* Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
* Copyright (c) 2005, Herve Drolon, FreeImage Team
* Copyright (c) 2006-2007, Parvatha Elangovan
+ * Copyright (c) 2010-2011, Kaori Hagihara
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
#endif /* OPJ_EXPORTS */
#endif /* !OPJ_STATIC || !_WIN32 */
-#ifndef __cplusplus
-#if defined(HAVE_STDBOOL_H)
-/*
-The C language implementation does correctly provide the standard header
-file "stdbool.h".
- */
-#include <stdbool.h>
-#else
-/*
-The C language implementation does not provide the standard header file
-"stdbool.h" as required by ISO/IEC 9899:1999. Try to compensate for this
-braindamage below.
-*/
-#if !defined(bool)
-#define bool int
-#endif
-#if !defined(true)
-#define true 1
-#endif
-#if !defined(false)
-#define false 0
-#endif
-#endif
-#endif /* __cplusplus */
+typedef int opj_bool;
+#define OPJ_TRUE 1
+#define OPJ_FALSE 0
+
+typedef unsigned int OPJ_UINT32;
+typedef int OPJ_INT32;
+typedef unsigned short OPJ_UINT16;
+typedef short OPJ_INT16;
+typedef char OPJ_CHAR;
+typedef unsigned char OPJ_BYTE;
+typedef unsigned int OPJ_SIZE_T;
+typedef double OPJ_FLOAT64;
+typedef float OPJ_FLOAT32;
+
+// Avoid compile-time warning because parameter is not used
+#define OPJ_ARG_NOT_USED(x) (void)(x)
/*
==========================================================
#define J2K_MAXRLVLS 33 /**< Number of maximum resolution level authorized */
#define J2K_MAXBANDS (3*J2K_MAXRLVLS-2) /**< Number of maximum sub-band linked to number of resolution level */
+#define J2K_DEFAULT_NB_SEGS 10
+#define J2K_STREAM_CHUNK_SIZE 0x100000 /** 1 mega by default */
+#define J2K_DEFAULT_HEADER_SIZE 1000
+#define J2K_MCC_DEFAULT_NB_RECORDS 10
+#define J2K_MCT_DEFAULT_NB_RECORDS 10
+
/* UniPG>> */
#define JPWL_MAX_NO_TILESPECS 16 /**< Maximum number of tile parts expected by JPWL: increase at your will */
#define JPWL_MAX_NO_PACKSPECS 16 /**< Maximum number of packet parts expected by JPWL: increase at your will */
#define JPWL_MAXIMUM_EPB_ROOM 65450 /**< Expect this maximum number of bytes for composition of EPBs */
/* <<UniPG */
+/**
+Supported options about file information
+*/
+#define OPJ_NO_INFO 0x0 /**< No information provied to the user */
+#define OPJ_IMG_INFO 0x1 /**< Basic image information provided to the user */
+#define OPJ_J2K_INFO 0x2 /**< J2K codestream information provided to the user */
+#define OPJ_JP2_INFO 0x4 /**< JP2 file information provided to the user */
+
+
/*
==========================================================
enum definitions
*/
typedef enum CODEC_FORMAT {
CODEC_UNKNOWN = -1, /**< place-holder */
- CODEC_J2K = 0, /**< JPEG-2000 codestream : read/write */
- CODEC_JPT = 1, /**< JPT-stream (JPEG 2000, JPIP) : read only */
- CODEC_JP2 = 2 /**< JPEG-2000 file format : read/write */
+ CODEC_J2K = 0, /**< JPEG-2000 codestream : read/write */
+ CODEC_JPT = 1, /**< JPT-stream (JPEG 2000, JPIP) : read only */
+ CODEC_JP2 = 2, /**< JPEG-2000 file format : read/write */
} OPJ_CODEC_FORMAT;
/**
DECODE_ALL_BUT_PACKETS = 2 /**< Decode everything except the JPEG 2000 packets */
} OPJ_LIMIT_DECODING;
+
+
+
/*
==========================================================
event manager typedef definitions
</ul>
*/
