diff --git a/va/va.h b/va/va.h
index 311ff61a1..dd74798a7 100644
--- a/va/va.h
+++ b/va/va.h
@@ -1474,6 +1474,17 @@ typedef union _VAConfigAttribValEncPerBlockControl {
 /** \brief Driver supports decode processing rate report  */
 #define VA_PROCESSING_RATE_DECODE                     0x00000002
 /**@}*/
+
+/** @name segment ID map block size */
+/**@{*/
+/** \brief each segmentID represent a 16x16 block */
+#define VA_SEGID_BLOCK_16X16                          0
+/** \brief each segmentID represent a 32x32 block */
+#define VA_SEGID_BLOCK_32X32                          1
+/** \brief each segmentID represent a 64x64 block */
+#define VA_SEGID_BLOCK_64X64                          2
+/**@}*/
+
 /**
  * if an attribute is not applicable for a given
  * profile/entrypoint pair, then set the value to the following