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GStreamer 0.10 Core Reference Manual | ![]() |
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#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); void gst_plugin_feature_list_free (GList *list); gboolean gst_plugin_feature_check_version (GstPluginFeature *feature, guint min_major, guint min_minor, guint min_micro);
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
feature : | The feature to query |
typedef struct { const gchar *name; GType type; } GstTypeNameData;
Structure used for filtering based on name and type.
const gchar *name; | a name |
GType type; | a GType |
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.
feature : | the pluginfeature to check |
user_data : | the user_data that has been passed on e.g. gst_registry_feature_filter() |
Returns : | TRUE for a positive match, FALSE otherwise |
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) will choose this element over an alternative one with the same function.
The rank is a unsigned integer ranging from 0 (GST_RANK_NONE) to 256 (GST_RANK_PRIMARY). These constants serve as a rough guidiance for defining the rank of a GstPlugin using gst_plugin_feature_set_rank().
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().
feature : | the GstPluginFeature |
data : | the type and name to check against |
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 : | feature to rank |
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.
feature : | a feature |
name : | the name to set |
guint gst_plugin_feature_get_rank (GstPluginFeature *feature);
Gets the rank of a plugin feature.
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.
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:
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;
feature : | the plugin feature to check |
Returns : | A reference to the loaded feature, or NULL on error. |
void gst_plugin_feature_list_free (GList *list);
Unrefs each member of list, then frees the list.
list : | list of GstPluginFeature |
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
feature : | a feature |
min_major : | minimum required major version |
min_minor : | minimum required minor version |
min_micro : | minimum required micro version |
Returns : | TRUE if the plugin feature has at least the required version, otherwise FALSE. |