--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gstreamer_core/gst/gstregistry.c	Thu Dec 17 08:53:32 2009 +0200
@@ -0,0 +1,1192 @@
+/* GStreamer
+ * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
+ *                    2000 Wim Taymans <wtay@chello.be>
+ *                    2005 David A. Schleef <ds@schleef.org>
+ *
+ * gstregistry.c: handle registry
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/**
+ * SECTION:gstregistry
+ * @short_description: Abstract base class for management of #GstPlugin objects
+ * @see_also: #GstPlugin, #GstPluginFeature
+ *
+ * One registry holds the metadata of a set of plugins.
+ * All registries build the #GstRegistryPool.
+ *
+ * <emphasis role="bold">Design:</emphasis>
+ *
+ * The #GstRegistry object is a list of plugins and some functions for dealing
+ * with them. #GstPlugins are matched 1-1 with a file on disk, and may or may
+ * not be loaded at a given time. There may be multiple #GstRegistry objects,
+ * but the "default registry" is the only object that has any meaning to the
+ * core.
+ *
+ * The registry.xml file is actually a cache of plugin information. This is
+ * unlike versions prior to 0.10, where the registry file was the primary source
+ * of plugin information, and was created by the gst-register command.
+ *
+ * The primary source, at all times, of plugin information is each plugin file
+ * itself. Thus, if an application wants information about a particular plugin,
+ * or wants to search for a feature that satisfies given criteria, the primary
+ * means of doing so is to load every plugin and look at the resulting
+ * information that is gathered in the default registry. Clearly, this is a time
+ * consuming process, so we cache information in the registry.xml file.
+ *
+ * On startup, plugins are searched for in the plugin search path. This path can
+ * be set directly using the %GST_PLUGIN_PATH environment variable. The registry
+ * file is loaded from ~/.gstreamer-$GST_MAJORMINOR/registry-$ARCH.xml or the
+ * file listed in the %GST_REGISTRY env var. The only reason to change the
+ * registry location is for testing.
+ *
+ * For each plugin that is found in the plugin search path, there could be 3
+ * possibilities for cached information:
+ * <itemizedlist>
+ *   <listitem>
+ *     <para>the cache may not contain information about a given file.</para>
+ *   </listitem>
+ *   <listitem>
+ *     <para>the cache may have stale information.</para>
+ *   </listitem>
+ *   <listitem>
+ *     <para>the cache may have current information.</para>
+ *   </listitem>
+ * </itemizedlist>
+ *
+ * In the first two cases, the plugin is loaded and the cache updated. In
+ * addition to these cases, the cache may have entries for plugins that are not
+ * relevant to the current process. These are marked as not available to the
+ * current process. If the cache is updated for whatever reason, it is marked
+ * dirty.
+ *
+ * A dirty cache is written out at the end of initialization. Each entry is
+ * checked to make sure the information is minimally valid. If not, the entry is
+ * simply dropped.
+ *
+ * <emphasis role="bold">Implementation notes:</emphasis>
+ *
+ * The "cache" and "default registry" are different concepts and can represent
+ * different sets of plugins. For various reasons, at init time, the cache is
+ * stored in the default registry, and plugins not relevant to the current
+ * process are marked with the %GST_PLUGIN_FLAG_CACHED bit. These plugins are
+ * removed at the end of intitialization.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+#include "gst_private.h"
+#include <glib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+
+
+#include "gstinfo.h"
+#include "gstregistry.h"
+#include "gstmarshal.h"
+#include "gstfilter.h"
+
+#ifdef __SYMBIAN32__
+#include <glib_global.h>
+#include "helpfile.h" 
+#endif
+
+#define GST_CAT_DEFAULT GST_CAT_REGISTRY
+
+/* the one instance of the default registry and the mutex protecting the
+ * variable. */
+static GStaticMutex _gst_registry_mutex = G_STATIC_MUTEX_INIT;
+static GstRegistry *_gst_registry_default = NULL;
+
+/* Element signals and args */
+enum
+{
+  PLUGIN_ADDED,
+  FEATURE_ADDED,
+  LAST_SIGNAL
+};
+
+static void gst_registry_finalize (GObject * object);
+
+static guint gst_registry_signals[LAST_SIGNAL] = { 0 };
+
+static GstPluginFeature *gst_registry_lookup_feature_locked (GstRegistry *
+    registry, const char *name);
+static GstPlugin *gst_registry_lookup_locked (GstRegistry * registry,
+    const char *filename);
+
+G_DEFINE_TYPE (GstRegistry, gst_registry, GST_TYPE_OBJECT);
