package core
import (
"bytes"
"context"
"fmt"
"io"
"net"
"net/http"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/aler9/gortsplib"
"github.com/aler9/gortsplib/pkg/ringbuffer"
"github.com/aler9/gortsplib/pkg/rtpaac"
"github.com/aler9/gortsplib/pkg/rtph264"
"github.com/pion/rtp"
"github.com/aler9/rtsp-simple-server/internal/conf"
"github.com/aler9/rtsp-simple-server/internal/hls"
"github.com/aler9/rtsp-simple-server/internal/logger"
)
const (
closeCheckPeriod = 1 * time.Second
closeAfterInactivity = 60 * time.Second
)
const index = `
`
type hlsMuxerRequest struct {
Dir string
File string
Req *http.Request
W http.ResponseWriter
Res chan io.Reader
}
type hlsMuxerTrackIDPayloadPair struct {
trackID int
buf []byte
}
type hlsMuxerPathManager interface {
OnReaderSetupPlay(req pathReaderSetupPlayReq) pathReaderSetupPlayRes
}
type hlsMuxerParent interface {
Log(logger.Level, string, ...interface{})
OnMuxerClose(*hlsMuxer)
}
type hlsMuxer struct {
hlsAlwaysRemux bool
hlsSegmentCount int
hlsSegmentDuration conf.StringDuration
readBufferCount int
wg *sync.WaitGroup
pathName string
pathManager hlsMuxerPathManager
parent hlsMuxerParent
ctx context.Context
ctxCancel func()
path *path
ringBuffer *ringbuffer.RingBuffer
lastRequestTime *int64
muxer *hls.Muxer
requests []hlsMuxerRequest
// in
request chan hlsMuxerRequest
}
func newHLSMuxer(
parentCtx context.Context,
hlsAlwaysRemux bool,
hlsSegmentCount int,
hlsSegmentDuration conf.StringDuration,
readBufferCount int,
wg *sync.WaitGroup,
pathName string,
pathManager hlsMuxerPathManager,
parent hlsMuxerParent) *hlsMuxer {
ctx, ctxCancel := context.WithCancel(parentCtx)
r := &hlsMuxer{
hlsAlwaysRemux: hlsAlwaysRemux,
hlsSegmentCount: hlsSegmentCount,
hlsSegmentDuration: hlsSegmentDuration,
readBufferCount: readBufferCount,
wg: wg,
pathName: pathName,
pathManager: pathManager,
parent: parent,
ctx: ctx,
ctxCancel: ctxCancel,
lastRequestTime: func() *int64 {
v := time.Now().Unix()
return &v
}(),
request: make(chan hlsMuxerRequest),
}
r.log(logger.Info, "created")
r.wg.Add(1)
go r.run()
return r
}
func (r *hlsMuxer) Close() {
r.ctxCancel()
}
func (r *hlsMuxer) log(level logger.Level, format string, args ...interface{}) {
r.parent.Log(level, "[muxer %s] "+format, append([]interface{}{r.pathName}, args...)...)
}
// PathName returns the path name.
func (r *hlsMuxer) PathName() string {
return r.pathName
}
func (r *hlsMuxer) run() {
defer r.wg.Done()
defer r.log(logger.Info, "destroyed")
innerCtx, innerCtxCancel := context.WithCancel(context.Background())
innerReady := make(chan struct{})
innerErr := make(chan error)
go func() {
innerErr <- r.runInner(innerCtx, innerReady)
}()
isReady := false
outer:
for {
select {
case <-r.ctx.Done():
innerCtxCancel()
<-innerErr
break outer
case req := <-r.request:
if isReady {
r.handleRequest(req)
} else {
r.requests = append(r.requests, req)
}
case <-innerReady:
isReady = true
for _, req := range r.requests {
r.handleRequest(req)
}
r.requests = nil
case err := <-innerErr:
innerCtxCancel()
if err != nil {
r.log(logger.Info, "ERR: %s", err)
}
break outer
}
}
r.ctxCancel()
for _, req := range r.requests {
req.W.WriteHeader(http.StatusNotFound)
req.Res <- nil
}
r.parent.OnMuxerClose(r)
}
func (r *hlsMuxer) runInner(innerCtx context.Context, innerReady chan struct{}) error {
res := r.pathManager.OnReaderSetupPlay(pathReaderSetupPlayReq{
Author: r,
PathName: r.pathName,
IP: nil,
ValidateCredentials: nil,
})
if res.Err != nil {
return res.Err
}
r.path = res.Path
defer func() {
r.path.OnReaderRemove(pathReaderRemoveReq{Author: r})
}()
var videoTrack *gortsplib.Track
videoTrackID := -1
var h264Decoder *rtph264.Decoder
var audioTrack *gortsplib.Track
audioTrackID := -1
var aacDecoder *rtpaac.Decoder
for i, t := range res.Stream.tracks() {
if t.IsH264() {
if videoTrack != nil {
return fmt.Errorf("can't read track %d with HLS: too many tracks", i+1)
}
videoTrack = t
videoTrackID = i
h264Decoder = rtph264.NewDecoder()
} else if t.IsAAC() {
if audioTrack != nil {
return fmt.Errorf("can't read track %d with HLS: too many tracks", i+1)
}
audioTrack = t
audioTrackID = i
conf, err := t.ExtractConfigAAC()
if err != nil {
return err
}
aacDecoder = rtpaac.NewDecoder(conf.SampleRate)
}
}
if videoTrack == nil && audioTrack == nil {
return fmt.Errorf("the stream doesn't contain an H264 track or an AAC track")
}
var err error
r.muxer, err = hls.NewMuxer(
r.hlsSegmentCount,
time.Duration(r.hlsSegmentDuration),
videoTrack,
audioTrack,
)
if err != nil {
return err
}
defer r.muxer.Close()
innerReady <- struct{}{}
r.ringBuffer = ringbuffer.New(uint64(r.readBufferCount))
r.path.OnReaderPlay(pathReaderPlayReq{Author: r})
writerDone := make(chan error)
go func() {
writerDone <- func() error {
var videoBuf [][]byte
for {
data, ok := r.ringBuffer.Pull()
if !ok {
return fmt.Errorf("terminated")
}
pair := data.(hlsMuxerTrackIDPayloadPair)
if videoTrack != nil && pair.trackID == videoTrackID {
var pkt rtp.Packet
err := pkt.Unmarshal(pair.buf)
if err != nil {
r.log(logger.Warn, "unable to decode RTP packet: %v", err)
continue
}
nalus, pts, err := h264Decoder.DecodeRTP(&pkt)
if err != nil {
if err != rtph264.ErrMorePacketsNeeded && err != rtph264.ErrNonStartingPacketAndNoPrevious {
r.log(logger.Warn, "unable to decode video track: %v", err)
}
continue
}
videoBuf = append(videoBuf, nalus...)
