#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

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
{
	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;
}
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];
	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];

	int mb_type;
	int dbquant;

	// stuff for block based ME (needed for Qpel ME)
	// backup of last integer ME vectors/sad

	VECTOR amv; // average motion vectors from GMC 
	int32_t mcsel;

/* 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))


#endif							/* _GLOBAL_H_ */