Correct MV prediction for B-frame blocks in RV4 decoder

Originally committed as revision 17974 to svn://svn.ffmpeg.org/ffmpeg/trunk
16 years ago · 0304109df6
parent 3d45a83a59
commit 0304109df6
1 changed files with 1 additions and 1 deletions
--- a/libavcodec/rv34.c
+++ b/libavcodec/rv34.c
@ -533,7 +533,7 @@ static void rv34_pred_mv_b(RV34DecContext *r, int block_type, int dir)
        B[1] = cur_pic->motion_val[dir][mv_pos - s->b8_stride][1];
        has_B = 1;
    }
-    if((r->avail_cache[5-2] & type) & mask){
+    if(r->avail_cache[5-4] && (r->avail_cache[5-2] & type) & mask){
        C[0] = cur_pic->motion_val[dir][mv_pos - s->b8_stride + 2][0];
        C[1] = cur_pic->motion_val[dir][mv_pos - s->b8_stride + 2][1];
        has_C = 1;