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Original commit message from CVS: Lots of modifications to the plugin system. - Added a GstPluginfeature object that serves as a base class for all plugin contents. - changed the plugin API, everyhting is now added with gst_plugin_add_feature - typefactories are named now so that they can be located easily and filled in at plugin load. - mime types like "video/raw image/raw" are gone for now. - lots of plugin updates (style and API changes) - tested with an without registry. - updates to various tools. - added a little testsuite to test/show how you can load plugins (4 modes) Test this one, Almost everything has changed :-)
393 lines
9.7 KiB
C
393 lines
9.7 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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*
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* gsttype.c: Media-type management functions
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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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/* TODO:
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* probably should set up a hash table for the type id's, since currently
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* it's a rather pathetic linear search. Eventually there may be dozens
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* of id's, but in reality there are only so many instances of lookup, so
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* I'm not overly worried yet...
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*/
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#include "gst_private.h"
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#include "gsttype.h"
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/* global list of registered types */
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static GList *_gst_types;
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static guint16 _gst_maxtype;
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static GList *_gst_typefactories;
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static void gst_typefactory_class_init (GstTypeFactoryClass *klass);
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static void gst_typefactory_init (GstTypeFactory *factory);
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static GstCaps* gst_type_typefind_dummy (GstBuffer *buffer, gpointer priv);
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static xmlNodePtr gst_typefactory_save_thyself (GstObject *object, xmlNodePtr parent);
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static void gst_typefactory_restore_thyself (GstObject *object, xmlNodePtr parent);
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static void gst_typefactory_unload_thyself (GstPluginFeature *feature);
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static GstPluginFeatureClass *parent_class = NULL;
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//static guint gst_typefactory_signals[LAST_SIGNAL] = { 0 };
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GType
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gst_typefactory_get_type (void)
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{
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static GType typefactory_type = 0;
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if (!typefactory_type) {
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static const GTypeInfo typefactory_info = {
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sizeof (GstTypeFactoryClass),
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NULL,
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NULL,
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(GClassInitFunc) gst_typefactory_class_init,
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NULL,
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NULL,
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sizeof(GstTypeFactory),
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0,
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(GInstanceInitFunc) gst_typefactory_init,
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};
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typefactory_type = g_type_register_static (GST_TYPE_PLUGIN_FEATURE,
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"GstTypeFactory", &typefactory_info, 0);
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}
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return typefactory_type;
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}
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static void
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gst_typefactory_class_init (GstTypeFactoryClass *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_ref (GST_TYPE_PLUGIN_FEATURE);
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gstobject_class->save_thyself = GST_DEBUG_FUNCPTR (gst_typefactory_save_thyself);
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gstobject_class->restore_thyself = GST_DEBUG_FUNCPTR (gst_typefactory_restore_thyself);
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gstpluginfeature_class->unload_thyself = GST_DEBUG_FUNCPTR (gst_typefactory_unload_thyself);
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_gst_types = NULL;
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_gst_maxtype = 1; /* type 0 is undefined */
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_gst_typefactories = NULL;
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}
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static void
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gst_typefactory_init (GstTypeFactory *factory)
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{
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_gst_typefactories = g_list_prepend (_gst_typefactories, factory);
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}
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GstTypeFactory*
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gst_typefactory_new (GstTypeDefinition *definition)
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{
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GstTypeFactory *factory;
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g_return_val_if_fail (definition != NULL, NULL);
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g_return_val_if_fail (definition->name != NULL, NULL);
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g_return_val_if_fail (definition->mime != NULL, NULL);
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factory = gst_typefactory_find (definition->name);
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if (!factory) {
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factory = GST_TYPEFACTORY (g_object_new (GST_TYPE_TYPEFACTORY, NULL));
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}
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gst_object_set_name (GST_OBJECT (factory), definition->name);
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factory->mime = g_strdup (definition->mime);
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factory->exts = g_strdup (definition->exts);
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factory->typefindfunc = definition->typefindfunc;
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return factory;
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}
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/**
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* gst_type_register:
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* @factory: the type factory to register
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*
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* Register a new type factory to the system.
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*
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* Returns: the new type id
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*/
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guint16
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gst_type_register (GstTypeFactory *factory)
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{
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guint16 id;
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GstType *type;
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g_return_val_if_fail (factory != NULL, 0);
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// GST_INFO (GST_CAT_TYPES,"type register %s", factory->mime);
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id = gst_type_find_by_mime (factory->mime);
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if (!id) {
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type = g_new0 (GstType, 1);
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type->id = _gst_maxtype++;
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type->mime = factory->mime;
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type->exts = factory->exts;
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type->factories = NULL;
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_gst_types = g_list_prepend (_gst_types, type);
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id = type->id;
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} else {
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type = gst_type_find_by_id (id);
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/* now we want to try to merge the types and return the original */
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/* FIXME: do extension merging here, not that easy */
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/* if there is no existing typefind function, try to use new one */
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}
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GST_DEBUG (GST_CAT_TYPES,"gsttype: %s(%p) gave new mime type '%s', id %d\n",
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GST_OBJECT_NAME (factory), factory, type->mime, type->id);
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type->factories = g_slist_prepend (type->factories, factory);
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return id;
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}
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static guint16
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gst_type_find_by_mime_func (const gchar *mime)
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{
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GList *walk;
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GstType *type;
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gint typelen,mimelen;
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gchar *search, *found;
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g_return_val_if_fail (mime != NULL, 0);
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walk = _gst_types;
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// GST_DEBUG (GST_CAT_TYPES,"searching for '%s'\n",mime);
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mimelen = strlen (mime);
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while (walk) {
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type = (GstType *)walk->data;
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search = type->mime;
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// GST_DEBUG (GST_CAT_TYPES,"checking against '%s'\n",search);
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typelen = strlen (search);
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while ((search - type->mime) < typelen) {
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found = strstr (search, mime);
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/* if the requested mime is in the list */
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if (found) {
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if ((*(found + mimelen) == ' ') ||
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(*(found + mimelen) == ',') ||
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(*(found + mimelen) == '\0')) {
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return type->id;
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} else {
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search = found + mimelen;
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}
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} else
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search += mimelen;
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}
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walk = g_list_next (walk);
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}
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return 0;
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}
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/**
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* gst_type_find_by_mime:
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* @mime: the mime type to find
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*
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* Find the type id of a given mime type.
