diff --git a/trunk/src/app/srs_app_listener.cpp b/trunk/src/app/srs_app_listener.cpp
index a88bf1af3..9f93b2cf8 100755
--- a/trunk/src/app/srs_app_listener.cpp
+++ b/trunk/src/app/srs_app_listener.cpp
@@ -428,9 +428,9 @@ srs_error_t SrsUdpMuxListener::cycle()
             return srs_error_wrap(err, "udp listener");
         }   
 
-        SrsUdpMuxSocket udp_mux_skt(lfd);
+        SrsUdpMuxSocket skt(lfd);
 
-        int nread = udp_mux_skt.recvfrom(SRS_UTIME_NO_TIMEOUT);
+        int nread = skt.recvfrom(SRS_UTIME_NO_TIMEOUT);
         if (nread <= 0) {
             if (nread < 0) {
                 srs_warn("udp recv error");
@@ -439,7 +439,7 @@ srs_error_t SrsUdpMuxListener::cycle()
             continue;
         }   
     
-        if ((err = handler->on_udp_packet(&udp_mux_skt)) != srs_success) {
+        if ((err = handler->on_udp_packet(&skt)) != srs_success) {
             // remux udp never return
             srs_warn("udp packet handler error:%s", srs_error_desc(err).c_str());
             continue;
diff --git a/trunk/src/app/srs_app_listener.hpp b/trunk/src/app/srs_app_listener.hpp
index 0222413c1..78db998bd 100644
--- a/trunk/src/app/srs_app_listener.hpp
+++ b/trunk/src/app/srs_app_listener.hpp
@@ -69,7 +69,7 @@ public:
     virtual ~ISrsUdpMuxHandler();
 public:
     virtual srs_error_t on_stfd_change(srs_netfd_t fd);
-    virtual srs_error_t on_udp_packet(SrsUdpMuxSocket* udp_mux_skt) = 0;
+    virtual srs_error_t on_udp_packet(SrsUdpMuxSocket* skt) = 0;
 };
 
 // The tcp connection handler.
diff --git a/trunk/src/app/srs_app_rtc_conn.cpp b/trunk/src/app/srs_app_rtc_conn.cpp
index bdcc8c705..da3a4fc2f 100644
--- a/trunk/src/app/srs_app_rtc_conn.cpp
+++ b/trunk/src/app/srs_app_rtc_conn.cpp
@@ -174,7 +174,7 @@ srs_error_t SrsDtlsSession::initialize(const SrsRequest& req)
     return err;
 }
 
-srs_error_t SrsDtlsSession::handshake(SrsUdpMuxSocket* udp_mux_skt)
+srs_error_t SrsDtlsSession::handshake(SrsUdpMuxSocket* skt)
 {
     srs_error_t err = srs_success;
 
@@ -186,7 +186,7 @@ srs_error_t SrsDtlsSession::handshake(SrsUdpMuxSocket* udp_mux_skt)
     int ssl_err = SSL_get_error(dtls, ret); 
     switch(ssl_err) {   
         case SSL_ERROR_NONE: {   
-            if ((err = on_dtls_handshake_done(udp_mux_skt)) != srs_success) {
+            if ((err = on_dtls_handshake_done(skt)) != srs_success) {
                 return srs_error_wrap(err, "dtls handshake done handle");
             }
             break;
@@ -206,7 +206,7 @@ srs_error_t SrsDtlsSession::handshake(SrsUdpMuxSocket* udp_mux_skt)
     }   
 
     if (out_bio_len) {   
-        if ((err = udp_mux_skt->sendto(out_bio_data, out_bio_len, 0)) != srs_success) {
+        if ((err = skt->sendto(out_bio_data, out_bio_len, 0)) != srs_success) {
             return srs_error_wrap(err, "send dtls packet");
         }
     }
@@ -214,7 +214,7 @@ srs_error_t SrsDtlsSession::handshake(SrsUdpMuxSocket* udp_mux_skt)
     return err;
 }
 
