Add support DVRIP source

cmd/dvrip/dvrip.go

@@ -0,0 +1,25 @@
+package dvrip
+
+import (
+	"github.com/AlexxIT/go2rtc/cmd/streams"
+	"github.com/AlexxIT/go2rtc/pkg/dvrip"
+	"github.com/AlexxIT/go2rtc/pkg/streamer"
+)
+
+func Init() {
+	streams.HandleFunc("dvrip", handle)
+}
+
+func handle(url string) (streamer.Producer, error) {
+	conn := dvrip.NewClient(url)
+	if err := conn.Dial(); err != nil {
+		return nil, err
+	}
+	if err := conn.Play(); err != nil {
+		return nil, err
+	}
+	if err := conn.Handle(); err != nil {
+		return nil, err
+	}
+	return conn, nil
+}