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streamtracker_dd.go
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streamtracker_dd.go
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// 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 streamtracker
import (
"sync"
"time"
"go.uber.org/atomic"
"github.com/livekit/livekit-server/pkg/sfu/buffer"
dd "github.com/livekit/livekit-server/pkg/sfu/rtpextension/dependencydescriptor"
)
type StreamTrackerDependencyDescriptor struct {
lock sync.RWMutex
paused bool
generation atomic.Uint32
params StreamTrackerParams
maxSpatialLayer int32
maxTemporalLayer int32
onStatusChanged [buffer.DefaultMaxLayerSpatial + 1]func(status StreamStatus)
onBitrateAvailable [buffer.DefaultMaxLayerSpatial + 1]func()
lastBitrateReport time.Time
bytesForBitrate [buffer.DefaultMaxLayerSpatial + 1][buffer.DefaultMaxLayerTemporal + 1]int64
bitrate [buffer.DefaultMaxLayerSpatial + 1][buffer.DefaultMaxLayerTemporal + 1]int64
isStopped bool
}
func NewStreamTrackerDependencyDescriptor(params StreamTrackerParams) *StreamTrackerDependencyDescriptor {
return &StreamTrackerDependencyDescriptor{
params: params,
maxSpatialLayer: buffer.InvalidLayerSpatial,
maxTemporalLayer: buffer.InvalidLayerTemporal,
}
}
func (s *StreamTrackerDependencyDescriptor) Start() {
}
func (s *StreamTrackerDependencyDescriptor) Stop() {
s.lock.Lock()
defer s.lock.Unlock()
if s.isStopped {
return
}
s.isStopped = true
// bump generation to trigger exit of worker
s.generation.Inc()
}
func (s *StreamTrackerDependencyDescriptor) OnStatusChanged(layer int32, f func(status StreamStatus)) {
s.lock.Lock()
s.onStatusChanged[layer] = f
s.lock.Unlock()
}
func (s *StreamTrackerDependencyDescriptor) OnBitrateAvailable(layer int32, f func()) {
s.lock.Lock()
s.onBitrateAvailable[layer] = f
s.lock.Unlock()
}
func (s *StreamTrackerDependencyDescriptor) Status(layer int32) StreamStatus {
s.lock.RLock()
defer s.lock.RUnlock()
if layer > s.maxSpatialLayer {
return StreamStatusStopped
}
return StreamStatusActive
}
func (s *StreamTrackerDependencyDescriptor) BitrateTemporalCumulative(layer int32) []int64 {
s.lock.RLock()
defer s.lock.RUnlock()
if layer > s.maxSpatialLayer {
brs := make([]int64, len(s.bitrate[0]))
return brs
}
return s.bitrate[layer][:]
}
func (s *StreamTrackerDependencyDescriptor) Reset() {
}
func (s *StreamTrackerDependencyDescriptor) resetLocked() {
// bump generation to trigger exit of current worker
s.generation.Inc()
for i := 0; i < len(s.bytesForBitrate); i++ {
for j := 0; j < len(s.bytesForBitrate[i]); j++ {
s.bytesForBitrate[i][j] = 0
}
}
for i := 0; i < len(s.bitrate); i++ {
for j := 0; j < len(s.bitrate[i]); j++ {
s.bitrate[i][j] = 0
}
}
}
func (s *StreamTrackerDependencyDescriptor) SetPaused(paused bool) {
s.lock.Lock()
if s.paused == paused {
s.lock.Unlock()
return
}
s.paused = paused
if !paused {
s.resetLocked()
} else {
s.lastBitrateReport = time.Now()
go s.worker(s.generation.Inc())
}
s.lock.Unlock()
}
func (s *StreamTrackerDependencyDescriptor) Observe(temporalLayer int32, pktSize int, payloadSize int, hasMarker bool, ts uint32, ddVal *buffer.ExtDependencyDescriptor) {
s.lock.Lock()
if s.isStopped || s.paused || payloadSize == 0 || ddVal == nil {
s.lock.Unlock()
return
}
var notifyFns []func(status StreamStatus)
var notifyStatus StreamStatus
if mask := ddVal.Descriptor.ActiveDecodeTargetsBitmask; mask != nil && ddVal.ActiveDecodeTargetsUpdated {
var maxSpatial, maxTemporal int32
for _, dt := range ddVal.DecodeTargets {
if *mask&(1<<dt.Target) != uint32(dd.DecodeTargetNotPresent) {
if maxSpatial < dt.Layer.Spatial {
maxSpatial = dt.Layer.Spatial
}
if maxTemporal < dt.Layer.Temporal {
maxTemporal = dt.Layer.Temporal
}
}
}
if maxSpatial > buffer.DefaultMaxLayerSpatial {
