[svn] / branches / dev-api-4 / xvidcore / src / utils / mbtransquant.c Repository:
ViewVC logotype

View of /branches/dev-api-4/xvidcore/src/utils/mbtransquant.c

Parent Directory Parent Directory | Revision Log Revision Log


Revision 1095 - (download) (annotate)
Thu Jul 24 13:09:27 2003 UTC (15 years, 10 months ago) by Isibaar
File size: 39842 byte(s)
cartoon mode
/*****************************************************************************
 *
 *  XVID MPEG-4 VIDEO CODEC
 *  - MB Transfert/Quantization functions -
 *
 *  Copyright(C) 2001-2003  Peter Ross <pross@xvid.org>
 *               2001-2003  Michael Militzer <isibaar@xvid.org>
 *               2003       Edouard Gomez <ed.gomez@free.fr>
 *
 *  This program is free software ; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation ; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY ; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program ; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 * $Id: mbtransquant.c,v 1.21.2.15 2003-07-24 13:09:14 Isibaar Exp $
 *
 ****************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "../portab.h"
#include "mbfunctions.h"

#include "../global.h"
#include "mem_transfer.h"
#include "timer.h"
#include "../bitstream/mbcoding.h"
#include "../bitstream/zigzag.h"
#include "../dct/fdct.h"
#include "../dct/idct.h"
#include "../quant/quant_mpeg4.h"
#include "../quant/quant_h263.h"
#include "../encoder.h"

#include "../image/reduced.h"

MBFIELDTEST_PTR MBFieldTest;

/*
 * Skip blocks having a coefficient sum below this value. This value will be
 * corrected according to the MB quantizer to avoid artifacts for quant==1
 */
#define PVOP_TOOSMALL_LIMIT 1
#define BVOP_TOOSMALL_LIMIT 3

/*****************************************************************************
 * Local functions
 ****************************************************************************/

/* permute block and return field dct choice */
static __inline uint32_t
MBDecideFieldDCT(int16_t data[6 * 64])
{
	uint32_t field = MBFieldTest(data);

	if (field)
		MBFrameToField(data);

	return field;
}

/* Performs Forward DCT on all blocks */
static __inline void
MBfDCT(const MBParam * const pParam,
	   const FRAMEINFO * const frame,
	   MACROBLOCK * const pMB,
	   uint32_t x_pos,
	   uint32_t y_pos,
	   int16_t data[6 * 64])
{
	/* Handles interlacing */
	start_timer();
	pMB->field_dct = 0;
	if ((frame->vol_flags & XVID_VOL_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();

	/* Perform DCT */
	start_timer();
	fdct(&data[0 * 64]);
	fdct(&data[1 * 64]);
	fdct(&data[2 * 64]);
	fdct(&data[3 * 64]);
	fdct(&data[4 * 64]);
	fdct(&data[5 * 64]);
	stop_dct_timer();
}

/* Performs Inverse DCT on all blocks */
static __inline void
MBiDCT(int16_t data[6 * 64],
	   const uint8_t cbp)
{
	start_timer();
	if(cbp & (1 << (5 - 0))) idct(&data[0 * 64]);
	if(cbp & (1 << (5 - 1))) idct(&data[1 * 64]);
	if(cbp & (1 << (5 - 2))) idct(&data[2 * 64]);
	if(cbp & (1 << (5 - 3))) idct(&data[3 * 64]);
	if(cbp & (1 << (5 - 4))) idct(&data[4 * 64]);
	if(cbp & (1 << (5 - 5))) idct(&data[5 * 64]);
	stop_idct_timer();
}

/* Quantize all blocks -- Intra mode */
static __inline void
MBQuantIntra(const MBParam * pParam,
			 const FRAMEINFO * const frame,
			 const MACROBLOCK * pMB,
			 int16_t qcoeff[6 * 64],
			 int16_t data[6*64])
{
	int i;

	for (i = 0; i < 6; i++) {
		uint32_t iDcScaler = get_dc_scaler(pMB->quant, i < 4);

		/* Quantize the block */
		start_timer();
		if (!(pParam->vol_flags & XVID_VOL_MPEGQUANT)) {
			quant_intra(&data[i * 64], &qcoeff[i * 64], pMB->quant, iDcScaler);
		} else {
			quant4_intra(&data[i * 64], &qcoeff[i * 64], pMB->quant, iDcScaler);
		}
		stop_quant_timer();
	}
}

/* DeQuantize all blocks -- Intra mode */
static __inline void
MBDeQuantIntra(const MBParam * pParam,
			   const int iQuant,
			   int16_t qcoeff[6 * 64],
			   int16_t data[6*64])
{
	int i;

	for (i = 0; i < 6; i++) {
		uint32_t iDcScaler = get_dc_scaler(iQuant, i < 4);

		start_timer();
		if (!(pParam->vol_flags & XVID_VOL_MPEGQUANT))
			dequant_intra(&qcoeff[i * 64], &data[i * 64], iQuant, iDcScaler);
		else
			dequant4_intra(&qcoeff[i * 64], &data[i * 64], iQuant, iDcScaler);
		stop_iquant_timer();
	}
}


static int 
dct_quantize_trellis_h263_c(int16_t *const Out,
							const int16_t *const In,
							int Q,
							const uint16_t * const Zigzag,
							int Non_Zero);

#if 0
static int 
dct_quantize_trellis_mpeg_c(int16_t *const Out,
							const int16_t *const In,
							int Q,
							const uint16_t * const Zigzag,
							int Non_Zero);
#endif

/* Quantize all blocks -- Inter mode */
static __inline uint8_t
MBQuantInter(const MBParam * pParam,
			 const FRAMEINFO * const frame,
			 const MACROBLOCK * pMB,
			 int16_t data[6 * 64],
			 int16_t qcoeff[6 * 64],
			 int bvop,
			 int limit)
{

	int i;
	uint8_t cbp = 0;
	int sum;
	int code_block;

	for (i = 0; i < 6; i++) {

		/* Quantize the block */
		start_timer();
		if (!(pParam->vol_flags & XVID_VOL_MPEGQUANT)) {
			sum = quant_inter(&qcoeff[i*64], &data[i*64], pMB->quant);
			if ( (sum) && (frame->vop_flags & XVID_VOP_TRELLISQUANT) ) {
				sum = dct_quantize_trellis_h263_c(&qcoeff[i*64], &data[i*64], pMB->quant, &scan_tables[0][0], 63)+1;
/*				limit = 1; // Isibaar: why? deactivated so far - so please complain! ;-) */
			}
		} else {
			sum = quant4_inter(&qcoeff[i * 64], &data[i * 64], pMB->quant);
#if 0
			if ( (sum) && (frame->vop_flags & XVID_VOP_TRELLISQUANT) )
				sum = dct_quantize_trellis_mpeg_c (&qcoeff[i*64], &data[i*64], pMB->quant)+1;	
#endif
		}
		stop_quant_timer();

		/*
		 * We code the block if the sum is higher than the limit and if the first
		 * two AC coefficients in zig zag order are not zero.
		 */
		code_block = 0;
		if ((sum >= limit) || (qcoeff[i*64+1] != 0) || (qcoeff[i*64+8] != 0)) {
			code_block = 1;
		} else {

			if (bvop && (pMB->mode == MODE_DIRECT || pMB->mode == MODE_DIRECT_NO4V)) {
				/* dark blocks prevention for direct mode */
				if ((qcoeff[i*64] < -1) || (qcoeff[i*64] > 0))
					code_block = 1;
			} else {
				/* not direct mode */
				if (qcoeff[i*64] != 0)
					code_block = 1;
			}
		}

		/* Set the corresponding cbp bit */
		cbp |= code_block << (5 - i);
	}

	return(cbp);
}

/* DeQuantize all blocks -- Inter mode */
static __inline void
MBDeQuantInter(const MBParam * pParam,
			   const int iQuant,
			   int16_t data[6 * 64],
			   int16_t qcoeff[6 * 64],
			   const uint8_t cbp)
{
	int i;

	for (i = 0; i < 6; i++) {
		if (cbp & (1 << (5 - i))) {
			start_timer();
			if (!(pParam->vol_flags & XVID_VOL_MPEGQUANT))
				dequant_inter(&data[i * 64], &qcoeff[i * 64], iQuant);
			else
				dequant4_inter(&data[i * 64], &qcoeff[i * 64], iQuant);
			stop_iquant_timer();
		}
	}
}

typedef void (transfer_operation_8to16_t) (int16_t *Dst, const uint8_t *Src, int BpS);
typedef void (transfer_operation_16to8_t) (uint8_t *Dst, const int16_t *Src, int BpS);


static __inline void
MBTrans8to16(const MBParam * const pParam,
			 const FRAMEINFO * const frame,
			 const MACROBLOCK * const pMB,
			 const uint32_t x_pos,
			 const uint32_t y_pos,
			 int16_t data[6 * 64])
{
	uint32_t stride = pParam->edged_width;
	uint32_t stride2 = stride / 2;
	uint32_t next_block = stride * 8;
	int32_t cst;
	uint8_t *pY_Cur, *pU_Cur, *pV_Cur;
	const IMAGE * const pCurrent = &frame->image;
	transfer_operation_8to16_t *transfer_op = NULL;

	if ((frame->vop_flags & XVID_VOP_REDUCED)) {

		/* Image pointers */
		pY_Cur = pCurrent->y + (y_pos << 5) * stride  + (x_pos << 5);
		pU_Cur = pCurrent->u + (y_pos << 4) * stride2 + (x_pos << 4);
		pV_Cur = pCurrent->v + (y_pos << 4) * stride2 + (x_pos << 4);

		/* Block size */
		cst = 16;

		/* Operation function */
		transfer_op = (transfer_operation_8to16_t*)filter_18x18_to_8x8;
	} else {

		/* Image pointers */
		pY_Cur = pCurrent->y + (y_pos << 4) * stride  + (x_pos << 4);
		pU_Cur = pCurrent->u + (y_pos << 3) * stride2 + (x_pos << 3);
		pV_Cur = pCurrent->v + (y_pos << 3) * stride2 + (x_pos << 3);

		/* Block size */
		cst = 8;

		/* Operation function */
		transfer_op = (transfer_operation_8to16_t*)transfer_8to16copy;
	}

	/* Do the transfer */
	start_timer();
	transfer_op(&data[0 * 64], pY_Cur, stride);
	transfer_op(&data[1 * 64], pY_Cur + cst, stride);
	transfer_op(&data[2 * 64], pY_Cur + next_block, stride);
	transfer_op(&data[3 * 64], pY_Cur + next_block + cst, stride);
	transfer_op(&data[4 * 64], pU_Cur, stride2);
	transfer_op(&data[5 * 64], pV_Cur, stride2);
	stop_transfer_timer();
}

static __inline void
MBTrans16to8(const MBParam * const pParam,
			 const FRAMEINFO * const frame,
			 const MACROBLOCK * const pMB,
			 const uint32_t x_pos,
			 const uint32_t y_pos,
			 int16_t data[6 * 64],
			 const uint32_t add,
			 const uint8_t cbp)
{
	uint8_t *pY_Cur, *pU_Cur, *pV_Cur;
	uint32_t stride = pParam->edged_width;
	uint32_t stride2 = stride / 2;
	uint32_t next_block = stride * 8;
	uint32_t cst;
	const IMAGE * const pCurrent = &frame->image;
	transfer_operation_16to8_t *transfer_op = NULL;

	if (pMB->field_dct) {
		next_block = stride;
		stride *= 2;
	}

	if ((frame->vop_flags & XVID_VOP_REDUCED)) {

		/* Image pointers */
		pY_Cur = pCurrent->y + (y_pos << 5) * stride  + (x_pos << 5);
		pU_Cur = pCurrent->u + (y_pos << 4) * stride2 + (x_pos << 4);
		pV_Cur = pCurrent->v + (y_pos << 4) * stride2 + (x_pos << 4);

