+/** This block contains an interlaced picture with top field first */
+#define BLOCK_FLAG_TOP_FIELD_FIRST 0x2000
+/** This block contains an interlaced picture with bottom field first */
+#define BLOCK_FLAG_BOTTOM_FIELD_FIRST 0x4000
+
+/** This block contains an interlaced picture */
+#define BLOCK_FLAG_INTERLACED_MASK \
+ (BLOCK_FLAG_TOP_FIELD_FIRST|BLOCK_FLAG_BOTTOM_FIELD_FIRST)