text_code.c

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/**************************************************************************
 *                                                                        *
 * This code is developed by Adam Li.  This software is an                *
 * implementation of a part of one or more MPEG-4 Video tools as          *
 * specified in ISO/IEC 14496-2 standard.  Those intending to use this    *
 * software module in hardware or software products are advised that its  *
 * use may infringe existing patents or copyrights, and any such use      *
 * would be at such party's own risk.  The original developer of this     *
 * software module and his/her company, and subsequent editors and their  *
 * companies (including Project Mayo), will have no liability for use of  *
 * this software or modifications or derivatives thereof.                 *
 *                                                                        *
 * Project Mayo gives users of the Codec a license to this software       *
 * module or modifications thereof for use in hardware or software        *
 * products claiming conformance to the MPEG-4 Video Standard as          *
 * described in the Open DivX license.                                    *
 *                                                                        *
 * The complete Open DivX license can be found at                         *
 * http://www.projectmayo.com/opendivx/license.php .                      *
 *                                                                        *
 **************************************************************************/

/**************************************************************************
 *
 *  text_code.c
 *
 *  Copyright (C) 2001  Project Mayo
 *
 *  Adam Li
 *
 *  DivX Advance Research Center <[e-mail]>
 *
 **************************************************************************/

/* This file contains some functions for text coding of image.            */
/* Some codes of this project come from MoMuSys MPEG-4 implementation.    */
/* Please see seperate acknowledgement file for a list of contributors.   */

#include "text_defs.h"
#include "mot_code.h"
#include "bitstream.h"
#include "putvlc.h"
#include "mot_util.h"
#include "text_code_mb.h"
#include "text_code.h"

#define SKIPP       6

extern FILE *ftrace;

Void  	Bits_CountMB_combined (	Int DQUANT,
			Int Mode,
			Int COD,
			Int ACpred_flag,
			Int CBP,
			Int vop_type,
			Bits *bits,
			Image *mottext_bitstream,
			Int *MB_transp_pattern
	);
Int  	doDCACpred (	Int *qcoeff,
			Int *CBP,
			Int ncoeffs,
			Int x_pos,
			Int y_pos,
			Int ***DC_store,
			Int QP,
			Int MB_width,
			Int direction[],
			Int mid_grey
	);
Void nullfill(Int pred[], Int mid_grey);
Int Idir_c(Int val, Int QP);
Int  	IntraDCSwitch_Decision _P_((	Int Mode,
			Int intra_dc_vlc_thr,
			Int Qp
	));
Int  	FindCBP _P_((	Int *qcoeff,
			Int Mode,
			Int ncoeffs
	));


/***********************************************************CommentBegin******
 *
 * -- VopCodeShapeTextIntraCom --Intra texture encoding of one vop,
 *                          Combined shape/(motion)/texture mode
 *
 * Purpose :
 *	Intra texture encoding of one vop (combined shape/(mot)/text mode)
 *
 * Arguments in :
 *	    Vop curr : the current vop to be coded
 *      Int intra_dcpred_disable : disable intradc prediction
 *      Image* AB_SizeConversionDecisions:
 *      Image* AB_first_MMR_values
 *      VolConfig *vol_config : configuration information
 *      Int rc_type : rate control type:
 *
 * Arguments out :
 *	    Vop *rec_curr : the reconstructed current vop
 * 	    Image *texture_bitstream : the output bitstream
 *      Bits : statistics information
 *
 * Description :
 *	This function performs Intra texture encoding of one vop.
 *
 ***********************************************************CommentEnd********/

Void VopCodeShapeTextIntraCom(Vop *curr,
Vop *rec_curr, Image *mottext_bitstream)
{
	Int QP = GetVopIntraQuantizer(curr);
	Int Mode = MODE_INTRA;
	Int* qcoeff;
	Int i, j;
	Int CBP, COD;
	Int CBPY, CBPC;
	Int num_pixels = GetImageSizeX(GetVopY(curr));
	Int num_lines = GetImageSizeY(GetVopY(curr));
	Int vop_type;
	Int ***DC_store;
	Int MB_width = num_pixels / MB_SIZE;
	Int MB_height = num_lines / MB_SIZE;
	Int m;
	Int ACpred_flag=-1;
	Int direction[6];
	Int switched=0;
	Int DQUANT =0;

	Bits nbits, *bits;
	bits = &nbits;

	qcoeff = (Int *) malloc (sizeof (Int) * 384);

	#ifdef _RC_DEBUG_
	fprintf(ftrace, "RC - VopCodeShapeTextIntraCom(): ---> CODING WITH: %d \n",QP);
	#endif

	for (i = 0; i < 6; i++)
		direction[i] = 0;

	/* allocate space for 3D matrix to keep track of prediction values
	   for DC/AC prediction */