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*
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* Returns: the type id
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*/
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guint16
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gst_type_find_by_mime (const gchar *mime)
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{
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return gst_type_find_by_mime_func (mime);
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}
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/**
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* gst_type_find_by_ext:
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* @ext: the extension to find
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*
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* Find the type id of a given extention.
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*
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* Returns: the type id
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*/
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guint16
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gst_type_find_by_ext (const gchar *ext)
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{
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//FIXME
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g_warning ("gsttype: find_by_ext not implemented");
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return 0;
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}
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/**
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* gst_type_find_by_id:
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* @id: the type id to lookup
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*
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* Find the type of a given type id.
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*
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* Returns: the type
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*/
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GstType*
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gst_type_find_by_id (guint16 id)
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{
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GList *walk = _gst_types;
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GstType *type;
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while (walk) {
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type = (GstType *)walk->data;
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if (type->id == id)
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return type;
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walk = g_list_next (walk);
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}
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return NULL;
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}
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/**
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* gst_type_get_list:
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*
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* Return a list of all registered types.
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*
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* Returns: a list of GstTypes
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*/
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GList*
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gst_type_get_list (void)
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{
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return _gst_types;
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}
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/**
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* gst_typefactory_find:
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* @name: the name of the typefactory to find
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*
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* Return the TypeFactory with the given name.
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*
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* Returns: a GstTypeFactory with the given name;
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*/
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GstTypeFactory*
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gst_typefactory_find (const gchar *name)
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{
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GList *walk = _gst_typefactories;
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GstTypeFactory *factory;
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while (walk) {
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factory = GST_TYPEFACTORY (walk->data);
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if (!strcmp (GST_OBJECT_NAME (factory), name))
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return factory;
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walk = g_list_next (walk);
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}
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return NULL;
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}
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static void
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gst_typefactory_unload_thyself (GstPluginFeature *feature)
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{
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GstTypeFactory *factory;
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g_return_if_fail (GST_IS_TYPEFACTORY (feature));
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factory = GST_TYPEFACTORY (feature);
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if (factory->typefindfunc)
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factory->typefindfunc = gst_type_typefind_dummy;
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}
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static xmlNodePtr
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gst_typefactory_save_thyself (GstObject *object, xmlNodePtr parent)
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{
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GstTypeFactory *factory;
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g_return_val_if_fail (GST_IS_TYPEFACTORY (object), parent);
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factory = GST_TYPEFACTORY (object);
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if (GST_OBJECT_CLASS (parent_class)->save_thyself) {
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GST_OBJECT_CLASS (parent_class)->save_thyself (object, parent);
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}
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xmlNewChild (parent, NULL, "mime", factory->mime);
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if (factory->exts) {
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xmlNewChild (parent, NULL, "extensions", factory->exts);
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}
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if (factory->typefindfunc) {
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xmlNewChild (parent, NULL, "typefind", NULL);
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}
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return parent;
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}
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static GstCaps*
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gst_type_typefind_dummy (GstBuffer *buffer, gpointer priv)
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{
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GstTypeFactory *factory = (GstTypeFactory *)priv;
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GST_DEBUG (GST_CAT_TYPES,"gsttype: need to load typefind function for %s\n", factory->mime);
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gst_plugin_feature_ensure_loaded (GST_PLUGIN_FEATURE (factory));
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if (factory->typefindfunc) {
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GstCaps *res = factory->typefindfunc (buffer, factory);
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if (res)
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return res;
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}
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return NULL;
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}
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/**
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* gst_typefactory_restore_thyself:
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* @parent: the parent node to load from
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*
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* Load a typefactory from an XML representation.
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*
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* Returns: the new typefactory
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*/
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static void
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gst_typefactory_restore_thyself (GstObject *object, xmlNodePtr parent)
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{
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GstTypeFactory *factory = GST_TYPEFACTORY (object);
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xmlNodePtr field = parent->xmlChildrenNode;
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factory->typefindfunc = NULL;
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if (GST_OBJECT_CLASS (parent_class)->restore_thyself) {
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GST_OBJECT_CLASS (parent_class)->restore_thyself (object, parent);
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}
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while (field) {
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if (!strcmp (field->name, "mime")) {
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factory->mime = xmlNodeGetContent (field);
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}
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else if (!strcmp (field->name, "extensions")) {
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factory->exts = xmlNodeGetContent (field);
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}
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else if (!strcmp (field->name, "typefind")) {
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factory->typefindfunc = gst_type_typefind_dummy;
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}
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field = field->next;
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}
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gst_type_register (factory);
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}
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