--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/gstreamer_core/gst/gstpluginfeature.c Thu Dec 17 08:53:32 2009 +0200
@@ -0,0 +1,354 @@
+/* GStreamer
+ * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
+ * 2000 Wim Taymans <wtay@chello.be>
+ *
+ * gstpluginfeature.c: Abstract base class for all plugin features
+ *
+ * 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:gstpluginfeature
+ * @short_description: Base class for contents of a GstPlugin
+ * @see_also: #GstPlugin
+ *
+ * This is a base class for anything that can be added to a #GstPlugin.
+ */
+
+#include "gst_private.h"
+
+#include "gstpluginfeature.h"
+#include "gstplugin.h"
+#include "gstregistry.h"
+#include "gstinfo.h"
+
+#include <string.h>
+
+#define GST_CAT_DEFAULT GST_CAT_PLUGIN_LOADING
+
+static void gst_plugin_feature_finalize (GObject * object);
+
+/* static guint gst_plugin_feature_signals[LAST_SIGNAL] = { 0 }; */
+
+G_DEFINE_ABSTRACT_TYPE (GstPluginFeature, gst_plugin_feature, GST_TYPE_OBJECT);
+static GstObjectClass *parent_class = NULL;
+
+static void
+gst_plugin_feature_class_init (GstPluginFeatureClass * klass)
+{
+ parent_class = g_type_class_peek_parent (klass);
+
+ G_OBJECT_CLASS (klass)->finalize =
+ GST_DEBUG_FUNCPTR (gst_plugin_feature_finalize);
+}
+
+static void
+gst_plugin_feature_init (GstPluginFeature * feature)
+{
+ /* do nothing, needed because of G_DEFINE_TYPE */
+}
+
+static void
+gst_plugin_feature_finalize (GObject * object)
+{
+ GstPluginFeature *feature = GST_PLUGIN_FEATURE_CAST (object);
+
+ GST_DEBUG ("finalizing feature %p: '%s'", feature,
+ GST_PLUGIN_FEATURE_NAME (feature));
+ g_free (feature->name);
+
+ G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+/**
+ * gst_plugin_feature_load:
+ * @feature: the plugin feature to check
+ *
+ * Loads the plugin containing @feature if it's not already loaded. @feature is
+ * unaffected; use the return value instead.
+ *
+ * Normally this function is used like this:
+ *
+ * <programlisting>
+ * GstPluginFeature *loaded_feature;
+ * loaded_feature = gst_plugin_feature_load (feature);
+ * // presumably, we're no longer interested in the potentially-unloaded feature
+ * gst_object_unref (feature);
+ * feature = loaded_feature;
+ * </programlisting>
+ *
+ * Returns: A reference to the loaded feature, or NULL on error.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+GstPluginFeature *
+gst_plugin_feature_load (GstPluginFeature * feature)
+{
+ GstPlugin *plugin;
+ GstPluginFeature *real_feature;
+
+ g_return_val_if_fail (feature != NULL, FALSE);
+ g_return_val_if_fail (GST_IS_PLUGIN_FEATURE (feature), FALSE);
+
+ GST_DEBUG ("loading plugin for feature %p; '%s'", feature,
+ GST_PLUGIN_FEATURE_NAME (feature));
+ if (feature->loaded)
+ return gst_object_ref (feature);
+
+ GST_DEBUG ("loading plugin %s", feature->plugin_name);
+ plugin = gst_plugin_load_by_name (feature->plugin_name);
+ if (!plugin)
+ goto load_failed;
+
+ GST_DEBUG ("loaded plugin %s", feature->plugin_name);
+ gst_object_unref (plugin);
+
+ real_feature =
+ gst_registry_lookup_feature (gst_registry_get_default (), feature->name);
+
+ if (real_feature == NULL)
+ goto disappeared;
+ else if (!real_feature->loaded)
+ goto not_found;
+
+ return real_feature;
+
+ /* ERRORS */
+load_failed:
+ {
+ GST_WARNING ("Failed to load plugin containing feature '%s'.",
+ GST_PLUGIN_FEATURE_NAME (feature));
+ return NULL;
+ }
+disappeared:
+ {
+ GST_INFO
+ ("Loaded plugin containing feature '%s', but feature disappeared.",
+ feature->name);
+ return NULL;
+ }
+not_found:
+ {
+ GST_INFO ("Tried to load plugin containing feature '%s', but feature was "
+ "not found.", real_feature->name);
+ return NULL;
+ }
+}
+
+/**
+ * gst_plugin_feature_type_name_filter:
+ * @feature: the #GstPluginFeature
+ * @data: the type and name to check against
+ *
+ * Compares type and name of plugin feature. Can be used with gst_filter_run().
