diff --git a/readme.txt b/readme.txt
index 91d52bd4..c29826fe 100644
--- a/readme.txt
+++ b/readme.txt
@@ -40,9 +40,57 @@ NOTE:
    |
    |----- mpp            Media Process Platform : mpi function private implement and mpp infrastructure (vpu_api private layer)
    |  |
-   |  |----- dec         general decoder loop module
+   |  |----- codec       all video codec parser, convert stream to protocol structure
+   |  |  |
+   |  |  |----- inc      header files provided by codec module for external usage
+   |  |  |
+   |  |  |----- dec
+   |  |  |  |
+   |  |  |  |----- h264
+   |  |  |  |
+   |  |  |  |----- h265
+   |  |  |  |
+   |  |  |  |----- vp9
+   |  |  |  |
+   |  |  |  |----- jpeg
+   |  |  |
+   |  |  |----- enc
+   |  |     |
+   |  |     |----- h264
+   |  |     |
+   |  |     |----- h265
+   |  |     |
+   |  |     |----- jpeg
    |  |
-   |  |----- enc         general encoder loop module
+   |  |----- hal         Hardware Abstract Layer (HAL): modules used in mpi
+   |  |  |
+   |  |  |----- inc      header files provided by hal for external usage
+   |  |  |
+   |  |  |----- iep      iep user library
+   |  |  |
+   |  |  |----- pp       post-processor user library
+   |  |  |
+   |  |  |----- rga      rga user library
+   |  |  |
+   |  |  |----- deinter  deinterlace function module including pp/iep/rga
+   |  |  |
+   |  |  |----- rkdec    rockchip hardware decoder register generation library
+   |  |  |  |
+   |  |  |  |----- h264d generate register file from H.264 structure created by codec parser
+   |  |  |  |
+   |  |  |  |----- h265d generate register file from H.265 structure created by codec parser
+   |  |  |  |
+   |  |  |  |----- vp9d  generate register file from vp9 structure created by codec parser
+   |  |  |
+   |  |  |----- vpu      vpu register generation library
+   |  |     |
+   |  |     |----- h264d generate register file from H.264 structure created by codec parser
+   |  |     |
+   |  |     |----- h265d generate register file from H.265 structure created by codec parser
+   |  |
+   |  |----- legacy      legacy vpu_api interface
+   |  |
+   |  |----- syntax      syntax interface for different video codec protocol
    |
    |----- test           mpi/mpp unit test files and mpi demo files
    |
@@ -54,65 +102,18 @@ NOTE:
    |  |
    |  |----- lib         library file output directory
    |
-   |----- hal            Hardware Abstract Layer (HAL): modules used in mpi
-   |  |
-   |  |----- inc         header files provided by hal for external usage
-   |  |
-   |  |----- iep         iep user library
-   |  |
-   |  |----- pp          post-processor user library
-   |  |
-   |  |----- rga         rga user library
-   |  |
-   |  |----- deinter     deinterlace function module including pp/iep/rga
-   |  |
-   |  |----- rkdec       rockchip hardware decoder register generation library
-   |  |  |
-   |  |  |----- h264d    generate register file from H.264 structure created by codec parser
-   |  |  |
-   |  |  |----- h265d    generate register file from H.265 structure created by codec parser
-   |  |  |
-   |  |  |----- vp9d     generate register file from vp9 structure created by codec parser
-   |  |
-   |  |----- vpu         vpu register generation library
-   |     |
-   |     |----- h264d    generate register file from H.264 structure created by codec parser
-   |     |
-   |     |----- h265d    generate register file from H.265 structure created by codec parser
-   |
    |----- osal           Operation System Abstract Layer: abstract layer for different operation system
-   |  |
-   |  |----- mem     	 mpi memory subsystem for hardware
-   |  |
-   |  |----- android     google's android
-   |  |
-   |  |----- linux       mainline linux kernel
-   |  |
-   |  |----- window      microsoft's window
-   |  |
-   |  |----- test        OASL unit test
-   |
-   |----- codec          all video codec parser, convert stream to protocol structure
       |
-      |----- inc         header files provided by codec module for external usage
-	  |
-	  |----- dec
-      |  |
-      |  |----- h264
-      |  |
-      |  |----- h265
-      |  |
-      |  |----- vp9
-	  |  |
-      |  |----- jpeg
-	  |
-	  |----- enc
-         |
-         |----- h264
-         |
-         |----- h265
-         |
-         |----- jpeg
+      |----- mem     	 mpi memory subsystem for hardware
+      |
+      |----- android     google's android
+      |
+      |----- linux       mainline linux kernel
+      |
+      |----- window      microsoft's window
+      |
+      |----- test        OASL unit test
+    
 
 Here is the mpp implement overall framework: