--- mbtransquant.c	2002/08/17 16:22:58	1.9
+++ mbtransquant.c	2002/09/04 06:24:37	1.11
@@ -105,7 +105,9 @@
 
 	start_timer();
 	pMB->field_dct = 0;
-	if ((frame->global_flags & XVID_INTERLACING)) {
+	if ((frame->global_flags & XVID_INTERLACING) &&
+		(x_pos>0) && (x_pos<pParam->mb_width-1) &&
+		(y_pos>0) && (y_pos<pParam->mb_height-1)) {
 		pMB->field_dct = MBDecideFieldDCT(data);
 	}
 	stop_interlacing_timer();
@@ -183,7 +185,9 @@
 
 	start_timer();
 	pMB->field_dct = 0;
-	if ((frame->global_flags & XVID_INTERLACING)) {
+	if ((frame->global_flags & XVID_INTERLACING) &&
+		(x_pos>0) && (x_pos<pParam->mb_width-1) &&
+		(y_pos>0) && (y_pos<pParam->mb_height-1)) {
 		pMB->field_dct = MBDecideFieldDCT(data);
 	}
 	stop_interlacing_timer();
@@ -296,8 +300,6 @@
 MBTransQuantInterBVOP(const MBParam * pParam,
 				  FRAMEINFO * frame,
 				  MACROBLOCK * pMB,
-				  const uint32_t x_pos,
-				  const uint32_t y_pos,
 				  int16_t data[6 * 64],
 				  int16_t qcoeff[6 * 64])
 {