-srs_error_t SrsDtlsSession::on_dtls(SrsUdpMuxSocket* udp_mux_skt)
+srs_error_t SrsDtlsSession::on_dtls(SrsUdpMuxSocket* skt)
 {
     srs_error_t err = srs_success;
     if (BIO_reset(bio_in) != 1) {
@@ -224,13 +224,13 @@ srs_error_t SrsDtlsSession::on_dtls(SrsUdpMuxSocket* udp_mux_skt)
         return srs_error_new(ERROR_OpenSslBIOReset, "BIO_reset");
     }
 
-    if (BIO_write(bio_in, udp_mux_skt->data(), udp_mux_skt->size()) <= 0) {
+    if (BIO_write(bio_in, skt->data(), skt->size()) <= 0) {
         // TODO: 0 or -1 maybe block, use BIO_should_retry to check.
         return srs_error_new(ERROR_OpenSslBIOWrite, "BIO_write");
     }
 
     if (! handshake_done) {
-        err = handshake(udp_mux_skt);
+        err = handshake(skt);
     } else {
         while (BIO_ctrl_pending(bio_in) > 0) {
             char dtls_read_buf[8092];
@@ -247,7 +247,7 @@ srs_error_t SrsDtlsSession::on_dtls(SrsUdpMuxSocket* udp_mux_skt)
     return err;
 }
 
-srs_error_t SrsDtlsSession::on_dtls_handshake_done(SrsUdpMuxSocket* udp_mux_skt)
+srs_error_t SrsDtlsSession::on_dtls_handshake_done(SrsUdpMuxSocket* skt)
 {
     srs_error_t err = srs_success;
     srs_trace("dtls handshake done");
@@ -257,7 +257,7 @@ srs_error_t SrsDtlsSession::on_dtls_handshake_done(SrsUdpMuxSocket* udp_mux_skt)
         return srs_error_wrap(err, "srtp init failed");
     }
 
-    return rtc_session->on_connection_established(udp_mux_skt);
+    return rtc_session->on_connection_established(skt);
 }
 
 srs_error_t SrsDtlsSession::on_dtls_application_data(const char* buf, const int nb_buf)
@@ -529,13 +529,6 @@ srs_error_t SrsRtcSenderThread::cycle()
             return srs_error_wrap(err, "rtc sender thread");
         }
 
-        pprint->elapse();
-
-        if (pprint->can_print()) {
-            // TODO: FIXME:
-            // Print stat like frame/s, packet/s, loss_packets.
-        } 
-
 #ifdef SRS_PERF_QUEUE_COND_WAIT
         if (realtime) {
             // for realtime, min required msgs is 0, send when got one+ msgs.
@@ -559,20 +552,28 @@ srs_error_t SrsRtcSenderThread::cycle()
             continue;
         }
 
-        send_and_free_messages(msgs.msgs, msg_count, sendonly_ukt);
+        int nn = 0;
+        int nn_rtp_pkts = 0;
+        send_and_free_messages(msgs.msgs, msg_count, sendonly_ukt, &nn, &nn_rtp_pkts);
+
+        pprint->elapse();
+        if (pprint->can_print()) {
+            // TODO: FIXME: Print stat like frame/s, packet/s, loss_packets.
+            srs_trace("-> RTC PLAY %d msgs, %d packets, %d bytes", msg_count, nn_rtp_pkts, nn);
+        }
     }
 }
 
-void SrsRtcSenderThread::update_sendonly_socket(SrsUdpMuxSocket* ukt) 
+void SrsRtcSenderThread::update_sendonly_socket(SrsUdpMuxSocket* skt)
 {
     srs_trace("session %s address changed, update %s -> %s", 
-        rtc_session->id().c_str(), sendonly_ukt->get_peer_id().c_str(), ukt->get_peer_id().c_str());
+        rtc_session->id().c_str(), sendonly_ukt->get_peer_id().c_str(), skt->get_peer_id().c_str());
 
     srs_freep(sendonly_ukt);
-    sendonly_ukt = ukt->copy_sendonly();
+    sendonly_ukt = skt->copy_sendonly();
 }
 
