global.h

H.263的压缩算法

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 int save_frames;
EXTERN char errortext[256];
EXTERN unsigned char *prev_frame[3], *current_frame[3], *bframe[3];
EXTERN unsigned char *tmp_f[3], *tmp_b[3];
EXTERN unsigned char *edgeframe[3], *edgeframeorig[3], *exnewframe[3];
EXTERN unsigned char *nextedgeframe[3], *nextedgeframeorig[3];
EXTERN unsigned char *enhancementedgeframe[3], *enhacnementedgeframeorig[3];
EXTERN unsigned char *next_I_P_frame[3], *prev_I_P_frame[3], *buffered_frame[3];
EXTERN int MV[2][6][MBR + 1][MBC + 2];
EXTERN int true_B_direct_mode_MV[2][5][MBR + 1][MBC + 2];
EXTERN int modemap[MBR + 1][MBC + 2];
EXTERN int anchorframemodemap[MBR + 1][MBC + 2];
EXTERN int predictionmap[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 ref_coded_picture_width, ref_coded_picture_height;
EXTERN int chrom_width, chrom_height, blk_cnt;
EXTERN int ref_chrom_width, ref_chrom_height;
EXTERN int pict_type, newgob, gfid, pgfid;
EXTERN int mv_outside_frame;
EXTERN int syntax_arith_coding;
EXTERN int adv_pred_mode;
EXTERN int overlapping_MC;
EXTERN int use_4mv;
EXTERN int pb_frame;
EXTERN int true_B_frame;
EXTERN int scalability_mode;
EXTERN int buffered_framenum;
EXTERN int long_vectors;
EXTERN int fault, expand;
EXTERN int verbose;
EXTERN int refidct;
EXTERN int matrix_coefficients;
EXTERN int temp_ref, prev_non_disposable_temp_ref, next_non_disposable_temp_ref;
EXTERN int pic_quant, quant, source_format, base_source_format;
EXTERN int UFEP;
EXTERN int prev_mv_outside_frame, prev_sac, prev_adv_pred, prev_aic, prev_df;
EXTERN int prev_slice_struct, prev_rps, prev_isd, prev_aivlc, prev_mq;
EXTERN int prev_4mv, prev_long_vectors, prev_obmc;

/* Following variables are used in H.263+ bitstream decoding */
EXTERN int plus_type;           /* indicates if extended PTYPE exists or
                                 * not. */
EXTERN int optional_custom_PCF;
EXTERN int advanced_intra_coding;
EXTERN int deblocking_filter_mode;
EXTERN int slice_structured_mode;
EXTERN int reference_picture_selection_mode;
EXTERN int independently_segmented_decoding_mode;
EXTERN int alternative_inter_VLC_mode;
EXTERN int modified_quantization_mode;
EXTERN int reduced_resolution_update_mode;
EXTERN int reference_picture_resampling_mode;
EXTERN int rtype;
EXTERN int post_filter;
EXTERN int unlimited_unrestricted_motion_vectors;
EXTERN int concealment;

/* Scalability globals */
EXTERN unsigned char *prev_enhancement_frame[MAX_LAYERS][3], *current_enhancement_frame[MAX_LAYERS][3];
EXTERN unsigned char *curr_reference_frame[3], *upsampled_reference_frame[3];
EXTERN unsigned char *enhance_edgeframeorig[MAX_LAYERS][3], *enhance_edgeframe[MAX_LAYERS][3];
EXTERN unsigned char *tmp_enhance_fwd[MAX_LAYERS][3], *tmp_enhance_up[MAX_LAYERS][3];
EXTERN int enhancement_layer_init[MAX_LAYERS];
EXTERN int enhance_pict;
 
/* custom format variables */
EXTERN int CP_PAR_code;
EXTERN int CP_picture_width_indication;
EXTERN int CP_picture_width;
EXTERN int CP_picture_height_indication;
EXTERN int CP_picture_height;
EXTERN int PAR_width;
EXTERN int PAR_height;

EXTERN int CP_clock_frequency;
EXTERN int SSS_rectangular_slices;
EXTERN int SSS_arbitary_slice_ordering;
EXTERN int enhancement_layer_num;
EXTERN int reference_layer_number;
EXTERN int MF_of_reference_picture_selection;
EXTERN int TRI, TRPI;
EXTERN int temporal_reference_for_prediction;

#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, true_b_trb;
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
;

EXTERN int MQ_chroma_QP_table[32]
#ifdef GLOBAL
 = {0, 1, 2, 3, 4, 5, 6, 6, 7, 8, 9, 9, 10, 10, 11, 11, 12, 12, 12, 13, 13, 13, 
14, 14, 14, 14, 14, 15, 15, 15, 15, 15}
#endif
;

/* output */
EXTERN char *outputname;
EXTERN char trace_file_name[100];
EXTERN FILE *trace_file;
EXTERN char recon_file_name[100];
EXTERN FILE *recon_file_ptr;
EXTERN char enhance_recon_file_name[MAX_LAYERS][100];
EXTERN FILE *enhance_recon_file_ptr[MAX_LAYERS];

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 */
  int infile;
  unsigned char rdbfr[2051];
  unsigned char *rdptr;
  unsigned char inbfr[16];
  int incnt;
  int bitcnt;
  /* block data */
  short block[12][64];
} base, *ld;


/* For reference picture selection Mode  (Annex N) */

#define RING_SIZE 8

EXTERN int   ring_pointer;               /* pointer - to last picture */
EXTERN void *ring_lum[RING_SIZE];    /* luminance */
EXTERN void *ring_Cr[RING_SIZE];     /* chominance */
EXTERN void *ring_Cb[RING_SIZE];
EXTERN int   ring_temporal_reference[RING_SIZE];     /* TR values for the pictures */
EXTERN int   ring_quality[RING_SIZE];     /* picture quality */
EXTERN int   stop_decoder;           /* flag if we completely out of sync */

/* Back Channel Message Structure */
/* used with Annex N with Videomux channel */
EXTERN struct bcm 
{
  int present;           /* set to 1 if bcm is present */
  int BT;                /* Back-channel message type (2 bits) */
  int URF;               /* Unreliable flag (1 bit) */
  int TR;                /* Temporal reference (10 bits) */
  int ELNUMI;            /* Enhancement layer number indication (1 bit) */
  int ELNUM;             /* Enhancement layer number (4 bits) */
  int BCPM;              /* Indicates that BSBI is present (1 bit) */
  int BSPI;              /* Back-channel sub bitstream indicator (2 bits) */
  int BEPB1;             /* Back-channel emulation prevention bit 1 (1 bit set to 1 */
  int GN_MBA;            /* GOB number / Macroblock address (variable length) */
  int BEPB2;             /* Back-channel emulation prevention bit 2 (1 bit set to 1 */
  int RTR;               /* Requested temporal reference (10 bits) */
  int BSTUF;             /* stuffing (variable length) */
} BCM;