diff options
| author | Michael Niedermayer <michaelni@gmx.at> | 2015-06-24 17:07:27 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2015-06-24 17:09:21 +0200 |
| commit | ffa1de8a3b93139097214bc600d356ab62bfdf05 (patch) | |
| tree | 0b65d12ed8552c69f71d306261e9adabe19f7421 /libavcodec | |
| parent | 05ef6324d11017420a087150f2addbb18cdb9ad3 (diff) | |
avcodec/jpeg2000dec: Use 32x32->64bit for 9/7i dequantization
Like the 5/3 case this is needed to avoid overflows and similarly for 16bpp
output pure 32bit operations are insufficient if high quality is wanted
Note, this code-path is only used in bitexact mode, so this should not
affect the speed of any real use-case
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavcodec')
| -rw-r--r-- | libavcodec/jpeg2000dec.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c index 11f4cd6ff6..43568ea0eb 100644 --- a/libavcodec/jpeg2000dec.c +++ b/libavcodec/jpeg2000dec.c @@ -1457,7 +1457,7 @@ static void dequantization_int_97(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] * (int64_t)band->i_stepsize + (1<<14)) >> 15; } } |