+static GstObjectClass *parent_class = NULL;
+
+static void
+gst_registry_class_init (GstRegistryClass * klass)
+{
+  GObjectClass *gobject_class;
+
+  gobject_class = (GObjectClass *) klass;
+
+  parent_class = g_type_class_peek_parent (klass);
+
+  /**
+   * GstRegistry::plugin-added:
+   * @registry: the registry that emitted the signal
+   * @plugin: the plugin that has been added
+   *
+   * Signals that a plugin has been added to the registry (possibly
+   * replacing a previously-added one by the same name)
+   */
+  gst_registry_signals[PLUGIN_ADDED] =
+      g_signal_new ("plugin-added", G_TYPE_FROM_CLASS (klass),
+      G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRegistryClass, plugin_added), NULL,
+      NULL, gst_marshal_VOID__POINTER, G_TYPE_NONE, 1, G_TYPE_POINTER);
+
+  /**
+   * GstRegistry::feature-added:
+   * @registry: the registry that emitted the signal
+   * @feature: the feature that has been added
+   *
+   * Signals that a feature has been added to the registry (possibly
+   * replacing a previously-added one by the same name)
+   */
+  gst_registry_signals[FEATURE_ADDED] =
+      g_signal_new ("feature-added", G_TYPE_FROM_CLASS (klass),
+      G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRegistryClass, feature_added),
+      NULL, NULL, gst_marshal_VOID__POINTER, G_TYPE_NONE, 1, G_TYPE_POINTER);
+
+  gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_registry_finalize);
+}
+
+static void
+gst_registry_init (GstRegistry * registry)
+{
+  registry->feature_hash = g_hash_table_new (g_str_hash, g_str_equal);
+}
+
+static void
+gst_registry_finalize (GObject * object)
+{
+  GstRegistry *registry = GST_REGISTRY (object);
+  GList *plugins, *p;
+  GList *features, *f;
+
+  plugins = registry->plugins;
+  registry->plugins = NULL;
+
+  GST_DEBUG_OBJECT (registry, "registry finalize");
+  p = plugins;
+  while (p) {
+    GstPlugin *plugin = p->data;
+
+    if (plugin) {
+      GST_LOG_OBJECT (registry, "removing plugin %s",
+          gst_plugin_get_name (plugin));
+      gst_object_unref (plugin);
+    }
+    p = g_list_next (p);
+  }
+  g_list_free (plugins);
+
+  features = registry->features;
+  registry->features = NULL;
+
+  f = features;
+  while (f) {
+    GstPluginFeature *feature = f->data;
+
+    if (feature) {
+      GST_LOG_OBJECT (registry, "removing feature %p (%s)",
+          feature, gst_plugin_feature_get_name (feature));
+      gst_object_unref (feature);
+    }
+    f = g_list_next (f);
+  }
+  g_list_free (features);
+
+  g_hash_table_destroy (registry->feature_hash);
+  registry->feature_hash = NULL;
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+/**
+ * gst_registry_get_default:
+ *
+ * Retrieves the default registry. The caller does not own a reference on the
+ * registry, as it is alive as long as GStreamer is initialized.
+ *
+ * Returns: The default #GstRegistry.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstRegistry *
+gst_registry_get_default (void)
+{
+  GstRegistry *registry;
+
+  g_static_mutex_lock (&_gst_registry_mutex);
+  if (G_UNLIKELY (!_gst_registry_default)) {
+    _gst_registry_default = g_object_new (GST_TYPE_REGISTRY, NULL);
+    gst_object_ref (GST_OBJECT_CAST (_gst_registry_default));
+    gst_object_sink (GST_OBJECT_CAST (_gst_registry_default));
+  }
+  registry = _gst_registry_default;
+  g_static_mutex_unlock (&_gst_registry_mutex);
+
+  return registry;
+}
+
+/**
+ * gst_registry_add_path:
+ * @registry: the registry to add the path to
+ * @path: the path to add to the registry
+ *
+ * Add the given path to the registry. The syntax of the
+ * path is specific to the registry. If the path has already been
+ * added, do nothing.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_registry_add_path (GstRegistry * registry, const gchar * path)
+{
+  g_return_if_fail (GST_IS_REGISTRY (registry));
+  g_return_if_fail (path != NULL);
+
+  if (strlen (path) == 0)
+    goto empty_path;
+
+  GST_OBJECT_LOCK (registry);
+  if (g_list_find_custom (registry->paths, path, (GCompareFunc) strcmp))
+    goto was_added;
+
+  GST_INFO ("Adding plugin path: \"%s\"", path);
+  registry->paths = g_list_append (registry->paths, g_strdup (path));
+  GST_OBJECT_UNLOCK (registry);
+
+  return;
+
+empty_path:
+  {
+    GST_INFO ("Ignoring empty plugin path");
+    return;
+  }
+was_added:
+  {
+    g_warning ("path %s already added to registry", path);
+    GST_OBJECT_UNLOCK (registry);
+    return;
+  }
+}
+
+/**
+ * gst_registry_get_path_list:
+ * @registry: the registry to get the pathlist of
+ *
+ * Get the list of paths for the given registry.