		/* Block size */
		cst = 16;

		/* Operation function */
		if(add)
			transfer_op = (transfer_operation_16to8_t*)add_upsampled_8x8_16to8;
		else
			transfer_op = (transfer_operation_16to8_t*)copy_upsampled_8x8_16to8;
	} else {

		/* Image pointers */
		pY_Cur = pCurrent->y + (y_pos << 4) * stride  + (x_pos << 4);
		pU_Cur = pCurrent->u + (y_pos << 3) * stride2 + (x_pos << 3);
		pV_Cur = pCurrent->v + (y_pos << 3) * stride2 + (x_pos << 3);

		/* Block size */
		cst = 8;

		/* Operation function */
		if(add)
			transfer_op = (transfer_operation_16to8_t*)transfer_16to8add;
		else
			transfer_op = (transfer_operation_16to8_t*)transfer_16to8copy;
	}

	/* Do the operation */
	start_timer();
	if (cbp&32) transfer_op(pY_Cur, &data[0 * 64], stride);
	if (cbp&16) transfer_op(pY_Cur + cst, &data[1 * 64], stride);
	if (cbp& 8) transfer_op(pY_Cur + next_block, &data[2 * 64], stride);
	if (cbp& 4) transfer_op(pY_Cur + next_block + cst, &data[3 * 64], stride);
	if (cbp& 2) transfer_op(pU_Cur, &data[4 * 64], stride2);
	if (cbp& 1) transfer_op(pV_Cur, &data[5 * 64], stride2);
	stop_transfer_timer();
}

/*****************************************************************************
 * Module functions
 ****************************************************************************/

void
MBTransQuantIntra(const MBParam * const pParam,
				  const FRAMEINFO * const frame,
				  MACROBLOCK * const pMB,
				  const uint32_t x_pos,
				  const uint32_t y_pos,
				  int16_t data[6 * 64],
				  int16_t qcoeff[6 * 64])
{

	/* Transfer data */
	MBTrans8to16(pParam, frame, pMB, x_pos, y_pos, data);

	/* Perform DCT (and field decision) */
	MBfDCT(pParam, frame, pMB, x_pos, y_pos, data);

	/* Quantize the block */
	MBQuantIntra(pParam, frame, pMB, data, qcoeff);

	/* DeQuantize the block */
	MBDeQuantIntra(pParam, pMB->quant, data, qcoeff);

	/* Perform inverse DCT*/
	MBiDCT(data, 0x3F);

 	/* Transfer back the data -- Don't add data */
	MBTrans16to8(pParam, frame, pMB, x_pos, y_pos, data, 0, 0x3F);
}


uint8_t
MBTransQuantInter(const MBParam * const pParam,
				  const FRAMEINFO * const frame,
				  MACROBLOCK * const pMB,
				  const uint32_t x_pos,
				  const uint32_t y_pos,
				  int16_t data[6 * 64],
				  int16_t qcoeff[6 * 64])
{
	uint8_t cbp;
	uint32_t limit;

	/*
	 * There is no MBTrans8to16 for Inter block, that's done in motion compensation
	 * already
	 */

	/* Perform DCT (and field decision) */
	MBfDCT(pParam, frame, pMB, x_pos, y_pos, data);

	/* Set the limit threshold */
	limit = PVOP_TOOSMALL_LIMIT + ((pMB->quant == 1)? 1 : 0);

	if (frame->vop_flags & XVID_VOP_CARTOON)
		limit *= 3;

	/* Quantize the block */
	cbp = MBQuantInter(pParam, frame, pMB, data, qcoeff, 0, limit);

	/* DeQuantize the block */
	MBDeQuantInter(pParam, pMB->quant, data, qcoeff, cbp);

	/* Perform inverse DCT*/
	MBiDCT(data, cbp);

 	/* Transfer back the data -- Add the data */
	MBTrans16to8(pParam, frame, pMB, x_pos, y_pos, data, 1, cbp);

	return(cbp);
}

uint8_t
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])
{
	uint8_t cbp;
	uint32_t limit;

	/*
	 * There is no MBTrans8to16 for Inter block, that's done in motion compensation
	 * already
	 */

	/* Perform DCT (and field decision) */
	MBfDCT(pParam, frame, pMB, x_pos, y_pos, data);

	/* Set the limit threshold */
	limit = BVOP_TOOSMALL_LIMIT;

	if (frame->vop_flags & XVID_VOP_CARTOON)
		limit *= 2;

	/* Quantize the block */
	cbp = MBQuantInter(pParam, frame, pMB, data, qcoeff, 1, limit);

	/*
	 * History comment:
	 * We don't have to DeQuant, iDCT and Transfer back data for B-frames.
	 *
	 * BUT some plugins require the original frame to be passed so we have
	 * to take care of that here
	 */
	if((pParam->plugin_flags & XVID_REQORIGINAL)) {

		/* DeQuantize the block */
		MBDeQuantInter(pParam, pMB->quant, data, qcoeff, cbp);

		/* Perform inverse DCT*/
		MBiDCT(data, cbp);

		/* Transfer back the data -- Add the data */
		MBTrans16to8(pParam, frame, pMB, x_pos, y_pos, data, 1, cbp);
	}

	return(cbp);
}

/* if sum(diff between field lines) < sum(diff between frame lines), use field dct */
uint32_t
MBFieldTest_c(int16_t data[6 * 64])
{
	const uint8_t blocks[] =
		{ 0 * 64, 0 * 64, 0 * 64, 0 * 64, 2 * 64, 2 * 64, 2 * 64, 2 * 64 };
	const uint8_t lines[] = { 0, 16, 32, 48, 0, 16, 32, 48 };

	int frame = 0, field = 0;
	int i, j;

