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stats_recorder.go
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/
stats_recorder.go
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// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
// SPDX-License-Identifier: MIT
package stats
import (
"sync"
"sync/atomic"
"time"
"github.com/pion/interceptor"
"github.com/pion/interceptor/internal/ntp"
"github.com/pion/interceptor/internal/sequencenumber"
"github.com/pion/logging"
"github.com/pion/rtcp"
"github.com/pion/rtp"
)
// Stats contains all the available statistics of RTP streams
type Stats struct {
InboundRTPStreamStats
OutboundRTPStreamStats
RemoteInboundRTPStreamStats
RemoteOutboundRTPStreamStats
}
type internalStats struct {
inboundSequencerNumber sequencenumber.Unwrapper
inboundSequenceNumberInitialized bool
inboundFirstSequenceNumber int64
inboundHighestSequenceNumber int64
inboundLastArrivalInitialized bool
inboundLastArrival time.Time
inboundLastTransit int
remoteInboundFirstSequenceNumberInitialized bool
remoteInboundFirstSequenceNumber int64
lastSenderReports []uint64
lastReceiverReferenceTimes []uint64
InboundRTPStreamStats
OutboundRTPStreamStats
RemoteInboundRTPStreamStats
RemoteOutboundRTPStreamStats
}
type incomingRTP struct {
ts time.Time
header rtp.Header
payloadLen int
attr interceptor.Attributes
}
type incomingRTCP struct {
ts time.Time
pkts []rtcp.Packet
attr interceptor.Attributes
}
type outgoingRTP struct {
ts time.Time
header rtp.Header
payloadLen int
attr interceptor.Attributes
}
type outgoingRTCP struct {
ts time.Time
pkts []rtcp.Packet
attr interceptor.Attributes
}
type recorder struct {
logger logging.LeveledLogger
ssrc uint32
clockRate float64
maxLastSenderReports int
maxLastReceiverReferenceTimes int
latestStats *internalStats
ms *sync.Mutex // Locks latestStats
running uint32
}
func newRecorder(ssrc uint32, clockRate float64) *recorder {
return &recorder{
logger: logging.NewDefaultLoggerFactory().NewLogger("stats_recorder"),
ssrc: ssrc,
clockRate: clockRate,
maxLastSenderReports: 5,
maxLastReceiverReferenceTimes: 5,
latestStats: &internalStats{},
ms: &sync.Mutex{},
}
}
func (r *recorder) Stop() {
atomic.StoreUint32(&r.running, 0)
}
func (r *recorder) GetStats() Stats {
r.ms.Lock()
defer r.ms.Unlock()
return Stats{
InboundRTPStreamStats: r.latestStats.InboundRTPStreamStats,
OutboundRTPStreamStats: r.latestStats.OutboundRTPStreamStats,
RemoteInboundRTPStreamStats: r.latestStats.RemoteInboundRTPStreamStats,
RemoteOutboundRTPStreamStats: r.latestStats.RemoteOutboundRTPStreamStats,
}
}
func (r *recorder) recordIncomingRTP(latestStats internalStats, v *incomingRTP) internalStats {
if v.header.SSRC != r.ssrc {
return latestStats
}
sequenceNumber := latestStats.inboundSequencerNumber.Unwrap(v.header.SequenceNumber)
if !latestStats.inboundSequenceNumberInitialized {
latestStats.inboundFirstSequenceNumber = sequenceNumber
latestStats.inboundSequenceNumberInitialized = true
}
if sequenceNumber > latestStats.inboundHighestSequenceNumber {
latestStats.inboundHighestSequenceNumber = sequenceNumber
}
latestStats.InboundRTPStreamStats.PacketsReceived++
expectedPackets := latestStats.inboundHighestSequenceNumber - latestStats.inboundFirstSequenceNumber + 1
latestStats.InboundRTPStreamStats.PacketsLost = expectedPackets - int64(latestStats.InboundRTPStreamStats.PacketsReceived)
if !latestStats.inboundLastArrivalInitialized {
latestStats.inboundLastArrival = v.ts
latestStats.inboundLastArrivalInitialized = true
} else {
arrival := int(v.ts.Sub(latestStats.inboundLastArrival).Seconds() * r.clockRate)
transit := arrival - int(v.header.Timestamp)
d := transit - latestStats.inboundLastTransit
latestStats.inboundLastTransit = transit
if d < 0 {
d = -d
}
latestStats.InboundRTPStreamStats.Jitter += (1.0 / 16.0) * (float64(d) - latestStats.InboundRTPStreamStats.Jitter)
latestStats.inboundLastArrival = v.ts
}
latestStats.LastPacketReceivedTimestamp = v.ts
latestStats.HeaderBytesReceived += uint64(v.header.MarshalSize())
latestStats.BytesReceived += uint64(v.header.MarshalSize() + v.payloadLen)
return latestStats
}
func (r *recorder) recordOutgoingRTCP(latestStats internalStats, v *outgoingRTCP) internalStats {
for _, pkt := range v.pkts {
// The SSRC check is performed for most of the cases but not all. The
// reason is that ReceiverReferenceTimeReportBlocks don't have
// destination SSRCs but must still be recorded.
