## GstRegistry

GstRegistry — Abstract base class for management of GstPlugin objects.

## Synopsis

    #include <gst/gst.h>

                GstRegistry;
    #define     GLOBAL_REGISTRY_DIR
    #define     GLOBAL_REGISTRY_FILE
    #define     GLOBAL_REGISTRY_FILE_TMP
    #define     LOCAL_REGISTRY_DIR
    #define     LOCAL_REGISTRY_FILE
    #define     LOCAL_REGISTRY_FILE_TMP
    #define     REGISTRY_DIR_PERMS
    #define     REGISTRY_TMPFILE_PERMS
    #define     REGISTRY_FILE_PERMS
    enum        GstRegistryReturn;
    enum        GstRegistryFlags;
    gboolean    gst_registry_load               (GstRegistry *registry);
    gboolean    gst_registry_is_loaded          (GstRegistry *registry);
    gboolean    gst_registry_save               (GstRegistry *registry);
    gboolean    gst_registry_rebuild            (GstRegistry *registry);
    gboolean    gst_registry_unload             (GstRegistry *registry);
    void        gst_registry_add_path           (GstRegistry *registry,
                                                 const gchar *path);
    GList*      gst_registry_get_path_list      (GstRegistry *registry);
    void        gst_registry_clear_paths        (GstRegistry *registry);
    gboolean    gst_registry_add_plugin         (GstRegistry *registry,
                                                 GstPlugin *plugin);
    void        gst_registry_remove_plugin      (GstRegistry *registry,
                                                 GstPlugin *plugin);
    GList*      gst_registry_plugin_filter      (GstRegistry *registry,
                                                 GstPluginFilter filter,
                                                 gboolean first,
                                                 gpointer user_data);
    GList*      gst_registry_feature_filter     (GstRegistry *registry,
                                                 GstPluginFeatureFilter filter,
                                                 gboolean first,
                                                 gpointer user_data);
    GstPlugin*  gst_registry_find_plugin        (GstRegistry *registry,
                                                 const gchar *name);
    GstPluginFeature* gst_registry_find_feature (GstRegistry *registry,
                                                 const gchar *name,
                                                 GType type);
    GstRegistryReturn gst_registry_load_plugin  (GstRegistry *registry,
                                                 GstPlugin *plugin);
    GstRegistryReturn gst_registry_unload_plugin
                                                (GstRegistry *registry,
                                                 GstPlugin *plugin);
    GstRegistryReturn gst_registry_update_plugin
                                                (GstRegistry *registry,
                                                 GstPlugin *plugin);

## Object Hierarchy

      GObject
       +----GstRegistry

## Description

One registry holds the metadata of a set of plugins. All registries build the GstRegistryPool.

## Details

### GstRegistry

    typedef struct _GstRegistry GstRegistry;

### GLOBAL_REGISTRY_DIR

    #define GLOBAL_REGISTRY_DIR      GST_CACHE_DIR

### GLOBAL_REGISTRY_FILE

    #define GLOBAL_REGISTRY_FILE     GLOBAL_REGISTRY_DIR"/registry.xml"

### GLOBAL_REGISTRY_FILE_TMP

    #define GLOBAL_REGISTRY_FILE_TMP GLOBAL_REGISTRY_DIR"/.registry.xml.tmp"

### LOCAL_REGISTRY_DIR

    #define LOCAL_REGISTRY_DIR       ".gstreamer-"GST_MAJORMINOR

### LOCAL_REGISTRY_FILE

    #define LOCAL_REGISTRY_FILE      LOCAL_REGISTRY_DIR"/registry.xml"

### LOCAL_REGISTRY_FILE_TMP

    #define LOCAL_REGISTRY_FILE_TMP  LOCAL_REGISTRY_DIR"/.registry.xml.tmp"

### REGISTRY_DIR_PERMS

    #define     REGISTRY_DIR_PERMS

### REGISTRY_TMPFILE_PERMS

    #define     REGISTRY_TMPFILE_PERMS

### REGISTRY_FILE_PERMS

    #define     REGISTRY_FILE_PERMS

### enum GstRegistryReturn

    typedef enum {
      GST_REGISTRY_OK			= (0),
      GST_REGISTRY_LOAD_ERROR		= (1 << 1),
      GST_REGISTRY_SAVE_ERROR		= (1 << 2),
      GST_REGISTRY_PLUGIN_LOAD_ERROR	= (1 << 3),
      GST_REGISTRY_PLUGIN_SIGNATURE_ERROR	= (1 << 4)
    } GstRegistryReturn;

The return value of registry operations

`GST_REGISTRY_OK` | The registry reported no error.
`GST_REGISTRY_LOAD_ERROR` | There was a load error
`GST_REGISTRY_SAVE_ERROR` | There was an error saving the registry
`GST_REGISTRY_PLUGIN_LOAD_ERROR` | There was an error loading a plugin
`GST_REGISTRY_PLUGIN_SIGNATURE_ERROR` | There was an error saving a plugin

### enum GstRegistryFlags

    typedef enum {
      GST_REGISTRY_READABLE			= (1 << 1),
      GST_REGISTRY_WRITABLE			= (1 << 2),
      GST_REGISTRY_EXISTS			= (1 << 3),
      GST_REGISTRY_REMOTE			= (1 << 4),
      GST_REGISTRY_DELAYED_LOADING		= (1 << 5)
    } GstRegistryFlags;

Flags for the registry

`GST_REGISTRY_READABLE` | The registry can be read
`GST_REGISTRY_WRITABLE` | The registry can be written to
`GST_REGISTRY_EXISTS` | The registry exists
`GST_REGISTRY_REMOTE` | The registry is remote and might be slower
`GST_REGISTRY_DELAYED_LOADING` | The registry will be loaded on demand.

