buffer

package
v0.0.0-...-95199c0 Latest Latest
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This package is not in the latest version of its module.

 Go to latest Published: May 20, 2026 License: Apache-2.0 Imports: 33 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	InitPacketBufferSizeVideo = 300
	InitPacketBufferSizeAudio = 70
)
View Source 
const (
	InvalidLayerSpatial  = int32(-1)
	InvalidLayerTemporal = int32(-1)

	DefaultMaxLayerSpatial  = int32(2)
	DefaultMaxLayerTemporal = int32(3)
)

Variables

View Source 
var (
	ErrFrameEarlierThanKeyFrame            = fmt.Errorf("frame is earlier than current keyframe")
	ErrDDStructureAttachedToNonFirstPacket = fmt.Errorf("dependency descriptor structure is attached to non-first packet of a frame")
	ErrDDExtentionNotFound                 = fmt.Errorf("dependency descriptor extension not found")
)
View Source 
var (
	InvalidLayer = VideoLayer{
		Spatial:  InvalidLayerSpatial,
		Temporal: InvalidLayerTemporal,
	}

	DefaultMaxLayer = VideoLayer{
		Spatial:  DefaultMaxLayerSpatial,
		Temporal: DefaultMaxLayerTemporal,
	}
)
View Source 
var (
	DefaultVideoLayersRid = videoLayersRidQHF
)
View Source 
var (
	ExtDependencyDescriptorFactory = &sync.Pool{
		New: func() any {
			return &ExtDependencyDescriptor{}
		},
	}
)
View Source 
var (
	ExtPacketFactory = &sync.Pool{
		New: func() any {
			return &ExtPacket{}
		},
	}
)

Functions

func ExtractDependencyDescriptorVideoSize 

func ExtractDependencyDescriptorVideoSize(dd *dd.DependencyDescriptor) []codec.VideoSize

func GetActiveDecodeTargetBitmask 

func GetActiveDecodeTargetBitmask(layer VideoLayer, decodeTargets []DependencyDescriptorDecodeTarget) *uint32

func GetSpatialLayerForRid 

func GetSpatialLayerForRid(mimeType mime.MimeType, rid string, ti *livekit.TrackInfo) int32

func GetSpatialLayerForVideoQuality 

func GetSpatialLayerForVideoQuality(mimeType mime.MimeType, quality livekit.VideoQuality, ti *livekit.TrackInfo) int32

func GetVideoLayerModeForMimeType 

func GetVideoLayerModeForMimeType(mimeType mime.MimeType, ti *livekit.TrackInfo) livekit.VideoLayer_Mode

func GetVideoLayersForMimeType 

func GetVideoLayersForMimeType(mimeType mime.MimeType, ti *livekit.TrackInfo) []*livekit.VideoLayer

func GetVideoQualityForSpatialLayer 

func GetVideoQualityForSpatialLayer(mimeType mime.MimeType, spatialLayer int32, ti *livekit.TrackInfo) livekit.VideoQuality

func LayerPresenceFromTrackInfo 

func LayerPresenceFromTrackInfo(mimeType mime.MimeType, trackInfo *livekit.TrackInfo) *[livekit.VideoQuality_HIGH + 1]bool

func ReleaseExtDependencyDescriptor 

func ReleaseExtDependencyDescriptor(extDD *ExtDependencyDescriptor)

func ReleaseExtPacket 

func ReleaseExtPacket(extPkt *ExtPacket)

func RidToSpatialLayer 

func RidToSpatialLayer(mimeType mime.MimeType, rid string, trackInfo *livekit.TrackInfo, ridSpace VideoLayersRid) int32

func SpatialLayerToRid 

func SpatialLayerToRid(mimeType mime.MimeType, layer int32, trackInfo *livekit.TrackInfo, ridSpace VideoLayersRid) string

func SpatialLayerToVideoQuality 

func SpatialLayerToVideoQuality(mimeType mime.MimeType, layer int32, trackInfo *livekit.TrackInfo) livekit.VideoQuality

func VideoQualityToRid 

func VideoQualityToRid(mimeType mime.MimeType, quality livekit.VideoQuality, trackInfo *livekit.TrackInfo, ridSpace VideoLayersRid) string

func VideoQualityToSpatialLayer 

func VideoQualityToSpatialLayer(mimeType mime.MimeType, quality livekit.VideoQuality, trackInfo *livekit.TrackInfo) int32

