->staticpadtemplates, templ);
|
|
factory->numpadtemplates++;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
|
|
/**
|
|
* gst_element_factory_get_longname:
|
|
* @factory: a #GstElementFactory
|
|
*
|
|
* Gets the longname for this factory
|
|
*
|
|
* Returns: the longname
|
|
*/
|
|
G_CONST_RETURN gchar *
|
|
gst_element_factory_get_longname (GstElementFactory * factory)
|
|
{
|
|
g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), NULL);
|
|
|
|
return factory->details.longname;
|
|
}
|
|
|
|
/**
|
|
* gst_element_factory_get_klass:
|
|
* @factory: a #GstElementFactory
|
|
*
|
|
* Gets the class for this factory.
|
|
*
|
|
* Returns: the class
|
|
*/
|
|
G_CONST_RETURN gchar *
|
|
gst_element_factory_get_klass (GstElementFactory * factory)
|
|
{
|
|
g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), NULL);
|
|
|
|
return factory->details.klass;
|
|
}
|
|
|
|
/**
|
|
* gst_element_factory_get_description:
|
|
* @factory: a #GstElementFactory
|
|
*
|
|
* Gets the description for this factory.
|
|
*
|
|
* Returns: the description
|
|
*/
|
|
G_CONST_RETURN gchar *
|
|
gst_element_factory_get_description (GstElementFactory * factory)
|
|
{
|
|
g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), NULL);
|
|
|
|
return factory->details.description;
|
|
}
|
|
|
|
/**
|
|
* gst_element_factory_get_author:
|
|
* @factory: a #GstElementFactory
|
|
*
|
|
* Gets the author for this factory.
|
|
*
|
|
* Returns: the author
|
|
*/
|
|
G_CONST_RETURN gchar *
|
|
gst_element_factory_get_author (GstElementFactory * factory)
|
|
{
|
|
g_return_val_if_fail (GST_IS_ELEMENT_FACTORY (factory), NULL);
|
|
|
|
return factory->details.author;
|
|
}
|
|
|
|
/**
|
|
* 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, g_strdup (interfacename));
|
|
}
|
|
|
|
/**
|
|
* gst_element_factory_get_static_pad_templates:
|
|
* @factory: a #GstElementFactory
|
|
*
|
|
* Gets the #GList of #GstStaticPadTemplate for this factory.
|
|
*
|
|
* Returns: the padtemplates
|
|
*/
|
|
G_CONST_RETURN 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
|
|
*/
|
|
gint
|
|
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: 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_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;
|
|
}
|