2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wtay@chello.be>
5 * gstpluginfeature.c: Abstract base class for all plugin features
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
23 * SECTION:gstpluginfeature
24 * @short_description: Base class for contents of a GstPlugin
25 * @see_also: #GstPlugin
27 * This is a base class for anything that can be added to a #GstPlugin.
30 #include "gst_private.h"
32 #include "gstpluginfeature.h"
33 #include "gstplugin.h"
34 #include "gstregistry.h"
39 #define GST_CAT_DEFAULT GST_CAT_PLUGIN_LOADING
41 static void gst_plugin_feature_class_init (GstPluginFeatureClass * klass);
42 static void gst_plugin_feature_init (GstPluginFeature * feature);
43 static void gst_plugin_feature_finalize (GObject * object);
45 /* static guint gst_plugin_feature_signals[LAST_SIGNAL] = { 0 }; */
47 G_DEFINE_ABSTRACT_TYPE (GstPluginFeature, gst_plugin_feature, GST_TYPE_OBJECT);
48 GstObjectClass *parent_class = NULL;
51 gst_plugin_feature_class_init (GstPluginFeatureClass * klass)
53 parent_class = g_type_class_ref (GST_TYPE_OBJECT);
55 G_OBJECT_CLASS (klass)->finalize =
56 GST_DEBUG_FUNCPTR (gst_plugin_feature_finalize);
60 gst_plugin_feature_init (GstPluginFeature * feature)
66 gst_plugin_feature_finalize (GObject * object)
68 GstPluginFeature *feature = GST_PLUGIN_FEATURE (object);
70 GST_DEBUG ("finalizing feature %p", feature);
71 g_free (feature->name);
72 g_free (feature->plugin_name);
74 G_OBJECT_CLASS (parent_class)->finalize (object);
78 * gst_plugin_feature_load:
79 * @feature: the plugin feature to check
81 * Loads the plugin containing @feature if it's not already loaded. @feature is
82 * unaffected; use the return value instead.
84 * Normally this function is used like this:
87 * GstPluginFeature *loaded_feature;
88 * loaded_feature = gst_plugin_feature_load (feature);
89 * // presumably, we're no longer interested in the potentially-unloaded feature
90 * gst_object_unref (feature);
91 * feature = loaded_feature;
94 * Returns: A reference to the loaded feature, or NULL on error.
97 gst_plugin_feature_load (GstPluginFeature * feature)
100 GstPluginFeature *real_feature;
102 g_return_val_if_fail (feature != NULL, FALSE);
103 g_return_val_if_fail (GST_IS_PLUGIN_FEATURE (feature), FALSE);
105 GST_DEBUG ("loading plugin for feature %p", feature);
109 GST_DEBUG ("loading plugin %s", feature->plugin_name);
110 plugin = gst_plugin_load_by_name (feature->plugin_name);
112 g_critical ("Failed to load plugin containing feature '%s'.",
113 GST_PLUGIN_FEATURE_NAME (feature));
116 GST_DEBUG ("loaded plugin %s", feature->plugin_name);
117 gst_object_unref (plugin);
120 gst_registry_lookup_feature (gst_registry_get_default (), feature->name);
122 if (real_feature == NULL) {
124 ("Loaded plugin containing feature '%s', but feature disappeared.",
126 } else if (!real_feature->loaded) {
127 GST_INFO ("Tried to load plugin containing feature '%s', but feature was "
128 "not found.", real_feature->name);
136 gst_plugin_feature_type_name_filter (GstPluginFeature * feature,
137 GstTypeNameData * data)
139 return ((data->type == 0 || data->type == G_OBJECT_TYPE (feature)) &&
141 || !strcmp (data->name, GST_PLUGIN_FEATURE_NAME (feature))));
145 * gst_plugin_feature_set_name:
146 * @feature: a feature
147 * @name: the name to set
149 * Sets the name of a plugin feature. The name uniquely identifies a feature
150 * within all features of the same type. Renaming a plugin feature is not
151 * allowed. A copy is made of the name so you should free the supplied @name
152 * after calling this function.
