sdpops: support for codecs with same name and many different ids

- reported by Juha Heinanen

modules/sdpops/sdpops_data.c

@@ -138,17 +138,19 @@ int sdpops_get_ids_by_name(str *name, str *ids)
 }
 
 /**
- * get codec ID from a= line based on name
+ * get codec IDs from a= lines based on name
  */
-int sdpops_sdp_get_ids_by_name(sdp_info_t *sdp, str *cname, str *cid)
+int sdpops_sdp_get_ids_by_name(sdp_info_t *sdp, str *cname, str *cids, int n)
 {
 	int sdp_session_num;
 	int sdp_stream_num;
 	sdp_session_cell_t *sdp_session;
 	sdp_stream_cell_t *sdp_stream;
 	sdp_payload_attr_t *sdp_payload;
+	int i;
 
 	sdp_session_num = 0;
+	i = 0;
 	for(;;)
 	{
 		sdp_session = get_sdp_session_sdp(sdp, sdp_session_num);
@@ -165,8 +167,10 @@ int sdpops_sdp_get_ids_by_name(sdp_info_t *sdp, str *cname, str *cid)
 						&& strncasecmp(cname->s, sdp_payload->rtp_enc.s,
 								cname->len)==0)
 				{
-					*cid = sdp_payload->rtp_payload;
-					return 0;
+					if(i==n)
+						goto notfound;
+					cids[i] = sdp_payload->rtp_payload;
+					i++;
 				}
 
 				sdp_payload=sdp_payload->next;
@@ -176,8 +180,15 @@ int sdpops_sdp_get_ids_by_name(sdp_info_t *sdp, str *cname, str *cid)
 		sdp_session_num++;
 	}
 
-	cid->s = NULL;
-	cid->len = 0;
+	if(i==0)
+		goto notfound;
+	if(i<n)
+		cids[i].s = NULL;
+	return 0;
+
+notfound:
+	cids[0].s = NULL;
+	cids[0].len = 0;
 	return -1;
 }
 
@@ -190,8 +201,10 @@ int sdpops_build_ids_list(sdp_info_t *sdp, str *names, str *ids)
 	static char _local_idslist[SDPOPS_MAX_LIST_SIZE];
 	str tmp;
 	str codec;
-	str cids;
+#define SDPOPS_CIDS_SIZE	8
+	str cids[SDPOPS_CIDS_SIZE];
 	char *p;
+	int i;
 
 	tmp = *names;
 	ids->len = 0;
@@ -203,33 +216,34 @@ int sdpops_build_ids_list(sdp_info_t *sdp, str *names, str *ids)
 		tmp.len -= (int)(&codec.s[codec.len]-codec.s);
 		tmp.s = codec.s + codec.len;
 
-		cids.s = NULL;
-		if(sdpops_get_ids_by_name(&codec, &cids)==0) {
+		cids[0].s = NULL;
+		if(sdpops_get_ids_by_name(&codec, &cids[0])==0) {
 			LM_DBG("codecs list [%.*s] - at name [%.*s] with list ids [%.*s]\n",
 				names->len, names->s,
 				codec.len, codec.s,
-				cids.len,  cids.s);
+				cids[0].len,  cids[0].s);
+			cids[1].s = NULL;
 		} else {
-			if(sdpops_sdp_get_ids_by_name(sdp, &codec, &cids)==0) {
-				LM_DBG("codecs list [%.*s] - at name [%.*s] with sdp id [%.*s]\n",
+			if(sdpops_sdp_get_ids_by_name(sdp, &codec, cids, SDPOPS_CIDS_SIZE)==0) {
+				LM_DBG("codecs list [%.*s] - at name [%.*s] with first sdp id [%.*s]\n",
 					names->len, names->s,
 					codec.len, codec.s,
-					cids.len,  cids.s);
+					cids[0].len,  cids[0].s);
 			}
 		}
-		if(cids.s!=NULL) {
-			if(ids->len + cids.len>=SDPOPS_MAX_LIST_SIZE)
+		for(i=0; i<SDPOPS_CIDS_SIZE && cids[i].s!=NULL; i++) {
+			if(ids->len + cids[i].len>=SDPOPS_MAX_LIST_SIZE)
 			{
 				LM_ERR("the list with codecs ids is too big\n");
 				ids->len = 0;
 				ids->s = 0;
 				return -1;
 			}
-			strncpy(p, cids.s, cids.len);
-			p += cids.len;
+			strncpy(p, cids[i].s, cids[i].len);
+			p += cids[i].len;
 			*p = ',';
 			p++;
-			ids->len += cids.len + 1;
+			ids->len += cids[i].len + 1;
 		}
 	}
 	if(ids->len>0)