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openjpeg/OPJViewer/source/imagmj2.cpp

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/*
* Copyright (c) 2007, Digital Signal Processing Laboratory, Università degli studi di Perugia (UPG), Italy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/////////////////////////////////////////////////////////////////////////////
// Name: imagmj2.cpp
// Purpose: wxImage Motion JPEG 2000 file format handler
// Author: Giuseppe Baruffa - based on imagjpeg.cpp, Vaclav Slavik
// RCS-ID: $Id: imagmj2.cpp,v 0.00 2007/02/18 23:59:00 MW Exp $
// Copyright: (c) Giuseppe Baruffa
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#if wxUSE_IMAGE && wxUSE_LIBOPENJPEG
#include "imagmj2.h"
#ifndef WX_PRECOMP
#include "wx/log.h"
#include "wx/app.h"
#include "wx/intl.h"
#include "wx/bitmap.h"
#include "wx/module.h"
#endif
#include "libopenjpeg/openjpeg.h"
#include "wx/filefn.h"
#include "wx/wfstream.h"
// ----------------------------------------------------------------------------
// types
// ----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// wxMJ2Handler
//-----------------------------------------------------------------------------
IMPLEMENT_DYNAMIC_CLASS(wxMJ2Handler,wxImageHandler)
#if wxUSE_STREAMS
//------------- JPEG 2000 Data Source Manager
#define J2K_CFMT 0
#define JP2_CFMT 1
#define JPT_CFMT 2
#define MJ2_CFMT 3
#define PXM_DFMT 0
#define PGX_DFMT 1
#define BMP_DFMT 2
#define YUV_DFMT 3
#define MAX_MESSAGE_LEN 200
/* sample error callback expecting a FILE* client object */
void mj2_error_callback(const char *msg, void *client_data) {
int message_len = strlen(msg) - 1;
if (msg[message_len] != '\n')
message_len = MAX_MESSAGE_LEN;
#ifndef __WXGTK__
wxMutexGuiEnter();
#endif /* __WXGTK__ */
wxLogMessage(wxT("[ERROR] %.*s"), message_len, msg);
#ifndef __WXGTK__
wxMutexGuiLeave();
#endif /* __WXGTK__ */
}
/* sample warning callback expecting a FILE* client object */
void mj2_warning_callback(const char *msg, void *client_data) {
int message_len = strlen(msg) - 1;
if (msg[message_len] != '\n')
message_len = MAX_MESSAGE_LEN;
#ifndef __WXGTK__
wxMutexGuiEnter();
#endif /* __WXGTK__ */
wxLogMessage(wxT("[WARNING] %.*s"), message_len, msg);
#ifndef __WXGTK__
wxMutexGuiLeave();
#endif /* __WXGTK__ */
}
/* sample debug callback expecting no client object */
void mj2_info_callback(const char *msg, void *client_data) {
int message_len = strlen(msg) - 1;
if (msg[message_len] != '\n')
message_len = MAX_MESSAGE_LEN;
#ifndef __WXGTK__
wxMutexGuiEnter();
#endif /* __WXGTK__ */
wxLogMessage(wxT("[INFO] %.*s"), message_len, msg);
#ifndef __WXGTK__
wxMutexGuiLeave();
#endif /* __WXGTK__ */
}
/* macro functions */
/* From little endian to big endian, 2 and 4 bytes */
#define BYTE_SWAP2(X) ((X & 0x00FF) << 8) | ((X & 0xFF00) >> 8)
#define BYTE_SWAP4(X) ((X & 0x000000FF) << 24) | ((X & 0x0000FF00) << 8) | ((X & 0x00FF0000) >> 8) | ((X & 0xFF000000) >> 24)
#ifdef __WXGTK__
#define BYTE_SWAP8(X) ((X & 0x00000000000000FFULL) << 56) | ((X & 0x000000000000FF00ULL) << 40) | \
((X & 0x0000000000FF0000ULL) << 24) | ((X & 0x00000000FF000000ULL) << 8) | \
((X & 0x000000FF00000000ULL) >> 8) | ((X & 0x0000FF0000000000ULL) >> 24) | \
((X & 0x00FF000000000000ULL) >> 40) | ((X & 0xFF00000000000000ULL) >> 56)