Types

type Buffer 

type Buffer struct {
	*BufferBase
	// contains filtered or unexported fields
}

Buffer contains all packets

func NewBuffer 

func NewBuffer(ssrc uint32, maxVideoPkts, maxAudioPkts int) *Buffer

func (*Buffer) Bind 

func (b *Buffer) Bind(params webrtc.RTPParameters, codec webrtc.RTPCodecCapability, bitrates int) error

func (*Buffer) Close 

func (b *Buffer) Close() error

func (*Buffer) NotifyRTX 

func (b *Buffer) NotifyRTX(ssrc uint32, repairSSRC uint32, rsid string)

func (*Buffer) OnClose 

func (b *Buffer) OnClose(fn func())

func (*Buffer) OnFinalRtpStats 

func (b *Buffer) OnFinalRtpStats(fn func(*livekit.RTPStats))

func (*Buffer) OnNotifyRTX 

func (b *Buffer) OnNotifyRTX(fn func(ssrc uint32, repairSSRC uint32, rsid string))

func (*Buffer) OnRtcpFeedback 

func (b *Buffer) OnRtcpFeedback(fn func(fb []rtcp.Packet))

func (*Buffer) Read 

func (b *Buffer) Read(buff []byte) (n int, err error)

func (*Buffer) SetAudioLossProxying 

func (b *Buffer) SetAudioLossProxying(enable bool)

func (*Buffer) SetLastFractionLostReport 

func (b *Buffer) SetLastFractionLostReport(lost uint8)

func (*Buffer) SetPrimaryBufferForRTX 

func (b *Buffer) SetPrimaryBufferForRTX(primaryBuffer *Buffer)

func (*Buffer) SetTWCCAndExtID 

func (b *Buffer) SetTWCCAndExtID(twcc *twcc.Responder, extID uint8)

func (*Buffer) Write 

func (b *Buffer) Write(pkt []byte) (n int, err error)

Write adds an RTP Packet, ordering is not guaranteed, newer packets may arrive later

type BufferBase 

type BufferBase struct {
	sync.RWMutex
	// contains filtered or unexported fields
}

func NewBufferBase 

func NewBufferBase(params BufferBaseParams) *BufferBase

func (*BufferBase) Bind 

func (b *BufferBase) Bind(rtpParameters webrtc.RTPParameters, codec webrtc.RTPCodecCapability, bitrate int) error

func (*BufferBase) BindLocked 

func (b *BufferBase) BindLocked(rtpParameters webrtc.RTPParameters, codec webrtc.RTPCodecCapability, bitrate int) error

func (*BufferBase) CloseWithReason 

func (b *BufferBase) CloseWithReason(reason string) (stats *livekit.RTPStats, err error)

func (*BufferBase) GetAudioLevel 

func (b *BufferBase) GetAudioLevel() (float64, bool)

func (*BufferBase) GetDeltaStats 

func (b *BufferBase) GetDeltaStats() *StreamStatsWithLayers

func (*BufferBase) GetDeltaStatsLite 

func (b *BufferBase) GetDeltaStatsLite() *rtpstats.RTPDeltaInfoLite

func (*BufferBase) GetLastSenderReportTime 

func (b *BufferBase) GetLastSenderReportTime() time.Time

func (*BufferBase) GetNACKPairs 

func (b *BufferBase) GetNACKPairs() []rtcp.NackPair

func (*BufferBase) GetNACKPairsLocked 

func (b *BufferBase) GetNACKPairsLocked() []rtcp.NackPair

func (*BufferBase) GetPacket 

func (b *BufferBase) GetPacket(buff []byte, esn uint64) (int, error)

func (*BufferBase) GetRtcpReceptionReportLocked 

func (b *BufferBase) GetRtcpReceptionReportLocked(proxyLoss uint8) *rtcp.ReceptionReport

func (*BufferBase) GetSenderReportData 

func (b *BufferBase) GetSenderReportData() *livekit.RTCPSenderReportState

func (*BufferBase) GetStats 

func (b *BufferBase) GetStats() *livekit.RTPStats

func (*BufferBase) GetTemporalLayerFpsForSpatial 

func (b *BufferBase) GetTemporalLayerFpsForSpatial(layer int32) []float32

func (*BufferBase) HandleIncomingPacket 

func (b *BufferBase) HandleIncomingPacket(
	rawPkt []byte,
	rtpPacket *rtp.Packet,
	arrivalTime int64,
	isBuffered bool,
	isRTX bool,
	skippedSeqs []uint16,
	oobSequenceNumber uint16,
) (uint64, error)