+ *
+ * Returns: A Glist of paths as strings. g_list_free after use.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GList *
+gst_registry_get_path_list (GstRegistry * registry)
+{
+  GList *list;
+
+  g_return_val_if_fail (GST_IS_REGISTRY (registry), NULL);
+
+  GST_OBJECT_LOCK (registry);
+  /* We don't need to copy the strings, because they won't be deleted
+   * as long as the GstRegistry is around */
+  list = g_list_copy (registry->paths);
+  GST_OBJECT_UNLOCK (registry);
+
+  return list;
+}
+
+
+/**
+ * gst_registry_add_plugin:
+ * @registry: the registry to add the plugin to
+ * @plugin: the plugin to add
+ *
+ * Add the plugin to the registry. The plugin-added signal will be emitted.
+ * This function will sink @plugin.
+ *
+ * Returns: TRUE on success.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_registry_add_plugin (GstRegistry * registry, GstPlugin * plugin)
+{
+  GstPlugin *existing_plugin;
+
+  g_return_val_if_fail (GST_IS_REGISTRY (registry), FALSE);
+  g_return_val_if_fail (GST_IS_PLUGIN (plugin), FALSE);
+
+  GST_OBJECT_LOCK (registry);
+  existing_plugin = gst_registry_lookup_locked (registry, plugin->filename);
+  if (G_UNLIKELY (existing_plugin)) {
+    GST_DEBUG_OBJECT (registry,
+        "Replacing existing plugin %p with new plugin %p for filename \"%s\"",
+        existing_plugin, plugin, GST_STR_NULL (plugin->filename));
+    registry->plugins = g_list_remove (registry->plugins, existing_plugin);
+    gst_object_unref (existing_plugin);
+  }
+
+  GST_DEBUG_OBJECT (registry, "adding plugin %p for filename \"%s\"",
+      plugin, GST_STR_NULL (plugin->filename));
+
+  registry->plugins = g_list_prepend (registry->plugins, plugin);
+
+  gst_object_ref (plugin);
+  gst_object_sink (plugin);
+  GST_OBJECT_UNLOCK (registry);
+
+  GST_LOG_OBJECT (registry, "emitting plugin-added for filename \"%s\"",
+      GST_STR_NULL (plugin->filename));
+  g_signal_emit (G_OBJECT (registry), gst_registry_signals[PLUGIN_ADDED], 0,
+      plugin);
+
+  return TRUE;
+}
+
+static void
+gst_registry_remove_features_for_plugin_unlocked (GstRegistry * registry,
+    GstPlugin * plugin)
+{
+  GList *f;
+
+  g_return_if_fail (GST_IS_REGISTRY (registry));
+  g_return_if_fail (GST_IS_PLUGIN (plugin));
+
+  /* Remove all features for this plugin */
+  f = registry->features;
+  while (f != NULL) {
+    GList *next = g_list_next (f);
+    GstPluginFeature *feature = f->data;
+
+    if (feature && !strcmp (feature->plugin_name, gst_plugin_get_name (plugin))) {
+      GST_DEBUG_OBJECT (registry, "removing feature %p (%s) for plugin %s",
+          feature, gst_plugin_feature_get_name (feature),
+          gst_plugin_get_name (plugin));
+
+      registry->features = g_list_delete_link (registry->features, f);
+      g_hash_table_remove (registry->feature_hash, feature->name);
+      gst_object_unref (feature);
+    }
+    f = next;
+  }
+}
+
+/**
+ * gst_registry_remove_plugin:
+ * @registry: the registry to remove the plugin from
+ * @plugin: the plugin to remove
+ *
+ * Remove the plugin from the registry.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_registry_remove_plugin (GstRegistry * registry, GstPlugin * plugin)
+{
+  g_return_if_fail (GST_IS_REGISTRY (registry));
+  g_return_if_fail (GST_IS_PLUGIN (plugin));
+
+  GST_DEBUG_OBJECT (registry, "removing plugin %p (%s)",
+      plugin, gst_plugin_get_name (plugin));
+
+  GST_OBJECT_LOCK (registry);
+  registry->plugins = g_list_remove (registry->plugins, plugin);
+  gst_registry_remove_features_for_plugin_unlocked (registry, plugin);
+  GST_OBJECT_UNLOCK (registry);
+  gst_object_unref (plugin);
+}
+
+/**
+ * gst_registry_add_feature:
+ * @registry: the registry to add the plugin to
+ * @feature: the feature to add
+ *
+ * Add the feature to the registry. The feature-added signal will be emitted.
