[FFmpeg-cvslog] avfilter/vf_lenscorrection: fix division by zero
Paul B Mahol
git at videolan.org
Thu Apr 14 01:08:09 EEST 2022
ffmpeg | branch: release/3.4 | Paul B Mahol <onemda at gmail.com> | Sun Oct 13 23:28:16 2019 +0200| [32a384519a57ad850789636c4c686091a53ce217] | committer: Michael Niedermayer
avfilter/vf_lenscorrection: fix division by zero
Fixes #8265
(cherry picked from commit 19587c9332f5be4f6bc6d7b2b8ef3fd21dfeaa01)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=32a384519a57ad850789636c4c686091a53ce217
---
libavfilter/vf_lenscorrection.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/libavfilter/vf_lenscorrection.c b/libavfilter/vf_lenscorrection.c
index 239fe195bd..43f3c1b7d0 100644
--- a/libavfilter/vf_lenscorrection.c
+++ b/libavfilter/vf_lenscorrection.c
@@ -155,10 +155,8 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
for (plane = 0; plane < rect->nb_planes; ++plane) {
int hsub = plane == 1 || plane == 2 ? rect->hsub : 0;
int vsub = plane == 1 || plane == 2 ? rect->vsub : 0;
- int hdiv = 1 << hsub;
- int vdiv = 1 << vsub;
- int w = rect->width / hdiv;
- int h = rect->height / vdiv;
+ int w = AV_CEIL_RSHIFT(rect->width, hsub);
+ int h = AV_CEIL_RSHIFT(rect->height, vsub);
int xcenter = rect->cx * w;
int ycenter = rect->cy * h;
int k1 = rect->k1 * (1<<24);
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