### gst_registry_load ()

    gboolean    gst_registry_load               (GstRegistry *registry);

Load the given registry

`registry` : | the registry to load
Returns : | TRUE on success.

### gst_registry_is_loaded ()

    gboolean    gst_registry_is_loaded          (GstRegistry *registry);

Check if the given registry is loaded

`registry` : | the registry to check
Returns : | TRUE if loaded.

### gst_registry_save ()

    gboolean    gst_registry_save               (GstRegistry *registry);

Save the contents of the given registry

`registry` : | the registry to save
Returns : | TRUE on success

### gst_registry_rebuild ()

    gboolean    gst_registry_rebuild            (GstRegistry *registry);

Rebuild the given registry

`registry` : | the registry to rebuild
Returns : | TRUE on success

### gst_registry_unload ()

    gboolean    gst_registry_unload             (GstRegistry *registry);

Unload the given registry

`registry` : | the registry to unload
Returns : | TRUE on success

### gst_registry_add_path ()

    void        gst_registry_add_path           (GstRegistry *registry,
                                                 const gchar *path);

Add the given path to the registry. The syntax of the path is specific to the registry. If the path has already been added, do nothing.

`registry` : | the registry to add the path to
`path` : | the path to add to the registry

### gst_registry_get_path_list ()

    GList*      gst_registry_get_path_list      (GstRegistry *registry);

Get the list of paths for the given registry.

`registry` : | the registry to get the pathlist of
Returns : | A Glist of paths as strings. g_list_free after use.

### gst_registry_clear_paths ()

    void        gst_registry_clear_paths        (GstRegistry *registry);

Clear the paths of the given registry

`registry` : | the registry to clear the paths of

### gst_registry_add_plugin ()

    gboolean    gst_registry_add_plugin         (GstRegistry *registry,
                                                 GstPlugin *plugin);

Add the plugin to the registry. The plugin-added signal will be emitted.

`registry` : | the registry to add the plugin to
`plugin` : | the plugin to add
Returns : | TRUE on success.

### gst_registry_remove_plugin ()

    void        gst_registry_remove_plugin      (GstRegistry *registry,
                                                 GstPlugin *plugin);

Remove the plugin from the registry.

`registry` : | the registry to remove the plugin from
`plugin` : | the plugin to remove

### gst_registry_plugin_filter ()

    GList*      gst_registry_plugin_filter      (GstRegistry *registry,
                                                 GstPluginFilter filter,
                                                 gboolean first,
                                                 gpointer user_data);

Runs a filter against all plugins in the registry and returns a GList with the results. If the first flag is set, only the first match is returned (as a list with a single object).

`registry` : | registry to query
`filter` : | the filter to use
`first` : | only return first match
`user_data` : | user data passed to the filter function
Returns : | a GList of plugins, g_list_free after use.

### gst_registry_feature_filter ()

    GList*      gst_registry_feature_filter     (GstRegistry *registry,
                                                 GstPluginFeatureFilter filter,
                                                 gboolean first,
                                                 gpointer user_data);

Runs a filter against all features of the plugins in the registry and returns a GList with the results. If the first flag is set, only the first match is returned (as a list with a single object).

`registry` : | registry to query
`filter` : | the filter to use
`first` : | only return first match
`user_data` : | user data passed to the filter function
Returns : | a GList of plugin features, g_list_free after use.

### gst_registry_find_plugin ()

    GstPlugin*  gst_registry_find_plugin        (GstRegistry *registry,
                                                 const gchar *name);

Find the plugin with the given name in the registry.

`registry` : | the registry to search
`name` : | the plugin name to find
Returns : | The plugin with the given name or NULL if the plugin was not found.

### gst_registry_find_feature ()

    GstPluginFeature* gst_registry_find_feature (GstRegistry *registry,
                                                 const gchar *name,
                                                 GType type);

Find the pluginfeature with the given name and type in the registry.

`registry` : | the registry to search
`name` : | the pluginfeature name to find
`type` : | the pluginfeature type to find
Returns : | The pluginfeature with the given name and type or NULL if the plugin was not found.

### gst_registry_load_plugin ()

    GstRegistryReturn gst_registry_load_plugin  (GstRegistry *registry,
                                                 GstPlugin *plugin);

Bring the plugin from the registry into memory.

`registry` : | the registry to load the plugin from
`plugin` : | the plugin to load
Returns : | a value indicating the result

### gst_registry_unload_plugin ()

    GstRegistryReturn gst_registry_unload_plugin
                                                (GstRegistry *registry,
                                                 GstPlugin *plugin);

Unload the plugin from the given registry.

`registry` : | the registry to unload the plugin from
`plugin` : | the plugin to unload
Returns : | a value indicating the result

### gst_registry_update_plugin ()

    GstRegistryReturn gst_registry_update_plugin
                                                (GstRegistry *registry,
                                                 GstPlugin *plugin);

Update the plugin in the given registry.

`registry` : | the registry to update
`plugin` : | the plugin to update
Returns : | a value indicating the result

## See Also

GstPlugin, GstPluginFeature