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jpeg2000: Compute corrections of sub-band coordinates

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Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Michael Niedermayer 2013-07-01 10:01:24 +02:00 committed by Luca Barbato
parent 690c8af97b
commit db13e02c6f
1 changed files with 7 additions and 3 deletions
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10
libavcodec/jpeg2000.c
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@ -335,9 +335,8 @@ int ff_jpeg2000_init_component(Jpeg2000Component *comp,
for (i = 0; i < 2; i++)
for (j = 0; j < 2; j++)
band->coord[i][j] =
ff_jpeg2000_ceildivpow2(comp->coord_o[i][j],
ff_jpeg2000_ceildivpow2(comp->coord_o[i][j] - comp->coord_o[i][0],
declvl - 1);
log2_band_prec_width = reslevel->log2_prec_width;
log2_band_prec_height = reslevel->log2_prec_height;
/* see ISO/IEC 15444-1:2002 eq. B-17 and eq. B-15 */
@ -352,7 +351,7 @@ int ff_jpeg2000_init_component(Jpeg2000Component *comp,
for (j = 0; j < 2; j++)
/* Formula example for tbx_0 = ceildiv((tcx_0 - 2 ^ (declvl - 1) * x0_b) / declvl) */
band->coord[i][j] =
ff_jpeg2000_ceildivpow2(comp->coord_o[i][j] -
ff_jpeg2000_ceildivpow2(comp->coord_o[i][j] - comp->coord_o[i][0] -
(((bandno + 1 >> i) & 1) << declvl - 1),
declvl);
/* TODO: Manage case of 3 band offsets here or
@ -368,6 +367,11 @@ int ff_jpeg2000_init_component(Jpeg2000Component *comp,
log2_band_prec_height = reslevel->log2_prec_height - 1;
}
for (j = 0; j < 2; j++)
band->coord[0][j] = ff_jpeg2000_ceildiv(band->coord[0][j], dx);
for (j = 0; j < 2; j++)
band->coord[1][j] = ff_jpeg2000_ceildiv(band->coord[1][j], dy);
band->prec = av_malloc_array(reslevel->num_precincts_x *
reslevel->num_precincts_y,
sizeof(*band->prec));