typedef struct opj_event_mgr {
+ void* client_data;
/** Error message callback if available, NULL otherwise */
opj_msg_callback error_handler;
/** Warning message callback if available, NULL otherwise */
*/
typedef struct opj_cparameters {
/** size of tile: tile_size_on = false (not in argument) or = true (in argument) */
- bool tile_size_on;
+ opj_bool tile_size_on;
/** XTOsiz */
int cp_tx0;
/** YTOsiz */
/**@name JPWL encoding parameters */
/*@{*/
/** enables writing of EPC in MH, thus activating JPWL */
- bool jpwl_epc_on;
+ opj_bool jpwl_epc_on;
/** error protection method for MH (0,1,16,32,37-128) */
int jpwl_hprot_MH;
/** tile number of header protection specification (>=0) */
char tp_flag;
/** MCT (multiple component transform) */
char tcp_mct;
+ /** Enable JPIP indexing*/
+ opj_bool jpip_on;
} opj_cparameters_t;
/**
/**@name JPWL decoding parameters */
/*@{*/
/** activates the JPWL correction capabilities */
- bool jpwl_correct;
+ opj_bool jpwl_correct;
/** expected number of components */
int jpwl_exp_comps;
/** maximum number of tiles */
*/
OPJ_LIMIT_DECODING cp_limit_decoding;
+
+ /* V2 */
+ OPJ_UINT32 ROI_x0;
+ OPJ_UINT32 ROI_x1;
+ OPJ_UINT32 ROI_y0;
+ OPJ_UINT32 ROI_y1;
+
+
} opj_dparameters_t;
/** Common fields between JPEG-2000 compression and decompression master structs. */
#define opj_common_fields \
opj_event_mgr_t *event_mgr; /**< pointer to the event manager */\
void * client_data; /**< Available for use by application */\
- bool is_decompressor; /**< So common code can tell which is which */\
+ opj_bool is_decompressor; /**< So common code can tell which is which */\
OPJ_CODEC_FORMAT codec_format; /**< selected codec */\
void *j2k_handle; /**< pointer to the J2K codec */\
void *jp2_handle; /**< pointer to the JP2 codec */\
/* other specific fields go here */
} opj_dinfo_t;
+/**
+ * J2k codec.
+ */
+typedef void * opj_codec_t;
+
/*
==========================================================
I/O stream typedef definitions
unsigned char *bp;
} opj_cio_t;
+typedef OPJ_UINT32 (* opj_stream_read_fn) (void * p_buffer, OPJ_UINT32 p_nb_bytes, void * p_user_data) ;
+typedef OPJ_UINT32 (* opj_stream_write_fn) (void * p_buffer, OPJ_UINT32 p_nb_bytes, void * p_user_data) ;
+typedef OPJ_SIZE_T (* opj_stream_skip_fn) (OPJ_SIZE_T p_nb_bytes, void * p_user_data) ;
+typedef opj_bool (* opj_stream_seek_fn) (OPJ_SIZE_T p_nb_bytes, void * p_user_data) ;
+
+
+typedef void * opj_stream_t;
+
/*
==========================================================
image typedef definitions
*/
typedef struct opj_image {
/** XOsiz: horizontal offset from the origin of the reference grid to the left side of the image area */
- int x0;
+ OPJ_UINT32 x0;
/** YOsiz: vertical offset from the origin of the reference grid to the top side of the image area */
- int y0;
+ OPJ_UINT32 y0;
/** Xsiz: width of the reference grid */
- int x1;
+ OPJ_UINT32 x1;
/** Ysiz: height of the reference grid */
- int y1;
+ OPJ_UINT32 y1;
/** number of components in the image */
- int numcomps;
+ OPJ_UINT16 numcomps;
/** color space: sRGB, Greyscale or YUV */
OPJ_COLOR_SPACE color_space;
/** image components */
opj_image_comp_t *comps;
+ /** 'restricted' ICC profile */
+ unsigned char *icc_profile_buf;
