Add accessor to get the default local candidate for an ICE check list.

include/mediastreamer2/ice.h

@@ -357,13 +357,21 @@ MS2_PUBLIC const char * ice_check_list_remote_ufrag(IceCheckList *cl);
  */
 MS2_PUBLIC const char * ice_check_list_remote_pwd(IceCheckList *cl);
 
+/**
+ * Get the default local candidate for an ICE check list.
+ *
+ * @param cl A pointer to a check list
+ * @return A pointer to the default local candidate for the check list if found, NULL otherwise
+ */
+MS2_PUBLIC const IceCandidate * ice_check_list_default_local_candidate(IceCheckList *cl);
+
 /**
  * Get the candidate type as a string.
  *
  * @param candidate A pointer to a candidate
  * @return A pointer to the candidate type as a string
  */
-MS2_PUBLIC const char *ice_candidate_type(IceCandidate *candidate);
+MS2_PUBLIC const char * ice_candidate_type(const IceCandidate *candidate);
 
 /**
  * Add a local candidate to an ICE check list.

src/ice.c

@@ -306,7 +306,7 @@ void ice_check_list_destroy(IceCheckList *cl)
  * CANDIDATE ACCESSORS                                                        *
  *****************************************************************************/
 
-const char *ice_candidate_type(IceCandidate *candidate)
+const char *ice_candidate_type(const IceCandidate *candidate)
 {
 	return candidate_type_values[candidate->type];
 }
@@ -366,6 +366,21 @@ const char * ice_check_list_remote_pwd(IceCheckList *cl)
 	else return cl->session->remote_pwd;
 }
 
+static int ice_find_default_local_candidate(IceCandidate *candidate, void *dummy)
+{
+	return !((candidate->componentID == 1) && (candidate->is_default == TRUE));
+}
+
+const IceCandidate * ice_check_list_default_local_candidate(IceCheckList *cl)
+{
+	IceCandidate *candidate = NULL;
+	MSList *elem = ms_list_find_custom(cl->local_candidates, (MSCompareFunc)ice_find_default_local_candidate, NULL);
+	if (elem != NULL) {
+		candidate = (IceCandidate *)elem->data;
+	}
+	return candidate;
+}
+
 void ice_check_list_set_remote_credentials(IceCheckList *cl, const char *ufrag, const char *pwd)
 {
 	ice_set_credentials(&cl->remote_ufrag, &cl->remote_pwd, ufrag, pwd);