--- estimation_rd_based.c	2003/09/28 16:12:32	1.1.2.2
+++ estimation_rd_based.c	2003/11/30 16:13:16	1.1.2.11
@@ -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: estimation_rd_based.c,v 1.1.2.2 2003/09/28 16:12:32 syskin Exp $
+ * $Id: estimation_rd_based.c,v 1.1.2.11 2003/11/30 16:13:16 edgomez Exp $
  *
  ****************************************************************************/
 
@@ -40,8 +40,7 @@
 #include "motion.h"
 #include "sad.h"
 #include "../bitstream/zigzag.h"
-#include "../quant/quant_mpeg4.h"
-#include "../quant/quant_h263.h"
+#include "../quant/quant.h"
 #include "../bitstream/vlc_codes.h"
 #include "../dct/fdct.h"
 #include "motion_inlines.h"
@@ -55,88 +54,135 @@
 				int16_t * const dqcoeff,
 				const uint32_t quant, const int quant_type,
 				uint32_t * cbp,
-				const int block)
+				const int block,
+				const uint16_t * scan_table,
+				const uint16_t * mpeg_quant_matrices)
 {
 	int sum;
 	int bits;
 	int distortion = 0;
-	int i;
 
 	fdct(data);
 
-	if (quant_type) sum = quant_inter(coeff, data, quant);
-	else sum = quant4_inter(coeff, data, quant);
+	if (quant_type) sum = quant_h263_inter(coeff, data, quant, mpeg_quant_matrices);
+	else sum = quant_mpeg_inter(coeff, data, quant, mpeg_quant_matrices);
 
 	if (sum > 0) {
 		*cbp |= 1 << (5 - block);
-		bits = BITS_MULT * CodeCoeffInter_CalcBits(coeff, scan_tables[0]);
-
-		if (quant_type) dequant_inter(dqcoeff, coeff, quant);
-		else dequant4_inter(dqcoeff, coeff, quant);
+		bits = BITS_MULT * CodeCoeffInter_CalcBits(coeff, scan_table);
 
-		for (i = 0; i < 64; i++)
-			distortion += (data[i] - dqcoeff[i])*(data[i] - dqcoeff[i]);
+		if (quant_type) dequant_h263_inter(dqcoeff, coeff, quant, mpeg_quant_matrices);
+		else dequant_mpeg_inter(dqcoeff, coeff, quant, mpeg_quant_matrices);
 
+		distortion = sse8_16bit(data, dqcoeff, 8*sizeof(int16_t));
 	} else {
+		const static int16_t zero_block[64] =
+			{
+				0, 0, 0, 0, 0, 0, 0, 0,
+				0, 0, 0, 0, 0, 0, 0, 0,
+				0, 0, 0, 0, 0, 0, 0, 0,
+				0, 0, 0, 0, 0, 0, 0, 0,
+				0, 0, 0, 0, 0, 0, 0, 0,
+				0, 0, 0, 0, 0, 0, 0, 0,
+				0, 0, 0, 0, 0, 0, 0, 0,
+				0, 0, 0, 0, 0, 0, 0, 0,
+			};
 		bits = 0;
-		for (i = 0; i < 64; i++)
-			distortion += data[i]*data[i];
+		distortion = sse8_16bit(data, zero_block, 8*sizeof(int16_t));
 	}
 
