diff --git a/rtmp/amf.go b/rtmp/amf.go
index 5170b278..a78fd291 100644
--- a/rtmp/amf.go
+++ b/rtmp/amf.go
@@ -21,3 +21,32 @@ const (
 	AMF_AVMPLUS /* switch to AMF3 */
 	AMF_INVALID = 0xff
 )
+
+var (
+	AMFObj_Invalid  C_AMFObject
+	AMFProp_Invalid = C_AMFObjectProperty{p_type: AMF_INVALID}
+)
+
+// typedef struct AMF_Object
+// amf.h +67
+type C_AMFObject struct {
+	o_num   int32
+	o_props *C_AMFObjectProperty
+}
+
+// typedef struct AMFObjectProperty
+// amf.h +79
+type C_AMFObjectProperty struct {
+	p_name      C_AVal
+	p_type      C_AMFDataType
+	p_vu        P_vu
+	p_UTCoffset int16
+}
+
+// typedef struct P_vu
+// amf.h +73
+type P_vu struct {
+	p_number float64
+	p_aval   C_AVal
+	p_object C_AMFObject
+}
diff --git a/rtmp/rtmp.go b/rtmp/rtmp.go
index d84f42c4..72a61385 100644
--- a/rtmp/rtmp.go
+++ b/rtmp/rtmp.go
@@ -208,8 +208,6 @@ var (
 )
 
 var (
-	AMFObj_Invalid           C_AMFObject
-	AMFProp_Invalid          = C_AMFObjectProperty{p_type: AMF_INVALID}
 	packetSize               = [...]int{12, 8, 4, 1}
 	RTMPProtocolStringsLower = [...]string{
 		"rtmp",
@@ -374,30 +372,6 @@ type C_RTMP_LNK struct {
 	port          uint16
 }
 
-// typedef struct AMF_Object
-// amf.h +67
-type C_AMFObject struct {
-	o_num   int32
-	o_props *C_AMFObjectProperty
-}
-
-// typedef struct AMFObjectProperty
-// amf.h +79
-type C_AMFObjectProperty struct {
-	p_name      C_AVal
-	p_type      C_AMFDataType
-	p_vu        P_vu
-	p_UTCoffset int16
-}
-
-// typedef struct P_vu
-// amf.h +73
-type P_vu struct {
-	p_number float64
-	p_aval   C_AVal
-	p_object C_AMFObject
-}
-
 // NewSession returns a new session.
 func NewSession(url string, connectTimeout uint) *Session {
 	return &Session{