2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wtay@chello.be>
5 * gstpluginfeature.h: Header for base GstPluginFeature
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., 51 Franklin St, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
24 #ifndef __GST_PLUGIN_FEATURE_H__
25 #define __GST_PLUGIN_FEATURE_H__
27 #include <glib-object.h>
28 #include <gst/gstobject.h>
29 #include <gst/gstplugin.h>
33 #define GST_TYPE_PLUGIN_FEATURE (gst_plugin_feature_get_type())
34 #define GST_PLUGIN_FEATURE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_PLUGIN_FEATURE, GstPluginFeature))
35 #define GST_IS_PLUGIN_FEATURE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_PLUGIN_FEATURE))
36 #define GST_PLUGIN_FEATURE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_PLUGIN_FEATURE, GstPluginFeatureClass))
37 #define GST_IS_PLUGIN_FEATURE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_PLUGIN_FEATURE))
38 #define GST_PLUGIN_FEATURE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_PLUGIN_FEATURE, GstPluginFeatureClass))
39 #define GST_PLUGIN_FEATURE_CAST(obj) ((GstPluginFeature*)(obj))
44 * Opaque #GstPluginFeature structure.
46 typedef struct _GstPluginFeature GstPluginFeature;
47 typedef struct _GstPluginFeatureClass GstPluginFeatureClass;
51 * @GST_RANK_NONE: will be chosen last or not at all
52 * @GST_RANK_MARGINAL: unlikely to be chosen
53 * @GST_RANK_SECONDARY: likely to be chosen
54 * @GST_RANK_PRIMARY: will be chosen first
56 * Element priority ranks. Defines the order in which the autoplugger (or
57 * similar rank-picking mechanisms, such as e.g. gst_element_make_from_uri())
58 * will choose this element over an alternative one with the same function.
60 * These constants serve as a rough guidance for defining the rank of a
61 * #GstPluginFeature. Any value is valid, including values bigger than
66 GST_RANK_MARGINAL = 64,
67 GST_RANK_SECONDARY = 128,
68 GST_RANK_PRIMARY = 256
72 * gst_plugin_feature_get_name:
73 * @feature: a #GstPluginFeature to get the name of @feature.
75 * Returns the name of @feature.
76 * For a nameless plugin feature, this returns %NULL.
78 * Returns: (transfer none) (nullable): the name of @feature. MT safe.
81 #define gst_plugin_feature_get_name(feature) GST_OBJECT_NAME(feature)
84 * gst_plugin_feature_set_name:
85 * @feature: a #GstPluginFeature to set the name of.
88 * Sets the name of the plugin feature, getting rid of the old name if there was one.
90 #define gst_plugin_feature_set_name(feature,name) gst_object_set_name(GST_OBJECT_CAST(feature),name)
93 * GstPluginFeatureFilter:
94 * @feature: the pluginfeature to check
95 * @user_data: the user_data that has been passed on e.g.
96 * gst_registry_feature_filter()
98 * A function that can be used with e.g. gst_registry_feature_filter()
99 * to get a list of pluginfeature that match certain criteria.
101 * Returns: %TRUE for a positive match, %FALSE otherwise
103 typedef gboolean (*GstPluginFeatureFilter) (GstPluginFeature *feature,
106 /* normal GObject stuff */
107 GType gst_plugin_feature_get_type (void);
110 gst_plugin_feature_load (GstPluginFeature *feature);
112 void gst_plugin_feature_set_rank (GstPluginFeature *feature, guint rank);
113 guint gst_plugin_feature_get_rank (GstPluginFeature *feature);
115 GstPlugin * gst_plugin_feature_get_plugin (GstPluginFeature *feature);
116 const gchar * gst_plugin_feature_get_plugin_name (GstPluginFeature *feature);
118 void gst_plugin_feature_list_free (GList *list);
119 GList *gst_plugin_feature_list_copy (GList *list) G_GNUC_MALLOC;
120 void gst_plugin_feature_list_debug (GList *list);
123 * GST_PLUGIN_FEATURE_LIST_DEBUG:
124 * @list: (transfer none) (element-type Gst.PluginFeature): a #GList of
127 * Debug the plugin feature names in @list.
129 #ifndef GST_DISABLE_GST_DEBUG
130 #define GST_PLUGIN_FEATURE_LIST_DEBUG(list) gst_plugin_feature_list_debug(list)
132 #define GST_PLUGIN_FEATURE_LIST_DEBUG(list)
135 gboolean gst_plugin_feature_check_version (GstPluginFeature *feature,
139 gint gst_plugin_feature_rank_compare_func (gconstpointer p1,
142 #ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC
143 G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstPluginFeature, gst_object_unref)
149 #endif /* __GST_PLUGIN_FEATURE_H__ */