h264

README

H264

Access Unit (AU) can contain one or multiple NAL Unit:

1. [SEI,] SPS, PPS, IFrame, [IFrame...]
2. BFrame, [BFrame...]
3. IFrame, [IFrame...]

RTP H264

Camera	NALu
EZVIZ C3S	7f, 8f, 28:28:28 -> 5t, 28:28:28 -> 1t, 1t, 1t, 1t
Sonoff GK-200MP2-B	28:28:28 -> 5t, 1t, 1t, 1t
Dahua IPC-K42	7f, 8f, 28:28:28 -> 5t, 28:28:28 -> 1t, 28:28:28 -> 1t
FFmpeg copy	5t, 1t, 1t, 28:28:28 -> 1t, 28:28:28 -> 1t
FFmpeg h264	24 -> 6:5:5:5:5t, 24 -> 1:1:1:1t, 28:28:28 -> 5f, 28:28:28 -> 5f, 28:28:28 -> 5t
FFmpeg resize	6f, 28:28:28 -> 5f, 28... -> 5t, 24 -> 1:1f, 24 -> 1:1t

WebRTC

Video codec	Media string	Device
H.264/baseline!	avc1.42E0xx	Chromecast
H.264/baseline!	avc1.42E0xx	Chrome/Safari WebRTC
H.264/baseline!	avc1.42C0xx	FFmpeg ultrafast
H.264/baseline!	avc1.4240xx	Dahua H264B
H.264/baseline	avc1.4200xx	Chrome WebRTC
H.264/main!	avc1.4D40xx	Chromecast
H.264/main!	avc1.4D40xx	FFmpeg superfast main
H.264/main!	avc1.4D40xx	Dahua H264
H.264/main	avc1.4D00xx	Chrome WebRTC
H.264/high!	avc1.640Cxx	Safari WebRTC
H.264/high	avc1.6400xx	Chromecast
H.264/high	avc1.6400xx	FFmpeg superfast

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 EncodeAVC(nals ...[]byte) (avc []byte)
• func GetParameterSet(fmtp string) (sps, pps []byte)
• func GetProfileLevelID(fmtp string) string
• func IsKeyframe(b []byte) bool
• func Join(ps, iframe []byte) []byte
• func NALUType(b []byte) byte
• func RTPDepay(track *streamer.Track) streamer.WrapperFunc
• func RTPPay(mtu uint16) streamer.WrapperFunc
• func RepairAVC(track *streamer.Track) streamer.WrapperFunc
• 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 RTPPacketVersionAVC = 0

Functions

func EncodeAVC

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

func GetParameterSet

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

func GetProfileLevelID

func GetProfileLevelID(fmtp string) string

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(track *streamer.Track) streamer.WrapperFunc

func RTPPay

func RTPPay(mtu uint16) streamer.WrapperFunc

func RepairAVC

func RepairAVC(track *streamer.Track) streamer.WrapperFunc

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