#else
#define BYTE_SWAP8(X) ((X & 0x00000000000000FF) << 56) | ((X & 0x000000000000FF00) << 40) | \
((X & 0x0000000000FF0000) << 24) | ((X & 0x00000000FF000000) << 8) | \
((X & 0x000000FF00000000) >> 8) | ((X & 0x0000FF0000000000) >> 24) | \
((X & 0x00FF000000000000) >> 40) | ((X & 0xFF00000000000000) >> 56)
#endif
/* From codestream to int values */
#define STREAM_TO_UINT32(C, P) (((unsigned long int) (C)[(P) + 0] << 24) + \
((unsigned long int) (C)[(P) + 1] << 16) + \
((unsigned long int) (C)[(P) + 2] << 8) + \
((unsigned long int) (C)[(P) + 3] << 0))
#define STREAM_TO_UINT16(C, P) (((unsigned long int) (C)[(P) + 0] << 8) + \
((unsigned long int) (C)[(P) + 1] << 0))
/* defines */
#define SHORT_DESCR_LEN 32
#define LONG_DESCR_LEN 256
/* enumeration for file formats */
#define J2FILENUM 4
typedef enum {
JP2_FILE,
J2K_FILE,
MJ2_FILE,
UNK_FILE
} my_j2filetype;
/* enumeration for the box types */
#define J2BOXNUM 23
typedef enum {
FILE_BOX,
JP_BOX,
FTYP_BOX,
JP2H_BOX,
IHDR_BOX,
COLR_BOX,
JP2C_BOX,
JP2I_BOX,
XML_BOX,
UUID_BOX,
UINF_BOX,
MOOV_BOX,
MVHD_BOX,
TRAK_BOX,
TKHD_BOX,
MDIA_BOX,
MINF_BOX,
STBL_BOX,
STSD_BOX,
MJP2_BOX,
MDAT_BOX,
ANY_BOX,
UNK_BOX
} my_j2boxtype;
/* jp2 family box signatures */
#define FILE_SIGN ""
#define JP_SIGN "jP\040\040"
#define FTYP_SIGN "ftyp"
#define JP2H_SIGN "jp2h"
#define IHDR_SIGN "ihdr"
#define COLR_SIGN "colr"
#define JP2C_SIGN "jp2c"
#define JP2I_SIGN "jp2i"
#define XML_SIGN "xml\040"
#define UUID_SIGN "uuid"
#define UINF_SIGN "uinf"
#define MOOV_SIGN "moov"
#define MVHD_SIGN "mvhd"
#define TRAK_SIGN "trak"
#define TKHD_SIGN "tkhd"
#define MDIA_SIGN "mdia"
#define MINF_SIGN "minf"
#define VMHD_SIGN "vmhd"
#define STBL_SIGN "stbl"
#define STSD_SIGN "stsd"
#define MJP2_SIGN "mjp2"
#define MDAT_SIGN "mdat"
#define ANY_SIGN ""
#define UNK_SIGN ""
/* the box structure itself */
struct my_boxdef {
char value[5]; /* hexadecimal value/string*/
char name[SHORT_DESCR_LEN]; /* short description */
char descr[LONG_DESCR_LEN]; /* long description */
int sbox; /* is it a superbox? */
int req[J2FILENUM]; /* mandatory box */
my_j2boxtype ins; /* contained in box... */
};
/* the possible boxes */
struct my_boxdef j2box[] =
{
/* sign */ {FILE_SIGN,
/* short */ "placeholder for nothing",
/* long */ "Nothing to say",
/* sbox */ 0,
/* req */ {1, 1, 1},
/* ins */ FILE_BOX},
/* sign */ {JP_SIGN,
/* short */ "JPEG 2000 Signature box",
/* long */ "This box uniquely identifies the file as being part of the JPEG 2000 family of files",
/* sbox */ 0,
/* req */ {1, 1, 1},
/* ins */ FILE_BOX},
/* sign */ {FTYP_SIGN,
/* short */ "File Type box",
/* long */ "This box specifies file type, version and compatibility information, including specifying if this file "
"is a conforming JP2 file or if it can be read by a conforming JP2 reader",
/* sbox */ 0,
/* req */ {1, 1, 1},
/* ins */ FILE_BOX},
/* sign */ {JP2H_SIGN,
/* short */ "JP2 Header box",
/* long */ "This box contains a series of boxes that contain header-type information about the file",
/* sbox */ 1,
/* req */ {1, 1, 1},
/* ins */ FILE_BOX},
/* sign */ {IHDR_SIGN,
/* short */ "Image Header box",
/* long */ "This box specifies the size of the image and other related fields",
/* sbox */ 0,
/* req */ {1, 1, 1},
/* ins */ JP2H_BOX},
/* sign */ {COLR_SIGN,
/* short */ "Colour Specification box",
/* long */ "This box specifies the colourspace of the image",
/* sbox */ 0,
/* req */ {1, 1, 1},
/* ins */ JP2H_BOX},
/* sign */ {JP2C_SIGN,
/* short */ "Contiguous Codestream box",
/* long */ "This box contains the codestream as defined by Annex A",
/* sbox */ 0,
/* req */ {1, 1, 1},
/* ins */ FILE_BOX},
/* sign */ {JP2I_SIGN,
/* short */ "Intellectual Property box",
/* long */ "This box contains intellectual property information about the image",
/* sbox */ 0,
/* req */ {0, 0, 0},
/* ins */ FILE_BOX},
/* sign */ {XML_SIGN,
/* short */ "XML box",
/* long */ "This box provides a tool by which vendors can add XML formatted information to a JP2 file",
/* sbox */ 0,
/* req */ {0, 0, 0},
/* ins */ FILE_BOX},
/* sign */ {UUID_SIGN,
/* short */ "UUID box",
/* long */ "This box provides a tool by which vendors can add additional information to a file "
"without risking conflict with other vendors",
/* sbox */ 0,
/* req */ {0, 0, 0},
/* ins */ FILE_BOX},
/* sign */ {UINF_SIGN,
/* short */ "UUID Info box",
/* long */ "This box provides a tool by which a vendor may provide access to additional information associated with a UUID",
/* sbox */ 0,
/* req */ {0, 0, 0},
/* ins */ FILE_BOX},
/* sign */ {MOOV_SIGN,
/* short */ "Movie box",
/* long */ "This box contains the media data. In video tracks, this box would contain JPEG2000 video frames",
/* sbox */ 1,
/* req */ {1, 1, 1},
/* ins */ FILE_BOX},
/* sign */ {MVHD_SIGN,
/* short */ "Movie Header box",
/* long */ "This box defines overall information which is media-independent, and relevant to the entire presentation "
"considered as a whole",
/* sbox */ 0,
/* req */ {1, 1, 1},
/* ins */ MOOV_BOX},
/* sign */ {TRAK_SIGN,
/* short */ "Track box",
/* long */ "This is a container box for a single track of a presentation. A presentation may consist of one or more tracks",
/* sbox */ 1,
/* req */ {1, 1, 1},
/* ins */ MOOV_BOX},
/* sign */ {TKHD_SIGN,
/* short */ "Track Header box",
/* long */ "This box specifies the characteristics of a single track. Exactly one Track Header Box is contained in a track",
/* sbox */ 0,
/* req */ {1, 1, 1},
/* ins */ TRAK_BOX},
/* sign */ {MDIA_SIGN,
/* short */ "Media box",
/* long */ "The media declaration container contains all the objects which declare information about the media data "
"within a track",
/* sbox */ 1,
/* req */ {1, 1, 1},
/* ins */ TRAK_BOX},
/* sign */ {MINF_SIGN,
/* short */ "Media Information box",
/* long */ "This box contains all the objects which declare characteristic information of the media in the track",
/* sbox */ 1,
/* req */ {1, 1, 1},
/* ins */ MDIA_BOX},
/* sign */ {STBL_SIGN,
/* short */ "Sample Table box",
/* long */ "The sample table contains all the time and data indexing of the media samples in a track",
/* sbox */ 1,
/* req */ {1, 1, 1},
/* ins */ MINF_BOX},
/* sign */ {STSD_SIGN,
/* short */ "Sample Description box",
/* long */ "The sample description table gives detailed information about the coding type used, and any initialization "
"information needed for that coding",
/* sbox */ 0,
/* req */ {1, 1, 1},
/* ins */ MINF_BOX},
/* sign */ {MJP2_SIGN,
/* short */ "MJP2 Sample Description box",
/* long */ "The MJP2 sample description table gives detailed information about the coding type used, and any initialization "
