add statistics to Client, ServerSession, ServerConn, ServerStream (#556) (#656)

client.go

@@ -19,6 +19,8 @@ import (
 	"github.com/pion/rtcp"
 	"github.com/pion/rtp"
 
+	"github.com/bluenviron/gortsplib/v4/internal/rtcpreceiver"
+	"github.com/bluenviron/gortsplib/v4/internal/rtcpsender"
 	"github.com/bluenviron/gortsplib/v4/pkg/auth"
 	"github.com/bluenviron/gortsplib/v4/pkg/base"
 	"github.com/bluenviron/gortsplib/v4/pkg/bytecounter"
@@ -269,8 +271,10 @@ type Client struct {
 	// explicitly request back channels to the server.
 	RequestBackChannels bool
 	// pointer to a variable that stores received bytes.
+	// Deprecated: use Client.Stats()
 	BytesReceived *uint64
 	// pointer to a variable that stores sent bytes.
+	// Deprecated: use Client.Stats()
 	BytesSent *uint64
 
 	//
@@ -326,7 +330,7 @@ type Client struct {
 	effectiveTransport   *Transport
 	backChannelSetupped  bool
 	stdChannelSetupped   bool
-	medias               map[*description.Media]*clientMedia
+	setuppedMedias       map[*description.Media]*clientMedia
 	tcpCallbackByChannel map[int]readFunc
 	lastRange            *headers.Range
 	checkTimeoutTimer    *time.Timer
@@ -341,6 +345,8 @@ type Client struct {
 	mustClose            bool
 	tcpFrame             *base.InterleavedFrame
 	tcpBuffer            []byte
+	bytesReceived        *uint64
+	bytesSent            *uint64
 
 	// in
 	chOptions  chan optionsReq
@@ -380,12 +386,6 @@ func (c *Client) Start(scheme string, host string) error {
 	if c.UserAgent == "" {
 		c.UserAgent = "gortsplib"
 	}
-	if c.BytesReceived == nil {
-		c.BytesReceived = new(uint64)
-	}
-	if c.BytesSent == nil {
-		c.BytesSent = new(uint64)
-	}
 
 	// system functions
 	if c.DialContext == nil {
@@ -454,6 +454,18 @@ func (c *Client) Start(scheme string, host string) error {
 	c.checkTimeoutTimer = emptyTimer()
 	c.keepalivePeriod = 30 * time.Second
 	c.keepaliveTimer = emptyTimer()
+
+	if c.BytesReceived != nil {
+		c.bytesReceived = c.BytesReceived
+	} else {
+		c.bytesReceived = new(uint64)
+	}
+	if c.BytesSent != nil {
+		c.bytesSent = c.BytesSent
+	} else {
+		c.bytesSent = new(uint64)
+	}
+
 	c.chOptions = make(chan optionsReq)
 	c.chDescribe = make(chan describeReq)
 	c.chAnnounce = make(chan announceReq)
@@ -739,7 +751,7 @@ func (c *Client) doClose() {
 		c.conn = nil
 	}
 
-	for _, cm := range c.medias {
+	for _, cm := range c.setuppedMedias {
 		cm.close()
 	}
 }
@@ -757,7 +769,7 @@ func (c *Client) reset() {
 	c.effectiveTransport = nil
 	c.backChannelSetupped = false
 	c.stdChannelSetupped = false
-	c.medias = nil
+	c.setuppedMedias = nil
 	c.tcpCallbackByChannel = nil
 }
 
@@ -781,7 +793,7 @@ func (c *Client) trySwitchingProtocol() error {
 
 	prevConnURL := c.connURL
 	prevBaseURL := c.baseURL
-	prevMedias := c.medias
+	prevMedias := c.setuppedMedias
 
 	c.reset()
 
@@ -801,9 +813,9 @@ func (c *Client) trySwitchingProtocol() error {
 			return err
 		}
 
-		c.medias[i].onPacketRTCP = cm.onPacketRTCP
+		c.setuppedMedias[i].onPacketRTCP = cm.onPacketRTCP
 		for j, tr := range cm.formats {
-			c.medias[i].formats[j].onPacketRTP = tr.onPacketRTP
+			c.setuppedMedias[i].formats[j].onPacketRTP = tr.onPacketRTP
 		}
 	}
 
@@ -854,7 +866,7 @@ func (c *Client) startTransportRoutines() {
 
 	c.timeDecoder = rtptime.NewGlobalDecoder2()
 
-	for _, cm := range c.medias {
+	for _, cm := range c.setuppedMedias {
 		cm.start()
 	}
 
@@ -894,7 +906,7 @@ func (c *Client) stopTransportRoutines() {
 	c.checkTimeoutTimer = emptyTimer()
 	c.keepaliveTimer = emptyTimer()
 
-	for _, cm := range c.medias {
+	for _, cm := range c.setuppedMedias {
 		cm.stop()
 	}
 
@@ -935,7 +947,7 @@ func (c *Client) connOpen() error {
 	}
 
 	c.nconn = nconn
-	bc := bytecounter.New(c.nconn, c.BytesReceived, c.BytesSent)
+	bc := bytecounter.New(c.nconn, c.bytesReceived, c.bytesSent)
 	c.conn = conn.NewConn(bc)
 	c.reader = &clientReader{
 		c: c,
@@ -1021,7 +1033,7 @@ func (c *Client) do(req *base.Request, skipResponse bool) (*base.Response, error
 }
 
 func (c *Client) atLeastOneUDPPacketHasBeenReceived() bool {
-	for _, ct := range c.medias {
+	for _, ct := range c.setuppedMedias {
 		lft := atomic.LoadInt64(ct.udpRTPListener.lastPacketTime)
 		if lft != 0 {
 			return true
@@ -1037,7 +1049,7 @@ func (c *Client) atLeastOneUDPPacketHasBeenReceived() bool {
 
 func (c *Client) isInUDPTimeout() bool {
 	now := c.timeNow()
-	for _, ct := range c.medias {
+	for _, ct := range c.setuppedMedias {
 		lft := time.Unix(atomic.LoadInt64(ct.udpRTPListener.lastPacketTime), 0)
 		if now.Sub(lft) < c.ReadTimeout {
 			return false
@@ -1347,9 +1359,10 @@ func (c *Client) doSetup(
 	}
 
 	cm := &clientMedia{
-		c:            c,
-		onPacketRTCP: func(rtcp.Packet) {},
+		c:     c,
+		media: medi,
 	}
+	cm.initialize()
 
 	if c.effectiveTransport == nil {
 		if c.connURL.Scheme == "rtsps" { // always use TCP if encrypted
@@ -1583,12 +1596,11 @@ func (c *Client) doSetup(
 		cm.tcpChannel = thRes.InterleavedIDs[0]
 	}
 
-	if c.medias == nil {
-		c.medias = make(map[*description.Media]*clientMedia)
+	if c.setuppedMedias == nil {
+		c.setuppedMedias = make(map[*description.Media]*clientMedia)
 	}
 
-	c.medias[medi] = cm
-	cm.setMedia(medi)
+	c.setuppedMedias[medi] = cm
 
 	c.baseURL = baseURL
 	c.effectiveTransport = &desiredTransport
@@ -1607,7 +1619,7 @@ func (c *Client) doSetup(
 }
 
 func (c *Client) isChannelPairInUse(channel int) bool {
-	for _, cm := range c.medias {
+	for _, cm := range c.setuppedMedias {
 		if (cm.tcpChannel+1) == channel || cm.tcpChannel == channel || cm.tcpChannel == (channel+1) {
 			return true
 		}
@@ -1712,7 +1724,7 @@ func (c *Client) doPlay(ra *headers.Range) (*base.Response, error) {
 	// don't do this with multicast, otherwise the RTP packet is going to be broadcasted
 	// to all listeners, including us, messing up the stream.
 	if *c.effectiveTransport == TransportUDP {
-		for _, cm := range c.medias {
+		for _, cm := range c.setuppedMedias {
 			byts, _ := (&rtp.Packet{Header: rtp.Header{Version: 2}}).Marshal()
 			cm.udpRTPListener.write(byts) //nolint:errcheck
 
@@ -1852,9 +1864,9 @@ func (c *Client) Seek(ra *headers.Range) (*base.Response, error) {
 	return c.Play(ra)
 }
 
-// OnPacketRTPAny sets the callback that is called when a RTP packet is read from any setupped media.
+// OnPacketRTPAny sets a callback that is called when a RTP packet is read from any setupped media.
 func (c *Client) OnPacketRTPAny(cb OnPacketRTPAnyFunc) {
-	for _, cm := range c.medias {
+	for _, cm := range c.setuppedMedias {
 		cmedia := cm.media
 		for _, forma := range cm.media.Formats {
 			c.OnPacketRTP(cm.media, forma, func(pkt *rtp.Packet) {
@@ -1864,9 +1876,9 @@ func (c *Client) OnPacketRTPAny(cb OnPacketRTPAnyFunc) {
 	}
 }
 
-// OnPacketRTCPAny sets the callback that is called when a RTCP packet is read from any setupped media.
+// OnPacketRTCPAny sets a callback that is called when a RTCP packet is read from any setupped media.
 func (c *Client) OnPacketRTCPAny(cb OnPacketRTCPAnyFunc) {
-	for _, cm := range c.medias {
+	for _, cm := range c.setuppedMedias {
 		cmedia := cm.media
 		c.OnPacketRTCP(cm.media, func(pkt rtcp.Packet) {
 			cb(cmedia, pkt)
@@ -1874,16 +1886,16 @@ func (c *Client) OnPacketRTCPAny(cb OnPacketRTCPAnyFunc) {
 	}
 }
 
-// OnPacketRTP sets the callback that is called when a RTP packet is read.
+// OnPacketRTP sets a callback that is called when a RTP packet is read.
 func (c *Client) OnPacketRTP(medi *description.Media, forma format.Format, cb OnPacketRTPFunc) {
-	cm := c.medias[medi]
+	cm := c.setuppedMedias[medi]
 	ct := cm.formats[forma.PayloadType()]
 	ct.onPacketRTP = cb
 }
 
-// OnPacketRTCP sets the callback that is called when a RTCP packet is read.
+// OnPacketRTCP sets a callback that is called when a RTCP packet is read.
 func (c *Client) OnPacketRTCP(medi *description.Media, cb OnPacketRTCPFunc) {
-	cm := c.medias[medi]
+	cm := c.setuppedMedias[medi]
 	cm.onPacketRTCP = cb
 }
 
@@ -1908,13 +1920,13 @@ func (c *Client) WritePacketRTPWithNTP(medi *description.Media, pkt *rtp.Packet,
 	default:
 	}
 
-	cm := c.medias[medi]
+	cm := c.setuppedMedias[medi]
 	cf := cm.formats[pkt.PayloadType]
 
-	cf.rtcpSender.ProcessPacket(pkt, ntp, cf.format.PTSEqualsDTS(pkt))
+	cf.rtcpSender.ProcessPacketRTP(pkt, ntp, cf.format.PTSEqualsDTS(pkt))
 
 	ok := c.writer.push(func() error {
-		return cm.writePacketRTPInQueue(byts)
+		return cf.writePacketRTPInQueue(byts)
 	})
 	if !ok {
 		return liberrors.ErrClientWriteQueueFull{}
@@ -1936,7 +1948,7 @@ func (c *Client) WritePacketRTCP(medi *description.Media, pkt rtcp.Packet) error
 	default:
 	}
 
-	cm := c.medias[medi]
+	cm := c.setuppedMedias[medi]
 
 	ok := c.writer.push(func() error {
 		return cm.writePacketRTCPInQueue(byts)
@@ -1953,7 +1965,7 @@ func (c *Client) WritePacketRTCP(medi *description.Media, pkt rtcp.Packet) error
 //
 // Deprecated: replaced by PacketPTS2.
 func (c *Client) PacketPTS(medi *description.Media, pkt *rtp.Packet) (time.Duration, bool) {
-	cm := c.medias[medi]
+	cm := c.setuppedMedias[medi]
 	ct := cm.formats[pkt.PayloadType]
 
 	v, ok := c.timeDecoder.Decode(ct.format, pkt)
@@ -1967,7 +1979,7 @@ func (c *Client) PacketPTS(medi *description.Media, pkt *rtp.Packet) (time.Durat
 // PacketPTS2 returns the PTS of an incoming RTP packet.
 // It is computed by decoding the packet timestamp and sychronizing it with other tracks.
 func (c *Client) PacketPTS2(medi *description.Media, pkt *rtp.Packet) (int64, bool) {
-	cm := c.medias[medi]
+	cm := c.setuppedMedias[medi]
 	ct := cm.formats[pkt.PayloadType]
 	return c.timeDecoder.Decode(ct.format, pkt)
 }
@@ -1975,7 +1987,194 @@ func (c *Client) PacketPTS2(medi *description.Media, pkt *rtp.Packet) (int64, bo
 // PacketNTP returns the NTP timestamp of an incoming RTP packet.
 // The NTP timestamp is computed from RTCP sender reports.
 func (c *Client) PacketNTP(medi *description.Media, pkt *rtp.Packet) (time.Time, bool) {
-	cm := c.medias[medi]
+	cm := c.setuppedMedias[medi]
 	ct := cm.formats[pkt.PayloadType]
 	return ct.rtcpReceiver.PacketNTP(pkt.Timestamp)
 }
+
+// Stats returns client statistics.
+func (c *Client) Stats() *ClientStats {
+	return &ClientStats{
+		Conn: StatsConn{
+			BytesReceived: atomic.LoadUint64(c.bytesReceived),
+			BytesSent:     atomic.LoadUint64(c.bytesSent),
+		},
+		Session: StatsSession{
+			BytesReceived: func() uint64 {
+				v := uint64(0)
+				for _, sm := range c.setuppedMedias {
+					v += atomic.LoadUint64(sm.bytesReceived)
+				}
+				return v
+			}(),
+			BytesSent: func() uint64 {
+				v := uint64(0)
+				for _, sm := range c.setuppedMedias {
+					v += atomic.LoadUint64(sm.bytesSent)
+				}
+				return v
+			}(),
+			RTPPacketsReceived: func() uint64 {
+				v := uint64(0)
+				for _, sm := range c.setuppedMedias {
+					for _, f := range sm.formats {
+						v += atomic.LoadUint64(f.rtpPacketsReceived)
+					}
+				}
+				return v
+			}(),
+			RTPPacketsSent: func() uint64 {
+				v := uint64(0)
+				for _, sm := range c.setuppedMedias {
+					for _, f := range sm.formats {
+						v += atomic.LoadUint64(f.rtpPacketsSent)
+					}
+				}
+				return v
+			}(),
+			RTPPacketsLost: func() uint64 {
+				v := uint64(0)
+				for _, sm := range c.setuppedMedias {
+					for _, f := range sm.formats {
+						v += atomic.LoadUint64(f.rtpPacketsLost)
+					}
+				}
+				return v
+			}(),
+			RTPPacketsInError: func() uint64 {
+				v := uint64(0)
+				for _, sm := range c.setuppedMedias {
+					v += atomic.LoadUint64(sm.rtpPacketsInError)
+				}
+				return v
+			}(),
+			RTPJitter: func() float64 {
+				v := float64(0)
+				n := float64(0)
+				for _, sm := range c.setuppedMedias {
+					for _, fo := range sm.formats {
+						if fo.rtcpReceiver != nil {
+							stats := fo.rtcpReceiver.Stats()
+							if stats != nil {
+								v += stats.Jitter
+								n++
+							}
+						}
+					}
+				}
+				return v / n
+			}(),
+			RTCPPacketsReceived: func() uint64 {
+				v := uint64(0)
+				for _, sm := range c.setuppedMedias {
+					v += atomic.LoadUint64(sm.rtcpPacketsReceived)
+				}
+				return v
+			}(),
+			RTCPPacketsSent: func() uint64 {
+				v := uint64(0)
+				for _, sm := range c.setuppedMedias {
+					v += atomic.LoadUint64(sm.rtcpPacketsSent)
+				}
+				return v
+			}(),
+			RTCPPacketsInError: func() uint64 {
+				v := uint64(0)
+				for _, sm := range c.setuppedMedias {
+					v += atomic.LoadUint64(sm.rtcpPacketsInError)
+				}
+				return v
+			}(),
+			Medias: func() map[*description.Media]StatsSessionMedia { //nolint:dupl
+				ret := make(map[*description.Media]StatsSessionMedia, len(c.setuppedMedias))
+
+				for med, sm := range c.setuppedMedias {
+					ret[med] = StatsSessionMedia{
+						BytesReceived:       atomic.LoadUint64(sm.bytesReceived),
+						BytesSent:           atomic.LoadUint64(sm.bytesSent),
+						RTPPacketsInError:   atomic.LoadUint64(sm.rtpPacketsInError),
+						RTCPPacketsReceived: atomic.LoadUint64(sm.rtcpPacketsReceived),
+						RTCPPacketsSent:     atomic.LoadUint64(sm.rtcpPacketsSent),
+						RTCPPacketsInError:  atomic.LoadUint64(sm.rtcpPacketsInError),
+						Formats: func() map[format.Format]StatsSessionFormat {
+							ret := make(map[format.Format]StatsSessionFormat, len(sm.formats))
+
+							for _, fo := range sm.formats {
+								recvStats := func() *rtcpreceiver.Stats {
+									if fo.rtcpReceiver != nil {
+										return fo.rtcpReceiver.Stats()
+									}
+									return nil
+								}()
+								sentStats := func() *rtcpsender.Stats {
+									if fo.rtcpSender != nil {
+										return fo.rtcpSender.Stats()
+									}
+									return nil
+								}()
+
+								ret[fo.format] = StatsSessionFormat{ //nolint:dupl
+									RTPPacketsReceived: atomic.LoadUint64(fo.rtpPacketsReceived),
+									RTPPacketsSent:     atomic.LoadUint64(fo.rtpPacketsSent),
+									RTPPacketsLost:     atomic.LoadUint64(fo.rtpPacketsLost),
+									LocalSSRC: func() uint32 {
+										if fo.rtcpReceiver != nil {
+											return *fo.rtcpReceiver.LocalSSRC
+										}
+										if sentStats != nil {
+											return sentStats.LocalSSRC
+										}
+										return 0
+									}(),
+									RemoteSSRC: func() uint32 {
+										if recvStats != nil {
+											return recvStats.RemoteSSRC
+										}
+										return 0
+									}(),
+									RTPPacketsLastSequenceNumber: func() uint16 {
+										if recvStats != nil {
+											return recvStats.LastSequenceNumber
+										}
+										if sentStats != nil {
+											return sentStats.LastSequenceNumber
+										}
+										return 0
+									}(),
+									RTPPacketsLastRTP: func() uint32 {
+										if recvStats != nil {
+											return recvStats.LastRTP
+										}
+										if sentStats != nil {
+											return sentStats.LastRTP
+										}
+										return 0
+									}(),
+									RTPPacketsLastNTP: func() time.Time {
+										if recvStats != nil {
+											return recvStats.LastNTP
+										}
+										if sentStats != nil {
+											return sentStats.LastNTP
+										}
+										return time.Time{}
+									}(),
+									RTPJitter: func() float64 {
+										if recvStats != nil {
+											return recvStats.Jitter
+										}
+										return 0
+									}(),
+								}
+							}
+
+							return ret
+						}(),
+					}
+				}
+
+				return ret
+			}(),
+		},
+	}
+}

