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jp2.c

/*
 * Copyright (c) 2004, Yannick Verschueren
 * Copyright (c) 2005, Hervé Drolon, FreeImage Team
 * Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
 * 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.
 */

#include "opj_includes.h"

/** @defgroup JP2 JP2 - JPEG-2000 file format reader/writer */
/*@{*/

/** @name Local static functions */
/*@{*/

/**
Read box headers
@param cinfo Codec context info
@param cio Input stream
@param box
@return Returns true if successful, returns false otherwise
*/
static bool jp2_read_boxhdr(opj_common_ptr cinfo, opj_cio_t *cio, opj_jp2_box_t *box);
/*static void jp2_write_url(opj_cio_t *cio, char *Idx_file);*/
/**
Read the IHDR box - Image Header box
@param jp2 JP2 handle
@param cio Input buffer stream
@return Returns true if successful, returns false otherwise
*/
static bool jp2_read_ihdr(opj_jp2_t *jp2, opj_cio_t *cio);
static void jp2_write_ihdr(opj_jp2_t *jp2, opj_cio_t *cio);
static void jp2_write_bpcc(opj_jp2_t *jp2, opj_cio_t *cio);
static bool jp2_read_bpcc(opj_jp2_t *jp2, opj_cio_t *cio);
static void jp2_write_colr(opj_jp2_t *jp2, opj_cio_t *cio);
static bool jp2_read_colr(opj_jp2_t *jp2, opj_cio_t *cio);
/**
Write the JP2H box - JP2 Header box
@param jp2 JP2 handle
@param cio Output buffer stream
*/
static void jp2_write_jp2h(opj_jp2_t *jp2, opj_cio_t *cio);
/**
Read the JP2H box - JP2 Header box
@param jp2 JP2 handle
@param cio Input buffer stream
@return Returns true if successful, returns false otherwise
*/
static bool jp2_read_jp2h(opj_jp2_t *jp2, opj_cio_t *cio);
/**
Write the FTYP box - File type box
@param jp2 JP2 handle
@param cio Output buffer stream
*/
static void jp2_write_ftyp(opj_jp2_t *jp2, opj_cio_t *cio);
/**
Read the FTYP box - File type box
@param jp2 JP2 handle
@param cio Input buffer stream
@return Returns true if successful, returns false otherwise
*/
static bool jp2_read_ftyp(opj_jp2_t *jp2, opj_cio_t *cio);
static int jp2_write_jp2c(opj_jp2_t *jp2, opj_cio_t *cio, opj_image_t *image, char *index);
static bool jp2_read_jp2c(opj_jp2_t *jp2, opj_cio_t *cio, unsigned int *j2k_codestream_length, unsigned int *j2k_codestream_offset);
static void jp2_write_jp(opj_cio_t *cio);
/**
Read the JP box - JPEG 2000 signature
@param jp2 JP2 handle
@param cio Input buffer stream
@return Returns true if successful, returns false otherwise
*/
static bool jp2_read_jp(opj_jp2_t *jp2, opj_cio_t *cio);
/**
Decode the structure of a JP2 file
@param jp2 JP2 handle
@param cio Input buffer stream
@return Returns true if successful, returns false otherwise
*/
static bool jp2_read_struct(opj_jp2_t *jp2, opj_cio_t *cio);

/*@}*/

/*@}*/

/* ----------------------------------------------------------------------- */

00108 static bool jp2_read_boxhdr(opj_common_ptr cinfo, opj_cio_t *cio, opj_jp2_box_t *box) {
      box->init_pos = cio_tell(cio);
      box->length = cio_read(cio, 4);
      box->type = cio_read(cio, 4);
      if (box->length == 1) {
            if (cio_read(cio, 4) != 0) {
                  opj_event_msg(cinfo, EVT_ERROR, "Cannot handle box sizes higher than 2^32\n");
                  return false;
            }
            box->length = cio_read(cio, 4);
            if (box->length == 0) 
                  box->length = cio_numbytesleft(cio) + 12;
      }
      else if (box->length == 0) {
            box->length = cio_numbytesleft(cio) + 8;
      }
      
