diff --git a/CMakeLists.txt b/CMakeLists.txt
index 41146658..4ebad81a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -346,6 +346,8 @@ list( LENGTH module_list module_size )
 # ----------------------------------------------------------------------------
 # project overall include file
 include_directories(inc)
+# small utile functions for test case
+include_directories(utils)
 
 # ----------------------------------------------------------------------------
 #  osal library
@@ -355,6 +357,11 @@ include_directories(osal/inc)
 # OSAL is needed on all platform, do not need option
 add_subdirectory(osal)
 
+# ----------------------------------------------------------------------------
+#  utils for test case
+# ----------------------------------------------------------------------------
+add_subdirectory(utils)
+
 # ----------------------------------------------------------------------------
 #  Media Process Platform library
 # ----------------------------------------------------------------------------
diff --git a/mpp/codec/dec/h265/h265d_parser.c b/mpp/codec/dec/h265/h265d_parser.c
index 4786f051..3906ccda 100644
--- a/mpp/codec/dec/h265/h265d_parser.c
+++ b/mpp/codec/dec/h265/h265d_parser.c
@@ -1459,7 +1459,7 @@ MPP_RET h265d_prepare(void *ctx, MppPacket pkt, HalDecTask *task)
     HEVCContext *s = h265dctx->priv_data;
     RK_U8 *buf = NULL;
     void *pos = NULL;
-    RK_S32 length = 0;
+    size_t length = 0;
     s->eos = mpp_packet_get_eos(pkt);
     buf = mpp_packet_get_pos(pkt);
     length = mpp_packet_get_size(pkt);
diff --git a/mpp/codec/dec/h265/h265d_ps.c b/mpp/codec/dec/h265/h265d_ps.c
index a7dfaefe..63d53d51 100644
--- a/mpp/codec/dec/h265/h265d_ps.c
+++ b/mpp/codec/dec/h265/h265d_ps.c
@@ -1302,7 +1302,7 @@ static int scaling_list_data(HEVCContext *s, ScalingList *sl)
     RK_U32 matrix_id;
 
     for (size_id = 0; size_id < 4; size_id++)
-        for (matrix_id = 0; matrix_id < (size_id == 3 ? 2 : 6); matrix_id++) {
+    for (matrix_id = 0; matrix_id < (RK_U32)((size_id == 3) ? 2 : 6); matrix_id++) {
             READ_BIT1(gb, &scaling_list_pred_mode_flag[size_id][matrix_id]);
             if (!scaling_list_pred_mode_flag[size_id][matrix_id]) {
                 RK_U32 delta = 0;
diff --git a/utils/CMakeLists.txt b/utils/CMakeLists.txt
new file mode 100644
index 00000000..9efb0877
--- /dev/null
+++ b/utils/CMakeLists.txt
@@ -0,0 +1,8 @@
+# vim: syntax=cmake
+# ----------------------------------------------------------------------------
+# add libvpu implement
+# ----------------------------------------------------------------------------
+add_library(utils STATIC
+    utils.c
+    )
+target_link_libraries(utils osal)
\ No newline at end of file
diff --git a/utils/utils.c b/utils/utils.c
new file mode 100644
index 00000000..7c35ef28
--- /dev/null
+++ b/utils/utils.c
@@ -0,0 +1,24 @@
+/*
+ *
+ * Copyright 2010 Rockchip Electronics S.LSI Co. LTD
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define MODULE_TAG "utils"
+
+#include <string.h>
+
+#include "mpp_log.h"
+
+
diff --git a/utils/utils.h b/utils/utils.h
new file mode 100644
index 00000000..6429a417
--- /dev/null
+++ b/utils/utils.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright 2010 Rockchip Electronics S.LSI Co. LTD
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __UTILS_H__
+#define __UTILS_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /*__UTILS_H__*/
+