h264

README

H264

Payloader code taken from pion library. And changed to AVC packets support.

Useful Links

• RTP Payload Format for H.264 Video
• The H264 Sequence parameter set
• H.264 Video Types (Microsoft)
• Automatic Generation of H.264 Parameter Sets to Recover Video File Fragments
• Chromium sources
• AVC levels
• AVC profiles table
• Supported Media for Google Cast
• Two stream formats, Annex-B, AVCC (H.264) and HVCC (H.265)

Documentation

Index

• Constants
• func AnnexB2AVC(b []byte) []byte
• func DecodeAnnexB(b []byte) []byte
• func DecodeStream(annexb []byte) ([]byte, int)
• func EmitNalus(nals []byte, isAVC bool, emit func([]byte))
• func EncodeAVC(nals ...[]byte) (avc []byte)
• func GetFmtpLine(avc []byte) string
• func GetParameterSet(fmtp string) (sps, pps []byte)
• func GetProfileLevelID(fmtp string) string
• func IndexFrom(b []byte, sep []byte, from int) int
• func IsKeyframe(b []byte) bool
• func Join(ps, iframe []byte) []byte
• func NALUType(b []byte) byte
• func RTPDepay(codec *core.Codec, handler core.HandlerFunc) core.HandlerFunc
• func RTPPay(mtu uint16, handler core.HandlerFunc) core.HandlerFunc
• func RepairAVC(codec *core.Codec, handler core.HandlerFunc) core.HandlerFunc
• func SplitAVC(data []byte) [][]byte
• func Types(data []byte) []byte
• type Payloader
  • func (p *Payloader) Payload(mtu uint16, payload []byte) [][]byte

Constants

const (
	NALUTypePFrame = 1 // Coded slice of a non-IDR picture
	NALUTypeIFrame = 5 // Coded slice of an IDR picture
	NALUTypeSEI    = 6 // Supplemental enhancement information (SEI)
	NALUTypeSPS    = 7 // Sequence parameter set
	NALUTypePPS    = 8 // Picture parameter set
	NALUTypeAUD    = 9 // Access unit delimiter
)

const PSMaxSize = 128 // the biggest SPS I've seen is 48 (EZVIZ CS-CV210)

const RTPPacketVersionAVC = 0

Functions

func AnnexB2AVC

func AnnexB2AVC(b []byte) []byte

func DecodeAnnexB

func DecodeAnnexB(b []byte) []byte

DecodeAnnexB - convert AnnexB to AVC format support unknown separator size

func DecodeStream

func DecodeStream(annexb []byte) ([]byte, int)

DecodeStream - find and return first AU in AVC format useful for processing live streams with unknown separator size

func EmitNalus

func EmitNalus(nals []byte, isAVC bool, emit func([]byte))

func EncodeAVC

func EncodeAVC(nals ...[]byte) (avc []byte)

func GetFmtpLine

func GetFmtpLine(avc []byte) string

GetFmtpLine from SPS+PPS+IFrame in AVC format

func GetParameterSet

func GetParameterSet(fmtp string) (sps, pps []byte)

func GetProfileLevelID

func GetProfileLevelID(fmtp string) string

GetProfileLevelID - get profile from fmtp line Some devices won't play video with high level, so limit max profile and max level. And return some profile even if fmtp line is empty.

func IndexFrom

func IndexFrom(b []byte, sep []byte, from int) int

func IsKeyframe

func IsKeyframe(b []byte) bool

IsKeyframe - check if any NALU in one AU is Keyframe

func Join

func Join(ps, iframe []byte) []byte

func NALUType

func NALUType(b []byte) byte

func RTPDepay

func RTPDepay(codec *core.Codec, handler core.HandlerFunc) core.HandlerFunc

func RTPPay

func RTPPay(mtu uint16, handler core.HandlerFunc) core.HandlerFunc

func RepairAVC

func RepairAVC(codec *core.Codec, handler core.HandlerFunc) core.HandlerFunc

func SplitAVC

func SplitAVC(data []byte) [][]byte

func Types

func Types(data []byte) []byte

Types

type Payloader

type Payloader struct {
	IsAVC bool
	// contains filtered or unexported fields
}

Payloader payloads H264 packets

func (*Payloader) Payload

func (p *Payloader) Payload(mtu uint16, payload []byte) [][]byte

Payload fragments a H264 packet across one or more byte arrays