maxSpatial = buffer.DefaultMaxLayerSpatial
s.params.Logger.Warnw("max spatial layer exceeded", nil, "maxSpatial", maxSpatial)
}
if maxTemporal > buffer.DefaultMaxLayerTemporal {
maxTemporal = buffer.DefaultMaxLayerTemporal
s.params.Logger.Warnw("max temporal layer exceeded", nil, "maxTemporal", maxTemporal)
}
s.params.Logger.Debugw("max layer changed", "maxSpatial", maxSpatial, "maxTemporal", maxTemporal)
oldMaxSpatial := s.maxSpatialLayer
s.maxSpatialLayer, s.maxTemporalLayer = maxSpatial, maxTemporal
if oldMaxSpatial == -1 {
s.lastBitrateReport = time.Now()
go s.worker(s.generation.Inc())
}
if oldMaxSpatial > s.maxSpatialLayer {
notifyStatus = StreamStatusStopped
for i := s.maxSpatialLayer + 1; i <= oldMaxSpatial; i++ {
notifyFns = append(notifyFns, s.onStatusChanged[i])
}
} else if oldMaxSpatial < s.maxSpatialLayer {
notifyStatus = StreamStatusActive
for i := oldMaxSpatial + 1; i <= s.maxSpatialLayer; i++ {
notifyFns = append(notifyFns, s.onStatusChanged[i])
}
}
}
dtis := ddVal.Descriptor.FrameDependencies.DecodeTargetIndications
for _, dt := range ddVal.DecodeTargets {
if len(dtis) <= dt.Target {
s.params.Logger.Errorw("len(dtis) less than target", nil, "target", dt.Target, "dtis", dtis)
continue
}
// we are not dropping discardable frames now, so only ingore not present frames
if dtis[dt.Target] == dd.DecodeTargetNotPresent {
continue
}
s.bytesForBitrate[dt.Layer.Spatial][dt.Layer.Temporal] += int64(pktSize)
}
s.lock.Unlock()
for _, fn := range notifyFns {
if fn != nil {
fn(notifyStatus)
}
}
}
func (s *StreamTrackerDependencyDescriptor) worker(generation uint32) {
tickerBitrate := time.NewTicker(s.params.BitrateReportInterval)
defer tickerBitrate.Stop()
for {
<-tickerBitrate.C
if generation != s.generation.Load() {
return
}
s.bitrateReport()
}
}
func (s *StreamTrackerDependencyDescriptor) bitrateReport() {
// run this even if paused to drain out bitrate if there are no packets coming in
s.lock.Lock()
now := time.Now()
diff := now.Sub(s.lastBitrateReport)
s.lastBitrateReport = now
var availableChangedFns []func()
for spatial := 0; spatial < len(s.bytesForBitrate); spatial++ {
bytesForBitrate := s.bytesForBitrate[spatial][:]
bitrateAvailabilityChanged := false
bitrates := s.bitrate[spatial][:]
for i := 0; i < len(bytesForBitrate); i++ {
bitrate := int64(float64(bytesForBitrate[i]*8) / diff.Seconds())
if (bitrates[i] == 0 && bitrate > 0) || (bitrates[i] > 0 && bitrate == 0) {
bitrateAvailabilityChanged = true
}
bitrates[i] = bitrate
bytesForBitrate[i] = 0
}
if bitrateAvailabilityChanged && s.onBitrateAvailable[spatial] != nil {
availableChangedFns = append(availableChangedFns, s.onBitrateAvailable[spatial])
}
}
s.lock.Unlock()
for _, fn := range availableChangedFns {
fn()
}
}
func (s *StreamTrackerDependencyDescriptor) LayeredTracker(layer int32) *StreamTrackerDependencyDescriptorLayered {
return &StreamTrackerDependencyDescriptorLayered{
StreamTrackerDependencyDescriptor: s,
layer: layer,
}
}
// ----------------------------
// Layered wrapper for StreamTrackerWorker
type StreamTrackerDependencyDescriptorLayered struct {
*StreamTrackerDependencyDescriptor
layer int32
}
func (s *StreamTrackerDependencyDescriptorLayered) OnStatusChanged(f func(status StreamStatus)) {
s.StreamTrackerDependencyDescriptor.OnStatusChanged(s.layer, f)
}
func (s *StreamTrackerDependencyDescriptorLayered) OnBitrateAvailable(f func()) {
s.StreamTrackerDependencyDescriptor.OnBitrateAvailable(s.layer, f)
}
func (s *StreamTrackerDependencyDescriptorLayered) Status() StreamStatus {
return s.StreamTrackerDependencyDescriptor.Status(s.layer)
}
func (s *StreamTrackerDependencyDescriptorLayered) BitrateTemporalCumulative() []int64 {
return s.StreamTrackerDependencyDescriptor.BitrateTemporalCumulative(s.layer)
}