+ *
+ * Returns: TRUE if equal.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_plugin_feature_type_name_filter (GstPluginFeature * feature,
+ GstTypeNameData * data)
+{
+ return ((data->type == 0 || data->type == G_OBJECT_TYPE (feature)) &&
+ (data->name == NULL
+ || !strcmp (data->name, GST_PLUGIN_FEATURE_NAME (feature))));
+}
+
+/**
+ * gst_plugin_feature_set_name:
+ * @feature: a feature
+ * @name: the name to set
+ *
+ * Sets the name of a plugin feature. The name uniquely identifies a feature
+ * within all features of the same type. Renaming a plugin feature is not
+ * allowed. A copy is made of the name so you should free the supplied @name
+ * after calling this function.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_plugin_feature_set_name (GstPluginFeature * feature, const gchar * name)
+{
+ g_return_if_fail (GST_IS_PLUGIN_FEATURE (feature));
+ g_return_if_fail (name != NULL);
+
+ if (feature->name) {
+ g_return_if_fail (strcmp (feature->name, name) == 0);
+ } else {
+ feature->name = g_strdup (name);
+ }
+ gst_object_set_name (GST_OBJECT (feature), feature->name);
+}
+
+/**
+ * gst_plugin_feature_get_name:
+ * @feature: a feature
+ *
+ * Gets the name of a plugin feature.
+ *
+ * Returns: the name
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+G_CONST_RETURN gchar *
+gst_plugin_feature_get_name (GstPluginFeature * feature)
+{
+ g_return_val_if_fail (GST_IS_PLUGIN_FEATURE (feature), NULL);
+
+ return feature->name;
+}
+
+/**
+ * gst_plugin_feature_set_rank:
+ * @feature: feature to rank
+ * @rank: rank value - higher number means more priority rank
+ *
+ * Specifies a rank for a plugin feature, so that autoplugging uses
+ * the most appropriate feature.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_plugin_feature_set_rank (GstPluginFeature * feature, guint rank)
+{
+ g_return_if_fail (feature != NULL);
+ g_return_if_fail (GST_IS_PLUGIN_FEATURE (feature));
+
+ feature->rank = rank;
+}
+
+/**
+ * gst_plugin_feature_get_rank:
+ * @feature: a feature
+ *
+ * Gets the rank of a plugin feature.
+ *
+ * Returns: The rank of the feature
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+guint
+gst_plugin_feature_get_rank (GstPluginFeature * feature)
+{
+ g_return_val_if_fail (GST_IS_PLUGIN_FEATURE (feature), GST_RANK_NONE);
+
+ return feature->rank;
+}
+
+/**
+ * gst_plugin_feature_list_free:
+ * @list: list of #GstPluginFeature
+ *
+ * Unrefs each member of @list, then frees the list.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_plugin_feature_list_free (GList * list)
+{
+ GList *g;
+
+ for (g = list; g; g = g->next) {
+ GstPluginFeature *feature = GST_PLUGIN_FEATURE_CAST (g->data);
+
+ gst_object_unref (feature);
+ }
+ g_list_free (list);
+}
+
+/**
+ * gst_plugin_feature_check_version:
+ * @feature: a feature
+ * @min_major: minimum required major version
+ * @min_minor: minimum required minor version
+ * @min_micro: minimum required micro version
+ *
+ * Checks whether the given plugin feature is at least
+ * the required version
+ *
+ * Returns: #TRUE if the plugin feature has at least
+ * the required version, otherwise #FALSE.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_plugin_feature_check_version (GstPluginFeature * feature,
+ guint min_major, guint min_minor, guint min_micro)
+{
+ GstRegistry *registry;
+ GstPlugin *plugin;
+ gboolean ret = FALSE;
+
+ g_return_val_if_fail (feature != NULL, FALSE);
+ g_return_val_if_fail (GST_IS_PLUGIN_FEATURE (feature), FALSE);
+
+ GST_DEBUG ("Looking up plugin '%s' containing plugin feature '%s'",
+ feature->plugin_name, feature->name);
+
+ registry = gst_registry_get_default ();
+ plugin = gst_registry_find_plugin (registry, feature->plugin_name);
+
+ if (plugin) {
+ const gchar *ver_str;
+ guint major, minor, micro;
+
+ ver_str = gst_plugin_get_version (plugin);
+ g_return_val_if_fail (ver_str != NULL, FALSE);
+
+ if (sscanf (ver_str, "%u.%u.%u", &major, &minor, µ) == 3) {
+ if (major > min_major)
+ ret = TRUE;
+ else if (major < min_major)
+ ret = FALSE;
+ else if (minor > min_minor)
+ ret = TRUE;
+ else if (minor < min_minor)
+ ret = FALSE;
+ else if (micro > min_micro)
+ ret = TRUE;
+ else
+ ret = (micro == min_micro);
+
+ GST_DEBUG ("Checking whether %u.%u.%u >= %u.%u.%u? %s", major, minor,
+ micro, min_major, min_minor, min_micro, (ret) ? "yes" : "no");
+ } else {
+ GST_WARNING ("Could not parse version string '%s' of plugin '%s'",
+ ver_str, feature->plugin_name);
+ }
+
+ gst_object_unref (plugin);
+ } else {
+ GST_DEBUG ("Could not find plugin '%s'", feature->plugin_name);
+ }
+
+ return ret;
+}