[FFmpeg-cvslog] vc1dec.c: Don't use uninitialized values of dmv_[x, y]

[Mashiat Sarker Shakkhar]

ffmpeg | branch: master | Mashiat Sarker Shakkhar <shahriman_ams at yahoo.com> | Thu Jan 26 15:53:24 2012 -0800| [d51d6ae9c41310d62f4582c07c2fad26d41eeca6] | committer: Ronald S. Bultje

vc1dec.c: Don't use uninitialized values of dmv_[x, y]

MVDATA may or may not be transmitted. If it is not, both
dmv_x and dmv_y is to be assumed zero.

This may not trigger wrong picture in all systems, but
it's a bug nevertheless. Fixes SA10116.vc1 on my 64-bit
Windows 7.

Signed-off-by: Ronald S. Bultje <rsbultje at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=d51d6ae9c41310d62f4582c07c2fad26d41eeca6
---

 libavcodec/vc1dec.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index fa95273..325cc64 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -3954,6 +3954,7 @@ static int vc1_decode_p_mb_intfr(VC1Context *v)
                 vc1_mc_4mv_chroma4(v);
             } else {
                 mvbp = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][2];
+                dmv_x = dmv_y = 0;
                 if (mvbp) {
                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
                 }