dependencydescriptor

package
v1.4.0 Latest Latest
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 Go to latest Published: Mar 31, 2023 License: Apache-2.0 Imports: 6 Imported by: 0

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Index

Constants

View Source 
const (
	MaxSpatialIds    = 4
	MaxTemporalIds   = 8
	MaxDecodeTargets = 32
	MaxTemplates     = 64

	AllChainsAreActive = uint32(0)

	ExtensionUrl = "https://aomediacodec.github.io/av1-rtp-spec/#dependency-descriptor-rtp-header-extension"
)

Variables

This section is empty.

Functions

func SizeNonSymmetricBits 

func SizeNonSymmetricBits(val, numValues uint32) int

Types

type BitStreamReader 

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

func NewBitStreamReader 

func NewBitStreamReader(buf []byte) *BitStreamReader

func (*BitStreamReader) BytesRead added in v1.4.0 

func (b *BitStreamReader) BytesRead() int

func (*BitStreamReader) Invalidate 

func (b *BitStreamReader) Invalidate()

func (*BitStreamReader) Ok 

func (b *BitStreamReader) Ok() bool

func (*BitStreamReader) ReadBits 

func (b *BitStreamReader) ReadBits(bits int) (uint64, error)

Reads `bits` from the bitstream. `bits` must be in range [0, 64]. Returns an unsigned integer in range [0, 2^bits - 1]. On failure sets `BitstreamReader` into the failure state and returns 0.

func (*BitStreamReader) ReadBool 

func (b *BitStreamReader) ReadBool() (bool, error)

func (*BitStreamReader) ReadNonSymmetric 

func (b *BitStreamReader) ReadNonSymmetric(numValues uint32) (uint32, error)

Reads value in range [0, `num_values` - 1]. This encoding is similar to ReadBits(val, Ceil(Log2(num_values)), but reduces wastage incurred when encoding non-power of two value ranges Non symmetric values are encoded as: 1) n = bit_width(num_values) 2) k = (1 << n) - num_values Value v in range [0, k - 1] is encoded in (n-1) bits. Value v in range [k, num_values - 1] is encoded as (v+k) in n bits. https://aomediacodec.github.io/av1-spec/#nsn

func (*BitStreamReader) RemainingBits added in v1.4.0 

func (b *BitStreamReader) RemainingBits() int

type BitStreamWriter 

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

func NewBitStreamWriter 

func NewBitStreamWriter(buf []byte) *BitStreamWriter

func (*BitStreamWriter) RemainingBits 

func (w *BitStreamWriter) RemainingBits() int

func (*BitStreamWriter) WriteBits 

func (w *BitStreamWriter) WriteBits(val uint64, bitCount int) error

func (*BitStreamWriter) WriteNonSymmetric 

func (w *BitStreamWriter) WriteNonSymmetric(val, numValues uint32) error

type DecodeTargetIndication 

type DecodeTargetIndication int

Relationship of a frame to a Decode target. 

const (
	DecodeTargetNotPresent  DecodeTargetIndication = iota // DecodeTargetInfo symbol '-'
	DecodeTargetDiscardable                               // DecodeTargetInfo symbol 'D'
	DecodeTargetSwitch                                    // DecodeTargetInfo symbol 'S'
	DecodeTargetRequired                                  // DecodeTargetInfo symbol 'R'
)

func (DecodeTargetIndication) String 

func (i DecodeTargetIndication) String() string

type DependencyDescriptor 

type DependencyDescriptor struct {
	FirstPacketInFrame         bool // = true;
	LastPacketInFrame          bool // = true;
	FrameNumber                uint16
	FrameDependencies          *FrameDependencyTemplate
	Resolution                 *RenderResolution
	ActiveDecodeTargetsBitmask *uint32
	AttachedStructure          *FrameDependencyStructure
}

func (*DependencyDescriptor) MarshalSize 

func (d *DependencyDescriptor) MarshalSize() (int, error)

func (*DependencyDescriptor) MarshalSizeWithActiveChains 

func (d *DependencyDescriptor) MarshalSizeWithActiveChains(activeChains uint32) (int, error)

func (*DependencyDescriptor) String 

func (d *DependencyDescriptor) String() string

type DependencyDescriptorExtension 

type DependencyDescriptorExtension struct {
	Descriptor *DependencyDescriptor
	Structure  *FrameDependencyStructure
}

func (*DependencyDescriptorExtension) Marshal 

func (d *DependencyDescriptorExtension) Marshal() ([]byte, error)

func (*DependencyDescriptorExtension) MarshalWithActiveChains 

func (d *DependencyDescriptorExtension) MarshalWithActiveChains(activeChains uint32) ([]byte, error)

func (*DependencyDescriptorExtension) Unmarshal 

func (d *DependencyDescriptorExtension) Unmarshal(buf []byte) (int, error)

type DependencyDescriptorReader 

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

func NewDependencyDescriptorReader 

func NewDependencyDescriptorReader(buf []byte, structure *FrameDependencyStructure, descriptor *DependencyDescriptor) *DependencyDescriptorReader

func (*DependencyDescriptorReader) Parse 

func (r *DependencyDescriptorReader) Parse() (int, error)

type DependencyDescriptorWriter 

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

func NewDependencyDescriptorWriter 

func NewDependencyDescriptorWriter(buf []byte, structure *FrameDependencyStructure, activeChains uint32, descriptor *DependencyDescriptor) (*DependencyDescriptorWriter, error)

func (*DependencyDescriptorWriter) ResetBuf 

func (w *DependencyDescriptorWriter) ResetBuf(buf []byte)

func (*DependencyDescriptorWriter) ValueSizeBits 

func (w *DependencyDescriptorWriter) ValueSizeBits() int

func (*DependencyDescriptorWriter) Write 

func (w *DependencyDescriptorWriter) Write() error

type FrameDependencyStructure 

type FrameDependencyStructure struct {
	StructureId      int
	NumDecodeTargets int
	NumChains        int
	// If chains are used (num_chains > 0), maps decode target index into index of
	// the chain protecting that target.
	DecodeTargetProtectedByChain []int
	Resolutions                  []RenderResolution
	Templates                    []*FrameDependencyTemplate
}

func (*FrameDependencyStructure) String 

func (f *FrameDependencyStructure) String() string

type FrameDependencyTemplate 

type FrameDependencyTemplate struct {
	SpatialId               int
	TemporalId              int
	DecodeTargetIndications []DecodeTargetIndication
	FrameDiffs              []int
	ChainDiffs              []int
}

func (*FrameDependencyTemplate) Clone 

func (t *FrameDependencyTemplate) Clone() *FrameDependencyTemplate

type RenderResolution 

type RenderResolution struct {
	Width  int
	Height int
}

type TemplateMatch 

type TemplateMatch struct {
	TemplateIdx      int
	NeedCustomDtis   bool
	NeedCustomFdiffs bool
	NeedCustomChains bool
	// Size in bits to store frame-specific details, i.e.
	// excluding mandatory fields and template dependency structure.
	ExtraSizeBits int
}

Source Files

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