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Add documentation for magic values in the code

This commit is contained in:
Even Rouault 2017-07-06 13:23:29 +02:00
parent 434ace4ff7
commit 373520db30
2 changed files with 7 additions and 1 deletions
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4
src/lib/openjp2/t2.c
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@ -1491,6 +1491,10 @@ static OPJ_BOOL opj_t2_init_seg(opj_tcd_cblk_dec_t* cblk,
((seg - 1)->maxpasses == 10)) ? 2 : 1; ((seg - 1)->maxpasses == 10)) ? 2 : 1;
} }
} else { } else {
/* See paragraph "B.10.6 Number of coding passes" of the standard.
* Probably that 109 must be interpreted a (Mb-1)*3 + 1 with Mb=37,
* Mb being the maximum number of bit-planes available for the
* representation of coefficients in the sub-band */
seg->maxpasses = 109; seg->maxpasses = 109;
} }

4
src/lib/openjp2/tcd.c
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@ -965,8 +965,10 @@ static INLINE OPJ_BOOL opj_tcd_init_tile(opj_tcd_t *p_tcd, OPJ_UINT32 p_tile_no,
numbps = (OPJ_INT32)(l_image_comp->prec + l_gain); numbps = (OPJ_INT32)(l_image_comp->prec + l_gain);
l_band->stepsize = (OPJ_FLOAT32)(((1.0 + l_step_size->mant / 2048.0) * pow(2.0, l_band->stepsize = (OPJ_FLOAT32)(((1.0 + l_step_size->mant / 2048.0) * pow(2.0,
(OPJ_INT32)(numbps - l_step_size->expn)))) * fraction; (OPJ_INT32)(numbps - l_step_size->expn)))) * fraction;
/* Mb value of Equation E-2 in "E.1 Inverse quantization
* procedure" of the standard */
l_band->numbps = l_step_size->expn + (OPJ_INT32)l_tccp->numgbits - l_band->numbps = l_step_size->expn + (OPJ_INT32)l_tccp->numgbits -
1; /* WHY -1 ? */ 1;
if (!l_band->precincts && (l_nb_precincts > 0U)) { if (!l_band->precincts && (l_nb_precincts > 0U)) {
l_band->precincts = (opj_tcd_precinct_t *) opj_malloc(/*3 * */ l_band->precincts = (opj_tcd_precinct_t *) opj_malloc(/*3 * */