"information needed for that coding",
/* sbox */ 0,
/* req */ {1, 1, 1},
/* ins */ MINF_BOX},
/* sign */ {MDAT_SIGN,
/* short */ "Media Data box",
/* long */ "The meta-data for a presentation is stored in the single Movie Box which occurs at the top-level of a file",
/* sbox */ 1,
/* req */ {1, 1, 1},
/* ins */ FILE_BOX},
/* sign */ {ANY_SIGN,
/* short */ "Any box",
/* long */ "All the existing boxes",
/* sbox */ 0,
/* req */ {0, 0, 0},
/* ins */ FILE_BOX},
/* sign */ {UNK_SIGN,
/* short */ "Unknown Type box",
/* long */ "The signature is not recognised to be that of an existing box",
/* sbox */ 0,
/* req */ {0, 0, 0},
/* ins */ ANY_BOX}
};
/* declaration */
int
my_box_handler_function(my_j2boxtype boxtype, wxInputStream& stream, unsigned long int filepoint, unsigned long int filelimit, int level,
char *scansign, unsigned long int *scanpoint);
#ifdef __WXMSW__
typedef unsigned __int64 int8byte;
#endif // __WXMSW__
#ifdef __WXGTK__
typedef unsigned long long int8byte;
#endif // __WXGTK__
/* internal mini-search for a box signature */
int
my_jpeg2000parse(wxInputStream& stream, unsigned long int filepoint, unsigned long int filelimit, int level,
char *scansign, unsigned long int *scanpoint)
{
unsigned long int LBox = 0x00000000;
//int LBox_read;
char TBox[5] = "\0\0\0\0";
//int TBox_read;
int8byte XLBox = 0x0000000000000000;
//int XLBox_read;
unsigned long int box_length = 0;
int last_box = 0, box_num = 0;
int box_type = ANY_BOX;
unsigned char /*onebyte[1], twobytes[2],*/ fourbytes[4];
int box_number = 0;
/* cycle all over the file */
box_num = 0;
last_box = 0;
while (!last_box) {
/* do not exceed file limit */
if (filepoint >= filelimit)
return (0);
/* seek on file */
if (stream.SeekI(filepoint, wxFromStart) == wxInvalidOffset)
return (-1);
/* read the mandatory LBox, 4 bytes */
if (!stream.Read(fourbytes, 4)) {
(wxT("Problem reading LBox from the file (file ended?)"));
return -1;
};
LBox = STREAM_TO_UINT32(fourbytes, 0);
/* read the mandatory TBox, 4 bytes */
if (!stream.Read(TBox, 4)) {
wxLogError(wxT("Problem reading TBox from the file (file ended?)"));
return -1;
};
/* look if scansign is got */
if ((scansign != NULL) && (memcmp(TBox, scansign, 4) == 0)) {
/* hack/exploit */
// stop as soon as you find the level-th codebox
if (box_number == level) {
memcpy(scansign, " ", 4);
*scanpoint = filepoint;
return (0);
} else
box_number++;
};
/* determine the box type */
for (box_type = JP_BOX; box_type < UNK_BOX; box_type++)
if (memcmp(TBox, j2box[box_type].value, 4) == 0)
break;
/* read the optional XLBox, 8 bytes */
if (LBox == 1) {
if (!stream.Read(&XLBox, 8)) {
wxLogError(wxT("Problem reading XLBox from the file (file ended?)"));
return -1;
};
box_length = (unsigned long int) BYTE_SWAP8(XLBox);
} else if (LBox == 0x00000000) {
/* last box in file */
last_box = 1;
box_length = filelimit - filepoint;
} else
box_length = LBox;
/* go deep in the box */
my_box_handler_function((my_j2boxtype) box_type, stream, (LBox == 1) ? (filepoint + 16) : (filepoint + 8), filepoint + box_length, level,
scansign, scanpoint);
/* if it's a superbox go inside it */
if (j2box[box_type].sbox)
my_jpeg2000parse(stream, (LBox == 1) ? (filepoint + 16) : (filepoint + 8), filepoint + box_length,
level, scansign, scanpoint);
