OpenJPEG
2.4.0
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Data Structures | |
struct | opj_mqc_state |
This struct defines the state of a context. More... | |
struct | opj_mqc |
MQ coder More... | |
Macros | |
#define | MQC_NUMCTXS 19 |
#define | BYPASS_CT_INIT 0xDEADBEEF |
Typedefs | |
typedef struct opj_mqc_state | opj_mqc_state_t |
This struct defines the state of a context. More... | |
typedef struct opj_mqc | opj_mqc_t |
MQ coder More... | |
Local static functions | |
static void | opj_mqc_setbits (opj_mqc_t *mqc) |
Fill mqc->c with 1's for flushing More... | |
Exported functions | |
OPJ_UINT32 | opj_mqc_numbytes (opj_mqc_t *mqc) |
Return the number of bytes written/read since initialisation More... | |
void | opj_mqc_resetstates (opj_mqc_t *mqc) |
Reset the states of all the context of the coder/decoder (each context is set to a state where 0 and 1 are more or less equiprobable) More... | |
void | opj_mqc_setstate (opj_mqc_t *mqc, OPJ_UINT32 ctxno, OPJ_UINT32 msb, OPJ_INT32 prob) |
Set the state of a particular context More... | |
void | opj_mqc_init_enc (opj_mqc_t *mqc, OPJ_BYTE *bp) |
Initialize the encoder More... | |
void | opj_mqc_flush (opj_mqc_t *mqc) |
Flush the encoder, so that all remaining data is written More... | |
void | opj_mqc_bypass_init_enc (opj_mqc_t *mqc) |
BYPASS mode switch, initialization operation. More... | |
OPJ_UINT32 | opj_mqc_bypass_get_extra_bytes (opj_mqc_t *mqc, OPJ_BOOL erterm) |
Return number of extra bytes to add to opj_mqc_numbytes() for the² size of a non-terminating BYPASS pass. More... | |
void | opj_mqc_bypass_enc (opj_mqc_t *mqc, OPJ_UINT32 d) |
BYPASS mode switch, coding operation. More... | |
void | opj_mqc_bypass_flush_enc (opj_mqc_t *mqc, OPJ_BOOL erterm) |
BYPASS mode switch, flush operation More... | |
void | opj_mqc_reset_enc (opj_mqc_t *mqc) |
RESET mode switch More... | |
void | opj_mqc_restart_init_enc (opj_mqc_t *mqc) |
RESTART mode switch (TERMALL) reinitialisation More... | |
void | opj_mqc_erterm_enc (opj_mqc_t *mqc) |
ERTERM mode switch (PTERM) More... | |
void | opj_mqc_segmark_enc (opj_mqc_t *mqc) |
SEGMARK mode switch (SEGSYM) More... | |
void | opj_mqc_init_dec (opj_mqc_t *mqc, OPJ_BYTE *bp, OPJ_UINT32 len, OPJ_UINT32 extra_writable_bytes) |
Initialize the decoder for MQ decoding. More... | |
void | opj_mqc_raw_init_dec (opj_mqc_t *mqc, OPJ_BYTE *bp, OPJ_UINT32 len, OPJ_UINT32 extra_writable_bytes) |
Initialize the decoder for RAW decoding. More... | |
void | opq_mqc_finish_dec (opj_mqc_t *mqc) |
Terminate RAW/MQC decoding More... | |
#define | opj_mqc_setcurctx(mqc, ctxno) (mqc)->curctx = &(mqc)->ctxs[(OPJ_UINT32)(ctxno)] |
Set the current context used for coding/decoding More... | |
#define BYPASS_CT_INIT 0xDEADBEEF |
Referenced by opj_mqc_bypass_enc(), and opj_mqc_bypass_init_enc().
#define MQC_NUMCTXS 19 |
Referenced by opj_mqc_resetstates().