+ * This function sinks @feature.
+ *
+ * Returns: TRUE on success.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_registry_add_feature (GstRegistry * registry, GstPluginFeature * feature)
+{
+  GstPluginFeature *existing_feature;
+
+  g_return_val_if_fail (GST_IS_REGISTRY (registry), FALSE);
+  g_return_val_if_fail (GST_IS_PLUGIN_FEATURE (feature), FALSE);
+  g_return_val_if_fail (feature->name != NULL, FALSE);
+  g_return_val_if_fail (feature->plugin_name != NULL, FALSE);
+
+  GST_OBJECT_LOCK (registry);
+  existing_feature = gst_registry_lookup_feature_locked (registry,
+      feature->name);
+  if (G_UNLIKELY (existing_feature)) {
+    GST_DEBUG_OBJECT (registry, "replacing existing feature %p (%s)",
+        existing_feature, feature->name);
+    /* Remove the existing feature from the list now, before we insert the new
+     * one, but don't unref yet because the hash is still storing a reference to     * it. */
+    registry->features = g_list_remove (registry->features, existing_feature);
+  }
+
+  GST_DEBUG_OBJECT (registry, "adding feature %p (%s)", feature, feature->name);
+
+  registry->features = g_list_prepend (registry->features, feature);
+  g_hash_table_replace (registry->feature_hash, feature->name, feature);
+
+  if (G_UNLIKELY (existing_feature)) {
+    /* We unref now. No need to remove the feature name from the hash table, it      * got replaced by the new feature */
+    gst_object_unref (existing_feature);
+  }
+
+  gst_object_ref (feature);
+  gst_object_sink (feature);
+  GST_OBJECT_UNLOCK (registry);
+
+  GST_LOG_OBJECT (registry, "emitting feature-added for %s", feature->name);
+  g_signal_emit (G_OBJECT (registry), gst_registry_signals[FEATURE_ADDED], 0,
+      feature);
+
+  return TRUE;
+}
+
+/**
+ * gst_registry_remove_feature:
+ * @registry: the registry to remove the feature from
+ * @feature: the feature to remove
+ *
+ * Remove the feature from the registry.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_registry_remove_feature (GstRegistry * registry, GstPluginFeature * feature)
+{
+  g_return_if_fail (GST_IS_REGISTRY (registry));
+  g_return_if_fail (GST_IS_PLUGIN_FEATURE (feature));
+
+  GST_DEBUG_OBJECT (registry, "removing feature %p (%s)",
+      feature, gst_plugin_feature_get_name (feature));
+
+  GST_OBJECT_LOCK (registry);
+  registry->features = g_list_remove (registry->features, feature);
+  g_hash_table_remove (registry->feature_hash, feature->name);
+  GST_OBJECT_UNLOCK (registry);
+  gst_object_unref (feature);
+}
+
+/**
+ * gst_registry_plugin_filter:
+ * @registry: registry to query
+ * @filter: the filter to use
+ * @first: only return first match
+ * @user_data: user data passed to the filter function
+ *
+ * Runs a filter against all plugins in the registry and returns a #GList with
+ * the results. If the first flag is set, only the first match is
+ * returned (as a list with a single object).
+ * Every plugin is reffed; use gst_plugin_list_free() after use, which
+ * will unref again.
+ *
+ * Returns: a #GList of #GstPlugin. Use gst_plugin_list_free() after usage.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GList *
+gst_registry_plugin_filter (GstRegistry * registry,
+    GstPluginFilter filter, gboolean first, gpointer user_data)
+{
+  GList *list;
+  GList *g;
+
+  g_return_val_if_fail (GST_IS_REGISTRY (registry), NULL);
+
+  GST_OBJECT_LOCK (registry);
+  list = gst_filter_run (registry->plugins, (GstFilterFunc) filter, first,
+      user_data);
+  for (g = list; g; g = g->next) {
+    gst_object_ref (GST_PLUGIN_CAST (g->data));
+  }
+  GST_OBJECT_UNLOCK (registry);
+
+  return list;
+}
+
+/**
+ * gst_registry_feature_filter:
+ * @registry: registry to query
+ * @filter: the filter to use
+ * @first: only return first match
+ * @user_data: user data passed to the filter function
+ *
+ * Runs a filter against all features of the plugins in the registry
+ * and returns a GList with the results.
+ * If the first flag is set, only the first match is
+ * returned (as a list with a single object).