client_format.go

@@ -1,6 +1,9 @@
 package gortsplib
 
 import (
+	"sync/atomic"
+	"time"
+
 	"github.com/pion/rtcp"
 	"github.com/pion/rtp"
 
@@ -17,13 +20,29 @@ type clientFormat struct {
 	format      format.Format
 	onPacketRTP OnPacketRTPFunc
 
-	udpReorderer    *rtpreorderer.Reorderer       // play
-	tcpLossDetector *rtplossdetector.LossDetector // play
-	rtcpReceiver    *rtcpreceiver.RTCPReceiver    // play
-	rtcpSender      *rtcpsender.RTCPSender        // record or back channel
+	udpReorderer          *rtpreorderer.Reorderer       // play
+	tcpLossDetector       *rtplossdetector.LossDetector // play
+	rtcpReceiver          *rtcpreceiver.RTCPReceiver    // play
+	rtcpSender            *rtcpsender.RTCPSender        // record or back channel
+	writePacketRTPInQueue func([]byte) error
+	rtpPacketsReceived    *uint64
+	rtpPacketsSent        *uint64
+	rtpPacketsLost        *uint64
+}
+
+func (cf *clientFormat) initialize() {
+	cf.rtpPacketsReceived = new(uint64)
+	cf.rtpPacketsSent = new(uint64)
+	cf.rtpPacketsLost = new(uint64)
 }
 
 func (cf *clientFormat) start() {
+	if cf.cm.udpRTPListener != nil {
+		cf.writePacketRTPInQueue = cf.writePacketRTPInQueueUDP
+	} else {
+		cf.writePacketRTPInQueue = cf.writePacketRTPInQueueTCP
+	}
+
 	if cf.cm.c.state == clientStateRecord || cf.cm.media.IsBackChannel {
 		cf.rtcpSender = &rtcpsender.RTCPSender{
 			ClockRate: cf.format.ClockRate(),
@@ -72,40 +91,70 @@ func (cf *clientFormat) stop() {
 	}
 }
 
-func (cf *clientFormat) readRTPUDP(pkt *rtp.Packet) {
+func (cf *clientFormat) readPacketRTPUDP(pkt *rtp.Packet) {
 	packets, lost := cf.udpReorderer.Process(pkt)
 	if lost != 0 {
-		cf.cm.c.OnPacketLost(liberrors.ErrClientRTPPacketsLost{Lost: lost})
+		cf.onPacketRTPLost(lost)
 		// do not return
 	}
 
 	now := cf.cm.c.timeNow()
 
 	for _, pkt := range packets {
-		err := cf.rtcpReceiver.ProcessPacket(pkt, now, cf.format.PTSEqualsDTS(pkt))
-		if err != nil {
-			cf.cm.c.OnDecodeError(err)
-			continue
-		}
-
-		cf.onPacketRTP(pkt)
+		cf.handlePacketRTP(pkt, now)
 	}
 }
 
-func (cf *clientFormat) readRTPTCP(pkt *rtp.Packet) {
+func (cf *clientFormat) readPacketRTPTCP(pkt *rtp.Packet) {
 	lost := cf.tcpLossDetector.Process(pkt)
 	if lost != 0 {
-		cf.cm.c.OnPacketLost(liberrors.ErrClientRTPPacketsLost{Lost: lost})
+		cf.onPacketRTPLost(lost)
 		// do not return
 	}
 
 	now := cf.cm.c.timeNow()
 
-	err := cf.rtcpReceiver.ProcessPacket(pkt, now, cf.format.PTSEqualsDTS(pkt))
+	cf.handlePacketRTP(pkt, now)
+}
+
+func (cf *clientFormat) handlePacketRTP(pkt *rtp.Packet, now time.Time) {
+	err := cf.rtcpReceiver.ProcessPacketRTP(pkt, now, cf.format.PTSEqualsDTS(pkt))
 	if err != nil {
-		cf.cm.c.OnDecodeError(err)
+		cf.cm.onPacketRTPDecodeError(err)
 		return
 	}
 
+	atomic.AddUint64(cf.rtpPacketsReceived, 1)
+
 	cf.onPacketRTP(pkt)
 }
+
+func (cf *clientFormat) onPacketRTPLost(lost uint) {
+	atomic.AddUint64(cf.rtpPacketsLost, uint64(lost))
+	cf.cm.c.OnPacketLost(liberrors.ErrClientRTPPacketsLost{Lost: lost})
+}
+
+func (cf *clientFormat) writePacketRTPInQueueUDP(payload []byte) error {
+	err := cf.cm.udpRTPListener.write(payload)
+	if err != nil {
+		return err
+	}
+
+	atomic.AddUint64(cf.cm.bytesSent, uint64(len(payload)))
+	atomic.AddUint64(cf.rtpPacketsSent, 1)
+	return nil
+}
+
+func (cf *clientFormat) writePacketRTPInQueueTCP(payload []byte) error {
+	cf.cm.c.tcpFrame.Channel = cf.cm.tcpChannel
+	cf.cm.c.tcpFrame.Payload = payload
+	cf.cm.c.nconn.SetWriteDeadline(time.Now().Add(cf.cm.c.WriteTimeout))
+	err := cf.cm.c.conn.WriteInterleavedFrame(cf.cm.c.tcpFrame, cf.cm.c.tcpBuffer)
+	if err != nil {
+		return err
+	}
+
+	atomic.AddUint64(cf.cm.bytesSent, uint64(len(payload)))
+	atomic.AddUint64(cf.rtpPacketsSent, 1)
+	return nil
+}

client_media.go

@@ -13,16 +13,43 @@ import (
 )
 
 type clientMedia struct {
-	c            *Client
-	onPacketRTCP OnPacketRTCPFunc
+	c     *Client
+	media *description.Media
 
-	media                  *description.Media
+	onPacketRTCP           OnPacketRTCPFunc
 	formats                map[uint8]*clientFormat
 	tcpChannel             int
 	udpRTPListener         *clientUDPListener
 	udpRTCPListener        *clientUDPListener
-	writePacketRTPInQueue  func([]byte) error
 	writePacketRTCPInQueue func([]byte) error
+	bytesReceived          *uint64
+	bytesSent              *uint64
+	rtpPacketsInError      *uint64
+	rtcpPacketsReceived    *uint64
+	rtcpPacketsSent        *uint64
+	rtcpPacketsInError     *uint64
+}
+
+func (cm *clientMedia) initialize() {
+	cm.onPacketRTCP = func(rtcp.Packet) {}
+	cm.bytesReceived = new(uint64)
+	cm.bytesSent = new(uint64)
+	cm.rtpPacketsInError = new(uint64)
+	cm.rtcpPacketsReceived = new(uint64)
+	cm.rtcpPacketsSent = new(uint64)
+	cm.rtcpPacketsInError = new(uint64)
+
+	cm.formats = make(map[uint8]*clientFormat)
+
+	for _, forma := range cm.media.Formats {
+		f := &clientFormat{
+			cm:          cm,
+			format:      forma,
+			onPacketRTP: func(*rtp.Packet) {},
+		}
+		f.initialize()
+		cm.formats[forma.PayloadType()] = f
+	}
 }
 
 func (cm *clientMedia) close() {
@@ -71,33 +98,18 @@ func (cm *clientMedia) allocateUDPListeners(
 	return err
 }
 
-func (cm *clientMedia) setMedia(medi *description.Media) {
-	cm.media = medi
-
-	cm.formats = make(map[uint8]*clientFormat)
-	for _, forma := range medi.Formats {
-		cm.formats[forma.PayloadType()] = &clientFormat{
-			cm:          cm,
-			format:      forma,
-			onPacketRTP: func(*rtp.Packet) {},
-		}
-	}
-}
-
 func (cm *clientMedia) start() {
 	if cm.udpRTPListener != nil {
-		cm.writePacketRTPInQueue = cm.writePacketRTPInQueueUDP
 		cm.writePacketRTCPInQueue = cm.writePacketRTCPInQueueUDP
 
 		if cm.c.state == clientStateRecord || cm.media.IsBackChannel {
-			cm.udpRTPListener.readFunc = cm.readRTPUDPRecord
-			cm.udpRTCPListener.readFunc = cm.readRTCPUDPRecord
+			cm.udpRTPListener.readFunc = cm.readPacketRTPUDPRecord
+			cm.udpRTCPListener.readFunc = cm.readPacketRTCPUDPRecord
 		} else {
-			cm.udpRTPListener.readFunc = cm.readRTPUDPPlay
-			cm.udpRTCPListener.readFunc = cm.readRTCPUDPPlay
+			cm.udpRTPListener.readFunc = cm.readPacketRTPUDPPlay
+			cm.udpRTCPListener.readFunc = cm.readPacketRTCPUDPPlay
 		}
 	} else {
-		cm.writePacketRTPInQueue = cm.writePacketRTPInQueueTCP
 		cm.writePacketRTCPInQueue = cm.writePacketRTCPInQueueTCP
 
 		if cm.c.tcpCallbackByChannel == nil {
@@ -105,11 +117,11 @@ func (cm *clientMedia) start() {
 		}
 
 		if cm.c.state == clientStateRecord || cm.media.IsBackChannel {
-			cm.c.tcpCallbackByChannel[cm.tcpChannel] = cm.readRTPTCPRecord
-			cm.c.tcpCallbackByChannel[cm.tcpChannel+1] = cm.readRTCPTCPRecord
+			cm.c.tcpCallbackByChannel[cm.tcpChannel] = cm.readPacketRTPTCPRecord
+			cm.c.tcpCallbackByChannel[cm.tcpChannel+1] = cm.readPacketRTCPTCPRecord
 		} else {
-			cm.c.tcpCallbackByChannel[cm.tcpChannel] = cm.readRTPTCPPlay
-			cm.c.tcpCallbackByChannel[cm.tcpChannel+1] = cm.readRTCPTCPPlay
+			cm.c.tcpCallbackByChannel[cm.tcpChannel] = cm.readPacketRTPTCPPlay
+			cm.c.tcpCallbackByChannel[cm.tcpChannel+1] = cm.readPacketRTCPTCPPlay
 		}
 	}
 
@@ -136,73 +148,82 @@ func (cm *clientMedia) stop() {
 
 func (cm *clientMedia) findFormatWithSSRC(ssrc uint32) *clientFormat {
 	for _, format := range cm.formats {
-		tssrc, ok := format.rtcpReceiver.SenderSSRC()
-		if ok && tssrc == ssrc {
+		stats := format.rtcpReceiver.Stats()
+		if stats != nil && stats.RemoteSSRC == ssrc {
 			return format
 		}
 	}
 	return nil
 }
 
-func (cm *clientMedia) writePacketRTPInQueueUDP(payload []byte) error {
-	return cm.udpRTPListener.write(payload)
-}
-
 func (cm *clientMedia) writePacketRTCPInQueueUDP(payload []byte) error {
-	return cm.udpRTCPListener.write(payload)
-}
+	err := cm.udpRTCPListener.write(payload)
+	if err != nil {
+		return err
+	}
 
-func (cm *clientMedia) writePacketRTPInQueueTCP(payload []byte) error {
-	cm.c.tcpFrame.Channel = cm.tcpChannel
-	cm.c.tcpFrame.Payload = payload
-	cm.c.nconn.SetWriteDeadline(time.Now().Add(cm.c.WriteTimeout))
-	return cm.c.conn.WriteInterleavedFrame(cm.c.tcpFrame, cm.c.tcpBuffer)
+	atomic.AddUint64(cm.bytesSent, uint64(len(payload)))
+	atomic.AddUint64(cm.rtcpPacketsSent, 1)
+	return nil
 }
 
 func (cm *clientMedia) writePacketRTCPInQueueTCP(payload []byte) error {
 	cm.c.tcpFrame.Channel = cm.tcpChannel + 1
 	cm.c.tcpFrame.Payload = payload
 	cm.c.nconn.SetWriteDeadline(time.Now().Add(cm.c.WriteTimeout))
-	return cm.c.conn.WriteInterleavedFrame(cm.c.tcpFrame, cm.c.tcpBuffer)
+	err := cm.c.conn.WriteInterleavedFrame(cm.c.tcpFrame, cm.c.tcpBuffer)
+	if err != nil {
+		return err
+	}
+
+	atomic.AddUint64(cm.bytesSent, uint64(len(payload)))
+	atomic.AddUint64(cm.rtcpPacketsSent, 1)
+	return nil
 }
 
-func (cm *clientMedia) readRTPTCPPlay(payload []byte) bool {
+func (cm *clientMedia) readPacketRTPTCPPlay(payload []byte) bool {
+	atomic.AddUint64(cm.bytesReceived, uint64(len(payload)))
+
 	now := cm.c.timeNow()
 	atomic.StoreInt64(cm.c.tcpLastFrameTime, now.Unix())
 
 	pkt := &rtp.Packet{}
 	err := pkt.Unmarshal(payload)
 	if err != nil {
-		cm.c.OnDecodeError(err)
+		cm.onPacketRTPDecodeError(err)
 		return false
 	}
 
 	forma, ok := cm.formats[pkt.PayloadType]
 	if !ok {
-		cm.c.OnDecodeError(liberrors.ErrClientRTPPacketUnknownPayloadType{PayloadType: pkt.PayloadType})
+		cm.onPacketRTPDecodeError(liberrors.ErrClientRTPPacketUnknownPayloadType{PayloadType: pkt.PayloadType})
 		return false
 	}
 
