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| author | Michael Niedermayer <michaelni@gmx.at> | 2015-06-09 02:01:40 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2015-06-09 02:17:53 +0200 |
| commit | 7c9fcdfabd4c8d37d8e588b39e7786cf55ed5989 (patch) | |
| tree | e5fb1220c28e001c298172e66c4ff8f4e8fdf4cb /libavcodec/jpeg2000dec.c | |
| parent | ecefce41d9f9fd10a8f564b011cd565cff2eb3ef (diff) | |
| download | ffmpeg-7c9fcdfabd4c8d37d8e588b39e7786cf55ed5989.tar.gz | |
avcodec/jpeg2000dec: Fix some 5/3 bitexactness issues
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavcodec/jpeg2000dec.c')
| -rw-r--r-- | libavcodec/jpeg2000dec.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c index 537f6e2a4e..ba0d259778 100644 --- a/libavcodec/jpeg2000dec.c +++ b/libavcodec/jpeg2000dec.c @@ -1145,7 +1145,21 @@ static void dequantization_int(int x, int y, Jpeg2000Cblk *cblk, int32_t *datap = &comp->i_data[(comp->coord[0][1] - comp->coord[0][0]) * (y + j) + x]; int *src = t1->data[j]; for (i = 0; i < w; ++i) - datap[i] = (src[i] * band->i_stepsize + (1 << 14)) >> 15; + datap[i] = (src[i] * band->i_stepsize) / 32768; + } +} + +static void dequantization_int_97(int x, int y, Jpeg2000Cblk *cblk, + Jpeg2000Component *comp, + Jpeg2000T1Context *t1, Jpeg2000Band *band) +{ + int i, j; + int w = cblk->coord[0][1] - cblk->coord[0][0]; + for (j = 0; j < (cblk->coord[1][1] - cblk->coord[1][0]); ++j) { + int32_t *datap = &comp->i_data[(comp->coord[0][1] - comp->coord[0][0]) * (y + j) + x]; + int *src = t1->data[j]; + for (i = 0; i < w; ++i) + datap[i] = (src[i] * band->i_stepsize + (1<<14)) >> 15; } } @@ -1228,6 +1242,8 @@ static int jpeg2000_decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile, if (codsty->transform == FF_DWT97) dequantization_float(x, y, cblk, comp, &t1, band); + else if (codsty->transform == FF_DWT97_INT) + dequantization_int_97(x, y, cblk, comp, &t1, band); else dequantization_int(x, y, cblk, comp, &t1, band); } /* end cblk */ |