📄 jpc_cs.h
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/*
* Stepsize manipulation macros.
*/
#define JPC_QCX_GETEXPN(x) ((x) >> 11)
#define JPC_QCX_GETMANT(x) ((x) & 0x07ff)
#define JPC_QCX_EXPN(x) (assert(!((x) & (~0x1f))), (((x) & 0x1f) << 11))
#define JPC_QCX_MANT(x) (assert(!((x) & (~0x7ff))), ((x) & 0x7ff))
/* Per component information. */
typedef struct {
/* The quantization style. */
uint_fast8_t qntsty;
/* The number of step sizes. */
int numstepsizes;
/* The step sizes. */
uint_fast16_t *stepsizes;
/* The number of guard bits. */
uint_fast8_t numguard;
} jpc_qcxcp_t;
/* QCC marker segment parameters. */
typedef struct {
/* The component associated with this marker segment. */
uint_fast16_t compno;
/* The parameters. */
jpc_qcxcp_t compparms;
} jpc_qcc_t;
/* QCD marker segment parameters. */
typedef struct {
/* The parameters. */
jpc_qcxcp_t compparms;
} jpc_qcd_t;
/**************************************\
* POD marker segment parameters.
\**************************************/
typedef struct {
/* The progression order. */
uint_fast8_t prgord;
/* The lower bound (inclusive) on the resolution level for the
progression order volume. */
uint_fast8_t rlvlnostart;
/* The upper bound (exclusive) on the resolution level for the
progression order volume. */
uint_fast8_t rlvlnoend;
/* The lower bound (inclusive) on the component for the progression
order volume. */
uint_fast16_t compnostart;
/* The upper bound (exclusive) on the component for the progression
order volume. */
uint_fast16_t compnoend;
/* The upper bound (exclusive) on the layer for the progression
order volume. */
uint_fast16_t lyrnoend;
} jpc_pocpchg_t;
/* An alias for the above type. */
typedef jpc_pocpchg_t jpc_pchg_t;
/* POC marker segment parameters. */
typedef struct {
/* The number of progression order changes. */
int numpchgs;
/* The per-progression-order-change information. */
jpc_pocpchg_t *pchgs;
} jpc_poc_t;
/**************************************\
* PPM/PPT marker segment parameters.
\**************************************/
/* PPM marker segment parameters. */
typedef struct {
/* The index. */
uint_fast8_t ind;
/* The length. */
uint_fast16_t len;
/* The data. */
uchar *data;
} jpc_ppm_t;
/* PPT marker segment parameters. */
typedef struct {
/* The index. */
uint_fast8_t ind;
/* The length. */
uint_fast32_t len;
/* The data. */
unsigned char *data;
} jpc_ppt_t;
/**************************************\
* COM marker segment parameters.
\**************************************/
/*
* Registration IDs.
*/
#define JPC_COM_BIN 0x00
#define JPC_COM_LATIN 0x01
typedef struct {
/* The registration ID. */
uint_fast16_t regid;
/* The length of the data in bytes. */
uint_fast16_t len;
/* The data. */
uchar *data;
} jpc_com_t;
/**************************************\
* SOP marker segment parameters.
\**************************************/
typedef struct {
/* The sequence number. */
uint_fast16_t seqno;
} jpc_sop_t;
/**************************************\
* CRG marker segment parameters.
\**************************************/
/* Per component information. */
typedef struct {
/* The horizontal offset. */
uint_fast16_t hoff;
/* The vertical offset. */
uint_fast16_t voff;
} jpc_crgcomp_t;
typedef struct {
/* The number of components. */
int numcomps;
/* Per component information. */
jpc_crgcomp_t *comps;
} jpc_crg_t;
/**************************************\
* Marker segment parameters for unknown marker type.
\**************************************/
typedef struct {
/* The data. */
uchar *data;
/* The length. */
uint_fast16_t len;
} jpc_unk_t;
/**************************************\
* Generic marker segment parameters.
\**************************************/
typedef union {
int soc; /* unused */
jpc_sot_t sot;
int sod; /* unused */
int eoc; /* unused */
jpc_siz_t siz;
jpc_cod_t cod;
jpc_coc_t coc;
jpc_rgn_t rgn;
jpc_qcd_t qcd;
jpc_qcc_t qcc;
jpc_poc_t poc;
/* jpc_plm_t plm; */
/* jpc_plt_t plt; */
jpc_ppm_t ppm;
jpc_ppt_t ppt;
jpc_sop_t sop;
int eph; /* unused */
jpc_com_t com;
jpc_crg_t crg;
jpc_unk_t unk;
} jpc_msparms_t;
/**************************************\
* Marker segment.