	for (i = 0; i < 7; ++i) {
		for (j = 0; j < 8; ++j) {
			frame +=
				abs(data[0 * 64 + (i + 1) * 8 + j] - data[0 * 64 + i * 8 + j]);
			frame +=
				abs(data[1 * 64 + (i + 1) * 8 + j] - data[1 * 64 + i * 8 + j]);
			frame +=
				abs(data[2 * 64 + (i + 1) * 8 + j] - data[2 * 64 + i * 8 + j]);
			frame +=
				abs(data[3 * 64 + (i + 1) * 8 + j] - data[3 * 64 + i * 8 + j]);

			field +=
				abs(data[blocks[i + 1] + lines[i + 1] + j] -
					data[blocks[i] + lines[i] + j]);
			field +=
				abs(data[blocks[i + 1] + lines[i + 1] + 8 + j] -
					data[blocks[i] + lines[i] + 8 + j]);
			field +=
				abs(data[blocks[i + 1] + 64 + lines[i + 1] + j] -
					data[blocks[i] + 64 + lines[i] + j]);
			field +=
				abs(data[blocks[i + 1] + 64 + lines[i + 1] + 8 + j] -
					data[blocks[i] + 64 + lines[i] + 8 + j]);
		}
	}

	return (frame >= (field + 350));
}


/* deinterlace Y blocks vertically */

#define MOVLINE(X,Y) memcpy(X, Y, sizeof(tmp))
#define LINE(X,Y)	&data[X*64 + Y*8]

void
MBFrameToField(int16_t data[6 * 64])
{
	int16_t tmp[8];

	/* left blocks */

	/* 1=2, 2=4, 4=8, 8=1 */
	MOVLINE(tmp, LINE(0, 1));
	MOVLINE(LINE(0, 1), LINE(0, 2));
	MOVLINE(LINE(0, 2), LINE(0, 4));
	MOVLINE(LINE(0, 4), LINE(2, 0));
	MOVLINE(LINE(2, 0), tmp);

	/* 3=6, 6=12, 12=9, 9=3 */
	MOVLINE(tmp, LINE(0, 3));
	MOVLINE(LINE(0, 3), LINE(0, 6));
	MOVLINE(LINE(0, 6), LINE(2, 4));
	MOVLINE(LINE(2, 4), LINE(2, 1));
	MOVLINE(LINE(2, 1), tmp);

	/* 5=10, 10=5 */
	MOVLINE(tmp, LINE(0, 5));
	MOVLINE(LINE(0, 5), LINE(2, 2));
	MOVLINE(LINE(2, 2), tmp);

	/* 7=14, 14=13, 13=11, 11=7 */
	MOVLINE(tmp, LINE(0, 7));
	MOVLINE(LINE(0, 7), LINE(2, 6));
	MOVLINE(LINE(2, 6), LINE(2, 5));
	MOVLINE(LINE(2, 5), LINE(2, 3));
	MOVLINE(LINE(2, 3), tmp);

	/* right blocks */

	/* 1=2, 2=4, 4=8, 8=1 */
	MOVLINE(tmp, LINE(1, 1));
	MOVLINE(LINE(1, 1), LINE(1, 2));
	MOVLINE(LINE(1, 2), LINE(1, 4));
	MOVLINE(LINE(1, 4), LINE(3, 0));
	MOVLINE(LINE(3, 0), tmp);

	/* 3=6, 6=12, 12=9, 9=3 */
	MOVLINE(tmp, LINE(1, 3));
	MOVLINE(LINE(1, 3), LINE(1, 6));
	MOVLINE(LINE(1, 6), LINE(3, 4));
	MOVLINE(LINE(3, 4), LINE(3, 1));
	MOVLINE(LINE(3, 1), tmp);

	/* 5=10, 10=5 */
	MOVLINE(tmp, LINE(1, 5));
	MOVLINE(LINE(1, 5), LINE(3, 2));
	MOVLINE(LINE(3, 2), tmp);

	/* 7=14, 14=13, 13=11, 11=7 */
	MOVLINE(tmp, LINE(1, 7));
	MOVLINE(LINE(1, 7), LINE(3, 6));
	MOVLINE(LINE(3, 6), LINE(3, 5));
	MOVLINE(LINE(3, 5), LINE(3, 3));
	MOVLINE(LINE(3, 3), tmp);
}





/*****************************************************************************
 *               Trellis based R-D optimal quantization
 *
 *   Trellis Quant code (C) 2003 Pascal Massimino skal(at)planet-d.net
 *
 ****************************************************************************/


#if 0
static int 
dct_quantize_trellis_mpeg_c(int16_t *const Out,
							const int16_t *const In,
							int Q, 
							const uint16_t * const Zigzag,
							int Non_Zero)
{
	return 63;
}
#endif

/*----------------------------------------------------------------------------
 *
 *        Trellis-Based quantization
 *
 * So far I understand this paper:
 *
 *  "Trellis-Based R-D Optimal Quantization in H.263+"
 *    J.Wen, M.Luttrell, J.Villasenor
 *    IEEE Transactions on Image Processing, Vol.9, No.8, Aug. 2000.
 *
 * we are at stake with a simplified Bellmand-Ford / Dijkstra Single
 * Source Shorted Path algo. But due to the underlying graph structure
 * ("Trellis"), it can be turned into a dynamic programming algo,
 * partially saving the explicit graph's nodes representation. And 
 * without using a heap, since the open frontier of the DAG is always
 * known, and of fixed sized.
 *--------------------------------------------------------------------------*/