-	forma.readRTPTCP(pkt)
+	forma.readPacketRTPTCP(pkt)
 
 	return true
 }
 
-func (cm *clientMedia) readRTCPTCPPlay(payload []byte) bool {
+func (cm *clientMedia) readPacketRTCPTCPPlay(payload []byte) bool {
+	atomic.AddUint64(cm.bytesReceived, uint64(len(payload)))
+
 	now := cm.c.timeNow()
 	atomic.StoreInt64(cm.c.tcpLastFrameTime, now.Unix())
 
 	if len(payload) > udpMaxPayloadSize {
-		cm.c.OnDecodeError(liberrors.ErrClientRTCPPacketTooBig{L: len(payload), Max: udpMaxPayloadSize})
+		cm.onPacketRTCPDecodeError(liberrors.ErrClientRTCPPacketTooBig{L: len(payload), Max: udpMaxPayloadSize})
 		return false
 	}
 
 	packets, err := rtcp.Unmarshal(payload)
 	if err != nil {
-		cm.c.OnDecodeError(err)
+		cm.onPacketRTCPDecodeError(err)
 		return false
 	}
 
+	atomic.AddUint64(cm.rtcpPacketsReceived, uint64(len(packets)))
+
 	for _, pkt := range packets {
 		if sr, ok := pkt.(*rtcp.SenderReport); ok {
 			format := cm.findFormatWithSSRC(sr.SSRC)
@@ -217,22 +238,26 @@ func (cm *clientMedia) readRTCPTCPPlay(payload []byte) bool {
 	return true
 }
 
-func (cm *clientMedia) readRTPTCPRecord(_ []byte) bool {
+func (cm *clientMedia) readPacketRTPTCPRecord(_ []byte) bool {
 	return false
 }
 
-func (cm *clientMedia) readRTCPTCPRecord(payload []byte) bool {
+func (cm *clientMedia) readPacketRTCPTCPRecord(payload []byte) bool {
+	atomic.AddUint64(cm.bytesReceived, uint64(len(payload)))
+
 	if len(payload) > udpMaxPayloadSize {
-		cm.c.OnDecodeError(liberrors.ErrClientRTCPPacketTooBig{L: len(payload), Max: udpMaxPayloadSize})
+		cm.onPacketRTCPDecodeError(liberrors.ErrClientRTCPPacketTooBig{L: len(payload), Max: udpMaxPayloadSize})
 		return false
 	}
 
 	packets, err := rtcp.Unmarshal(payload)
 	if err != nil {
-		cm.c.OnDecodeError(err)
+		cm.onPacketRTCPDecodeError(err)
 		return false
 	}
 
+	atomic.AddUint64(cm.rtcpPacketsReceived, uint64(len(packets)))
+
 	for _, pkt := range packets {
 		cm.onPacketRTCP(pkt)
 	}
@@ -240,47 +265,50 @@ func (cm *clientMedia) readRTCPTCPRecord(payload []byte) bool {
 	return true
 }
 
-func (cm *clientMedia) readRTPUDPPlay(payload []byte) bool {
-	plen := len(payload)
+func (cm *clientMedia) readPacketRTPUDPPlay(payload []byte) bool {
+	atomic.AddUint64(cm.bytesReceived, uint64(len(payload)))
 
-	if plen == (udpMaxPayloadSize + 1) {
-		cm.c.OnDecodeError(liberrors.ErrClientRTPPacketTooBigUDP{})
+	if len(payload) == (udpMaxPayloadSize + 1) {
+		cm.onPacketRTPDecodeError(liberrors.ErrClientRTPPacketTooBigUDP{})
 		return false
 	}
 
 	pkt := &rtp.Packet{}
 	err := pkt.Unmarshal(payload)
 	if err != nil {
-		cm.c.OnDecodeError(err)
+		cm.onPacketRTPDecodeError(err)
 		return false
 	}
 
 	forma, ok := cm.formats[pkt.PayloadType]
 	if !ok {
-		cm.c.OnDecodeError(liberrors.ErrClientRTPPacketUnknownPayloadType{PayloadType: pkt.PayloadType})
+		cm.onPacketRTPDecodeError(liberrors.ErrClientRTPPacketUnknownPayloadType{PayloadType: pkt.PayloadType})
 		return false
 	}
 
-	forma.readRTPUDP(pkt)
+	forma.readPacketRTPUDP(pkt)
 
 	return true
 }
 
-func (cm *clientMedia) readRTCPUDPPlay(payload []byte) bool {
-	now := cm.c.timeNow()
-	plen := len(payload)
+func (cm *clientMedia) readPacketRTCPUDPPlay(payload []byte) bool {
+	atomic.AddUint64(cm.bytesReceived, uint64(len(payload)))
 
-	if plen == (udpMaxPayloadSize + 1) {
-		cm.c.OnDecodeError(liberrors.ErrClientRTCPPacketTooBigUDP{})
+	if len(payload) == (udpMaxPayloadSize + 1) {
+		cm.onPacketRTCPDecodeError(liberrors.ErrClientRTCPPacketTooBigUDP{})
 		return false
 	}
 
 	packets, err := rtcp.Unmarshal(payload)
 	if err != nil {
-		cm.c.OnDecodeError(err)
+		cm.onPacketRTCPDecodeError(err)
 		return false
 	}
 
+	now := cm.c.timeNow()
+
+	atomic.AddUint64(cm.rtcpPacketsReceived, uint64(len(packets)))
+
 	for _, pkt := range packets {
 		if sr, ok := pkt.(*rtcp.SenderReport); ok {
 			format := cm.findFormatWithSSRC(sr.SSRC)
@@ -295,27 +323,39 @@ func (cm *clientMedia) readRTCPUDPPlay(payload []byte) bool {
 	return true
 }
 
-func (cm *clientMedia) readRTPUDPRecord(_ []byte) bool {
+func (cm *clientMedia) readPacketRTPUDPRecord(_ []byte) bool {
 	return false
 }
 
-func (cm *clientMedia) readRTCPUDPRecord(payload []byte) bool {
-	plen := len(payload)
+func (cm *clientMedia) readPacketRTCPUDPRecord(payload []byte) bool {
+	atomic.AddUint64(cm.bytesReceived, uint64(len(payload)))
 
-	if plen == (udpMaxPayloadSize + 1) {
-		cm.c.OnDecodeError(liberrors.ErrClientRTCPPacketTooBigUDP{})
+	if len(payload) == (udpMaxPayloadSize + 1) {
+		cm.onPacketRTCPDecodeError(liberrors.ErrClientRTCPPacketTooBigUDP{})
 		return false
 	}
 
 	packets, err := rtcp.Unmarshal(payload)
 	if err != nil {
-		cm.c.OnDecodeError(err)
+		cm.onPacketRTCPDecodeError(err)
 		return false
 	}
 
+	atomic.AddUint64(cm.rtcpPacketsReceived, uint64(len(packets)))
+
 	for _, pkt := range packets {
 		cm.onPacketRTCP(pkt)
 	}
 
 	return true
 }
+
+func (cm *clientMedia) onPacketRTPDecodeError(err error) {
+	atomic.AddUint64(cm.rtpPacketsInError, 1)
+	cm.c.OnDecodeError(err)
+}
+
+func (cm *clientMedia) onPacketRTCPDecodeError(err error) {
+	atomic.AddUint64(cm.rtcpPacketsInError, 1)
+	cm.c.OnDecodeError(err)
+}

client_play_test.go

@@ -545,10 +545,11 @@ func TestClientPlay(t *testing.T) {
 
 			<-packetRecv
 
-			require.Greater(t, atomic.LoadUint64(c.BytesSent), uint64(620))
-			require.Less(t, atomic.LoadUint64(c.BytesSent), uint64(850))
-			require.Greater(t, atomic.LoadUint64(c.BytesReceived), uint64(580))
-			require.Less(t, atomic.LoadUint64(c.BytesReceived), uint64(650))
+			s := c.Stats()
+			require.Greater(t, s.Session.BytesSent, uint64(19))
+			require.Less(t, s.Session.BytesSent, uint64(41))
+			require.Greater(t, s.Session.BytesReceived, uint64(31))
+			require.Less(t, s.Session.BytesReceived, uint64(37))
 		})
 	}
 }

client_record_test.go

@@ -7,7 +7,6 @@ import (
 	"net"
 	"strings"
 	"sync"
-	"sync/atomic"
 	"testing"
 	"time"
 
@@ -336,10 +335,11 @@ func TestClientRecord(t *testing.T) {
 
 			<-recvDone
 
-			require.Greater(t, atomic.LoadUint64(c.BytesSent), uint64(730))
-			require.Less(t, atomic.LoadUint64(c.BytesSent), uint64(760))
-			require.Greater(t, atomic.LoadUint64(c.BytesReceived), uint64(180))
-			require.Less(t, atomic.LoadUint64(c.BytesReceived), uint64(210))
+			s := c.Stats()
+			require.Greater(t, s.Session.BytesSent, uint64(15))
+			require.Less(t, s.Session.BytesSent, uint64(17))
+			require.Greater(t, s.Session.BytesReceived, uint64(19))
+			require.Less(t, s.Session.BytesReceived, uint64(21))
 
 			c.Close()
 			<-done

client_stats.go

@@ -0,0 +1,7 @@
+package gortsplib
+
+// ClientStats are client statistics
+type ClientStats struct {
+	Conn    StatsConn
+	Session StatsSession
+}

client_udp_listener.go

@@ -173,8 +173,6 @@ func (u *clientUDPListener) run() {
 		now := u.c.timeNow()
 		atomic.StoreInt64(u.lastPacketTime, now.Unix())
 
-		atomic.AddUint64(u.c.BytesReceived, uint64(n))
-
 		if u.readFunc(buf[:n]) {
 			createNewBuffer()
 		}
@@ -182,8 +180,6 @@ func (u *clientUDPListener) run() {
 }
 
 func (u *clientUDPListener) write(payload []byte) error {
-	atomic.AddUint64(u.c.BytesSent, uint64(len(payload)))
-
 	// no mutex is needed here since Write() has an internal lock.
 	// https://github.com/golang/go/issues/27203#issuecomment-534386117
 	u.pc.SetWriteDeadline(time.Now().Add(u.c.WriteTimeout))

internal/rtcpreceiver/rtcpreceiver.go

@@ -30,7 +30,7 @@ func randUint32() (uint32, error) {
 // RTCPReceiver is a utility to generate RTCP receiver reports.
 type RTCPReceiver struct {
 	ClockRate       int
-	ReceiverSSRC    *uint32
+	LocalSSRC       *uint32
 	Period          time.Duration
 	TimeNow         func() time.Time
 	WritePacketRTCP func(rtcp.Packet)
@@ -42,7 +42,7 @@ type RTCPReceiver struct {
 	timeInitialized        bool
 	sequenceNumberCycles   uint16
 	lastSequenceNumber     uint16
-	senderSSRC             uint32
+	remoteSSRC             uint32
 	lastTimeRTP            uint32
 	lastTimeSystem         time.Time
 	totalLost              uint32
@@ -62,12 +62,12 @@ type RTCPReceiver struct {
 
 // Initialize initializes RTCPReceiver.
 func (rr *RTCPReceiver) Initialize() error {
-	if rr.ReceiverSSRC == nil {
+	if rr.LocalSSRC == nil {
 		v, err := randUint32()
 		if err != nil {
 			return err
 		}
-		rr.ReceiverSSRC = &v
+		rr.LocalSSRC = &v
 	}
 
 	if rr.TimeNow == nil {
@@ -119,10 +119,10 @@ func (rr *RTCPReceiver) report() rtcp.Packet {
 	system := rr.TimeNow()
 
 	report := &rtcp.ReceiverReport{
-		SSRC: *rr.ReceiverSSRC,
+		SSRC: *rr.LocalSSRC,
 		Reports: []rtcp.ReceptionReport{
 			{
-				SSRC:               rr.senderSSRC,
+				SSRC:               rr.remoteSSRC,
 				LastSequenceNumber: uint32(rr.sequenceNumberCycles)<<16 | uint32(rr.lastSequenceNumber),
 				// equivalent to taking the integer part after multiplying the
 				// loss fraction by 256
@@ -149,8 +149,8 @@ func (rr *RTCPReceiver) report() rtcp.Packet {
 	return report
 }
 
-// ProcessPacket extracts the needed data from RTP packets.
-func (rr *RTCPReceiver) ProcessPacket(pkt *rtp.Packet, system time.Time, ptsEqualsDTS bool) error {
+// ProcessPacketRTP extracts the needed data from RTP packets.
+func (rr *RTCPReceiver) ProcessPacketRTP(pkt *rtp.Packet, system time.Time, ptsEqualsDTS bool) error {
 	rr.mutex.Lock()
 	defer rr.mutex.Unlock()
 
@@ -159,7 +159,7 @@ func (rr *RTCPReceiver) ProcessPacket(pkt *rtp.Packet, system time.Time, ptsEqua
 		rr.firstRTPPacketReceived = true
 		rr.totalSinceReport = 1
 		rr.lastSequenceNumber = pkt.SequenceNumber
-		rr.senderSSRC = pkt.SSRC
+		rr.remoteSSRC = pkt.SSRC
 
 		if ptsEqualsDTS {
 			rr.timeInitialized = true
@@ -169,8 +169,8 @@ func (rr *RTCPReceiver) ProcessPacket(pkt *rtp.Packet, system time.Time, ptsEqua
 
 		// subsequent packets
 	} else {
-		if pkt.SSRC != rr.senderSSRC {
-			return fmt.Errorf("received packet with wrong SSRC %d, expected %d", pkt.SSRC, rr.senderSSRC)
+		if pkt.SSRC != rr.remoteSSRC {
+			return fmt.Errorf("received packet with wrong SSRC %d, expected %d", pkt.SSRC, rr.remoteSSRC)
 		}
 
 		diff := int32(pkt.SequenceNumber) - int32(rr.lastSequenceNumber)
@@ -229,11 +229,7 @@ func (rr *RTCPReceiver) ProcessSenderReport(sr *rtcp.SenderReport, system time.T
 	rr.lastSenderReportTimeSystem = system
 }
 
-// PacketNTP returns the NTP timestamp of the packet.
-func (rr *RTCPReceiver) PacketNTP(ts uint32) (time.Time, bool) {
-	rr.mutex.Lock()
-	defer rr.mutex.Unlock()
-
+func (rr *RTCPReceiver) packetNTPUnsafe(ts uint32) (time.Time, bool) {
 	if !rr.firstSenderReportReceived {
 		return time.Time{}, false
 	}
@@ -244,9 +240,39 @@ func (rr *RTCPReceiver) PacketNTP(ts uint32) (time.Time, bool) {
 	return ntpTimeRTCPToGo(rr.lastSenderReportTimeNTP).Add(timeDiffGo), true
 }
 
-// SenderSSRC returns the SSRC of outgoing RTP packets.
-func (rr *RTCPReceiver) SenderSSRC() (uint32, bool) {
+// PacketNTP returns the NTP timestamp of the packet.
+func (rr *RTCPReceiver) PacketNTP(ts uint32) (time.Time, bool) {
+	rr.mutex.Lock()
+	defer rr.mutex.Unlock()
+
+	return rr.packetNTPUnsafe(ts)
+}
+
+// Stats are statistics.
+type Stats struct {
+	RemoteSSRC         uint32
+	LastSequenceNumber uint16
+	LastRTP            uint32
+	LastNTP            time.Time
+	Jitter             float64
+}
+
+// Stats returns statistics.
+func (rr *RTCPReceiver) Stats() *Stats {
 	rr.mutex.RLock()
 	defer rr.mutex.RUnlock()
-	return rr.senderSSRC, rr.firstRTPPacketReceived
+
+	if !rr.firstRTPPacketReceived {
+		return nil
+	}
+
+	ntp, _ := rr.packetNTPUnsafe(rr.lastTimeRTP)
+
+	return &Stats{
+		RemoteSSRC:         rr.remoteSSRC,
+		LastSequenceNumber: rr.lastSequenceNumber,
+		LastRTP:            rr.lastTimeRTP,
+		LastNTP:            ntp,
+		Jitter:             rr.jitter,
+	}
 }

internal/rtcpreceiver/rtcpreceiver_test.go

@@ -17,9 +17,9 @@ func TestRTCPReceiverBase(t *testing.T) {
 	done := make(chan struct{})
 
 	rr := &RTCPReceiver{
-		ClockRate:    90000,
-		ReceiverSSRC: uint32Ptr(0x65f83afb),
-		Period:       500 * time.Millisecond,
+		ClockRate: 90000,
+		LocalSSRC: uint32Ptr(0x65f83afb),
+		Period:    500 * time.Millisecond,
 		TimeNow: func() time.Time {
 			return time.Date(2008, 0o5, 20, 22, 15, 22, 0, time.UTC)
 		},
@@ -64,7 +64,7 @@ func TestRTCPReceiverBase(t *testing.T) {
 		Payload: []byte("\x00\x00"),
 	}
 	ts = time.Date(2008, 0o5, 20, 22, 15, 20, 0, time.UTC)
-	err = rr.ProcessPacket(&rtpPkt, ts, true)
+	err = rr.ProcessPacketRTP(&rtpPkt, ts, true)
 	require.NoError(t, err)
 
 	rtpPkt = rtp.Packet{
@@ -79,7 +79,7 @@ func TestRTCPReceiverBase(t *testing.T) {
 		Payload: []byte("\x00\x00"),
 	}
 	ts = time.Date(2008, 0o5, 20, 22, 15, 21, 0, time.UTC)
-	err = rr.ProcessPacket(&rtpPkt, ts, true)
+	err = rr.ProcessPacketRTP(&rtpPkt, ts, true)
 	require.NoError(t, err)
 