+ /** size of ICC profile */
+ int icc_profile_len;
} opj_image_t;
+
/**
Component parameters structure used by the opj_image_create function
*/
int sgnd;
} opj_image_cmptparm_t;
+
+
+/**
+Defines a single image component characteristics (uses in new API)
+*/
+typedef struct opj_image_comp_header {
+ /** XRsiz: horizontal separation of a sample of ith component with respect to the reference grid */
+ int dx;
+ /** YRsiz: vertical separation of a sample of ith component with respect to the reference grid */
+ int dy;
+ /** data width */
+ int w;
+ /** data height */
+ int h;
+ /** x component offset compared to the whole image */
+ int x0;
+ /** y component offset compared to the whole image */
+ int y0;
+ /** precision */
+ int prec;
+ /** image depth in bits */
+ int bpp;
+ /** signed (1) / unsigned (0) */
+ int sgnd;
+ /** number of decoded resolution */
+ int resno_decoded;
+ /** number of division by 2 of the out image compared to the original size of image */
+ int factor;
+} opj_image_comp_header_t;
+
+/**
+Defines image characteristics (uses in new API)
+*/
+typedef struct opj_image_header {
+ /** XOsiz: horizontal offset from the origin of the reference grid to the left side of the image area */
+ OPJ_UINT32 x0;
+ /** YOsiz: vertical offset from the origin of the reference grid to the top side of the image area */
+ OPJ_UINT32 y0;
+ /** Xsiz: width of the reference grid */
+ OPJ_UINT32 x1;
+ /** Ysiz: height of the reference grid */
+ OPJ_UINT32 y1;
+ /** number of components in the image */
+ OPJ_UINT16 numcomps;
+ /** color space: sRGB, Greyscale or YUV */
+ OPJ_COLOR_SPACE color_space;
+ /** image components */
+ opj_image_comp_header_t *comps;
+
+#ifdef TODO_MSD
+ /** XTOsiz */
+ OPJ_UINT32 tile_x0;
+ /** YTOsiz */
+ OPJ_UINT32 tile_y0;
+ /** XTsiz */
+ OPJ_UINT32 tile_width;
+ /** YTsiz */
+ OPJ_UINT32 tile_height;
+ /** number of tiles in width */
+ OPJ_UINT32 nb_tiles_x;
+ /** number of tiles in height */
+ OPJ_UINT32 nb_tiles_y;
+#endif
+
+ /** 'restricted' ICC profile */
+ unsigned char *icc_profile_buf;
+ /** size of ICC profile */
+ int icc_profile_len;
+} opj_image_header_t;
+
+
/*
==========================================================
Information on the JPEG 2000 codestream
double disto;
} opj_packet_info_t;
+
+/* UniPG>> */
+/**
+Marker structure
+*/
+typedef struct opj_marker_info_t {
+ /** marker type */
+ unsigned short int type;
+ /** position in codestream */
+ int pos;
+ /** length, marker val included */
+ int len;
+} opj_marker_info_t;
+/* <<UniPG */
+
/**
Index structure : Information concerning tile-parts
*/
int numpix;
/** add fixed_quality */
double distotile;
+ /** number of markers */
+ int marknum;
+ /** list of markers */
+ opj_marker_info_t *marker;
+ /** actual size of markers array */
+ int maxmarknum;
/** number of tile parts */
int num_tps;
/** information concerning tile parts */
opj_tp_info_t *tp;
} opj_tile_info_t;
-/* UniPG>> */
-/**
-Marker structure
-*/
-typedef struct opj_marker_info_t {
- /** marker type */
- unsigned short int type;
- /** position in codestream */
- int pos;
- /** length, marker val included */
- int len;
-} opj_marker_info_t;
-/* <<UniPG */
-
/**
Index structure of the codestream
*/
opj_tile_info_t *tile;
