ffmpeg | branch: master | Michael Niedermayer <[email protected]> | Wed Jun 24 17:07:27 2015 +0200| [ffa1de8a3b93139097214bc600d356ab62bfdf05] | committer: Michael Niedermayer
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 <[email protected]> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=ffa1de8a3b93139097214bc600d356ab62bfdf05 --- libavcodec/jpeg2000dec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c index 11f4cd6..43568ea 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; } } _______________________________________________ ffmpeg-cvslog mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog
