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Revision 406 - (download) (annotate)
Wed Sep 4 21:59:27 2002 UTC (17 years ago) by edgomez
File size: 3531 byte(s)
- Added legal header
- Added copyright (temporary set to Michael)
/*****************************************************************************
 *
 *  XVID MPEG-4 VIDEO CODEC
 *  - Global structures, constants -
 *
 *  Copyright(C) 2002 Michael Militzer
 *
 *  This program 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, will have no liability for use of this
 *  software or modifications or derivatives thereof.
 *
 *  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: global.h,v 1.14 2002-09-04 21:59:27 edgomez Exp $
 *
 ****************************************************************************/

#ifndef _GLOBAL_H_
#define _GLOBAL_H_

#include "xvid.h"
#include "portab.h"

/* --- macroblock modes --- */

#define MODE_INTER		0
#define MODE_INTER_Q	1
#define MODE_INTER4V	2
#define	MODE_INTRA		3
#define MODE_INTRA_Q	4
#define MODE_STUFFING	7
#define MODE_NOT_CODED	16

/* --- bframe specific --- */

#define MODE_DIRECT			0
#define MODE_INTERPOLATE	1
#define MODE_BACKWARD		2
#define MODE_FORWARD		3
#define MODE_DIRECT_NONE_MV	4


typedef struct
{
	uint32_t bufa;
	uint32_t bufb;
	uint32_t buf;
	uint32_t pos;
	uint32_t *tail;
	uint32_t *start;
	uint32_t length;
}
Bitstream;


#define MBPRED_SIZE  15


typedef struct
{
	// decoder/encoder 
	VECTOR mvs[4];

	short int pred_values[6][MBPRED_SIZE];
	int acpred_directions[6];

	int mode;
	int quant;					// absolute quant

	int field_dct;
	int field_pred;
	int field_for_top;
	int field_for_bot;

	// encoder specific

	VECTOR mv16;
	VECTOR pmvs[4];

	int32_t sad8[4];			// SAD values for inter4v-VECTORs
	int32_t sad16;				// SAD value for inter-VECTOR

	int dquant;
	int cbp;

	// bframe stuff

	VECTOR b_mvs[4];
	VECTOR b_pmvs[4];

	// bframe direct mode

	VECTOR directmv[4];
	VECTOR deltamv;

	int mb_type;
	int dbquant;

	// stuff for block based ME (needed for Qpel ME)
	// backup of last integer ME vectors/sad
	
	VECTOR i_mv16;
	VECTOR i_mvs[4];

	int32_t i_sad8[4];	// SAD values for inter4v-VECTORs
	int32_t i_sad16;	// SAD value for inter-VECTOR

}
MACROBLOCK;

static __inline int8_t
get_dc_scaler(uint32_t quant,
			  uint32_t lum)
{
	if (quant < 5)
		return 8;

	if (quant < 25 && !lum)
		return (quant + 13) / 2;

	if (quant < 9)
		return 2 * quant;

	if (quant < 25)
		return quant + 8;

	if (lum)
		return 2 * quant - 16;
	else
		return quant - 6;
}

// useful macros

#define MIN(X, Y) ((X)<(Y)?(X):(Y))
#define MAX(X, Y) ((X)>(Y)?(X):(Y))
#define ABS(X)    (((X)>0)?(X):-(X))
#define SIGN(X)   (((X)>0)?1:-1)


#endif /* _GLOBAL_H_ */

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