155 gst_plugin_feature_set_name (GstPluginFeature * feature, const gchar * name)
157 g_return_if_fail (GST_IS_PLUGIN_FEATURE (feature));
158 g_return_if_fail (name != NULL);
161 g_return_if_fail (strcmp (feature->name, name) == 0);
163 feature->name = g_strdup (name);
165 gst_object_set_name (GST_OBJECT (feature), feature->name);
169 * gst_plugin_feature_get_name:
170 * @feature: a feature
172 * Gets the name of a plugin feature.
176 G_CONST_RETURN gchar *
177 gst_plugin_feature_get_name (GstPluginFeature * feature)
179 g_return_val_if_fail (GST_IS_PLUGIN_FEATURE (feature), NULL);
181 return feature->name;
185 * gst_plugin_feature_set_rank:
186 * @feature: feature to rank
187 * @rank: rank value - higher number means more priority rank
189 * Specifies a rank for a plugin feature, so that autoplugging uses
190 * the most appropriate feature.
193 gst_plugin_feature_set_rank (GstPluginFeature * feature, guint rank)
195 g_return_if_fail (feature != NULL);
196 g_return_if_fail (GST_IS_PLUGIN_FEATURE (feature));
198 feature->rank = rank;
202 * gst_plugin_feature_get_rank:
203 * @feature: a feature
205 * Gets the rank of a plugin feature.
207 * Returns: The rank of the feature
210 gst_plugin_feature_get_rank (GstPluginFeature * feature)
212 g_return_val_if_fail (GST_IS_PLUGIN_FEATURE (feature), GST_RANK_NONE);
214 return feature->rank;
218 * gst_plugin_feature_list_free:
219 * @list: list of #GstPluginFeature
221 * Unrefs each member of @list, then frees the list.
224 gst_plugin_feature_list_free (GList * list)
228 for (g = list; g; g = g->next) {
229 GstPluginFeature *feature = GST_PLUGIN_FEATURE (g->data);
231 gst_object_unref (feature);
237 * gst_plugin_feature_check_version:
238 * @feature: a feature
239 * @min_major: minimum required major version
240 * @min_minor: minimum required minor version
241 * @min_micro: minimum required micro version
243 * Checks whether the given plugin feature is at least
244 * the required version
246 * Returns: #TRUE if the plugin feature has at least
247 * the required version, otherwise #FALSE.
250 gst_plugin_feature_check_version (GstPluginFeature * feature,
251 guint min_major, guint min_minor, guint min_micro)
253 GstRegistry *registry;
255 gboolean ret = FALSE;
257 g_return_val_if_fail (feature != NULL, FALSE);
258 g_return_val_if_fail (GST_IS_PLUGIN_FEATURE (feature), FALSE);
260 GST_DEBUG ("Looking up plugin '%s' containing plugin feature '%s'",
261 feature->plugin_name, feature->name);
263 registry = gst_registry_get_default ();
264 plugin = gst_registry_find_plugin (registry, feature->plugin_name);
267 const gchar *ver_str;
268 guint major, minor, micro;
270 ver_str = gst_plugin_get_version (plugin);
271 g_return_val_if_fail (ver_str != NULL, FALSE);
273 if (sscanf (ver_str, "%u.%u.%u", &major, &minor, µ) == 3) {
274 if (major > min_major)
276 else if (major < min_major)
278 else if (minor > min_minor)
280 else if (minor < min_minor)
282 else if (micro > min_micro)
285 ret = (micro == min_micro);
287 GST_DEBUG ("Checking whether %u.%u.%u >= %u.%u.%u? %s", major, minor,
288 micro, min_major, min_minor, min_micro, (ret) ? "yes" : "no");
290 GST_WARNING ("Could not parse version string '%s' of plugin '%s'",
291 ver_str, feature->plugin_name);
294 gst_object_unref (plugin);
296 GST_DEBUG ("Could not find plugin '%s'", feature->plugin_name);