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ffmpeg.wasm-core
Commit d9841e53 authored by Michael Niedermayer's avatar Michael Niedermayer
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avcodec/jpeg2000: Change precinct coords to same origin as bands 

Signed-off-by: 's avatarMichael Niedermayer <michaelni@gmx.at>
parent 59c10729
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Showing with 12 additions and 12 deletions
libavcodec/jpeg2000.c
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......@@ -382,24 +382,24 @@ int ff_jpeg2000_init_component(Jpeg2000Component *comp,
/* TODO: Verify with previous count of codeblocks per band */
/* Compute P_x0 */
prec->coord[0][0] = (precno % reslevel->num_precincts_x) *
prec->coord[0][0] = ((band->coord[0][0] >> reslevel->log2_prec_width) + precno % reslevel->num_precincts_x) *
(1 << log2_band_prec_width);
prec->coord[0][0] = FFMAX(prec->coord[0][0], band->coord[0][0] - band->coord[0][0]);
prec->coord[0][0] = FFMAX(prec->coord[0][0], band->coord[0][0]);
/* Compute P_y0 */
prec->coord[1][0] = (precno / reslevel->num_precincts_x) *
prec->coord[1][0] = ((band->coord[1][0] >> reslevel->log2_prec_height) + precno / reslevel->num_precincts_x) *
(1 << log2_band_prec_height);
prec->coord[1][0] = FFMAX(prec->coord[1][0], band->coord[1][0] - band->coord[1][0]);
prec->coord[1][0] = FFMAX(prec->coord[1][0], band->coord[1][0]);
/* Compute P_x1 */
prec->coord[0][1] = prec->coord[0][0] +
(1 << log2_band_prec_width);
prec->coord[0][1] = FFMIN(prec->coord[0][1], band->coord[0][1] - band->coord[0][0]);
prec->coord[0][1] = FFMIN(prec->coord[0][1], band->coord[0][1]);
/* Compute P_y1 */
prec->coord[1][1] = prec->coord[1][0] +
(1 << log2_band_prec_height);
prec->coord[1][1] = FFMIN(prec->coord[1][1], band->coord[1][1] - band->coord[1][0]);
prec->coord[1][1] = FFMIN(prec->coord[1][1], band->coord[1][1]);
prec->nb_codeblocks_width =
ff_jpeg2000_ceildivpow2(prec->coord[0][1] -
......@@ -437,22 +437,22 @@ int ff_jpeg2000_init_component(Jpeg2000Component *comp,
/* Compute coordinates of codeblocks */
/* Compute Cx0*/
Cx0 = (prec->coord[0][0] >> band->log2_cblk_width) << band->log2_cblk_width;
Cx0 = ((prec->coord[0][0] - band->coord[0][0]) >> band->log2_cblk_width) << band->log2_cblk_width;
Cx0 = Cx0 + ((cblkno % prec->nb_codeblocks_width) << band->log2_cblk_width);
cblk->coord[0][0] = FFMAX(Cx0, prec->coord[0][0]);
cblk->coord[0][0] = FFMAX(Cx0, prec->coord[0][0] - band->coord[0][0]);
/* Compute Cy0*/
Cy0 = (prec->coord[1][0] >> band->log2_cblk_height) << band->log2_cblk_height;
Cy0 = ((prec->coord[1][0] - band->coord[1][0]) >> band->log2_cblk_height) << band->log2_cblk_height;
Cy0 = Cy0 + ((cblkno / prec->nb_codeblocks_width) << band->log2_cblk_height);
cblk->coord[1][0] = FFMAX(Cy0, prec->coord[1][0]);
cblk->coord[1][0] = FFMAX(Cy0, prec->coord[1][0] - band->coord[1][0]);
/* Compute Cx1 */
cblk->coord[0][1] = FFMIN(Cx0 + (1 << band->log2_cblk_width),
prec->coord[0][1]);
prec->coord[0][1] - band->coord[0][0]);
/* Compute Cy1 */
cblk->coord[1][1] = FFMIN(Cy0 + (1 << band->log2_cblk_height),
prec->coord[1][1]);
prec->coord[1][1] - band->coord[1][0]);
/* Update code-blocks coordinates according sub-band position */
if ((bandno + !!reslevelno) & 1) {
cblk->coord[0][0] += comp->reslevel[reslevelno-1].coord[0][1] -
......
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