--- decoder.c	2004/03/22 22:36:23	1.51
+++ decoder.c	2004/08/29 11:36:22	1.51.2.8
@@ -20,7 +20,7 @@
  *  along with this program ; if not, write to the Free Software
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  *
- * $Id: decoder.c,v 1.51 2004/03/22 22:36:23 edgomez Exp $
+ * $Id: decoder.c,v 1.51.2.8 2004/08/29 11:36:22 edgomez Exp $
  *
  ****************************************************************************/
 
@@ -222,6 +222,7 @@
 	dec->time = dec->time_base = dec->last_time_base = 0;
 	dec->low_delay = 0;
 	dec->packed_mode = 0;
+	dec->time_inc_resolution = 1; /* until VOL header says otherwise */
 
 	dec->fixed_dimensions = (dec->width > 0 && dec->height > 0);
 
@@ -338,7 +339,7 @@
 		stop_coding_timer();
 
 		start_timer();
-		add_acdc(pMB, i, &block[i * 64], iDcScaler, predictors);
+		add_acdc(pMB, i, &block[i * 64], iDcScaler, predictors, dec->bs_version);
 		stop_prediction_timer();
 
 		start_timer();
@@ -459,6 +460,42 @@
 	stop_transfer_timer();
 }
 
+static void __inline
+validate_vector(VECTOR * mv, unsigned int x_pos, unsigned int y_pos, const DECODER * dec)
+{
+	/* clip a vector to valid range 
+	   prevents crashes if bitstream is broken 
+	*/
+	int shift = 5 + dec->quarterpel;
+	int xborder_high = (int)(dec->mb_width - x_pos) << shift;
+	int xborder_low = (-(int)x_pos-1) << shift;
+	int yborder_high = (int)(dec->mb_height - y_pos) << shift;
+	int yborder_low = (-(int)y_pos-1) << shift;
+
+#define CHECK_MV(mv) \
+	do { \
+	if ((mv).x > xborder_high) { \
+		DPRINTF(XVID_DEBUG_MV, "mv.x > max -- %d > %d, MB %d, %d", (mv).x, xborder_high, x_pos, y_pos); \
+		(mv).x = xborder_high; \
+	} else if ((mv).x < xborder_low) { \
+		DPRINTF(XVID_DEBUG_MV, "mv.x < min -- %d < %d, MB %d, %d", (mv).x, xborder_low, x_pos, y_pos); \
+		(mv).x = xborder_low; \
+	} \
+	if ((mv).y > yborder_high) { \
+		DPRINTF(XVID_DEBUG_MV, "mv.y > max -- %d > %d, MB %d, %d", (mv).y, yborder_high, x_pos, y_pos); \
+		(mv).y = yborder_high; \
+	} else if ((mv).y < yborder_low) { \
+		DPRINTF(XVID_DEBUG_MV, "mv.y < min -- %d < %d, MB %d, %d", (mv).y, yborder_low, x_pos, y_pos); \
+		(mv).y = yborder_low; \
+	} \
+	} while (0)
+
+	CHECK_MV(mv[0]);
+	CHECK_MV(mv[1]);
+	CHECK_MV(mv[2]);
+	CHECK_MV(mv[3]);
+}
+
 /* decode an inter macroblock */
 static void
 decoder_mbinter(DECODER * dec,
@@ -496,6 +533,8 @@
 			mv[i] = pMB->mvs[i];
 	}
 
+	validate_vector(mv, x_pos, y_pos, dec);
+
 	start_timer();
 
 	if (pMB->mode != MODE_INTER4V) { /* INTER, INTER_Q, NOT_CODED, FORWARD, BACKWARD */
@@ -761,20 +800,6 @@
 		mv.y -= range;
 	}
 