} opj_codestream_info_t;
+// NEW codestream
+
+/**
+Tile-component coding parameters
+*/
+typedef struct opj_tccp_info
+{
+ /** component index */
+ OPJ_UINT32 compno;
+ /** coding style */
+ OPJ_UINT32 csty;
+ /** number of resolutions */
+ OPJ_UINT32 numresolutions;
+ /** code-blocks width */
+ OPJ_UINT32 cblkw;
+ /** code-blocks height */
+ OPJ_UINT32 cblkh;
+ /** code-block coding style */
+ OPJ_UINT32 cblksty;
+ /** discrete wavelet transform identifier */
+ OPJ_UINT32 qmfbid;
+ /** quantisation style */
+ OPJ_UINT32 qntsty;
+ /** stepsizes used for quantization */
+ //FIXME opj_stepsize_t stepsizes[J2K_MAXBANDS];
+ /** number of guard bits */
+ OPJ_UINT32 numgbits;
+ /** Region Of Interest shift */
+ OPJ_INT32 roishift;
+ /** precinct width */
+ OPJ_UINT32 prcw[J2K_MAXRLVLS];
+ /** precinct height */
+ OPJ_UINT32 prch[J2K_MAXRLVLS];
+}
+opj_tccp_info_t;
+
+typedef struct opj_tile_v2_info {
+
+ /** number (index) of tile */
+ int tileno;
+
+ /** start position */
+ int start_pos;
+ /** end position of the header */
+ int end_header;
+ /** end position */
+ int end_pos;
+
+ /** add fixed_quality */
+ int numpix;
+ /** add fixed_quality */
+ double distotile;
+
+ /** coding style */
+ OPJ_UINT32 csty;
+ /** progression order */
+ OPJ_PROG_ORDER prg;
+ /** number of layers */
+ OPJ_UINT32 numlayers;
+ /** multi-component transform identifier */
+ OPJ_UINT32 mct;
+ /** rates of layers */
+ OPJ_FLOAT32 rates[100];
+
+ /** precinct number for each resolution level (width) */
+ int pw[33];
+ /** precinct number for each resolution level (height) */
+ int ph[33];
+ /** precinct size (in power of 2), in X for each resolution level */
+ int pdx[33];
+ /** precinct size (in power of 2), in Y for each resolution level */
+ int pdy[33];
+ /** information concerning packets inside tile */
+ opj_packet_info_t *packet;
+
+
+ /** number of tile parts */
+ int num_tps;
+ /** information concerning tile parts */
+ opj_tp_info_t *tp;
+
+ /** information concerning tile component parameters*/
+ opj_tccp_info_t *tccp_info;
+
+ /** value of thresh for each layer by tile cfr. Marcela */
+ double *thresh;
+} opj_tile_info_v2_t;
+
+/**
+Index structure of the codestream
+*/
+typedef struct opj_codestream_info_v2 {
+ /* Basic image info */
+ /** image width */
+ int image_w;
+ /** image height */
+ int image_h;
+ /** numbers of component */
+ int numcomps;
+
+ /* Codestream Info */
+ /** progression order */
+ OPJ_PROG_ORDER prog;
+ /** number of layer */
+ int numlayers;
+
+ /** tile origin in x */
+ int tx0;
+ /** tile origin in y */
+ int ty0;
+ /** tile size in x */
+ int tdx;
+ /** tile size in y */
+ int tdy;
+ /** number of tiles in X */
+ int tw;
+ /** number of tiles in Y */
+ int th;
+
+ /** number of decomposition for each component */
+ int *numdecompos;
+
+ /** maximum distortion reduction on the whole image (add for Marcela) */
+ double D_max;
+ /** packet number */
+ int packno;
+ /** writing the packet in the index with t2_encode_packets */
+ int index_write;
+
+
+
+/* UniPG>> */
+ /** number of markers */
+ int marknum;
+ /** list of markers */
+ opj_marker_info_t *marker;
+ /** actual size of markers array */
+ int maxmarknum;
+/* <<UniPG */
+
+ /** main header position */
