Process and check create stream command, store transaction id

rtmp/amf/command.go

@@ -33,6 +33,26 @@ func (amf_obj_root AMFObj) ProcessConnect() (err error) {
 	return 
 }
 
+func (amf_obj_root AMFObj) ProcessCreateStream(trans_id *float64) (err error) {
+	err = errors.New("Bad AMF create stream")
+	if _, ok := amf_obj_root[0]; !ok {
+		return
+	} else if command_string, ok := amf_obj_root[0].(string); !ok || command_string != "createStream" {
+		return
+	}
+
+	if _, ok := amf_obj_root[1]; !ok {
+		return
+	}
+	transac_id_float, ok := amf_obj_root[1].(float64)
+	if !ok {
+		return
+	}
+	*trans_id = transac_id_float
+	err = nil
+	return
+}
+
 func EncodeConnectResponse() ([]byte, error) {
 	amf_root_obj := make(AMFObj)
 	amf_root_obj[0] = "_result"