rtp服务器单端口模式收到相同ssrc推流时延时关闭RtpSession对象(防止频繁创建销毁对象)

src/Rtp/RtpSelector.cpp

@@ -42,7 +42,7 @@ RtpProcess::Ptr RtpSelector::getProcess(const string &stream_id,bool makeNew) {
     }
     if (it != _map_rtp_process.end() && makeNew) {
         //已经被其他线程持有了，不得再被持有，否则会存在线程安全的问题
-        throw std::runtime_error(StrPrinter << "RtpProcess(" << stream_id << ") already existed");
+        throw ProcessExisted(StrPrinter << "RtpProcess(" << stream_id << ") already existed");
     }
     RtpProcessHelper::Ptr &ref = _map_rtp_process[stream_id];
     if (!ref) {

src/Rtp/RtpSelector.h

@@ -44,6 +44,13 @@ public:
     RtpSelector() = default;
     ~RtpSelector() = default;
 
+    class ProcessExisted : public std::runtime_error {
+    public:
+        template<typename ...T>
+        ProcessExisted(T && ...args) : std::runtime_error(std::forward<T>(args)...) {}
+        ~ProcessExisted() override = default;
+    };
+
     static bool getSSRC(const char *data,size_t data_len, uint32_t &ssrc);
     static RtpSelector &Instance();
 

src/Rtp/RtpSession.cpp

@@ -76,6 +76,15 @@ void RtpSession::onManager() {
 }
 
 void RtpSession::onRtpPacket(const char *data, size_t len) {
+    if (_delay_close) {
+        // 正在延时关闭中，忽略所有数据
+        return;
+    }
+    if (!isRtp(data, len)) {
+        // 忽略非rtp数据
+        WarnP(this) << "Not rtp packet";
+        return;
+    }
     if (!_is_udp) {
         if (_search_rtp) {
             //搜索上下文期间，数据丢弃
@@ -94,10 +103,6 @@ void RtpSession::onRtpPacket(const char *data, size_t len) {
         }
     }
     if (!_process) {
-        if (!isRtp(data, len)) {
-            WarnP(this) << "Not rtp packet";
-            return;
-        }
         //未设置ssrc时，尝试获取ssrc
         if (!_ssrc && !RtpSelector::getSSRC(data, len, _ssrc)) {
             return;
@@ -106,8 +111,18 @@ void RtpSession::onRtpPacket(const char *data, size_t len) {
             //未指定流id就使用ssrc为流id
             _stream_id = printSSRC(_ssrc);
         }
-        //tcp情况下，一个tcp链接只可能是一路流，不需要通过多个ssrc来区分，所以不需要频繁getProcess
-        _process = RtpSelector::Instance().getProcess(_stream_id, true);
+        try {
+            _process = RtpSelector::Instance().getProcess(_stream_id, true);
+        } catch (RtpSelector::ProcessExisted &ex) {
+            if (!_is_udp) {
+                // tcp情况下立即断开连接
+                throw;
+            }
+            // udp情况下延时断开连接(等待超时自动关闭)，防止频繁创建销毁RtpSession对象
+            WarnP(this) << ex.what();
+            _delay_close = true;
+            return;
+        }
         _process->setOnlyAudio(_only_audio);
         _process->setDelegate(dynamic_pointer_cast<RtpSession>(shared_from_this()));
     }

src/Rtp/RtpSession.h

@@ -43,6 +43,7 @@ protected:
     const char *onSearchPacketTail(const char *data, size_t len) override;
 
 private:
+    bool _delay_close = false;
     bool _is_udp = false;
     bool _search_rtp = false;
     bool _search_rtp_finished = false;