switch rtcpPkt := pkt.(type) {
case *rtcp.FullIntraRequest:
if !contains(pkt.DestinationSSRC(), r.ssrc) {
r.logger.Debugf("skipping outgoing RTCP pkt: %v\n", pkt)
continue
}
latestStats.InboundRTPStreamStats.FIRCount++
case *rtcp.PictureLossIndication:
if !contains(pkt.DestinationSSRC(), r.ssrc) {
r.logger.Debugf("skipping outgoing RTCP pkt: %v\n", pkt)
continue
}
latestStats.InboundRTPStreamStats.PLICount++
case *rtcp.TransportLayerNack:
if !contains(pkt.DestinationSSRC(), r.ssrc) {
r.logger.Debugf("skipping outgoing RTCP pkt: %v\n", pkt)
continue
}
latestStats.InboundRTPStreamStats.NACKCount++
case *rtcp.SenderReport:
if !contains(pkt.DestinationSSRC(), r.ssrc) {
r.logger.Debugf("skipping outgoing RTCP pkt: %v\n", pkt)
continue
}
latestStats.lastSenderReports = append(latestStats.lastSenderReports, rtcpPkt.NTPTime)
if len(latestStats.lastSenderReports) > r.maxLastSenderReports {
latestStats.lastSenderReports = latestStats.lastSenderReports[len(latestStats.lastSenderReports)-r.maxLastSenderReports:]
}
case *rtcp.ExtendedReport:
for _, block := range rtcpPkt.Reports {
if xr, ok := block.(*rtcp.ReceiverReferenceTimeReportBlock); ok {
latestStats.lastReceiverReferenceTimes = append(latestStats.lastReceiverReferenceTimes, xr.NTPTimestamp)
if len(latestStats.lastReceiverReferenceTimes) > r.maxLastReceiverReferenceTimes {
latestStats.lastReceiverReferenceTimes = latestStats.lastReceiverReferenceTimes[len(latestStats.lastReceiverReferenceTimes)-r.maxLastReceiverReferenceTimes:]
}
}
}
}
}
return latestStats
}
func (r *recorder) recordOutgoingRTP(latestStats internalStats, v *outgoingRTP) internalStats {
if v.header.SSRC != r.ssrc {
return latestStats
}
headerSize := v.header.MarshalSize()
latestStats.OutboundRTPStreamStats.PacketsSent++
latestStats.OutboundRTPStreamStats.BytesSent += uint64(headerSize + v.payloadLen)
latestStats.HeaderBytesSent += uint64(headerSize)
if !latestStats.remoteInboundFirstSequenceNumberInitialized {
latestStats.remoteInboundFirstSequenceNumber = int64(v.header.SequenceNumber)
latestStats.remoteInboundFirstSequenceNumberInitialized = true
}
return latestStats
}
func (r *recorder) recordIncomingRR(latestStats internalStats, pkt *rtcp.ReceiverReport, ts time.Time) internalStats {
for _, report := range pkt.Reports {
if latestStats.remoteInboundFirstSequenceNumberInitialized {
cycles := uint64(report.LastSequenceNumber&0xFFFF0000) >> 16
nr := uint64(report.LastSequenceNumber & 0x0000FFFF)
highest := cycles*(0xFFFF+1) + nr
latestStats.RemoteInboundRTPStreamStats.PacketsReceived = highest - uint64(report.TotalLost) - uint64(latestStats.remoteInboundFirstSequenceNumber) + 1
}
latestStats.RemoteInboundRTPStreamStats.PacketsLost = int64(report.TotalLost)
latestStats.RemoteInboundRTPStreamStats.Jitter = float64(report.Jitter) / r.clockRate
if report.Delay != 0 && report.LastSenderReport != 0 {
for i := min(r.maxLastSenderReports, len(latestStats.lastSenderReports)) - 1; i >= 0; i-- {
lastReport := latestStats.lastSenderReports[i]
if (lastReport&0x0000FFFFFFFF0000)>>16 == uint64(report.LastSenderReport) {
dlsr := time.Duration(float64(report.Delay) / 65536.0 * float64(time.Second))
latestStats.RemoteInboundRTPStreamStats.RoundTripTime = (ts.Add(-dlsr)).Sub(ntp.ToTime(lastReport))
latestStats.RemoteInboundRTPStreamStats.TotalRoundTripTime += latestStats.RemoteInboundRTPStreamStats.RoundTripTime
latestStats.RemoteInboundRTPStreamStats.RoundTripTimeMeasurements++
break
}
}
}
latestStats.FractionLost = float64(report.FractionLost) / 256.0
}
return latestStats
}
func (r *recorder) recordIncomingXR(latestStats internalStats, pkt *rtcp.ExtendedReport, ts time.Time) internalStats {
