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avcodec/jpeg2000dec: Fix x/y step TODO for CPRL

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-06-13 12:19:22 +02:00
parent 3323c5f353
commit 86efe83177
1 changed files with 13 additions and 8 deletions
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21
libavcodec/jpeg2000dec.c
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@ -963,15 +963,20 @@ static int jpeg2000_decode_packets(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile
for (compno = 0; compno < s->ncomponents; compno++) {
Jpeg2000CodingStyle *codsty = tile->codsty + compno;
Jpeg2000QuantStyle *qntsty = tile->qntsty + compno;
int step_x = 32;
int step_y = 32;
/* Position loop (y axis)
* TODO: Automate computing of step 256.
* Fixed here, but to be computed before entering here. */
for (y = 0; y < s->height; y += 256) {
/* Position loop (y axis)
* TODO: automate computing of step 256.
* Fixed here, but to be computed before entering here. */
for (x = 0; x < s->width; x += 256) {
for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++) {
uint8_t reducedresno = codsty->nreslevels - 1 -reslevelno; // ==> N_L - r
Jpeg2000ResLevel *rlevel = tile->comp[compno].reslevel + reslevelno;
step_x = FFMIN(step_x, rlevel->log2_prec_width + reducedresno);
step_y = FFMIN(step_y, rlevel->log2_prec_height + reducedresno);
}
step_x = 1<<step_x;
step_y = 1<<step_y;
for (y = 0; y < s->height; y += step_y) {
for (x = 0; x < s->width; x += step_x) {
for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++) {
uint16_t prcx, prcy;
uint8_t reducedresno = codsty->nreslevels - 1 -reslevelno; // ==> N_L - r