tarith_decoder_jpeg2000.h

利用ADI公司 Blackfin dsp实现 jpeg2

/*****************************************************************************
File name   : arith_decoder.h
Description : This file contains required strcture definition and initialization
              of probability table.  
*****************************************************************************/
#define PRINTF_SUPPORT
#define MAX_PERMISSIBLE_ERROR 0
#define RUNLENGTH_CX 17
#define UNIFORM_CX 18
#define MAX_CONTEXTS 18
#define MAX_PAIR     512

typedef struct
{
int I;    // Index value for each context
int MPS;  // Most Probable Symbol (either 0 or 1) for each context
}arith_context;

// strcture which contains required registers tp process arithmetic encoder
segment ("mydata2") struct mqdec
{
int A;               // interval register A  (0,75<= A <1,5)
int C;               // code register 
int CT;              // bit counter 
int  B;              // to hold byte value 
unsigned char *input;// Address of input buffer where compressed data stored
unsigned char *out;  // address where compressed bytes are stored
}dec_reg;

segment ("mydata1") typedef struct mqstate
{
    int Qe;             // LPS probability
    int NMPS;           // Next MPS index
    int NLPS;           // Next LPS index 
    int SWITCH;         // To change MPS to LPS and vice versa
}mqstate_s;


segment ("mydata2") arith_context contexts[MAX_CONTEXTS+1];

segment ("mydata1") mqstate_s mqstates[47]=
{
    {0x5601,1, 1 ,1},
    {0x3401,2, 6, 0},
    {0x1801,3, 9, 0},
    {0x0AC1,4, 12,0},
    {0x0521,5, 29,0},
    {0x0221,38,33,0},
    {0x5601,7, 6 ,1},
    {0x5401,8, 14,0},
    {0x4801,9, 14,0},
    {0x3801,10,14,0},
    {0x3001,11,17,0},
    {0x2401,12,18,0},
    {0x1C01,13,20,0},
    {0x1601,29,21,0},
    {0x5601,15,14,1},
    {0x5401,16,14,0},
    {0x5101,17,15,0},
    {0x4801,18,16,0},
    {0x3801,19,17,0},
    {0x3401,20,18,0},
    {0x3001,21,19,0},
    {0x2801,22,19,0},
    {0x2401,23,20,0},
    {0x2201,24,21,0},
    {0x1C01,25,22,0},
    {0x1801,26,23,0},
    {0x1601,27,24,0},
    {0x1401,28,25,0},
    {0x1201,29,26,0},
    {0x1101,30,27,0},
    {0x0AC1,31,28,0},
    {0x09C1,32,29,0},
    {0x08A1,33,30,0},
    {0x0521,34,31,0},
    {0x0441,35,32,0},
    {0x02A1,36,33,0},
    {0x0221,37,34,0},
    {0x0141,38,35,0},
    {0x0111,39,36,0},
    {0x0085,40,37,0},
    {0x0049,41,38,0},
    {0x0025,42,39,0},
    {0x0015,43,40,0},
    {0x0009,44,41,0},
    {0x0005,45,42,0},
    {0x0001,45,43,0},
    {0x5601,46,46,0}};