+
 	return bits + (LAMBDA*distortion)/(quant*quant);
 }
 
 static __inline unsigned int
-Block_CalcBitsIntra(int16_t * const coeff,
-					int16_t * const data,
-					int16_t * const dqcoeff,
-					const uint32_t quant, const int quant_type,
-					uint32_t * cbp,
-					const int block,
-					int * dcpred)
+Block_CalcBitsIntra(MACROBLOCK * pMB,
+					const unsigned int x,
+					const unsigned int y,
+					const unsigned int mb_width,
+					const uint32_t block,
+					int16_t coeff[64],
+					int16_t qcoeff[64],
+					int16_t dqcoeff[64],
+					int16_t predictors[8],
+					const uint32_t quant,
+					const int quant_type,
+					unsigned int bits[2],
+					unsigned int cbp[2],
+					const uint16_t * mpeg_quant_matrices)
 {
-	int bits, i;
-	int distortion = 0;
-	uint32_t iDcScaler = get_dc_scaler(quant, block < 4);
-	int b_dc;
-
-	fdct(data);
-	data[0] -= 1024;
+	int direction;
+	int16_t *pCurrent;
+	unsigned int i, coded;
+	unsigned int distortion = 0;
+	const uint32_t iDcScaler = get_dc_scaler(quant, block < 4);
+
+	fdct(coeff);
+
+	if (quant_type) {
+		quant_h263_intra(qcoeff, coeff, quant, iDcScaler, mpeg_quant_matrices);
+		dequant_h263_intra(dqcoeff, qcoeff, quant, iDcScaler, mpeg_quant_matrices);
+	} else {
+		quant_mpeg_intra(qcoeff, coeff, quant, iDcScaler, mpeg_quant_matrices);
+		dequant_mpeg_intra(dqcoeff, qcoeff, quant, iDcScaler, mpeg_quant_matrices);
+	}
 
-	if (quant_type) quant_intra(coeff, data, quant, iDcScaler);
-	else quant4_intra(coeff, data, quant, iDcScaler);
+	predict_acdc(pMB-(x+mb_width*y), x, y, mb_width, block, qcoeff,
+				quant, iDcScaler, predictors, 0);
+	
+	direction = pMB->acpred_directions[block];
+	pCurrent = pMB->pred_values[block];
 
-	b_dc = coeff[0];
-	if (block < 4) {
-		coeff[0] -= *dcpred;
-		*dcpred = b_dc;
+	/* store current coeffs to pred_values[] for future prediction */
+	pCurrent[0] = qcoeff[0] * iDcScaler;
+	for (i = 1; i < 8; i++) {
+		pCurrent[i] = qcoeff[i];
+		pCurrent[i + 7] = qcoeff[i * 8];
 	}
 
-	bits = BITS_MULT*CodeCoeffIntra_CalcBits(coeff, scan_tables[0]);
-	if (bits != 0) *cbp |= 1 << (5 - block);
+	/* dc prediction */
+	qcoeff[0] = qcoeff[0] - predictors[0];
+
+	if (block < 4) bits[1] = bits[0] = dcy_tab[qcoeff[0] + 255].len;
+	else bits[1] = bits[0] = dcc_tab[qcoeff[0] + 255].len;
 
-	if (block < 4) bits += BITS_MULT*dcy_tab[coeff[0] + 255].len;
-	else bits += BITS_MULT*dcc_tab[coeff[0] + 255].len;
+	/* calc cost before ac prediction */
+	bits[0] += coded = CodeCoeffIntra_CalcBits(qcoeff, scan_tables[0]);
+	if (coded > 0) cbp[0] |= 1 << (5 - block);
 
-	coeff[0] = b_dc;
-	if (quant_type) dequant_intra(dqcoeff, coeff, quant, iDcScaler);
-	else dequant4_intra(dqcoeff, coeff, quant, iDcScaler);
+	/* apply ac prediction & calc cost*/
+	if (direction == 1) {
+		for (i = 1; i < 8; i++) {
+			qcoeff[i] -= predictors[i];
+			predictors[i] = qcoeff[i];
+		}
+	} else {						/* acpred_direction == 2 */
+		for (i = 1; i < 8; i++) {
+			qcoeff[i*8] -= predictors[i];
+			predictors[i] = qcoeff[i*8];
+		}
+	}
 
-	for (i = 0; i < 64; i++)
-		distortion += (data[i] - dqcoeff[i])*(data[i] - dqcoeff[i]);
+	bits[1] += coded = CodeCoeffIntra_CalcBits(qcoeff, scan_tables[direction]);
+	if (coded > 0) cbp[1] |= 1 << (5 - block);
 
-	return bits + (LAMBDA*distortion)/(quant*quant);
+	distortion = sse8_16bit(coeff, dqcoeff, 8*sizeof(int16_t));
+
+	return (LAMBDA*distortion)/(quant*quant);
 }
 