\**************************************/
/* Marker segment IDs. */
/* The smallest valid marker value. */
#define JPC_MS_MIN 0xff00
/* The largest valid marker value. */
#define JPC_MS_MAX 0xffff
/* The minimum marker value that cannot occur within packet data. */
#define JPC_MS_INMIN 0xff80
/* The maximum marker value that cannot occur within packet data. */
#define JPC_MS_INMAX 0xffff
/* Delimiting marker segments. */
#define JPC_MS_SOC 0xff4f /* Start of code stream (SOC). */
#define JPC_MS_SOT 0xff90 /* Start of tile-part (SOT). */
#define JPC_MS_SOD 0xff93 /* Start of data (SOD). */
#define JPC_MS_EOC 0xffd9 /* End of code stream (EOC). */
/* Fixed information marker segments. */
#define JPC_MS_SIZ 0xff51 /* Image and tile size (SIZ). */
/* Functional marker segments. */
#define JPC_MS_COD 0xff52 /* Coding style default (COD). */
#define JPC_MS_COC 0xff53 /* Coding style component (COC). */
#define JPC_MS_RGN 0xff5e /* Region of interest (RGN). */
#define JPC_MS_QCD 0xff5c /* Quantization default (QCD). */
#define JPC_MS_QCC 0xff5d /* Quantization component (QCC). */
#define JPC_MS_POC 0xff5f /* Progression order default (POC). */
/* Pointer marker segments. */
#define JPC_MS_TLM 0xff55 /* Tile-part lengths, main header (TLM). */
#define JPC_MS_PLM 0xff57 /* Packet length, main header (PLM). */
#define JPC_MS_PLT 0xff58 /* Packet length, tile-part header (PLT). */
#define JPC_MS_PPM 0xff60 /* Packed packet headers, main header (PPM). */
#define JPC_MS_PPT 0xff61 /* Packet packet headers, tile-part header (PPT). */
/* In bit stream marker segments. */
#define JPC_MS_SOP 0xff91 /* Start of packet (SOP). */
#define JPC_MS_EPH 0xff92 /* End of packet header (EPH). */
/* Informational marker segments. */
#define JPC_MS_CRG 0xff63 /* Component registration (CRG). */
#define JPC_MS_COM 0xff64 /* Comment (COM). */
/* Forward declaration. */
struct jpc_msops_s;
/* Generic marker segment class. */
typedef struct {
/* The type of marker segment. */
uint_fast16_t id;
/* The length of the marker segment. */
uint_fast16_t len;
/* The starting offset within the stream. */
uint_fast32_t off;
/* The parameters of the marker segment. */
jpc_msparms_t parms;
/* The marker segment operations. */
struct jpc_msops_s *ops;
} jpc_ms_t;
/* Marker segment operations (which depend on the marker segment type). */
typedef struct jpc_msops_s {
/* Destroy the marker segment parameters. */
void (*destroyparms)(jpc_ms_t *ms);
/* Get the marker segment parameters from a stream. */
int (*getparms)(jpc_ms_t *ms, jpc_cstate_t *cstate, jas_stream_t *in);
/* Put the marker segment parameters to a stream. */
int (*putparms)(jpc_ms_t *ms, jpc_cstate_t *cstate, jas_stream_t *out);
/* Dump the marker segment parameters (for debugging). */
int (*dumpparms)(jpc_ms_t *ms, FILE *out);
} jpc_msops_t;
/******************************************************************************\
* Macros/Functions.
\******************************************************************************/
/* Create a code-stream state object. */
jpc_cstate_t *jpc_cstate_create(void);
/* Destroy a code-stream state object. */
void jpc_cstate_destroy(jpc_cstate_t *cstate);
/* Create a marker segment. */
jpc_ms_t *jpc_ms_create(int type);
/* Destroy a marker segment. */
void jpc_ms_destroy(jpc_ms_t *ms);
/* Does a marker segment have parameters? */
#define JPC_MS_HASPARMS(x) \
(!((x) == JPC_MS_SOC || (x) == JPC_MS_SOD || (x) == JPC_MS_EOC || \
(x) == JPC_MS_EPH || ((x) >= 0xff30 && (x) <= 0xff3f)))
/* Get the marker segment type. */
#define jpc_ms_gettype(ms) \
((ms)->id)
/* Read a marker segment from a stream. */
jpc_ms_t *jpc_getms(jas_stream_t *in, jpc_cstate_t *cstate);
/* Write a marker segment to a stream. */
int jpc_putms(jas_stream_t *out, jpc_cstate_t *cstate, jpc_ms_t *ms);
/* Copy code stream data from one stream to another. */
int jpc_getdata(jas_stream_t *in, jas_stream_t *out, long n);
/* Copy code stream data from one stream to another. */
int jpc_putdata(jas_stream_t *out, jas_stream_t *in, long n);
/* Dump a marker segment (for debugging). */
void jpc_ms_dump(jpc_ms_t *ms, FILE *out);
/* Read a 8-bit unsigned integer from a stream. */
int jpc_getuint8(jas_stream_t *in, uint_fast8_t *val);
/* Read a 16-bit unsigned integer from a stream. */
int jpc_getuint16(jas_stream_t *in, uint_fast16_t *val);
/* Read a 32-bit unsigned integer from a stream. */
int jpc_getuint32(jas_stream_t *in, uint_fast32_t *val);
/* Write a 8-bit unsigned integer to a stream. */
int jpc_putuint8(jas_stream_t *out, uint_fast8_t val);
/* Write a 16-bit unsigned integer to a stream. */
int jpc_putuint16(jas_stream_t *out, uint_fast16_t val);
/* Write a 32-bit unsigned integer to a stream. */
int jpc_putuint32(jas_stream_t *out, uint_fast32_t val);
#endif
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