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avcc.go
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avcc.go
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// Package h264 - AVCC format related functions
package h264
import (
"bytes"
"encoding/base64"
"encoding/binary"
"encoding/hex"
"github.com/AlexxIT/go2rtc/pkg/core"
"github.com/pion/rtp"
)
func RepairAVCC(codec *core.Codec, handler core.HandlerFunc) core.HandlerFunc {
sps, pps := GetParameterSet(codec.FmtpLine)
ps := JoinNALU(sps, pps)
return func(packet *rtp.Packet) {
if NALUType(packet.Payload) == NALUTypeIFrame {
packet.Payload = Join(ps, packet.Payload)
}
handler(packet)
}
}
func JoinNALU(nalus ...[]byte) (avcc []byte) {
var i, n int
for _, nalu := range nalus {
if i = len(nalu); i > 0 {
n += 4 + i
}
}
avcc = make([]byte, n)
n = 0
for _, nal := range nalus {
if i = len(nal); i > 0 {
binary.BigEndian.PutUint32(avcc[n:], uint32(i))
n += 4 + copy(avcc[n+4:], nal)
}
}
return
}
func SplitNALU(avcc []byte) [][]byte {
var nals [][]byte
for {
// get AVC length
size := int(binary.BigEndian.Uint32(avcc)) + 4
// check if multiple items in one packet
if size < len(avcc) {
nals = append(nals, avcc[:size])
avcc = avcc[size:]
} else {
nals = append(nals, avcc)
break
}
}
return nals
}
func NALUTypes(avcc []byte) []byte {
var types []byte
for {
types = append(types, NALUType(avcc))
size := 4 + int(binary.BigEndian.Uint32(avcc))
if size < len(avcc) {
avcc = avcc[size:]
} else {
break
}
}
return types
}
func AVCCToCodec(avcc []byte) *core.Codec {
buf := bytes.NewBufferString("packetization-mode=1")
for {
size := 4 + int(binary.BigEndian.Uint32(avcc))
switch NALUType(avcc) {
case NALUTypeSPS:
buf.WriteString(";profile-level-id=")
buf.WriteString(hex.EncodeToString(avcc[5:8]))
buf.WriteString(";sprop-parameter-sets=")
buf.WriteString(base64.StdEncoding.EncodeToString(avcc[4:size]))
case NALUTypePPS:
buf.WriteString(",")
buf.WriteString(base64.StdEncoding.EncodeToString(avcc[4:size]))
}
if size < len(avcc) {
avcc = avcc[size:]
} else {
break
}
}
return &core.Codec{
Name: core.CodecH264,
ClockRate: 90000,
FmtpLine: buf.String(),
PayloadType: core.PayloadTypeRAW,
}
}