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frame.go
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frame.go
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package common
import (
"bytes"
"io"
"net"
"sync"
"sync/atomic"
"time"
"github.com/pion/rtp"
"m7s.live/engine/v4/codec"
"m7s.live/engine/v4/log"
"m7s.live/engine/v4/util"
)
func SplitAnnexB[T ~[]byte](frame T, process func(T), delimiter []byte) {
for after := frame; len(frame) > 0; frame = after {
if frame, after, _ = bytes.Cut(frame, delimiter); len(frame) > 0 {
process(frame)
}
}
}
type RTPFrame struct {
*rtp.Packet
Raw []byte
}
func (r *RTPFrame) H264Type() (naluType codec.H264NALUType) {
return naluType.Parse(r.Payload[0])
}
func (r *RTPFrame) H265Type() (naluType codec.H265NALUType) {
return naluType.Parse(r.Payload[0])
}
func (r *RTPFrame) Unmarshal(raw []byte) *RTPFrame {
if r.Packet == nil {
r.Packet = &rtp.Packet{}
}
if err := r.Packet.Unmarshal(raw); err != nil {
log.Error(err)
return nil
}
return r
}
type DataFrame[T any] struct {
DeltaTime uint32 // 相对上一帧时间戳,毫秒
WriteTime time.Time // 写入时间,可用于比较两个帧的先后
Sequence uint32 // 在一个Track中的序号
BytesIn int // 输入字节数用于计算BPS
CanRead bool `json:"-" yaml:"-"` // 是否可读取
readerCount atomic.Int32 `json:"-" yaml:"-"` // 读取者数量
Data T `json:"-" yaml:"-"`
sync.Cond `json:"-" yaml:"-"`
}
func NewDataFrame[T any]() *DataFrame[T] {
return &DataFrame[T]{}
}
func (df *DataFrame[T]) IsWriting() bool {
return !df.CanRead
}
func (df *DataFrame[T]) IsDiscarded() bool {
return df.L == nil
}
func (df *DataFrame[T]) Discard() int32 {
df.L = nil //标记为废弃
return df.readerCount.Load()
}
func (df *DataFrame[T]) SetSequence(sequence uint32) {
df.Sequence = sequence
}
func (df *DataFrame[T]) GetSequence() uint32 {
return df.Sequence
}
func (df *DataFrame[T]) ReaderEnter() int32 {
return df.readerCount.Add(1)
}
func (df *DataFrame[T]) ReaderCount() int32 {
return df.readerCount.Load()
}
func (df *DataFrame[T]) ReaderLeave() int32 {
return df.readerCount.Add(-1)
}
func (df *DataFrame[T]) StartWrite() bool {
if df.readerCount.Load() > 0 {
df.Discard() //标记为废弃
return false
} else {
df.CanRead = false //标记为正在写入
return true
}
}
func (df *DataFrame[T]) Ready() {
df.WriteTime = time.Now()
df.CanRead = true //标记为可读取
df.Broadcast()
}
func (df *DataFrame[T]) Init() {
df.L = util.EmptyLocker
}
func (df *DataFrame[T]) Reset() {
df.BytesIn = 0
df.DeltaTime = 0
}
type AVFrame struct {
DataFrame[any]
IFrame bool
PTS time.Duration
DTS time.Duration
Timestamp time.Duration // 绝对时间戳
ADTS *util.ListItem[util.Buffer] `json:"-" yaml:"-"` // ADTS头
AVCC util.BLL `json:"-" yaml:"-"` // 打包好的AVCC格式(MPEG-4格式、Byte-Stream Format)
RTP util.List[RTPFrame] `json:"-" yaml:"-"`
AUList util.BLLs `json:"-" yaml:"-"` // 裸数据
}
func NewAVFrame() *AVFrame {
return &AVFrame{}
}
func (av *AVFrame) WriteAVCC(ts uint32, frame *util.BLL) {
if ts == 0 {
ts = 1
}
av.Timestamp = time.Duration(ts) * time.Millisecond
av.BytesIn += frame.ByteLength
for {
item := frame.Shift()
if item == nil {
break
}
av.AVCC.Push(item)
}
// frame.Transfer(&av.AVCC)
// frame.ByteLength = 0
}
// Reset 重置数据,复用内存
func (av *AVFrame) Reset() {
av.RTP.Recycle()
av.AVCC.Recycle()
av.AUList.Recycle()
if av.ADTS != nil {
av.ADTS.Recycle()
av.ADTS = nil
}
av.Timestamp = 0
av.IFrame = false
av.DataFrame.Reset()
}
func (av *AVFrame) Assign(source *AVFrame) {
av.IFrame = source.IFrame
av.PTS = source.PTS
av.DTS = source.DTS
av.Timestamp = source.Timestamp
av.BytesIn = source.BytesIn
av.DeltaTime = source.DeltaTime
source.AUList.Range(func(au *util.BLL) bool {
var nau util.BLL
au.Range(func(b util.Buffer) bool {
nau.PushValue(b)
return true
})
nau.ByteLength = au.ByteLength
av.AUList.PushValue(&nau)
return true
})
}
type ParamaterSets [][]byte
func (v ParamaterSets) GetAnnexB() (r net.Buffers) {
for _, v := range v {
r = append(r, codec.NALU_Delimiter2, v)
}
return
}
func (v ParamaterSets) WriteAnnexBTo(w io.Writer) (n int, err error) {
var n1, n2 int
for _, v := range v {
if n1, err = w.Write(codec.NALU_Delimiter2); err != nil {
return
}
n += n1
if n2, err = w.Write(v); err != nil {
return
}
n += n2
}
return
}