/* Codes lengths for relevant levels. */

  /* let's factorize: */
static const uint8_t Code_Len0[64] = {
  30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,
  30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30 };
static const uint8_t Code_Len1[64] = {
  20,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,
  30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30 };
static const uint8_t Code_Len2[64] = {
  19,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,
  30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30 };
static const uint8_t Code_Len3[64] = {
  18,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,
  30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30 };
static const uint8_t Code_Len4[64] = {
  17,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,
  30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30 };
static const uint8_t Code_Len5[64] = {
  16,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,
  30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30 };
static const uint8_t Code_Len6[64] = {
  15,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,
  30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30 };
static const uint8_t Code_Len7[64] = {
  13,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,
  30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30 };
static const uint8_t Code_Len8[64] = {
  11,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,
  30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30 };
static const uint8_t Code_Len9[64] = {
  12,21,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,
  30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30 };
static const uint8_t Code_Len10[64] = {
  12,20,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,
  30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30 };
static const uint8_t Code_Len11[64] = {
  12,19,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,
  30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30 };
static const uint8_t Code_Len12[64] = {
  11,17,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,
  30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30 };
static const uint8_t Code_Len13[64] = {
  11,15,21,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,
  30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30 };
static const uint8_t Code_Len14[64] = {
  10,12,19,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,
  30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30 };
static const uint8_t Code_Len15[64] = {
  10,13,17,19,21,21,21,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,
  30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30 };
static const uint8_t Code_Len16[64] = {
   9,12,13,18,18,19,19,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,
  30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30};
static const uint8_t Code_Len17[64] = {
   8,11,13,14,14,14,15,19,19,19,21,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,
  30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30 };
static const uint8_t Code_Len18[64] = {
   7, 9,11,11,13,13,13,15,15,15,16,22,22,22,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,
  30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30 };
static const uint8_t Code_Len19[64] = {
   5, 7, 9,10,10,11,11,11,11,11,13,14,16,17,17,18,18,18,18,18,18,18,18,20,20,21,21,30,30,30,30,30,
  30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30 };
static const uint8_t Code_Len20[64] = {
   3, 4, 5, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 9, 9,10,10,10,10,10,10,10,10,12,12,13,13,12,13,14,15,15,
  15,16,16,16,16,17,17,17,18,18,19,19,19,19,19,19,19,19,21,21,22,22,30,30,30,30,30,30,30,30,30,30 };

  /* a few more table for LAST table: */
static const uint8_t Code_Len21[64] = {
  13,20,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,
  30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30};
static const uint8_t Code_Len22[64] = {
  12,15,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,
  30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30};
static const uint8_t Code_Len23[64] = {
  10,12,15,15,15,16,16,16,16,17,17,17,17,17,17,17,17,18,18,18,18,18,18,18,18,19,19,19,19,20,20,20,
  20,21,21,21,21,21,21,21,21,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30};
static const uint8_t Code_Len24[64] = {
   5, 7, 7, 7, 7, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9,10,10,10,10,10,10,10,10,11,11,11,11,12,12,12,
  12,13,13,13,13,13,13,13,13,14,16,16,16,16,17,17,17,17,18,18,18,18,18,18,18,18,19,19,19,19,19,19};


static const uint8_t * const B16_17_Code_Len[24] = { /* levels [1..24] */
  Code_Len20,Code_Len19,Code_Len18,Code_Len17,
  Code_Len16,Code_Len15,Code_Len14,Code_Len13,
  Code_Len12,Code_Len11,Code_Len10,Code_Len9,
  Code_Len8, Code_Len7 ,Code_Len6 ,Code_Len5,
  Code_Len4, Code_Len3, Code_Len3 ,Code_Len2,
  Code_Len2, Code_Len1, Code_Len1, Code_Len1,
};

static const uint8_t * const B16_17_Code_Len_Last[6] = { /* levels [1..6] */
  Code_Len24,Code_Len23,Code_Len22,Code_Len21, Code_Len3, Code_Len1, 
};

#define TL(q) 0xfe00/(q*q)

static const int Trellis_Lambda_Tabs[31] = {
         TL( 1),TL( 2),TL( 3),TL( 4),TL( 5),TL( 6), TL( 7),
  TL( 8),TL( 9),TL(10),TL(11),TL(12),TL(13),TL(14), TL(15),
  TL(16),TL(17),TL(18),TL(19),TL(20),TL(21),TL(22), TL(23),
  TL(24),TL(25),TL(26),TL(27),TL(28),TL(29),TL(30), TL(31)
};
#undef TL

static __inline int Find_Last(const int16_t *C, const uint16_t *Zigzag, int i)
{
  while(i>=0)
    if (C[Zigzag[i]])
      return i;
    else i--;
  return -1;
}

/* this routine has been strippen of all debug code */

static int 
dct_quantize_trellis_h263_c(int16_t *const Out, const int16_t *const In, int Q, const uint16_t * const Zigzag, int Non_Zero)
{

    /*
	 * Note: We should search last non-zero coeffs on *real* DCT input coeffs (In[]),
	 * not quantized one (Out[]). However, it only improves the result *very*
	 * slightly (~0.01dB), whereas speed drops to crawling level :)
	 * Well, actually, taking 1 more coeff past Non_Zero into account sometimes helps.
	 */
  typedef struct { int16_t Run, Level; } NODE;
  
  NODE Nodes[65], Last;
  uint32_t Run_Costs0[64+1];
  uint32_t * const Run_Costs = Run_Costs0 + 1;
  const int Mult = 2*Q;
  const int Bias = (Q-1) | 1;
  const int Lev0 = Mult + Bias;
  const int Lambda = Trellis_Lambda_Tabs[Q-1];    /* it's 1/lambda, actually */

  int Run_Start = -1;
  uint32_t Min_Cost = 2<<16;

  int Last_Node = -1;
  uint32_t Last_Cost = 0;

  int i, j;
  Run_Costs[-1] = 2<<16;                          /* source (w/ CBP penalty) */

  Non_Zero = Find_Last(Out, Zigzag, Non_Zero);
  if (Non_Zero<0)
      return -1;  

  for(i=0; i<=Non_Zero; i++)
  {
    const int AC = In[Zigzag[i]];
    const int Level1 = Out[Zigzag[i]];
    const int Dist0 = Lambda* AC*AC;
    uint32_t Best_Cost = 0xf0000000;
    Last_Cost += Dist0;

    if ((uint32_t)(Level1+1)<3)                 /* very specialized loop for -1,0,+1 */
    {
    	int dQ;
	  	int Run;
      uint32_t Cost0;

      if (AC<0) {
        Nodes[i].Level = -1;
        dQ = Lev0 + AC;
      } else {
        Nodes[i].Level = 1;
        dQ = Lev0 - AC;
      }
		Cost0 = Lambda*dQ*dQ;
		
