防止重复添加RtcpContext

src/Rtsp/RtspPlayer.cpp

@@ -203,6 +203,7 @@ void RtspPlayer::handleResDESCRIBE(const Parser& parser) {
     if (!onCheckSDP(sdpParser.toString())) {
         throw std::runtime_error("onCheckSDP faied");
     }
+    _rtcp_context.clear();
     for (auto &track : _sdp_track) {
         _rtcp_context.emplace_back(std::make_shared<RtcpContext>(track->_samplerate, true));
     }

src/Rtsp/RtspPusher.cpp

@@ -176,6 +176,7 @@ void RtspPusher::sendAnnounce() {
     if (_track_vec.empty()) {
         throw std::runtime_error("无有效的Sdp Track");
     }
+    _rtcp_context.clear();
     for (auto &track : _track_vec) {
         _rtcp_context.emplace_back(std::make_shared<RtcpContext>(track->_samplerate, false));
     }

src/Rtsp/RtspSession.cpp

@@ -406,6 +406,7 @@ void RtspSession::onAuthSuccess() {
             strongSelf->shutdown(SockException(Err_shutdown,"can not find any available track in sdp"));
             return;
         }
+        strongSelf->_rtcp_context.clear();
         for (auto &track : strongSelf->_sdp_track) {
             strongSelf->_rtcp_context.emplace_back(std::make_shared<RtcpContext>(track->_samplerate, false));
         }