Files
livekit/pkg/sfu/buffer/rtpstats_receiver.go
2023-11-17 00:40:00 +05:30

433 lines
12 KiB
Go

// Copyright 2023 LiveKit, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package buffer
import (
"fmt"
"math"
"time"
"github.com/pion/rtcp"
"github.com/livekit/livekit-server/pkg/sfu/utils"
"github.com/livekit/protocol/livekit"
protoutils "github.com/livekit/protocol/utils"
)
const (
cHistorySize = 4096
)
type RTPFlowState struct {
IsNotHandled bool
HasLoss bool
LossStartInclusive uint64
LossEndExclusive uint64
IsDuplicate bool
IsOutOfOrder bool
ExtSequenceNumber uint64
ExtTimestamp uint64
}
type RTPStatsReceiver struct {
*rtpStatsBase
sequenceNumber *utils.WrapAround[uint16, uint64]
timestamp *utils.WrapAround[uint32, uint64]
history *protoutils.Bitmap[uint64]
clockSkewCount int
outOfOrderSsenderReportCount int
}
func NewRTPStatsReceiver(params RTPStatsParams) *RTPStatsReceiver {
return &RTPStatsReceiver{
rtpStatsBase: newRTPStatsBase(params),
sequenceNumber: utils.NewWrapAround[uint16, uint64](utils.WrapAroundParams{IsRestartAllowed: false}),
timestamp: utils.NewWrapAround[uint32, uint64](utils.WrapAroundParams{IsRestartAllowed: false}),
history: protoutils.NewBitmap[uint64](cHistorySize),
}
}
func (r *RTPStatsReceiver) NewSnapshotId() uint32 {
r.lock.Lock()
defer r.lock.Unlock()
return r.newSnapshotID(r.sequenceNumber.GetExtendedHighest())
}
func (r *RTPStatsReceiver) Update(
packetTime time.Time,
sequenceNumber uint16,
timestamp uint32,
marker bool,
hdrSize int,
payloadSize int,
paddingSize int,
) (flowState RTPFlowState) {
r.lock.Lock()
defer r.lock.Unlock()
if !r.endTime.IsZero() {
flowState.IsNotHandled = true
return
}
var resSN utils.WrapAroundUpdateResult[uint64]
var resTS utils.WrapAroundUpdateResult[uint64]
if !r.initialized {
if payloadSize == 0 {
// do not start on a padding only packet
flowState.IsNotHandled = true
return
}
r.initialized = true
r.startTime = time.Now()
r.firstTime = packetTime
r.highestTime = packetTime
resSN = r.sequenceNumber.Update(sequenceNumber)
resTS = r.timestamp.Update(timestamp)
// initialize snapshots if any
for i := uint32(0); i < r.nextSnapshotID-cFirstSnapshotID; i++ {
r.snapshots[i] = r.initSnapshot(r.startTime, r.sequenceNumber.GetExtendedStart())
}
r.logger.Debugw(
"rtp receiver stream start",
"startTime", r.startTime.String(),
"firstTime", r.firstTime.String(),
"startSN", r.sequenceNumber.GetExtendedStart(),
"startTS", r.timestamp.GetExtendedStart(),
)
} else {
resSN = r.sequenceNumber.Update(sequenceNumber)
if resSN.IsUnhandled {
flowState.IsNotHandled = true
return
}
resTS = r.timestamp.Update(timestamp)
}
pktSize := uint64(hdrSize + payloadSize + paddingSize)
gapSN := int64(resSN.ExtendedVal - resSN.PreExtendedHighest)
if gapSN <= 0 { // duplicate OR out-of-order
if -gapSN >= cNumSequenceNumbers/2 {
r.logger.Warnw(
"large sequence number gap negative", nil,
"extStartSN", r.sequenceNumber.GetExtendedStart(),
"extHighestSN", r.sequenceNumber.GetExtendedHighest(),
"extStartTS", r.timestamp.GetExtendedStart(),
"extHighestTS", r.timestamp.GetExtendedHighest(),
"firstTime", r.firstTime.String(),
"highestTime", r.highestTime.String(),
"prev", resSN.PreExtendedHighest,
"curr", resSN.ExtendedVal,
"gap", gapSN,
"packetTime", packetTime.String(),
"sequenceNumber", sequenceNumber,
"timestamp", timestamp,
"marker", marker,
"hdrSize", hdrSize,
"payloadSize", payloadSize,
"paddingSize", paddingSize,
)
}
if gapSN != 0 {
r.packetsOutOfOrder++
}
if r.isInRange(resSN.ExtendedVal, resSN.PreExtendedHighest) {
if r.history.IsSet(resSN.ExtendedVal) {
r.bytesDuplicate += pktSize
r.headerBytesDuplicate += uint64(hdrSize)
r.packetsDuplicate++
flowState.IsDuplicate = true
} else {
r.packetsLost--
r.history.Set(resSN.ExtendedVal)
}
}
flowState.IsOutOfOrder = true
flowState.ExtSequenceNumber = resSN.ExtendedVal
