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Code Issues Releases Activity

avcodec/jpeg2000dec: Fix subsampled decoding

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Fixes part of Ticket3619

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-06-09 00:27:15 +02:00
parent 12ba1b2b4d
commit 074159ed70
2 changed files with 12 additions and 11 deletions
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5
libavcodec/jpeg2000.c
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@ -364,11 +364,6 @@ 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);
if (reslevel->num_precincts_x * (uint64_t)reslevel->num_precincts_y > INT_MAX) {
band->prec = NULL;
return AVERROR(ENOMEM);

18
libavcodec/jpeg2000dec.c
View File

@ -690,6 +690,12 @@ static int init_tile(Jpeg2000DecoderContext *s, int tileno)
comp->coord_o[0][1] = FFMIN((tilex + 1) * s->tile_width + s->tile_offset_x, s->width);
comp->coord_o[1][0] = FFMAX(tiley * s->tile_height + s->tile_offset_y, s->image_offset_y);
comp->coord_o[1][1] = FFMIN((tiley + 1) * s->tile_height + s->tile_offset_y, s->height);
if (compno) {
comp->coord_o[0][0] /= s->cdx[compno];
comp->coord_o[0][1] /= s->cdx[compno];
comp->coord_o[1][0] /= s->cdy[compno];
comp->coord_o[1][1] /= s->cdy[compno];
}
comp->coord[0][0] = ff_jpeg2000_ceildivpow2(comp->coord_o[0][0], s->reduction_factor);
comp->coord[0][1] = ff_jpeg2000_ceildivpow2(comp->coord_o[0][1], s->reduction_factor);
@ -1260,14 +1266,14 @@ static int jpeg2000_decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
y = tile->comp[compno].coord[1][0] - s->image_offset_y;
line = picture->data[plane] + y / s->cdy[compno] * picture->linesize[plane];
for (; y < tile->comp[compno].coord[1][1] - s->image_offset_y; y += s->cdy[compno]) {
for (; y < tile->comp[compno].coord[1][1] - s->image_offset_y; y ++) {
uint8_t *dst;
x = tile->comp[compno].coord[0][0] - s->image_offset_x;
dst = line + x / s->cdx[compno] * pixelsize + compno*!planar;
if (codsty->transform == FF_DWT97) {
for (; x < w; x += s->cdx[compno]) {
for (; x < w; x ++) {
int val = lrintf(*datap) + (1 << (cbps - 1));
/* DC level shift and clip see ISO 15444-1:2002 G.1.2 */
val = av_clip(val, 0, (1 << cbps) - 1);
@ -1276,7 +1282,7 @@ static int jpeg2000_decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
dst += pixelsize;
}
} else {
for (; x < w; x += s->cdx[compno]) {
for (; x < w; x ++) {
int val = *i_datap + (1 << (cbps - 1));
/* DC level shift and clip see ISO 15444-1:2002 G.1.2 */
val = av_clip(val, 0, (1 << cbps) - 1);
@ -1306,13 +1312,13 @@ static int jpeg2000_decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
y = tile->comp[compno].coord[1][0] - s->image_offset_y;
linel = (uint16_t *)picture->data[plane] + y / s->cdy[compno] * (picture->linesize[plane] >> 1);
for (; y < tile->comp[compno].coord[1][1] - s->image_offset_y; y += s->cdy[compno]) {
for (; y < tile->comp[compno].coord[1][1] - s->image_offset_y; y ++) {
uint16_t *dst;
x = tile->comp[compno].coord[0][0] - s->image_offset_x;
dst = linel + (x / s->cdx[compno] * pixelsize + compno*!planar);
if (codsty->transform == FF_DWT97) {
for (; x < w; x += s-> cdx[compno]) {
for (; x < w; x ++) {
int val = lrintf(*datap) + (1 << (cbps - 1));
/* DC level shift and clip see ISO 15444-1:2002 G.1.2 */
val = av_clip(val, 0, (1 << cbps) - 1);
@ -1322,7 +1328,7 @@ static int jpeg2000_decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
dst += pixelsize;
}
} else {
for (; x < w; x += s-> cdx[compno]) {
for (; x < w; x ++) {
int val = *i_datap + (1 << (cbps - 1));
/* DC level shift and clip see ISO 15444-1:2002 G.1.2 */
val = av_clip(val, 0, (1 << cbps) - 1);