diff --git a/va/va.h b/va/va.h
index 9cb0a4975..13d0069d8 100644
--- a/va/va.h
+++ b/va/va.h
@@ -214,10 +214,18 @@ typedef int VAStatus;	/** Return status type from functions */
 #define VA_STATUS_ERROR_NOT_ENOUGH_BUFFER       0x00000025
 #define VA_STATUS_ERROR_UNKNOWN			0xFFFFFFFF
 
-/** De-interlacing flags for vaPutSurface() */
+/** 
+ * 1. De-interlacing flags for vaPutSurface() 
+ * 2. Surface sample type for input/output surface flag
+ *    - Progressive: VA_FRAME_PICTURE
+ *    - Interleaved: VA_TOP_FIELD_FIRST, VA_BOTTOM_FIELD_FIRST
+ *    - Field: VA_TOP_FIELD, VA_BOTTOM_FIELD
+*/
 #define VA_FRAME_PICTURE        0x00000000 
 #define VA_TOP_FIELD            0x00000001
 #define VA_BOTTOM_FIELD         0x00000002
+#define VA_TOP_FIELD_FIRST      0x00000004
+#define VA_BOTTOM_FIELD_FIRST   0x00000008
 
 /**
  * Enabled the positioning/cropping/blending feature:
diff --git a/va/va_vpp.h b/va/va_vpp.h
index 673ddc740..4de27eee4 100755
--- a/va/va_vpp.h
+++ b/va/va_vpp.h
@@ -1012,15 +1012,56 @@ typedef struct _VAProcPipelineParameterBuffer {
     /**
      * \brief Flag to indicate the input surface flag
      *
-     * bit0: 0 non-protected 1: protected
-     * bit 1~31 for future
+     * bit0~3: Surface sample type
+     * - 0000: Progressive --> VA_FRAME_PICTURE
+     * - 0001: Single Top Field --> VA_TOP_FIELD
+     * - 0010: Single Bottom Field --> VA_BOTTOM_FIELD  
+     * - 0100: Interleaved Top Field First --> VA_TOP_FIELD_FIRST
+     * - 1000: Interleaved Bottom Field First --> VA_BOTTOM_FIELD_FIRST
+     *
+     * For interlaced scaling, examples as follow:
+     * - 1. Interleaved to Interleaved (Suppose input is top field first)
+     *   -- set input_surface_flag as VA_TOP_FIELD_FIRST
+     *   -- set output_surface_flag as VA_TOP_FIELD_FIRST
+     * - 2. Interleaved to Field (Suppose input is top field first)
+     *   An interleaved frame need to be passed twice.
+     *   First cycle to get the first field:
+     *   -- set input_surface_flag as VA_TOP_FIELD_FIRST
+     *   -- set output_surface_flag as VA_TOP_FIELD
+     *   Second cycle to get the second field:
+     *   -- set input_surface_flag as VA_TOP_FIELD_FIRST
+     *   -- set output_surface_flag as VA_BOTTOM_FIELD
+     * - 3. Field to Interleaved (Suppose first field is top field)
+     *   -- create two surfaces, one for top field, the other for bottom field
+     *   -- set surface with the first field surface id
+     *   -- set backward_reference with the second field surface id
+     *   -- set input_surface_flag as VA_TOP_FIELD
+     *   -- set output_surface_flag as VA_TOP_FIELD_FIRST
+     * - 4. Field to Field: 
+     *   -- set flag according to each frame.
+     *
+     * bit31: Surface encryption
+     * - 0: non-protected  
+     * - 1: protected
+     *
+     * bit4~30 for future
      */
     uint32_t        input_surface_flag;
     /**
      * \brief Flag to indicate the output surface flag
      *
-     * bit0: 0 non-protected  1: protected
-     * bit 1~31 for future
+     * bit0~3: Surface sample type
+     * - 0000: Progressive --> VA_FRAME_PICTURE
+     * - 0001: Top Field --> VA_TOP_FIELD
+     * - 0010: Bottom Field --> VA_BOTTOM_FIELD  
+     * - 0100: Top Field First --> VA_TOP_FIELD_FIRST
+     * - 1000: Bottom Field First --> VA_BOTTOM_FIELD_FIRST
+     *
+     * bit31: Surface encryption
+     * - 0: non-protected  
+     * - 1: protected
+     *
+     * bit4~30 for future
      */
     uint32_t        output_surface_flag;
     /**