[FFmpeg-cvslog] avcodec/snowenc: Fix invalid left shift of negative numbers

[Andreas Rheinhardt]

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at outlook.com> | Fri Oct 21 17:14:19 2022 +0200| [a14c5af58db7068536d3ce2331ea8507c5dc5a39] | committer: Andreas Rheinhardt

avcodec/snowenc: Fix invalid left shift of negative numbers

Affected the vsynth(1|2|_lena)-snow(|-hpel) tests.

Reviewed-by: Michael Niedermayer <michael at niedermayer.cc>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a14c5af58db7068536d3ce2331ea8507c5dc5a39
---

 libavcodec/snowenc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/snowenc.c b/libavcodec/snowenc.c
index ea0d4fc27f..ada24f7895 100644
--- a/libavcodec/snowenc.c
+++ b/libavcodec/snowenc.c
@@ -935,7 +935,7 @@ static av_always_inline int check_block_inter(SnowContext *s, int mb_x, int mb_y
     av_assert2(mb_x < b_stride);
 
     index = (p0 + 31 * p1) & (ME_CACHE_SIZE-1);
-    value = s->me_cache_generation + (p0 >> 10) + (p1 << 6) + (block->ref << 12);
+    value = s->me_cache_generation + (p0 >> 10) + p1 * (1 << 6) + (block->ref << 12);
     if (s->me_cache[index] == value)
         return 0;
     s->me_cache[index] = value;