for _, report := range pkt.Reports {
if xr, ok := report.(*rtcp.DLRRReportBlock); ok {
for _, xrReport := range xr.Reports {
if xrReport.LastRR != 0 && xrReport.DLRR != 0 {
for i := min(r.maxLastReceiverReferenceTimes, len(latestStats.lastReceiverReferenceTimes)) - 1; i >= 0; i-- {
lastRR := latestStats.lastReceiverReferenceTimes[i]
if (lastRR&0x0000FFFFFFFF0000)>>16 == uint64(xrReport.LastRR) {
dlrr := time.Duration(float64(xrReport.DLRR) / 65536.0 * float64(time.Second))
latestStats.RemoteOutboundRTPStreamStats.RoundTripTime = (ts.Add(-dlrr)).Sub(ntp.ToTime(lastRR))
latestStats.RemoteOutboundRTPStreamStats.TotalRoundTripTime += latestStats.RemoteOutboundRTPStreamStats.RoundTripTime
latestStats.RemoteOutboundRTPStreamStats.RoundTripTimeMeasurements++
}
}
}
}
}
}
return latestStats
}
func contains(ls []uint32, e uint32) bool {
for _, x := range ls {
if x == e {
return true
}
}
return false
}
func (r *recorder) recordIncomingRTCP(latestStats internalStats, v *incomingRTCP) internalStats {
for _, pkt := range v.pkts {
if !contains(pkt.DestinationSSRC(), r.ssrc) {
r.logger.Debugf("skipping incoming RTCP pkt: %v\n", pkt)
continue
}
switch pkt := pkt.(type) {
case *rtcp.TransportLayerNack:
latestStats.OutboundRTPStreamStats.NACKCount++
case *rtcp.FullIntraRequest:
latestStats.OutboundRTPStreamStats.FIRCount++
case *rtcp.PictureLossIndication:
latestStats.OutboundRTPStreamStats.PLICount++
case *rtcp.ReceiverReport:
latestStats = r.recordIncomingRR(latestStats, pkt, v.ts)
case *rtcp.SenderReport:
latestStats.RemoteOutboundRTPStreamStats.PacketsSent = uint64(pkt.PacketCount)
latestStats.RemoteOutboundRTPStreamStats.BytesSent = uint64(pkt.OctetCount)
latestStats.RemoteTimeStamp = ntp.ToTime(pkt.NTPTime)
latestStats.ReportsSent++
case *rtcp.ExtendedReport:
return r.recordIncomingXR(latestStats, pkt, v.ts)
}
}
return latestStats
}
func (r *recorder) Start() {
atomic.StoreUint32(&r.running, 1)
}
func (r *recorder) QueueIncomingRTP(ts time.Time, buf []byte, attr interceptor.Attributes) {
if atomic.LoadUint32(&r.running) == 0 {
return
}
if attr == nil {
attr = make(interceptor.Attributes)
}
header, err := attr.GetRTPHeader(buf)
if err != nil {
r.logger.Warnf("failed to get RTP Header, skipping incoming RTP packet in stats calculation: %v", err)
return
}
hdr := header.Clone()
r.ms.Lock()
*r.latestStats = r.recordIncomingRTP(*r.latestStats, &incomingRTP{
ts: ts,
header: hdr,
payloadLen: len(buf) - hdr.MarshalSize(),
attr: attr,
})
r.ms.Unlock()
}
func (r *recorder) QueueIncomingRTCP(ts time.Time, buf []byte, attr interceptor.Attributes) {
if atomic.LoadUint32(&r.running) == 0 {
return
}
if attr == nil {
attr = make(interceptor.Attributes)
}
pkts, err := attr.GetRTCPPackets(buf)
if err != nil {
r.logger.Warnf("failed to get RTCP packets, skipping incoming RTCP packet in stats calculation: %v", err)
return
}
r.ms.Lock()
*r.latestStats = r.recordIncomingRTCP(*r.latestStats, &incomingRTCP{
ts: ts,
pkts: pkts,
attr: attr,
})
r.ms.Unlock()
}
func (r *recorder) QueueOutgoingRTP(ts time.Time, header *rtp.Header, payload []byte, attr interceptor.Attributes) {
if atomic.LoadUint32(&r.running) == 0 {
return
}
hdr := header.Clone()
r.ms.Lock()
*r.latestStats = r.recordOutgoingRTP(*r.latestStats, &outgoingRTP{
ts: ts,
header: hdr,
payloadLen: len(payload),
attr: attr,
})
r.ms.Unlock()
}
func (r *recorder) QueueOutgoingRTCP(ts time.Time, pkts []rtcp.Packet, attr interceptor.Attributes) {
if atomic.LoadUint32(&r.running) == 0 {
return
}
r.ms.Lock()
*r.latestStats = r.recordOutgoingRTCP(*r.latestStats, &outgoingRTCP{
ts: ts,
pkts: pkts,
attr: attr,
})
r.ms.Unlock()
}
func min(a, b int) int {
if a < b {
return a
}
return b
}