[FFmpeg-cvslog] avcodec/dvdec: Fix "left shift of negative value -254"
Michael Niedermayer
git at videolan.org
Fri Jan 15 16:23:53 CET 2016
ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Sun Jan 10 17:43:56 2016 +0100| [b8382a1faeb24662eb9197d32b1bae434a803daa] | committer: Michael Niedermayer
avcodec/dvdec: Fix "left shift of negative value -254"
Fixes: dvdec_left_shift.avi
Found-by: Piotr Bandurski <ami_stuff at o2.pl>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 93ac72a98dff592ffc174cfb36a8975dfbf145ae)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b8382a1faeb24662eb9197d32b1bae434a803daa
---
libavcodec/dvdec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/dvdec.c b/libavcodec/dvdec.c
index 679075e..1a3983b 100644
--- a/libavcodec/dvdec.c
+++ b/libavcodec/dvdec.c
@@ -347,7 +347,7 @@ retry:
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;
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