From d8cb5887c1cab236a36ddb4949610b67e16f57ed Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Sun, 10 Jan 2016 17:43:56 +0100
Subject: [PATCH] avcodec/dvdec: Fix "left shift of negative value -254"

Fixes: dvdec_left_shift.avi

Found-by: Piotr Bandurski <ami_stuff@o2.pl>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 93ac72a98dff592ffc174cfb36a8975dfbf145ae)

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/dvdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/dvdec.c b/libavcodec/dvdec.c
index 7de7e5b4ce..ccf326923d 100644
--- a/libavcodec/dvdec.c
+++ b/libavcodec/dvdec.c
@@ -221,7 +221,7 @@ static int dv_decode_video_segment(AVCodecContext *avctx, void *arg)
                                     dct_mode                        * 22 * 64 +
                                     (quant + ff_dv_quant_offset[class1]) * 64];
             }
-            dc = dc << 2;
+            dc = dc * 4;
             /* convert to unsigned because 128 is not added in the
              * standard IDCT */
             dc                   += 1024;