|  |  |  | GStreamer 0.10 Core Reference Manual |  | 
|---|---|---|---|---|
| Top | Description | Object Hierarchy | ||||
#include <gst/gst.h>
                    GstPluginFeature;
#define             GST_PLUGIN_FEATURE_NAME             (feature)
                    GstTypeNameData;
gboolean            (*GstPluginFeatureFilter)           (GstPluginFeature *feature,
                                                         gpointer user_data);
enum                GstRank;
gboolean            gst_plugin_feature_type_name_filter (GstPluginFeature *feature,
                                                         GstTypeNameData *data);
void                gst_plugin_feature_set_rank         (GstPluginFeature *feature,
                                                         guint rank);
void                gst_plugin_feature_set_name         (GstPluginFeature *feature,
                                                         const gchar *name);
guint               gst_plugin_feature_get_rank         (GstPluginFeature *feature);
const gchar *       gst_plugin_feature_get_name         (GstPluginFeature *feature);
GstPluginFeature *  gst_plugin_feature_load             (GstPluginFeature *feature);
GList *             gst_plugin_feature_list_copy        (GList *list);
void                gst_plugin_feature_list_free        (GList *list);
#define             GST_PLUGIN_FEATURE_LIST_DEBUG       (list)
gboolean            gst_plugin_feature_check_version    (GstPluginFeature *feature,
                                                         guint min_major,
                                                         guint min_minor,
                                                         guint min_micro);
gint                gst_plugin_feature_rank_compare_func
                                                        (gconstpointer p1,
                                                         gconstpointer p2);
GObject +----GstObject +----GstPluginFeature +----GstElementFactory +----GstTypeFindFactory +----GstIndexFactory
typedef struct _GstPluginFeature GstPluginFeature;
Opaque GstPluginFeature structure.
#define GST_PLUGIN_FEATURE_NAME(feature) (GST_PLUGIN_FEATURE (feature)->name)
Get the name of the feature
| 
 | The feature to query | 
typedef struct {
  const gchar   *name;
  GType          type;
} GstTypeNameData;
Structure used for filtering based on name and type.
gboolean (*GstPluginFeatureFilter) (GstPluginFeature *feature,gpointer user_data);
A function that can be used with e.g. gst_registry_feature_filter()
to get a list of pluginfeature that match certain criteria.
| 
 | the pluginfeature to check | 
| 
 | the user_data that has been passed on e.g. gst_registry_feature_filter() | 
| Returns : | TRUEfor a positive match,FALSEotherwise | 
typedef enum {
  GST_RANK_NONE                 = 0,
  GST_RANK_MARGINAL             = 64,
  GST_RANK_SECONDARY            = 128,
  GST_RANK_PRIMARY              = 256
} GstRank;
Element priority ranks. Defines the order in which the autoplugger (or
similar rank-picking mechanisms, such as e.g. gst_element_make_from_uri())
will choose this element over an alternative one with the same function.
These constants serve as a rough guidance for defining the rank of a
GstPluginFeature. Any value is valid, including values bigger than
GST_RANK_PRIMARY.
gboolean gst_plugin_feature_type_name_filter (GstPluginFeature *feature,GstTypeNameData *data);
Compares type and name of plugin feature. Can be used with gst_filter_run().
| 
 | the GstPluginFeature | 
| 
 | the type and name to check against. [in] | 
| Returns : | TRUE if equal. | 
void gst_plugin_feature_set_rank (GstPluginFeature *feature,guint rank);
Specifies a rank for a plugin feature, so that autoplugging uses the most appropriate feature.
| 
 | feature to rank | 
| 
 | rank value - higher number means more priority rank | 
void gst_plugin_feature_set_name (GstPluginFeature *feature,const gchar *name);
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.
| 
 | a feature | 
| 
 | the name to set | 
guint               gst_plugin_feature_get_rank         (GstPluginFeature *feature);
Gets the rank of a plugin feature.
| 
 | a feature | 
| Returns : | The rank of the feature | 
const gchar *       gst_plugin_feature_get_name         (GstPluginFeature *feature);
Gets the name of a plugin feature.
| 
 | a feature | 
| Returns : | the name | 
GstPluginFeature *  gst_plugin_feature_load             (GstPluginFeature *feature);
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:
| 1 2 3 4 5 6 | 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; | 
| 
 | the plugin feature to check. [transfer none] | 
| Returns : | a reference to the loaded feature, or NULL on error. [transfer full] | 
GList *             gst_plugin_feature_list_copy        (GList *list);
Copies the list of features. Caller should call gst_plugin_feature_list_free
when done with the list.
| 
 | list of GstPluginFeature. [transfer none][element-type Gst.PluginFeature] | 
| Returns : | a copy of list,
    with each feature's reference count incremented. [transfer full][element-type Gst.PluginFeature] | 
Since 0.10.26
void                gst_plugin_feature_list_free        (GList *list);
Unrefs each member of list, then frees the list.
| 
 | list of GstPluginFeature. [transfer full][element-type Gst.PluginFeature] | 
gboolean gst_plugin_feature_check_version (GstPluginFeature *feature,guint min_major,guint min_minor,guint min_micro);
Checks whether the given plugin feature is at least the required version
gint gst_plugin_feature_rank_compare_func (gconstpointer p1,gconstpointer p2);
Compares the two given GstPluginFeature instances. This function can be used as a GCompareFunc when sorting by rank and then by name.
| 
 | a GstPluginFeature | 
| 
 | a GstPluginFeature | 
| Returns : | negative value if the rank of p1 > the rank of p2 or the ranks are equal but the name of p1 comes before the name of p2; zero if the rank and names are equal; positive value if the rank of p1 < the rank of p2 or the ranks are equal but the name of p2 comes after the name of p1 | 
Since 0.10.31