修复ssrc变化时端口变化的问题

src/main/java/com/genersoft/iot/vmp/media/zlm/ZLMRTPServerFactory.java

@@ -87,7 +87,7 @@ public class ZLMRTPServerFactory {
         return result;
     }
 
-    public int createRTPServer(MediaServerItem mediaServerItem, String streamId, int ssrc) {
+    public int createRTPServer(MediaServerItem mediaServerItem, String streamId, int ssrc, Integer port) {
         int result = -1;
         // 查询此rtp server 是否已经存在
         JSONObject rtpInfo = zlmresTfulUtils.getRtpInfo(mediaServerItem, streamId);
@@ -105,7 +105,11 @@ public class ZLMRTPServerFactory {
         param.put("enable_tcp", 1);
         param.put("stream_id", streamId);
         // 推流端口设置0则使用随机端口
-        param.put("port", 0);
+        if (port == null) {
+            param.put("port", 0);
+        }else {
+            param.put("port", port);
+        }
         param.put("ssrc", ssrc);
         JSONObject openRtpServerResultJson = zlmresTfulUtils.openRtpServer(mediaServerItem, param);