diff --git a/rtmp/amf.go b/rtmp/amf.go
new file mode 100644
index 00000000..5170b278
--- /dev/null
+++ b/rtmp/amf.go
@@ -0,0 +1,23 @@
+package rtmp
+
+const (
+	AMF_NUMBER = iota
+	AMF_BOOLEAN
+	AMF_STRING
+	AMF_OBJECT
+	AMF_MOVIECLIP /* reserved, not used */
+	AMF_NULL
+	AMF_UNDEFINED
+	AMF_REFERENCE
+	AMF_ECMA_ARRAY
+	AMF_OBJECT_END
+	AMF_STRICT_ARRAY
+	AMF_DATE
+	AMF_LONG_STRING
+	AMF_UNSUPPORTED
+	AMF_RECORDSET /* reserved, not used */
+	AMF_XML_DOC
+	AMF_TYPED_OBJECT
+	AMF_AVMPLUS /* switch to AMF3 */
+	AMF_INVALID = 0xff
+)