 	<-done
@@ -89,9 +89,9 @@ func TestRTCPReceiverOverflow(t *testing.T) {
 	done := make(chan struct{})
 
 	rr := &RTCPReceiver{
-		ClockRate:    90000,
-		ReceiverSSRC: uint32Ptr(0x65f83afb),
-		Period:       250 * time.Millisecond,
+		ClockRate: 90000,
+		LocalSSRC: uint32Ptr(0x65f83afb),
+		Period:    250 * time.Millisecond,
 		TimeNow: func() time.Time {
 			return time.Date(2008, 0o5, 20, 22, 15, 21, 0, time.UTC)
 		},
@@ -138,7 +138,7 @@ func TestRTCPReceiverOverflow(t *testing.T) {
 		Payload: []byte("\x00\x00"),
 	}
 	ts = time.Date(2008, 0o5, 20, 22, 15, 20, 0, time.UTC)
-	err = rr.ProcessPacket(&rtpPkt, ts, true)
+	err = rr.ProcessPacketRTP(&rtpPkt, ts, true)
 	require.NoError(t, err)
 
 	rtpPkt = rtp.Packet{
@@ -153,7 +153,7 @@ func TestRTCPReceiverOverflow(t *testing.T) {
 		Payload: []byte("\x00\x00"),
 	}
 	ts = time.Date(2008, 0o5, 20, 22, 15, 20, 0, time.UTC)
-	err = rr.ProcessPacket(&rtpPkt, ts, true)
+	err = rr.ProcessPacketRTP(&rtpPkt, ts, true)
 	require.NoError(t, err)
 
 	<-done
@@ -163,9 +163,9 @@ func TestRTCPReceiverPacketLost(t *testing.T) {
 	done := make(chan struct{})
 
 	rr := &RTCPReceiver{
-		ClockRate:    90000,
-		ReceiverSSRC: uint32Ptr(0x65f83afb),
-		Period:       500 * time.Millisecond,
+		ClockRate: 90000,
+		LocalSSRC: uint32Ptr(0x65f83afb),
+		Period:    500 * time.Millisecond,
 		TimeNow: func() time.Time {
 			return time.Date(2008, 0o5, 20, 22, 15, 21, 0, time.UTC)
 		},
@@ -215,7 +215,7 @@ func TestRTCPReceiverPacketLost(t *testing.T) {
 		Payload: []byte("\x00\x00"),
 	}
 	ts = time.Date(2008, 0o5, 20, 22, 15, 20, 0, time.UTC)
-	err = rr.ProcessPacket(&rtpPkt, ts, true)
+	err = rr.ProcessPacketRTP(&rtpPkt, ts, true)
 	require.NoError(t, err)
 
 	rtpPkt = rtp.Packet{
@@ -230,7 +230,7 @@ func TestRTCPReceiverPacketLost(t *testing.T) {
 		Payload: []byte("\x00\x00"),
 	}
 	ts = time.Date(2008, 0o5, 20, 22, 15, 20, 0, time.UTC)
-	err = rr.ProcessPacket(&rtpPkt, ts, true)
+	err = rr.ProcessPacketRTP(&rtpPkt, ts, true)
 	require.NoError(t, err)
 
 	<-done
@@ -240,9 +240,9 @@ func TestRTCPReceiverOverflowPacketLost(t *testing.T) {
 	done := make(chan struct{})
 
 	rr := &RTCPReceiver{
-		ClockRate:    90000,
-		ReceiverSSRC: uint32Ptr(0x65f83afb),
-		Period:       500 * time.Millisecond,
+		ClockRate: 90000,
+		LocalSSRC: uint32Ptr(0x65f83afb),
+		Period:    500 * time.Millisecond,
 		TimeNow: func() time.Time {
 			return time.Date(2008, 0o5, 20, 22, 15, 21, 0, time.UTC)
 		},
@@ -292,7 +292,7 @@ func TestRTCPReceiverOverflowPacketLost(t *testing.T) {
 		Payload: []byte("\x00\x00"),
 	}
 	ts = time.Date(2008, 0o5, 20, 22, 15, 20, 0, time.UTC)
-	err = rr.ProcessPacket(&rtpPkt, ts, true)
+	err = rr.ProcessPacketRTP(&rtpPkt, ts, true)
 	require.NoError(t, err)
 
 	rtpPkt = rtp.Packet{
@@ -307,7 +307,7 @@ func TestRTCPReceiverOverflowPacketLost(t *testing.T) {
 		Payload: []byte("\x00\x00"),
 	}
 	ts = time.Date(2008, 0o5, 20, 22, 15, 20, 0, time.UTC)
-	err = rr.ProcessPacket(&rtpPkt, ts, true)
+	err = rr.ProcessPacketRTP(&rtpPkt, ts, true)
 	require.NoError(t, err)
 
 	<-done
@@ -317,9 +317,9 @@ func TestRTCPReceiverJitter(t *testing.T) {
 	done := make(chan struct{})
 
 	rr := &RTCPReceiver{
-		ClockRate:    90000,
-		ReceiverSSRC: uint32Ptr(0x65f83afb),
-		Period:       500 * time.Millisecond,
+		ClockRate: 90000,
+		LocalSSRC: uint32Ptr(0x65f83afb),
+		Period:    500 * time.Millisecond,
 		TimeNow: func() time.Time {
 			return time.Date(2008, 0o5, 20, 22, 15, 22, 0, time.UTC)
 		},
@@ -365,7 +365,7 @@ func TestRTCPReceiverJitter(t *testing.T) {
 		Payload: []byte("\x00\x00"),
 	}
 	ts = time.Date(2008, 0o5, 20, 22, 15, 20, 0, time.UTC)
-	err = rr.ProcessPacket(&rtpPkt, ts, true)
+	err = rr.ProcessPacketRTP(&rtpPkt, ts, true)
 	require.NoError(t, err)
 
 	rtpPkt = rtp.Packet{
@@ -380,7 +380,7 @@ func TestRTCPReceiverJitter(t *testing.T) {
 		Payload: []byte("\x00\x00"),
 	}
 	ts = time.Date(2008, 0o5, 20, 22, 15, 21, 0, time.UTC)
-	err = rr.ProcessPacket(&rtpPkt, ts, true)
+	err = rr.ProcessPacketRTP(&rtpPkt, ts, true)
 	require.NoError(t, err)
 
 	rtpPkt = rtp.Packet{
@@ -395,7 +395,7 @@ func TestRTCPReceiverJitter(t *testing.T) {
 		Payload: []byte("\x00\x00"),
 	}
 	ts = time.Date(2008, 0o5, 20, 22, 15, 22, 0, time.UTC)
-	err = rr.ProcessPacket(&rtpPkt, ts, false)
+	err = rr.ProcessPacketRTP(&rtpPkt, ts, false)
 	require.NoError(t, err)
 
 	<-done

internal/rtcpsender/rtcpsender.go

@@ -26,11 +26,11 @@ type RTCPSender struct {
 	mutex sync.RWMutex
 
 	// data from RTP packets
-	initialized        bool
+	firstRTPPacketSent bool
 	lastTimeRTP        uint32
 	lastTimeNTP        time.Time
 	lastTimeSystem     time.Time
-	senderSSRC         uint32
+	localSSRC          uint32
 	lastSequenceNumber uint16
 	packetCount        uint32
 	octetCount         uint32
@@ -81,7 +81,7 @@ func (rs *RTCPSender) report() rtcp.Packet {
 	rs.mutex.Lock()
 	defer rs.mutex.Unlock()
 
-	if !rs.initialized {
+	if !rs.firstRTPPacketSent {
 		return nil
 	}
 
@@ -90,7 +90,7 @@ func (rs *RTCPSender) report() rtcp.Packet {
 	rtpTime := rs.lastTimeRTP + uint32(systemTimeDiff.Seconds()*float64(rs.ClockRate))
 
 	return &rtcp.SenderReport{
-		SSRC:        rs.senderSSRC,
+		SSRC:        rs.localSSRC,
 		NTPTime:     ntpTimeGoToRTCP(ntpTime),
 		RTPTime:     rtpTime,
 		PacketCount: rs.packetCount,
@@ -98,17 +98,17 @@ func (rs *RTCPSender) report() rtcp.Packet {
 	}
 }
 
-// ProcessPacket extracts data from RTP packets.
-func (rs *RTCPSender) ProcessPacket(pkt *rtp.Packet, ntp time.Time, ptsEqualsDTS bool) {
+// ProcessPacketRTP extracts data from RTP packets.
+func (rs *RTCPSender) ProcessPacketRTP(pkt *rtp.Packet, ntp time.Time, ptsEqualsDTS bool) {
 	rs.mutex.Lock()
 	defer rs.mutex.Unlock()
 
 	if ptsEqualsDTS {
-		rs.initialized = true
+		rs.firstRTPPacketSent = true
 		rs.lastTimeRTP = pkt.Timestamp
 		rs.lastTimeNTP = ntp
 		rs.lastTimeSystem = rs.TimeNow()
-		rs.senderSSRC = pkt.SSRC
+		rs.localSSRC = pkt.SSRC
 	}
 
 	rs.lastSequenceNumber = pkt.SequenceNumber
@@ -117,16 +117,27 @@ func (rs *RTCPSender) ProcessPacket(pkt *rtp.Packet, ntp time.Time, ptsEqualsDTS
 	rs.octetCount += uint32(len(pkt.Payload))
 }
 
-// SenderSSRC returns the SSRC of outgoing RTP packets.
-func (rs *RTCPSender) SenderSSRC() (uint32, bool) {
-	rs.mutex.RLock()
-	defer rs.mutex.RUnlock()
-	return rs.senderSSRC, rs.initialized
+// Stats are statistics.
+type Stats struct {
+	LocalSSRC          uint32
+	LastSequenceNumber uint16
+	LastRTP            uint32
+	LastNTP            time.Time
 }
 
-// LastPacketData returns metadata of the last RTP packet.
-func (rs *RTCPSender) LastPacketData() (uint16, uint32, time.Time, bool) {
+// Stats returns statistics.
+func (rs *RTCPSender) Stats() *Stats {
 	rs.mutex.RLock()
 	defer rs.mutex.RUnlock()
-	return rs.lastSequenceNumber, rs.lastTimeRTP, rs.lastTimeNTP, rs.initialized
+
+	if !rs.firstRTPPacketSent {
+		return nil
+	}
+
+	return &Stats{
+		LocalSSRC:          rs.localSSRC,
+		LastSequenceNumber: rs.lastSequenceNumber,
+		LastRTP:            rs.lastTimeRTP,
+		LastNTP:            rs.lastTimeNTP,
+	}
 }

internal/rtcpsender/rtcpsender_test.go

@@ -63,7 +63,7 @@ func TestRTCPSender(t *testing.T) {
 		Payload: []byte("\x00\x00"),
 	}
 	ts := time.Date(2008, 0o5, 20, 22, 15, 20, 0, time.UTC)
-	rs.ProcessPacket(&rtpPkt, ts, true)
+	rs.ProcessPacketRTP(&rtpPkt, ts, true)
 
 	setCurTime(time.Date(2008, 5, 20, 22, 16, 22, 0, time.UTC))
 	rtpPkt = rtp.Packet{
@@ -78,7 +78,7 @@ func TestRTCPSender(t *testing.T) {
 		Payload: []byte("\x00\x00"),
 	}
 	ts = time.Date(2008, 0o5, 20, 22, 15, 21, 0, time.UTC)
-	rs.ProcessPacket(&rtpPkt, ts, true)
+	rs.ProcessPacketRTP(&rtpPkt, ts, true)
 
 	rtpPkt = rtp.Packet{
 		Header: rtp.Header{
@@ -92,7 +92,7 @@ func TestRTCPSender(t *testing.T) {
 		Payload: []byte("\x00\x00"),
 	}
 	ts = time.Date(2008, 0o5, 20, 22, 15, 22, 0, time.UTC)
-	rs.ProcessPacket(&rtpPkt, ts, false)
+	rs.ProcessPacketRTP(&rtpPkt, ts, false)
 
 	setCurTime(time.Date(2008, 5, 20, 22, 16, 24, 0, time.UTC))
 

internal/rtplossdetector/lossdetector.go

@@ -13,7 +13,7 @@ type LossDetector struct {
 
 // Process processes a RTP packet.
 // It returns the number of lost packets.
-func (r *LossDetector) Process(pkt *rtp.Packet) int {
+func (r *LossDetector) Process(pkt *rtp.Packet) uint {
 	if !r.initialized {
 		r.initialized = true
 		r.expectedSeqNum = pkt.SequenceNumber + 1
@@ -23,7 +23,7 @@ func (r *LossDetector) Process(pkt *rtp.Packet) int {
 	if pkt.SequenceNumber != r.expectedSeqNum {
 		diff := pkt.SequenceNumber - r.expectedSeqNum
 		r.expectedSeqNum = pkt.SequenceNumber + 1
-		return int(diff)
+		return uint(diff)
 	}
 
 	r.expectedSeqNum = pkt.SequenceNumber + 1

internal/rtplossdetector/lossdetector_test.go

@@ -15,19 +15,19 @@ func TestLossDetector(t *testing.T) {
 			SequenceNumber: 65530,
 		},
 	})
-	require.Equal(t, 0, c)
+	require.Equal(t, uint(0), c)
 
 	c = d.Process(&rtp.Packet{
 		Header: rtp.Header{
 			SequenceNumber: 65531,
 		},
 	})
-	require.Equal(t, 0, c)
+	require.Equal(t, uint(0), c)
 
 	c = d.Process(&rtp.Packet{
 		Header: rtp.Header{
 			SequenceNumber: 65535,
 		},
 	})
-	require.Equal(t, 3, c)
+	require.Equal(t, uint(3), c)
 }

internal/rtpreorderer/reorderer.go

@@ -27,7 +27,7 @@ func (r *Reorderer) Initialize() {
 
 // Process processes a RTP packet.
 // It returns a sequence of ordered packets and the number of lost packets.
-func (r *Reorderer) Process(pkt *rtp.Packet) ([]*rtp.Packet, int) {
+func (r *Reorderer) Process(pkt *rtp.Packet) ([]*rtp.Packet, uint) {
 	if !r.initialized {
 		r.initialized = true
 		r.expectedSeqNum = pkt.SequenceNumber + 1
@@ -86,7 +86,7 @@ func (r *Reorderer) Process(pkt *rtp.Packet) ([]*rtp.Packet, int) {
 		ret[pos] = pkt
 
 		r.expectedSeqNum = pkt.SequenceNumber + 1
-		return ret, int(relPos) - n + 1
+		return ret, uint(int(relPos) - n + 1)
 	}
 
 	// there's a missing packet

internal/rtpreorderer/reorderer_test.go

@@ -164,7 +164,7 @@ func TestReorder(t *testing.T) {
 	for _, entry := range sequence {
 		out, missing := r.Process(entry.in)
 		require.Equal(t, entry.out, out)
-		require.Equal(t, 0, missing)
+		require.Equal(t, uint(0), missing)
 	}
 }
 
@@ -173,7 +173,7 @@ func TestBufferIsFull(t *testing.T) {
 	r.Initialize()
 	r.absPos = 25
 	sn := uint16(1564)
-	toMiss := 34
+	toMiss := uint(34)
 
 	out, missing := r.Process(&rtp.Packet{
 		Header: rtp.Header{
@@ -185,19 +185,19 @@ func TestBufferIsFull(t *testing.T) {
 			SequenceNumber: sn,
 		},
 	}}, out)
-	require.Equal(t, 0, missing)
+	require.Equal(t, uint(0), missing)
 	sn++
 
 	var expected []*rtp.Packet
 
-	for i := 0; i < 64-toMiss; i++ {
+	for i := uint(0); i < 64-toMiss; i++ {
 		out, missing = r.Process(&rtp.Packet{
 			Header: rtp.Header{
 				SequenceNumber: sn + uint16(toMiss),
 			},
 		})
 		require.Equal(t, []*rtp.Packet(nil), out)
-		require.Equal(t, 0, missing)
+		require.Equal(t, uint(0), missing)
 
 		expected = append(expected, &rtp.Packet{
 			Header: rtp.Header{
@@ -242,7 +242,7 @@ func TestReset(t *testing.T) {
 			},
 		})
 		require.Equal(t, []*rtp.Packet(nil), out)
-		require.Equal(t, 0, missing)
+		require.Equal(t, uint(0), missing)
 		sn++
 	}
 
