GstPluginFeature

typedef struct _GstPluginFeature GstPluginFeature;

Opaque GstPluginFeature structure.

GST_PLUGIN_FEATURE_NAME()

#define GST_PLUGIN_FEATURE_NAME(feature)  (GST_PLUGIN_FEATURE (feature)->name)

Get the name of the feature

GstTypeNameData

typedef struct {
  const gchar   *name;
  GType          type;
} GstTypeNameData;

Structure used for filtering based on name and type.

GstPluginFeatureFilter ()

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.

enum GstRank

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.

gst_plugin_feature_type_name_filter ()

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().

gst_plugin_feature_set_rank ()

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.

gst_plugin_feature_set_name ()

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.

gst_plugin_feature_get_rank ()

guint               gst_plugin_feature_get_rank         (GstPluginFeature *feature);

Gets the rank of a plugin feature.

gst_plugin_feature_get_name ()

const gchar*        gst_plugin_feature_get_name         (GstPluginFeature *feature);

Gets the name of a plugin feature.

gst_plugin_feature_load ()

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:

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;

gst_plugin_feature_list_free ()

void                gst_plugin_feature_list_free        (GList *list);

Unrefs each member of list, then frees the list.

gst_plugin_feature_check_version ()

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