| 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);
#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 : |
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. [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