@@ -256,5 +256,5 @@ func TestReset(t *testing.T) {
 			SequenceNumber: sn,
 		},
 	}}, out)
-	require.Equal(t, 0, missing)
+	require.Equal(t, uint(0), missing)
 }

pkg/liberrors/client.go

@@ -251,7 +251,7 @@ func (e ErrClientWriteQueueFull) Error() string {
 
 // ErrClientRTPPacketsLost is an error that can be returned by a client.
 type ErrClientRTPPacketsLost struct {
-	Lost int
+	Lost uint
 }
 
 // Error implements the error interface.

pkg/rtcpreceiver/rtcpreceiver.go

@@ -24,7 +24,7 @@ func New(
 ) (*RTCPReceiver, error) {
 	rr := &rtcpreceiver.RTCPReceiver{
 		ClockRate:       clockRate,
-		ReceiverSSRC:    receiverSSRC,
+		LocalSSRC:       receiverSSRC,
 		Period:          period,
 		TimeNow:         timeNow,
 		WritePacketRTCP: writePacketRTCP,
@@ -44,7 +44,7 @@ func (rr *RTCPReceiver) Close() {
 
 // ProcessPacket extracts the needed data from RTP packets.
 func (rr *RTCPReceiver) ProcessPacket(pkt *rtp.Packet, system time.Time, ptsEqualsDTS bool) error {
-	return (*rtcpreceiver.RTCPReceiver)(rr).ProcessPacket(pkt, system, ptsEqualsDTS)
+	return (*rtcpreceiver.RTCPReceiver)(rr).ProcessPacketRTP(pkt, system, ptsEqualsDTS)
 }
 
 // ProcessSenderReport extracts the needed data from RTCP sender reports.
@@ -59,5 +59,9 @@ func (rr *RTCPReceiver) PacketNTP(ts uint32) (time.Time, bool) {
 
 // SenderSSRC returns the SSRC of outgoing RTP packets.
 func (rr *RTCPReceiver) SenderSSRC() (uint32, bool) {
-	return (*rtcpreceiver.RTCPReceiver)(rr).SenderSSRC()
+	stats := (*rtcpreceiver.RTCPReceiver)(rr).Stats()
+	if stats == nil {
+		return 0, false
+	}
+	return stats.RemoteSSRC, true
 }

pkg/rtcpsender/rtcpsender.go

@@ -39,15 +39,25 @@ func (rs *RTCPSender) Close() {
 
 // ProcessPacket extracts data from RTP packets.
 func (rs *RTCPSender) ProcessPacket(pkt *rtp.Packet, ntp time.Time, ptsEqualsDTS bool) {
-	(*rtcpsender.RTCPSender)(rs).ProcessPacket(pkt, ntp, ptsEqualsDTS)
+	(*rtcpsender.RTCPSender)(rs).ProcessPacketRTP(pkt, ntp, ptsEqualsDTS)
 }
 
 // SenderSSRC returns the SSRC of outgoing RTP packets.
 func (rs *RTCPSender) SenderSSRC() (uint32, bool) {
-	return (*rtcpsender.RTCPSender)(rs).SenderSSRC()
+	stats := (*rtcpsender.RTCPSender)(rs).Stats()
+	if stats == nil {
+		return 0, false
+	}
+
+	return stats.LocalSSRC, true
 }
 
 // LastPacketData returns metadata of the last RTP packet.
 func (rs *RTCPSender) LastPacketData() (uint16, uint32, time.Time, bool) {
-	return (*rtcpsender.RTCPSender)(rs).LastPacketData()
+	stats := (*rtcpsender.RTCPSender)(rs).Stats()
+	if stats == nil {
+		return 0, 0, time.Time{}, false
+	}
+
+	return stats.LastSequenceNumber, stats.LastRTP, stats.LastNTP, true
 }

pkg/rtplossdetector/lossdetector.go

@@ -18,6 +18,6 @@ func New() *LossDetector {
 
 // Process processes a RTP packet.
 // It returns the number of lost packets.
-func (r *LossDetector) Process(pkt *rtp.Packet) int {
+func (r *LossDetector) Process(pkt *rtp.Packet) uint {
 	return (*rtplossdetector.LossDetector)(r).Process(pkt)
 }

pkg/rtplossdetector/lossdetector_test.go

@@ -15,19 +15,19 @@ func TestLossDetector(t *testing.T) {
 			SequenceNumber: 65530,
 		},
 	})
-	require.Equal(t, 0, c)
+	require.Equal(t, uint(0), c)
 
 	c = d.Process(&rtp.Packet{
 		Header: rtp.Header{
 			SequenceNumber: 65531,
 		},
 	})
-	require.Equal(t, 0, c)
+	require.Equal(t, uint(0), c)
 
 	c = d.Process(&rtp.Packet{
 		Header: rtp.Header{
 			SequenceNumber: 65535,
 		},
 	})
-	require.Equal(t, 3, c)
+	require.Equal(t, uint(3), c)
 }

pkg/rtpreorderer/reorderer.go

@@ -22,6 +22,6 @@ func New() *Reorderer {
 
 // Process processes a RTP packet.
 // It returns a sequence of ordered packets and the number of lost packets.
-func (r *Reorderer) Process(pkt *rtp.Packet) ([]*rtp.Packet, int) {
+func (r *Reorderer) Process(pkt *rtp.Packet) ([]*rtp.Packet, uint) {
 	return (*rtpreorderer.Reorderer)(r).Process(pkt)
 }

server_conn.go

@@ -101,11 +101,15 @@ func (sc *ServerConn) NetConn() net.Conn {
 }
 
 // BytesReceived returns the number of read bytes.
+//
+// Deprecated: replaced by Stats()
 func (sc *ServerConn) BytesReceived() uint64 {
 	return sc.bc.BytesReceived()
 }
 
 // BytesSent returns the number of written bytes.
+//
+// Deprecated: replaced by Stats()
 func (sc *ServerConn) BytesSent() uint64 {
 	return sc.bc.BytesSent()
 }
@@ -120,6 +124,14 @@ func (sc *ServerConn) UserData() interface{} {
 	return sc.userData
 }
 
+// Stats returns connection statistics.
+func (sc *ServerConn) Stats() *StatsConn {
+	return &StatsConn{
+		BytesReceived: sc.bc.BytesReceived(),
+		BytesSent:     sc.bc.BytesSent(),
+	}
+}
+
 func (sc *ServerConn) ip() net.IP {
 	return sc.remoteAddr.IP
 }

server_conn_reader.go

@@ -3,7 +3,6 @@ package gortsplib
 import (
 	"errors"
 	"fmt"
-	"sync/atomic"
 	"time"
 
 	"github.com/bluenviron/gortsplib/v4/pkg/base"
@@ -131,8 +130,6 @@ func (cr *serverConnReader) readFuncTCP() error {
 			return liberrors.ErrServerUnexpectedResponse{}
 
 		case *base.InterleavedFrame:
-			atomic.AddUint64(cr.sc.session.bytesReceived, uint64(len(what.Payload)))
-
 			if cb, ok := cr.sc.session.tcpCallbackByChannel[what.Channel]; ok {
 				cb(what.Payload)
 			}

server_play_test.go

@@ -609,10 +609,11 @@ func TestServerPlay(t *testing.T) {
 						close(nconnOpened)
 					},
 					onConnClose: func(ctx *ServerHandlerOnConnCloseCtx) {
-						require.Greater(t, ctx.Conn.BytesSent(), uint64(810))
-						require.Less(t, ctx.Conn.BytesSent(), uint64(1150))
-						require.Greater(t, ctx.Conn.BytesReceived(), uint64(440))
-						require.Less(t, ctx.Conn.BytesReceived(), uint64(660))
+						s := ctx.Conn.Stats()
+						require.Greater(t, s.BytesSent, uint64(810))
+						require.Less(t, s.BytesSent, uint64(1150))
+						require.Greater(t, s.BytesReceived, uint64(440))
+						require.Less(t, s.BytesReceived, uint64(660))
 
 						close(nconnClosed)
 					},
@@ -621,10 +622,11 @@ func TestServerPlay(t *testing.T) {
 					},
 					onSessionClose: func(ctx *ServerHandlerOnSessionCloseCtx) {
 						if transport != "multicast" {
-							require.Greater(t, ctx.Session.BytesSent(), uint64(50))
-							require.Less(t, ctx.Session.BytesSent(), uint64(60))
-							require.Greater(t, ctx.Session.BytesReceived(), uint64(15))
-							require.Less(t, ctx.Session.BytesReceived(), uint64(25))
+							s := ctx.Session.Stats()
+							require.Greater(t, s.BytesSent, uint64(50))
+							require.Less(t, s.BytesSent, uint64(60))
+							require.Greater(t, s.BytesReceived, uint64(15))
+							require.Less(t, s.BytesReceived, uint64(25))
 						}
 
 						close(sessionClosed)
@@ -2325,7 +2327,7 @@ func TestServerPlayNoInterleavedIDs(t *testing.T) {
 	}
 }
 
-func TestServerPlayBytesSent(t *testing.T) {
+func TestServerPlayStreamStats(t *testing.T) {
 	var stream *ServerStream
 
 	s := &Server{
@@ -2355,7 +2357,6 @@ func TestServerPlayBytesSent(t *testing.T) {
 	err := s.Start()
 	require.NoError(t, err)
 	defer s.Close()
-
 	stream = NewServerStream(s, &description.Session{Medias: []*description.Media{testH264Media}})
 	defer stream.Close()
 
@@ -2393,5 +2394,6 @@ func TestServerPlayBytesSent(t *testing.T) {
 	err = stream.WritePacketRTP(stream.Description().Medias[0], &testRTPPacket)
 	require.NoError(t, err)
 
-	require.Equal(t, uint64(16*2), stream.BytesSent())
+	st := stream.Stats()
+	require.Equal(t, uint64(16*2), st.BytesSent)
 }

server_record_test.go

@@ -545,10 +545,11 @@ func TestServerRecord(t *testing.T) {
 						close(nconnOpened)
 					},
 					onConnClose: func(ctx *ServerHandlerOnConnCloseCtx) {
-						require.Greater(t, ctx.Conn.BytesSent(), uint64(510))
-						require.Less(t, ctx.Conn.BytesSent(), uint64(560))
-						require.Greater(t, ctx.Conn.BytesReceived(), uint64(1000))
-						require.Less(t, ctx.Conn.BytesReceived(), uint64(1200))
+						s := ctx.Conn.Stats()
+						require.Greater(t, s.BytesSent, uint64(510))
+						require.Less(t, s.BytesSent, uint64(560))
+						require.Greater(t, s.BytesReceived, uint64(1000))
+						require.Less(t, s.BytesReceived, uint64(1200))
 
 						close(nconnClosed)
 					},
@@ -556,10 +557,11 @@ func TestServerRecord(t *testing.T) {
 						close(sessionOpened)
 					},
 					onSessionClose: func(ctx *ServerHandlerOnSessionCloseCtx) {
-						require.Greater(t, ctx.Session.BytesSent(), uint64(75))
-						require.Less(t, ctx.Session.BytesSent(), uint64(130))
-						require.Greater(t, ctx.Session.BytesReceived(), uint64(70))
-						require.Less(t, ctx.Session.BytesReceived(), uint64(80))
+						s := ctx.Session.Stats()
+						require.Greater(t, s.BytesSent, uint64(75))
+						require.Less(t, s.BytesSent, uint64(130))
+						require.Greater(t, s.BytesReceived, uint64(70))
+						require.Less(t, s.BytesReceived, uint64(80))
 
 						close(sessionClosed)
 					},

server_session.go

@@ -14,6 +14,8 @@ import (
 	"github.com/pion/rtcp"
 	"github.com/pion/rtp"
 
+	"github.com/bluenviron/gortsplib/v4/internal/rtcpreceiver"
+	"github.com/bluenviron/gortsplib/v4/internal/rtcpsender"
 	"github.com/bluenviron/gortsplib/v4/pkg/base"
 	"github.com/bluenviron/gortsplib/v4/pkg/description"
 	"github.com/bluenviron/gortsplib/v4/pkg/format"
@@ -186,7 +188,7 @@ func generateRTPInfo(
 			Scheme: u.Scheme,
 			Host:   u.Host,
 			Path: setuppedPath + "/trackID=" +
-				strconv.FormatInt(int64(setuppedStream.streamMedias[sm.media].trackID), 10),
+				strconv.FormatInt(int64(setuppedStream.medias[sm.media].trackID), 10),
 		}).String()
 		ri = append(ri, entry)
 	}
@@ -235,8 +237,6 @@ type ServerSession struct {
 	secretID              string // must not be shared, allows to take ownership of the session
 	ctx                   context.Context
 	ctxCancel             func()
-	bytesReceived         *uint64
-	bytesSent             *uint64
 	userData              interface{}
 	conns                 map[*ServerConn]struct{}
 	state                 ServerSessionState
@@ -272,11 +272,10 @@ func (ss *ServerSession) initialize() {
 	ss.secretID = secretID
 	ss.ctx = ctx
 	ss.ctxCancel = ctxCancel
-	ss.bytesReceived = new(uint64)
-	ss.bytesSent = new(uint64)
 	ss.conns = make(map[*ServerConn]struct{})
 	ss.lastRequestTime = ss.s.timeNow()
 	ss.udpCheckStreamTimer = emptyTimer()
+
 	ss.chHandleRequest = make(chan sessionRequestReq)
 	ss.chRemoveConn = make(chan *ServerConn)
 	ss.chStartWriter = make(chan struct{})
@@ -291,13 +290,25 @@ func (ss *ServerSession) Close() {
 }
 
 // BytesReceived returns the number of read bytes.
+//
+// Deprecated: replaced by Stats()
 func (ss *ServerSession) BytesReceived() uint64 {
-	return atomic.LoadUint64(ss.bytesReceived)
+	v := uint64(0)
+	for _, sm := range ss.setuppedMedias {
+		v += atomic.LoadUint64(sm.bytesReceived)
+	}
+	return v
 }
 
 // BytesSent returns the number of written bytes.
+//
+// Deprecated: replaced by Stats()
 func (ss *ServerSession) BytesSent() uint64 {
-	return atomic.LoadUint64(ss.bytesSent)
+	v := uint64(0)
+	for _, sm := range ss.setuppedMedias {
+		v += atomic.LoadUint64(sm.bytesSent)
+	}
+	return v
 }
 
 // State returns the state of the session.
@@ -349,25 +360,190 @@ func (ss *ServerSession) UserData() interface{} {
 	return ss.userData
 }
 
-func (ss *ServerSession) onPacketLost(err error) {
-	if h, ok := ss.s.Handler.(ServerHandlerOnPacketLost); ok {
-		h.OnPacketLost(&ServerHandlerOnPacketLostCtx{
-			Session: ss,
-			Error:   err,
-		})
-	} else {
-		log.Println(err.Error())
-	}
-}
+// Stats returns server session statistics.
+func (ss *ServerSession) Stats() *StatsSession {
+	return &StatsSession{
+		BytesReceived: func() uint64 {
+			v := uint64(0)
+			for _, sm := range ss.setuppedMedias {
+				v += atomic.LoadUint64(sm.bytesReceived)
+			}
+			return v
+		}(),
+		BytesSent: func() uint64 {
+			v := uint64(0)
+			for _, sm := range ss.setuppedMedias {
+				v += atomic.LoadUint64(sm.bytesSent)
+			}
+			return v
+		}(),
+		RTPPacketsReceived: func() uint64 {
+			v := uint64(0)
+			for _, sm := range ss.setuppedMedias {
+				for _, f := range sm.formats {
+					v += atomic.LoadUint64(f.rtpPacketsReceived)
+				}
+			}
+			return v
+		}(),
+		RTPPacketsSent: func() uint64 {
+			v := uint64(0)
+			for _, sm := range ss.setuppedMedias {
+				for _, f := range sm.formats {
+					v += atomic.LoadUint64(f.rtpPacketsSent)
+				}
+			}
+			return v
+		}(),
+		RTPPacketsLost: func() uint64 {
+			v := uint64(0)
+			for _, sm := range ss.setuppedMedias {
+				for _, f := range sm.formats {
+					v += atomic.LoadUint64(f.rtpPacketsLost)
+				}
+			}
+			return v
+		}(),
+		RTPPacketsInError: func() uint64 {
+			v := uint64(0)
+			for _, sm := range ss.setuppedMedias {
+				v += atomic.LoadUint64(sm.rtpPacketsInError)
+			}
+			return v
+		}(),
+		RTPJitter: func() float64 {
+			v := float64(0)
+			n := float64(0)
+			for _, sm := range ss.setuppedMedias {
+				for _, fo := range sm.formats {
+					if fo.rtcpReceiver != nil {
+						stats := fo.rtcpReceiver.Stats()
+						if stats != nil {
+							v += stats.Jitter
+							n++
+						}
+					}
+				}
+			}
+			return v / n
+		}(),
+		RTCPPacketsReceived: func() uint64 {
+			v := uint64(0)
+			for _, sm := range ss.setuppedMedias {
+				v += atomic.LoadUint64(sm.rtcpPacketsReceived)
+			}
+			return v
+		}(),
+		RTCPPacketsSent: func() uint64 {
+			v := uint64(0)
+			for _, sm := range ss.setuppedMedias {
+				v += atomic.LoadUint64(sm.rtcpPacketsSent)
+			}
+			return v
+		}(),
+		RTCPPacketsInError: func() uint64 {
+			v := uint64(0)
+			for _, sm := range ss.setuppedMedias {
+				v += atomic.LoadUint64(sm.rtcpPacketsInError)
+			}
+			return v
+		}(),
+		Medias: func() map[*description.Media]StatsSessionMedia { //nolint:dupl
+			ret := make(map[*description.Media]StatsSessionMedia, len(ss.setuppedMedias))
 
