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pull.go
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pull.go
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package hls
import (
"compress/gzip"
"context"
"fmt"
"io"
"net/http"
"net/url"
"os"
"path/filepath"
"strings"
"sync"
"time"
"github.com/quangngotan95/go-m3u8/m3u8"
"go.uber.org/zap"
. "m7s.live/engine/v4"
"m7s.live/engine/v4/util"
)
// HLSPuller HLS拉流者
type HLSPuller struct {
TSPublisher
Puller
Video M3u8Info
Audio M3u8Info
TsHead http.Header `json:"-" yaml:"-"` //用于提供cookie等特殊身份的http头
SaveContext context.Context `json:"-" yaml:"-"` //用来保存ts文件到服务器
memoryTs util.Map[string, util.Recyclable]
}
// M3u8Info m3u8文件的信息,用于拉取m3u8文件,和提供查询
type M3u8Info struct {
Req *http.Request `json:"-" yaml:"-"`
M3U8Count int //一共拉取的m3u8文件数量
TSCount int //一共拉取的ts文件数量
LastM3u8 string //最后一个m3u8文件内容
}
type TSDownloader struct {
client *http.Client
url *url.URL
req *http.Request
res *http.Response
wg sync.WaitGroup
err error
dur float64
}
func (p *TSDownloader) Start() {
p.wg.Add(1)
go func() {
defer p.wg.Done()
if tsRes, err := p.client.Do(p.req); err == nil {
p.res = tsRes
} else {
p.err = err
}
}()
}
func (p *HLSPuller) GetTs(key string) util.Recyclable {
return p.memoryTs.Get(key)
}
func readM3U8(res *http.Response) (playlist *m3u8.Playlist, err error) {
var reader io.Reader = res.Body
if res.Header.Get("Content-Encoding") == "gzip" {
reader, err = gzip.NewReader(reader)
}
if err == nil {
playlist, err = m3u8.Read(reader)
}
if err != nil {
HLSPlugin.Error("readM3U8", zap.Error(err))
}
return
}
func (p *HLSPuller) OnEvent(event any) {
switch event.(type) {
case IPublisher:
p.TSPublisher.OnEvent(event)
if hlsConfig.RelayMode != 0 {
p.Stream.NeverTimeout = true
memoryTs.Add(p.StreamPath, p)
}
case SEKick, SEclose:
if hlsConfig.RelayMode == 1 {
memoryTs.Delete(p.StreamPath)
}
p.Publisher.OnEvent(event)
default:
p.Publisher.OnEvent(event)
}
}
func (p *HLSPuller) pull(info *M3u8Info) (err error) {
//请求失败自动退出
req := info.Req.WithContext(p.Context)
client := http.DefaultClient
if p.Puller.Config.Proxy != "" {
URL, err := url.Parse(p.Puller.Config.Proxy)
if err != nil {
return err
}
client = &http.Client{
Transport: &http.Transport{
Proxy: http.ProxyURL(URL),
},
}
}
sequence := -1
lastTs := make(map[string]bool)
tsbuffer := make(chan io.ReadCloser)
bytesPool := make(util.BytesPool, 30)
tsRing := util.NewRing[string](6)
var tsReader *TSReader
if hlsConfig.RelayMode != 1 {
tsReader = NewTSReader(&p.TSPublisher)
defer tsReader.Close()
}
defer func() {
HLSPlugin.Info("hls exit", zap.String("streamPath", p.Stream.Path), zap.Error(err))
close(tsbuffer)
p.Stop()
}()
var maxResolution *m3u8.PlaylistItem
for errcount := 0; err == nil; err = p.Err() {
resp, err1 := client.Do(req)
if err1 != nil {
return err1
}
req = resp.Request
if playlist, err2 := readM3U8(resp); err2 == nil {
errcount = 0
info.LastM3u8 = playlist.String()
//if !playlist.Live {
// log.Println(p.LastM3u8)
// return
//}
if playlist.Sequence <= sequence {
HLSPlugin.Warn("same sequence", zap.Int("sequence", playlist.Sequence), zap.Int("max", sequence))
time.Sleep(time.Second)
continue
}
info.M3U8Count++
sequence = playlist.Sequence
thisTs := make(map[string]bool)
tsItems := make([]*m3u8.SegmentItem, 0)
discontinuity := false
for _, item := range playlist.Items {
switch v := item.(type) {
case *m3u8.PlaylistItem:
if (maxResolution == nil || maxResolution.Resolution != nil && (maxResolution.Resolution.Width < v.Resolution.Width || maxResolution.Resolution.Height < v.Resolution.Height)) || maxResolution.Bandwidth < v.Bandwidth {
maxResolution = v
}
case *m3u8.DiscontinuityItem:
discontinuity = true
case *m3u8.SegmentItem:
thisTs[v.Segment] = true
