From da52167cd967d02407ff3e0d405b4259e6f5e9cc Mon Sep 17 00:00:00 2001
From: Raja Subramanian <raja.gobi@tutanota.com>
Date: Wed, 30 Aug 2023 23:08:53 +0530
Subject: [PATCH] Adjust extended sequence number to account for dropped
 packets (#2017)

---
 pkg/sfu/buffer/buffer.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pkg/sfu/buffer/buffer.go b/pkg/sfu/buffer/buffer.go
index a08d75d5a..b94cb0265 100644
--- a/pkg/sfu/buffer/buffer.go
+++ b/pkg/sfu/buffer/buffer.go
@@ -453,7 +453,8 @@ func (b *Buffer) calc(pkt []byte, arrivalTime time.Time) {
 		b.logger.Errorw("could not get sequence number adjustment", err, "sn", flowState.ExtSequenceNumber, "payloadSize", len(rtpPacket.Payload))
 		return
 	}
-	rtpPacket.Header.SequenceNumber = uint16(flowState.ExtSequenceNumber - snAdjustment)
+	flowState.ExtSequenceNumber -= snAdjustment
+	rtpPacket.Header.SequenceNumber = uint16(flowState.ExtSequenceNumber)
 	_, err = b.bucket.AddPacketWithSequenceNumber(pkt, rtpPacket.Header.SequenceNumber)
 	if err != nil {
 		if err != bucket.ErrRTXPacket {