-func (ss *ServerSession) onDecodeError(err error) {
-	if h, ok := ss.s.Handler.(ServerHandlerOnDecodeError); ok {
-		h.OnDecodeError(&ServerHandlerOnDecodeErrorCtx{
-			Session: ss,
-			Error:   err,
-		})
-	} else {
-		log.Println(err.Error())
+			for med, sm := range ss.setuppedMedias {
+				ret[med] = StatsSessionMedia{
+					BytesReceived:       atomic.LoadUint64(sm.bytesReceived),
+					BytesSent:           atomic.LoadUint64(sm.bytesSent),
+					RTPPacketsInError:   atomic.LoadUint64(sm.rtpPacketsInError),
+					RTCPPacketsReceived: atomic.LoadUint64(sm.rtcpPacketsReceived),
+					RTCPPacketsSent:     atomic.LoadUint64(sm.rtcpPacketsSent),
+					RTCPPacketsInError:  atomic.LoadUint64(sm.rtcpPacketsInError),
+					Formats: func() map[format.Format]StatsSessionFormat {
+						ret := make(map[format.Format]StatsSessionFormat, len(sm.formats))
+
+						for _, fo := range sm.formats {
+							recvStats := func() *rtcpreceiver.Stats {
+								if fo.rtcpReceiver != nil {
+									return fo.rtcpReceiver.Stats()
+								}
+								return nil
+							}()
+							rtcpSender := func() *rtcpsender.RTCPSender {
+								if ss.setuppedStream != nil {
+									return ss.setuppedStream.medias[med].formats[fo.format.PayloadType()].rtcpSender
+								}
+								return nil
+							}()
+							sentStats := func() *rtcpsender.Stats {
+								if rtcpSender != nil {
+									return rtcpSender.Stats()
+								}
+								return nil
+							}()
+
+							ret[fo.format] = StatsSessionFormat{ //nolint:dupl
+								RTPPacketsReceived: atomic.LoadUint64(fo.rtpPacketsReceived),
+								RTPPacketsSent:     atomic.LoadUint64(fo.rtpPacketsSent),
+								RTPPacketsLost:     atomic.LoadUint64(fo.rtpPacketsLost),
+								LocalSSRC: func() uint32 {
+									if fo.rtcpReceiver != nil {
+										return *fo.rtcpReceiver.LocalSSRC
+									}
+									if sentStats != nil {
+										return sentStats.LocalSSRC
+									}
+									return 0
+								}(),
+								RemoteSSRC: func() uint32 {
+									if recvStats != nil {
+										return recvStats.RemoteSSRC
+									}
+									return 0
+								}(),
+								RTPPacketsLastSequenceNumber: func() uint16 {
+									if recvStats != nil {
+										return recvStats.LastSequenceNumber
+									}
+									if sentStats != nil {
+										return sentStats.LastSequenceNumber
+									}
+									return 0
+								}(),
+								RTPPacketsLastRTP: func() uint32 {
+									if recvStats != nil {
+										return recvStats.LastRTP
+									}
+									if sentStats != nil {
+										return sentStats.LastRTP
+									}
+									return 0
+								}(),
+								RTPPacketsLastNTP: func() time.Time {
+									if recvStats != nil {
+										return recvStats.LastNTP
+									}
+									if sentStats != nil {
+										return sentStats.LastNTP
+									}
+									return time.Time{}
+								}(),
+								RTPJitter: func() float64 {
+									if recvStats != nil {
+										return recvStats.Jitter
+									}
+									return 0
+								}(),
+							}
+						}
+
+						return ret
+					}(),
+				}
+			}
+
+			return ret
+		}(),
 	}
 }
 
@@ -848,7 +1024,7 @@ func (ss *ServerSession) handleRequestInner(sc *ServerConn, req *base.Request) (
 		th := headers.Transport{}
 
 		if ss.state == ServerSessionStatePrePlay {
-			ssrc, ok := stream.senderSSRC(medi)
+			ssrc, ok := stream.localSSRC(medi)
 			if ok {
 				th.SSRC = &ssrc
 			}
@@ -894,7 +1070,7 @@ func (ss *ServerSession) handleRequestInner(sc *ServerConn, req *base.Request) (
 			th.Delivery = &de
 			v := uint(127)
 			th.TTL = &v
-			d := stream.streamMedias[medi].multicastWriter.ip()
+			d := stream.medias[medi].multicastWriter.ip()
 			th.Destination = &d
 			th.Ports = &[2]int{ss.s.MulticastRTPPort, ss.s.MulticastRTCPPort}
 
@@ -1229,7 +1405,7 @@ func (ss *ServerSession) findFreeChannelPair() int {
 	}
 }
 
-// OnPacketRTPAny sets the callback that is called when a RTP packet is read from any setupped media.
+// OnPacketRTPAny sets a callback that is called when a RTP packet is read from any setupped media.
 func (ss *ServerSession) OnPacketRTPAny(cb OnPacketRTPAnyFunc) {
 	for _, sm := range ss.setuppedMedias {
 		cmedia := sm.media
@@ -1241,7 +1417,7 @@ func (ss *ServerSession) OnPacketRTPAny(cb OnPacketRTPAnyFunc) {
 	}
 }
 
-// OnPacketRTCPAny sets the callback that is called when a RTCP packet is read from any setupped media.
+// OnPacketRTCPAny sets a callback that is called when a RTCP packet is read from any setupped media.
 func (ss *ServerSession) OnPacketRTCPAny(cb OnPacketRTCPAnyFunc) {
 	for _, sm := range ss.setuppedMedias {
 		cmedia := sm.media
@@ -1251,24 +1427,25 @@ func (ss *ServerSession) OnPacketRTCPAny(cb OnPacketRTCPAnyFunc) {
 	}
 }
 
-// OnPacketRTP sets the callback that is called when a RTP packet is read.
+// OnPacketRTP sets a callback that is called when a RTP packet is read.
 func (ss *ServerSession) OnPacketRTP(medi *description.Media, forma format.Format, cb OnPacketRTPFunc) {
 	sm := ss.setuppedMedias[medi]
 	st := sm.formats[forma.PayloadType()]
 	st.onPacketRTP = cb
 }
 
-// OnPacketRTCP sets the callback that is called when a RTCP packet is read.
+// OnPacketRTCP sets a callback that is called when a RTCP packet is read.
 func (ss *ServerSession) OnPacketRTCP(medi *description.Media, cb OnPacketRTCPFunc) {
 	sm := ss.setuppedMedias[medi]
 	sm.onPacketRTCP = cb
 }
 
-func (ss *ServerSession) writePacketRTP(medi *description.Media, byts []byte) error {
+func (ss *ServerSession) writePacketRTP(medi *description.Media, payloadType uint8, byts []byte) error {
 	sm := ss.setuppedMedias[medi]
+	sf := sm.formats[payloadType]
 
-	ok := sm.ss.writer.push(func() error {
-		return sm.writePacketRTPInQueue(byts)
+	ok := ss.writer.push(func() error {
+		return sf.writePacketRTPInQueue(byts)
 	})
 	if !ok {
 		return liberrors.ErrServerWriteQueueFull{}
@@ -1286,7 +1463,7 @@ func (ss *ServerSession) WritePacketRTP(medi *description.Media, pkt *rtp.Packet
 	}
 	byts = byts[:n]
 
-	return ss.writePacketRTP(medi, byts)
+	return ss.writePacketRTP(medi, pkt.PayloadType, byts)
 }
 
 func (ss *ServerSession) writePacketRTCP(medi *description.Media, byts []byte) error {

server_session_format.go

@@ -1,6 +1,8 @@
 package gortsplib
 
 import (
+	"log"
+	"sync/atomic"
 	"time"
 
 	"github.com/pion/rtcp"
@@ -18,12 +20,30 @@ type serverSessionFormat struct {
 	format      format.Format
 	onPacketRTP OnPacketRTPFunc
 
-	udpReorderer    *rtpreorderer.Reorderer
-	tcpLossDetector *rtplossdetector.LossDetector
-	rtcpReceiver    *rtcpreceiver.RTCPReceiver
+	udpReorderer          *rtpreorderer.Reorderer
+	tcpLossDetector       *rtplossdetector.LossDetector
+	rtcpReceiver          *rtcpreceiver.RTCPReceiver
+	writePacketRTPInQueue func([]byte) error
+	rtpPacketsReceived    *uint64
+	rtpPacketsSent        *uint64
+	rtpPacketsLost        *uint64
+}
+
+func (sf *serverSessionFormat) initialize() {
+	sf.rtpPacketsReceived = new(uint64)
+	sf.rtpPacketsSent = new(uint64)
+	sf.rtpPacketsLost = new(uint64)
 }
 
 func (sf *serverSessionFormat) start() {
+	switch *sf.sm.ss.setuppedTransport {
+	case TransportUDP, TransportUDPMulticast:
+		sf.writePacketRTPInQueue = sf.writePacketRTPInQueueUDP
+
+	default:
+		sf.writePacketRTPInQueue = sf.writePacketRTPInQueueTCP
+	}
+
 	if sf.sm.ss.state != ServerSessionStatePlay {
 		if *sf.sm.ss.setuppedTransport == TransportUDP || *sf.sm.ss.setuppedTransport == TransportUDPMulticast {
 			sf.udpReorderer = &rtpreorderer.Reorderer{}
@@ -56,38 +76,76 @@ func (sf *serverSessionFormat) stop() {
 	}
 }
 
-func (sf *serverSessionFormat) readRTPUDP(pkt *rtp.Packet, now time.Time) {
+func (sf *serverSessionFormat) readPacketRTPUDP(pkt *rtp.Packet, now time.Time) {
 	packets, lost := sf.udpReorderer.Process(pkt)
 	if lost != 0 {
-		sf.sm.ss.onPacketLost(liberrors.ErrServerRTPPacketsLost{Lost: lost})
+		sf.onPacketRTPLost(lost)
 		// do not return
 	}
 
 	for _, pkt := range packets {
-		err := sf.rtcpReceiver.ProcessPacket(pkt, now, sf.format.PTSEqualsDTS(pkt))
-		if err != nil {
-			sf.sm.ss.onDecodeError(err)
-			continue
-		}
-
-		sf.onPacketRTP(pkt)
+		sf.handlePacketRTP(pkt, now)
 	}
 }
 
-func (sf *serverSessionFormat) readRTPTCP(pkt *rtp.Packet) {
+func (sf *serverSessionFormat) readPacketRTPTCP(pkt *rtp.Packet) {
 	lost := sf.tcpLossDetector.Process(pkt)
 	if lost != 0 {
-		sf.sm.ss.onPacketLost(liberrors.ErrServerRTPPacketsLost{Lost: lost})
+		sf.onPacketRTPLost(lost)
 		// do not return
 	}
 
 	now := sf.sm.ss.s.timeNow()
 
-	err := sf.rtcpReceiver.ProcessPacket(pkt, now, sf.format.PTSEqualsDTS(pkt))
+	sf.handlePacketRTP(pkt, now)
+}
+
+func (sf *serverSessionFormat) handlePacketRTP(pkt *rtp.Packet, now time.Time) {
+	err := sf.rtcpReceiver.ProcessPacketRTP(pkt, now, sf.format.PTSEqualsDTS(pkt))
 	if err != nil {
-		sf.sm.ss.onDecodeError(err)
+		sf.sm.onPacketRTPDecodeError(err)
 		return
 	}
 
+	atomic.AddUint64(sf.rtpPacketsReceived, 1)
+
 	sf.onPacketRTP(pkt)
 }
+
+func (sf *serverSessionFormat) onPacketRTPLost(lost uint) {
+	atomic.AddUint64(sf.rtpPacketsLost, uint64(lost))
+
+	if h, ok := sf.sm.ss.s.Handler.(ServerHandlerOnPacketLost); ok {
+		h.OnPacketLost(&ServerHandlerOnPacketLostCtx{
+			Session: sf.sm.ss,
+			Error:   liberrors.ErrServerRTPPacketsLost{Lost: lost},
+		})
+	} else {
+		log.Println(liberrors.ErrServerRTPPacketsLost{Lost: lost}.Error())
+	}
+}
+
+func (sf *serverSessionFormat) writePacketRTPInQueueUDP(payload []byte) error {
+	err := sf.sm.ss.s.udpRTPListener.write(payload, sf.sm.udpRTPWriteAddr)
+	if err != nil {
+		return err
+	}
+
+	atomic.AddUint64(sf.sm.bytesSent, uint64(len(payload)))
+	atomic.AddUint64(sf.rtpPacketsSent, 1)
+	return nil
+}
+
+func (sf *serverSessionFormat) writePacketRTPInQueueTCP(payload []byte) error {
+	sf.sm.ss.tcpFrame.Channel = sf.sm.tcpChannel
+	sf.sm.ss.tcpFrame.Payload = payload
+	sf.sm.ss.tcpConn.nconn.SetWriteDeadline(time.Now().Add(sf.sm.ss.s.WriteTimeout))
+	err := sf.sm.ss.tcpConn.conn.WriteInterleavedFrame(sf.sm.ss.tcpFrame, sf.sm.ss.tcpBuffer)
+	if err != nil {
+		return err
+	}
+
+	atomic.AddUint64(sf.sm.bytesSent, uint64(len(payload)))
+	atomic.AddUint64(sf.rtpPacketsSent, 1)
+	return nil
+}

server_session_media.go

@@ -1,6 +1,7 @@
 package gortsplib
 
 import (
+	"log"
 	"net"
 	"sync/atomic"
 	"time"
@@ -23,20 +24,33 @@ type serverSessionMedia struct {
 	udpRTCPReadPort        int
 	udpRTCPWriteAddr       *net.UDPAddr
 	formats                map[uint8]*serverSessionFormat // record only
-	writePacketRTPInQueue  func([]byte) error
 	writePacketRTCPInQueue func([]byte) error
+	bytesReceived          *uint64
+	bytesSent              *uint64
+	rtpPacketsInError      *uint64
+	rtcpPacketsReceived    *uint64
+	rtcpPacketsSent        *uint64
+	rtcpPacketsInError     *uint64
 }
 
 func (sm *serverSessionMedia) initialize() {
-	if sm.ss.state == ServerSessionStatePreRecord {
-		sm.formats = make(map[uint8]*serverSessionFormat)
-		for _, forma := range sm.media.Formats {
-			sm.formats[forma.PayloadType()] = &serverSessionFormat{
-				sm:          sm,
-				format:      forma,
-				onPacketRTP: func(*rtp.Packet) {},
-			}
+	sm.bytesReceived = new(uint64)
+	sm.bytesSent = new(uint64)
+	sm.rtpPacketsInError = new(uint64)
+	sm.rtcpPacketsReceived = new(uint64)
+	sm.rtcpPacketsSent = new(uint64)
+	sm.rtcpPacketsInError = new(uint64)
+
+	sm.formats = make(map[uint8]*serverSessionFormat)
+
+	for _, forma := range sm.media.Formats {
+		f := &serverSessionFormat{
+			sm:          sm,
+			format:      forma,
+			onPacketRTP: func(*rtp.Packet) {},
 		}
+		f.initialize()
+		sm.formats[forma.PayloadType()] = f
 	}
 }
 