-	/* clip to valid range */
-
-	if (mv.x > ((int)(dec->mb_width - x) << (5 + dec->quarterpel)) )
-		mv.x = (int)(dec->mb_width - x) << (5 + dec->quarterpel);
-	
-	else if (mv.x < (int)(-x-1) << (5 + dec->quarterpel))
-		mv.x = (int)(-x-1) << (5 + dec->quarterpel);
-
-	if (mv.y > ((int)(dec->mb_height - y) << (5 + dec->quarterpel)) )
-		mv.y = (int)(dec->mb_height - y) << (5 + dec->quarterpel);
-
-	else if (mv.y < ((int)(-y-1)) << (5 + dec->quarterpel) )
-		mv.y = (int)(-y-1) << (5 + dec->quarterpel);
-
 	ret_mv->x = mv.x;
 	ret_mv->y = mv.y;
 }
@@ -986,20 +1011,6 @@
 	else if (mv_y > high)
 		mv_y -= range;
 
-
-	/* clip to valid range */
-	if (mv_x > ((int)(dec->mb_width - x) << (5 + dec->quarterpel)) )
-		mv_x = (int)(dec->mb_width - x) << (5 + dec->quarterpel);
-	
-	else if (mv_x < (int)(-x-1) << (5 + dec->quarterpel))
-		mv_x = (int)(-x-1) << (5 + dec->quarterpel);
-
-	if (mv_y > ((int)(dec->mb_height - y) << (5 + dec->quarterpel)) )
-		mv_y = (int)(dec->mb_height - y) << (5 + dec->quarterpel);
-
-	else if (mv_y < ((int)(-y-1)) << (5 + dec->quarterpel) )
-		mv_y = (int)(-y-1) << (5 + dec->quarterpel);
-
 	mv->x = mv_x;
 	mv->y = mv_y;
 }
@@ -1009,7 +1020,7 @@
 decoder_bf_interpolate_mbinter(DECODER * dec,
 								IMAGE forward,
 								IMAGE backward,
-								const MACROBLOCK * pMB,
+								MACROBLOCK * pMB,
 								const uint32_t x_pos,
 								const uint32_t y_pos,
 								Bitstream * bs,
@@ -1026,6 +1037,9 @@
 	pU_Cur = dec->cur.u + (y_pos << 3) * stride2 + (x_pos << 3);
 	pV_Cur = dec->cur.v + (y_pos << 3) * stride2 + (x_pos << 3);
 
+	validate_vector(pMB->mvs, x_pos, y_pos, dec);
+	validate_vector(pMB->b_mvs, x_pos, y_pos, dec);
+
 	if (!direct) {
 		uv_dx = pMB->mvs[0].x;
 		uv_dy = pMB->mvs[0].y;
@@ -1140,32 +1154,32 @@
 	interpolate8x8_avg2(dec->cur.y + (16 * y_pos * stride) + 16 * x_pos,
 						dec->cur.y + (16 * y_pos * stride) + 16 * x_pos,
 						dec->tmp.y + (16 * y_pos * stride) + 16 * x_pos,
-						stride, 1, 8);
+						stride, 0, 8);
 
 	interpolate8x8_avg2(dec->cur.y + (16 * y_pos * stride) + 16 * x_pos + 8,
 						dec->cur.y + (16 * y_pos * stride) + 16 * x_pos + 8,
 						dec->tmp.y + (16 * y_pos * stride) + 16 * x_pos + 8,
-						stride, 1, 8);
+						stride, 0, 8);
 
 	interpolate8x8_avg2(dec->cur.y + ((16 * y_pos + 8) * stride) + 16 * x_pos,
 						dec->cur.y + ((16 * y_pos + 8) * stride) + 16 * x_pos,
 						dec->tmp.y + ((16 * y_pos + 8) * stride) + 16 * x_pos,
-						stride, 1, 8);
+						stride, 0, 8);
 
 	interpolate8x8_avg2(dec->cur.y + ((16 * y_pos + 8) * stride) + 16 * x_pos + 8,
 						dec->cur.y + ((16 * y_pos + 8) * stride) + 16 * x_pos + 8,
 						dec->tmp.y + ((16 * y_pos + 8) * stride) + 16 * x_pos + 8,
-						stride, 1, 8);
+						stride, 0, 8);
 
