generate local candidates for later use

Author: xhs

python/crtcdc.pxd

@@ -45,6 +45,9 @@ cdef extern from "rtcdc.h":
   char * \
   rtcdc_generate_offer_sdp(rtcdc_peer_connection *peer)
 
+  char * \
+  rtcdc_generate_local_candidate_sdp(rtcdc_peer_connection *peer)
+
   int \
   rtcdc_parse_offer_sdp(rtcdc_peer_connection *peer, const char *offer)
 

python/pyrtcdc.pyx

@@ -147,6 +147,9 @@ cdef class PeerConnectionBase:
   def generate_offer(self):
     return crtcdc.rtcdc_generate_offer_sdp(self._peer)
 
+  def generate_local_candidates(self):
+    return crtcdc.rtcdc_generate_local_candidate_sdp(self._peer)
+
   def parse_offer(self, char *offer):
     return crtcdc.rtcdc_parse_offer_sdp(self._peer, offer)
 

src/rtcdc.c

@@ -172,6 +172,19 @@ rtcdc_generate_offer_sdp(struct rtcdc_peer_connection *peer)
   return generate_local_sdp(peer->transport, client);
 }
 
+char *
+rtcdc_generate_local_candidate_sdp(struct rtcdc_peer_connection *peer)
+{
+  if (peer == NULL)
+    return NULL;
+
+  if (peer->transport == NULL) {
+    if (create_rtcdc_transport(peer, RTCDC_PEER_ROLE_CLIENT) < 0)
+      return NULL;
+  }
+  return generate_local_candidate_sdp(peer->transport);
+}
+
 int
 rtcdc_parse_offer_sdp(struct rtcdc_peer_connection *peer, const char *offer)
 {

src/rtcdc.h

@@ -101,6 +101,9 @@ rtcdc_destroy_peer_connection(struct rtcdc_peer_connection *peer);
 char *
 rtcdc_generate_offer_sdp(struct rtcdc_peer_connection *peer);
 
+char *
+rtcdc_generate_local_candidate_sdp(struct rtcdc_peer_connection *peer);
+
 int
 rtcdc_parse_offer_sdp(struct rtcdc_peer_connection *peer, const char *offer);
 

src/sdp.c

@@ -65,6 +65,29 @@ generate_local_sdp(struct rtcdc_transport *transport, int client)
   return strndup(buf, pos);
 }
 
+char *
+generate_local_candidate_sdp(struct rtcdc_transport *transport)
+{
+  if (transport == NULL || transport->ice == NULL)
+    return NULL;
+
+  char buf[BUFFER_SIZE];
+  memset(buf, 0, sizeof buf);
+
+  gchar *lsdp = nice_agent_generate_local_sdp(transport->ice->agent);
+  gchar **lines = g_strsplit(lsdp, "\n", 0);
+  g_free(lsdp);
+  int pos = 0;
+  for (int i = 0; lines && lines[i]; ++i) {
+    if (g_str_has_prefix(lines[i], "a=candidate:")) {
+      pos += sprintf(buf + pos, "%s\r\n", lines[i]);
+    }
+  }
+  g_strfreev(lines);
+
+  return strndup(buf, pos);
+}
+
 int
 parse_remote_sdp(struct ice_transport *ice, const char *rsdp)
 {

src/sdp.h

@@ -15,6 +15,9 @@ struct ice_transport;
 char *
 generate_local_sdp(struct rtcdc_transport *transport, int client);
 
+char *
+generate_local_candidate_sdp(struct rtcdc_transport *transport);
+
 int
 parse_remote_sdp(struct ice_transport *ice, const char *rsdp);