+
+
 static void
-CheckCandidateRD16(const int x, const int y, const SearchData * const data, const unsigned int Direction)
+CheckCandidateRD16(const int x, const int y, SearchData * const data, const unsigned int Direction)
 {
 
 	int16_t *in = data->dctSpace, *coeff = data->dctSpace + 64;
 	int32_t rd = 0;
 	VECTOR * current;
 	const uint8_t * ptr;
-	int i, cbp = 0, t, xc, yc;
+	int i, t, xc, yc;
+	unsigned cbp = 0;
 
 	if ( (x > data->max_dx) || (x < data->min_dx)
 		|| (y > data->max_dy) || (y < data->min_dy) ) return;
@@ -154,7 +200,7 @@
 	for(i = 0; i < 4; i++) {
 		int s = 8*((i&1) + (i>>1)*data->iEdgedWidth);
 		transfer_8to16subro(in, data->Cur + s, ptr + s, data->iEdgedWidth);
-		rd += data->temp[i] = Block_CalcBits(coeff, in, data->dctSpace + 128, data->iQuant, data->quant_type, &cbp, i);
+		rd += data->temp[i] = Block_CalcBits(coeff, in, data->dctSpace + 128, data->iQuant, data->quant_type, &cbp, i, data->scan_table, data->mpeg_quant_matrices);
 	}
 
 	rd += t = BITS_MULT*d_mv_bits(x, y, data->predMV, data->iFcode, data->qpel^data->qpel_precision, 0);
@@ -179,33 +225,33 @@
 	/* chroma U */
 	ptr = interpolate8x8_switch2(data->RefQ, data->RefP[4], 0, 0, xc, yc, data->iEdgedWidth/2, data->rounding);
 	transfer_8to16subro(in, data->CurU, ptr, data->iEdgedWidth/2);
-	rd += Block_CalcBits(coeff, in, data->dctSpace + 128, data->iQuant, data->quant_type, &cbp, 4);
+	rd += Block_CalcBits(coeff, in, data->dctSpace + 128, data->iQuant, data->quant_type, &cbp, 4, data->scan_table, data->mpeg_quant_matrices);
 	if (rd >= data->iMinSAD[0]) return;
 
 	/* chroma V */
 	ptr = interpolate8x8_switch2(data->RefQ, data->RefP[5], 0, 0, xc, yc, data->iEdgedWidth/2, data->rounding);
 	transfer_8to16subro(in, data->CurV, ptr, data->iEdgedWidth/2);
-	rd += Block_CalcBits(coeff, in, data->dctSpace + 128, data->iQuant, data->quant_type, &cbp, 5);
+	rd += Block_CalcBits(coeff, in, data->dctSpace + 128, data->iQuant, data->quant_type, &cbp, 5, data->scan_table, data->mpeg_quant_matrices);
 
 	rd += BITS_MULT*mcbpc_inter_tab[(MODE_INTER & 7) | ((cbp & 3) << 3)].len;
 
 	if (rd < data->iMinSAD[0]) {
 		data->iMinSAD[0] = rd;
 		current[0].x = x; current[0].y = y;
-		*data->dir = Direction;
+		data->dir = Direction;
 		*data->cbp = cbp;
 	}
 }
 
 static void
-CheckCandidateRD8(const int x, const int y, const SearchData * const data, const unsigned int Direction)
+CheckCandidateRD8(const int x, const int y, SearchData * const data, const unsigned int Direction)
 {
 
 	int16_t *in = data->dctSpace, *coeff = data->dctSpace + 64;
 	int32_t rd;
 	VECTOR * current;
 	const uint8_t * ptr;
-	int cbp = 0;
+	unsigned int cbp = 0;
 
 	if ( (x > data->max_dx) || (x < data->min_dx)
 		|| (y > data->max_dy) || (y < data->min_dy) ) return;
@@ -219,14 +265,14 @@
 	}
 
 	transfer_8to16subro(in, data->Cur, ptr, data->iEdgedWidth);
-	rd = Block_CalcBits(coeff, in, data->dctSpace + 128, data->iQuant, data->quant_type, &cbp, 5);
+	rd = Block_CalcBits(coeff, in, data->dctSpace + 128, data->iQuant, data->quant_type, &cbp, 5, data->scan_table, data->mpeg_quant_matrices);
 	rd += BITS_MULT*d_mv_bits(x, y, data->predMV, data->iFcode, data->qpel^data->qpel_precision, 0);
 
 	if (rd < data->iMinSAD[0]) {
 		*data->cbp = cbp;
 		data->iMinSAD[0] = rd;
 		current[0].x = x; current[0].y = y;
-		*data->dir = Direction;
+		data->dir = Direction;
 	}
 }
 
@@ -293,14 +339,14 @@
 }
 
 static int
-findRD_inter4v(const SearchData * const Data,
+findRD_inter4v(SearchData * const Data,
 				MACROBLOCK * const pMB, const MACROBLOCK * const pMBs,
 				const int x, const int y,
 				const MBParam * const pParam, const uint32_t MotionFlags,
 				const VECTOR * const backup)
 {
 
-	int cbp = 0, bits = 0, t = 0, i;
+	unsigned int cbp = 0, bits = 0, t = 0, i;
 	SearchData Data2, *Data8 = &Data2;
 	int sumx = 0, sumy = 0;
 	int16_t *in = Data->dctSpace, *coeff = Data->dctSpace + 64;
@@ -310,15 +356,15 @@
 
 	for (i = 0; i < 4; i++) { /* for all luma blocks */
 
-		Data8->iMinSAD = Data->iMinSAD + i + 1;
-		Data8->currentMV = Data->currentMV + i + 1;
-		Data8->currentQMV = Data->currentQMV + i + 1;
+		*Data8->iMinSAD = *(Data->iMinSAD + i + 1);
+		*Data8->currentMV = *(Data->currentMV + i + 1);
+		*Data8->currentQMV = *(Data->currentQMV + i + 1);
 		Data8->Cur = Data->Cur + 8*((i&1) + (i>>1)*Data->iEdgedWidth);
 		Data8->RefP[0] = Data->RefP[0] + 8*((i&1) + (i>>1)*Data->iEdgedWidth);
 		Data8->RefP[2] = Data->RefP[2] + 8*((i&1) + (i>>1)*Data->iEdgedWidth);
 		Data8->RefP[1] = Data->RefP[1] + 8*((i&1) + (i>>1)*Data->iEdgedWidth);
 		Data8->RefP[3] = Data->RefP[3] + 8*((i&1) + (i>>1)*Data->iEdgedWidth);
-		*Data8->cbp = (Data->cbp[1] & (1<<(5-i))) ? 1:0; // copy corresponding cbp bit
+		*Data8->cbp = (Data->cbp[1] & (1<<(5-i))) ? 1:0; /* copy corresponding cbp bit */
 
 		if(Data->qpel) {
 			Data8->predMV = get_qpmv2(pMBs, pParam->mb_width, 0, x, y, i);
@@ -421,14 +467,14 @@
 	/* chroma U */
 	ptr = interpolate8x8_switch2(Data->RefQ + 64, Data->RefP[4], 0, 0, sumx, sumy, Data->iEdgedWidth/2, Data->rounding);
 	transfer_8to16subro(in, Data->CurU, ptr, Data->iEdgedWidth/2);
-	bits += Block_CalcBits(coeff, in, Data->dctSpace + 128, Data->iQuant, Data->quant_type, &cbp, 4);
+	bits += Block_CalcBits(coeff, in, Data->dctSpace + 128, Data->iQuant, Data->quant_type, &cbp, 4, Data->scan_table, Data->mpeg_quant_matrices);
 
 	if (bits >= *Data->iMinSAD) return bits;
 
