diff --git a/inc/mpp_packet.h b/inc/mpp_packet.h
index fd5577a7..72006dbd 100644
--- a/inc/mpp_packet.h
+++ b/inc/mpp_packet.h
@@ -41,10 +41,8 @@ void*   mpp_packet_get_data(const MppPacket packet);
 void    mpp_packet_set_size(MppPacket packet, size_t size);
 size_t  mpp_packet_get_size(const MppPacket packet);
 
-void    mpp_packet_set_offset(MppPacket packet, size_t offset);
-size_t  mpp_packet_get_offset(const MppPacket packet);
-void    mpp_packet_set_length(MppPacket packet, size_t length);
-size_t  mpp_packet_get_length(const MppPacket packet);
+void    mpp_packet_set_pos(MppPacket packet, void *pos);
+void*   mpp_packet_get_pos(const MppPacket packet);
 
 void    mpp_packet_set_pts(MppPacket packet, RK_S64 pts);
 RK_S64  mpp_packet_get_pts(const MppPacket packet);
diff --git a/mpp/mpp_packet.cpp b/mpp/mpp_packet.cpp
index 765a2823..94b034e1 100644
--- a/mpp/mpp_packet.cpp
+++ b/mpp/mpp_packet.cpp
@@ -23,8 +23,7 @@
 
 MPP_PACKET_ACCESSORS(void*,  data)
 MPP_PACKET_ACCESSORS(size_t, size)
-MPP_PACKET_ACCESSORS(size_t, offset)
-MPP_PACKET_ACCESSORS(size_t, length)
+MPP_PACKET_ACCESSORS(void*,  pos)
 MPP_PACKET_ACCESSORS(RK_S64, pts)
 MPP_PACKET_ACCESSORS(RK_S64, dts)
 MPP_PACKET_ACCESSORS(RK_U32, flag)
diff --git a/mpp/mpp_packet_impl.h b/mpp/mpp_packet_impl.h
index 3b6e1a6d..a864bc29 100644
--- a/mpp/mpp_packet_impl.h
+++ b/mpp/mpp_packet_impl.h
@@ -34,9 +34,8 @@
  */
 typedef struct {
     void   *data;
+    void   *pos;
     size_t  size;
-    size_t  offset;
-    size_t  length;
 
     RK_S64  pts;
     RK_S64  dts;