/* increment box number and filepoint*/
box_num++;
filepoint += box_length;
};
/* all good */
return (0);
}
// search first contiguos codestream box in an mj2 file
unsigned long int
searchjp2c(wxInputStream& stream, unsigned long int fsize, int number)
{
char scansign[] = "jp2c";
unsigned long int scanpoint = 0L;
wxLogMessage(wxT("MJ2: searching jp2c box... "));
/* do the parsing */
if (my_jpeg2000parse(stream, 0, fsize, number, scansign, &scanpoint) < 0)
wxLogMessage(wxT("MJ2: Unrecoverable error during file parsing: stopping"));
if (strcmp(scansign, " "))
wxLogMessage(wxT("MJ2: not found"));
else {
wxLogMessage(wxString::Format(wxT("MJ2: found at byte %d"), scanpoint));
};
return (scanpoint);
}
// search the jp2h box in the file
unsigned long int
searchjpegheaderbox(wxInputStream& stream, unsigned long int fsize)
{
char scansign[] = "jp2h";
unsigned long int scanpoint = 0L;
wxLogMessage(wxT("MJ2: searching jp2h box... "));
/* do the parsing */
if (my_jpeg2000parse(stream, 0, fsize, 0, scansign, &scanpoint) < 0)
wxLogMessage(wxT("Unrecoverable error during file parsing: stopping"));
if (strcmp(scansign, " "))
wxLogMessage(wxT("MJ2: not found"));
else
wxLogMessage(wxString::Format(wxT("MJ2: found at byte %d"), scanpoint));
return (scanpoint);
}
/* handling functions */
#define ITEM_PER_ROW 10
/* Box handler function */
int
my_box_handler_function(my_j2boxtype boxtype, wxInputStream& stream, unsigned long int filepoint, unsigned long int filelimit, int level,
char *scansign, unsigned long int *scanpoint)
{
switch (boxtype) {
/* Sample Description box */
case (STSD_BOX):
my_jpeg2000parse(stream, filepoint + 8, filelimit, level, scansign, scanpoint);
break;
/* MJP2 Sample Description box */
case (MJP2_BOX):
my_jpeg2000parse(stream, filepoint + 78, filelimit, level, scansign, scanpoint);
break;
/* not yet implemented */
default:
break;
};
return (0);
}
// the jP and ftyp parts of the header
#define my_jPheadSIZE 32
unsigned char my_jPhead[my_jPheadSIZE] = {
0x00, 0x00, 0x00, 0x0C, 'j', 'P', ' ', ' ',
0x0D, 0x0A, 0x87, 0x0A, 0x00, 0x00, 0x00, 0x14,
'f', 't', 'y', 'p', 'j', 'p', '2', ' ',
0x00, 0x00, 0x00, 0x00, 'j', 'p', '2', ' '
};
/////////////////////////////////////////////////
/////////////////////////////////////////////////
// load the mj2 file format
bool wxMJ2Handler::LoadFile(wxImage *image, wxInputStream& stream, bool verbose, int index)
{
opj_dparameters_t parameters; /* decompression parameters */
opj_event_mgr_t event_mgr; /* event manager */
opj_image_t *opjimage = NULL;
unsigned char *src = NULL;
unsigned char *ptr;
int file_length, jp2c_point, jp2h_point;
unsigned long int jp2hboxlen, jp2cboxlen;
opj_codestream_info_t cstr_info; /* Codestream information structure */
// destroy the image
image->Destroy();
/* handle to a decompressor */
opj_dinfo_t* dinfo = NULL;
opj_cio_t *cio = NULL;
/* configure the event callbacks (not required) */
memset(&event_mgr, 0, sizeof(opj_event_mgr_t));
event_mgr.error_handler = mj2_error_callback;
event_mgr.warning_handler = mj2_warning_callback;
event_mgr.info_handler = mj2_info_callback;
/* set decoding parameters to default values */
opj_set_default_decoder_parameters(&parameters);
/* prepare parameters */
strncpy(parameters.infile, "", sizeof(parameters.infile)-1);