flowState.ExtTimestamp = resTS.ExtendedVal
} else { // in-order
if gapSN >= cNumSequenceNumbers/2 {
r.logger.Warnw(
"large sequence number gap", nil,
"extStartSN", r.sequenceNumber.GetExtendedStart(),
"extHighestSN", r.sequenceNumber.GetExtendedHighest(),
"extStartTS", r.timestamp.GetExtendedStart(),
"extHighestTS", r.timestamp.GetExtendedHighest(),
"firstTime", r.firstTime.String(),
"highestTime", r.highestTime.String(),
"prev", resSN.PreExtendedHighest,
"curr", resSN.ExtendedVal,
"gap", gapSN,
"packetTime", packetTime.String(),
"sequenceNumber", sequenceNumber,
"timestamp", timestamp,
"marker", marker,
"hdrSize", hdrSize,
"payloadSize", payloadSize,
"paddingSize", paddingSize,
)
}
// update gap histogram
r.updateGapHistogram(int(gapSN))
// update missing sequence numbers
r.history.ClearRange(resSN.PreExtendedHighest+1, resSN.ExtendedVal-1)
r.packetsLost += uint64(gapSN - 1)
r.history.Set(resSN.ExtendedVal)
if timestamp != uint32(resTS.PreExtendedHighest) {
// update only on first packet as same timestamp could be in multiple packets.
// NOTE: this may not be the first packet with this time stamp if there is packet loss.
r.highestTime = packetTime
}
if gapSN > 1 {
flowState.HasLoss = true
flowState.LossStartInclusive = resSN.PreExtendedHighest + 1
flowState.LossEndExclusive = resSN.ExtendedVal
}
flowState.ExtSequenceNumber = resSN.ExtendedVal
flowState.ExtTimestamp = resTS.ExtendedVal
}
if !flowState.IsDuplicate {
if payloadSize == 0 {
r.packetsPadding++
r.bytesPadding += pktSize
r.headerBytesPadding += uint64(hdrSize)
} else {
r.bytes += pktSize
r.headerBytes += uint64(hdrSize)
if marker {
r.frames++
}
r.updateJitter(resTS.ExtendedVal, packetTime)
}
}
return
}
func (r *RTPStatsReceiver) SetRtcpSenderReportData(srData *RTCPSenderReportData) {
r.lock.Lock()
defer r.lock.Unlock()
if srData == nil || !r.initialized {
return
}
// prevent against extreme case of anachronous sender reports
if r.srNewest != nil && r.srNewest.NTPTimestamp > srData.NTPTimestamp {
r.logger.Infow(
"received anachronous sender report",
"last", r.srNewest.ToString(),
"current", srData.ToString(),
)
return
}
tsCycles := uint64(0)
if r.srNewest != nil {
tsCycles = r.srNewest.RTPTimestampExt & 0xFFFF_FFFF_0000_0000
if (srData.RTPTimestamp-r.srNewest.RTPTimestamp) < (1<<31) && srData.RTPTimestamp < r.srNewest.RTPTimestamp {
tsCycles += (1 << 32)
}
}
srDataCopy := *srData
srDataCopy.RTPTimestampExt = uint64(srDataCopy.RTPTimestamp) + tsCycles
r.maybeAdjustFirstPacketTime(srDataCopy.RTPTimestamp, r.timestamp.GetStart())
if r.srNewest != nil {
timeSinceLast := srData.NTPTimestamp.Time().Sub(r.srNewest.NTPTimestamp.Time()).Seconds()
rtpDiffSinceLast := srDataCopy.RTPTimestampExt - r.srNewest.RTPTimestampExt
calculatedClockRateFromLast := float64(rtpDiffSinceLast) / timeSinceLast
timeSinceFirst := srData.NTPTimestamp.Time().Sub(r.srFirst.NTPTimestamp.Time()).Seconds()
rtpDiffSinceFirst := srDataCopy.RTPTimestampExt - r.srFirst.RTPTimestampExt
calculatedClockRateFromFirst := float64(rtpDiffSinceFirst) / timeSinceFirst
if (timeSinceLast > 0.2 && math.Abs(float64(r.params.ClockRate)-calculatedClockRateFromLast) > 0.2*float64(r.params.ClockRate)) ||
(timeSinceFirst > 0.2 && math.Abs(float64(r.params.ClockRate)-calculatedClockRateFromFirst) > 0.2*float64(r.params.ClockRate)) {
if r.clockSkewCount%100 == 0 {
r.logger.Infow(
"clock rate skew",
"first", r.srFirst.ToString(),
"last", r.srNewest.ToString(),
"current", srDataCopy.ToString(),
"calculatedFirst", calculatedClockRateFromFirst,
"calculatedLast", calculatedClockRateFromLast,
"count", r.clockSkewCount,
)
}
r.clockSkewCount++
}
}
if r.srNewest != nil && srDataCopy.RTPTimestampExt < r.srNewest.RTPTimestampExt {
// This can happen when a track is replaced with a null and then restored -
// i. e. muting replacing with null and unmute restoring the original track.
