package core
import (
"bytes"
"context"
"errors"
"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/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 hlsMuxerResponse struct {
status int
header map[string]string
body io.Reader
}
type hlsMuxerRequest struct {
dir string
file string
req *http.Request
res chan hlsMuxerResponse
}
type hlsMuxerPathManager interface {
onReaderSetupPlay(req pathReaderSetupPlayReq) pathReaderSetupPlayRes
}
type hlsMuxerParent interface {
log(logger.Level, string, ...interface{})
onMuxerClose(*hlsMuxer)
}
type hlsMuxer struct {
name string
externalAuthenticationURL string
hlsAlwaysRemux bool
hlsSegmentCount int
hlsSegmentDuration conf.StringDuration
hlsSegmentMaxSize conf.StringSize
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
hlsServerAPIMuxersList chan hlsServerAPIMuxersListSubReq
}
func newHLSMuxer(
parentCtx context.Context,
name string,
externalAuthenticationURL string,
hlsAlwaysRemux bool,
hlsSegmentCount int,
hlsSegmentDuration conf.StringDuration,
hlsSegmentMaxSize conf.StringSize,
readBufferCount int,
wg *sync.WaitGroup,
pathName string,
pathManager hlsMuxerPathManager,
parent hlsMuxerParent,
) *hlsMuxer {
ctx, ctxCancel := context.WithCancel(parentCtx)
m := &hlsMuxer{
name: name,
externalAuthenticationURL: externalAuthenticationURL,
hlsAlwaysRemux: hlsAlwaysRemux,
hlsSegmentCount: hlsSegmentCount,
hlsSegmentDuration: hlsSegmentDuration,
hlsSegmentMaxSize: hlsSegmentMaxSize,
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),
hlsServerAPIMuxersList: make(chan hlsServerAPIMuxersListSubReq),
}
m.log(logger.Info, "created")
m.wg.Add(1)
go m.run()
return m
}
func (m *hlsMuxer) close() {
m.ctxCancel()
}
func (m *hlsMuxer) log(level logger.Level, format string, args ...interface{}) {
m.parent.log(level, "[muxer %s] "+format, append([]interface{}{m.pathName}, args...)...)
}
// PathName returns the path name.
func (m *hlsMuxer) PathName() string {
return m.pathName
}
func (m *hlsMuxer) run() {
defer m.wg.Done()
innerCtx, innerCtxCancel := context.WithCancel(context.Background())
innerReady := make(chan struct{})
innerErr := make(chan error)
go func() {
innerErr <- m.runInner(innerCtx, innerReady)
}()
isReady := false
err := func() error {
for {
select {
case <-m.ctx.Done():
innerCtxCancel()
<-innerErr
return errors.New("terminated")
case req := <-m.request:
if isReady {
req.res <- m.handleRequest(req)
} else {
m.requests = append(m.requests, req)
}
case req := <-m.hlsServerAPIMuxersList:
req.data.Items[m.name] = hlsServerAPIMuxersListItem{
LastRequest: time.Unix(atomic.LoadInt64(m.lastRequestTime), 0).String(),
}
close(req.res)
case <-innerReady:
isReady = true
for _, req := range m.requests {
req.res <- m.handleRequest(req)
}
m.requests = nil
case err := <-innerErr:
innerCtxCancel()
return err
}
}
}()
m.ctxCancel()
for _, req := range m.requests {
req.res <- hlsMuxerResponse{status: http.StatusNotFound}
}
m.parent.onMuxerClose(m)
m.log(logger.Info, "destroyed (%v)", err)
}
func (m *hlsMuxer) runInner(innerCtx context.Context, innerReady chan struct{}) error {
res := m.pathManager.onReaderSetupPlay(pathReaderSetupPlayReq{
author: m,
pathName: m.pathName,
authenticate: nil,
})
if res.err != nil {
return res.err
}
m.path = res.path
defer func() {
m.path.onReaderRemove(pathReaderRemoveReq{author: m})
}()
var videoTrack *gortsplib.TrackH264
videoTrackID := -1
var audioTrack *gortsplib.TrackAAC
audioTrackID := -1
var aacDecoder *rtpaac.Decoder
for i, track := range res.stream.tracks() {
switch tt := track.(type) {
case *gortsplib.TrackH264:
if videoTrack != nil {
return fmt.Errorf("can't encode track %d with HLS: too many tracks", i+1)
}
videoTrack = tt
videoTrackID = i
case *gortsplib.TrackAAC:
if audioTrack != nil {
return fmt.Errorf("can't encode track %d with HLS: too many tracks", i+1)
}
audioTrack = tt
audioTrackID = i
aacDecoder = &rtpaac.Decoder{
SampleRate: tt.ClockRate(),
SizeLength: tt.SizeLength(),
IndexLength: tt.IndexLength(),
IndexDeltaLength: tt.IndexDeltaLength(),
}
aacDecoder.Init()
}
}
if videoTrack == nil && audioTrack == nil {
return fmt.Errorf("the stream doesn't contain an H264 track or an AAC track")
}
var err error
m.muxer, err = hls.NewMuxer(
m.hlsSegmentCount,
time.Duration(m.hlsSegmentDuration),
uint64(m.hlsSegmentMaxSize),
videoTrack,
audioTrack,
)
if err != nil {
return err
}
defer m.muxer.Close()
innerReady <- struct{}{}
m.ringBuffer = ringbuffer.New(uint64(m.readBufferCount))
m.path.onReaderPlay(pathReaderPlayReq{author: m})
writerDone := make(chan error)
go func() {
writerDone <- func() error {
var videoInitialPTS *time.Duration
for {
item, ok := m.ringBuffer.Pull()
if !ok {
return fmt.Errorf("terminated")
}
data := item.(*data)
if videoTrack != nil && data.trackID == videoTrackID {
if data.h264NALUs == nil {
continue
}
// video is decoded in another routine,
// while audio is decoded in this routine:
// we have to sync their PTS.
