From 09ce8b370705a1ce2412401e01cae977cc3f0e47 Mon Sep 17 00:00:00 2001
From: Aleksandr Alekseev <alekseev-dev@yandex-team.ru>
Date: Thu, 18 Apr 2024 20:36:32 +0300
Subject: [PATCH] Fix receiveForRtx usage for simulcast

---
 rtpreceiver.go | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/rtpreceiver.go b/rtpreceiver.go
index 2457ba080a8..ea8848d5841 100644
--- a/rtpreceiver.go
+++ b/rtpreceiver.go
@@ -433,6 +433,19 @@ func (r *RTPReceiver) receiveForRtx(ssrc SSRC, rsid string, streamInfo *intercep
 	track.repairRtcpInterceptor = rtcpInterceptor
 	track.repairStreamChannel = make(chan rtxPacketWithAttributes)
 
+	// If this function is called to read simulcast layer, do not apply rtx logic
+	if ssrc == 0 {
+		go func() {
+			b := make([]byte, r.api.settingEngine.getReceiveMTU())
+			for {
+				if _, _, readErr := track.repairInterceptor.Read(b, nil); readErr != nil {
+					return
+				}
+			}
+		}()
+		return nil
+	}
+
 	go func() {
 		for {
 			b := r.rtxPool.Get().([]byte) // nolint:forcetypeassert