Factor out block decoding in ff_h263_decode_mb()

Originally committed as revision 17734 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/h263.c

@@ -4005,18 +4005,6 @@ int ff_h263_decode_mb(MpegEncContext *s,
                 mot_val[1] = my;
             }
         }
-
-        /* decode each block */
-        for (i = 0; i < 6; i++) {
-            if (h263_decode_block(s, block[i], i, cbp&32) < 0)
-                return -1;
-            cbp+=cbp;
-        }
-
-        if(s->obmc){
-            if(s->pict_type == FF_P_TYPE && s->mb_x+1<s->mb_width && s->mb_num_left != 1)
-                preview_obmc(s);
-        }
     } else if(s->pict_type==FF_B_TYPE) {
         int mb_type;
         const int stride= s->b8_stride;
@@ -4105,13 +4093,6 @@ int ff_h263_decode_mb(MpegEncContext *s,
         }
 
         s->current_picture.mb_type[xy]= mb_type;
-
-        /* decode each block */
-        for (i = 0; i < 6; i++) {
-            if (h263_decode_block(s, block[i], i, cbp&32) < 0)
-                return -1;
-            cbp+=cbp;
-        }
     } else { /* I-Frame */
         do{
             cbpc = get_vlc2(&s->gb, intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
@@ -4146,13 +4127,18 @@ intra:
         if (dquant) {
             h263_decode_dquant(s);
         }
+    }
 
-        /* decode each block */
-        for (i = 0; i < 6; i++) {
-            if (h263_decode_block(s, block[i], i, cbp&32) < 0)
-                return -1;
-            cbp+=cbp;
-        }
+    /* decode each block */
+    for (i = 0; i < 6; i++) {
+        if (h263_decode_block(s, block[i], i, cbp&32) < 0)
+            return -1;
+        cbp+=cbp;
+    }
+
+    if(s->obmc && !s->mb_intra){
+        if(s->pict_type == FF_P_TYPE && s->mb_x+1<s->mb_width && s->mb_num_left != 1)
+            preview_obmc(s);
     }
 end: