global.h

xvid解码的精简版本.非常好的版本,节省了分离xvid源代码的过程

/*****************************************************************************
 *
 *  XVID MPEG-4 VIDEO CODEC
 *  - Global definitions  -
 *
 *  Copyright(C) 2002 Michael Militzer <[e-mail]>
 *
 *  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 1.24 2005/09/13 12:12:15 suxen_drol 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_NOT_CODED	16
#define MODE_NOT_CODED_GMC	17

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

#define MODE_DIRECT			0
#define MODE_INTERPOLATE	1
#define MODE_BACKWARD		2
#define MODE_FORWARD		3
#define MODE_DIRECT_NONE_MV	4
#define MODE_DIRECT_NO4V	5


/*
 * vop coding types
 * intra, prediction, backward, sprite, not_coded
 */
#define I_VOP	0
#define P_VOP	1
#define B_VOP	2
#define S_VOP	3
#define N_VOP	4

/* convert mpeg-4 coding type i/p/b/s_VOP to XVID_TYPE_xxx */
static __inline int
coding2type(int coding_type)
{
	return coding_type + 1;
}

/* convert XVID_TYPE_xxx to bitstream coding type i/p/b/s_VOP */
static __inline int
type2coding(int xvid_type)
{
	return xvid_type - 1;
}


typedef struct
{
	int x;
	int y;
}
VECTOR;



typedef struct
{
	VECTOR duv[3];
}
WARPPOINTS;

/* save all warping parameters for GMC once and for all, instead of
   recalculating for every block. This is needed for encoding&decoding
   When switching to incremental calculations, this will get much shorter
*/

/*	we don't include WARPPOINTS wp	here, but in FRAMEINFO itself */

typedef struct
{
	int num_wp;		/* [input]: 0=none, 1=translation, 2,3 = warping */
							/* a value of -1 means: "structure not initialized!" */
	int s;					/* [input]: calc is done with 1/s pel resolution */

	int W;
	int H;

	int ss;
	int smask;
	int sigma;

	int r;
	int rho;

	int i0s;
	int j0s;
	int i1s;
	int j1s;
	int i2s;
	int j2s;

	int i1ss;
	int j1ss;
	int i2ss;
	int j2ss;

	int alpha;
	int beta;
	int Ws;
	int Hs;

	int dxF, dyF, dxG, dyG;
	int Fo, Go;
	int cFo, cGo;
} GMC_DATA;

typedef struct _NEW_GMC_DATA
{
   /*  0=none, 1=translation, 2,3 = warping
	*  a value of -1 means: "structure not initialized!" */
	int num_wp;

	/* {0,1,2,3}  =>   {1/2,1/4,1/8,1/16} pel */
	int accuracy;

	/* sprite size * 16 */
	int sW, sH;

	/* gradient, calculated from warp points */
	int dU[2], dV[2], Uo, Vo, Uco, Vco;

	void (*predict_16x16)(const struct _NEW_GMC_DATA * const This,
						  uint8_t *dst, const uint8_t *src,
						  int dststride, int srcstride, int x, int y, int rounding);
	void (*predict_8x8)  (const struct _NEW_GMC_DATA * const This,
						  uint8_t *uDst, const uint8_t *uSrc,
						  uint8_t *vDst, const uint8_t *vSrc,
						  int dststride, int srcstride, int x, int y, int rounding);
	void (*get_average_mv)(const struct _NEW_GMC_DATA * const Dsp, VECTOR * const mv,
						   int x, int y, int qpel);
} NEW_GMC_DATA;

typedef struct
{
	uint8_t *y;
	uint8_t *u;
	uint8_t *v;
}
IMAGE;


typedef struct
{
	uint32_t bufa;
	uint32_t bufb;
	uint32_t buf;
	uint32_t pos;
	uint32_t *tail;
	uint32_t *start;
	uint32_t length;
	uint32_t initpos;
}
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 pmvs[4];
	VECTOR qmvs[4];				/* mvs in quarter pixel resolution */

	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_qmvs[4];

	VECTOR amv; /* average motion vectors from GMC  */
	int32_t mcsel;
	
	VECTOR  mvs_avg;      //CK average of field motion vectors

/* This structure has become way to big! What to do? Split it up?   */

}
MACROBLOCK;

static __inline uint32_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)
#define CLIP(X,AMIN,AMAX)   (((X)<(AMIN)) ? (AMIN) : ((X)>(AMAX)) ? (AMAX) : (X))
#define DIV_DIV(a,b)    (((a)>0) ? ((a)+((b)>>1))/(b) : ((a)-((b)>>1))/(b))
#define SWAP(_T_,A,B)    { _T_ tmp = A; A = B; B = tmp; }


#endif							/* _GLOBAL_H_ */