@@ -49,7 +63,6 @@ func (sm *serverSessionMedia) start() {
 
 	switch *sm.ss.setuppedTransport {
 	case TransportUDP, TransportUDPMulticast:
-		sm.writePacketRTPInQueue = sm.writePacketRTPInQueueUDP
 		sm.writePacketRTCPInQueue = sm.writePacketRTCPInQueueUDP
 
 		if *sm.ss.setuppedTransport == TransportUDP {
@@ -57,7 +70,7 @@ func (sm *serverSessionMedia) start() {
 				// firewall opening is performed with RTCP sender reports generated by ServerStream
 
 				// readers can send RTCP packets only
-				sm.ss.s.udpRTCPListener.addClient(sm.ss.author.ip(), sm.udpRTCPReadPort, sm.readRTCPUDPPlay)
+				sm.ss.s.udpRTCPListener.addClient(sm.ss.author.ip(), sm.udpRTCPReadPort, sm.readPacketRTCPUDPPlay)
 			} else {
 				// open the firewall by sending empty packets to the counterpart.
 				byts, _ := (&rtp.Packet{Header: rtp.Header{Version: 2}}).Marshal()
@@ -66,13 +79,12 @@ func (sm *serverSessionMedia) start() {
 				byts, _ = (&rtcp.ReceiverReport{}).Marshal()
 				sm.ss.s.udpRTCPListener.write(byts, sm.udpRTCPWriteAddr) //nolint:errcheck
 
-				sm.ss.s.udpRTPListener.addClient(sm.ss.author.ip(), sm.udpRTPReadPort, sm.readRTPUDPRecord)
-				sm.ss.s.udpRTCPListener.addClient(sm.ss.author.ip(), sm.udpRTCPReadPort, sm.readRTCPUDPRecord)
+				sm.ss.s.udpRTPListener.addClient(sm.ss.author.ip(), sm.udpRTPReadPort, sm.readPacketRTPUDPRecord)
+				sm.ss.s.udpRTCPListener.addClient(sm.ss.author.ip(), sm.udpRTCPReadPort, sm.readPacketRTCPUDPRecord)
 			}
 		}
 
 	case TransportTCP:
-		sm.writePacketRTPInQueue = sm.writePacketRTPInQueueTCP
 		sm.writePacketRTCPInQueue = sm.writePacketRTCPInQueueTCP
 
 		if sm.ss.tcpCallbackByChannel == nil {
@@ -80,11 +92,11 @@ func (sm *serverSessionMedia) start() {
 		}
 
 		if sm.ss.state == ServerSessionStatePlay {
-			sm.ss.tcpCallbackByChannel[sm.tcpChannel] = sm.readRTPTCPPlay
-			sm.ss.tcpCallbackByChannel[sm.tcpChannel+1] = sm.readRTCPTCPPlay
+			sm.ss.tcpCallbackByChannel[sm.tcpChannel] = sm.readPacketRTPTCPPlay
+			sm.ss.tcpCallbackByChannel[sm.tcpChannel+1] = sm.readPacketRTCPTCPPlay
 		} else {
-			sm.ss.tcpCallbackByChannel[sm.tcpChannel] = sm.readRTPTCPRecord
-			sm.ss.tcpCallbackByChannel[sm.tcpChannel+1] = sm.readRTCPTCPRecord
+			sm.ss.tcpCallbackByChannel[sm.tcpChannel] = sm.readPacketRTPTCPRecord
+			sm.ss.tcpCallbackByChannel[sm.tcpChannel+1] = sm.readPacketRTCPTCPRecord
 		}
 	}
 }
@@ -102,59 +114,58 @@ func (sm *serverSessionMedia) stop() {
 
 func (sm *serverSessionMedia) findFormatWithSSRC(ssrc uint32) *serverSessionFormat {
 	for _, format := range sm.formats {
-		tssrc, ok := format.rtcpReceiver.SenderSSRC()
-		if ok && tssrc == ssrc {
+		stats := format.rtcpReceiver.Stats()
+		if stats != nil && stats.RemoteSSRC == ssrc {
 			return format
 		}
 	}
 	return nil
 }
 
-func (sm *serverSessionMedia) writePacketRTPInQueueUDP(payload []byte) error {
-	atomic.AddUint64(sm.ss.bytesSent, uint64(len(payload)))
-	return sm.ss.s.udpRTPListener.write(payload, sm.udpRTPWriteAddr)
-}
-
 func (sm *serverSessionMedia) writePacketRTCPInQueueUDP(payload []byte) error {
-	atomic.AddUint64(sm.ss.bytesSent, uint64(len(payload)))
-	return sm.ss.s.udpRTCPListener.write(payload, sm.udpRTCPWriteAddr)
-}
+	err := sm.ss.s.udpRTCPListener.write(payload, sm.udpRTCPWriteAddr)
+	if err != nil {
+		return err
+	}
 
-func (sm *serverSessionMedia) writePacketRTPInQueueTCP(payload []byte) error {
-	atomic.AddUint64(sm.ss.bytesSent, uint64(len(payload)))
-	sm.ss.tcpFrame.Channel = sm.tcpChannel
-	sm.ss.tcpFrame.Payload = payload
-	sm.ss.tcpConn.nconn.SetWriteDeadline(time.Now().Add(sm.ss.s.WriteTimeout))
-	return sm.ss.tcpConn.conn.WriteInterleavedFrame(sm.ss.tcpFrame, sm.ss.tcpBuffer)
+	atomic.AddUint64(sm.bytesSent, uint64(len(payload)))
+	atomic.AddUint64(sm.rtcpPacketsSent, 1)
+	return nil
 }
 
 func (sm *serverSessionMedia) writePacketRTCPInQueueTCP(payload []byte) error {
-	atomic.AddUint64(sm.ss.bytesSent, uint64(len(payload)))
 	sm.ss.tcpFrame.Channel = sm.tcpChannel + 1
 	sm.ss.tcpFrame.Payload = payload
 	sm.ss.tcpConn.nconn.SetWriteDeadline(time.Now().Add(sm.ss.s.WriteTimeout))
-	return sm.ss.tcpConn.conn.WriteInterleavedFrame(sm.ss.tcpFrame, sm.ss.tcpBuffer)
+	err := sm.ss.tcpConn.conn.WriteInterleavedFrame(sm.ss.tcpFrame, sm.ss.tcpBuffer)
+	if err != nil {
+		return err
+	}
+
+	atomic.AddUint64(sm.bytesSent, uint64(len(payload)))
+	atomic.AddUint64(sm.rtcpPacketsSent, 1)
+	return nil
 }
 
-func (sm *serverSessionMedia) readRTCPUDPPlay(payload []byte) bool {
-	plen := len(payload)
+func (sm *serverSessionMedia) readPacketRTCPUDPPlay(payload []byte) bool {
+	atomic.AddUint64(sm.bytesReceived, uint64(len(payload)))
 
-	atomic.AddUint64(sm.ss.bytesReceived, uint64(plen))
-
-	if plen == (udpMaxPayloadSize + 1) {
-		sm.ss.onDecodeError(liberrors.ErrServerRTCPPacketTooBigUDP{})
+	if len(payload) == (udpMaxPayloadSize + 1) {
+		sm.onPacketRTCPDecodeError(liberrors.ErrServerRTCPPacketTooBigUDP{})
 		return false
 	}
 
 	packets, err := rtcp.Unmarshal(payload)
 	if err != nil {
-		sm.ss.onDecodeError(err)
+		sm.onPacketRTCPDecodeError(err)
 		return false
 	}
 
 	now := sm.ss.s.timeNow()
 	atomic.StoreInt64(sm.ss.udpLastPacketTime, now.Unix())
 
+	atomic.AddUint64(sm.rtcpPacketsReceived, uint64(len(packets)))
+
 	for _, pkt := range packets {
 		sm.onPacketRTCP(pkt)
 	}
@@ -162,56 +173,54 @@ func (sm *serverSessionMedia) readRTCPUDPPlay(payload []byte) bool {
 	return true
 }
 
-func (sm *serverSessionMedia) readRTPUDPRecord(payload []byte) bool {
-	plen := len(payload)
+func (sm *serverSessionMedia) readPacketRTPUDPRecord(payload []byte) bool {
+	atomic.AddUint64(sm.bytesReceived, uint64(len(payload)))
 
-	atomic.AddUint64(sm.ss.bytesReceived, uint64(plen))
-
-	if plen == (udpMaxPayloadSize + 1) {
-		sm.ss.onDecodeError(liberrors.ErrServerRTPPacketTooBigUDP{})
+	if len(payload) == (udpMaxPayloadSize + 1) {
+		sm.onPacketRTPDecodeError(liberrors.ErrServerRTPPacketTooBigUDP{})
 		return false
 	}
 
 	pkt := &rtp.Packet{}
 	err := pkt.Unmarshal(payload)
 	if err != nil {
-		sm.ss.onDecodeError(err)
+		sm.onPacketRTPDecodeError(err)
 		return false
 	}
 
 	forma, ok := sm.formats[pkt.PayloadType]
 	if !ok {
-		sm.ss.onDecodeError(liberrors.ErrServerRTPPacketUnknownPayloadType{PayloadType: pkt.PayloadType})
+		sm.onPacketRTPDecodeError(liberrors.ErrServerRTPPacketUnknownPayloadType{PayloadType: pkt.PayloadType})
 		return false
 	}
 
 	now := sm.ss.s.timeNow()
 	atomic.StoreInt64(sm.ss.udpLastPacketTime, now.Unix())
 
-	forma.readRTPUDP(pkt, now)
+	forma.readPacketRTPUDP(pkt, now)
 
 	return true
 }
 
-func (sm *serverSessionMedia) readRTCPUDPRecord(payload []byte) bool {
-	plen := len(payload)
+func (sm *serverSessionMedia) readPacketRTCPUDPRecord(payload []byte) bool {
+	atomic.AddUint64(sm.bytesReceived, uint64(len(payload)))
 
-	atomic.AddUint64(sm.ss.bytesReceived, uint64(plen))
-
-	if plen == (udpMaxPayloadSize + 1) {
-		sm.ss.onDecodeError(liberrors.ErrServerRTCPPacketTooBigUDP{})
+	if len(payload) == (udpMaxPayloadSize + 1) {
+		sm.onPacketRTCPDecodeError(liberrors.ErrServerRTCPPacketTooBigUDP{})
 		return false
 	}
 
 	packets, err := rtcp.Unmarshal(payload)
 	if err != nil {
-		sm.ss.onDecodeError(err)
+		sm.onPacketRTCPDecodeError(err)
 		return false
 	}
 
 	now := sm.ss.s.timeNow()
 	atomic.StoreInt64(sm.ss.udpLastPacketTime, now.Unix())
 
+	atomic.AddUint64(sm.rtcpPacketsReceived, uint64(len(packets)))
+
 	for _, pkt := range packets {
 		if sr, ok := pkt.(*rtcp.SenderReport); ok {
 			format := sm.findFormatWithSSRC(sr.SSRC)
@@ -226,22 +235,26 @@ func (sm *serverSessionMedia) readRTCPUDPRecord(payload []byte) bool {
 	return true
 }
 
-func (sm *serverSessionMedia) readRTPTCPPlay(_ []byte) bool {
+func (sm *serverSessionMedia) readPacketRTPTCPPlay(_ []byte) bool {
 	return false
 }
 
-func (sm *serverSessionMedia) readRTCPTCPPlay(payload []byte) bool {
+func (sm *serverSessionMedia) readPacketRTCPTCPPlay(payload []byte) bool {
+	atomic.AddUint64(sm.bytesReceived, uint64(len(payload)))
+
 	if len(payload) > udpMaxPayloadSize {
-		sm.ss.onDecodeError(liberrors.ErrServerRTCPPacketTooBig{L: len(payload), Max: udpMaxPayloadSize})
+		sm.onPacketRTCPDecodeError(liberrors.ErrServerRTCPPacketTooBig{L: len(payload), Max: udpMaxPayloadSize})
 		return false
 	}
 
 	packets, err := rtcp.Unmarshal(payload)
 	if err != nil {
-		sm.ss.onDecodeError(err)
+		sm.onPacketRTCPDecodeError(err)
 		return false
 	}
 
+	atomic.AddUint64(sm.rtcpPacketsReceived, uint64(len(packets)))
+
 	for _, pkt := range packets {
 		sm.onPacketRTCP(pkt)
 	}
@@ -249,39 +262,45 @@ func (sm *serverSessionMedia) readRTCPTCPPlay(payload []byte) bool {
 	return true
 }
 
-func (sm *serverSessionMedia) readRTPTCPRecord(payload []byte) bool {
+func (sm *serverSessionMedia) readPacketRTPTCPRecord(payload []byte) bool {
+	atomic.AddUint64(sm.bytesReceived, uint64(len(payload)))
+
 	pkt := &rtp.Packet{}
 	err := pkt.Unmarshal(payload)
 	if err != nil {
-		sm.ss.onDecodeError(err)
+		sm.onPacketRTPDecodeError(err)
 		return false
 	}
 
 	forma, ok := sm.formats[pkt.PayloadType]
 	if !ok {
-		sm.ss.onDecodeError(liberrors.ErrServerRTPPacketUnknownPayloadType{PayloadType: pkt.PayloadType})
+		sm.onPacketRTPDecodeError(liberrors.ErrServerRTPPacketUnknownPayloadType{PayloadType: pkt.PayloadType})
 		return false
 	}
 
-	forma.readRTPTCP(pkt)
+	forma.readPacketRTPTCP(pkt)
 
 	return true
 }
 
-func (sm *serverSessionMedia) readRTCPTCPRecord(payload []byte) bool {
+func (sm *serverSessionMedia) readPacketRTCPTCPRecord(payload []byte) bool {
+	atomic.AddUint64(sm.bytesReceived, uint64(len(payload)))
+
 	if len(payload) > udpMaxPayloadSize {
-		sm.ss.onDecodeError(liberrors.ErrServerRTCPPacketTooBig{L: len(payload), Max: udpMaxPayloadSize})
+		sm.onPacketRTCPDecodeError(liberrors.ErrServerRTCPPacketTooBig{L: len(payload), Max: udpMaxPayloadSize})
 		return false
 	}
 
 	packets, err := rtcp.Unmarshal(payload)
 	if err != nil {
-		sm.ss.onDecodeError(err)
+		sm.onPacketRTCPDecodeError(err)
 		return false
 	}
 
 	now := sm.ss.s.timeNow()
 
+	atomic.AddUint64(sm.rtcpPacketsReceived, uint64(len(packets)))
+
 	for _, pkt := range packets {
 		if sr, ok := pkt.(*rtcp.SenderReport); ok {
 			format := sm.findFormatWithSSRC(sr.SSRC)
@@ -295,3 +314,29 @@ func (sm *serverSessionMedia) readRTCPTCPRecord(payload []byte) bool {
 
 	return true
 }
+
+func (sm *serverSessionMedia) onPacketRTPDecodeError(err error) {
+	atomic.AddUint64(sm.rtpPacketsInError, 1)
+
+	if h, ok := sm.ss.s.Handler.(ServerHandlerOnDecodeError); ok {
+		h.OnDecodeError(&ServerHandlerOnDecodeErrorCtx{
+			Session: sm.ss,
+			Error:   err,
+		})
+	} else {
+		log.Println(err.Error())
+	}
+}
+
+func (sm *serverSessionMedia) onPacketRTCPDecodeError(err error) {
+	atomic.AddUint64(sm.rtcpPacketsInError, 1)
+
+	if h, ok := sm.ss.s.Handler.(ServerHandlerOnDecodeError); ok {
+		h.OnDecodeError(&ServerHandlerOnDecodeErrorCtx{
+			Session: sm.ss,
+			Error:   err,
+		})
+	} else {
+		log.Println(err.Error())
+	}
+}

server_stream.go

@@ -9,6 +9,7 @@ import (
 	"github.com/pion/rtp"
 
 	"github.com/bluenviron/gortsplib/v4/pkg/description"
+	"github.com/bluenviron/gortsplib/v4/pkg/format"
 	"github.com/bluenviron/gortsplib/v4/pkg/headers"
 	"github.com/bluenviron/gortsplib/v4/pkg/liberrors"
 )
@@ -36,9 +37,8 @@ type ServerStream struct {
 	readers              map[*ServerSession]struct{}
 	multicastReaderCount int
 	activeUnicastReaders map[*ServerSession]struct{}
-	streamMedias         map[*description.Media]*serverStreamMedia
+	medias               map[*description.Media]*serverStreamMedia
 	closed               bool
-	bytesSent            *uint64
 }
 
