diff --git a/api/source/mk_common.cpp b/api/source/mk_common.cpp
index c50971fe..4c5b5b9e 100644
--- a/api/source/mk_common.cpp
+++ b/api/source/mk_common.cpp
@@ -292,9 +292,8 @@ API_EXPORT void API_CALL mk_webrtc_get_answer_sdp(void *user_data, on_mk_webrtc_
     std::string offer_str = offer;
     WebRtcPluginManager::Instance().getAnswerSdp(*session, type, WebRtcArgsUrl(url),
                                                  [offer_str, session, user_data, cb](const WebRtcInterface &exchanger) mutable {
-        std::string sdp_answer;
         try {
-            sdp_answer = const_cast<WebRtcInterface &>(exchanger).getAnswerSdp(offer_str);
+            auto sdp_answer = const_cast<WebRtcInterface &>(exchanger).getAnswerSdp(offer_str);
             cb(user_data, sdp_answer.data(), nullptr);
         } catch (std::exception &ex) {
             cb(user_data, nullptr, ex.what());
diff --git a/src/Rtp/RtpSender.cpp b/src/Rtp/RtpSender.cpp
index 9f6f8552..57b28cca 100644
--- a/src/Rtp/RtpSender.cpp
+++ b/src/Rtp/RtpSender.cpp
@@ -61,8 +61,9 @@ void RtpSender::startSend(const MediaSourceEvent::SendRtpArgs &args, const funct
             }
             // tcp服务器默认开启5秒
             auto delay_task = _poller->doDelayTask(_args.tcp_passive_close_delay_ms, [tcp_listener, cb,is_wait]() mutable {
-                if(is_wait)
+                if (is_wait) {
                     cb(0, SockException(Err_timeout, "wait tcp connection timeout"));
+                }
                 tcp_listener = nullptr;
                 return 0;
             });
@@ -75,12 +76,13 @@ void RtpSender::startSend(const MediaSourceEvent::SendRtpArgs &args, const funct
                 delay_task->cancel();
                 strong_self->_socket_rtp = sock;
                 strong_self->onConnect();
-                if(is_wait)
+                if (is_wait) {
                     cb(sock->get_local_port(), SockException());
+                }
                 InfoL << "accept connection from:" << sock->get_peer_ip() << ":" << sock->get_peer_port();
             });
             InfoL << "start tcp passive server on:" << tcp_listener->get_local_port();
-            if(!is_wait){
+            if (!is_wait) {
                 // 随机端口马上返回端口，保证调用者知道端口
                 cb(tcp_listener->get_local_port(), SockException());
             }