mqc_inl.h File Reference

Go to the source code of this file.

Defines

#define opj_mqc_mpsexchange_macro(d, curctx, a)
#define opj_mqc_lpsexchange_macro(d, curctx, a)
#define opj_mqc_bytein_macro(mqc, c, ct)
#define opj_mqc_renormd_macro(mqc, a, c, ct)
#define opj_mqc_decode_macro(d, mqc, curctx, a, c, ct)
#define DOWNLOAD_MQC_VARIABLES(mqc, curctx, c, a, ct)
#define UPLOAD_MQC_VARIABLES(mqc, curctx, c, a, ct)
#define opj_mqc_renormd(mqc)   opj_mqc_renormd_macro(mqc, mqc->a, mqc->c, mqc->ct)
 Renormalize mqc->a and mqc->c while decoding.
#define opj_mqc_decode(d, mqc)   opj_mqc_decode_macro(d, mqc, mqc->curctx, mqc->a, mqc->c, mqc->ct)
 Decode a symbol.

Functions

static INLINE OPJ_UINT32 opj_mqc_raw_decode (opj_mqc_t *mqc)
 Decode a symbol using raw-decoder.
static INLINE void opj_mqc_bytein (opj_mqc_t *const mqc)
 Input a byte.

Define Documentation

#define DOWNLOAD_MQC_VARIABLES ( mqc,
curctx,
c,
a,
ct   ) 
Value:
register const opj_mqc_state_t **curctx = mqc->curctx; \
        register OPJ_UINT32 c = mqc->c; \
        register OPJ_UINT32 a = mqc->a; \
        register OPJ_UINT32 ct = mqc->ct
#define opj_mqc_bytein_macro ( mqc,
c,
ct   ) 
Value:
{ \
        OPJ_UINT32 l_c;  \
        /* Given opj_mqc_init_dec() we know that at some point we will */ \
        /* have a 0xFF 0xFF artificial marker */ \
        l_c = *(mqc->bp + 1); \
        if (*mqc->bp == 0xff) { \
            if (l_c > 0x8f) { \
                c += 0xff00; \
                ct = 8; \
                mqc->end_of_byte_stream_counter ++; \
            } else { \
                mqc->bp++; \
                c += l_c << 9; \
                ct = 7; \
            } \
        } else { \
            mqc->bp++; \
            c += l_c << 8; \
            ct = 8; \
        } \
}

Referenced by opj_mqc_bytein().

#define opj_mqc_decode ( d,
mqc   )     opj_mqc_decode_macro(d, mqc, mqc->curctx, mqc->a, mqc->c, mqc->ct)

Decode a symbol.

Parameters:
d OPJ_UINT32 value where to store the decoded symbol
mqc MQC handle
Returns:
Returns the decoded symbol (0 or 1) in d

Referenced by opj_t1_dec_clnpass_check_segsym().

#define opj_mqc_decode_macro ( d,
mqc,
curctx,
a,
c,
ct   ) 
Value:
{ \
    /* Implements ISO 15444-1 C.3.2 Decoding a decision (DECODE) */ \
    /* Note: alternate "J.2 - Decoding an MPS or an LPS in the */ \
    /* software-conventions decoder" has been tried, but does not bring any */ \
    /* improvement. See https://github.com/uclouvain/openjpeg/issues/921 */ \
    a -= (*curctx)->qeval;  \
    if ((c >> 16) < (*curctx)->qeval) {  \
        opj_mqc_lpsexchange_macro(d, curctx, a);  \
        opj_mqc_renormd_macro(mqc, a, c, ct);  \
    } else {  \
        c -= (*curctx)->qeval << 16;  \
        if ((a & 0x8000) == 0) { \
            opj_mqc_mpsexchange_macro(d, curctx, a); \
            opj_mqc_renormd_macro(mqc, a, c, ct); \
        } else { \
            d = (*curctx)->mps; \
        } \
    } \
}
#define opj_mqc_lpsexchange_macro ( d,
curctx,
 ) 
Value:
{ \
    if (a < (*curctx)->qeval) { \
        a = (*curctx)->qeval; \
        d = (*curctx)->mps; \
        *curctx = (*curctx)->nmps; \
    } else { \
        a = (*curctx)->qeval; \
        d = !((*curctx)->mps); \
        *curctx = (*curctx)->nlps; \
    } \
}
#define opj_mqc_mpsexchange_macro ( d,
curctx,
 ) 
Value:
{ \
    if (a < (*curctx)->qeval) { \
        d = !((*curctx)->mps); \
        *curctx = (*curctx)->nlps; \
    } else { \
        d = (*curctx)->mps; \
        *curctx = (*curctx)->nmps; \
    } \
}
#define opj_mqc_renormd ( mqc   )     opj_mqc_renormd_macro(mqc, mqc->a, mqc->c, mqc->ct)

Renormalize mqc->a and mqc->c while decoding.

Parameters:
mqc MQC handle
#define opj_mqc_renormd_macro ( mqc,
a,
c,
ct   ) 
Value:
{ \
    do { \
        if (ct == 0) { \
            opj_mqc_bytein_macro(mqc, c, ct); \
        } \
        a <<= 1; \
        c <<= 1; \
        ct--; \
    } while (a < 0x8000); \
}
#define UPLOAD_MQC_VARIABLES ( mqc,
curctx,
c,
a,
ct   ) 
Value:
mqc->curctx = curctx; \
        mqc->c = c; \
        mqc->a = a; \
        mqc->ct = ct;

Function Documentation

static INLINE void opj_mqc_bytein ( opj_mqc_t *const   mqc  )  [static]

Input a byte.

Parameters:
mqc MQC handle

References opj_mqc::c, opj_mqc::ct, and opj_mqc_bytein_macro.

Referenced by opj_mqc_init_dec().

static INLINE OPJ_UINT32 opj_mqc_raw_decode ( opj_mqc_t mqc  )  [static]

Decode a symbol using raw-decoder.

Cfr p.506 TAUBMAN

Parameters:
mqc MQC handle
Returns:
Returns the decoded symbol (0 or 1)

References opj_mqc::bp, opj_mqc::c, and opj_mqc::ct.

Referenced by opj_t1_dec_refpass_step_raw(), and opj_t1_dec_sigpass_step_raw().


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