func (*BufferBase) HandleIncomingPacketLocked 

func (b *BufferBase) HandleIncomingPacketLocked(
	rawPkt []byte,
	rtpPacket *rtp.Packet,
	arrivalTime int64,
	isBuffered bool,
	isRTX bool,
	skippedSeqs []uint16,
	oobSequenceNumber uint16,
) (uint64, error)

func (*BufferBase) IsClosed 

func (b *BufferBase) IsClosed() bool

func (*BufferBase) MarkForRestartStream 

func (b *BufferBase) MarkForRestartStream(reason string)

func (*BufferBase) MaxAudioPkts 

func (b *BufferBase) MaxAudioPkts() int

func (*BufferBase) MaxVideoPkts 

func (b *BufferBase) MaxVideoPkts() int

func (*BufferBase) NotifyRead 

func (b *BufferBase) NotifyRead()

func (*BufferBase) OnCodecChange 

func (b *BufferBase) OnCodecChange(fn func(webrtc.RTPCodecParameters))

func (*BufferBase) OnFpsChanged 

func (b *BufferBase) OnFpsChanged(f func())

func (*BufferBase) OnRtcpSenderReport 

func (b *BufferBase) OnRtcpSenderReport(fn func())

func (*BufferBase) OnStreamRestart 

func (b *BufferBase) OnStreamRestart(fn func(string))

func (*BufferBase) OnVideoSizeChanged 

func (b *BufferBase) OnVideoSizeChanged(fn func([]codec.VideoSize))

func (*BufferBase) ReadExtended 

func (b *BufferBase) ReadExtended(buf []byte) (*ExtPacket, error)

func (*BufferBase) RestartOOBSequenceNumber 

func (b *BufferBase) RestartOOBSequenceNumber(reason string)

func (*BufferBase) RestartStream 

func (b *BufferBase) RestartStream(reason string)

func (*BufferBase) SSRC 

func (b *BufferBase) SSRC() uint32

func (*BufferBase) SendPLI 

func (b *BufferBase) SendPLI(force bool)

func (*BufferBase) SetAudioLevelConfig 

func (b *BufferBase) SetAudioLevelConfig(audioLevelConfig audio.AudioLevelConfig)

func (*BufferBase) SetLogger 

func (b *BufferBase) SetLogger(lgr logger.Logger)

func (*BufferBase) SetPLIThrottle 

func (b *BufferBase) SetPLIThrottle(duration int64)

func (*BufferBase) SetPaused 

func (b *BufferBase) SetPaused(paused bool)

func (*BufferBase) SetRTT 

func (b *BufferBase) SetRTT(rtt uint32)

func (*BufferBase) SetSenderReportData 

func (b *BufferBase) SetSenderReportData(srData *livekit.RTCPSenderReportState)

func (*BufferBase) SetStreamRestartDetection 

func (b *BufferBase) SetStreamRestartDetection(enable bool)

func (*BufferBase) StartKeyFrameSeeder 

func (b *BufferBase) StartKeyFrameSeeder()

func (*BufferBase) StopKeyFrameSeeder 

func (b *BufferBase) StopKeyFrameSeeder()

func (*BufferBase) WaitRead 

func (b *BufferBase) WaitRead()

type BufferBaseParams 

type BufferBaseParams struct {
	SSRC                uint32
	MaxVideoPkts        int
	MaxAudioPkts        int
	LoggerComponents    []string
	SendPLI             func()
	IsReportingEnabled  bool
	IsOOBSequenceNumber bool
	IsDDRestartEnabled  bool
}

type BufferProvider 

type BufferProvider interface {
	SetLogger(lgr logger.Logger)
	SetAudioLevelConfig(audioLevelConfig audio.AudioLevelConfig)
	SetStreamRestartDetection(enable bool)
	SetPLIThrottle(duration int64)
	SetRTT(rtt uint32)
	SetPaused(paused bool)

	SendPLI(force bool)

	ReadExtended(buf []byte) (*ExtPacket, error)
	GetPacket(buf []byte, esn uint64) (int, error)