+ *
+ * Returns: a GList of plugin features, gst_plugin_feature_list_free after use.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GList *
+gst_registry_feature_filter (GstRegistry * registry,
+    GstPluginFeatureFilter filter, gboolean first, gpointer user_data)
+{
+  GList *list;
+  GList *g;
+
+  g_return_val_if_fail (GST_IS_REGISTRY (registry), NULL);
+
+  GST_OBJECT_LOCK (registry);
+  list = gst_filter_run (registry->features, (GstFilterFunc) filter, first,
+      user_data);
+  for (g = list; g; g = g->next) {
+    gst_object_ref (GST_PLUGIN_FEATURE_CAST (g->data));
+  }
+  GST_OBJECT_UNLOCK (registry);
+
+  return list;
+}
+
+/**
+ * gst_registry_find_plugin:
+ * @registry: the registry to search
+ * @name: the plugin name to find
+ *
+ * Find the plugin with the given name in the registry.
+ * The plugin will be reffed; caller is responsible for unreffing.
+ *
+ * Returns: The plugin with the given name or NULL if the plugin was not found.
+ * gst_object_unref() after usage.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstPlugin *
+gst_registry_find_plugin (GstRegistry * registry, const gchar * name)
+{
+  GList *walk;
+  GstPlugin *result = NULL;
+
+  g_return_val_if_fail (GST_IS_REGISTRY (registry), NULL);
+  g_return_val_if_fail (name != NULL, NULL);
+
+  walk = gst_registry_plugin_filter (registry,
+      (GstPluginFilter) gst_plugin_name_filter, TRUE, (gpointer) name);
+  if (walk) {
+    result = GST_PLUGIN_CAST (walk->data);
+
+    gst_object_ref (result);
+    gst_plugin_list_free (walk);
+  }
+
+  return result;
+}
+
+/**
+ * gst_registry_find_feature:
+ * @registry: the registry to search
+ * @name: the pluginfeature name to find
+ * @type: the pluginfeature type to find
+ *
+ * Find the pluginfeature with the given name and type in the registry.
+ *
+ * Returns: The pluginfeature with the given name and type or NULL
+ * if the plugin was not found. gst_object_unref() after usage.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstPluginFeature *
+gst_registry_find_feature (GstRegistry * registry, const gchar * name,
+    GType type)
+{
+  GstPluginFeature *feature = NULL;
+  GList *walk;
+  GstTypeNameData data;
+
+  g_return_val_if_fail (GST_IS_REGISTRY (registry), NULL);
+  g_return_val_if_fail (name != NULL, NULL);
+  g_return_val_if_fail (g_type_is_a (type, GST_TYPE_PLUGIN_FEATURE), NULL);
+
+  data.name = name;
+  data.type = type;
+
+  walk = gst_registry_feature_filter (registry,
+      (GstPluginFeatureFilter) gst_plugin_feature_type_name_filter,
+      TRUE, &data);
+
+  if (walk) {
+    feature = GST_PLUGIN_FEATURE_CAST (walk->data);
+
+    gst_object_ref (feature);
+    gst_plugin_feature_list_free (walk);
+  }
+
+  return feature;
+}
+
+/**
+ * gst_registry_get_feature_list:
+ * @registry: a #GstRegistry
+ * @type: a #GType.
+ *
+ * Retrieves a #GList of #GstPluginFeature of @type.
+ *
+ * Returns: a #GList of #GstPluginFeature of @type. gst_plugin_feature_list_free
+ * after usage.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GList *
+gst_registry_get_feature_list (GstRegistry * registry, GType type)
+{
+  GstTypeNameData data;
+
+  g_return_val_if_fail (GST_IS_REGISTRY (registry), NULL);
+  g_return_val_if_fail (g_type_is_a (type, GST_TYPE_PLUGIN_FEATURE), NULL);
+
+  data.type = type;
+  data.name = NULL;
+
+  return gst_registry_feature_filter (registry,
+      (GstPluginFeatureFilter) gst_plugin_feature_type_name_filter,
+      FALSE, &data);
+}
+
+/**
+ * gst_registry_get_plugin_list:
+ * @registry: the registry to search
+ *
+ * Get a copy of all plugins registered in the given registry. The refcount
+ * of each element in the list in incremented.
