BytesSent duplicate counted?

[SijmenHuizenga]

I'm reading the code related to the the BytesSent variable in client

Whenever a packet needs to be sent out, it goes through here, where the BytesSent value is increased:

gortsplib/client_media.go

Lines 165 to 170 in c465264

	func (cm *clientMedia) writePacketRTPInQueueTCP(payload []byte) {
	atomic.AddUint64(cm.c.BytesSent, uint64(len(payload)))
	cm.tcpRTPFrame.Payload = payload
	cm.c.nconn.SetWriteDeadline(time.Now().Add(cm.c.WriteTimeout))
	cm.c.conn.WriteInterleavedFrame(cm.tcpRTPFrame, cm.tcpBuffer) //nolint:errcheck
	}

But the cm.c.conn is already wrapped in a bytecounter:

gortsplib/client.go

Lines 885 to 892 in c465264

	bc := bytecounter.New(c.nconn, c.BytesReceived, c.BytesSent)
	c.conn = conn.NewConn(bc)
	c.reader = &clientReader{
	c: c,
	}
	c.reader.start()
	return nil

Which also counts the bytes:

gortsplib/pkg/bytecounter/bytecounter.go

Lines 40 to 43 in c465264

	func (bc *ByteCounter) Write(p []byte) (int, error) {
	n, err := bc.rw.Write(p)
	atomic.AddUint64(bc.sent, uint64(n))
	return n, err

To me it seems like every byte is counted twice, or am I overlooking something?