-void SrsRtcSenderThread::send_and_free_messages(SrsSharedPtrMessage** msgs, int nb_msgs, SrsUdpMuxSocket* udp_mux_skt)
+void SrsRtcSenderThread::send_and_free_messages(SrsSharedPtrMessage** msgs, int nb_msgs, SrsUdpMuxSocket* skt, int* pnn, int* pnn_rtp_pkts)
 {
     if (!rtc_session->dtls_session) {
         return;
@@ -583,16 +584,20 @@ void SrsRtcSenderThread::send_and_free_messages(SrsSharedPtrMessage** msgs, int
         bool is_video = msg->is_video();
         bool is_audio = msg->is_audio();
 
-        for (vector<SrsRtpSharedPacket*>::iterator it = msg->rtp_packets.begin(); it != msg->rtp_packets.end(); ++it) {
-            SrsRtpSharedPacket* pkt = *it;
-            send_and_free_message(msg, is_video, is_audio, pkt, udp_mux_skt);
+        int nn_rtp_pkts = (int)msg->rtp_packets.size();
+        for (int j = 0; j < nn_rtp_pkts; j++) {
+            SrsRtpSharedPacket* pkt = msg->rtp_packets[j];
+            send_and_free_message(msg, is_video, is_audio, pkt, skt);
         }
 
+        *pnn += msg->size;
+        *pnn_rtp_pkts += nn_rtp_pkts;
+
         srs_freep(msg);
     }
 }
 
-void SrsRtcSenderThread::send_and_free_message(SrsSharedPtrMessage* msg, bool is_video, bool is_audio, SrsRtpSharedPacket* pkt, SrsUdpMuxSocket* udp_mux_skt)
+void SrsRtcSenderThread::send_and_free_message(SrsSharedPtrMessage* msg, bool is_video, bool is_audio, SrsRtpSharedPacket* pkt, SrsUdpMuxSocket* skt)
 {
     srs_error_t err = srs_success;
 
@@ -620,15 +625,15 @@ void SrsRtcSenderThread::send_and_free_message(SrsSharedPtrMessage* msg, bool is
         memcpy(buf, pkt->payload, length);
     }
 
-    sockaddr_in* addr = (sockaddr_in*)udp_mux_skt->peer_addr();
-    socklen_t addrlen = (socklen_t)udp_mux_skt->peer_addrlen();
+    sockaddr_in* addr = (sockaddr_in*)skt->peer_addr();
+    socklen_t addrlen = (socklen_t)skt->peer_addrlen();
 
     mhdr->msg_hdr.msg_name = (sockaddr_in*)addr;
     mhdr->msg_hdr.msg_namelen = (socklen_t)addrlen;
     mhdr->msg_hdr.msg_iov->iov_len = length;
     mhdr->msg_len = 0;
 
-    rtc_session->rtc_server->sendmmsg(udp_mux_skt->stfd(), mhdr);
+    rtc_session->rtc_server->sendmmsg(skt->stfd(), mhdr);
 }
 
 SrsRtcSession::SrsRtcSession(SrsRtcServer* rtc_svr, const SrsRequest& req, const std::string& un, int context_id)
@@ -673,12 +678,12 @@ void SrsRtcSession::switch_to_context()
     _srs_context->set_id(cid);
 }
 
-srs_error_t SrsRtcSession::on_stun(SrsUdpMuxSocket* udp_mux_skt, SrsStunPacket* stun_req)
+srs_error_t SrsRtcSession::on_stun(SrsUdpMuxSocket* skt, SrsStunPacket* stun_req)
 {
     srs_error_t err = srs_success;
 
     if (stun_req->is_binding_request()) {
-        if ((err = on_binding_request(udp_mux_skt, stun_req)) != srs_success) {
+        if ((err = on_binding_request(skt, stun_req)) != srs_success) {
             return srs_error_wrap(err, "stun binding request failed");
         }
 
