mqc_inl.h File Reference

Go to the source code of this file.

Macros
#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. More...
#define	opj_mqc_decode(d, mqc)   opj_mqc_decode_macro(d, mqc, mqc->curctx, mqc->a, mqc->c, mqc->ct)
	Decode a symbol. More...

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

Macro Definition Documentation

#define DOWNLOAD_MQC_VARIABLES	(		mqc,
			curctx,
			c,
			a,
			ct
	)

Value:

register 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,
			a
	)

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,
			a
	)

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().