      Nodes[i].Run = 1;
      Best_Cost = (Code_Len20[0]<<16) + Run_Costs[i-1]+Cost0;
      for(Run=i-Run_Start; Run>0; --Run)
      {
        const uint32_t Cost_Base = Cost0 + Run_Costs[i-Run];
        const uint32_t Cost = Cost_Base + (Code_Len20[Run-1]<<16);
        const uint32_t lCost = Cost_Base + (Code_Len24[Run-1]<<16);

          /*
		   * TODO: what about tie-breaks? Should we favor short runs or
		   * long runs? Although the error is the same, it would not be
		   * spread the same way along high and low frequencies...
		   */

			/* (I'd say: favour short runs => hifreq errors (HVS) -- gruel ) */

        if (Cost<Best_Cost) {
          Best_Cost    = Cost;
          Nodes[i].Run = Run;
        }

        if (lCost<Last_Cost) {
          Last_Cost  = lCost;
          Last.Run   = Run;
          Last_Node  = i;
        }
      }
      if (Last_Node==i) 
			Last.Level = Nodes[i].Level;
    }
    else                      /* "big" levels */
    {
      const uint8_t *Tbl_L1, *Tbl_L2, *Tbl_L1_Last, *Tbl_L2_Last;
      int Level2;
      int dQ1, dQ2;
      int Run;
		uint32_t Dist1,Dist2;
		int dDist21;
		
	  if (Level1>1) {
        dQ1 = Level1*Mult-AC + Bias;
        dQ2 = dQ1 - Mult;
        Level2 = Level1-1;
        Tbl_L1      = (Level1<=24) ? B16_17_Code_Len[Level1-1]     : Code_Len0;
        Tbl_L2      = (Level2<=24) ? B16_17_Code_Len[Level2-1]     : Code_Len0;
        Tbl_L1_Last = (Level1<=6) ? B16_17_Code_Len_Last[Level1-1] : Code_Len0;
        Tbl_L2_Last = (Level2<=6) ? B16_17_Code_Len_Last[Level2-1] : Code_Len0;
      } else { /* Level1<-1 */
        dQ1 = Level1*Mult-AC - Bias;
        dQ2 = dQ1 + Mult;
        Level2 = Level1 + 1;
        Tbl_L1      = (Level1>=-24) ? B16_17_Code_Len[Level1^-1]      : Code_Len0;
        Tbl_L2      = (Level2>=-24) ? B16_17_Code_Len[Level2^-1]      : Code_Len0;
        Tbl_L1_Last = (Level1>=- 6) ? B16_17_Code_Len_Last[Level1^-1] : Code_Len0;
        Tbl_L2_Last = (Level2>=- 6) ? B16_17_Code_Len_Last[Level2^-1] : Code_Len0;
      }
      Dist1 = Lambda*dQ1*dQ1;
      Dist2 = Lambda*dQ2*dQ2;
      dDist21 = Dist2-Dist1;

      for(Run=i-Run_Start; Run>0; --Run)
      {
        const uint32_t Cost_Base = Dist1 + Run_Costs[i-Run];
        uint32_t Cost1, Cost2;
        int bLevel;

/*
 * for sub-optimal (but slightly worth it, speed-wise) search, uncomment the following:
 *      if (Cost_Base>=Best_Cost) continue;
 * (? doesn't seem to have any effect -- gruel )
 */

        Cost1 = Cost_Base + (Tbl_L1[Run-1]<<16);
        Cost2 = Cost_Base + (Tbl_L2[Run-1]<<16) + dDist21;

        if (Cost2<Cost1) { 
			 Cost1 = Cost2; 
			 bLevel = Level2; 
		  } else 
		  	 bLevel = Level1;

        if (Cost1<Best_Cost) {
          Best_Cost = Cost1;
          Nodes[i].Run   = Run;
          Nodes[i].Level = bLevel;
        }

        Cost1 = Cost_Base + (Tbl_L1_Last[Run-1]<<16);
        Cost2 = Cost_Base + (Tbl_L2_Last[Run-1]<<16) + dDist21;

        if (Cost2<Cost1) { 
		  	 Cost1 = Cost2; 
			 bLevel = Level2; 
		  } else 
		  	 bLevel = Level1;
			 
        if (Cost1<Last_Cost) {
          Last_Cost  = Cost1;
          Last.Run   = Run;
          Last.Level = bLevel;
          Last_Node  = i;
        }
      } /* end of "for Run" */

    }

    Run_Costs[i] = Best_Cost;

    if (Best_Cost < Min_Cost + Dist0) {
      Min_Cost = Best_Cost;
      Run_Start = i;
    }
    else
    {
        /*
		 * as noticed by Michael Niedermayer (michaelni at gmx.at), there's
		 * a code shorter by 1 bit for a larger run (!), same level. We give
		 * it a chance by not moving the left barrier too much.
		 */

      while( Run_Costs[Run_Start]>Min_Cost+(1<<16) )
        Run_Start++;

        /* spread on preceding coeffs the cost incurred by skipping this one */
      for(j=Run_Start; j<i; ++j) Run_Costs[j] += Dist0;
      Min_Cost += Dist0;
    }
  }

  if (Last_Node<0)
    return -1;

       /* reconstruct optimal sequence backward with surviving paths */
  memset(Out, 0x00, 64*sizeof(*Out));
  Out[Zigzag[Last_Node]] = Last.Level;
  i = Last_Node - Last.Run;
  while(i>=0) {
    Out[Zigzag[i]] = Nodes[i].Level;
    i -= Nodes[i].Run;
  }
  return Last_Node;
}











/* original version including heavy debugging info */

#ifdef DBGTRELL

#define DBG 0

static __inline uint32_t Evaluate_Cost(const int16_t *C, int Mult, int Bias,
                                const uint16_t * Zigzag, int Max, int Lambda)
{
#if (DBG>0)
  const int16_t * const Ref = C + 6*64;
  int Last = Max;
  int Bits = 0;
  int Dist = 0;
  int i; 
  uint32_t Cost;
  
  while(Last>=0 && C[Zigzag[Last]]==0) 
  	Last--;
	
  if (Last>=0) {
    int j=0, j0=0;
    int Run, Level;