@@ -687,8 +692,8 @@ srs_error_t SrsRtcSession::on_stun(SrsUdpMuxSocket* udp_mux_skt, SrsStunPacket*
         if (strd && strd->sendonly_ukt) {
             // We are running in the ice-lite(server) mode. If client have multi network interface,
             // we only choose one candidate pair which is determined by client.
-            if (stun_req->get_use_candidate() && strd->sendonly_ukt->get_peer_id() != udp_mux_skt->get_peer_id()) {
-                strd->update_sendonly_socket(udp_mux_skt);
+            if (stun_req->get_use_candidate() && strd->sendonly_ukt->get_peer_id() != skt->get_peer_id()) {
+                strd->update_sendonly_socket(skt);
             }
         }
     }
@@ -718,7 +723,7 @@ srs_error_t SrsRtcSession::check_source()
 #define be32toh ntohl
 #endif
 
-srs_error_t SrsRtcSession::on_binding_request(SrsUdpMuxSocket* udp_mux_skt, SrsStunPacket* stun_req)
+srs_error_t SrsRtcSession::on_binding_request(SrsUdpMuxSocket* skt, SrsStunPacket* stun_req)
 {
     srs_error_t err = srs_success;
 
@@ -739,28 +744,28 @@ srs_error_t SrsRtcSession::on_binding_request(SrsUdpMuxSocket* udp_mux_skt, SrsS
     stun_binding_response.set_remote_ufrag(stun_req->get_local_ufrag());
     stun_binding_response.set_transcation_id(stun_req->get_transcation_id());
     // FIXME: inet_addr is deprecated, IPV6 support
-    stun_binding_response.set_mapped_address(be32toh(inet_addr(udp_mux_skt->get_peer_ip().c_str())));
-    stun_binding_response.set_mapped_port(udp_mux_skt->get_peer_port());
+    stun_binding_response.set_mapped_address(be32toh(inet_addr(skt->get_peer_ip().c_str())));
+    stun_binding_response.set_mapped_port(skt->get_peer_port());
 
     if ((err = stun_binding_response.encode(get_local_sdp()->get_ice_pwd(), stream)) != srs_success) {
         return srs_error_wrap(err, "stun binding response encode failed");
     }
 
-    if ((err = udp_mux_skt->sendto(stream->data(), stream->pos(), 0)) != srs_success) {
+    if ((err = skt->sendto(stream->data(), stream->pos(), 0)) != srs_success) {
         return srs_error_wrap(err, "stun binding response send failed");
     }
 
     if (get_session_state() == WAITING_STUN) {
         set_session_state(DOING_DTLS_HANDSHAKE);
 
-        peer_id = udp_mux_skt->get_peer_id();
+        peer_id = skt->get_peer_id();
         rtc_server->insert_into_id_sessions(peer_id, this);
     }
 
     return err;
 }
 
-srs_error_t SrsRtcSession::on_rtcp_feedback(char* buf, int nb_buf, SrsUdpMuxSocket* udp_mux_skt)
+srs_error_t SrsRtcSession::on_rtcp_feedback(char* buf, int nb_buf, SrsUdpMuxSocket* skt)
 {
     srs_error_t err = srs_success;
 
@@ -845,14 +850,14 @@ srs_error_t SrsRtcSession::on_rtcp_feedback(char* buf, int nb_buf, SrsUdpMuxSock
             srs_verbose("resend pkt sequence=%u", resend_pkts[i]->rtp_header.get_sequence());
 
             dtls_session->protect_rtp(protected_buf, resend_pkts[i]->payload, nb_protected_buf);
-            udp_mux_skt->sendto(protected_buf, nb_protected_buf, 0);
+            skt->sendto(protected_buf, nb_protected_buf, 0);
         }
     }
 
     return err;
 }
 
-srs_error_t SrsRtcSession::on_rtcp_ps_feedback(char* buf, int nb_buf, SrsUdpMuxSocket* udp_mux_skt)
+srs_error_t SrsRtcSession::on_rtcp_ps_feedback(char* buf, int nb_buf, SrsUdpMuxSocket* skt)
 {
     srs_error_t err = srs_success;
 
@@ -899,7 +904,7 @@ srs_error_t SrsRtcSession::on_rtcp_ps_feedback(char* buf, int nb_buf, SrsUdpMuxS
     return err;
 }
 
