improve performance of multicast writer (#385)

server_multicast_writer.go

@@ -2,21 +2,14 @@ package gortsplib
 
 import (
 	"net"
-
-	"github.com/bluenviron/gortsplib/v3/pkg/ringbuffer"
 )
 
-type typeAndPayload struct {
-	isRTP   bool
-	payload []byte
-}
-
 type serverMulticastWriter struct {
 	rtpl     *serverUDPListener
 	rtcpl    *serverUDPListener
-	writeBuffer *ringbuffer.RingBuffer
-
-	writerDone chan struct{}
+	writer   asyncProcessor
+	rtpAddr  *net.UDPAddr
+	rtcpAddr *net.UDPAddr
 }
 
 func newServerMulticastWriter(s *Server) (*serverMulticastWriter, error) {
@@ -36,16 +29,25 @@ func newServerMulticastWriter(s *Server) (*serverMulticastWriter, error) {
 		return nil, err
 	}
 
-	wb, _ := ringbuffer.New(uint64(s.WriteBufferCount))
+	rtpAddr := &net.UDPAddr{
+		IP:   rtpl.ip(),
+		Port: rtpl.port(),
+	}
+
+	rtcpAddr := &net.UDPAddr{
+		IP:   rtcpl.ip(),
+		Port: rtcpl.port(),
+	}
 
 	h := &serverMulticastWriter{
 		rtpl:     rtpl,
 		rtcpl:    rtcpl,
-		writeBuffer: wb,
-		writerDone:  make(chan struct{}),
+		rtpAddr:  rtpAddr,
+		rtcpAddr: rtcpAddr,
 	}
 
-	go h.runWriter()
+	h.writer.allocateBuffer(s.WriteBufferCount)
+	h.writer.start()
 
 	return h, nil
 }
@@ -53,52 +55,21 @@ func newServerMulticastWriter(s *Server) (*serverMulticastWriter, error) {
 func (h *serverMulticastWriter) close() {
 	h.rtpl.close()
 	h.rtcpl.close()
-	h.writeBuffer.Close()
-	<-h.writerDone
+	h.writer.stop()
 }
 
 func (h *serverMulticastWriter) ip() net.IP {
 	return h.rtpl.ip()
 }
 
-func (h *serverMulticastWriter) runWriter() {
-	defer close(h.writerDone)
-
-	rtpAddr := &net.UDPAddr{
-		IP:   h.rtpl.ip(),
-		Port: h.rtpl.port(),
-	}
-
-	rtcpAddr := &net.UDPAddr{
-		IP:   h.rtcpl.ip(),
-		Port: h.rtcpl.port(),
-	}
-
-	for {
-		tmp, ok := h.writeBuffer.Pull()
-		if !ok {
-			return
-		}
-		data := tmp.(typeAndPayload)
-
-		if data.isRTP {
-			h.rtpl.write(data.payload, rtpAddr) //nolint:errcheck
-		} else {
-			h.rtcpl.write(data.payload, rtcpAddr) //nolint:errcheck
-		}
-	}
-}
-
 func (h *serverMulticastWriter) writePacketRTP(payload []byte) {
-	h.writeBuffer.Push(typeAndPayload{
-		isRTP:   true,
-		payload: payload,
+	h.writer.queue(func() {
+		h.rtpl.write(payload, h.rtpAddr) //nolint:errcheck
 	})
 }
 
 func (h *serverMulticastWriter) writePacketRTCP(payload []byte) {
-	h.writeBuffer.Push(typeAndPayload{
-		isRTP:   false,
-		payload: payload,
+	h.writer.queue(func() {
+		h.rtcpl.write(payload, h.rtcpAddr) //nolint:errcheck
 	})
 }