[FFmpeg-cvslog] swscale/utils: Fix invalid left shifts of negative numbers

[Andreas Rheinhardt]

ffmpeg | branch: release/4.2 | Andreas Rheinhardt <andreas.rheinhardt at gmail.com> | Sat Sep 28 04:26:02 2019 +0200| [4b75d960b69c633e3f78d1972b3a7fc63a336b33] | committer: Andreas Rheinhardt

swscale/utils: Fix invalid left shifts of negative numbers

Affected the FATE-tests vsynth_lena-dv-411, vsynth1-dv-411,
vsynth2-dv-411 and hevc-paramchange-yuv420p.yuv420p10.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit e2646e23be69bdef1e41d4decee1a4298701b8d1)

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4b75d960b69c633e3f78d1972b3a7fc63a336b33
---

 libswscale/utils.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libswscale/utils.c b/libswscale/utils.c
index 1b1f779532..57c4fd2b0f 100644
--- a/libswscale/utils.c
+++ b/libswscale/utils.c
@@ -390,7 +390,7 @@ static av_cold int initFilter(int16_t **outFilter, int32_t **filterPos,
             (*filterPos)[i] = xx;
             // bilinear upscale / linear interpolate / area averaging
             for (j = 0; j < filterSize; j++) {
-                int64_t coeff= fone - FFABS(((int64_t)xx<<16) - xDstInSrc)*(fone>>16);
+                int64_t coeff = fone - FFABS((int64_t)xx * (1 << 16) - xDstInSrc) * (fone >> 16);
                 if (coeff < 0)
                     coeff = 0;
                 filter[i * filterSize + j] = coeff;