    Bits = 2;   /* CBP */
    while(j<Last) {
      while(!C[Zigzag[j]]) 
			j++;
      if (j==Last) 
			break;
      Level=C[Zigzag[j]];
      Run = j - j0;
      j0 = ++j;
      if (Level>=-24 && Level<=24) 
			Bits += B16_17_Code_Len[(Level<0) ? -Level-1 : Level-1][Run];
      else 
			Bits += 30;
    }
    Level = C[Zigzag[Last]];
    Run = j - j0;
    if (Level>=-6 && Level<=6) 
	 	Bits += B16_17_Code_Len_Last[(Level<0) ? -Level-1 : Level-1][Run];
    else 
	 	Bits += 30;
  }

  for(i=0; i<=Last; ++i) {
    int V = C[Zigzag[i]]*Mult;
    if (V>0) 
	 	V += Bias;
    else 
	 	if (V<0) 
			V -= Bias;
    V -= Ref[Zigzag[i]];
    Dist += V*V;
  }
  Cost = Lambda*Dist + (Bits<<16);
  if (DBG==1)
    printf( " Last:%2d/%2d Cost = [(Bits=%5.0d) + Lambda*(Dist=%6.0d) = %d ] >>12= %d ", Last,Max, Bits, Dist, Cost, Cost>>12 );
  return Cost;

#else
  return 0;
#endif
}


static int 
dct_quantize_trellis_h263_c(int16_t *const Out, const int16_t *const In, int Q, const uint16_t * const Zigzag, int Non_Zero)
{

    /*
	 * Note: We should search last non-zero coeffs on *real* DCT input coeffs (In[]),
	 * not quantized one (Out[]). However, it only improves the result *very*
	 * slightly (~0.01dB), whereas speed drops to crawling level :)
	 * Well, actually, taking 1 more coeff past Non_Zero into account sometimes helps.
	 */
  typedef struct { int16_t Run, Level; } NODE;
  
  NODE Nodes[65], Last;
  uint32_t Run_Costs0[64+1];
  uint32_t * const Run_Costs = Run_Costs0 + 1;
  const int Mult = 2*Q;
  const int Bias = (Q-1) | 1;
  const int Lev0 = Mult + Bias;
  const int Lambda = Trellis_Lambda_Tabs[Q-1];    /* it's 1/lambda, actually */

  int Run_Start = -1;
  Run_Costs[-1] = 2<<16;                          /* source (w/ CBP penalty) */
  uint32_t Min_Cost = 2<<16;

  int Last_Node = -1;
  uint32_t Last_Cost = 0;

  int i, j;

#if (DBG>0)
  Last.Level = 0; Last.Run = -1; /* just initialize to smthg */
#endif

  Non_Zero = Find_Last(Out, Zigzag, Non_Zero);
  if (Non_Zero<0)
      return -1;  

  for(i=0; i<=Non_Zero; i++)
  {
    const int AC = In[Zigzag[i]];
    const int Level1 = Out[Zigzag[i]];
    const int Dist0 = Lambda* AC*AC;
    uint32_t Best_Cost = 0xf0000000;
    Last_Cost += Dist0;

    if ((uint32_t)(Level1+1)<3)                 /* very specialized loop for -1,0,+1 */
    {
    	int dQ;
	  	int Run;
      uint32_t Cost0;

      if (AC<0) {
        Nodes[i].Level = -1;
        dQ = Lev0 + AC;
      } else {
        Nodes[i].Level = 1;
        dQ = Lev0 - AC;
      }
		Cost0 = Lambda*dQ*dQ;
		
      Nodes[i].Run = 1;
      Best_Cost = (Code_Len20[0]<<16) + Run_Costs[i-1]+Cost0;
      for(Run=i-Run_Start; Run>0; --Run)
      {
        const uint32_t Cost_Base = Cost0 + Run_Costs[i-Run];
        const uint32_t Cost = Cost_Base + (Code_Len20[Run-1]<<16);
        const uint32_t lCost = Cost_Base + (Code_Len24[Run-1]<<16);

          /*
		   * TODO: what about tie-breaks? Should we favor short runs or
		   * long runs? Although the error is the same, it would not be
		   * spread the same way along high and low frequencies...
		   */
        if (Cost<Best_Cost) {
          Best_Cost    = Cost;
          Nodes[i].Run = Run;
        }

        if (lCost<Last_Cost) {
          Last_Cost  = lCost;
          Last.Run   = Run;
          Last_Node  = i;
        }
      }
      if (Last_Node==i) 
			Last.Level = Nodes[i].Level;

      if (DBG==1) {
        Run_Costs[i] = Best_Cost;
        printf( "Costs #%2d: ", i);
        for(j=-1;j<=Non_Zero;++j) {
          if (j==Run_Start)            printf( " %3.0d|", Run_Costs[j]>>12 );
          else if (j>Run_Start && j<i) printf( " %3.0d|", Run_Costs[j]>>12 );
          else if (j==i)               printf( "(%3.0d)", Run_Costs[j]>>12 );
          else                         printf( "  - |" );
        }
        printf( "<%3.0d %2d %d>", Min_Cost>>12, Nodes[i].Level, Nodes[i].Run );
        printf( "  Last:#%2d {%3.0d %2d %d}", Last_Node, Last_Cost>>12, Last.Level, Last.Run );
        printf( " AC:%3.0d Dist0:%3d Dist(%d)=%d", AC, Dist0>>12, Nodes[i].Level, Cost0>>12 );
        printf( "\n" );
      }
    }
    else                      /* "big" levels */
    {
      const uint8_t *Tbl_L1, *Tbl_L2, *Tbl_L1_Last, *Tbl_L2_Last;
      int Level2;
      int dQ1, dQ2;
      int Run;
		uint32_t Dist1,Dist2;
		int dDist21;
		
