Release ExtPacket if dependency descriptor or other parsing fails (#4141)

pkg/sfu/buffer/buffer.go

@@ -955,6 +955,7 @@ func (b *Buffer) getExtPacket(rtpPacket *rtp.Packet, arrivalTime int64, isBuffer
 					b.createFrameRateCalculator()
 				}
 			} else {
+				b.ReleaseExtPacket(ep)
 				return nil
 			}
 		} else if ddVal != nil {
@@ -970,6 +971,7 @@ func (b *Buffer) getExtPacket(rtpPacket *rtp.Packet, arrivalTime int64, isBuffer
 		vp8Packet := VP8{}
 		if err := vp8Packet.Unmarshal(rtpPacket.Payload); err != nil {
 			b.logger.Warnw("could not unmarshal VP8 packet", err)
+			b.ReleaseExtPacket(ep)
 			return nil
 		}
 		ep.KeyFrame = vp8Packet.IsKeyFrame
@@ -994,6 +996,7 @@ func (b *Buffer) getExtPacket(rtpPacket *rtp.Packet, arrivalTime int64, isBuffer
 			_, err := vp9Packet.Unmarshal(rtpPacket.Payload)
 			if err != nil {
 				b.logger.Warnw("could not unmarshal VP9 packet", err)
+				b.ReleaseExtPacket(ep)
 				return nil
 			}
 			ep.VideoLayer = VideoLayer{
@@ -1034,6 +1037,7 @@ func (b *Buffer) getExtPacket(rtpPacket *rtp.Packet, arrivalTime int64, isBuffer
 		if ep.DependencyDescriptor == nil {
 			if len(rtpPacket.Payload) < 2 {
 				b.logger.Warnw("invalid H265 packet", nil)
+				b.ReleaseExtPacket(ep)
 				return nil
 			}
 			ep.VideoLayer = VideoLayer{