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h264.go
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h264.go
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package track
import (
"bytes"
"time"
"go.uber.org/zap"
"m7s.live/engine/v4/codec"
. "m7s.live/engine/v4/common"
"m7s.live/engine/v4/log"
"m7s.live/engine/v4/util"
)
var _ SpesificTrack = (*H264)(nil)
type H264 struct {
Video
buf util.Buffer // rtp 包临时缓存,对于不规范的 rtp 包(sps 放到了 fua 中导致)需要缓存
}
func NewH264(puber IPuber, stuff ...any) (vt *H264) {
vt = &H264{}
vt.Video.CodecID = codec.CodecID_H264
vt.SetStuff("h264", byte(96), uint32(90000), vt, stuff, puber)
if vt.BytesPool == nil {
vt.BytesPool = make(util.BytesPool, 17)
}
vt.ParamaterSets = make(ParamaterSets, 2)
vt.nalulenSize = 4
vt.dtsEst = util.NewDTSEstimator()
return
}
func (vt *H264) WriteSliceBytes(slice []byte) {
if len(slice) > 4 && bytes.Equal(slice[:4], codec.NALU_Delimiter2) {
slice = slice[4:] // 有些设备厂商不规范,所以需要移除前导的 00 00 00 01
}
if len(slice) == 0 {
vt.Error("H264 WriteSliceBytes got empty slice")
return
}
naluType := codec.ParseH264NALUType(slice[0])
if log.Trace {
vt.Trace("naluType", zap.Uint8("naluType", naluType.Byte()))
}
switch naluType {
case codec.NALU_SPS:
spsInfo, _ := codec.ParseSPS(slice)
if spsInfo.Width != vt.SPSInfo.Width || spsInfo.Height != vt.SPSInfo.Height {
vt.Debug("SPS", zap.Any("SPSInfo", spsInfo))
}
vt.SPSInfo = spsInfo
vt.Video.SPS = slice
vt.ParamaterSets[0] = slice
case codec.NALU_PPS:
vt.Video.PPS = slice
vt.ParamaterSets[1] = slice
lenSPS := len(vt.Video.SPS)
lenPPS := len(vt.Video.PPS)
var b util.Buffer
if lenSPS > 3 {
b.Write(codec.RTMP_AVC_HEAD[:6])
b.Write(vt.Video.SPS[1:4])
b.Write(codec.RTMP_AVC_HEAD[9:10])
} else {
b.Write(codec.RTMP_AVC_HEAD)
}
b.WriteByte(0xE1)
b.WriteUint16(uint16(lenSPS))
b.Write(vt.Video.SPS)
b.WriteByte(0x01)
b.WriteUint16(uint16(lenPPS))
b.Write(vt.Video.PPS)
vt.WriteSequenceHead(b)
case codec.NALU_IDR_Picture:
vt.Value.IFrame = true
vt.AppendAuBytes(slice)
case codec.NALU_Non_IDR_Picture,
codec.NALU_Data_Partition_A,
codec.NALU_Data_Partition_B,
codec.NALU_Data_Partition_C:
vt.Value.IFrame = false
vt.AppendAuBytes(slice)
case codec.NALU_SEI:
vt.AppendAuBytes(slice)
case codec.NALU_Access_Unit_Delimiter:
case codec.NALU_Filler_Data:
default:
if vt.Value.IFrame {
vt.AppendAuBytes(slice)
return
}
vt.Error("nalu type not support", zap.Int("type", int(naluType)))
}
}
func (vt *H264) WriteSequenceHead(head []byte) (err error) {
var info codec.AVCDecoderConfigurationRecord
if _, err = info.Unmarshal(head[5:]); err == nil {
vt.SPSInfo, _ = codec.ParseSPS(info.SequenceParameterSetNALUnit)
vt.nalulenSize = int(info.LengthSizeMinusOne&3 + 1)
vt.SPS = info.SequenceParameterSetNALUnit
vt.PPS = info.PictureParameterSetNALUnit
vt.ParamaterSets[0] = vt.SPS
vt.ParamaterSets[1] = vt.PPS
vt.Video.WriteSequenceHead(head)
} else {
vt.Error("H264 ParseSpsPps Error")
vt.Publisher.Stop(zap.Error(err))