-srs_error_t SrsRtcSession::on_rtcp_receiver_report(char* buf, int nb_buf, SrsUdpMuxSocket* udp_mux_skt)
+srs_error_t SrsRtcSession::on_rtcp_receiver_report(char* buf, int nb_buf, SrsUdpMuxSocket* skt)
 {
     srs_error_t err = srs_success;
 
@@ -968,18 +973,18 @@ block  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     return err;
 }
 
-srs_error_t SrsRtcSession::on_connection_established(SrsUdpMuxSocket* udp_mux_skt)
+srs_error_t SrsRtcSession::on_connection_established(SrsUdpMuxSocket* skt)
 {
     srs_trace("rtc session=%s, to=%dms connection established", id().c_str(), srsu2msi(sessionStunTimeout));
-    return start_play(udp_mux_skt);
+    return start_play(skt);
 }
 
-srs_error_t SrsRtcSession::start_play(SrsUdpMuxSocket* udp_mux_skt)
+srs_error_t SrsRtcSession::start_play(SrsUdpMuxSocket* skt)
 {
     srs_error_t err = srs_success;
 
     srs_freep(strd);
-    strd = new SrsRtcSenderThread(this, udp_mux_skt, _srs_context->get_id());
+    strd = new SrsRtcSenderThread(this, skt, _srs_context->get_id());
 
     uint32_t video_ssrc = 0;
     uint32_t audio_ssrc = 0;
@@ -1012,12 +1017,12 @@ bool SrsRtcSession::is_stun_timeout()
     return last_stun_time + sessionStunTimeout < srs_get_system_time();
 }
 
-srs_error_t SrsRtcSession::on_dtls(SrsUdpMuxSocket* udp_mux_skt)
+srs_error_t SrsRtcSession::on_dtls(SrsUdpMuxSocket* skt)
 {
-    return dtls_session->on_dtls(udp_mux_skt);
+    return dtls_session->on_dtls(skt);
 }
 
-srs_error_t SrsRtcSession::on_rtcp(SrsUdpMuxSocket* udp_mux_skt)
+srs_error_t SrsRtcSession::on_rtcp(SrsUdpMuxSocket* skt)
 {
     srs_error_t err = srs_success;
 
@@ -1026,8 +1031,8 @@ srs_error_t SrsRtcSession::on_rtcp(SrsUdpMuxSocket* udp_mux_skt)
     }
 
     char unprotected_buf[kRtpPacketSize];
-    int nb_unprotected_buf = udp_mux_skt->size();
-    if ((err = dtls_session->unprotect_rtcp(unprotected_buf, udp_mux_skt->data(), nb_unprotected_buf)) != srs_success) {
+    int nb_unprotected_buf = skt->size();
+    if ((err = dtls_session->unprotect_rtcp(unprotected_buf, skt->data(), nb_unprotected_buf)) != srs_success) {
         return srs_error_wrap(err, "rtcp unprotect failed");
     }
 
@@ -1050,7 +1055,7 @@ srs_error_t SrsRtcSession::on_rtcp(SrsUdpMuxSocket* udp_mux_skt)
                 break;
             }
             case kRR: {
-                err = on_rtcp_receiver_report(ph, length, udp_mux_skt);
+                err = on_rtcp_receiver_report(ph, length, skt);
                 break;
             }
             case kSDES: {
@@ -1063,11 +1068,11 @@ srs_error_t SrsRtcSession::on_rtcp(SrsUdpMuxSocket* udp_mux_skt)
                 break;
             }
             case kRtpFb: {
-                err = on_rtcp_feedback(ph, length, udp_mux_skt);
+                err = on_rtcp_feedback(ph, length, skt);
                 break;
             }
             case kPsFb: {
-                err = on_rtcp_ps_feedback(ph, length, udp_mux_skt);
+                err = on_rtcp_ps_feedback(ph, length, skt);
                 break;
             }
             default:{
@@ -1170,14 +1175,14 @@ srs_error_t SrsRtcServer::listen_udp()
     return err;
 }
 