	GetAudioLevel() (float64, bool)
	GetTemporalLayerFpsForSpatial(layer int32) []float32
	GetStats() *livekit.RTPStats
	GetDeltaStats() *StreamStatsWithLayers
	GetDeltaStatsLite() *rtpstats.RTPDeltaInfoLite
	GetLastSenderReportTime() time.Time
	GetNACKPairs() []rtcp.NackPair

	SetSenderReportData(srData *livekit.RTCPSenderReportState)
	GetSenderReportData() *livekit.RTCPSenderReportState

	OnRtcpSenderReport(fn func())
	OnFpsChanged(fn func())
	OnVideoSizeChanged(fn func([]codec.VideoSize))
	OnCodecChange(fn func(webrtc.RTPCodecParameters))
	OnStreamRestart(fn func(string))

	StartKeyFrameSeeder()
	StopKeyFrameSeeder()

	HandleIncomingPacket(
		rawPkt []byte,
		rtpPacket *rtp.Packet,
		arrivalTime int64,
		isBuffered bool,
		isRTX bool,
		skippedSeqs []uint16,
		oobSequenceNumber uint16,
	) (uint64, error)

	MarkForRestartStream(reason string)
	RestartStream(reason string)

	CloseWithReason(reason string) (*livekit.RTPStats, error)
}

type DataStats 

type DataStats struct {
	// contains filtered or unexported fields
}

func NewDataStats 

func NewDataStats(params DataStatsParam) *DataStats

func (*DataStats) Stop 

func (s *DataStats) Stop()

func (*DataStats) ToProtoActive 

func (s *DataStats) ToProtoActive() *livekit.RTPStats

func (*DataStats) ToProtoAggregateOnly 

func (s *DataStats) ToProtoAggregateOnly() *livekit.RTPStats

func (*DataStats) Update 

func (s *DataStats) Update(bytes int, time int64)

type DataStatsParam 

type DataStatsParam struct {
	WindowDuration time.Duration
}

type DependencyDescriptorDecodeTarget 

type DependencyDescriptorDecodeTarget struct {
	Target int
	Layer  VideoLayer
}

func ProcessFrameDependencyStructure 

func ProcessFrameDependencyStructure(structure *dd.FrameDependencyStructure) []DependencyDescriptorDecodeTarget

func (*DependencyDescriptorDecodeTarget) String 

func (dt *DependencyDescriptorDecodeTarget) String() string

type DependencyDescriptorParser 

type DependencyDescriptorParser struct {
	// contains filtered or unexported fields
}

func NewDependencyDescriptorParser 

func NewDependencyDescriptorParser(ddExtID uint8, logger logger.Logger, onMaxLayerChanged func(int32, int32), enableRestart bool) *DependencyDescriptorParser

func (*DependencyDescriptorParser) Parse 

func (r *DependencyDescriptorParser) Parse(pkt *rtp.Packet) (*ExtDependencyDescriptor, VideoLayer, error)

type ExtDependencyDescriptor 

type ExtDependencyDescriptor struct {
	Descriptor *dd.DependencyDescriptor

	DecodeTargets              []DependencyDescriptorDecodeTarget
	StructureUpdated           bool
	ActiveDecodeTargetsUpdated bool
	Integrity                  bool
	ExtFrameNum                uint64
	// the frame number of the keyframe which the current frame depends on
	ExtKeyFrameNum uint64

	// increase when the stream restarts, clear and reinitialize all dd state includes
	// attached structure, frame chain, decode target.
	RestartGeneration int
}

type ExtPacket 

type ExtPacket struct {
	VideoLayer
	Arrival              int64
	ExtSequenceNumber    uint64
	ExtTimestamp         uint64
	Packet               *rtp.Packet
	Payload              any
	IsKeyFrame           bool
	RawPacket            []byte
	DependencyDescriptor *ExtDependencyDescriptor
	AbsCaptureTimeExt    *act.AbsCaptureTime
	IsOutOfOrder         bool
	IsBuffered           bool
}

type Factory 

type Factory struct {
	sync.RWMutex
	// contains filtered or unexported fields
}

func (*Factory) GetBuffer 

func (f *Factory) GetBuffer(ssrc uint32) *Buffer

func (*Factory) GetBufferPair 

func (f *Factory) GetBufferPair(ssrc uint32) (*Buffer, *RTCPReader)