}
return
}
func (vt *H264) WriteRTPFrame(rtpItem *util.ListItem[RTPFrame]) {
defer func() {
err := recover()
if err != nil {
vt.Error("WriteRTPFrame panic", zap.Any("err", err))
vt.Publisher.Stop(zap.Any("err", err))
}
}()
if vt.lastSeq != vt.lastSeq2+1 && vt.lastSeq2 != 0 {
vt.lostFlag = true
vt.Warn("lost rtp packet", zap.Uint16("lastSeq", vt.lastSeq), zap.Uint16("lastSeq2", vt.lastSeq2))
}
frame := &rtpItem.Value
pts := frame.Timestamp
rv := vt.Value
// 有些流的 rtp 包中没有设置 marker 导致无法判断是否是最后一个包,此时通过时间戳变化判断,先 flush 之前的帧
if rv.PTS != time.Duration(pts) {
if rv.AUList.ByteLength > 0 {
if !vt.dcChanged && rv.IFrame {
vt.insertDCRtp()
}
vt.Flush()
rv = vt.Value
}
vt.generateTimestamp(pts)
}
rv.RTP.Push(rtpItem)
if naluType := frame.H264Type(); naluType < 24 {
vt.WriteSliceBytes(frame.Payload)
} else {
offset := naluType.Offset()
switch naluType {
case codec.NALU_STAPA, codec.NALU_STAPB:
if len(frame.Payload) <= offset {
vt.Error("invalid nalu size", zap.Int("naluType", int(naluType)))
return
}
for buffer := util.Buffer(frame.Payload[offset:]); buffer.CanRead(); {
nextSize := int(buffer.ReadUint16())
if buffer.Len() >= nextSize {
vt.WriteSliceBytes(buffer.ReadN(nextSize))
} else {
vt.Error("invalid nalu size", zap.Int("naluType", int(naluType)))
return
}
}
case codec.NALU_FUA, codec.NALU_FUB:
b1 := frame.Payload[1]
if util.Bit1(b1, 0) {
naluType = naluType.Parse(b1)
firstByte := naluType.Or(frame.Payload[0] & 0x60)
switch naluType {
case codec.NALU_SPS, codec.NALU_PPS:
vt.buf.WriteByte(firstByte)
default:
vt.WriteSliceByte(firstByte)
}
}
if vt.buf.Len() > 0 {
vt.buf.Write(frame.Payload[offset:])
} else {
if rv.AUList.Pre != nil && rv.AUList.Pre.Value != nil {
rv.AUList.Pre.Value.Push(vt.BytesPool.GetShell(frame.Payload[offset:]))
} else {
vt.Error("fu have no start")
return
}
}
if !util.Bit1(b1, 1) {
// fua 还没结束
return
} else if vt.buf.Len() > 0 {
vt.WriteAnnexB(uint32(rv.PTS), uint32(rv.DTS), vt.buf)
vt.buf = nil
}
}
}
if rv = vt.Value; frame.Marker && rv.AUList.ByteLength > 0 {
if !vt.dcChanged && rv.IFrame {
vt.insertDCRtp()
}
vt.Flush()
}
}
// RTP格式补完
func (vt *H264) CompleteRTP(value *AVFrame) {
var out [][][]byte
if value.IFrame {
out = append(out, [][]byte{vt.SPS}, [][]byte{vt.PPS})
}
vt.Value.AUList.Range(func(au *util.BLL) bool {
if au.ByteLength < RTPMTU {
out = append(out, au.ToBuffers())
} else {
startIndex := len(out)
var naluType codec.H264NALUType
r := au.NewReader()
b0, _ := r.ReadByte()
naluType = naluType.Parse(b0)
b0 = codec.NALU_FUA.Or(b0 & 0x60)
for bufs := r.ReadN(RTPMTU); len(bufs) > 0; bufs = r.ReadN(RTPMTU) {
out = append(out, append([][]byte{{b0, naluType.Byte()}}, bufs...))
}
out[startIndex][0][1] |= 1 << 7 // set start bit
out[len(out)-1][0][1] |= 1 << 6 // set end bit
}
return true
})
vt.PacketizeRTP(out...)
}
func (vt *H264) GetNALU_SEI() (item *util.ListItem[util.Buffer]) {
item = vt.BytesPool.Get(1)
item.Value[0] = byte(codec.NALU_SEI)
return
}