+ int main_head_start;
+ /** main header position */
+ int main_head_end;
+ /** codestream's size */
+ int codestream_size;
+
+ /** information regarding tiles inside image */
+ opj_tile_info_v2_t *tile;
+} opj_codestream_info_v2_t;
+
+
+/*
+==========================================================
+ Metadata from the JP2file
+==========================================================
+*/
+
+/**
+Info structure of the file
+*/
+typedef struct opj_jp2_metadata {
+ /** */
+ OPJ_INT32 empty_fields;
+
+} opj_jp2_metadata_t;
+
+/*
+==========================================================
+ Information on the JPEG2000 file
+==========================================================
+*/
+
+/**
+Info structure of the file
+*/
+typedef struct opj_file_info {
+ /** file format */
+ OPJ_INT32 file_format;
+ /** file info level*/
+ OPJ_INT32 file_info_flag;
+ /** image info*/
+ opj_image_header_t img_info;
+ /** codestream info */
+ opj_codestream_info_v2_t codestream_info;
+ /** file info */
+ opj_jp2_metadata_t jp2_metadata;
+
+} opj_file_info_t;
+
+
+
#ifdef __cplusplus
extern "C" {
#endif
*/
OPJ_API void OPJ_CALLCONV opj_image_destroy(opj_image_t *image);
+OPJ_API void OPJ_CALLCONV opj_image_header_destroy(opj_image_header_t *image_header);
+
/*
==========================================================
stream functions definitions
*/
OPJ_API void OPJ_CALLCONV cio_seek(opj_cio_t *cio, int pos);
+
+/**
+ * Creates an abstract stream. This function does nothing except allocating memory and initializing the abstract stream.
+ *
+ * @param l_is_reader if set to true then the stream will be an input stream, an output stream else.
+ *
+ * @return a stream object.
+*/
+OPJ_API opj_stream_t* OPJ_CALLCONV opj_stream_default_create(opj_bool p_is_input);
+OPJ_API opj_stream_t* OPJ_CALLCONV opj_stream_create(OPJ_UINT32 p_size, opj_bool p_is_input);
+
+/**
+ * Destroys a stream created by opj_create_stream. This function does NOT close the abstract stream. If needed the user must
+ * close its own implementation of the stream.
+ *
+ * @param p_stream the stream to destroy.
+ */
+OPJ_API void OPJ_CALLCONV opj_stream_destroy(opj_stream_t* p_stream);
+
+/**
+ * Sets the given function to be used as a read function.
+ * @param p_stream the stream to modify
+ * @param p_function the function to use a read function.
+*/
+OPJ_API void OPJ_CALLCONV opj_stream_set_read_function(opj_stream_t* p_stream, opj_stream_read_fn p_function);
+
+/**
+ * Sets the given function to be used as a write function.
+ * @param p_stream the stream to modify
+ * @param p_function the function to use a write function.
+*/
+OPJ_API void OPJ_CALLCONV opj_stream_set_write_function(opj_stream_t* p_stream, opj_stream_write_fn p_function);
+
+/**
+ * Sets the given function to be used as a skip function.
+ * @param p_stream the stream to modify
+ * @param p_function the function to use a skip function.
+*/
+OPJ_API void OPJ_CALLCONV opj_stream_set_skip_function(opj_stream_t* p_stream, opj_stream_skip_fn p_function);
+
+/**
+ * Sets the given function to be used as a seek function, the stream is then seekable.
+ * @param p_stream the stream to modify
+ * @param p_function the function to use a skip function.
+*/
+OPJ_API void OPJ_CALLCONV opj_stream_set_seek_function(opj_stream_t* p_stream, opj_stream_seek_fn p_function);
+
+
+/**
+ * Sets the given data to be used as a user data for the stream.
+ * @param p_stream the stream to modify
+ * @param p_data the data to set.
+*/
+OPJ_API void OPJ_CALLCONV opj_stream_set_user_data (opj_stream_t* p_stream, void * p_data);
+
+
+/**
+ * Helper function.
+ * Sets the stream to be a file stream. The FILE must have been open previously.
+ * @param p_stream the stream to modify
+ * @param p_file handler to an already open file.
+*/
+OPJ_API opj_stream_t* OPJ_CALLCONV opj_stream_create_default_file_stream (FILE * p_file, opj_bool p_is_read_stream);
+OPJ_API opj_stream_t* OPJ_CALLCONV opj_stream_create_file_stream (FILE * p_file, OPJ_UINT32 p_buffer_size, opj_bool p_is_read_stream);
+
+
+
/*
==========================================================
event manager functions definitions
codec functions definitions
==========================================================
*/
+/**
+Creates a J2K/JPT/JP2 decompression structure
+@param format Decoder to select
+@return Returns a handle to a decompressor if successful, returns NULL otherwise
+*/
+OPJ_API opj_codec_t* OPJ_CALLCONV opj_create_decompress_v2(OPJ_CODEC_FORMAT format);
+
+
/**
Creates a J2K/JPT/JP2 decompression structure
@param format Decoder to select
@param parameters decompression parameters
*/
OPJ_API void OPJ_CALLCONV opj_setup_decoder(opj_dinfo_t *dinfo, opj_dparameters_t *parameters);
+
+OPJ_API opj_bool OPJ_CALLCONV opj_setup_decoder_v2( opj_codec_t *p_info,
+ opj_dparameters_t *parameters,
+ opj_event_mgr_t* event_mgr);
+
/**
Decode an image from a JPEG-2000 codestream
@param dinfo decompressor handle
OPJ_API void OPJ_CALLCONV opj_setup_encoder(opj_cinfo_t *cinfo, opj_cparameters_t *parameters, opj_image_t *image);
/**
Encode an image into a JPEG-2000 codestream
-@param cinfo compressor handle
+3@param cinfo compressor handle
@param cio Output buffer stream
@param image Image to encode
@param index Depreacted -> Set to NULL. To extract index, used opj_encode_wci()
@return Returns true if successful, returns false otherwise
*/
-OPJ_API bool OPJ_CALLCONV opj_encode(opj_cinfo_t *cinfo, opj_cio_t *cio, opj_image_t *image, char *index);
+OPJ_API opj_bool OPJ_CALLCONV opj_encode(opj_cinfo_t *cinfo, opj_cio_t *cio, opj_image_t *image, char *index);
/**
Encode an image into a JPEG-2000 codestream and extract the codestream information
@param cinfo compressor handle
@param cstr_info Codestream information structure if needed afterwards, NULL otherwise
@return Returns true if successful, returns false otherwise
*/
-OPJ_API bool OPJ_CALLCONV opj_encode_with_info(opj_cinfo_t *cinfo, opj_cio_t *cio, opj_image_t *image, opj_codestream_info_t *cstr_info);
+OPJ_API opj_bool OPJ_CALLCONV opj_encode_with_info(opj_cinfo_t *cinfo, opj_cio_t *cio, opj_image_t *image, opj_codestream_info_t *cstr_info);
/**
Destroy Codestream information after compression or decompression
@param cstr_info Codestream information structure
*/
OPJ_API void OPJ_CALLCONV opj_destroy_cstr_info(opj_codestream_info_t *cstr_info);
+
+/**
+ * Decodes an image header.
+ *
+ * @param p_codec codec to use to decode the image.
+ * @param p_image pointer to a previously created image.
+ * @param p_tile_x0 pointer to a value that will hold the reference point x0 of the tiling grid.
