From 586bb739120075323e7f9bbbc2ca413f5f6de432 Mon Sep 17 00:00:00 2001
From: "LeiZhi.Mai" <maiyethom@163.com>
Date: Fri, 1 Dec 2023 10:44:59 +0800
Subject: [PATCH] =?UTF-8?q?=E5=85=BC=E5=AE=B9webrtc=20offer=20sdp=E4=B8=AD?=
 =?UTF-8?q?=E9=87=8D=E5=A4=8D=E8=A1=8C=E7=9A=84=E6=83=85=E5=86=B5=20(#3038?=
 =?UTF-8?q?)?=
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---
 webrtc/Sdp.cpp | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/webrtc/Sdp.cpp b/webrtc/Sdp.cpp
index 7051e42f..89a9092c 100644
--- a/webrtc/Sdp.cpp
+++ b/webrtc/Sdp.cpp
@@ -267,16 +267,23 @@ void RtcSessionSdp::parse(const string &str) {
     static auto flag = registerAllItem();
     RtcSdpBase *media = nullptr;
     auto lines = split(str, "\n");
-    for(auto &line : lines){
+    std::set<std::string> line_set;
+    for (auto &line : lines) {
         trim(line);
-        if(line.size() < 3 || line[1] != '='){
+        if (line.size() < 3 || line[1] != '=') {
             continue;
         }
+
+        if (!line_set.emplace(line).second) {
+            continue;
+        }
+
         auto key = line.substr(0, 1);
         auto value = line.substr(2);
         if (!strcasecmp(key.data(), "m")) {
             medias.emplace_back(RtcSdpBase());
             media = &medias.back();
+            line_set.clear();
         }
 
         SdpItem::Ptr item;