avc

package

v0.11.1 Latest Latest Go to latest Published: Nov 13, 2020 License: MIT Imports: 8 Imported by: 0

Details

Valid go.mod file
Redistributable license
Tagged version
Stable version
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Repository

github.com/edgeware/mp4ff

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Documentation ¶

Index ¶

Constants
Variables
func HasParameterSets(b []byte) bool
type AVCDecConfRec
- func CreateAVCDecConfRec(spsNALU []byte, ppsNALUs [][]byte) AVCDecConfRec
- func DecodeAVCDecConfRec(r io.Reader) (AVCDecConfRec, error)
- func (a *AVCDecConfRec) Encode(w io.Writer) error
type CpbEntry
type HrdParameters
type NalType
- func FindNalTypes(b []byte) []NalType
- func GetNalType(nalHeader byte) NalType
- func (a NalType) String() string
type SPS
- func ParseSPSNALUnit(data []byte, parseVUIBeyondAspectRatio bool) (*SPS, error)
- func (a *SPS) ConstraintFlags() byte
type SeqScalingList
type SeqScalings
type SliceType
- func GetSliceTypeFromNAL(data []byte) (sliceType SliceType, err error)
- func (s SliceType) String() string
type VUIParameters

Constants ¶

View Source

const (
	// NALU_SEI - Supplementary Enhancement Information NAL Unit
	NALU_SEI = NalType(6)
	// NALU_SSP - SequenceParameterSet NAL Unit
	NALU_SPS = NalType(7)
	// NALU_PPS - PictureParameterSet NAL Unit
	NALU_PPS = NalType(8)
	// NALU_AUD - AccessUnitDelimiter NAL Unit
	NALU_AUD = NalType(9)
	// NALU_FILL - Filler NAL Unit
	NALU_FILL = NalType(12)
	// ExtendedSAR - Extended Sample Aspect Ratio Code
	ExtendedSAR = 255
)

View Source

const (
	SLICE_P  = SliceType(0)
	SLICE_B  = SliceType(1)
	SLICE_I  = SliceType(2)
	SLICE_SP = SliceType(3)
	SLICE_SI = SliceType(4)
)

Variables ¶

View Source

var ErrInvalidSliceType = errors.New("Invalid slice type")

View Source

var ErrNoSliceHeader = errors.New("No slice header")

View Source

var ErrNotSPS = errors.New("Not an SPS NAL unit")

View Source

var ErrTooFewBytesToParse = errors.New("Too few bytes to parse symbol")

Functions ¶

func HasParameterSets ¶

func HasParameterSets(b []byte) bool

HasParameterSets - Check if H.264 SPS and PPS are present

Types ¶

type AVCDecConfRec ¶

type AVCDecConfRec struct {
	AVCProfileIndication byte
	ProfileCompatibility byte
	AVCLevelIndication   byte
	SPSnalus             [][]byte
	PPSnalus             [][]byte
	ChromaFormat         byte
	BitDepthLumaMinus1   byte
	BitDepthChromaMinus1 byte
	NumSPSExt            byte
	NoTrailingInfo       bool // To handle strange cases where trailing info is missing
}

AVCDecConfRec - AVCDecoderConfigurationRecord

func CreateAVCDecConfRec ¶

func CreateAVCDecConfRec(spsNALU []byte, ppsNALUs [][]byte) AVCDecConfRec

CreateAVCDecConfRec - Create an AVCDecConfRec based on SPS and PPS

func DecodeAVCDecConfRec ¶

func DecodeAVCDecConfRec(r io.Reader) (AVCDecConfRec, error)

DecodeAVCDecConfRec - decode an AVCDecConfRec

func (*AVCDecConfRec) Encode ¶

func (a *AVCDecConfRec) Encode(w io.Writer) error

Encode - write an AVCDecConfRec to w

type CpbEntry ¶

type CpbEntry struct {
	BitRateValueMinus1 uint
	CpbSizeValueMinus1 uint
	CbrFlag            bool
}

CpbEntry inside HrdParameters

type HrdParameters ¶

type HrdParameters struct {
	CpbCountMinus1                     uint
	BitRateScale                       uint
	CpbSizeScale                       uint
	CpbEntries                         []CpbEntry
	InitialCpbRemovalDelayLengthMinus1 uint
	CpbRemovalDelayLengthMinus1        uint
	DpbOutpuDelayLengthMinus1          uint
	TimeOffsetLength                   uint
}

