Add support snd mode for wyoming module

internal/wyoming/wyoming.go

@@ -93,6 +93,8 @@ func handle(srv *wyoming.Server, mode string, conn net.Conn) {
 	switch mode {
 	case "mic":
 		err = srv.HandleMic(conn)
+	case "snd":
+		err = srv.HandleSnd(conn)
 	default:
 		err = srv.Handle(conn)
 	}

pkg/wyoming/satellite.go

@@ -377,7 +377,9 @@ func (s *sndProducer) Start() error {
 		seq++
 	}
 
-	s.onClose()
+	if s.onClose != nil {
+		s.onClose()
+	}
 
 	return nil
 }

pkg/wyoming/snd.go

@@ -0,0 +1,40 @@
+package wyoming
+
+import (
+	"io"
+	"net"
+	"time"
+)
+
+func (s *Server) HandleSnd(conn net.Conn) error {
+	defer conn.Close()
+
+	var snd []byte
+
+	api := NewAPI(conn)
+	for {
+		evt, err := api.ReadEvent()
+		if err != nil {
+			if err == io.EOF {
+				return nil
+			}
+			return err
+		}
+
+		s.Trace("event: %s data: %s payload: %d", evt.Type, evt.Data, len(evt.Payload))
+
+		switch evt.Type {
+		case "audio-start":
+			snd = snd[:0]
+		case "audio-chunk":
+			snd = append(snd, evt.Payload...)
+		case "audio-stop":
+			prod := newSndProducer(snd, func() {
+				time.Sleep(time.Second) // some extra delay before close
+			})
+			if err = s.SndHandler(prod); err != nil {
+				return err
+			}
+		}
+	}
+}