global.h

音视频编解码的H.263协议-C语言编写

/* choose between declaration (GLOBAL undefined)
 * and definition (GLOBAL defined)
 * GLOBAL is defined in exactly one file (tmndec.c)
 */

#ifndef GLOBAL
#define EXTERN extern
#else
#define EXTERN
#endif

/* Some macros */
#define mmax(a, b)        ((a) > (b) ? (a) : (b))
#define mmin(a, b)        ((a) < (b) ? (a) : (b))
#define mnint(a)        ((a) < 0 ? (int)(a - 0.5) : (int)(a + 0.5))
#define sign(a)         ((a) < 0 ? -1 : 1)

/* prototypes of global functions */

/* getbits.c */
void initbits(void);
void fillbfr(void);
unsigned int showbits(int n);
unsigned int getbits1(void);
void flushbits(int n);
unsigned int getbits(int n);

/* getblk.c */
void getblock(int comp, int mode);
void get_sac_block(int comp, int mode);

/* gethdr.c */
int getheader(void);
void startcode(void);

/* getpic.c */
void getpicture(int *framenum);
void putlast(int framenum);

/* getvlc.c */
int getTMNMV(void);
int getMCBPC(void);
int getMODB(void);
int getMCBPCintra(void);
int getCBPY(void);

/* idct.c */
void idct(short *block);
void init_idct(void);

/* idctref.c */
void init_idctref(void);
void idctref(short *block);

/* tmndec.c */
void error(char *text);
void printbits(int code, int bits, int len);

/* recon.c */
void reconstruct(int bx, int by, int P, int bdx, int bdy);

/* store.c */
void storeframe(unsigned char *src[], int frame);

/* sac.c */
int decode_a_symbol(int cumul_freq[ ]);
void decoder_reset( );

void init_display(int);
void exit_display(void);
void dither(unsigned char *src[]);
void init_dither(void);

/* dither.c */
void ord4x4_dither_init(void);
void ord4x4_dither_frame(unsigned char *[], unsigned char *);

/* yuv2rgb.c */
void Color16DitherImage(unsigned char *[], unsigned char *);
void Color32DitherImage(unsigned char *[], unsigned char *);
void InitColorDither(int);
/* yuvrgb24.c */
void ConvertYUVtoRGB(
  unsigned char *src0,
  unsigned char *src1,
  unsigned char *src2,
  unsigned char *dst_ori,
  int width,
  int height
);



/* global variables */

EXTERN char version[]
#ifdef GLOBAL
  ="tmndecode v2.0\n(C) 1995, 1996 Telenor R&D, Norway\n"
#endif
;

/* zig-zag scan */
EXTERN unsigned char zig_zag_scan[64]
#ifdef GLOBAL
=
{
  0,1,8,16,9,2,3,10,17,24,32,25,18,11,4,5,
  12,19,26,33,40,48,41,34,27,20,13,6,7,14,21,28,
  35,42,49,56,57,50,43,36,29,22,15,23,30,37,44,51,
  58,59,52,45,38,31,39,46,53,60,61,54,47,55,62,63
}
#endif
;


/* color space conversion coefficients
 *
 * entries are {crv,cbu,cgu,cgv}
 *
 * crv=(255/224)*65536*(1-cr)/0.5
 * cbu=(255/224)*65536*(1-cb)/0.5
 * cgu=(255/224)*65536*(cb/cg)*(1-cb)/0.5
 * cgv=(255/224)*65536*(cr/cg)*(1-cr)/0.5
 *
 * where Y=cr*R+cg*G+cb*B (cr+cg+cb=1)
 */

EXTERN int convmat[8][4]
#ifdef GLOBAL
=
{
  {117504, 138453, 13954, 34903}, /* no sequence_display_extension */
  {117504, 138453, 13954, 34903}, /* ITU-R Rec. 709 (1990) */
  {104597, 132201, 25675, 53279}, /* unspecified */
  {104597, 132201, 25675, 53279}, /* reserved */
  {104448, 132798, 24759, 53109}, /* FCC */
  {104597, 132201, 25675, 53279}, /* ITU-R Rec. 624-4 System B, G */
  {104597, 132201, 25675, 53279}, /* SMPTE 170M */
  {117579, 136230, 16907, 35559}  /* SMPTE 240M (1987) */
}
#endif
;