 	/* chroma V */
 	ptr = interpolate8x8_switch2(Data->RefQ + 64, Data->RefP[5], 0, 0, sumx, sumy, Data->iEdgedWidth/2, Data->rounding);
 	transfer_8to16subro(in, Data->CurV, ptr, Data->iEdgedWidth/2);
-	bits += Block_CalcBits(coeff, in, Data->dctSpace + 128, Data->iQuant, Data->quant_type, &cbp, 5);
+	bits += Block_CalcBits(coeff, in, Data->dctSpace + 128, Data->iQuant, Data->quant_type, &cbp, 5, Data->scan_table, Data->mpeg_quant_matrices);
 
 	bits += BITS_MULT*mcbpc_inter_tab[(MODE_INTER4V & 7) | ((cbp & 3) << 3)].len;
 
@@ -437,48 +483,72 @@
 }
 
 static int
-findRD_intra(const SearchData * const Data)
+findRD_intra(SearchData * const Data, MACROBLOCK * pMB,
+			 const int x, const int y, const int mb_width)
 {
-	int bits = BITS_MULT*1; /* this one is ac/dc prediction flag bit */
-	int cbp = 0, i, dc = 0;
-	int16_t *in = Data->dctSpace, * coeff = Data->dctSpace + 64;
+	unsigned int cbp[2] = {0, 0}, bits[2], i;
+	unsigned int bits1 = BITS_MULT*1, bits2 = BITS_MULT*1; /* this one is ac/dc prediction flag bit */
+	unsigned int distortion = 0;
+
+	int16_t *in = Data->dctSpace, * coeff = Data->dctSpace + 64, * dqcoeff = Data->dctSpace + 128;
+	const uint32_t iQuant = Data->iQuant;
+	int16_t predictors[6][8];
 
 	for(i = 0; i < 4; i++) {
 		int s = 8*((i&1) + (i>>1)*Data->iEdgedWidth);
 		transfer_8to16copy(in, Data->Cur + s, Data->iEdgedWidth);
-		bits += Block_CalcBitsIntra(coeff, in, Data->dctSpace + 128, Data->iQuant, Data->quant_type, &cbp, i, &dc);
+		
 
-		if (bits >= Data->iMinSAD[0]) return bits;
+		distortion = Block_CalcBitsIntra(pMB, x, y, mb_width, i, in, coeff, dqcoeff,
+								predictors[i], iQuant, Data->quant_type, bits, cbp, Data->mpeg_quant_matrices);
+		bits1 += distortion + BITS_MULT * bits[0];
+		bits2 += distortion + BITS_MULT * bits[1];
+
+		if (bits1 >= Data->iMinSAD[0] && bits2 >= Data->iMinSAD[0]) 
+			return bits1;
 	}
 
-	bits += BITS_MULT*xvid_cbpy_tab[cbp>>2].len;
+	bits1 += BITS_MULT*xvid_cbpy_tab[cbp[0]>>2].len;
+	bits2 += BITS_MULT*xvid_cbpy_tab[cbp[1]>>2].len;
 
 	/*chroma U */
 	transfer_8to16copy(in, Data->CurU, Data->iEdgedWidth/2);
-	bits += Block_CalcBitsIntra(coeff, in, Data->dctSpace + 128, Data->iQuant, Data->quant_type, &cbp, 4, &dc);
+	distortion = Block_CalcBitsIntra(pMB, x, y, mb_width, 4, in, coeff, dqcoeff,
+									predictors[4], iQuant, Data->quant_type, bits, cbp, Data->mpeg_quant_matrices);
+	bits1 += distortion + BITS_MULT * bits[0];
+	bits2 += distortion + BITS_MULT * bits[1];
 
-	if (bits >= Data->iMinSAD[0]) return bits;
+	if (bits1 >= Data->iMinSAD[0] && bits2 >= Data->iMinSAD[0]) 
+		return bits1;
 
 	/* chroma V */
 	transfer_8to16copy(in, Data->CurV, Data->iEdgedWidth/2);
-	bits += Block_CalcBitsIntra(coeff, in, Data->dctSpace + 128, Data->iQuant, Data->quant_type, &cbp, 5, &dc);
+	distortion = Block_CalcBitsIntra(pMB, x, y, mb_width, 5, in, coeff, dqcoeff,
+									predictors[5], iQuant, Data->quant_type, bits, cbp, Data->mpeg_quant_matrices);
 
