From 4dcac10b3af32f832687b2c37d8f57f02624800c Mon Sep 17 00:00:00 2001
From: ziyue <1213642868@qq.com>
Date: Mon, 18 Oct 2021 17:35:14 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E5=A4=8Dwebrtc=20echo=20test=E6=97=A0?=
 =?UTF-8?q?=E6=B3=95=E5=9C=A8chrome=E4=B8=8A=E4=BD=BF=E7=94=A8=E7=9A=84?=
 =?UTF-8?q?=E9=97=AE=E9=A2=98?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 webrtc/WebRtcEchoTest.cpp | 11 +++++++++++
 webrtc/WebRtcEchoTest.h   |  1 +
 2 files changed, 12 insertions(+)

diff --git a/webrtc/WebRtcEchoTest.cpp b/webrtc/WebRtcEchoTest.cpp
index cb03c195..d2ad8e92 100644
--- a/webrtc/WebRtcEchoTest.cpp
+++ b/webrtc/WebRtcEchoTest.cpp
@@ -34,3 +34,14 @@ void WebRtcEchoTest::onRtp(const char *buf, size_t len, uint64_t stamp_ms) {
 void WebRtcEchoTest::onRtcp(const char *buf, size_t len) {
     sendRtcpPacket(buf, len, true, nullptr);
 }
+
+//修改mline的a=msid属性，目的是在echo test的情况下，如果offer和answer的msid相同，chrome会忽略远端的track
+void WebRtcEchoTest::onCheckSdp(SdpType type, RtcSession &sdp) {
+    if (type == SdpType::answer) {
+        for (auto &m : sdp.media) {
+            for (auto &ssrc : m.rtp_rtx_ssrc) {
+                ssrc.msid = "zlmediakit msid";
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/webrtc/WebRtcEchoTest.h b/webrtc/WebRtcEchoTest.h
index b212ac41..75feda5e 100644
--- a/webrtc/WebRtcEchoTest.h
+++ b/webrtc/WebRtcEchoTest.h
@@ -22,6 +22,7 @@ public:
 protected:
     ///////WebRtcTransportImp override///////
     void onRtcConfigure(RtcConfigure &configure) const override;
+    void onCheckSdp(SdpType type, RtcSession &sdp) override;
     void onRtp(const char *buf, size_t len, uint64_t stamp_ms) override;
     void onRtcp(const char *buf, size_t len) override;