func (*Factory) GetOrNew 

func (f *Factory) GetOrNew(packetType packetio.BufferPacketType, ssrc uint32) io.ReadWriteCloser

func (*Factory) GetRTCPReader 

func (f *Factory) GetRTCPReader(ssrc uint32) *RTCPReader

func (*Factory) SetRTXPair 

func (f *Factory) SetRTXPair(repair, base uint32, rsid string)

type FactoryOfBufferFactory 

type FactoryOfBufferFactory struct {
	// contains filtered or unexported fields
}

func NewFactoryOfBufferFactory 

func NewFactoryOfBufferFactory(trackingPacketsVideo int, trackingPacketsAudio int) *FactoryOfBufferFactory

func (*FactoryOfBufferFactory) CreateBufferFactory 

func (f *FactoryOfBufferFactory) CreateBufferFactory() *Factory

type FrameEntity 

type FrameEntity struct {
	// contains filtered or unexported fields
}

func (*FrameEntity) AddPacket 

func (fe *FrameEntity) AddPacket(extSeq uint64, ddVal *dd.DependencyDescriptor)

func (*FrameEntity) Integrity 

func (fe *FrameEntity) Integrity() bool

func (*FrameEntity) Reset 

func (fe *FrameEntity) Reset()

type FrameIntegrityChecker 

type FrameIntegrityChecker struct {
	// contains filtered or unexported fields
}

func NewFrameIntegrityChecker 

func NewFrameIntegrityChecker(frameCount, packetCount int) *FrameIntegrityChecker

func (*FrameIntegrityChecker) AddPacket 

func (fc *FrameIntegrityChecker) AddPacket(extSeq uint64, extFrameNum uint64, ddVal *dd.DependencyDescriptor)

func (*FrameIntegrityChecker) FrameIntegrity 

func (fc *FrameIntegrityChecker) FrameIntegrity(extFrameNum uint64) bool

type FrameRateCalculator 

type FrameRateCalculator interface {
	RecvPacket(ep *ExtPacket) bool
	GetFrameRate() []float32
	Completed() bool
}

type FrameRateCalculatorDD 

type FrameRateCalculatorDD struct {
	// contains filtered or unexported fields
}

FrameRateCalculator based on Dependency descriptor

func NewFrameRateCalculatorDD 

func NewFrameRateCalculatorDD(clockRate uint32, logger logger.Logger) *FrameRateCalculatorDD

func (*FrameRateCalculatorDD) Completed 

func (f *FrameRateCalculatorDD) Completed() bool

func (*FrameRateCalculatorDD) GetFrameRateCalculatorForSpatial 

func (f *FrameRateCalculatorDD) GetFrameRateCalculatorForSpatial(spatial int32) *FrameRateCalculatorForDDLayer

func (*FrameRateCalculatorDD) GetFrameRateForSpatial 

func (f *FrameRateCalculatorDD) GetFrameRateForSpatial(spatial int32) []float32

func (*FrameRateCalculatorDD) RecvPacket 

func (f *FrameRateCalculatorDD) RecvPacket(ep *ExtPacket) bool

func (*FrameRateCalculatorDD) SetMaxLayer 

func (f *FrameRateCalculatorDD) SetMaxLayer(spatial, temporal int32)

type FrameRateCalculatorForDDLayer 

type FrameRateCalculatorForDDLayer struct {
	*FrameRateCalculatorDD
	// contains filtered or unexported fields
}

func (*FrameRateCalculatorForDDLayer) GetFrameRate 

func (f *FrameRateCalculatorForDDLayer) GetFrameRate() []float32

type FrameRateCalculatorForVP9Layer 

type FrameRateCalculatorForVP9Layer struct {
	*FrameRateCalculatorVP9
	// contains filtered or unexported fields
}

func (*FrameRateCalculatorForVP9Layer) GetFrameRate 

func (f *FrameRateCalculatorForVP9Layer) GetFrameRate() []float32

type FrameRateCalculatorH26x 

type FrameRateCalculatorH26x struct {
	// contains filtered or unexported fields
}

func NewFrameRateCalculatorH26x 

func NewFrameRateCalculatorH26x(clockRate uint32, logger logger.Logger) *FrameRateCalculatorH26x

func (*FrameRateCalculatorH26x) Completed 

func (f *FrameRateCalculatorH26x) Completed() bool

func (*FrameRateCalculatorH26x) GetFrameRate 

func (f *FrameRateCalculatorH26x) GetFrameRate() []float32

func (*FrameRateCalculatorH26x) RecvPacket 

func (f *FrameRateCalculatorH26x) RecvPacket(ep *ExtPacket) bool

type FrameRateCalculatorVP8 

type FrameRateCalculatorVP8 struct {
	// contains filtered or unexported fields
}