-	bits += BITS_MULT*mcbpc_inter_tab[(MODE_INTRA & 7) | ((cbp & 3) << 3)].len;
+	bits1 += distortion + BITS_MULT * bits[0];
+	bits2 += distortion + BITS_MULT * bits[1];
 
-	return bits;
+	bits1 += BITS_MULT*mcbpc_inter_tab[(MODE_INTRA & 7) | ((cbp[0] & 3) << 3)].len;
+	bits2 += BITS_MULT*mcbpc_inter_tab[(MODE_INTRA & 7) | ((cbp[1] & 3) << 3)].len;
+
+	*Data->cbp = bits1 <= bits2 ? cbp[0] : cbp[1];
+
+	return MIN(bits1, bits2);
 }
 
+
 static int
-findRD_gmc(const SearchData * const Data, const IMAGE * const vGMC, const int x, const int y)
+findRD_gmc(SearchData * const Data, const IMAGE * const vGMC, const int x, const int y)
 {
 	int bits = BITS_MULT*1; /* this one is mcsel */
-	int cbp = 0, i;
+	unsigned int cbp = 0, i;
 	int16_t *in = Data->dctSpace, * coeff = Data->dctSpace + 64;
 
 	for(i = 0; i < 4; i++) {
 		int s = 8*((i&1) + (i>>1)*Data->iEdgedWidth);
 		transfer_8to16subro(in, Data->Cur + s, vGMC->y + s + 16*(x+y*Data->iEdgedWidth), Data->iEdgedWidth);
-		bits += Block_CalcBits(coeff, in, Data->dctSpace + 128, Data->iQuant, Data->quant_type, &cbp, i);
+		bits += Block_CalcBits(coeff, in, Data->dctSpace + 128, Data->iQuant, Data->quant_type, &cbp, i, Data->scan_table, Data->mpeg_quant_matrices);
 		if (bits >= Data->iMinSAD[0]) return bits;
 	}
 
@@ -486,13 +556,13 @@
 
 	/*chroma U */
 	transfer_8to16subro(in, Data->CurU, vGMC->u + 8*(x+y*(Data->iEdgedWidth/2)), Data->iEdgedWidth/2);
-	bits += Block_CalcBits(coeff, in, Data->dctSpace + 128, Data->iQuant, Data->quant_type, &cbp, 4);
+	bits += Block_CalcBits(coeff, in, Data->dctSpace + 128, Data->iQuant, Data->quant_type, &cbp, 4, Data->scan_table, Data->mpeg_quant_matrices);
 
 	if (bits >= Data->iMinSAD[0]) return bits;
 
 	/* chroma V */
 	transfer_8to16subro(in, Data->CurV , vGMC->v + 8*(x+y*(Data->iEdgedWidth/2)), Data->iEdgedWidth/2);
-	bits += Block_CalcBits(coeff, in, Data->dctSpace + 128, Data->iQuant, Data->quant_type, &cbp, 5);
+	bits += Block_CalcBits(coeff, in, Data->dctSpace + 128, Data->iQuant, Data->quant_type, &cbp, 5, Data->scan_table, Data->mpeg_quant_matrices);
 
 	bits += BITS_MULT*mcbpc_inter_tab[(MODE_INTER & 7) | ((cbp & 3) << 3)].len;
 
@@ -520,10 +590,11 @@
 	int inter4v = (VopFlags & XVID_VOP_INTER4V) && (pMB->dquant == 0);
 	const uint32_t iQuant = pMB->quant;
 
-	int min_rd, intra_rd, i, cbp, c[2] = {0, 0};
+	int min_rd, intra_rd, i, cbp;
 	VECTOR backup[5], *v;
 	Data->iQuant = iQuant;
-	Data->cbp = c;
+	Data->scan_table = VopFlags & XVID_VOP_ALTERNATESCAN ?
+						scan_tables[2] : scan_tables[0];
 
 	pMB->mcsel = 0;
 
