From e295bc4eaffa979e3fdf270e4be243c9d3720cc2 Mon Sep 17 00:00:00 2001
From: Alexey Khit <alexey.khit@gmail.com>
Date: Thu, 26 Jan 2023 22:00:25 +0300
Subject: [PATCH] Fix RTSP AAC sound from some Reolink cameras

---
 pkg/aac/rtp.go | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/pkg/aac/rtp.go b/pkg/aac/rtp.go
index f5cd9adc..74565ea7 100644
--- a/pkg/aac/rtp.go
+++ b/pkg/aac/rtp.go
@@ -17,9 +17,14 @@ func RTPDepay(track *streamer.Track) streamer.WrapperFunc {
 
 			//log.Printf("[RTP/AAC] units: %d, size: %4d, ts: %10d, %t", headersSize/2, len(packet.Payload), packet.Timestamp, packet.Marker)
 
+			data := packet.Payload[2+headersSize:]
+			if IsADTS(data) {
+				data = data[7:]
+			}
+
 			clone := *packet
 			clone.Version = RTPPacketVersionAAC
-			clone.Payload = packet.Payload[2+headersSize:]
+			clone.Payload = data
 			return push(&clone)
 		}
 	}
@@ -55,3 +60,7 @@ func RTPPay(mtu uint16) streamer.WrapperFunc {
 		}
 	}
 }
+
+func IsADTS(b []byte) bool {
+	return len(b) > 7 && b[0] == 0xFF && b[1]&0xF0 == 0xF0
+}