ituh263dec: Implement enough of Annex O (scalability) to fix a FPE.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

libavcodec/ituh263dec.c

@@ -1083,6 +1083,22 @@ int ff_h263_decode_picture_header(MpegEncContext *s)
         skip_bits(&s->gb, 2); /* Quantization information for B-pictures */
     }
 
+    if (s->pict_type!=AV_PICTURE_TYPE_B) {
+        s->time            = s->picture_number;
+        s->pp_time         = s->time - s->last_non_b_time;
+        s->last_non_b_time = s->time;
+    }else{
+        s->time    = s->picture_number;
+        s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
+        if (s->pp_time <=s->pb_time ||
+            s->pp_time <= s->pp_time - s->pb_time ||
+            s->pp_time <= 0){
+            s->pp_time = 2;
+            s->pb_time = 1;
+        }
+        ff_mpeg4_init_direct_mv(s);
+    }
+
     /* PEI */
     while (get_bits1(&s->gb) != 0) {
         skip_bits(&s->gb, 8);