@@ -558,10 +629,11 @@
 		}
 	}
 
-	intra_rd = findRD_intra(Data);
+	intra_rd = findRD_intra(Data, pMB, x, y, pParam->mb_width);
 	if (intra_rd < min_rd) {
 		*Data->iMinSAD = min_rd = intra_rd;
 		mode = MODE_INTRA;
+		cbp = *Data->cbp;
 	}
 
 	pMB->sad16 = pMB->sad8[0] = pMB->sad8[1] = pMB->sad8[2] = pMB->sad8[3] = 0;
@@ -586,7 +658,7 @@
 			pMB->pmvs[0].y = Data->currentMV[0].y - Data->predMV.y;
 		}
 
-	} else if (mode == MODE_INTER ) { // but mcsel == 1
+	} else if (mode == MODE_INTER ) { /* but mcsel == 1 */
 
 		pMB->mcsel = 1;
 		if (Data->qpel) {
@@ -623,13 +695,15 @@
 	int inter4v = (VopFlags & XVID_VOP_INTER4V) && (pMB->dquant == 0);
 	const uint32_t iQuant = pMB->quant;
 	const int skip_possible = (coding_type == P_VOP) && (pMB->dquant == 0);
-    int sad; 
-	int min_rd = -1, intra_rd, i, cbp = 63, c[2] = {0, 0};
+    int sad;
+	int min_rd = -1, intra_rd, i, cbp = 63;
 	VECTOR backup[5], *v;
 	int sad_backup[5];
 	int InterBias = MV16_INTER_BIAS;
 	int thresh = 0;
 	int top = 0, top_right = 0, left = 0;
+	Data->scan_table = VopFlags & XVID_VOP_ALTERNATESCAN ?
+						scan_tables[2] : scan_tables[0];
 
 	pMB->mcsel = 0;
 
@@ -676,7 +750,6 @@
 		}
 	} else { /* Rate-Distortion INTER<->INTER4V */
 		Data->iQuant = iQuant;
-		Data->cbp = c;
 		v = Data->qpel ? Data->currentQMV : Data->currentMV;
 
 		/* final skip decision, a.k.a. "the vector you found, really that good?" */
@@ -734,9 +807,9 @@
 	thresh = 0;
 
 	if((x > 0) && (y > 0) && (x < (int32_t) pParam->mb_width)) {
-		left = (&pMBs[(x-1) + y * pParam->mb_width])->sad16; // left
-		top = (&pMBs[x + (y-1) * pParam->mb_width])->sad16; // top
-		top_right = (&pMBs[(x+1) + (y-1) * pParam->mb_width])->sad16; // top right
+		left = (&pMBs[(x-1) + y * pParam->mb_width])->sad16; /* left */
+		top = (&pMBs[x + (y-1) * pParam->mb_width])->sad16; /* top */
+		top_right = (&pMBs[(x+1) + (y-1) * pParam->mb_width])->sad16; /* top right */
 
 		if(((&pMBs[(x-1) + y * pParam->mb_width])->mode != MODE_INTRA) &&
 		   ((&pMBs[x + (y-1) * pParam->mb_width])->mode != MODE_INTRA) &&
@@ -777,7 +850,6 @@
 	} else { /* Rate-Distortion INTRA<->INTER */
 		if(min_rd < 0) {
 			Data->iQuant = iQuant;
-			Data->cbp = c;
 			v = Data->qpel ? Data->currentQMV : Data->currentMV;
 
 			for (i = 0; i < 5; i++) {
@@ -814,7 +886,7 @@
 			}
 		}
 
-		intra_rd = findRD_intra(Data);
+		intra_rd = findRD_intra(Data, pMB, x, y, pParam->mb_width);
 		if (intra_rd < min_rd) {
 			*Data->iMinSAD = min_rd = intra_rd;
 			mode = MODE_INTRA;
@@ -844,7 +916,7 @@
 			pMB->pmvs[0].y = Data->currentMV[0].y - Data->predMV.y;
 		}
 
-	} else if (mode == MODE_INTER ) { // but mcsel == 1
+	} else if (mode == MODE_INTER ) { /* but mcsel == 1 */
 
 		pMB->mcsel = 1;
 		if (Data->qpel) {