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GStreamer 0.10 Core Reference Manual | ![]() |
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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
); 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
|
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 : |
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, 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 |
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 |
Returns : |
A reference to the loaded feature, or NULL on error. |
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 |
Returns : |
a copy of list , with each feature's reference count incremented.
|
Since 0.10.26
void gst_plugin_feature_list_free (GList *list
);
Unrefs each member of list
, then frees the 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