From 699a995e8c470a42f0127ecb045ab3fcdc120c33 Mon Sep 17 00:00:00 2001
From: Alex X <alexey.khit@gmail.com>
Date: Tue, 8 Apr 2025 11:33:04 +0300
Subject: [PATCH] Fix deadlock on write to track channel

---
 pkg/core/track.go | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/pkg/core/track.go b/pkg/core/track.go
index 3f548b85..08765659 100644
--- a/pkg/core/track.go
+++ b/pkg/core/track.go
@@ -97,13 +97,17 @@ func NewSender(media *Media, codec *Codec) *Sender {
 		buf:   buf,
 	}
 	s.Input = func(packet *Packet) {
-		// writing to nil chan - OK, writing to closed chan - panic
 		s.mu.Lock()
-		select {
-		case s.buf <- packet:
-			s.Bytes += len(packet.Payload)
-			s.Packets++
-		default:
+		if s.buf != nil {
+			// unblocked write to channel
+			select {
+			case s.buf <- packet:
+				s.Bytes += len(packet.Payload)
+				s.Packets++
+			default:
+				s.Drops++
+			}
+		} else {
 			s.Drops++
 		}
 		s.mu.Unlock()