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stream.go
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stream.go
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package engine
import (
"context"
"sync"
"time"
utils "github.com/Monibuca/utils/v3"
. "github.com/logrusorgru/aurora"
"github.com/pkg/errors"
)
type StreamCollection struct {
sync.RWMutex
m map[string]*Stream
}
func (sc *StreamCollection) GetStream(streamPath string) *Stream {
sc.RLock()
defer sc.RUnlock()
if s, ok := sc.m[streamPath]; ok {
return s
}
return nil
}
func (sc *StreamCollection) Delete(streamPath string) {
sc.Lock()
delete(sc.m, streamPath)
sc.Unlock()
}
func (sc *StreamCollection) ToList() (r []*Stream) {
sc.RLock()
defer sc.RUnlock()
for _, s := range sc.m {
r = append(r, s)
}
return
}
func (sc *StreamCollection) Range(f func(*Stream)) {
sc.RLock()
defer sc.RUnlock()
for _, s := range sc.m {
f(s)
}
}
func init() {
Streams.m = make(map[string]*Stream)
}
// Streams 所有的流集合
var Streams StreamCollection
var StreamTimeoutError = errors.New("timeout")
//FindStream 根据流路径查找流
func FindStream(streamPath string) *Stream {
return Streams.GetStream(streamPath)
}
// Publish 直接发布
func Publish(streamPath, t string) *Stream {
var stream = &Stream{
StreamPath: streamPath,
Type: t,
}
if stream.Publish() {
return stream
}
return nil
}
type StreamContext struct {
context.Context
cancel context.CancelFunc
timeout *time.Timer //更新时间用来做超时处理
IsTimeout bool
}
func (r *StreamContext) Err() error {
if r.IsTimeout {
return StreamTimeoutError
}
return r.Context.Err()
}
func (r *StreamContext) Update() {
if r.timeout != nil {
r.timeout.Reset(config.PublishTimeout)
}
}
// Stream 流定义
type Stream struct {
StreamContext `json:"-"`
StreamPath string
Type string //流类型,来自发布者
StartTime time.Time //流的创建时间
Subscribers []*Subscriber // 订阅者
VideoTracks Tracks
AudioTracks Tracks
DataTracks Tracks
AutoCloseAfter *int //当无人订阅时延迟N秒后自动停止发布
Transcoding map[string]string //转码配置,key:目标编码,value:发布者提供的编码
subscribeMutex sync.Mutex
OnClose func() `json:"-"`
ExtraProp interface{} //额外的属性,用于实现子类化,减少map的使用
closeDelay *time.Timer
}
func (r *Stream) Close() {
Streams.Lock()
//如果没有发布过,就不需要进行处理
if r.cancel == nil {
Streams.Unlock()
return
}
if r.closeDelay != nil {
r.closeDelay.Stop()
}
r.cancel()
r.cancel = nil
delete(Streams.m, r.StreamPath)
Streams.Unlock()
r.VideoTracks.Dispose()
r.AudioTracks.Dispose()
r.DataTracks.Dispose()
if r.OnClose != nil {
r.OnClose()
}
TriggerHook(HOOK_STREAMCLOSE, r)
utils.Print(Yellow("Stream destoryed :"), BrightCyan(r.StreamPath))
}
// Publish 发布者进行发布操作
func (r *Stream) Publish() bool {
Streams.Lock()
defer Streams.Unlock()
if _, ok := Streams.m[r.StreamPath]; ok {
return false
}
if r.AutoCloseAfter == nil {
r.AutoCloseAfter = &config.AutoCloseAfter
}
r.Context, r.cancel = context.WithCancel(Ctx)
r.VideoTracks.Init(r)
r.AudioTracks.Init(r)
r.DataTracks.Init(r)
r.StartTime = time.Now()
Streams.m[r.StreamPath] = r
utils.Print(Green("Stream publish:"), BrightCyan(r.StreamPath))
//触发钩子
TriggerHook(HOOK_PUBLISH, r)
go r.waitClose()
return true
}
// 等待流关闭
func (r *Stream) waitClose() {
r.timeout = time.NewTimer(config.PublishTimeout)
defer r.timeout.Stop()
var closeChann <-chan time.Time
if *r.AutoCloseAfter > 0 {
r.closeDelay = time.NewTimer(time.Duration(*r.AutoCloseAfter) * time.Second)
r.closeDelay.Stop()
closeChann = r.closeDelay.C
defer r.closeDelay.Stop()
}
select {
case <-r.Done():
case <-closeChann:
utils.Print(Yellow("Stream closeDelay:"), BrightCyan(r.StreamPath))
r.Close()
case <-r.timeout.C:
utils.Print(Yellow("Stream timeout:"), BrightCyan(r.StreamPath))
r.IsTimeout = true
r.Close()
}
}
func (r *Stream) WaitDataTrack(names ...string) *DataTrack {
if !config.EnableVideo {
return nil
}
if track := r.DataTracks.WaitTrack(names...); track != nil {
return track.(*DataTrack)
}
return nil
}
func (r *Stream) WaitVideoTrack(names ...string) *VideoTrack {
if !config.EnableVideo {
return nil
}
if track := r.VideoTracks.WaitTrack(names...); track != nil {
return track.(*VideoTrack)
}
return nil
}
// TODO: 触发转码逻辑
func (r *Stream) WaitAudioTrack(names ...string) *AudioTrack {
if !config.EnableAudio {
return nil
}
if track := r.AudioTracks.WaitTrack(names...); track != nil {
return track.(*AudioTrack)
}
return nil
}
//Subscribe 订阅流
func (r *Stream) Subscribe(s *Subscriber) {
if s.Stream = r; r.Err() == nil {
s.SubscribeTime = time.Now()
utils.Print(Sprintf(Yellow("subscribe :%s %s,to Stream %s"), Blue(s.Type), Cyan(s.ID), BrightCyan(r.StreamPath)))
s.Context, s.cancel = context.WithCancel(r)
r.subscribeMutex.Lock()
if *r.AutoCloseAfter > 0 {
r.closeDelay.Stop()
}
r.Subscribers = append(r.Subscribers, s)
TriggerHook(HOOK_SUBSCRIBE, s, len(r.Subscribers))
r.subscribeMutex.Unlock()
utils.Print(Sprintf(Yellow("%s subscriber %s added remains:%d"), BrightCyan(r.StreamPath), Cyan(s.ID), Blue(len(r.Subscribers))))
}
}
//UnSubscribe 取消订阅流
func (r *Stream) UnSubscribe(s *Subscriber) {
if r.Err() == nil {
var deleted bool
r.subscribeMutex.Lock()
defer r.subscribeMutex.Unlock()
r.Subscribers, deleted = DeleteSliceItem_Subscriber(r.Subscribers, s)
if deleted {
utils.Print(Sprintf(Yellow("%s subscriber %s removed remains:%d"), BrightCyan(r.StreamPath), Cyan(s.ID), Blue(len(r.Subscribers))))
l := len(r.Subscribers)
TriggerHook(HOOK_UNSUBSCRIBE, s, l)
if l == 0 && *r.AutoCloseAfter >= 0 {
if *r.AutoCloseAfter == 0 {
r.Close()
} else {
r.closeDelay.Reset(time.Duration(*r.AutoCloseAfter) * time.Second)
}
}
}
}
}
func DeleteSliceItem_Subscriber(slice []*Subscriber, item *Subscriber) ([]*Subscriber, bool) {
for i, val := range slice {
if val == item {
return append(slice[:i], slice[i+1:]...), true
}
}
return slice, false
}