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libavcodec/jpeg2000dec.c: Modify image dimensions

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Reduce image size of the image if all components have
a non zero sample separation. This is to replicate the
output of opj_decompress.

Improves: p1_01.j2k

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Gautam Ramakrishnan 2020-06-22 00:12:05 +05:30 committed by Michael Niedermayer
parent b35968e060
commit 2760de16bc
1 changed files with 14 additions and 5 deletions
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19
libavcodec/jpeg2000dec.c
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@ -269,6 +269,8 @@ static int get_siz(Jpeg2000DecoderContext *s)
const enum AVPixelFormat *possible_fmts = NULL;
int possible_fmts_nb = 0;
int ret;
int o_dimx, o_dimy; //original image dimensions.
int dimx, dimy;
if (bytestream2_get_bytes_left(&s->g) < 36) {
av_log(s->avctx, AV_LOG_ERROR, "Insufficient space for SIZ\n");
@ -371,11 +373,18 @@ static int get_siz(Jpeg2000DecoderContext *s)
}
/* compute image size with reduction factor */
ret = ff_set_dimensions(s->avctx,
ff_jpeg2000_ceildivpow2(s->width - s->image_offset_x,
s->reduction_factor),
ff_jpeg2000_ceildivpow2(s->height - s->image_offset_y,
s->reduction_factor));
o_dimx = ff_jpeg2000_ceildivpow2(s->width - s->image_offset_x,
s->reduction_factor);
o_dimy = ff_jpeg2000_ceildivpow2(s->height - s->image_offset_y,
s->reduction_factor);
dimx = ff_jpeg2000_ceildiv(o_dimx, s->cdx[0]);
dimy = ff_jpeg2000_ceildiv(o_dimy, s->cdy[0]);
for (i = 1; i < s->ncomponents; i++) {
dimx = FFMAX(dimx, ff_jpeg2000_ceildiv(o_dimx, s->cdx[i]));
dimy = FFMAX(dimy, ff_jpeg2000_ceildiv(o_dimy, s->cdy[i]));
}
ret = ff_set_dimensions(s->avctx, dimx, dimy);
if (ret < 0)
return ret;