EXTERN int quiet;
EXTERN int trace;
EXTERN char errortext[256];
EXTERN unsigned char *refframe[3],*oldrefframe[3],*bframe[3],*newframe[3];
EXTERN unsigned char *edgeframe[3], *edgeframeorig[3], *exnewframe[3];
EXTERN int MV[2][5][MBR+1][MBC+2];
EXTERN int modemap[MBR+1][MBC+2];
EXTERN unsigned char *clp;
EXTERN int horizontal_size,vertical_size,mb_width,mb_height;
EXTERN int coded_picture_width, coded_picture_height;
EXTERN int chrom_width,chrom_height,blk_cnt;
EXTERN int pict_type,newgob;
EXTERN int mv_outside_frame,syntax_arith_coding,adv_pred_mode,pb_frame;
EXTERN int long_vectors;
EXTERN int fault,expand;
EXTERN int verbose;
EXTERN int refidct;
EXTERN int matrix_coefficients;
EXTERN int temp_ref, prev_temp_ref, quant, source_format;
#ifdef USE_TIME
EXTERN int framerate;
#ifndef WIN32
EXTERN struct timeval tftarget;
#else
EXTERN unsigned int targetTime;
#endif
#endif


EXTERN int trd, trb, bscan, bquant;
EXTERN int bscan_tab[]
#ifdef GLOBAL
= {2,4,6,8}
#endif
;
EXTERN int bquant_tab[]
#ifdef GLOBAL
= {5,6,7,8}
#endif
;

EXTERN int OM[5][8][8]
#ifdef GLOBAL
= {
{
  {4,5,5,5,5,5,5,4},
  {5,5,5,5,5,5,5,5},
  {5,5,6,6,6,6,5,5},
  {5,5,6,6,6,6,5,5},
  {5,5,6,6,6,6,5,5},
  {5,5,6,6,6,6,5,5},
  {5,5,5,5,5,5,5,5},
  {4,5,5,5,5,5,5,4},
},{
  {2,2,2,2,2,2,2,2},
  {1,1,2,2,2,2,1,1},
  {1,1,1,1,1,1,1,1},
  {1,1,1,1,1,1,1,1},
  {0,0,0,0,0,0,0,0},
  {0,0,0,0,0,0,0,0},
  {0,0,0,0,0,0,0,0},
  {0,0,0,0,0,0,0,0},
},{
  {0,0,0,0,0,0,0,0},
  {0,0,0,0,0,0,0,0},
  {0,0,0,0,0,0,0,0},
  {0,0,0,0,0,0,0,0},
  {1,1,1,1,1,1,1,1},
  {1,1,1,1,1,1,1,1},
  {1,1,2,2,2,2,1,1},
  {2,2,2,2,2,2,2,2},
},{
  {0,0,0,0,1,1,1,2},
  {0,0,0,0,1,1,2,2},
  {0,0,0,0,1,1,2,2},
  {0,0,0,0,1,1,2,2},
  {0,0,0,0,1,1,2,2},
  {0,0,0,0,1,1,2,2},
  {0,0,0,0,1,1,2,2},
  {0,0,0,0,1,1,1,2},
},{
  {2,1,1,1,0,0,0,0},
  {2,2,1,1,0,0,0,0},
  {2,2,1,1,0,0,0,0},
  {2,2,1,1,0,0,0,0},
  {2,2,1,1,0,0,0,0},
  {2,2,1,1,0,0,0,0},
  {2,2,1,1,0,0,0,0},
  {2,1,1,1,0,0,0,0},
}}
#endif
;

EXTERN int roundtab[16]
#ifdef GLOBAL
=  {0,0,0,1,1,1,1,1,1,1,1,1,1,1,2,2}
#endif
;

/* output */
EXTERN char *outputname;
EXTERN int outtype;
#define T_YUV      0
#define T_SIF      1
#define T_TGA      2
#define T_PPM      3
#define T_X11      4
#define T_YUV_CONC 5
#define T_WIN      6

EXTERN struct _ld {
  /* bit input */
  unsigned char *InData;
  unsigned char *OutData;
  int		InFrameSize;
  unsigned char rdbfr[2051];
  unsigned char *rdptr;
  unsigned char inbfr[16];
  int incnt;
  int bitcnt;
  /* block data */
  short block[12][64];
};

EXTERN struct _ld *ld;