vc1: Fix ordering of loop filter for I/B frames

All horizontal edges must be filtered before all vertical edges

Originally committed as revision 24206 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/vc1dec.c

@@ -162,17 +162,27 @@ enum Imode {
 
 static void vc1_loop_filter_iblk(MpegEncContext *s, int pq)
 {
-    int i, j;
-    if(!s->first_slice_line)
+    int j;
+    if (!s->first_slice_line) {
         s->dsp.vc1_v_loop_filter16(s->dest[0], s->linesize, pq);
-    s->dsp.vc1_v_loop_filter16(s->dest[0] + 8*s->linesize, s->linesize, pq);
-    for(i = !s->mb_x*8; i < 16; i += 8)
-        s->dsp.vc1_h_loop_filter16(s->dest[0] + i, s->linesize, pq);
-    for(j = 0; j < 2; j++){
-        if(!s->first_slice_line)
+        if (s->mb_x)
+            s->dsp.vc1_h_loop_filter16(s->dest[0] - 16*s->linesize, s->linesize, pq);
+        s->dsp.vc1_h_loop_filter16(s->dest[0] - 16*s->linesize+8, s->linesize, pq);
+        for(j = 0; j < 2; j++){
             s->dsp.vc1_v_loop_filter8(s->dest[j+1], s->uvlinesize, pq);
-        if(s->mb_x)
-            s->dsp.vc1_h_loop_filter8(s->dest[j+1], s->uvlinesize, pq);
+            if (s->mb_x)
+                s->dsp.vc1_h_loop_filter8(s->dest[j+1]-8*s->uvlinesize, s->uvlinesize, pq);
+        }
+    }
+    s->dsp.vc1_v_loop_filter16(s->dest[0] + 8*s->linesize, s->linesize, pq);
+
+    if (s->mb_y == s->mb_height-1) {
+        if (s->mb_x) {
+            s->dsp.vc1_h_loop_filter16(s->dest[0], s->linesize, pq);
+            s->dsp.vc1_h_loop_filter8(s->dest[1], s->uvlinesize, pq);
+            s->dsp.vc1_h_loop_filter8(s->dest[2], s->uvlinesize, pq);
+        }
+        s->dsp.vc1_h_loop_filter16(s->dest[0] + 8, s->linesize, pq);
     }
 }