From f0e896a5e2cbfe3e436de4854b8c0ca5f6acf02c Mon Sep 17 00:00:00 2001
From: ziyue <1213642868@qq.com>
Date: Sat, 16 Oct 2021 10:51:48 +0800
Subject: [PATCH] =?UTF-8?q?=E5=8F=8C=E5=90=91=E4=BC=9A=E8=AF=9D=E6=97=B6?=
 =?UTF-8?q?=EF=BC=8C=E7=A1=AE=E4=BF=9D=E6=94=B6=E5=8F=91ssrc=E4=B8=80?=
 =?UTF-8?q?=E8=87=B4?=
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---
 webrtc/Sdp.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/webrtc/Sdp.cpp b/webrtc/Sdp.cpp
index 115629bf..fa170e65 100644
--- a/webrtc/Sdp.cpp
+++ b/webrtc/Sdp.cpp
@@ -1713,6 +1713,10 @@ RETRY:
             if (answer_media.direction == RtpDirection::invalid) {
                 continue;
             }
+            if (answer_media.direction == RtpDirection::sendrecv) {
+                //如果是收发双向，那么我们拷贝offer sdp的ssrc，确保ssrc一致
+                answer_media.rtp_rtx_ssrc = offer_media.rtp_rtx_ssrc;
+            }
 
             //添加媒体plan
             answer_media.plan.emplace_back(*selected_plan);