diff --git a/kmpp/base/inc/kmpp_buffer.h b/kmpp/base/inc/kmpp_buffer.h
index ce758112..88f71fd3 100644
--- a/kmpp/base/inc/kmpp_buffer.h
+++ b/kmpp/base/inc/kmpp_buffer.h
@@ -72,6 +72,8 @@ rk_s32 kmpp_buf_grp_setup(KmppBufGrp grp);
 
 KmppBufCfg kmpp_buffer_to_cfg(KmppBuffer buf);
 rk_s32 kmpp_buffer_setup(KmppBuffer buffer);
+rk_s32 kmpp_buffer_inc_ref(KmppBuffer buffer);
+rk_s32 kmpp_buffer_flush(KmppBuffer buffer);
 
 #define KMPP_BUF_CFG_ENTRY_TABLE(prefix, ENTRY, STRCT, EHOOK, SHOOK, ALIAS) \
     ENTRY(prefix, u32,  rk_u32,         size,       FLAG_NONE,  size) \
diff --git a/kmpp/base/inc/kmpp_meta_impl.h b/kmpp/base/inc/kmpp_meta_impl.h
index 463ed64c..c4156de9 100644
--- a/kmpp/base/inc/kmpp_meta_impl.h
+++ b/kmpp/base/inc/kmpp_meta_impl.h
@@ -29,8 +29,6 @@ typedef struct __attribute__((packed)) KmppMetaShmVal_t {
 extern "C" {
 #endif
 
-MPP_RET kmpp_meta_inc_ref(KmppMeta meta);
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/kmpp/base/kmpp_buffer.c b/kmpp/base/kmpp_buffer.c
index bcfe23c8..2b29a998 100644
--- a/kmpp/base/kmpp_buffer.c
+++ b/kmpp/base/kmpp_buffer.c
@@ -128,6 +128,30 @@ rk_s32 kmpp_buffer_setup(KmppBuffer buffer)
     return kmpp_obj_ioctl_f(buffer, 0, buffer, NULL);
 }
 
+rk_s32 kmpp_buffer_inc_ref(KmppBuffer buffer)
+{
+    KmppBufferImpl *impl = (KmppBufferImpl *)kmpp_obj_to_entry(buffer);
+
+    if (!impl) {
+        mpp_loge_f("invalid NULL buffer\n");
+        return rk_nok;
+    }
+
+    return kmpp_obj_ioctl_f(buffer, 1, buffer, NULL);
+}
+
+rk_s32 kmpp_buffer_flush(KmppBuffer buffer)
+{
+    KmppBufferImpl *impl = (KmppBufferImpl *)kmpp_obj_to_entry(buffer);
+
+    if (!impl) {
+        mpp_loge_f("invalid NULL buffer\n");
+        return rk_nok;
+    }
+
+    return kmpp_obj_ioctl_f(buffer, 2, buffer, NULL);
+}
+
 rk_s32 kmpp_buffer_impl_init(void *entry, KmppObj obj, const char *caller)
 {
     KmppBufPriv *priv = (KmppBufPriv *)kmpp_obj_to_priv(obj);