[SCM] libav/experimental: Edge emulation should be used in B-frame MC in mspel mode with mv_x < 1 or mv_y < 1.

[siretart at users.alioth.debian.org]

The following commit has been merged in the experimental branch:
commit 74a30595b276403f2af5ca1a0235c41509b84784
Author: Kostya Shishkov <kostya.shishkov at gmail.com>
Date:   Tue Jun 23 07:41:38 2009 +0000

    Edge emulation should be used in B-frame MC in mspel mode with
    mv_x < 1 or mv_y < 1.
    
    Originally committed as revision 19255 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index 7aa104a..96055e6 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -860,8 +860,8 @@ static void vc1_interp_mc(VC1Context *v)
     }
 
     if(v->rangeredfrm
-       || (unsigned)src_x > s->h_edge_pos - (mx&3) - 16 - s->mspel*3
-       || (unsigned)src_y > s->v_edge_pos - (my&3) - 16 - s->mspel*3){
+       || (unsigned)(src_x - s->mspel) > s->h_edge_pos - (mx&3) - 16 - s->mspel*3
+       || (unsigned)(src_y - s->mspel) > s->v_edge_pos - (my&3) - 16 - s->mspel*3){
         uint8_t *uvbuf= s->edge_emu_buffer + 19 * s->linesize;
 
         srcY -= s->mspel * (1 + s->linesize);

-- 
Libav/FFmpeg packaging