      return true;
}

#if 0
static void jp2_write_url(opj_cio_t *cio, char *Idx_file) {
      unsigned int i;
      opj_jp2_box_t box;

      box.init_pos = cio_tell(cio);
      cio_skip(cio, 4);
      cio_write(cio, JP2_URL, 4);   /* DBTL */
      cio_write(cio, 0, 1);         /* VERS */
      cio_write(cio, 0, 3);         /* FLAG */

      if(Idx_file) {
            for (i = 0; i < strlen(Idx_file); i++) {
                  cio_write(cio, Idx_file[i], 1);
            }
      }

      box.length = cio_tell(cio) - box.init_pos;
      cio_seek(cio, box.init_pos);
      cio_write(cio, box.length, 4);      /* L */
      cio_seek(cio, box.init_pos + box.length);
}
#endif

00152 static bool jp2_read_ihdr(opj_jp2_t *jp2, opj_cio_t *cio) {
      opj_jp2_box_t box;

      opj_common_ptr cinfo = jp2->cinfo;

      jp2_read_boxhdr(cinfo, cio, &box);
      if (JP2_IHDR != box.type) {
            opj_event_msg(cinfo, EVT_ERROR, "Expected IHDR Marker\n");
            return false;
      }

      jp2->h = cio_read(cio, 4);                /* HEIGHT */
      jp2->w = cio_read(cio, 4);                /* WIDTH */
      jp2->numcomps = cio_read(cio, 2);   /* NC */
      jp2->comps = (opj_jp2_comps_t*) opj_malloc(jp2->numcomps * sizeof(opj_jp2_comps_t));

      jp2->bpc = cio_read(cio, 1);        /* BPC */

      jp2->C = cio_read(cio, 1);                /* C */
      jp2->UnkC = cio_read(cio, 1);       /* UnkC */
      jp2->IPR = cio_read(cio, 1);        /* IPR */

      if (cio_tell(cio) - box.init_pos != box.length) {
            opj_event_msg(cinfo, EVT_ERROR, "Error with IHDR Box\n");
            return false;
      }

      return true;
}

static void jp2_write_ihdr(opj_jp2_t *jp2, opj_cio_t *cio) {
      opj_jp2_box_t box;

      box.init_pos = cio_tell(cio);
      cio_skip(cio, 4);
      cio_write(cio, JP2_IHDR, 4);        /* IHDR */

      cio_write(cio, jp2->h, 4);                /* HEIGHT */
      cio_write(cio, jp2->w, 4);                /* WIDTH */
      cio_write(cio, jp2->numcomps, 2);   /* NC */

      cio_write(cio, jp2->bpc, 1);        /* BPC */

      cio_write(cio, jp2->C, 1);                /* C : Always 7 */
      cio_write(cio, jp2->UnkC, 1);       /* UnkC, colorspace unknown */
      cio_write(cio, jp2->IPR, 1);        /* IPR, no intellectual property */

      box.length = cio_tell(cio) - box.init_pos;
      cio_seek(cio, box.init_pos);
      cio_write(cio, box.length, 4);      /* L */
      cio_seek(cio, box.init_pos + box.length);
}

static void jp2_write_bpcc(opj_jp2_t *jp2, opj_cio_t *cio) {
      unsigned int i;
      opj_jp2_box_t box;

      box.init_pos = cio_tell(cio);
      cio_skip(cio, 4);
      cio_write(cio, JP2_BPCC, 4);  /* BPCC */

      for (i = 0; i < jp2->numcomps; i++) {
            cio_write(cio, jp2->comps[i].bpcc, 1);
      }

      box.length = cio_tell(cio) - box.init_pos;
      cio_seek(cio, box.init_pos);
      cio_write(cio, box.length, 4);      /* L */
      cio_seek(cio, box.init_pos + box.length);
}


static bool jp2_read_bpcc(opj_jp2_t *jp2, opj_cio_t *cio) {
      unsigned int i;
      opj_jp2_box_t box;

      opj_common_ptr cinfo = jp2->cinfo;

      jp2_read_boxhdr(cinfo, cio, &box);
      if (JP2_BPCC != box.type) {
            opj_event_msg(cinfo, EVT_ERROR, "Expected BPCC Marker\n");
            return false;
      }