-srs_error_t SrsRtcServer::on_udp_packet(SrsUdpMuxSocket* udp_mux_skt)
+srs_error_t SrsRtcServer::on_udp_packet(SrsUdpMuxSocket* skt)
 {
-    if (is_stun(reinterpret_cast<const uint8_t*>(udp_mux_skt->data()), udp_mux_skt->size())) {
-        return on_stun(udp_mux_skt);
-    } else if (is_dtls(reinterpret_cast<const uint8_t*>(udp_mux_skt->data()), udp_mux_skt->size())) {
-        return on_dtls(udp_mux_skt);
-    } else if (is_rtp_or_rtcp(reinterpret_cast<const uint8_t*>(udp_mux_skt->data()), udp_mux_skt->size())) {
-        return on_rtp_or_rtcp(udp_mux_skt);
+    if (is_stun(reinterpret_cast<const uint8_t*>(skt->data()), skt->size())) {
+        return on_stun(skt);
+    } else if (is_dtls(reinterpret_cast<const uint8_t*>(skt->data()), skt->size())) {
+        return on_dtls(skt);
+    } else if (is_rtp_or_rtcp(reinterpret_cast<const uint8_t*>(skt->data()), skt->size())) {
+        return on_rtp_or_rtcp(skt);
     } 
 
     return srs_error_new(ERROR_RTC_UDP, "unknown udp packet type");
@@ -1246,17 +1251,17 @@ SrsRtcSession* SrsRtcServer::find_rtc_session_by_peer_id(const string& peer_id)
     return iter->second;
 }
 
-srs_error_t SrsRtcServer::on_stun(SrsUdpMuxSocket* udp_mux_skt)
+srs_error_t SrsRtcServer::on_stun(SrsUdpMuxSocket* skt)
 {
     srs_error_t err = srs_success;
 
     SrsStunPacket stun_req;
-    if ((err = stun_req.decode(udp_mux_skt->data(), udp_mux_skt->size())) != srs_success) {
+    if ((err = stun_req.decode(skt->data(), skt->size())) != srs_success) {
         return srs_error_wrap(err, "decode stun packet failed");
     }
 
     srs_verbose("recv stun packet from %s, use-candidate=%d, ice-controlled=%d, ice-controlling=%d", 
-        udp_mux_skt->get_peer_id().c_str(), stun_req.get_use_candidate(), stun_req.get_ice_controlled(), stun_req.get_ice_controlling());
+        skt->get_peer_id().c_str(), stun_req.get_use_candidate(), stun_req.get_ice_controlled(), stun_req.get_ice_controlling());
 
     std::string username = stun_req.get_username();
     SrsRtcSession* rtc_session = find_rtc_session_by_username(username);
@@ -1268,44 +1273,44 @@ srs_error_t SrsRtcServer::on_stun(SrsUdpMuxSocket* udp_mux_skt)
     // to make all logs write to the "correct" pid+cid.
     rtc_session->switch_to_context();
 
-    return rtc_session->on_stun(udp_mux_skt, &stun_req);
+    return rtc_session->on_stun(skt, &stun_req);
 }
 
-srs_error_t SrsRtcServer::on_dtls(SrsUdpMuxSocket* udp_mux_skt)
+srs_error_t SrsRtcServer::on_dtls(SrsUdpMuxSocket* skt)
 {
-    SrsRtcSession* rtc_session = find_rtc_session_by_peer_id(udp_mux_skt->get_peer_id());
+    SrsRtcSession* rtc_session = find_rtc_session_by_peer_id(skt->get_peer_id());
 
     if (rtc_session == NULL) {
-        return srs_error_new(ERROR_RTC_DTLS, "can not find rtc session by peer_id=%s", udp_mux_skt->get_peer_id().c_str());
+        return srs_error_new(ERROR_RTC_DTLS, "can not find rtc session by peer_id=%s", skt->get_peer_id().c_str());
     }
 
     // Now, we got the RTC session to handle the packet, switch to its context
     // to make all logs write to the "correct" pid+cid.
     rtc_session->switch_to_context();
 
-    return rtc_session->on_dtls(udp_mux_skt);
+    return rtc_session->on_dtls(skt);
 }
 
