openrtpserver接口新增ssrc参数，强制过滤不属于本端口的视频流，以解决视频串流问题 (#1572)

postman/ZLMediaKit.postman_collection.json

@@ -1293,7 +1293,14 @@
 						{
 							"key": "re_use_port",
 							"value": "0",
-							"description": "是否重用端口，默认为0，非必选参数"
+							"description": "是否重用端口，默认为0，非必选参数",
+							"disabled": true
+						},
+						{
+							"key": "ssrc",
+							"value": "0",
+							"description": "是否指定收流的rtp ssrc, 十进制数字，不指定或指定0时则不过滤rtp，非必选参数",
+							"disabled": true
 						}
 					]
 				}

server/WebApi.cpp

@@ -1056,7 +1056,8 @@ void installWebApi() {
         }
 
         RtpServer::Ptr server = std::make_shared<RtpServer>();
-        server->start(allArgs["port"], stream_id, allArgs["enable_tcp"].as<bool>(), "0.0.0.0", allArgs["re_use_port"].as<bool>());
+        server->start(allArgs["port"], stream_id, allArgs["ssrc"].as<uint32_t>(), allArgs["enable_tcp"].as<bool>(),
+                      "0.0.0.0", allArgs["re_use_port"].as<bool>());
         server->setOnDetach([stream_id]() {
             //设置rtp超时移除事件
             lock_guard<recursive_mutex> lck(s_rtpServerMapMtx);

src/Rtp/RtpServer.cpp

@@ -88,7 +88,7 @@ private:
     std::shared_ptr<struct sockaddr> _rtcp_addr;
 };
 
-void RtpServer::start(uint16_t local_port, const string &stream_id,  bool enable_tcp, const char *local_ip, bool re_use_port) {
+void RtpServer::start(uint16_t local_port, const string &stream_id, uint32_t ssrc,  bool enable_tcp, const char *local_ip, bool re_use_port) {
     //创建udp服务器
     Socket::Ptr rtp_socket = Socket::createSocket(nullptr, true);
     Socket::Ptr rtcp_socket = Socket::createSocket(nullptr, true);
@@ -116,6 +116,7 @@ void RtpServer::start(uint16_t local_port, const string &stream_id,  bool enable
         tcp_server = std::make_shared<TcpServer>(rtp_socket->getPoller());
         (*tcp_server)[RtpSession::kStreamID] = stream_id;
         (*tcp_server)[RtpSession::kIsUDP] = 0;
+        (*tcp_server)[RtpSession::kSSRC] = ssrc;
         tcp_server->start<RtpSession>(rtp_socket->get_local_port(), local_ip);
     }
 
@@ -124,13 +125,18 @@ void RtpServer::start(uint16_t local_port, const string &stream_id,  bool enable
     RtpProcess::Ptr process;
     if (!stream_id.empty()) {
         //指定了流id，那么一个端口一个流(不管是否包含多个ssrc的多个流，绑定rtp源后，会筛选掉ip端口不匹配的流)
-        //由于是一个端口一个流，单线程处理即可
         process = RtpSelector::Instance().getProcess(stream_id, true);
         RtcpHelper::Ptr helper = std::make_shared<RtcpHelper>(std::move(rtcp_socket), 90000);
         helper->startRtcp();
-        rtp_socket->setOnRead([rtp_socket, process, helper](const Buffer::Ptr &buf, struct sockaddr *addr, int addr_len) {
+        rtp_socket->setOnRead([rtp_socket, process, helper, ssrc](const Buffer::Ptr &buf, struct sockaddr *addr, int addr_len) {
+            RtpHeader *header = (RtpHeader *)buf->data();
+            auto rtp_ssrc = ntohl(header->ssrc);
+            if (ssrc && rtp_ssrc != ssrc) {
+                WarnL << "ssrc不匹配,rtp已丢弃:" << rtp_ssrc << " != " << ssrc;
+            } else {
                 process->inputRtp(true, rtp_socket, buf->data(), buf->size(), addr);
                 helper->onRecvRtp(buf, addr, addr_len);
+            }
         });
     } else {
 #if 1

src/Rtp/RtpServer.h

@@ -39,7 +39,7 @@ public:
      * @param local_ip 绑定的本地网卡ip
      * @param re_use_port 是否设置socket为re_use属性
      */
-    void start(uint16_t local_port, const std::string &stream_id = "", bool enable_tcp = true, const char *local_ip = "0.0.0.0", bool re_use_port = true);
+    void start(uint16_t local_port, const std::string &stream_id = "", uint32_t ssrc = 0, bool enable_tcp = true, const char *local_ip = "0.0.0.0", bool re_use_port = true);
 
     /**
      * 获取绑定的本地端口

src/Rtp/RtpSession.cpp

@@ -21,10 +21,12 @@ namespace mediakit{
 
 const string RtpSession::kStreamID = "stream_id";
 const string RtpSession::kIsUDP = "is_udp";
+const string RtpSession::kSSRC = "ssrc";
 
 void RtpSession::attachServer(const Server &server) {
     _stream_id = const_cast<Server &>(server)[kStreamID];
     _is_udp = const_cast<Server &>(server)[kIsUDP];
+    _ssrc = const_cast<Server &>(server)[kSSRC];
 
     if (_is_udp) {
         //设置udp socket读缓存
@@ -89,7 +91,8 @@ void RtpSession::onRtpPacket(const char *data, size_t len) {
         }
     }
     if (!_process) {
-        if (!RtpSelector::getSSRC(data, len, _ssrc)) {
+        //未设置ssrc时，尝试获取ssrc
+        if (!_ssrc && !RtpSelector::getSSRC(data, len, _ssrc)) {
             return;
         }
         if (_stream_id.empty()) {
@@ -101,6 +104,12 @@ void RtpSession::onRtpPacket(const char *data, size_t len) {
         _process->setListener(dynamic_pointer_cast<RtpSession>(shared_from_this()));
     }
     try {
+        uint32_t rtp_ssrc = 0;
+        RtpSelector::getSSRC(data, len, rtp_ssrc);
+        if (rtp_ssrc != _ssrc) {
+            WarnP(this) << "ssrc不匹配,rtp已丢弃:" << rtp_ssrc << " != " << _ssrc;
+            return;
+        }
         _process->inputRtp(false, getSock(), data, len, &_addr);
     } catch (RtpTrack::BadRtpException &ex) {
         if (!_is_udp) {

src/Rtp/RtpSession.h

@@ -24,6 +24,7 @@ class RtpSession : public toolkit::Session, public RtpSplitter, public MediaSour
 public:
     static const std::string kStreamID;
     static const std::string kIsUDP;
+    static const std::string kSSRC;
 
     RtpSession(const toolkit::Socket::Ptr &sock);
     ~RtpSession() override;