![]() |
![]() |
![]() |
GStreamer 1.0 Core Reference Manual | ![]() |
---|---|---|---|---|
Top | Description | Object Hierarchy |
#include <gst/gst.h> GstPluginFeature; gboolean (*GstPluginFeatureFilter) (GstPluginFeature *feature
,gpointer user_data
); enum GstRank; void gst_plugin_feature_set_rank (GstPluginFeature *feature
,guint rank
); #define gst_plugin_feature_set_name (feature, name) guint gst_plugin_feature_get_rank (GstPluginFeature *feature
); #define gst_plugin_feature_get_name (feature) GstPlugin * gst_plugin_feature_get_plugin (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 +----GInitiallyUnowned +----GstObject +----GstPluginFeature +----GstElementFactory +----GstTypeFindFactory
typedef struct _GstPluginFeature GstPluginFeature;
Opaque GstPluginFeature structure.
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
.
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 |
#define gst_plugin_feature_set_name(feature,name) gst_object_set_name(GST_OBJECT_CAST(feature),name)
Sets the name of the plugin feature, getting rid of the old name if there was one.
|
a GstPluginFeature to set the name of. |
|
the new name |
guint gst_plugin_feature_get_rank (GstPluginFeature *feature
);
Gets the rank of a plugin feature.
|
a feature |
Returns : |
The rank of the feature |
#define gst_plugin_feature_get_name(feature) GST_OBJECT_NAME(feature)
Returns the name of feature
.
For a nameless plugin feature, this returns NULL.
|
a GstPluginFeature to get the name of feature . |
Returns : |
the name of feature . MT safe. [transfer none]
|
GstPlugin * gst_plugin_feature_get_plugin (GstPluginFeature *feature
);
Get the plugin that provides this feature.
|
a feature |
Returns : |
the plugin that provides this feature, or NULL .
Unref with gst_object_unref() when no longer needed. [transfer full]
|
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]
|
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] |
#define GST_PLUGIN_FEATURE_LIST_DEBUG(list) gst_plugin_feature_list_debug(list)
Debug the plugin feature names in list
.
|
a GList of plugin features. [transfer none][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 |