avcodec/mjpegdec: Fix negative shift

Fixes: mjpeg_left_shift.avi Found-by: Piotr Bandurski <ami_stuff@o2.pl> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
9 years ago · d86d7b2486
parent f587ed0cbb
commit d86d7b2486
1 changed files with 1 additions and 1 deletions
--- a/libavcodec/mjpegdec.c
+++ b/libavcodec/mjpegdec.c
@ -999,7 +999,7 @@ static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int nb_components, int p
                    return -1;

                left[i] = buffer[mb_x][i] =
-                    mask & (pred + (dc << point_transform));
+                    mask & (pred + (dc * (1 << point_transform)));
            }

            if (s->restart_interval && !--s->restart_count) {