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2759882379
Support for (nullable) was added to G-I at the same time as nullable return values. Previous versions of G-I will not mark return values as nullable, even when an (allow-none) annotation is present, so it is not necessary to add (allow-none) annotations for compatibility with older versions of G-I. https://bugzilla.gnome.org/show_bug.cgi?id=730957
146 lines
5.5 KiB
C
146 lines
5.5 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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* gstpluginfeature.h: Header for base GstPluginFeature
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_PLUGIN_FEATURE_H__
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#define __GST_PLUGIN_FEATURE_H__
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#include <glib-object.h>
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#include <gst/gstobject.h>
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#include <gst/gstplugin.h>
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G_BEGIN_DECLS
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#define GST_TYPE_PLUGIN_FEATURE (gst_plugin_feature_get_type())
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#define GST_PLUGIN_FEATURE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_PLUGIN_FEATURE, GstPluginFeature))
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#define GST_IS_PLUGIN_FEATURE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_PLUGIN_FEATURE))
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#define GST_PLUGIN_FEATURE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_PLUGIN_FEATURE, GstPluginFeatureClass))
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#define GST_IS_PLUGIN_FEATURE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_PLUGIN_FEATURE))
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#define GST_PLUGIN_FEATURE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_PLUGIN_FEATURE, GstPluginFeatureClass))
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#define GST_PLUGIN_FEATURE_CAST(obj) ((GstPluginFeature*)(obj))
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/**
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* GstPluginFeature:
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*
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* Opaque #GstPluginFeature structure.
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*/
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typedef struct _GstPluginFeature GstPluginFeature;
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typedef struct _GstPluginFeatureClass GstPluginFeatureClass;
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/**
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* GstRank:
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* @GST_RANK_NONE: will be chosen last or not at all
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* @GST_RANK_MARGINAL: unlikely to be chosen
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* @GST_RANK_SECONDARY: likely to be chosen
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* @GST_RANK_PRIMARY: will be chosen first
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*
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* Element priority ranks. Defines the order in which the autoplugger (or
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* similar rank-picking mechanisms, such as e.g. gst_element_make_from_uri())
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* will choose this element over an alternative one with the same function.
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*
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* These constants serve as a rough guidance for defining the rank of a
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* #GstPluginFeature. Any value is valid, including values bigger than
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* @GST_RANK_PRIMARY.
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*/
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typedef enum {
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GST_RANK_NONE = 0,
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GST_RANK_MARGINAL = 64,
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GST_RANK_SECONDARY = 128,
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GST_RANK_PRIMARY = 256
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} GstRank;
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/**
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* gst_plugin_feature_get_name:
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* @feature: a #GstPluginFeature to get the name of @feature.
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*
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* Returns the name of @feature.
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* For a nameless plugin feature, this returns %NULL.
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*
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* Returns: (transfer none) (nullable): the name of @feature. MT safe.
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*
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*/
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#define gst_plugin_feature_get_name(feature) GST_OBJECT_NAME(feature)
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/**
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* gst_plugin_feature_set_name:
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* @feature: a #GstPluginFeature to set the name of.
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* @name: the new name
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*
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* Sets the name of the plugin feature, getting rid of the old name if there was one.
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*/
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#define gst_plugin_feature_set_name(feature,name) gst_object_set_name(GST_OBJECT_CAST(feature),name)
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/**
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* GstPluginFeatureFilter:
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* @feature: the pluginfeature to check
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* @user_data: the user_data that has been passed on e.g.
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* gst_registry_feature_filter()
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*
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* A function that can be used with e.g. gst_registry_feature_filter()
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* to get a list of pluginfeature that match certain criteria.
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*
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* Returns: %TRUE for a positive match, %FALSE otherwise
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*/
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typedef gboolean (*GstPluginFeatureFilter) (GstPluginFeature *feature,
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gpointer user_data);
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/* normal GObject stuff */
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GType gst_plugin_feature_get_type (void);
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GstPluginFeature *
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gst_plugin_feature_load (GstPluginFeature *feature);
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void gst_plugin_feature_set_rank (GstPluginFeature *feature, guint rank);
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guint gst_plugin_feature_get_rank (GstPluginFeature *feature);
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GstPlugin * gst_plugin_feature_get_plugin (GstPluginFeature *feature);
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const gchar * gst_plugin_feature_get_plugin_name (GstPluginFeature *feature);
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void gst_plugin_feature_list_free (GList *list);
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GList *gst_plugin_feature_list_copy (GList *list) G_GNUC_MALLOC;
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void gst_plugin_feature_list_debug (GList *list);
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/**
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* GST_PLUGIN_FEATURE_LIST_DEBUG:
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* @list: (transfer none) (element-type Gst.PluginFeature): a #GList of
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* plugin features
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*
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* Debug the plugin feature names in @list.
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*/
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#ifndef GST_DISABLE_GST_DEBUG
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#define GST_PLUGIN_FEATURE_LIST_DEBUG(list) gst_plugin_feature_list_debug(list)
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#else
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#define GST_PLUGIN_FEATURE_LIST_DEBUG(list)
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#endif
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gboolean gst_plugin_feature_check_version (GstPluginFeature *feature,
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guint min_major,
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guint min_minor,
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guint min_micro);
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gint gst_plugin_feature_rank_compare_func (gconstpointer p1,
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gconstpointer p2);
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G_END_DECLS
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#endif /* __GST_PLUGIN_FEATURE_H__ */
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