+ *
+ * Returns: a #GList of #GstPlugin. gst_plugin_list_free after use.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GList *
+gst_registry_get_plugin_list (GstRegistry * registry)
+{
+  GList *list;
+  GList *g;
+
+  g_return_val_if_fail (GST_IS_REGISTRY (registry), NULL);
+
+  GST_OBJECT_LOCK (registry);
+  list = g_list_copy (registry->plugins);
+  for (g = list; g; g = g->next) {
+    gst_object_ref (GST_PLUGIN_CAST (g->data));
+  }
+  GST_OBJECT_UNLOCK (registry);
+
+  return list;
+}
+
+static GstPluginFeature *
+gst_registry_lookup_feature_locked (GstRegistry * registry, const char *name)
+{
+  if (G_UNLIKELY (name == NULL))
+    return NULL;
+
+  return g_hash_table_lookup (registry->feature_hash, name);
+}
+
+/**
+ * gst_registry_lookup_feature:
+ * @registry: a #GstRegistry
+ * @name: a #GstPluginFeature name
+ *
+ * Find a #GstPluginFeature with @name in @registry.
+ *
+ * Returns: a #GstPluginFeature with its refcount incremented, use
+ * gst_object_unref() after usage.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstPluginFeature *
+gst_registry_lookup_feature (GstRegistry * registry, const char *name)
+{
+  GstPluginFeature *feature;
+
+  g_return_val_if_fail (GST_IS_REGISTRY (registry), NULL);
+  g_return_val_if_fail (name != NULL, NULL);
+
+  GST_OBJECT_LOCK (registry);
+  feature = gst_registry_lookup_feature_locked (registry, name);
+  if (feature)
+    gst_object_ref (feature);
+  GST_OBJECT_UNLOCK (registry);
+
+  return feature;
+}
+
+static GstPlugin *
+gst_registry_lookup_locked (GstRegistry * registry, const char *filename)
+{
+  GList *g;
+  GstPlugin *plugin;
+  gchar *basename;
+
+  if (G_UNLIKELY (filename == NULL))
+    return NULL;
+
+  basename = g_path_get_basename (filename);
+  /* FIXME: use GTree speed up lookups */
+  for (g = registry->plugins; g; g = g_list_next (g)) {
+    plugin = GST_PLUGIN_CAST (g->data);
+    if (plugin->basename && strcmp (basename, plugin->basename) == 0) {
+      g_free (basename);
+      return plugin;
+    }
+  }
+
+  g_free (basename);
+  return NULL;
+}
+
+/**
+ * gst_registry_lookup:
+ * @registry: the registry to look up in
+ * @filename: the name of the file to look up
+ *
+ * Look up a plugin in the given registry with the given filename.
+ * If found, plugin is reffed.
+ *
+ * Returns: the #GstPlugin if found, or NULL if not. gst_object_unref()
+ * after usage.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstPlugin *
+gst_registry_lookup (GstRegistry * registry, const char *filename)
+{
+  GstPlugin *plugin;
+
+  g_return_val_if_fail (GST_IS_REGISTRY (registry), NULL);
+  g_return_val_if_fail (filename != NULL, NULL);
+
+  GST_OBJECT_LOCK (registry);
+  plugin = gst_registry_lookup_locked (registry, filename);
+  if (plugin)
+    gst_object_ref (plugin);
+  GST_OBJECT_UNLOCK (registry);
+
+  return plugin;
+}
+
+static gboolean
+gst_registry_scan_path_level (GstRegistry * registry, const gchar * path,
+    int level)
+{
+  GDir *directory[2];
+  GDir *dir;
+  const gchar *dirent;
+  gchar *filename;
+  GstPlugin *plugin;
+  GstPlugin *newplugin;
+  gboolean changed = FALSE;
+
+#ifdef __SYMBIAN32__  
+  GMappedFile *mapped = NULL; 
+  gchar *contents = NULL;  
+  gchar** arglist=NULL;  
+  GError *err = NULL;  
+  char* file;
+  gint i = 2;
+#endif
+  directory[0] = g_dir_open ( PLUGIN_LIST, 0, NULL );
+  directory[1] = g_dir_open ( PLUGIN_LIST_IN_ROM, 0, NULL );
+  while( i ){
+   --i; 
+    dir = directory[i];
+    if (!dir)
+        continue;
+
+  while ((dirent = g_dir_read_name (dir))) 
+  {    
+#ifdef __SYMBIAN32__
+    
+   if( i == 1 )
+        filename = g_strjoin ("\\", PLUGIN_LIST_IN_ROM, dirent, NULL);
+    else
+        filename = g_strjoin ("\\", PLUGIN_LIST, dirent, NULL);
+    mapped = g_mapped_file_new (filename, FALSE, &err);
+    contents = g_mapped_file_get_contents (mapped);
+    arglist = g_strsplit(contents, "\r\n", -1 );
+    
+    g_free (filename);
+     
+    while( *arglist )
+    {
+      filename = *arglist;
+      // trim white spaces from start
+      while(*filename ==' ' )
+          filename++;
+      
+      file = filename;
+      
+      // trim white spaces from last
+      while(*file != ' ' && *file != '\0')
+          file++;
+      *file = '\0';
+      
+      arglist++;
