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Code Issues Releases Activity

avcodec/jpeg2000dec: iterate in tile sample space for CPRL & RPCL

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Thats what the spec says should be done
aka iterate in the wrong space and use special cases to patch that up.
It sometimes can result in different order

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-06-26 13:44:17 +02:00
parent 29cc0a178e
commit 7ca0cd5831
1 changed files with 12 additions and 18 deletions
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30
libavcodec/jpeg2000dec.c
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@ -1012,9 +1012,6 @@ static int jpeg2000_decode_packets(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile
Jpeg2000Component *comp = tile->comp + compno;
Jpeg2000CodingStyle *codsty = tile->codsty + compno;
Jpeg2000QuantStyle *qntsty = tile->qntsty + compno;
int maxlogstep_x = 0;
int maxlogstep_y = 0;
int start_x, start_y;
step_x = 32;
step_y = 32;
@ -1023,30 +1020,28 @@ static int jpeg2000_decode_packets(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile
Jpeg2000ResLevel *rlevel = comp->reslevel + reslevelno;
step_x = FFMIN(step_x, rlevel->log2_prec_width + reducedresno);
step_y = FFMIN(step_y, rlevel->log2_prec_height + reducedresno);
maxlogstep_x = FFMAX(maxlogstep_x, rlevel->log2_prec_width + reducedresno);
maxlogstep_y = FFMAX(maxlogstep_y, rlevel->log2_prec_height + reducedresno);
}
step_x = 1<<step_x;
step_y = 1<<step_y;
start_y = comp->coord_o[1][0] >> maxlogstep_y << maxlogstep_y;
start_x = comp->coord_o[0][0] >> maxlogstep_x << maxlogstep_x;
for (y = start_y; y < comp->coord_o[1][1]; y += step_y) {
for (x = start_x; x < comp->coord_o[0][1]; x += step_x) {
for (y = tile->coord[1][0]; y < tile->coord[1][1]; y = (y/step_y + 1)*step_y) {
for (x = tile->coord[0][0]; x < tile->coord[0][1]; x = (x/step_x + 1)*step_x) {
for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++) {
unsigned prcx, prcy;
uint8_t reducedresno = codsty->nreslevels - 1 -reslevelno; // ==> N_L - r
Jpeg2000ResLevel *rlevel = comp->reslevel + reslevelno;
int xc = x / s->cdx[compno];
int yc = y / s->cdy[compno];
if (y % (1 << (rlevel->log2_prec_height + reducedresno)))
if (yc % (1 << (rlevel->log2_prec_height + reducedresno)) && y != tile->coord[1][0]) //FIXME this is a subset of the check
continue;
if (x % (1 << (rlevel->log2_prec_width + reducedresno)))
if (xc % (1 << (rlevel->log2_prec_width + reducedresno)) && x != tile->coord[0][0]) //FIXME this is a subset of the check
continue;
// check if a precinct exists
prcx = ff_jpeg2000_ceildivpow2(x, reducedresno) >> rlevel->log2_prec_width;
prcy = ff_jpeg2000_ceildivpow2(y, reducedresno) >> rlevel->log2_prec_height;
prcx = ff_jpeg2000_ceildivpow2(xc, reducedresno) >> rlevel->log2_prec_width;
prcy = ff_jpeg2000_ceildivpow2(yc, reducedresno) >> rlevel->log2_prec_height;
prcx -= ff_jpeg2000_ceildivpow2(comp->coord_o[0][0], reducedresno) >> rlevel->log2_prec_width;
prcy -= ff_jpeg2000_ceildivpow2(comp->coord_o[1][0], reducedresno) >> rlevel->log2_prec_height;
@ -1092,9 +1087,8 @@ static int jpeg2000_decode_packets(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile
step_x = 1<<step_x;
step_y = 1<<step_y;
//FIXME we could iterate over less than the whole image
for (y = 0; y < s->height; y += step_y) {
for (x = 0; x < s->width; x += step_x) {
for (y = tile->coord[1][0]; y < tile->coord[1][1]; y = (y/step_y + 1)*step_y) {
for (x = tile->coord[0][0]; x < tile->coord[0][1]; x = (x/step_x + 1)*step_x) {
for (compno = 0; compno < s->ncomponents; compno++) {
Jpeg2000Component *comp = tile->comp + compno;
Jpeg2000CodingStyle *codsty = tile->codsty + compno;
@ -1109,10 +1103,10 @@ static int jpeg2000_decode_packets(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile
if (reslevelno >= codsty->nreslevels)
continue;
if (yc % (1 << (rlevel->log2_prec_height + reducedresno)))
if (yc % (1 << (rlevel->log2_prec_height + reducedresno)) && y != tile->coord[1][0]) //FIXME this is a subset of the check
continue;
if (xc % (1 << (rlevel->log2_prec_width + reducedresno)))
if (xc % (1 << (rlevel->log2_prec_width + reducedresno)) && x != tile->coord[0][0]) //FIXME this is a subset of the check
continue;
// check if a precinct exists