HrdParameters inside VUI

type NalType ¶

type NalType uint16

NalType - AVC nal type

func FindNalTypes ¶

func FindNalTypes(b []byte) []NalType

FindNalTypes - find list of nal types

func GetNalType ¶

func GetNalType(nalHeader byte) NalType

Get NalType from NAL Header byte

func (NalType) String ¶

func (a NalType) String() string

type SPS ¶

type SPS struct {
	Profile                         uint
	ProfileCompatibility            uint
	Level                           uint
	ParameterID                     uint
	ChromaFormatIDC                 uint
	SeparateColourPlaneFlag         bool
	BitDepthLumaMinus8              uint
	BitDepthChromaMinus8            uint
	QPPrimeYZeroTransformBypassFlag bool
	SeqScalingMatrixPresentFlag     bool
	SeqScalings                     *SeqScalings
	Log2MaxFrameNumMinus4           uint
	PicOrderCntType                 uint
	Log2MaxPicOrderCntLsbMinus4     uint
	DeltaPicOrderAlwaysZeroFlag     bool
	OffsetForNonRefPic              uint
	OffsetForTopToBottomField       uint
	RefFramesInPicOrderCntCycle     []uint
	NumRefFrames                    uint
	GapsInFrameNumValueAllowedFlag  bool
	FrameMbsOnlyFlag                bool
	MbAdaptiveFrameFieldFlag        bool
	Direct8x8InferenceFlag          bool
	FrameCroppingFlag               bool
	FrameCropLeftOffset             uint
	FrameCropRightOffset            uint
	FrameCropTopOffset              uint
	FrameCropBottomOffset           uint
	Width                           uint
	Height                          uint
	NrBytesBeforeVUI                int
	NrBytesRead                     int
	VUI                             *VUIParameters
}

SPS - AVC SPS parameters

func ParseSPSNALUnit ¶

func ParseSPSNALUnit(data []byte, parseVUIBeyondAspectRatio bool) (*SPS, error)

ParseSPSNALUnit - Parse AVC SPS NAL unit starting with NAL header

func (*SPS) ConstraintFlags ¶

func (a *SPS) ConstraintFlags() byte

ConstraintFlags - return the four ConstraintFlag bits

type SeqScalingList ¶

type SeqScalingList struct {
	SeqScalingListPresentFlag bool
	ScalingLists              []int
}

type SeqScalings ¶

type SeqScalings struct {
	SeqScalingLists []SeqScalingList
}

type SliceType ¶

type SliceType uint

func GetSliceTypeFromNAL ¶

func GetSliceTypeFromNAL(data []byte) (sliceType SliceType, err error)

GetSliceTypeFromNAL - parse slice header to get slice type in interval 0 to 4

func (SliceType) String ¶

func (s SliceType) String() string

type VUIParameters ¶

type VUIParameters struct {
	SampleAspectRatioWidth             uint
	SampleAspectRatioHeight            uint
	OverscanInfoPresentFlag            bool
	OverscanAppropriateFlag            bool
	VideoSignalTypePresentFlag         bool
	VideoFormat                        uint
	VideoFullRangeFlag                 bool
	ColourDescriptionFlag              bool
	ColourPrimaries                    uint
	TransferCharacteristics            uint
	MatrixCoefficients                 uint
	ChromaLocInfoPresentFlag           bool
	ChromaSampleLocTypeTopField        uint
	ChromaSampleLocTypeBottomField     uint
	TimingInfoPresentFlag              bool
	NumUnitsInTick                     uint
	TimeScale                          uint
	FixedFrameRateFlag                 bool
	NalHrdParametersPresentFlag        bool
	NalHrdParameters                   *HrdParameters
	VclHrdParametersPresentFlag        bool
	VclHrdParameters                   *HrdParameters
	LowDelayHrdFlag                    bool // Only present with HrdParameters
	PicStructPresentFlag               bool
	BitstreamRestrictionFlag           bool
	MotionVectorsOverPicBoundariesFlag bool
	MaxBytesPerPicDenom                uint
	MaxBitsPerMbDenom                  uint
	Log2MaxMvLengthHorizontal          uint
	Log2MaxMvLengthVertical            uint
	MaxNumReorderFrames                uint
	MaxDecFrameBuffering               uint
}

VUIParameters - extra parameters according to 14496-10, E.1

Source Files ¶

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