	DC_store = (Int ***)calloc(MB_width*MB_height, sizeof(Int **));
	for (i = 0; i < MB_width*MB_height; i++)
	{
		DC_store[i] = (Int **)calloc(6, sizeof(Int *));
		for (j = 0; j < 6; j++)
			DC_store[i][j] = (Int *)calloc(15, sizeof(Int));
	}

	Bits_Reset (bits);
	vop_type = PCT_INTRA;

	for (j = 0; j < num_lines/MB_SIZE; j++)		  /* Macro Block loop */
	{
		for (i = 0; i < num_pixels/MB_SIZE; i++)
		{
			DQUANT = 0;

			COD = 0;
			bits->no_intra++;

			CodeMB (curr, rec_curr, NULL, i*MB_SIZE, j*MB_SIZE,
				num_pixels, QP+DQUANT, MODE_INTRA, qcoeff);

			m =0;

			DC_store[j*MB_width+i][0][m] = qcoeff[m]*cal_dc_scaler(QP+DQUANT,1);
			DC_store[j*MB_width+i][1][m] = qcoeff[m+64]*cal_dc_scaler(QP+DQUANT,1);
			DC_store[j*MB_width+i][2][m] = qcoeff[m+128]*cal_dc_scaler(QP+DQUANT,1);
			DC_store[j*MB_width+i][3][m] = qcoeff[m+192]*cal_dc_scaler(QP+DQUANT,1);
			DC_store[j*MB_width+i][4][m] = qcoeff[m+256]*cal_dc_scaler(QP+DQUANT,2);
			DC_store[j*MB_width+i][5][m] = qcoeff[m+320]*cal_dc_scaler(QP+DQUANT,2);
				
			for (m = 1; m < 8; m++)
			{
				DC_store[j*MB_width+i][0][m] = qcoeff[m];
				DC_store[j*MB_width+i][1][m] = qcoeff[m+64];
				DC_store[j*MB_width+i][2][m] = qcoeff[m+128];
				DC_store[j*MB_width+i][3][m] = qcoeff[m+192];
				DC_store[j*MB_width+i][4][m] = qcoeff[m+256];
				DC_store[j*MB_width+i][5][m] = qcoeff[m+320];
			}
			for (m = 0; m < 7; m++)
			{
				DC_store[j*MB_width+i][0][m+8] = qcoeff[(m+1)*8];
				DC_store[j*MB_width+i][1][m+8] = qcoeff[(m+1)*8+64];
				DC_store[j*MB_width+i][2][m+8] = qcoeff[(m+1)*8+128];
				DC_store[j*MB_width+i][3][m+8] = qcoeff[(m+1)*8+192];
				DC_store[j*MB_width+i][4][m+8] = qcoeff[(m+1)*8+256];
				DC_store[j*MB_width+i][5][m+8] = qcoeff[(m+1)*8+320];
			}

			CBP = FindCBP(qcoeff,Mode,64);

			/* Do the DC/AC prediction, changing the qcoeff values as
			   appropriate */
			if (GetVopIntraACDCPredDisable(curr) == 0)
			{
				ACpred_flag = doDCACpred(qcoeff, &CBP, 64, i, j, DC_store,
					QP+DQUANT, MB_width,
					direction,GetVopMidGrey(curr));
			}
			else
				ACpred_flag = -1;

			switched = IntraDCSwitch_Decision(Mode,
				GetVopIntraDCVlcThr(curr),
				QP);
			if (switched)
				CBP = FindCBP(qcoeff,MODE_INTER,64);
			if (DQUANT) Mode=MODE_INTRA_Q;else Mode=MODE_INTRA;

			QP+=DQUANT;

			CBPY = CBP >> 2;
			CBPY = CBPY & 15;			  /* last 4 bits */
			CBPC = CBP & 3;				  /* last 2 bits */

			Bits_CountMB_combined (DQUANT, Mode, COD, ACpred_flag, CBP,
				vop_type,
				bits, mottext_bitstream,/*MB_transp_pattern*/NULL);

			/* added the variable intra_dcpred_diable */
			MB_CodeCoeff(bits, qcoeff, Mode, CBP, 64,
				GetVopIntraACDCPredDisable(curr),
				NULL, mottext_bitstream,
				/*MB_transp_pattern*/NULL, direction,
				1 /*GetVopErrorResDisable(curr)*/,
				0 /*GetVopReverseVlc(curr)*/,
				switched,
				0 /*curr->alternate_scan*/);
		}
	}