#define opj_mqc_setcurctx | ( | mqc, | |
ctxno | |||
) | (mqc)->curctx = &(mqc)->ctxs[(OPJ_UINT32)(ctxno)] |
Set the current context used for coding/decoding
mqc | MQC handle |
ctxno | Number that identifies the context |
Referenced by opj_mqc_init_dec(), opj_mqc_init_enc(), opj_mqc_segmark_enc(), and opj_t1_dec_clnpass_check_segsym().
typedef struct opj_mqc_state opj_mqc_state_t |
This struct defines the state of a context.
void opj_mqc_bypass_enc | ( | opj_mqc_t * | mqc, |
OPJ_UINT32 | d | ||
) |
BYPASS mode switch, coding operation.
JPEG 2000 p 505.
mqc | MQC handle |
d | The symbol to be encoded (0 or 1) |
References opj_mqc::bp, BYPASS_CT_INIT, opj_mqc::c, and opj_mqc::ct.
BYPASS mode switch, flush operation
mqc | MQC handle |
erterm | 1 if ERTERM is enabled, 0 otherwise |
References opj_mqc::bp, opj_mqc::c, and opj_mqc::ct.
Referenced by opj_t1_encode_cblk().
OPJ_UINT32 opj_mqc_bypass_get_extra_bytes | ( | opj_mqc_t * | mqc, |
OPJ_BOOL | erterm | ||
) |
Return number of extra bytes to add to opj_mqc_numbytes() for the² size of a non-terminating BYPASS pass.
mqc | MQC handle |
erterm | 1 if ERTERM is enabled, 0 otherwise |
References opj_mqc::bp, and opj_mqc::ct.
Referenced by opj_t1_encode_cblk().
void opj_mqc_bypass_init_enc | ( | opj_mqc_t * | mqc | ) |
BYPASS mode switch, initialization operation.
JPEG 2000 p 505.
mqc | MQC handle |
References opj_mqc::bp, BYPASS_CT_INIT, opj_mqc::c, opj_mqc::ct, and opj_mqc::start.
Referenced by opj_t1_encode_cblk().
void opj_mqc_erterm_enc | ( | opj_mqc_t * | mqc | ) |
ERTERM mode switch (PTERM)
mqc | MQC handle |
References opj_mqc::bp, opj_mqc::c, opj_mqc::ct, and opj_mqc_byteout().
Referenced by opj_t1_encode_cblk().
void opj_mqc_flush | ( | opj_mqc_t * | mqc | ) |
Flush the encoder, so that all remaining data is written
mqc | MQC handle |
References opj_mqc::bp, opj_mqc::c, opj_mqc::ct, opj_mqc_byteout(), and opj_mqc_setbits().
Referenced by opj_t1_encode_cblk().
void opj_mqc_init_dec | ( | opj_mqc_t * | mqc, |
OPJ_BYTE * | bp, | ||
OPJ_UINT32 | len, | ||
OPJ_UINT32 | extra_writable_bytes | ||
) |
Initialize the decoder for MQ decoding.
opj_mqc_finish_dec() must be absolutely called after finishing the decoding passes, so as to restore the bytes temporarily overwritten.
mqc | MQC handle |
bp | Pointer to the start of the buffer from which the bytes will be read Note that OPJ_COMMON_CBLK_DATA_EXTRA bytes at the end of the buffer will be temporarily overwritten with an artificial 0xFF 0xFF marker. (they will be backuped in the mqc structure to be restored later) So bp must be at least len + OPJ_COMMON_CBLK_DATA_EXTRA large, and writable. |
len | Length of the input buffer |
extra_writable_bytes | Indicate how many bytes after len are writable. This is to indicate your consent that bp must be large enough. |
References opj_mqc::a, opj_mqc::bp, opj_mqc::c, opj_mqc::ct, opj_mqc::end_of_byte_stream_counter, opj_mqc_bytein(), opj_mqc_init_dec_common(), and opj_mqc_setcurctx.
Referenced by opj_t1_decode_cblk().
Initialize the encoder
mqc | MQC handle |
bp | Pointer to the start of the buffer where the bytes will be written |
References opj_mqc::a, opj_mqc::bp, opj_mqc::c, opj_mqc::ct, opj_mqc::end_of_byte_stream_counter, opj_mqc_setcurctx, and opj_mqc::start.