 	interpolate8x8_avg2(dec->cur.u + (8 * y_pos * stride2) + 8 * x_pos,
 						dec->cur.u + (8 * y_pos * stride2) + 8 * x_pos,
 						dec->tmp.u + (8 * y_pos * stride2) + 8 * x_pos,
-						stride2, 1, 8);
+						stride2, 0, 8);
 
 	interpolate8x8_avg2(dec->cur.v + (8 * y_pos * stride2) + 8 * x_pos,
 						dec->cur.v + (8 * y_pos * stride2) + 8 * x_pos,
 						dec->tmp.v + (8 * y_pos * stride2) + 8 * x_pos,
-						stride2, 1, 8);
+						stride2, 0, 8);
 
 	stop_comp_timer();
 
@@ -1215,7 +1229,6 @@
 	uint32_t x, y;
 	VECTOR mv;
 	const VECTOR zeromv = {0,0};
-	const int64_t TRB = dec->time_pp - dec->time_bp, TRD = dec->time_pp;
 	int i;
 
 	start_timer();
@@ -1310,14 +1323,15 @@
 
 			case MODE_DIRECT_NONE_MV:
 				for (i = 0; i < 4; i++) {
-					mb->mvs[i].x = (int32_t) ((TRB * last_mb->mvs[i].x) / TRD + mv.x);
-					mb->b_mvs[i].x = (int32_t) ((mv.x == 0)
-									? ((TRB - TRD) * last_mb->mvs[i].x) / TRD
-									: mb->mvs[i].x - last_mb->mvs[i].x);
-					mb->mvs[i].y = (int32_t) ((TRB * last_mb->mvs[i].y) / TRD + mv.y);
-					mb->b_mvs[i].y = (int32_t) ((mv.y == 0)
-									? ((TRB - TRD) * last_mb->mvs[i].y) / TRD
-									: mb->mvs[i].y - last_mb->mvs[i].y);
+					mb->mvs[i].x = last_mb->mvs[i].x*dec->time_bp/dec->time_pp + mv.x;
+					mb->mvs[i].y = last_mb->mvs[i].y*dec->time_bp/dec->time_pp + mv.y;
+					
+					mb->b_mvs[i].x = (mv.x)
+						?  mb->mvs[i].x - last_mb->mvs[i].x
+						: last_mb->mvs[i].x*(dec->time_bp - dec->time_pp)/dec->time_pp;
+					mb->b_mvs[i].y = (mv.y)
+						? mb->mvs[i].y - last_mb->mvs[i].y
+						: last_mb->mvs[i].y*(dec->time_bp - dec->time_pp)/dec->time_pp;
 				}
 
 				decoder_bf_interpolate_mbinter(dec, dec->refn[1], dec->refn[0],
@@ -1393,7 +1407,6 @@
 	}
 }
 
-
 int
 decoder_decode(DECODER * dec,
 				xvid_dec_frame_t * frame, xvid_dec_stats_t * stats)
@@ -1490,6 +1503,11 @@
 		goto repeat;
 	}
 
+	if(dec->frames == 0 && coding_type != I_VOP) {
+		/* 1st frame is not an i-vop */
+		goto repeat;
+	}
+
 	dec->p_bmv.x = dec->p_bmv.y = dec->p_fmv.y = dec->p_fmv.y = 0;	/* init pred vector to 0 */
 
 	/* packed_mode: special-N_VOP treament */
@@ -1551,7 +1569,7 @@
 
 		if (dec->low_delay) {
 			DPRINTF(XVID_DEBUG_ERROR, "warning: bvop found in low_delay==1 stream\n");
-			dec->low_delay = 1;
+			dec->low_delay = 0;
 		}
 
 		if (dec->frames < 2) {