	/* Free allocated memory for 3D matrix */
	for (i = 0; i < MB_width*MB_height; i++)
	{
		for (j = 0; j < 6; j++)
			free(DC_store[i][j]);
		free(DC_store[i]);
	}
	free(DC_store);

	free ((Char*)qcoeff);
}

/***********************************************************CommentBegin******
 *
 * -- VopShapeMotText -- Combined Inter encoding of shape motion and texture
 *
 * Purpose :
 *	Combined Inter encoding of texture and motion.
 * 	Used by VopCodeMotTextInter
 *
 * Arguments in :
 *	Vop *curr : the current vop to be encoded
 * 	Vop *rec_prev: the previous reconstructed vop
 * 	Image *mot_x : the x-coordinates of the motion vectors
 * 	Image *mot_y : the y-coordinates of the motion vectors
 * 	Image *MB_decisions: Contains for each macroblock the encoding mode
 *	Int	f_code_for: MV search range 1/2 pel: 1=32,2=64,...,7=2048
 *      Image* AB_SizeConversionDecisions:
 *      Image* AB_first_MMR_values :
 *      Int intra_dcpred_disable : disable the intra dc prediction
 *      VolConfig *vol_config : configuration information
 *      Int rc_type : rate control type
 *
 * Arguments out :
 *	Vop *rec_curr : the reconstructed current vop
 * 	Image *mottext_bitstream : the output texture/motion bitstream
 *  Bits *bits : Coding statistics
 *
 ***********************************************************CommentEnd********/

Void VopShapeMotText (Vop *curr, Vop *comp, 
Image *MB_decisions, Image *mot_x, Image *mot_y,
Int f_code_for, 
Int intra_acdc_pred_disable,
Vop *rec_curr,
Image *mottext_bitstream
)
{
	Int Mode=0;
	Int QP = GetVopQuantizer(curr);
	Int* qcoeff=NULL;
	Int i, j;
	Int CBP;
	Int COD;
	Int CBPY, CBPC;
	Int MB_in_width, MB_in_height, B_in_width, mbnum, boff;
	SInt p;
	SInt *ptr=NULL;
	Float *motx_ptr=NULL, *moty_ptr=NULL;
	Int num_pixels;
	Int num_lines;
	Int vop_type=PCT_INTER;
	Int ***DC_store=NULL;
	Int m, n;
	Int ACpred_flag=-1;
	Int direction[6];
	Int switched=0;
	Int DQUANT=0;

	Bits nbits, *bits;
	bits = &nbits;

	qcoeff = (Int *) malloc (sizeof (Int) * 384);

	num_pixels = GetImageSizeX(GetVopY(curr));
	num_lines = GetImageSizeY(GetVopY(curr));
	MB_in_width = num_pixels / MB_SIZE;
	MB_in_height = num_lines / MB_SIZE;
	B_in_width = 2 * MB_in_width;

	for (i = 0; i < 6; i++) direction[i] = 0;

	#ifdef _RC_DEBUG_
	printf("RC - VopShapeMotText(): ---> CODING WITH: %d \n",QP);
	#endif

	/* allocate space for 3D matrix to keep track of prediction values
	for DC/AC prediction */
	DC_store = (Int ***)calloc(MB_in_width*MB_in_height,
		sizeof(Int **));
	for (i = 0; i < MB_in_width*MB_in_height; i++)
	{
		DC_store[i] = (Int **)calloc(6, sizeof(Int *));
		for (j = 0; j < 6; j++)
			DC_store[i][j] = (Int *)calloc(15, sizeof(Int));
	}

	Bits_Reset (bits);

	vop_type = PCT_INTER;

	ptr = (SInt *) GetImageData(MB_decisions);
	motx_ptr = (Float *) GetImageData(mot_x);
	moty_ptr = (Float *) GetImageData(mot_y);

	for (j = 0; j < num_lines/MB_SIZE; j++)
	{
		for (i = 0; i < MB_in_width; i++)
		{
			switched=0;
			p = *ptr;
			DQUANT = 0;

			/* Fill DC_store with default coeff values */
			for (m = 0; m < 6; m++)
			{
				DC_store[j*MB_in_width+i][m][0] = GetVopMidGrey(curr)*8;
				for (n = 1; n < 15; n++)
					DC_store[j*MB_in_width+i][m][n] = 0;
			}

			switch (p)
			{

				case MBM_INTRA:
					Mode = (DQUANT == 0) ? MODE_INTRA : MODE_INTRA_Q;
					bits->no_intra++;
					break;

				case MBM_INTER16:
					Mode = (DQUANT == 0) ? MODE_INTER : MODE_INTER_Q;
					bits->no_inter++;
					break;

				case MBM_INTER8:
					Mode = MODE_INTER4V;
					bits->no_inter4v++;
					DQUANT = 0;				  /* Can't change QP for 8x8 mode */
					break;

				default:
					printf("invalid MB_decision value :%d\n", p);
					exit(0);
			}

			CodeMB (curr, rec_curr, comp, i*MB_SIZE, j*MB_SIZE,
				num_pixels, QP + DQUANT, Mode, qcoeff);

			mbnum  = j*MB_in_width + i;
			boff = (2 * (mbnum  / MB_in_width) * B_in_width
				+ 2 * (mbnum % MB_in_width));