      for (i = 0; i < jp2->numcomps; i++) {
            jp2->comps[i].bpcc = cio_read(cio, 1);
      }

      if (cio_tell(cio) - box.init_pos != box.length) {
            opj_event_msg(cinfo, EVT_ERROR, "Error with BPCC Box\n");
            return false;
      }

      return true;
}

static void jp2_write_colr(opj_jp2_t *jp2, opj_cio_t *cio) {
      opj_jp2_box_t box;

      box.init_pos = cio_tell(cio);
      cio_skip(cio, 4);
      cio_write(cio, JP2_COLR, 4);        /* COLR */

      cio_write(cio, jp2->meth, 1);       /* METH */
      cio_write(cio, jp2->precedence, 1); /* PRECEDENCE */
      cio_write(cio, jp2->approx, 1);           /* APPROX */

      if (jp2->meth == 1) {
            cio_write(cio, jp2->enumcs, 4);     /* EnumCS */
      } else {
            cio_write(cio, 0, 1);               /* PROFILE (??) */
      }

      box.length = cio_tell(cio) - box.init_pos;
      cio_seek(cio, box.init_pos);
      cio_write(cio, box.length, 4);      /* L */
      cio_seek(cio, box.init_pos + box.length);
}

static bool jp2_read_colr(opj_jp2_t *jp2, opj_cio_t *cio) {
      opj_jp2_box_t box;
      int skip_len;

      opj_common_ptr cinfo = jp2->cinfo;

      jp2_read_boxhdr(cinfo, cio, &box);
      do {
            if (JP2_COLR != box.type) {
                  cio_skip(cio, box.length - 8);
                  jp2_read_boxhdr(cinfo, cio, &box);
            }
      } while(JP2_COLR != box.type);

      jp2->meth = cio_read(cio, 1);       /* METH */
      jp2->precedence = cio_read(cio, 1); /* PRECEDENCE */
      jp2->approx = cio_read(cio, 1);           /* APPROX */

      if (jp2->meth == 1) {
            jp2->enumcs = cio_read(cio, 4);     /* EnumCS */
      } else {
            /* skip PROFILE */
            skip_len = box.init_pos + box.length - cio_tell(cio);
            if (skip_len < 0) {
                  opj_event_msg(cinfo, EVT_ERROR, "Error with JP2H box size\n");
                  return false;
            }
            cio_skip(cio, box.init_pos + box.length - cio_tell(cio));
      }

      if (cio_tell(cio) - box.init_pos != box.length) {
            opj_event_msg(cinfo, EVT_ERROR, "Error with BPCC Box\n");
            return false;
      }
      return true;
}

00308 static void jp2_write_jp2h(opj_jp2_t *jp2, opj_cio_t *cio) {
      opj_jp2_box_t box;

      box.init_pos = cio_tell(cio);
      cio_skip(cio, 4);
      cio_write(cio, JP2_JP2H, 4);  /* JP2H */

      jp2_write_ihdr(jp2, cio);

      if (jp2->bpc == 255) {
            jp2_write_bpcc(jp2, cio);
      }
      jp2_write_colr(jp2, cio);

      box.length = cio_tell(cio) - box.init_pos;
      cio_seek(cio, box.init_pos);
      cio_write(cio, box.length, 4);      /* L */
      cio_seek(cio, box.init_pos + box.length);
}

00328 static bool jp2_read_jp2h(opj_jp2_t *jp2, opj_cio_t *cio) {
      opj_jp2_box_t box;
      int skip_len;

      opj_common_ptr cinfo = jp2->cinfo;

      jp2_read_boxhdr(cinfo, cio, &box);
      do {
            if (JP2_JP2H != box.type) {
                  if (box.type == JP2_JP2C) {
                        opj_event_msg(cinfo, EVT_ERROR, "Expected JP2H Marker\n");
                        return false;
                  }
                  cio_skip(cio, box.length - 8);
                  jp2_read_boxhdr(cinfo, cio, &box);
            }
      } while(JP2_JP2H != box.type);

      if (!jp2_read_ihdr(jp2, cio))
            return false;

