registry: API: Add gst_{default,}_registry_get_feature_list_cookie()

This returns the internal feature list cookie, which changes every
time a feature is added or removed. This can be used by elements
to check if they should update their cached feature lists.

1 files changed, 18 insertions, 0 deletions

diff --git a/gst/gstregistry.c b/gst/gstregistry.c
index 56f4744a34..b63d886f21 100644
--- a/gst/gstregistry.c
+++ b/gst/gstregistry.c
@@ -1653,3 +1653,21 @@ gst_update_registry (void)
 
   return res;
 }
+
+/**
+ * gst_registry_get_feature_list_cookie:
+ *
+ * Returns the registrys feature list cookie. This changes
+ * every time a feature is added or removed from the registry.
+ *
+ * Returns: the feature list cookie.
+ *
+ * Since: 0.10.26
+ */
+guint32
+gst_registry_get_feature_list_cookie (GstRegistry * registry)
+{
+  g_return_val_if_fail (GST_IS_REGISTRY (registry), 0);
+
+  return registry->priv->cookie;
+}