FrameRateCalculator based on PictureID in VP8

func NewFrameRateCalculatorVP8 

func NewFrameRateCalculatorVP8(clockRate uint32, logger logger.Logger) *FrameRateCalculatorVP8

func (FrameRateCalculatorVP8) Completed 

func (f FrameRateCalculatorVP8) Completed() bool

func (FrameRateCalculatorVP8) GetFrameRate 

func (f FrameRateCalculatorVP8) GetFrameRate() []float32

func (*FrameRateCalculatorVP8) RecvPacket 

func (f *FrameRateCalculatorVP8) RecvPacket(ep *ExtPacket) bool

type FrameRateCalculatorVP9 

type FrameRateCalculatorVP9 struct {
	// contains filtered or unexported fields
}

FrameRateCalculator based on PictureID in VP9

func NewFrameRateCalculatorVP9 

func NewFrameRateCalculatorVP9(clockRate uint32, logger logger.Logger) *FrameRateCalculatorVP9

func (*FrameRateCalculatorVP9) Completed 

func (f *FrameRateCalculatorVP9) Completed() bool

func (*FrameRateCalculatorVP9) GetFrameRateCalculatorForSpatial 

func (f *FrameRateCalculatorVP9) GetFrameRateCalculatorForSpatial(spatial int32) *FrameRateCalculatorForVP9Layer

func (*FrameRateCalculatorVP9) GetFrameRateForSpatial 

func (f *FrameRateCalculatorVP9) GetFrameRateForSpatial(spatial int32) []float32

func (*FrameRateCalculatorVP9) RecvPacket 

func (f *FrameRateCalculatorVP9) RecvPacket(ep *ExtPacket) bool

type PacketHistory 

type PacketHistory struct {
	// contains filtered or unexported fields
}

func NewPacketHistory 

func NewPacketHistory(packetCount int) *PacketHistory

func (*PacketHistory) AddPacket 

func (ph *PacketHistory) AddPacket(extSeq uint64)

func (*PacketHistory) PacketsConsecutive 

func (ph *PacketHistory) PacketsConsecutive(start, end uint64) bool

type RTCPReader 

type RTCPReader struct {
	// contains filtered or unexported fields
}

func NewRTCPReader 

func NewRTCPReader(ssrc uint32) *RTCPReader

func (*RTCPReader) Close 

func (r *RTCPReader) Close() error

func (*RTCPReader) OnClose 

func (r *RTCPReader) OnClose(fn func())

func (*RTCPReader) OnPacket 

func (r *RTCPReader) OnPacket(f func([]byte))

func (*RTCPReader) Read 

func (r *RTCPReader) Read(_ []byte) (n int, err error)

func (*RTCPReader) Write 

func (r *RTCPReader) Write(p []byte) (n int, err error)

type StreamStatsWithLayers 

type StreamStatsWithLayers struct {
	RTPStats *rtpstats.RTPDeltaInfo
	Layers   map[int32]*rtpstats.RTPDeltaInfo

	RTPStatsRemoteView *rtpstats.RTPDeltaInfo
}

type VideoLayer 

type VideoLayer struct {
	Spatial  int32
	Temporal int32
}

func (VideoLayer) GreaterThan 

func (v VideoLayer) GreaterThan(v2 VideoLayer) bool

func (VideoLayer) IsValid 

func (v VideoLayer) IsValid() bool

func (VideoLayer) SpatialGreaterThanOrEqual 

func (v VideoLayer) SpatialGreaterThanOrEqual(v2 VideoLayer) bool

func (VideoLayer) String 

func (v VideoLayer) String() string

type VideoLayersRid 

type VideoLayersRid [DefaultMaxLayerSpatial + 1]string

func NormalizeVideoLayersRid 

func NormalizeVideoLayersRid(rids VideoLayersRid) VideoLayersRid

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