 // NewServerStream allocates a ServerStream.
@@ -48,10 +48,9 @@ func NewServerStream(s *Server, desc *description.Session) *ServerStream {
 		desc:                 desc,
 		readers:              make(map[*ServerSession]struct{}),
 		activeUnicastReaders: make(map[*ServerSession]struct{}),
-		bytesSent:            new(uint64),
 	}
 
-	st.streamMedias = make(map[*description.Media]*serverStreamMedia, len(desc.Medias))
+	st.medias = make(map[*description.Media]*serverStreamMedia, len(desc.Medias))
 	for i, medi := range desc.Medias {
 		sm := &serverStreamMedia{
 			st:      st,
@@ -59,7 +58,7 @@ func NewServerStream(s *Server, desc *description.Session) *ServerStream {
 			trackID: i,
 		}
 		sm.initialize()
-		st.streamMedias[medi] = sm
+		st.medias[medi] = sm
 	}
 
 	return st
@@ -75,14 +74,20 @@ func (st *ServerStream) Close() {
 		ss.Close()
 	}
 
-	for _, sm := range st.streamMedias {
+	for _, sm := range st.medias {
 		sm.close()
 	}
 }
 
 // BytesSent returns the number of written bytes.
+//
+// Deprecated: replaced by Stats()
 func (st *ServerStream) BytesSent() uint64 {
-	return atomic.LoadUint64(st.bytesSent)
+	v := uint64(0)
+	for _, me := range st.medias {
+		v += atomic.LoadUint64(me.bytesSent)
+	}
+	return v
 }
 
 // Description returns the description of the stream.
@@ -90,27 +95,84 @@ func (st *ServerStream) Description() *description.Session {
 	return st.desc
 }
 
-func (st *ServerStream) senderSSRC(medi *description.Media) (uint32, bool) {
+// Stats returns stream statistics.
+func (st *ServerStream) Stats() *ServerStreamStats {
+	return &ServerStreamStats{
+		BytesSent: func() uint64 {
+			v := uint64(0)
+			for _, me := range st.medias {
+				v += atomic.LoadUint64(me.bytesSent)
+			}
+			return v
+		}(),
+		RTPPacketsSent: func() uint64 {
+			v := uint64(0)
+			for _, me := range st.medias {
+				for _, f := range me.formats {
+					v += atomic.LoadUint64(f.rtpPacketsSent)
+				}
+			}
+			return v
+		}(),
+		RTCPPacketsSent: func() uint64 {
+			v := uint64(0)
+			for _, me := range st.medias {
+				v += atomic.LoadUint64(me.rtcpPacketsSent)
+			}
+			return v
+		}(),
+		Medias: func() map[*description.Media]ServerStreamStatsMedia {
+			ret := make(map[*description.Media]ServerStreamStatsMedia, len(st.medias))
+
+			for med, sm := range st.medias {
+				ret[med] = ServerStreamStatsMedia{
+					BytesSent:       atomic.LoadUint64(sm.bytesSent),
+					RTCPPacketsSent: atomic.LoadUint64(sm.rtcpPacketsSent),
+					Formats: func() map[format.Format]ServerStreamStatsFormat {
+						ret := make(map[format.Format]ServerStreamStatsFormat)
+
+						for _, fo := range sm.formats {
+							ret[fo.format] = ServerStreamStatsFormat{
+								RTPPacketsSent: atomic.LoadUint64(fo.rtpPacketsSent),
+							}
+						}
+
+						return ret
+					}(),
+				}
+			}
+
+			return ret
+		}(),
+	}
+}
+
+func (st *ServerStream) localSSRC(medi *description.Media) (uint32, bool) {
 	st.mutex.Lock()
 	defer st.mutex.Unlock()
 
-	sm := st.streamMedias[medi]
+	sm := st.medias[medi]
 
-	// senderSSRC() is used to fill SSRC inside the Transport header.
+	// localSSRC() is used to fill SSRC inside the Transport header.
 	// if there are multiple formats inside a single media stream,
 	// do not return anything, since Transport headers don't support multiple SSRCs.
 	if len(sm.formats) > 1 {
 		return 0, false
 	}
 
-	return firstFormat(sm.formats).rtcpSender.SenderSSRC()
+	stats := firstFormat(sm.formats).rtcpSender.Stats()
+	if stats == nil {
+		return 0, false
+	}
+
+	return stats.LocalSSRC, true
 }
 
 func (st *ServerStream) rtpInfoEntry(medi *description.Media, now time.Time) *headers.RTPInfoEntry {
 	st.mutex.Lock()
 	defer st.mutex.Unlock()
 
-	sm := st.streamMedias[medi]
+	sm := st.medias[medi]
 
 	// if there are multiple formats inside a single media stream,
 	// do not generate a RTP-Info entry, since RTP-Info doesn't support
@@ -121,8 +183,8 @@ func (st *ServerStream) rtpInfoEntry(medi *description.Media, now time.Time) *he
 
 	format := firstFormat(sm.formats)
 
-	lastSeqNum, lastTimeRTP, lastTimeNTP, ok := format.rtcpSender.LastPacketData()
-	if !ok {
+	stats := format.rtcpSender.Stats()
+	if stats == nil {
 		return nil
 	}
 
@@ -132,13 +194,13 @@ func (st *ServerStream) rtpInfoEntry(medi *description.Media, now time.Time) *he
 	}
 
 	// sequence number of the first packet of the stream
-	seqNum := lastSeqNum + 1
+	seqNum := stats.LastSequenceNumber + 1
 
 	// RTP timestamp corresponding to the time value in
 	// the Range response header.
 	// remove a small quantity in order to avoid DTS > PTS
-	ts := uint32(uint64(lastTimeRTP) +
-		uint64(now.Sub(lastTimeNTP).Seconds()*float64(clockRate)) -
+	ts := uint32(uint64(stats.LastRTP) +
+		uint64(now.Sub(stats.LastNTP).Seconds()*float64(clockRate)) -
 		uint64(clockRate)/10)
 
 	return &headers.RTPInfoEntry{
@@ -175,7 +237,7 @@ func (st *ServerStream) readerAdd(
 
 	case TransportUDPMulticast:
 		if st.multicastReaderCount == 0 {
-			for _, media := range st.streamMedias {
+			for _, media := range st.medias {
 				mw := &serverMulticastWriter{
 					s: st.s,
 				}
@@ -207,7 +269,7 @@ func (st *ServerStream) readerRemove(ss *ServerSession) {
 	if *ss.setuppedTransport == TransportUDPMulticast {
 		st.multicastReaderCount--
 		if st.multicastReaderCount == 0 {
-			for _, media := range st.streamMedias {
+			for _, media := range st.medias {
 				media.multicastWriter.close()
 				media.multicastWriter = nil
 			}
@@ -225,9 +287,9 @@ func (st *ServerStream) readerSetActive(ss *ServerSession) {
 
 	if *ss.setuppedTransport == TransportUDPMulticast {
 		for medi, sm := range ss.setuppedMedias {
-			streamMedia := st.streamMedias[medi]
+			streamMedia := st.medias[medi]
 			streamMedia.multicastWriter.rtcpl.addClient(
-				ss.author.ip(), streamMedia.multicastWriter.rtcpl.port(), sm.readRTCPUDPPlay)
+				ss.author.ip(), streamMedia.multicastWriter.rtcpl.port(), sm.readPacketRTCPUDPPlay)
 		}
 	} else {
 		st.activeUnicastReaders[ss] = struct{}{}
@@ -244,7 +306,7 @@ func (st *ServerStream) readerSetInactive(ss *ServerSession) {
 
 	if *ss.setuppedTransport == TransportUDPMulticast {
 		for medi := range ss.setuppedMedias {
-			streamMedia := st.streamMedias[medi]
+			streamMedia := st.medias[medi]
 			streamMedia.multicastWriter.rtcpl.removeClient(ss.author.ip(), streamMedia.multicastWriter.rtcpl.port())
 		}
 	} else {
@@ -274,7 +336,7 @@ func (st *ServerStream) WritePacketRTPWithNTP(medi *description.Media, pkt *rtp.
 		return liberrors.ErrServerStreamClosed{}
 	}
 
-	sm := st.streamMedias[medi]
+	sm := st.medias[medi]
 	sf := sm.formats[pkt.PayloadType]
 	return sf.writePacketRTP(byts, pkt, ntp)
 }
@@ -293,6 +355,6 @@ func (st *ServerStream) WritePacketRTCP(medi *description.Media, pkt rtcp.Packet
 		return liberrors.ErrServerStreamClosed{}
 	}
 
-	sm := st.streamMedias[medi]
+	sm := st.medias[medi]
 	return sm.writePacketRTCP(byts)
 }

server_stream_format.go

@@ -15,10 +15,13 @@ type serverStreamFormat struct {
 	sm     *serverStreamMedia
 	format format.Format
 
-	rtcpSender *rtcpsender.RTCPSender
+	rtcpSender     *rtcpsender.RTCPSender
+	rtpPacketsSent *uint64
 }
 
 func (sf *serverStreamFormat) initialize() {
+	sf.rtpPacketsSent = new(uint64)
+
 	sf.rtcpSender = &rtcpsender.RTCPSender{
 		ClockRate: sf.format.ClockRate(),
 		Period:    sf.sm.st.s.senderReportPeriod,
@@ -33,19 +36,21 @@ func (sf *serverStreamFormat) initialize() {
 }
 
 func (sf *serverStreamFormat) writePacketRTP(byts []byte, pkt *rtp.Packet, ntp time.Time) error {
-	sf.rtcpSender.ProcessPacket(pkt, ntp, sf.format.PTSEqualsDTS(pkt))
+	sf.rtcpSender.ProcessPacketRTP(pkt, ntp, sf.format.PTSEqualsDTS(pkt))
 
 	le := uint64(len(byts))
 
 	// send unicast
 	for r := range sf.sm.st.activeUnicastReaders {
 		if _, ok := r.setuppedMedias[sf.sm.media]; ok {
-			err := r.writePacketRTP(sf.sm.media, byts)
+			err := r.writePacketRTP(sf.sm.media, pkt.PayloadType, byts)
 			if err != nil {
 				r.onStreamWriteError(err)
-			} else {
-				atomic.AddUint64(sf.sm.st.bytesSent, le)
+				continue
 			}
+
+			atomic.AddUint64(sf.sm.bytesSent, le)
+			atomic.AddUint64(sf.rtpPacketsSent, 1)
 		}
 	}
 
@@ -55,7 +60,9 @@ func (sf *serverStreamFormat) writePacketRTP(byts []byte, pkt *rtp.Packet, ntp t
 		if err != nil {
 			return err
 		}
-		atomic.AddUint64(sf.sm.st.bytesSent, le)
+
+		atomic.AddUint64(sf.sm.bytesSent, le)
+		atomic.AddUint64(sf.rtpPacketsSent, 1)
 	}
 
 	return nil

server_stream_media.go

@@ -1,6 +1,8 @@
 package gortsplib
 
 import (
+	"sync/atomic"
+
 	"github.com/bluenviron/gortsplib/v4/pkg/description"
 )
 
@@ -11,9 +13,14 @@ type serverStreamMedia struct {
 
 	formats         map[uint8]*serverStreamFormat
 	multicastWriter *serverMulticastWriter
+	bytesSent       *uint64
+	rtcpPacketsSent *uint64
 }
 
 func (sm *serverStreamMedia) initialize() {
+	sm.bytesSent = new(uint64)
+	sm.rtcpPacketsSent = new(uint64)
+
 	sm.formats = make(map[uint8]*serverStreamFormat)
 	for _, forma := range sm.media.Formats {
 		sf := &serverStreamFormat{
@@ -38,13 +45,19 @@ func (sm *serverStreamMedia) close() {
 }
 
 func (sm *serverStreamMedia) writePacketRTCP(byts []byte) error {
+	le := len(byts)
+
 	// send unicast
 	for r := range sm.st.activeUnicastReaders {
 		if _, ok := r.setuppedMedias[sm.media]; ok {
 			err := r.writePacketRTCP(sm.media, byts)
 			if err != nil {
 				r.onStreamWriteError(err)
+				continue
 			}
+
+			atomic.AddUint64(sm.bytesSent, uint64(le))
+			atomic.AddUint64(sm.rtcpPacketsSent, 1)
 		}
 	}
 
@@ -54,6 +67,9 @@ func (sm *serverStreamMedia) writePacketRTCP(byts []byte) error {
 		if err != nil {
 			return err
 		}
+
+		atomic.AddUint64(sm.bytesSent, uint64(le))
+		atomic.AddUint64(sm.rtcpPacketsSent, 1)
 	}
 
 	return nil

server_stream_stats.go

@@ -0,0 +1,36 @@
+package gortsplib
+
+import (
+	"github.com/bluenviron/gortsplib/v4/pkg/description"
+	"github.com/bluenviron/gortsplib/v4/pkg/format"
+)
+
+// ServerStreamStatsFormat are stream format statistics.
+type ServerStreamStatsFormat struct {
+	// number of sent RTP packets
+	RTPPacketsSent uint64
+}
+
+// ServerStreamStatsMedia are stream media statistics.
+type ServerStreamStatsMedia struct {
+	// sent bytes
+	BytesSent uint64
+	// number of sent RTCP packets
+	RTCPPacketsSent uint64
+
+	// format statistics
+	Formats map[format.Format]ServerStreamStatsFormat
+}
+
+// ServerStreamStats are stream statistics.
+type ServerStreamStats struct {
+	// sent bytes
+	BytesSent uint64
+	// number of sent RTP packets
+	RTPPacketsSent uint64
+	// number of sent RTCP packets
+	RTCPPacketsSent uint64
+
+	// media statistics
+	Medias map[*description.Media]ServerStreamStatsMedia
+}

stats_conn.go

@@ -0,0 +1,9 @@
+package gortsplib
+
+// StatsConn are connection statistics.
+type StatsConn struct {
+	// received bytes
+	BytesReceived uint64
+	// sent bytes
+	BytesSent uint64
+}

stats_session.go

@@ -0,0 +1,76 @@
+package gortsplib
+
+import (
+	"time"
+
+	"github.com/bluenviron/gortsplib/v4/pkg/description"
+	"github.com/bluenviron/gortsplib/v4/pkg/format"
+)
+
+// StatsSessionFormat are session format statistics.
+type StatsSessionFormat struct {
+	// number of RTP packets correctly received and processed
+	RTPPacketsReceived uint64
+	// number of sent RTP packets
+	RTPPacketsSent uint64
+	// number of lost RTP packets
+	RTPPacketsLost uint64
+	// mean jitter of received RTP packets
+	RTPJitter float64
+	// local SSRC
+	LocalSSRC uint32
+	// remote SSRC
+	RemoteSSRC uint32
+	// last sequence number of incoming/outgoing RTP packets
+	RTPPacketsLastSequenceNumber uint16
+	// last RTP time of incoming/outgoing RTP packets
+	RTPPacketsLastRTP uint32
+	// last NTP time of incoming/outgoing NTP packets
+	RTPPacketsLastNTP time.Time
+}
+
+// StatsSessionMedia are session media statistics.
+type StatsSessionMedia struct {
+	// received bytes
+	BytesReceived uint64
+	// sent bytes
+	BytesSent uint64
+	// number of RTP packets that could not be processed
+	RTPPacketsInError uint64
+	// number of RTCP packets correctly received and processed
+	RTCPPacketsReceived uint64
+	// number of sent RTCP packets
+	RTCPPacketsSent uint64
+	// number of RTCP packets that could not be processed
+	RTCPPacketsInError uint64
+
+	// format statistics
+	Formats map[format.Format]StatsSessionFormat
+}
+
+// StatsSession are session statistics.
+type StatsSession struct {
+	// received bytes
+	BytesReceived uint64
+	// sent bytes
+	BytesSent uint64
+	// number of RTP packets correctly received and processed
+	RTPPacketsReceived uint64
+	// number of sent RTP packets
+	RTPPacketsSent uint64
+	// number of lost RTP packets
+	RTPPacketsLost uint64
+	// number of RTP packets that could not be processed
+	RTPPacketsInError uint64
+	// mean jitter of received RTP packets
+	RTPJitter float64
+	// number of RTCP packets correctly received and processed
+	RTCPPacketsReceived uint64
+	// number of sent RTCP packets
+	RTCPPacketsSent uint64
+	// number of RTCP packets that could not be processed
+	RTCPPacketsInError uint64
+
+	// media statistics
+	Medias map[*description.Media]StatsSessionMedia
+}