      if (jp2->bpc == 255) {
            if (!jp2_read_bpcc(jp2, cio))
                  return false;
      }
      if (!jp2_read_colr(jp2, cio))
            return false;

      skip_len = box.init_pos + box.length - cio_tell(cio);
      if (skip_len < 0) {
            opj_event_msg(cinfo, EVT_ERROR, "Error with JP2H Box\n");
            return false;
      }
      cio_skip(cio, box.init_pos + box.length - cio_tell(cio));

      return true;
}

00366 static void jp2_write_ftyp(opj_jp2_t *jp2, opj_cio_t *cio) {
      unsigned int i;
      opj_jp2_box_t box;

      box.init_pos = cio_tell(cio);
      cio_skip(cio, 4);
      cio_write(cio, JP2_FTYP, 4);        /* FTYP */

      cio_write(cio, jp2->brand, 4);            /* BR */
      cio_write(cio, jp2->minversion, 4); /* MinV */

      for (i = 0; i < jp2->numcl; i++) {
            cio_write(cio, jp2->cl[i], 4);      /* CL */
      }

      box.length = cio_tell(cio) - box.init_pos;
      cio_seek(cio, box.init_pos);
      cio_write(cio, box.length, 4);      /* L */
      cio_seek(cio, box.init_pos + box.length);
}

00387 static bool jp2_read_ftyp(opj_jp2_t *jp2, opj_cio_t *cio) {
      int i;
      opj_jp2_box_t box;

      opj_common_ptr cinfo = jp2->cinfo;

      jp2_read_boxhdr(cinfo, cio, &box);

      if (JP2_FTYP != box.type) {
            opj_event_msg(cinfo, EVT_ERROR, "Expected FTYP Marker\n");
            return false;
      }

      jp2->brand = cio_read(cio, 4);            /* BR */
      jp2->minversion = cio_read(cio, 4); /* MinV */
      jp2->numcl = (box.length - 16) / 4;
      jp2->cl = (unsigned int *) opj_malloc(jp2->numcl * sizeof(unsigned int));

      for (i = 0; i < (int)jp2->numcl; i++) {
            jp2->cl[i] = cio_read(cio, 4);      /* CLi */
      }

      if (cio_tell(cio) - box.init_pos != box.length) {
            opj_event_msg(cinfo, EVT_ERROR, "Error with FTYP Box\n");
            return false;
      }

      return true;
}

static int jp2_write_jp2c(opj_jp2_t *jp2, opj_cio_t *cio, opj_image_t *image, char *index) {
      unsigned int j2k_codestream_offset, j2k_codestream_length;
      opj_jp2_box_t box;

      opj_j2k_t *j2k = jp2->j2k;

      box.init_pos = cio_tell(cio);
      cio_skip(cio, 4);
      cio_write(cio, JP2_JP2C, 4);  /* JP2C */

      /* J2K encoding */
      j2k_codestream_offset = cio_tell(cio);
      if(!j2k_encode(j2k, cio, image, index)) {
            opj_event_msg(j2k->cinfo, EVT_ERROR, "Failed to encode image\n");
            return 0;
      }
      j2k_codestream_length = cio_tell(cio) - j2k_codestream_offset;

      jp2->j2k_codestream_offset = j2k_codestream_offset;
      jp2->j2k_codestream_length = j2k_codestream_length;

      box.length = 8 + jp2->j2k_codestream_length;
      cio_seek(cio, box.init_pos);
      cio_write(cio, box.length, 4);      /* L */
      cio_seek(cio, box.init_pos + box.length);

      return box.length;
}

static bool jp2_read_jp2c(opj_jp2_t *jp2, opj_cio_t *cio, unsigned int *j2k_codestream_length, unsigned int *j2k_codestream_offset) {
      opj_jp2_box_t box;

      opj_common_ptr cinfo = jp2->cinfo;

      jp2_read_boxhdr(cinfo, cio, &box);
      do {
            if(JP2_JP2C != box.type) {
                  cio_skip(cio, box.length - 8);
                  jp2_read_boxhdr(cinfo, cio, &box);
            }
      } while(JP2_JP2C != box.type);