	  if (Level1>1) {
        dQ1 = Level1*Mult-AC + Bias;
        dQ2 = dQ1 - Mult;
        Level2 = Level1-1;
        Tbl_L1      = (Level1<=24) ? B16_17_Code_Len[Level1-1]     : Code_Len0;
        Tbl_L2      = (Level2<=24) ? B16_17_Code_Len[Level2-1]     : Code_Len0;
        Tbl_L1_Last = (Level1<=6) ? B16_17_Code_Len_Last[Level1-1] : Code_Len0;
        Tbl_L2_Last = (Level2<=6) ? B16_17_Code_Len_Last[Level2-1] : Code_Len0;
      } else { /* Level1<-1 */
        dQ1 = Level1*Mult-AC - Bias;
        dQ2 = dQ1 + Mult;
        Level2 = Level1 + 1;
        Tbl_L1      = (Level1>=-24) ? B16_17_Code_Len[Level1^-1]      : Code_Len0;
        Tbl_L2      = (Level2>=-24) ? B16_17_Code_Len[Level2^-1]      : Code_Len0;
        Tbl_L1_Last = (Level1>=- 6) ? B16_17_Code_Len_Last[Level1^-1] : Code_Len0;
        Tbl_L2_Last = (Level2>=- 6) ? B16_17_Code_Len_Last[Level2^-1] : Code_Len0;
      }
      Dist1 = Lambda*dQ1*dQ1;
      Dist2 = Lambda*dQ2*dQ2;
      dDist21 = Dist2-Dist1;

      for(Run=i-Run_Start; Run>0; --Run)
      {
        const uint32_t Cost_Base = Dist1 + Run_Costs[i-Run];
        uint32_t Cost1, Cost2;
        int bLevel;

/*
 * for sub-optimal (but slightly worth it, speed-wise) search, uncomment the following:
 *        if (Cost_Base>=Best_Cost) continue;
 */
        Cost1 = Cost_Base + (Tbl_L1[Run-1]<<16);
        Cost2 = Cost_Base + (Tbl_L2[Run-1]<<16) + dDist21;

        if (Cost2<Cost1) { 
			 Cost1 = Cost2; 
			 bLevel = Level2; 
		  } else 
		  	 bLevel = Level1;

        if (Cost1<Best_Cost) {
          Best_Cost = Cost1;
          Nodes[i].Run   = Run;
          Nodes[i].Level = bLevel;
        }

        Cost1 = Cost_Base + (Tbl_L1_Last[Run-1]<<16);
        Cost2 = Cost_Base + (Tbl_L2_Last[Run-1]<<16) + dDist21;

        if (Cost2<Cost1) { 
		  	 Cost1 = Cost2; 
			 bLevel = Level2; 
		  } else 
		  	 bLevel = Level1;
			 
        if (Cost1<Last_Cost) {
          Last_Cost  = Cost1;
          Last.Run   = Run;
          Last.Level = bLevel;
          Last_Node  = i;
        }
      } /* end of "for Run" */

      if (DBG==1) {
        Run_Costs[i] = Best_Cost;
        printf( "Costs #%2d: ", i);
        for(j=-1;j<=Non_Zero;++j) {
          if (j==Run_Start)            printf( " %3.0d|", Run_Costs[j]>>12 );
          else if (j>Run_Start && j<i) printf( " %3.0d|", Run_Costs[j]>>12 );
          else if (j==i)               printf( "(%3.0d)", Run_Costs[j]>>12 );
          else                         printf( "  - |" );
        }
        printf( "<%3.0d %2d %d>", Min_Cost>>12, Nodes[i].Level, Nodes[i].Run );
        printf( "  Last:#%2d {%3.0d %2d %d}", Last_Node, Last_Cost>>12, Last.Level, Last.Run );
        printf( " AC:%3.0d Dist0:%3d Dist(%2d):%3d Dist(%2d):%3d", AC, Dist0>>12, Level1, Dist1>>12, Level2, Dist2>>12 );
        printf( "\n" );
      }
    }

    Run_Costs[i] = Best_Cost;

    if (Best_Cost < Min_Cost + Dist0) {
      Min_Cost = Best_Cost;
      Run_Start = i;
    }
    else
    {
        /*
		 * as noticed by Michael Niedermayer (michaelni at gmx.at), there's
		 * a code shorter by 1 bit for a larger run (!), same level. We give
		 * it a chance by not moving the left barrier too much.
		 */

      while( Run_Costs[Run_Start]>Min_Cost+(1<<16) )
        Run_Start++;

        /* spread on preceding coeffs the cost incurred by skipping this one */
      for(j=Run_Start; j<i; ++j) Run_Costs[j] += Dist0;
      Min_Cost += Dist0;
    }
  }

  if (DBG) {
    Last_Cost = Evaluate_Cost(Out,Mult,Bias, Zigzag,Non_Zero, Lambda);
    if (DBG==1) {
      printf( "=> " );
      for(i=0; i<=Non_Zero; ++i) printf( "[%3.0d] ", Out[Zigzag[i]] );
      printf( "\n" );
   }
  }

  if (Last_Node<0)
    return -1;

       /* reconstruct optimal sequence backward with surviving paths */
  memset(Out, 0x00, 64*sizeof(*Out));
  Out[Zigzag[Last_Node]] = Last.Level;
  i = Last_Node - Last.Run;
  while(i>=0) {
    Out[Zigzag[i]] = Nodes[i].Level;
    i -= Nodes[i].Run;
  }

  if (DBG) {
    uint32_t Cost = Evaluate_Cost(Out,Mult,Bias, Zigzag,Non_Zero, Lambda);
    if (DBG==1) {
      printf( "<= " ); 
      for(i=0; i<=Last_Node; ++i) printf( "[%3.0d] ", Out[Zigzag[i]] );
      printf( "\n--------------------------------\n" );
    }
    if (Cost>Last_Cost) printf( "!!! %u > %u\n", Cost, Last_Cost );
  }
  return Last_Node;
}

#undef DBG

#endif

No admin address has been configured
ViewVC Help
Powered by ViewVC 1.0.4