if _, ok := lastTs[v.Segment]; ok && !discontinuity {
continue
}
tsItems = append(tsItems, v)
case *m3u8.MediaItem:
if p.Audio.Req == nil {
if url, err := req.URL.Parse(*v.URI); err == nil {
newReq, _ := http.NewRequest("GET", url.String(), nil)
newReq.Header = req.Header
p.Audio.Req = newReq
go p.pull(&p.Audio)
}
}
}
}
if maxResolution != nil && len(tsItems) == 0 {
if url, err := req.URL.Parse(maxResolution.URI); err == nil {
if strings.HasSuffix(url.Path, ".m3u8") {
p.Video.Req, _ = http.NewRequest("GET", url.String(), nil)
p.Video.Req.Header = req.Header
req = p.Video.Req
continue
}
}
}
tsCount := len(tsItems)
HLSPlugin.Debug("readM3U8", zap.Int("sequence", sequence), zap.Int("tscount", tsCount))
lastTs = thisTs
if tsCount > 3 {
tsItems = tsItems[tsCount-3:]
}
var plBuffer util.Buffer
relayPlayList := Playlist{
Writer: &plBuffer,
Targetduration: playlist.Target,
Sequence: playlist.Sequence,
}
if hlsConfig.RelayMode != 0 {
relayPlayList.Init()
}
var tsDownloaders = make([]*TSDownloader, len(tsItems))
for i, v := range tsItems {
if p.Err() != nil {
return p.Err()
}
tsUrl, _ := info.Req.URL.Parse(v.Segment)
tsReq, _ := http.NewRequestWithContext(p.Context, "GET", tsUrl.String(), nil)
tsReq.Header = p.TsHead
// t1 := time.Now()
tsDownloaders[i] = &TSDownloader{
client: client,
req: tsReq,
url: tsUrl,
dur: v.Duration,
}
tsDownloaders[i].Start()
}
ts := time.Now().UnixMilli()
for i, v := range tsDownloaders {
HLSPlugin.Debug("start download ts", zap.String("tsUrl", v.url.String()))
v.wg.Wait()
if v.res != nil {
info.TSCount++
p.SetIO(v.res.Body)
if p.SaveContext != nil && p.SaveContext.Err() == nil {
os.MkdirAll(filepath.Join(hlsConfig.Path, p.Stream.Path), 0766)
if f, err := os.OpenFile(filepath.Join(hlsConfig.Path, p.Stream.Path, filepath.Base(v.url.Path)), os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0666); err == nil {
p.SetIO(io.TeeReader(v.res.Body, f))
p.Closer = f
}
}
var tsBytes *util.Buffer
var item *util.ListItem[util.Buffer]
// 包含转发
if hlsConfig.RelayMode != 0 {
if v.res.ContentLength < 0 {
item = bytesPool.GetShell(make([]byte, 0))
} else {
item = bytesPool.Get(int(v.res.ContentLength))
item.Value = item.Value[:0]
}
tsBytes = &item.Value
}
switch hlsConfig.RelayMode {
case 1:
io.Copy(tsBytes, p.Reader)
case 2:
p.SetIO(io.TeeReader(p.Reader, tsBytes))
fallthrough
case 0:
tsReader.Feed(p)
}
if hlsConfig.RelayMode != 0 {
tsFilename := fmt.Sprintf("%d_%d.ts", ts, i)
tsFilePath := p.StreamPath + "/" + tsFilename
var plInfo = PlaylistInf{
Title: p.Stream.StreamName + "/" + tsFilename,
Duration: v.dur,
FilePath: tsFilePath,
}
relayPlayList.WriteInf(plInfo)
p.memoryTs.Add(tsFilePath, item)
next := tsRing.Next()
if next.Value != "" {
item, _ := p.memoryTs.Delete(next.Value)
if item == nil {
p.Warn("memoryTs delete nil", zap.String("tsFilePath", next.Value))
} else {
item.Recycle()
}
}
next.Value = tsFilePath
tsRing = next
}
p.Close()
} else if v.err != nil {
HLSPlugin.Error("reqTs", zap.String("streamPath", p.Stream.Path), zap.Error(v.err))
} else {
HLSPlugin.Error("reqTs", zap.String("streamPath", p.Stream.Path))
}
HLSPlugin.Debug("finish download ts", zap.String("tsUrl", v.url.String()))
}
if hlsConfig.RelayMode != 0 {
m3u8 := string(plBuffer)
HLSPlugin.Debug("write m3u8", zap.String("streamPath", p.Stream.Path), zap.String("m3u8", m3u8))
memoryM3u8.Store(p.Stream.Path, m3u8)
}
} else {
HLSPlugin.Error("readM3u8", zap.String("streamPath", p.Stream.Path), zap.Error(err2))
errcount++
if errcount > 10 {
return err2
}
}
}
return
}
func (p *HLSPuller) Connect() (err error) {
p.Video.Req, err = http.NewRequest("GET", p.RemoteURL, nil)
return
}
func (p *HLSPuller) Disconnect() {
p.Stop(zap.String("reason", "disconnect"))
}
func (p *HLSPuller) Pull() error {
return p.pull(&p.Video)
}