[FFmpeg-cvslog] lavc/vc2enc_dwt: Avoid left-shifting a negative value.

[Carl Eugen Hoyos]

ffmpeg | branch: master | Carl Eugen Hoyos <ceffmpeg at gmail.com> | Tue Jul  2 11:38:14 2019 +0200| [ac457a3bc589d4b6d2438942354f4f69f07a598e] | committer: Carl Eugen Hoyos

lavc/vc2enc_dwt: Avoid left-shifting a negative value.

Fixes ticket #7985.

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=ac457a3bc589d4b6d2438942354f4f69f07a598e
---

 libavcodec/vc2enc_dwt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/vc2enc_dwt.c b/libavcodec/vc2enc_dwt.c
index d22af8a313..a8d3f1c669 100644
--- a/libavcodec/vc2enc_dwt.c
+++ b/libavcodec/vc2enc_dwt.c
@@ -66,7 +66,7 @@ static void vc2_subband_dwt_97(VC2TransformContext *t, dwtcoef *data,
      */
     for (y = 0; y < synth_height; y++) {
         for (x = 0; x < synth_width; x++)
-            synthl[x] = datal[x] << 1;
+            synthl[x] = datal[x] * 2;
         synthl += synth_width;
         datal += stride;
     }