+      /// get the full path of DLL 
+      filename = libgstreamer_get_dll_path( filename );
+
+#else
+      
+	  filename = g_strjoin ("\\", path, dirent, NULL);
+#endif      
+    GST_LOG_OBJECT (registry, "examining file: %s", filename);
+
+    if (g_file_test (filename, G_FILE_TEST_IS_DIR)) {
+      if (level > 0) {
+        GST_LOG_OBJECT (registry, "found directory, recursing");
+        changed |= gst_registry_scan_path_level (registry, filename, level - 1);
+      } else {
+        GST_LOG_OBJECT (registry,
+            "found directory, but recursion level is too deep");
+      }
+      g_free (filename);
+      continue;
+    }
+      if (!g_file_test (filename, G_FILE_TEST_IS_REGULAR)) {
+        GST_LOG_OBJECT (registry, "not a regular file, ignoring");
+        g_free (filename);
+        continue;
+      }
+    if (!g_str_has_suffix (filename, ".so") &&
+        !g_str_has_suffix (filename, ".sl") &&
+        !g_str_has_suffix (filename, ".dll") &&
+        !g_str_has_suffix (filename, ".dynlib")) {
+      GST_LOG_OBJECT (registry,
+          "extension is not recognized as module file, ignoring");
+      g_free (filename);
+      continue;
+    }
+
+    /* plug-ins are considered unique by basename; if the given name
+     * was already seen by the registry, we ignore it */
+    plugin = gst_registry_lookup (registry, filename);
+    if (plugin) {
+      struct stat file_status;
+
+      if (stat (filename, &file_status)) {
+        /* Plugin will be removed from cache after the scan completes if it
+         * is still marked 'cached' */
+        g_free (filename);
+        gst_object_unref (plugin);
+        continue;
+      }
+      if (plugin->registered) {
+        GST_DEBUG_OBJECT (registry,
+            "plugin already registered from path \"%s\"",
+            GST_STR_NULL (plugin->filename));
+        g_free (filename);
+        gst_object_unref (plugin);
+        continue;
+      }
+      if (plugin->file_mtime == file_status.st_mtime &&
+          plugin->file_size == file_status.st_size) {
+        GST_LOG_OBJECT (registry, "file %s cached", filename);
+        plugin->flags &= ~GST_PLUGIN_FLAG_CACHED;
+        GST_LOG_OBJECT (registry, "marking plugin %p as registered as %s",
+            plugin, filename);
+        plugin->registered = TRUE;
+        /* Update the file path on which we've seen this cached plugin
+         * to ensure the registry cache will reflect up to date information */
+        if (strcmp (plugin->filename, filename) != 0) {
+          g_free (plugin->filename);
+          plugin->filename = g_strdup (filename);
+          changed = TRUE;
+        }
+      } else {
+        GST_INFO_OBJECT (registry, "cached info for %s is stale", filename);
+        GST_DEBUG_OBJECT (registry, "mtime %ld != %ld or size %"
+            G_GINT64_FORMAT " != %"
+            G_GINT64_FORMAT, plugin->file_mtime, file_status.st_mtime,
+            (gint64) plugin->file_size, (gint64) file_status.st_size);
+        gst_registry_remove_plugin (gst_registry_get_default (), plugin);
+        /* We don't use a GError here because a failure to load some shared
+         * objects as plugins is normal (particularly in the uninstalled case)
+         */
+        newplugin = gst_plugin_load_file (filename, NULL);
+        if (newplugin) {
+          GST_DEBUG_OBJECT (registry, "marking new plugin %p as registered",
+              newplugin);
+          newplugin->registered = TRUE;
+          gst_object_unref (newplugin);
+        }
+        changed = TRUE;
+      }
+      gst_object_unref (plugin);
+
+    } else {
+      GST_DEBUG_OBJECT (registry, "file %s not yet in registry", filename);
+      newplugin = gst_plugin_load_file (filename, NULL);
+      if (newplugin) {
+        newplugin->registered = TRUE;
+        gst_object_unref (newplugin);
+        changed = TRUE;
+      }
+    }
+
+    g_free (filename);
+  }
+#ifdef __SYMBIAN32__          
+ }  
+#endif
+  g_dir_close (dir);
+}
+  return changed;
+}
+
+/**
+ * gst_registry_scan_path:
+ * @registry: the registry to add the path to
+ * @path: the path to add to the registry
+ *
+ * Add the given path to the registry. The syntax of the
+ * path is specific to the registry. If the path has already been
+ * added, do nothing.