+ * @param p_tile_y0 pointer to a value that will hold the reference point y0 of the tiling grid.
+ * @param p_tile_width pointer to a value that will hold the size in x of a tile in the grid.
+ * @param p_tile_height pointer to a value that will hold the size in y of a tile in the grid.
+ * @param p_nb_tiles_x pointer to a value that will hold the number of tiles in the x direction.
+ * @param p_nb_tiles_y pointer to a value that will hold the number of tiles in the y direction.
+ */
+OPJ_API opj_bool OPJ_CALLCONV opj_read_header ( opj_stream_t *p_cio,
+ opj_codec_t *p_codec,
+ opj_file_info_t * p_file_info,
+ OPJ_INT32 file_info_flag);
+
+/**
+Destroy a decompressor handle
+@param dinfo decompressor handle to destroy
+*/
+OPJ_API void OPJ_CALLCONV opj_destroy_codec(opj_codec_t * p_codec);
+
+/**
+ * Sets the given area to be decoded. This function should be called right after opj_read_header and before any tile header reading.
+ *
+ * @param p_codec the jpeg2000 codec.
+ * @param p_start_x the left position of the rectangle to decode (in image coordinates).
+ * @param p_end_x the right position of the rectangle to decode (in image coordinates).
+ * @param p_start_y the up position of the rectangle to decode (in image coordinates).
+ * @param p_end_y the bottom position of the rectangle to decode (in image coordinates).
+ *
+ * @return true if the area could be set.
+ */
+OPJ_API opj_bool OPJ_CALLCONV opj_set_decode_area( opj_codec_t *p_codec,
+ OPJ_INT32 p_start_x, OPJ_INT32 p_start_y,
+ OPJ_INT32 p_end_x, OPJ_INT32 p_end_y );
+
+/**
+ * Reads a tile header. This function is compulsory and allows one to know the size of the tile thta will be decoded.
+ * The user may need to refer to the image got by opj_read_header to understand the size being taken by the tile.
+ *
+ * @param p_codec the jpeg2000 codec.
+ * @param p_tile_index pointer to a value that will hold the index of the tile being decoded, in case of success.
+ * @param p_data_size pointer to a value that will hold the maximum size of the decoded data, in case of success. In case
+ * of truncated codestreams, the actual number of bytes decoded may be lower. The computation of the size is the same
+ * as depicted in opj_write_tile.
+ * @param p_tile_x0 pointer to a value that will hold the x0 pos of the tile (in the image).
+ * @param p_tile_y0 pointer to a value that will hold the y0 pos of the tile (in the image).
+ * @param p_tile_x1 pointer to a value that will hold the x1 pos of the tile (in the image).
+ * @param p_tile_y1 pointer to a value that will hold the y1 pos of the tile (in the image).
+ * @param p_nb_comps pointer to a value that will hold the number of components in the tile.
+ * @param p_should_go_on pointer to a boolean that will hold the fact that the decoding should go on. In case the
+ * codestream is over at the time of the call, the value will be set to false. The user should then stop
+ * the decoding.
+ * @param p_stream the stream to decode.
+ * @return true if the tile header could be decoded. In case the decoding should end, the returned value is still true.
+ * returning false may be the result of a shortage of memory or an internal error.
+ */
+OPJ_API opj_bool OPJ_CALLCONV opj_read_tile_header( opj_codec_t *p_codec,
+ opj_stream_t * p_stream,
+ OPJ_UINT32 * p_tile_index,
+ OPJ_UINT32 * p_data_size,
+ OPJ_INT32 * p_tile_x0, OPJ_INT32 * p_tile_y0,
+ OPJ_INT32 * p_tile_x1, OPJ_INT32 * p_tile_y1,
+ OPJ_UINT32 * p_nb_comps,
+ opj_bool * p_should_go_on );
+
#ifdef __cplusplus
}
#endif
#endif /* OPENJPEG_H */
+
+