From 53e757fd2c04655014f9721c88e8e052cbb00405 Mon Sep 17 00:00:00 2001
From: cnderrauber <zengjie9004@gmail.com>
Date: Tue, 17 Oct 2023 10:37:11 +0800
Subject: [PATCH] Fix panic on streamtracker_dd (#2147)

---
 pkg/sfu/streamtracker/streamtracker_dd.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkg/sfu/streamtracker/streamtracker_dd.go b/pkg/sfu/streamtracker/streamtracker_dd.go
index c19b3fe85..b0f74ef44 100644
--- a/pkg/sfu/streamtracker/streamtracker_dd.go
+++ b/pkg/sfu/streamtracker/streamtracker_dd.go
@@ -192,6 +192,10 @@ func (s *StreamTrackerDependencyDescriptor) Observe(temporalLayer int32, pktSize
 	dtis := ddVal.Descriptor.FrameDependencies.DecodeTargetIndications
 
 	for _, dt := range ddVal.DecodeTargets {
+		if len(dtis) <= dt.Target {
+			s.params.Logger.Errorw("len(dtis) less than target", nil, "target", dt.Target, "dtls", dtis)
+			continue
+		}
 		// we are not dropping discardable frames now, so only ingore not present frames
 		if dtis[dt.Target] == dd.DecodeTargetNotPresent {
 			continue