Referenced by opj_t1_encode_cblk().
OPJ_UINT32 opj_mqc_numbytes | ( | opj_mqc_t * | mqc | ) |
Return the number of bytes written/read since initialisation
mqc | MQC handle |
References opj_mqc::bp, and opj_mqc::start.
Referenced by opj_t1_encode_cblk().
void opj_mqc_raw_init_dec | ( | opj_mqc_t * | mqc, |
OPJ_BYTE * | bp, | ||
OPJ_UINT32 | len, | ||
OPJ_UINT32 | extra_writable_bytes | ||
) |
Initialize the decoder for RAW decoding.
opj_mqc_finish_dec() must be absolutely called after finishing the decoding passes, so as to restore the bytes temporarily overwritten.
mqc | MQC handle |
bp | Pointer to the start of the buffer from which the bytes will be read Note that OPJ_COMMON_CBLK_DATA_EXTRA bytes at the end of the buffer will be temporarily overwritten with an artificial 0xFF 0xFF marker. (they will be backuped in the mqc structure to be restored later) So bp must be at least len + OPJ_COMMON_CBLK_DATA_EXTRA large, and writable. |
len | Length of the input buffer |
extra_writable_bytes | Indicate how many bytes after len are writable. This is to indicate your consent that bp must be large enough. |
References opj_mqc::c, opj_mqc::ct, and opj_mqc_init_dec_common().
Referenced by opj_t1_decode_cblk().
void opj_mqc_reset_enc | ( | opj_mqc_t * | mqc | ) |
RESET mode switch
mqc | MQC handle |
References opj_mqc_resetstates(), opj_mqc_setstate(), T1_CTXNO_AGG, T1_CTXNO_UNI, and T1_CTXNO_ZC.
Referenced by opj_t1_encode_cblk().
void opj_mqc_resetstates | ( | opj_mqc_t * | mqc | ) |
Reset the states of all the context of the coder/decoder (each context is set to a state where 0 and 1 are more or less equiprobable)
mqc | MQC handle |
References opj_mqc::ctxs, MQC_NUMCTXS, and mqc_states.
Referenced by opj_mqc_reset_enc(), opj_t1_decode_cblk(), and opj_t1_encode_cblk().
void opj_mqc_restart_init_enc | ( | opj_mqc_t * | mqc | ) |
RESTART mode switch (TERMALL) reinitialisation
mqc | MQC handle |
References opj_mqc::a, opj_mqc::bp, opj_mqc::c, opj_mqc::ct, and opj_mqc::start.
Referenced by opj_t1_encode_cblk().
void opj_mqc_segmark_enc | ( | opj_mqc_t * | mqc | ) |
SEGMARK mode switch (SEGSYM)
mqc | MQC handle |
References opj_mqc_encode(), and opj_mqc_setcurctx.
Referenced by opj_t1_encode_cblk().
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static |
Fill mqc->c with 1's for flushing
mqc | MQC handle |
References opj_mqc::a, and opj_mqc::c.
Referenced by opj_mqc_flush().
void opj_mqc_setstate | ( | opj_mqc_t * | mqc, |
OPJ_UINT32 | ctxno, | ||
OPJ_UINT32 | msb, | ||
OPJ_INT32 | prob | ||
) |
Set the state of a particular context
mqc | MQC handle |
ctxno | Number that identifies the context |
msb | The MSB of the new state of the context |
prob | Number that identifies the probability of the symbols for the new state of the context |
References opj_mqc::ctxs, and mqc_states.
Referenced by opj_mqc_reset_enc(), opj_t1_decode_cblk(), and opj_t1_encode_cblk().
void opq_mqc_finish_dec | ( | opj_mqc_t * | mqc | ) |
Terminate RAW/MQC decoding
This restores the bytes temporarily overwritten by opj_mqc_init_dec()/ opj_mqc_raw_init_dec()
mqc | MQC handle |
References opj_mqc::backup, opj_mqc::end, and OPJ_COMMON_CBLK_DATA_EXTRA.
Referenced by opj_t1_decode_cblk().