-srs_error_t SrsRtcServer::on_rtp_or_rtcp(SrsUdpMuxSocket* udp_mux_skt)
+srs_error_t SrsRtcServer::on_rtp_or_rtcp(SrsUdpMuxSocket* skt)
 {
     srs_error_t err = srs_success;
 
-    SrsRtcSession* rtc_session = find_rtc_session_by_peer_id(udp_mux_skt->get_peer_id());
+    SrsRtcSession* rtc_session = find_rtc_session_by_peer_id(skt->get_peer_id());
 
     if (rtc_session == NULL) {
-        return srs_error_new(ERROR_RTC_RTP, "can not find rtc session by peer_id=%s", udp_mux_skt->get_peer_id().c_str());
+        return srs_error_new(ERROR_RTC_RTP, "can not find rtc session by peer_id=%s", skt->get_peer_id().c_str());
     }
 
     // Now, we got the RTC session to handle the packet, switch to its context
     // to make all logs write to the "correct" pid+cid.
     rtc_session->switch_to_context();
 
-    if (is_rtcp(reinterpret_cast<const uint8_t*>(udp_mux_skt->data()), udp_mux_skt->size())) {
-        err = rtc_session->on_rtcp(udp_mux_skt);
+    if (is_rtcp(reinterpret_cast<const uint8_t*>(skt->data()), skt->size())) {
+        err = rtc_session->on_rtcp(skt);
     } else {
         // We disable it because no RTP for player.
         // see https://github.com/ossrs/srs/blob/018577e685a07d9de7a47354e7a9c5f77f5f4202/trunk/src/app/srs_app_rtc_conn.cpp#L1081
-        // err = rtc_session->on_rtp(udp_mux_skt);
+        // err = rtc_session->on_rtp(skt);
     }
 
     return err;
diff --git a/trunk/src/app/srs_app_rtc_conn.hpp b/trunk/src/app/srs_app_rtc_conn.hpp
index f7cb9137d..f448778b9 100644
--- a/trunk/src/app/srs_app_rtc_conn.hpp
+++ b/trunk/src/app/srs_app_rtc_conn.hpp
@@ -99,8 +99,8 @@ public:
 
     srs_error_t initialize(const SrsRequest& req);
 
-    srs_error_t on_dtls(SrsUdpMuxSocket* udp_mux_skt);
-    srs_error_t on_dtls_handshake_done(SrsUdpMuxSocket* udp_mux_skt);
+    srs_error_t on_dtls(SrsUdpMuxSocket* skt);
+    srs_error_t on_dtls_handshake_done(SrsUdpMuxSocket* skt);
     srs_error_t on_dtls_application_data(const char* data, const int len);
 public:
     srs_error_t protect_rtp(char* protected_buf, const char* ori_buf, int& nb_protected_buf);
@@ -108,7 +108,7 @@ public:
     srs_error_t protect_rtcp(char* protected_buf, const char* ori_buf, int& nb_protected_buf);
     srs_error_t unprotect_rtcp(char* unprotected_buf, const char* ori_buf, int& nb_unprotected_buf);
 private:
-    srs_error_t handshake(SrsUdpMuxSocket* udp_mux_skt);
+    srs_error_t handshake(SrsUdpMuxSocket* skt);
 private:
     srs_error_t srtp_initialize();
     srs_error_t srtp_send_init();
@@ -142,10 +142,10 @@ public:
 public:
     virtual srs_error_t cycle();
 public:
-    void update_sendonly_socket(SrsUdpMuxSocket* ukt);
+    void update_sendonly_socket(SrsUdpMuxSocket* skt);
 private:
-    void send_and_free_messages(SrsSharedPtrMessage** msgs, int nb_msgs, SrsUdpMuxSocket* udp_mux_skt);
-    void send_and_free_message(SrsSharedPtrMessage* msg, bool is_video, bool is_audio, SrsRtpSharedPacket* pkt, SrsUdpMuxSocket* udp_mux_skt);
+    void send_and_free_messages(SrsSharedPtrMessage** msgs, int nb_msgs, SrsUdpMuxSocket* skt, int* pnn, int* pnn_rtp_pkts);
+    void send_and_free_message(SrsSharedPtrMessage* msg, bool is_video, bool is_audio, SrsRtpSharedPacket* pkt, SrsUdpMuxSocket* skt);
 };
 
