diff --git a/inc/mpp_meta.h b/inc/mpp_meta.h
index e76c2935..0ecf3d6d 100644
--- a/inc/mpp_meta.h
+++ b/inc/mpp_meta.h
@@ -78,6 +78,7 @@ typedef enum MppMetaKey_e {
     KEY_LONG_REF_IDX            = FOURCC_META('l', 't', 'i', 'd'),
     KEY_ROI_DATA                = FOURCC_META('r', 'o', 'i', ' '),
     KEY_OSD_DATA                = FOURCC_META('o', 's', 'd', ' '),
+    KEY_USER_DATA               = FOURCC_META('u', 's', 'r', 'd'),
 } MppMetaKey;
 
 #define mpp_meta_get(meta) mpp_meta_get_with_tag(meta, MODULE_TAG, __FUNCTION__)
diff --git a/inc/rk_venc_cmd.h b/inc/rk_venc_cmd.h
index 71551f54..f8b1d850 100644
--- a/inc/rk_venc_cmd.h
+++ b/inc/rk_venc_cmd.h
@@ -1116,4 +1116,10 @@ typedef struct MppEncOSDData_t {
     MppEncOSDRegion region[8];
 } MppEncOSDData;
 
+typedef struct MppEncUserData_t {
+    RK_U32 len;
+    void   *pdata;
+} MppEncUserData;
+
+
 #endif /*__RK_VENC_CMD_H__*/
diff --git a/mpp/base/mpp_meta.cpp b/mpp/base/mpp_meta.cpp
index 7c376add..8245f7bb 100644
--- a/mpp/base/mpp_meta.cpp
+++ b/mpp/base/mpp_meta.cpp
@@ -45,6 +45,7 @@ static MppMetaDef meta_defs[] = {
 
     {   KEY_ROI_DATA,          TYPE_PTR,      },
     {   KEY_OSD_DATA,          TYPE_PTR,      },
+    {   KEY_USER_DATA,         TYPE_PTR,      },
 };
 
 class MppMetaService