--- estimation_bvop.c	2004/07/18 11:48:08	1.10
+++ estimation_bvop.c	2004/07/21 15:47:51	1.13
@@ -21,7 +21,7 @@
  *  along with this program ; if not, write to the Free Software
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  *
- * $Id: estimation_bvop.c,v 1.10 2004/07/18 11:48:08 syskin Exp $
+ * $Id: estimation_bvop.c,v 1.13 2004/07/21 15:47:51 syskin Exp $
  *
  ****************************************************************************/
 
@@ -375,8 +375,7 @@
 	Data_d->CurU = Data_f->CurU = Data_b->CurU = Data_i->CurU = Cur[1];
 	Data_d->CurV = Data_f->CurV = Data_b->CurV = Data_i->CurV = Cur[2];
 
-	Data_d->lambda16 = lambda;
-	Data_f->lambda16 = Data_b->lambda16 = Data_i->lambda16 = lambda;
+	Data_d->lambda16 = Data_f->lambda16 = Data_b->lambda16 = Data_i->lambda16 = lambda;
 
 	/* reset chroma-sad cache */
 	Data_d->b_chromaX = Data_d->b_chromaY = Data_d->chromaX = Data_d->chromaY = Data_d->chromaSAD = 256*4096; 
@@ -401,11 +400,9 @@
 							const uint32_t mode_curr,
 							const VECTOR hint)
 {
-
 	/* [0] is prediction */
-	pmv[0].x = (pmv[0].x); pmv[0].y = (pmv[0].y);
-
-	pmv[1].x = pmv[1].y = 0; /* [1] is zero */
+	/* [1] is zero */
+	pmv[1].x = pmv[1].y = 0; 
 
 	pmv[2].x = hint.x; pmv[2].y = hint.y;
 
@@ -525,8 +522,6 @@
 {
 	int k;
 
-	pMB->mode = MODE_DIRECT; /* just to initialize it */
-
 	if (!Data->chroma) {
 		int dx = 0, dy = 0, b_dx = 0, b_dy = 0;
 		int32_t sum;
@@ -569,6 +564,10 @@
 	for (k = 0; k < 4; k++) {
 		pMB->qmvs[k] = pMB->mvs[k] = Data->directmvF[k];
 		pMB->b_qmvs[k] = pMB->b_mvs[k] =  Data->directmvB[k];
+		if (Data->qpel) {
+			pMB->mvs[k].x /= 2; pMB->mvs[k].y /= 2; /* it's a hint for future searches */
+			pMB->b_mvs[k].x /= 2; pMB->b_mvs[k].y /= 2;
+		}
 	}
 }
 
@@ -617,7 +616,6 @@
 
 	CheckCandidateDirect(0, 0, Data, 255);	/* will also fill iMinSAD[1..4] with 8x8 SADs */
 
-
 	/* initial (fast) skip decision */
 	if (Data->iMinSAD[1] < (int)Data->iQuant * INITIAL_SKIP_THRESH
 		&& Data->iMinSAD[2] < (int)Data->iQuant * INITIAL_SKIP_THRESH
@@ -629,8 +627,10 @@
 			return *Data->iMinSAD; /* skipped */
 	}
 
-	skip_sad = 4*MAX(MAX(Data->iMinSAD[1],Data->iMinSAD[2]), MAX(Data->iMinSAD[3],Data->iMinSAD[4]));
-	if (Data->chroma) skip_sad += Data->chromaSAD;
+	if (Data->chroma && Data->chromaSAD >= MAX_CHROMA_SAD_FOR_SKIP * (int)Data->iQuant) /* chroma doesn't allow skip */
+		skip_sad = 256*4096;
+	else
+		skip_sad = 4*MAX(MAX(Data->iMinSAD[1],Data->iMinSAD[2]), MAX(Data->iMinSAD[3],Data->iMinSAD[4]));
 
 	Data->currentMV[1].x = Data->directmvF[0].x + Data->currentMV->x; /* hints for forward and backward searches */
 	Data->currentMV[1].y = Data->directmvF[0].y + Data->currentMV->y;
@@ -875,6 +875,7 @@
 			*f_predMV = Data_f->currentMV[0];
 		}
 		pMB->mvs[0] = *Data_f->currentMV;
+		pMB->b_mvs[0] = *Data_b->currentMV; /* hint for future searches */
 		break;
 
 	case MODE_BACKWARD:
@@ -889,6 +890,7 @@
 			*b_predMV = Data_b->currentMV[0];
 		}
 		pMB->b_mvs[0] = *Data_b->currentMV;
+		pMB->mvs[0] = *Data_f->currentMV; /* hint for future searches */
 		break;
 
 
@@ -1001,7 +1003,7 @@
 				pMB->sad16 = best_sad;
 				continue;
 			}
-			
+
 			SearchBF_initial(i, j, frame->motion_flags, frame->fcode, pParam, pMB,
 						&f_predMV, &best_sad, MODE_FORWARD, &Data_f, Data_d.currentMV[1]);
 
@@ -1027,14 +1029,16 @@
 			if ((Data_d.iMinSAD[0] <= 2*best_sad) && (!frame->motion_flags&XVID_ME_SKIP_DELTASEARCH))
 				SearchDirect_final(frame->motion_flags, b_mb, &best_sad, &Data_d);
 
-
 			/* final skip decision */
-			if ( (skip_sad < Data_d.iQuant * MAX_SAD00_FOR_SKIP )
+			if ( (skip_sad < 2 * Data_d.iQuant * MAX_SAD00_FOR_SKIP )
 				&& ((100*best_sad)/(skip_sad+1) > FINAL_SKIP_THRESH) ) {
 
+				Data_d.chromaSAD = 0; /* green light for chroma check */
+
 				SkipDecisionB(pMB, &Data_d);
+				
 				if (pMB->mode == MODE_DIRECT_NONE_MV) { /* skipped? */
-					pMB->sad16 = best_sad;
+					pMB->sad16 = skip_sad;
 					continue;
 				}
 			}