			CBP = FindCBP(qcoeff,Mode,64);

			if ((CBP == 0) && (p == 1) && (*(motx_ptr +boff) == 0.0)
				&& (*(moty_ptr +boff) == 0.0))
			{
				COD = 1;				  /* skipped macroblock */
				BitstreamPutBits(mottext_bitstream, (long) (COD), 1L);
				bits->COD ++;

				*ptr = SKIPP;
				Mode = MODE_INTER;
			}
			else
			{
				COD = 0;				  /* coded macroblock */

				if ((Mode == MODE_INTRA) || (Mode == MODE_INTRA_Q))
				{

					/* Store the qcoeff-values needed later for prediction */
					m =0;

					DC_store[j*MB_in_width+i][0][m] = qcoeff[m]*cal_dc_scaler(QP+DQUANT,1);
					DC_store[j*MB_in_width+i][1][m] = qcoeff[m+64]*cal_dc_scaler(QP+DQUANT,1);
					DC_store[j*MB_in_width+i][2][m] = qcoeff[m+128]*cal_dc_scaler(QP+DQUANT,1);
					DC_store[j*MB_in_width+i][3][m] = qcoeff[m+192]*cal_dc_scaler(QP+DQUANT,1);
					DC_store[j*MB_in_width+i][4][m] = qcoeff[m+256]*cal_dc_scaler(QP+DQUANT,2);
					DC_store[j*MB_in_width+i][5][m] = qcoeff[m+320]*cal_dc_scaler(QP+DQUANT,2);

					for (m = 1; m < 8; m++)
					{
						DC_store[j*MB_in_width+i][0][m] = qcoeff[m];
						DC_store[j*MB_in_width+i][1][m] = qcoeff[m+64];
						DC_store[j*MB_in_width+i][2][m] = qcoeff[m+128];
						DC_store[j*MB_in_width+i][3][m] = qcoeff[m+192];
						DC_store[j*MB_in_width+i][4][m] = qcoeff[m+256];
						DC_store[j*MB_in_width+i][5][m] = qcoeff[m+320];
					}
					for (m = 0; m < 7; m++)
					{
						DC_store[j*MB_in_width+i][0][m+8] = qcoeff[(m+1)*8];
						DC_store[j*MB_in_width+i][1][m+8] = qcoeff[(m+1)*8+64];
						DC_store[j*MB_in_width+i][2][m+8] = qcoeff[(m+1)*8+128];
						DC_store[j*MB_in_width+i][3][m+8] = qcoeff[(m+1)*8+192];
						DC_store[j*MB_in_width+i][4][m+8] = qcoeff[(m+1)*8+256];
						DC_store[j*MB_in_width+i][5][m+8] = qcoeff[(m+1)*8+320];
					}

					if (intra_acdc_pred_disable == 0)
						ACpred_flag = doDCACpred(qcoeff, &CBP, 64, i, j,
							DC_store,
							QP+DQUANT, MB_in_width,
							direction,GetVopMidGrey(curr));
					else
						ACpred_flag = -1;  /* Not to go into bitstream */
				}

				switched = IntraDCSwitch_Decision(Mode,
					GetVopIntraDCVlcThr(curr),
					QP);
				if (switched)
					CBP = FindCBP(qcoeff,MODE_INTER,64);

				CBPY = CBP >> 2;
				CBPY = CBPY & 15;		  /* last 4 bits */
				CBPC = CBP & 3;			  /* last 2 bits */

				Bits_CountMB_combined (DQUANT, Mode, COD, ACpred_flag, CBP,
					vop_type, bits,
					mottext_bitstream,/*MB_transp_pattern*/NULL);

				Bits_CountMB_Motion( mot_x, mot_y, NULL, 
					MB_decisions, i, j, f_code_for, 0 /*quarter_pel*/,
					mottext_bitstream,
					1 /*GetVopErrorResDisable(curr)*/, 0,
					(Int **)NULL, 0 /*GetVopShape(curr)*/);

				MB_CodeCoeff(bits, qcoeff, Mode, CBP, 64,
					intra_acdc_pred_disable,
					NULL, mottext_bitstream,
					/*MB_transp_pattern*/NULL, direction,
					1/*GetVopErrorResDisable(curr)*/,
					0/*GetVopReverseVlc(curr)*/,
					switched,
					0 /*curr->alternate_scan*/);
			}

			ptr++;

		} /* for i loop */
	} /* for j loop */

	/* Free allocated memory for 3D matrix */
	for (i = 0; i < MB_in_width*MB_in_height; i++)
	{

		for (j = 0; j < 6; j++)
			free(DC_store[i][j]);
		free(DC_store[i]);
	}