      *j2k_codestream_offset = cio_tell(cio);
      *j2k_codestream_length = box.length - 8;

      return true;
}

static void jp2_write_jp(opj_cio_t *cio) {
      opj_jp2_box_t box;

      box.init_pos = cio_tell(cio);
      cio_skip(cio, 4);
      cio_write(cio, JP2_JP, 4);          /* JP2 signature */
      cio_write(cio, 0x0d0a870a, 4);

      box.length = cio_tell(cio) - box.init_pos;
      cio_seek(cio, box.init_pos);
      cio_write(cio, box.length, 4);      /* L */
      cio_seek(cio, box.init_pos + box.length);
}

00479 static bool jp2_read_jp(opj_jp2_t *jp2, opj_cio_t *cio) {
      opj_jp2_box_t box;

      opj_common_ptr cinfo = jp2->cinfo;

      jp2_read_boxhdr(cinfo, cio, &box);
      if (JP2_JP != box.type) {
            opj_event_msg(cinfo, EVT_ERROR, "Expected JP Marker\n");
            return false;
      }
      if (0x0d0a870a != cio_read(cio, 4)) {
            opj_event_msg(cinfo, EVT_ERROR, "Error with JP Marker\n");
            return false;
      }
      if (cio_tell(cio) - box.init_pos != box.length) {
            opj_event_msg(cinfo, EVT_ERROR, "Error with JP Box size\n");
            return false;
      }

      return true;
}


00502 static bool jp2_read_struct(opj_jp2_t *jp2, opj_cio_t *cio) {
      if (!jp2_read_jp(jp2, cio))
            return false;
      if (!jp2_read_ftyp(jp2, cio))
            return false;
      if (!jp2_read_jp2h(jp2, cio))
            return false;
      if (!jp2_read_jp2c(jp2, cio, &jp2->j2k_codestream_length, &jp2->j2k_codestream_offset))
            return false;
      
      return true;
}

/* ----------------------------------------------------------------------- */
/* JP2 decoder interface                                             */
/* ----------------------------------------------------------------------- */

00519 opj_jp2_t* jp2_create_decompress(opj_common_ptr cinfo) {
      opj_jp2_t *jp2 = (opj_jp2_t*)opj_malloc(sizeof(opj_jp2_t));
      if(jp2) {
            jp2->cinfo = cinfo;
            /* create the J2K codec */
            jp2->j2k = j2k_create_decompress(cinfo);
            if(jp2->j2k == NULL) {
                  jp2_destroy_decompress(jp2);
                  return NULL;
            }
      }
      return jp2;
}

00533 void jp2_destroy_decompress(opj_jp2_t *jp2) {
      if(jp2) {
            /* destroy the J2K codec */
            j2k_destroy_decompress(jp2->j2k);

            if(jp2->comps) {
                  opj_free(jp2->comps);
            }
            if(jp2->cl) {
                  opj_free(jp2->cl);
            }
            opj_free(jp2);
      }
}

00548 void jp2_setup_decoder(opj_jp2_t *jp2, opj_dparameters_t *parameters) {
      /* setup the J2K codec */
      j2k_setup_decoder(jp2->j2k, parameters);
      /* further JP2 initializations go here */
}

00554 opj_image_t* jp2_decode(opj_jp2_t *jp2, opj_cio_t *cio) {
      opj_common_ptr cinfo;
      opj_image_t *image = NULL;

      if(!jp2 || !cio) {
            return NULL;
      }

      cinfo = jp2->cinfo;

      /* JP2 decoding */
      if(!jp2_read_struct(jp2, cio)) {
            opj_event_msg(cinfo, EVT_ERROR, "Failed to decode jp2 structure\n");
            return NULL;
      }

      /* J2K decoding */
      image = j2k_decode(jp2->j2k, cio);
      if(!image) {
            opj_event_msg(cinfo, EVT_ERROR, "Failed to decode J2K image\n");
      }

      return image;
}

/* ----------------------------------------------------------------------- */
/* JP2 encoder interface                                             */
/* ----------------------------------------------------------------------- */