strncpy(parameters.outfile, "", sizeof(parameters.outfile)-1);
parameters.decod_format = JP2_CFMT;
parameters.cod_format = BMP_DFMT;
if (m_reducefactor)
parameters.cp_reduce = m_reducefactor;
if (m_qualitylayers)
parameters.cp_layer = m_qualitylayers;
/*if (n_components)
parameters. = n_components;*/
/* JPWL only */
#ifdef USE_JPWL
parameters.jpwl_exp_comps = m_expcomps;
parameters.jpwl_max_tiles = m_maxtiles;
parameters.jpwl_correct = m_enablejpwl;
#endif /* USE_JPWL */
/* get a decoder handle */
dinfo = opj_create_decompress(CODEC_JP2);
/* find length of the stream */
stream.SeekI(0, wxFromEnd);
file_length = (int) stream.TellI();
/* search for the first codestream box and the movie header box */
jp2c_point = searchjp2c(stream, file_length, m_framenum);
jp2h_point = searchjpegheaderbox(stream, file_length);
// read the jp2h box and store it
stream.SeekI(jp2h_point, wxFromStart);
stream.Read(&jp2hboxlen, sizeof(unsigned long int));
jp2hboxlen = BYTE_SWAP4(jp2hboxlen);
// read the jp2c box and store it
stream.SeekI(jp2c_point, wxFromStart);
stream.Read(&jp2cboxlen, sizeof(unsigned long int));
jp2cboxlen = BYTE_SWAP4(jp2cboxlen);
// malloc memory source
src = (unsigned char *) malloc(my_jPheadSIZE + jp2hboxlen + jp2cboxlen);
// copy the jP and ftyp
memcpy(src, my_jPhead, my_jPheadSIZE);
// copy the jp2h
stream.SeekI(jp2h_point, wxFromStart);
stream.Read(&src[my_jPheadSIZE], jp2hboxlen);
// copy the jp2c
stream.SeekI(jp2c_point, wxFromStart);
stream.Read(&src[my_jPheadSIZE + jp2hboxlen], jp2cboxlen);
/* catch events using our callbacks and give a local context */
opj_set_event_mgr((opj_common_ptr)dinfo, &event_mgr, stderr);
/* setup the decoder decoding parameters using user parameters */
opj_setup_decoder(dinfo, &parameters);
/* open a byte stream */
cio = opj_cio_open((opj_common_ptr)dinfo, src, my_jPheadSIZE + jp2hboxlen + jp2cboxlen);
/* decode the stream and fill the image structure */
opjimage = opj_decode_with_info(dinfo, cio, &cstr_info);
if (!opjimage) {
wxMutexGuiEnter();
wxLogError(wxT("MJ2: failed to decode image!"));
wxMutexGuiLeave();
opj_destroy_decompress(dinfo);
opj_cio_close(cio);
free(src);
return false;
}
/* close the byte stream */
opj_cio_close(cio);
/* common rendering method */
#include "imagjpeg2000.cpp"
wxMutexGuiEnter();
wxLogMessage(wxT("MJ2: image loaded."));
wxMutexGuiLeave();
/* close openjpeg structs */
opj_destroy_decompress(dinfo);
opj_image_destroy(opjimage);
free(src);
if (!image->Ok())
return false;
else
return true;
}
// save the mj2 file format
bool wxMJ2Handler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose )
{
wxLogError(wxT("MJ2: Couldn't save movie -> not implemented."));
return false;
}
#ifdef __VISUALC__
#pragma warning(default:4611)
#endif /* VC++ */
// recognize the Motion JPEG 2000 starting box
bool wxMJ2Handler::DoCanRead( wxInputStream& stream )
{
unsigned char hdr[24];
if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
return false;
return (hdr[0] == 0x00 &&
hdr[1] == 0x00 &&
hdr[2] == 0x00 &&
hdr[3] == 0x0C &&
hdr[4] == 0x6A &&
hdr[5] == 0x50 &&
hdr[6] == 0x20 &&
hdr[7] == 0x20 &&
hdr[20] == 0x6D &&
hdr[21] == 0x6A &&
hdr[22] == 0x70 &&
hdr[23] == 0x32);
}
#endif // wxUSE_STREAMS
#endif // wxUSE_LIBOPENJPEG
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