// RTP marker means that all the NALUs with the same PTS have been received.
// send them together.
if pkt.Marker {
err := r.muxer.WriteH264(pts, videoBuf)
if err != nil {
return err
}
videoBuf = nil
}
} else if audioTrack != nil && pair.trackID == audioTrackID {
var pkt rtp.Packet
err := pkt.Unmarshal(pair.buf)
if err != nil {
r.log(logger.Warn, "unable to decode RTP packet: %v", err)
continue
}
aus, pts, err := aacDecoder.DecodeRTP(&pkt)
if err != nil {
if err != rtpaac.ErrMorePacketsNeeded {
r.log(logger.Warn, "unable to decode audio track: %v", err)
}
continue
}
err = r.muxer.WriteAAC(pts, aus)
if err != nil {
return err
}
}
}
}()
}()
closeCheckTicker := time.NewTicker(closeCheckPeriod)
defer closeCheckTicker.Stop()
for {
select {
case <-closeCheckTicker.C:
t := time.Unix(atomic.LoadInt64(r.lastRequestTime), 0)
if !r.hlsAlwaysRemux && time.Since(t) >= closeAfterInactivity {
r.ringBuffer.Close()
<-writerDone
return nil
}
case err := <-writerDone:
return err
case <-innerCtx.Done():
r.ringBuffer.Close()
<-writerDone
return nil
}
}
}
func (r *hlsMuxer) handleRequest(req hlsMuxerRequest) {
atomic.StoreInt64(r.lastRequestTime, time.Now().Unix())
conf := r.path.Conf()
if conf.ReadIPs != nil {
tmp, _, _ := net.SplitHostPort(req.Req.RemoteAddr)
ip := net.ParseIP(tmp)
if !ipEqualOrInRange(ip, conf.ReadIPs) {
r.log(logger.Info, "ERR: ip '%s' not allowed", ip)
req.W.WriteHeader(http.StatusUnauthorized)
req.Res <- nil
return
}
}
if conf.ReadUser != "" {
user, pass, ok := req.Req.BasicAuth()
if !ok || user != conf.ReadUser || pass != conf.ReadPass {
req.W.Header().Set("WWW-Authenticate", `Basic realm="rtsp-simple-server"`)
req.W.WriteHeader(http.StatusUnauthorized)
req.Res <- nil
return
}
}
switch {
case req.File == "index.m3u8":
req.W.Header().Set("Content-Type", `application/x-mpegURL`)
req.Res <- r.muxer.PrimaryPlaylist()
case req.File == "stream.m3u8":
req.W.Header().Set("Content-Type", `application/x-mpegURL`)
req.Res <- r.muxer.StreamPlaylist()
case strings.HasSuffix(req.File, ".ts"):
r := r.muxer.Segment(req.File)
if r == nil {
req.W.WriteHeader(http.StatusNotFound)
req.Res <- nil
return
}
req.W.Header().Set("Content-Type", `video/MP2T`)
req.Res <- r
case req.File == "":
req.Res <- bytes.NewReader([]byte(index))
default:
req.W.WriteHeader(http.StatusNotFound)
req.Res <- nil
}
}
// OnRequest is called by hlsserver.Server (forwarded from ServeHTTP).
func (r *hlsMuxer) OnRequest(req hlsMuxerRequest) {
select {
case r.request <- req:
case <-r.ctx.Done():
req.W.WriteHeader(http.StatusNotFound)
req.Res <- nil
}
}
// OnReaderAccepted implements reader.
func (r *hlsMuxer) OnReaderAccepted() {
r.log(logger.Info, "is converting into HLS")
}
// OnReaderFrame implements reader.
func (r *hlsMuxer) OnReaderFrame(trackID int, streamType gortsplib.StreamType, payload []byte) {
if streamType == gortsplib.StreamTypeRTP {
r.ringBuffer.Push(hlsMuxerTrackIDPayloadPair{trackID, payload})
}
}
// OnReaderAPIDescribe implements reader.
func (r *hlsMuxer) OnReaderAPIDescribe() interface{} {
return struct {
Type string `json:"type"`
}{"hlsMuxer"}
}