if videoInitialPTS == nil {
v := data.h264PTS
videoInitialPTS = &v
}
pts := data.h264PTS - *videoInitialPTS
err = m.muxer.WriteH264(pts, data.h264NALUs)
if err != nil {
m.log(logger.Warn, "unable to write segment: %v", err)
continue
}
} else if audioTrack != nil && data.trackID == audioTrackID {
aus, pts, err := aacDecoder.Decode(data.rtp)
if err != nil {
if err != rtpaac.ErrMorePacketsNeeded {
m.log(logger.Warn, "unable to decode audio track: %v", err)
}
continue
}
err = m.muxer.WriteAAC(pts, aus)
if err != nil {
m.log(logger.Warn, "unable to write segment: %v", err)
continue
}
}
}
}()
}()
closeCheckTicker := time.NewTicker(closeCheckPeriod)
defer closeCheckTicker.Stop()
for {
select {
case <-closeCheckTicker.C:
t := time.Unix(atomic.LoadInt64(m.lastRequestTime), 0)
if !m.hlsAlwaysRemux && time.Since(t) >= closeAfterInactivity {
m.ringBuffer.Close()
<-writerDone
return fmt.Errorf("not used anymore")
}
case err := <-writerDone:
return err
case <-innerCtx.Done():
m.ringBuffer.Close()
<-writerDone
return fmt.Errorf("terminated")
}
}
}
func (m *hlsMuxer) handleRequest(req hlsMuxerRequest) hlsMuxerResponse {
atomic.StoreInt64(m.lastRequestTime, time.Now().Unix())
err := m.authenticate(req.req)
if err != nil {
if terr, ok := err.(pathErrAuthCritical); ok {
m.log(logger.Info, "authentication error: %s", terr.message)
return hlsMuxerResponse{
status: http.StatusUnauthorized,
}
}
return hlsMuxerResponse{
status: http.StatusUnauthorized,
header: map[string]string{
"WWW-Authenticate": `Basic realm="rtsp-simple-server"`,
},
}
}
switch {
case req.file == "index.m3u8":
return hlsMuxerResponse{
status: http.StatusOK,
header: map[string]string{
"Content-Type": `application/x-mpegURL`,
},
body: m.muxer.PrimaryPlaylist(),
}
case req.file == "stream.m3u8":
return hlsMuxerResponse{
status: http.StatusOK,
header: map[string]string{
"Content-Type": `application/x-mpegURL`,
},
body: m.muxer.StreamPlaylist(),
}
case strings.HasSuffix(req.file, ".ts"):
r := m.muxer.Segment(req.file)
if r == nil {
return hlsMuxerResponse{status: http.StatusNotFound}
}
return hlsMuxerResponse{
status: http.StatusOK,
header: map[string]string{
"Content-Type": `video/MP2T`,
},
body: r,
}
case req.file == "":
return hlsMuxerResponse{
status: http.StatusOK,
header: map[string]string{
"Content-Type": `text/html`,
},
body: bytes.NewReader([]byte(index)),
}
default:
return hlsMuxerResponse{status: http.StatusNotFound}
}
}
func (m *hlsMuxer) authenticate(req *http.Request) error {
pathConf := m.path.Conf()
pathIPs := pathConf.ReadIPs
pathUser := pathConf.ReadUser
pathPass := pathConf.ReadPass
if m.externalAuthenticationURL != "" {
tmp, _, _ := net.SplitHostPort(req.RemoteAddr)
ip := net.ParseIP(tmp)
user, pass, _ := req.BasicAuth()
err := externalAuth(
m.externalAuthenticationURL,
ip.String(),
user,
pass,
m.pathName,
"read",
req.URL.RawQuery)
if err != nil {
return pathErrAuthCritical{
message: fmt.Sprintf("external authentication failed: %s", err),
}
}
}
if pathIPs != nil {
tmp, _, _ := net.SplitHostPort(req.RemoteAddr)
ip := net.ParseIP(tmp)
if !ipEqualOrInRange(ip, pathIPs) {
return pathErrAuthCritical{
message: fmt.Sprintf("IP '%s' not allowed", ip),
}
}
}
if pathUser != "" {
user, pass, ok := req.BasicAuth()
if !ok {
return pathErrAuthNotCritical{}
}
if user != string(pathUser) || pass != string(pathPass) {
return pathErrAuthCritical{
message: "invalid credentials",
}
}
}
return nil
}
// onRequest is called by hlsserver.Server (forwarded from ServeHTTP).
func (m *hlsMuxer) onRequest(req hlsMuxerRequest) {
select {
case m.request <- req:
case <-m.ctx.Done():
req.res <- hlsMuxerResponse{status: http.StatusNotFound}
}
}
// onReaderAccepted implements reader.
func (m *hlsMuxer) onReaderAccepted() {
m.log(logger.Info, "is converting into HLS")
}
// onReaderData implements reader.
func (m *hlsMuxer) onReaderData(data *data) {
m.ringBuffer.Push(data)
}
// onReaderAPIDescribe implements reader.
func (m *hlsMuxer) onReaderAPIDescribe() interface{} {
return struct {
Type string `json:"type"`
}{"hlsMuxer"}
}
// onAPIHLSMuxersList is called by api.
func (m *hlsMuxer) onAPIHLSMuxersList(req hlsServerAPIMuxersListSubReq) {
req.res = make(chan struct{})
select {
case m.hlsServerAPIMuxersList <- req:
<-req.res
case <-m.ctx.Done():
}
}