 class SrsRtcSession
@@ -196,23 +196,23 @@ public:
 
     void switch_to_context();
 public:
-    srs_error_t on_stun(SrsUdpMuxSocket* udp_mux_skt, SrsStunPacket* stun_req);
-    srs_error_t on_dtls(SrsUdpMuxSocket* udp_mux_skt);
-    srs_error_t on_rtcp(SrsUdpMuxSocket* udp_mux_skt);
+    srs_error_t on_stun(SrsUdpMuxSocket* skt, SrsStunPacket* stun_req);
+    srs_error_t on_dtls(SrsUdpMuxSocket* skt);
+    srs_error_t on_rtcp(SrsUdpMuxSocket* skt);
 public:
-    srs_error_t send_client_hello(SrsUdpMuxSocket* udp_mux_skt);
-    srs_error_t on_connection_established(SrsUdpMuxSocket* udp_mux_skt);
-    srs_error_t start_play(SrsUdpMuxSocket* udp_mux_skt);
+    srs_error_t send_client_hello(SrsUdpMuxSocket* skt);
+    srs_error_t on_connection_established(SrsUdpMuxSocket* skt);
+    srs_error_t start_play(SrsUdpMuxSocket* skt);
 public:
     bool is_stun_timeout();
 private:
     srs_error_t check_source();
 private:
-    srs_error_t on_binding_request(SrsUdpMuxSocket* udp_mux_skt, SrsStunPacket* stun_req);
+    srs_error_t on_binding_request(SrsUdpMuxSocket* skt, SrsStunPacket* stun_req);
 private:
-    srs_error_t on_rtcp_feedback(char* buf, int nb_buf, SrsUdpMuxSocket* udp_mux_skt);
-    srs_error_t on_rtcp_ps_feedback(char* buf, int nb_buf, SrsUdpMuxSocket* udp_mux_skt);
-    srs_error_t on_rtcp_receiver_report(char* buf, int nb_buf, SrsUdpMuxSocket* udp_mux_skt);
+    srs_error_t on_rtcp_feedback(char* buf, int nb_buf, SrsUdpMuxSocket* skt);
+    srs_error_t on_rtcp_ps_feedback(char* buf, int nb_buf, SrsUdpMuxSocket* skt);
+    srs_error_t on_rtcp_receiver_report(char* buf, int nb_buf, SrsUdpMuxSocket* skt);
 };
 
 class SrsRtcServer : virtual public ISrsUdpMuxHandler, virtual public ISrsHourGlass,
@@ -247,16 +247,16 @@ public:
     // TODO: FIXME: Support gracefully quit.
     // TODO: FIXME: Support reload.
     virtual srs_error_t listen_udp();
-    virtual srs_error_t on_udp_packet(SrsUdpMuxSocket* udp_mux_skt);
+    virtual srs_error_t on_udp_packet(SrsUdpMuxSocket* skt);
 public:
     virtual srs_error_t listen_api();
     SrsRtcSession* create_rtc_session(const SrsRequest& req, const SrsSdp& remote_sdp, SrsSdp& local_sdp, const std::string& mock_eip);
     bool insert_into_id_sessions(const std::string& peer_id, SrsRtcSession* rtc_session);
     void check_and_clean_timeout_session();
 private:
-    srs_error_t on_stun(SrsUdpMuxSocket* udp_mux_skt);
-    srs_error_t on_dtls(SrsUdpMuxSocket* udp_mux_skt);
-    srs_error_t on_rtp_or_rtcp(SrsUdpMuxSocket* udp_mux_skt);
+    srs_error_t on_stun(SrsUdpMuxSocket* skt);
+    srs_error_t on_dtls(SrsUdpMuxSocket* skt);
+    srs_error_t on_rtp_or_rtcp(SrsUdpMuxSocket* skt);
 private:
     SrsRtcSession* find_rtc_session_by_username(const std::string& ufrag);
     SrsRtcSession* find_rtc_session_by_peer_id(const std::string& peer_id);