opt:尝试优化使用goroutine发rtmp包，优化连接数过多时可能会带来性能问题

protocol/rtmp/stream.go

@@ -98,12 +98,22 @@ type Stream struct {
 type PackWriterCloser struct {
 	init bool
 	w    av.WriteCloser
+	pch  chan *TransPacketData
+}
+
+type TransPacketData struct {
+	P       *av.Packet
+	SessKey interface{}
 }
 
 func (p *PackWriterCloser) GetWriter() av.WriteCloser {
 	return p.w
 }
 
+func (p *PackWriterCloser) SendPacket(tp *TransPacketData) {
+	p.pch <- tp
+}
+
 func NewStream() *Stream {
 	return &Stream{
 		cache: cache.NewCache(),
@@ -145,11 +155,26 @@ func (s *Stream) AddReader(r av.ReadCloser) {
 func (s *Stream) AddWriter(w av.WriteCloser) {
 	info := w.Info()
 	pw := &PackWriterCloser{w: w}
+	pw.pch = make(chan *TransPacketData, 50)
+
+	//run a goroutine to write player packet
+	go func() {
+		for {
+			p := <-pw.pch
+			if err := pw.w.Write(p.P); err != nil {
+				log.Debugf("[%s] write packet error: %v, remove", p.SessKey, err)
+				s.ws.Delete(p.SessKey)
+				break
+			}
+		}
+	}()
 	s.ws.Store(info.UID, pw)
 }
 
-/*检测本application下是否配置static_push,
-如果配置, 启动push远端的连接*/
+/*
+检测本application下是否配置static_push,
+如果配置, 启动push远端的连接
+*/
 func (s *Stream) StartStaticPush() {
 	key := s.info.Key
 
@@ -346,10 +371,18 @@ func (s *Stream) TransStart() {
 				newPacket := p
 				//writeType := reflect.TypeOf(v.w)
 				//log.Debugf("w.Write: type=%v, %v", writeType, v.w.Info())
-				if err = v.w.Write(&newPacket); err != nil {
-					log.Debugf("[%s] write packet error: %v, remove", v.w.Info(), err)
-					s.ws.Delete(key)
+
+				// if err = v.w.Write(&newPacket); err != nil {
+				// 	log.Debugf("[%s] write packet error: %v, remove", v.w.Info(), err)
+				// 	s.ws.Delete(key)
+				// }
+				d := TransPacketData{
+					P:       &newPacket,
+					SessKey: key,
 				}
+
+				go v.SendPacket(&d)
+
 			}
 			return true
 		})