From d9ee9214459f53f28ed257fb4b655c25d1e5b3de Mon Sep 17 00:00:00 2001
From: Raja Subramanian <raja.gobi@tutanota.com>
Date: Tue, 22 Apr 2025 23:12:41 +0530
Subject: [PATCH] Set up RTX for WHIP publish (#3619)

* Set up RTX for WHIP publish

* bail early on error
---
 pkg/rtc/transport.go | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/pkg/rtc/transport.go b/pkg/rtc/transport.go
index 9ec024dc3..0378e91b4 100644
--- a/pkg/rtc/transport.go
+++ b/pkg/rtc/transport.go
@@ -1267,8 +1267,17 @@ func (t *PCTransport) HandleRemoteDescription(sd webrtc.SessionDescription) erro
 		err = t.pc.SetRemoteDescription(sd)
 		if err != nil {
 			t.params.Logger.Errorw("could not set remote description on synchronous mode peer connection", err)
+			return err
 		}
-		return err
+
+		rtxRepairs := nonSimulcastRTXRepairsFromSDP(parsed, t.params.Logger)
+		if len(rtxRepairs) > 0 {
+			t.params.Logger.Debugw("rtx pairs found from sdp", "ssrcs", rtxRepairs)
+			for repair, base := range rtxRepairs {
+				t.params.Config.BufferFactory.SetRTXPair(repair, base)
+			}
+		}
+		return nil
 	}
 
 	t.postEvent(event{