// Under such a condition reset the sender reports to start from this point.
// Resetting will ensure sample rate calculations do not go haywire due to negative time.
if r.outOfOrderSsenderReportCount%10 == 0 {
r.logger.Infow(
"received sender report, out-of-order, resetting",
"last", r.srNewest.ToString(),
"current", srDataCopy.ToString(),
"count", r.outOfOrderSsenderReportCount,
)
}
r.outOfOrderSsenderReportCount++
r.srFirst = nil
}
r.srNewest = &srDataCopy
if r.srFirst == nil {
r.srFirst = &srDataCopy
}
}
func (r *RTPStatsReceiver) GetRtcpSenderReportData() (srFirst *RTCPSenderReportData, srNewest *RTCPSenderReportData) {
r.lock.RLock()
defer r.lock.RUnlock()
if r.srFirst != nil {
srFirstCopy := *r.srFirst
srFirst = &srFirstCopy
}
if r.srNewest != nil {
srNewestCopy := *r.srNewest
srNewest = &srNewestCopy
}
return
}
func (r *RTPStatsReceiver) GetRtcpReceptionReport(ssrc uint32, proxyFracLost uint8, snapshotID uint32) *rtcp.ReceptionReport {
r.lock.Lock()
defer r.lock.Unlock()
extHighestSN := r.sequenceNumber.GetExtendedHighest()
then, now := r.getAndResetSnapshot(snapshotID, r.sequenceNumber.GetExtendedStart(), extHighestSN)
if now == nil || then == nil {
return nil
}
packetsExpected := now.extStartSN - then.extStartSN
if packetsExpected > cNumSequenceNumbers {
r.logger.Warnw(
"too many packets expected in receiver report",
fmt.Errorf("start: %d, end: %d, expected: %d", then.extStartSN, now.extStartSN, packetsExpected),
)
return nil
}
if packetsExpected == 0 {
return nil
}
packetsLost := uint32(now.packetsLost - then.packetsLost)
if int32(packetsLost) < 0 {
packetsLost = 0
}
lossRate := float32(packetsLost) / float32(packetsExpected)
fracLost := uint8(lossRate * 256.0)
if proxyFracLost > fracLost {
fracLost = proxyFracLost
}
totalLost := r.packetsLost
if totalLost > 0xffffff { // 24-bits max
totalLost = 0xffffff
}
lastSR := uint32(0)
dlsr := uint32(0)
if r.srNewest != nil {
lastSR = uint32(r.srNewest.NTPTimestamp >> 16)
if !r.srNewest.At.IsZero() {
delayUS := time.Since(r.srNewest.At).Microseconds()
dlsr = uint32(delayUS * 65536 / 1e6)
}
}
return &rtcp.ReceptionReport{
SSRC: ssrc,
FractionLost: fracLost,
TotalLost: uint32(totalLost),
LastSequenceNumber: uint32(now.extStartSN),
Jitter: uint32(r.jitter),
LastSenderReport: lastSR,
Delay: dlsr,
}
}
func (r *RTPStatsReceiver) DeltaInfo(snapshotID uint32) *RTPDeltaInfo {
r.lock.Lock()
defer r.lock.Unlock()
return r.deltaInfo(snapshotID, r.sequenceNumber.GetExtendedStart(), r.sequenceNumber.GetExtendedHighest())
}
func (r *RTPStatsReceiver) ToString() string {
r.lock.RLock()
defer r.lock.RUnlock()
return r.toString(
r.sequenceNumber.GetExtendedStart(), r.sequenceNumber.GetExtendedHighest(), r.timestamp.GetExtendedStart(), r.timestamp.GetExtendedHighest(),
r.packetsLost,
r.jitter, r.maxJitter,
)
}
func (r *RTPStatsReceiver) ToProto() *livekit.RTPStats {
r.lock.RLock()
defer r.lock.RUnlock()
return r.toProto(
r.sequenceNumber.GetExtendedStart(), r.sequenceNumber.GetExtendedHighest(), r.timestamp.GetExtendedStart(), r.timestamp.GetExtendedHighest(),
r.packetsLost,
r.jitter, r.maxJitter,
)
}
func (r *RTPStatsReceiver) isInRange(esn uint64, ehsn uint64) bool {
diff := int64(ehsn - esn)
return diff >= 0 && diff < cHistorySize
}
// ----------------------------------