+ *
+ * Returns: %TRUE if registry changed
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_registry_scan_path (GstRegistry * registry, const gchar * path)
+{
+  gboolean changed;
+
+  g_return_val_if_fail (GST_IS_REGISTRY (registry), FALSE);
+  g_return_val_if_fail (path != NULL, FALSE);
+
+  GST_DEBUG_OBJECT (registry, "scanning path %s", path);
+  changed = gst_registry_scan_path_level (registry, path, 10);
+
+  GST_DEBUG_OBJECT (registry, "registry changed in path %s: %d", path, changed);
+
+  return changed;
+}
+
+/* Unref all plugins marked 'cached', to clear old plugins that no
+ * longer exist. Returns TRUE if any plugins were removed */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+_priv_gst_registry_remove_cache_plugins (GstRegistry * registry)
+{
+  GList *g;
+  GList *g_next;
+  GstPlugin *plugin;
+  gboolean changed = FALSE;
+
+  g_return_val_if_fail (GST_IS_REGISTRY (registry), FALSE);
+
+  GST_OBJECT_LOCK (registry);
+
+  GST_DEBUG_OBJECT (registry, "removing cached plugins");
+  g = registry->plugins;
+  while (g) {
+    g_next = g->next;
+    plugin = g->data;
+    if (plugin->flags & GST_PLUGIN_FLAG_CACHED) {
+      GST_DEBUG_OBJECT (registry, "removing cached plugin \"%s\"",
+          GST_STR_NULL (plugin->filename));
+      registry->plugins = g_list_delete_link (registry->plugins, g);
+      gst_registry_remove_features_for_plugin_unlocked (registry, plugin);
+      gst_object_unref (plugin);
+      changed = TRUE;
+    }
+    g = g_next;
+  }
+
+  GST_OBJECT_UNLOCK (registry);
+
+  return changed;
+}
+
+
+static gboolean
+_gst_plugin_feature_filter_plugin_name (GstPluginFeature * feature,
+    gpointer user_data)
+{
+  return (strcmp (feature->plugin_name, (gchar *) user_data) == 0);
+}
+
+/**
+ * gst_registry_get_feature_list_by_plugin:
+ * @registry: a #GstRegistry.
+ * @name: a plugin name.
+ *
+ * Retrieves a #GList of features of the plugin with name @name.
+ *
+ * Returns: a #GList of #GstPluginFeature. gst_plugin_feature_list_free() after usage.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GList *
+gst_registry_get_feature_list_by_plugin (GstRegistry * registry,
+    const gchar * name)
+{
+  g_return_val_if_fail (GST_IS_REGISTRY (registry), NULL);
+  g_return_val_if_fail (name != NULL, NULL);
+
+  return gst_registry_feature_filter (registry,
+      _gst_plugin_feature_filter_plugin_name, FALSE, (gpointer) name);
+}
+
+/* Unref and delete the default registry */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+_priv_gst_registry_cleanup ()
+{
+  GstRegistry *registry;
+
+  g_static_mutex_lock (&_gst_registry_mutex);
+  if ((registry = _gst_registry_default) != NULL) {
+    _gst_registry_default = NULL;
+  }
+  g_static_mutex_unlock (&_gst_registry_mutex);
+
+  /* unref outside of the lock because we can. */
+  if (registry)
+    gst_object_unref (registry);
+}
+
+/**
+ * gst_default_registry_check_feature_version:
+ * @feature_name: the name of the feature (e.g. "oggdemux")
+ * @min_major: the minimum major version number
+ * @min_minor: the minimum minor version number
+ * @min_micro: the minimum micro version number
+ *
+ * Checks whether a plugin feature by the given name exists in the
+ * default registry and whether its version is at least the
+ * version required.
+ *
+ * Returns: #TRUE if the feature could be found and the version is
+ * the same as the required version or newer, and #FALSE otherwise.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_default_registry_check_feature_version (const gchar * feature_name,
+    guint min_major, guint min_minor, guint min_micro)
+{
+  GstPluginFeature *feature;
+  GstRegistry *registry;
+  gboolean ret = FALSE;
+
+  g_return_val_if_fail (feature_name != NULL, FALSE);
+
+  GST_DEBUG ("Looking up plugin feature '%s'", feature_name);
+
+  registry = gst_registry_get_default ();
+  feature = gst_registry_lookup_feature (registry, feature_name);
+  if (feature) {
+    ret = gst_plugin_feature_check_version (feature, min_major, min_minor,
+        min_micro);
+    gst_object_unref (feature);
+  } else {
+    GST_DEBUG ("Could not find plugin feature '%s'", feature_name);
+  }
+
+  return ret;
+}