00583 opj_jp2_t* jp2_create_compress(opj_common_ptr cinfo) {
      opj_jp2_t *jp2 = (opj_jp2_t*)opj_malloc(sizeof(opj_jp2_t));
      if(jp2) {
            jp2->cinfo = cinfo;
            /* create the J2K codec */
            jp2->j2k = j2k_create_compress(cinfo);
            if(jp2->j2k == NULL) {
                  jp2_destroy_compress(jp2);
                  return NULL;
            }
      }
      return jp2;
}

00597 void jp2_destroy_compress(opj_jp2_t *jp2) {
      if(jp2) {
            /* destroy the J2K codec */
            j2k_destroy_compress(jp2->j2k);

            if(jp2->comps) {
                  opj_free(jp2->comps);
            }
            if(jp2->cl) {
                  opj_free(jp2->cl);
            }
            opj_free(jp2);
      }
}

00612 void jp2_setup_encoder(opj_jp2_t *jp2, opj_cparameters_t *parameters, opj_image_t *image) {
      int i;
      int depth_0, sign;

      if(!jp2 || !parameters || !image)
            return;

      /* setup the J2K codec */
      /* ------------------- */

      j2k_setup_encoder(jp2->j2k, parameters, image);

      /* setup the JP2 codec */
      /* ------------------- */
      
      /* Profile box */

      jp2->brand = JP2_JP2;   /* BR */
      jp2->minversion = 0;    /* MinV */
      jp2->numcl = 1;
      jp2->cl = (unsigned int*) opj_malloc(jp2->numcl * sizeof(unsigned int));
      jp2->cl[0] = JP2_JP2;   /* CL0 : JP2 */

      /* Image Header box */

      jp2->numcomps = image->numcomps;    /* NC */
      jp2->comps = (opj_jp2_comps_t*) opj_malloc(jp2->numcomps * sizeof(opj_jp2_comps_t));
      jp2->h = image->y1 - image->y0;           /* HEIGHT */
      jp2->w = image->x1 - image->x0;           /* WIDTH */
      /* BPC */
      depth_0 = image->comps[0].prec - 1;
      sign = image->comps[0].sgnd;
      jp2->bpc = depth_0 + (sign << 7);
      for (i = 1; i < image->numcomps; i++) {
            int depth = image->comps[i].prec - 1;
            sign = image->comps[i].sgnd;
            if (depth_0 != depth)
                  jp2->bpc = 255;
      }
      jp2->C = 7;             /* C : Always 7 */
      jp2->UnkC = 0;          /* UnkC, colorspace specified in colr box */
      jp2->IPR = 0;           /* IPR, no intellectual property */
      
      /* BitsPerComponent box */

      for (i = 0; i < image->numcomps; i++) {
            jp2->comps[i].bpcc = image->comps[i].prec - 1 + (image->comps[i].sgnd << 7);
      }

      /* Colour Specification box */

      if ((image->numcomps == 1 || image->numcomps == 3) && (jp2->bpc != 255)) {
            jp2->meth = 1;    /* METH: Enumerated colourspace */
      } else {
            jp2->meth = 2;    /* METH: Restricted ICC profile */
      }
      if (jp2->meth == 1) {
            if (image->color_space == 1)
                  jp2->enumcs = 16; /* sRGB as defined by IEC 61966–2–1 */
            else if (image->color_space == 2)
                  jp2->enumcs = 17; /* greyscale */
            else if (image->color_space == 3)
                  jp2->enumcs = 18; /* YUV */
      } else {
            jp2->enumcs = 0;        /* PROFILE (??) */
      }
      jp2->precedence = 0;    /* PRECEDENCE */
      jp2->approx = 0;        /* APPROX */

}

00683 bool jp2_encode(opj_jp2_t *jp2, opj_cio_t *cio, opj_image_t *image, char *index) {

      /* JP2 encoding */

      /* JPEG 2000 Signature box */
      jp2_write_jp(cio);
      /* File Type box */
      jp2_write_ftyp(jp2, cio);
      /* JP2 Header box */
      jp2_write_jp2h(jp2, cio);

      /* J2K encoding */

      if(!jp2_write_jp2c(jp2, cio, image, index)) {
            opj_event_msg(jp2->cinfo, EVT_ERROR, "Failed to encode image\n");
            return false;
      }

      return true;
}



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