Fix another multithreaded encoder loopfilter race condition

After a key frame encoding, the frame type could change while
filtering is still going on. Pass the frame type as parameter to the
loopfilter function and don't read it from common storage.

vp8cx_set_alt_lf_level has to be done before packing the stream.
Currently alt_lf_level is not used so there hasn't been any visible
problem here.

Change-Id: Ia114162158cd833c2b16e3b89303cc9c91f19165

vp8/common/loopfilter.c

@@ -196,18 +196,14 @@ void vp8_loop_filter_frame_init(VP8_COMMON *cm,
     }
 }
 
-void vp8_loop_filter_frame
-(
-    VP8_COMMON *cm,
-    MACROBLOCKD *mbd
-)
+void vp8_loop_filter_frame(VP8_COMMON *cm,
+                           MACROBLOCKD *mbd,
+                           int frame_type)
 {
     YV12_BUFFER_CONFIG *post = cm->frame_to_show;
     loop_filter_info_n *lfi_n = &cm->lf_info;
     loop_filter_info lfi;
 
-    FRAME_TYPE frame_type = cm->frame_type;
-
     int mb_row;
     int mb_col;
     int mb_rows = cm->mb_rows;

vp8/common/loopfilter.h

@@ -76,7 +76,8 @@ void vp8_loop_filter_frame_init(struct VP8Common *cm,
                                 struct macroblockd *mbd,
                                 int default_filt_lvl);
 
-void vp8_loop_filter_frame(struct VP8Common *cm, struct macroblockd *mbd);
+void vp8_loop_filter_frame(struct VP8Common *cm, struct macroblockd *mbd,
+                           int frame_type);
 
 void vp8_loop_filter_partial_frame(struct VP8Common *cm,
                                    struct macroblockd *mbd,

vp8/decoder/onyxd_if.c

@@ -471,7 +471,7 @@ int vp8dx_receive_compressed_data(VP8D_COMP *pbi, unsigned long size, const unsi
         if(cm->filter_level)
         {
             /* Apply the loop filter if appropriate. */
-            vp8_loop_filter_frame(cm, &pbi->mb);
+            vp8_loop_filter_frame(cm, &pbi->mb, cm->frame_type);
         }
         vp8_yv12_extend_frame_borders(cm->frame_to_show);
     }

vp8/encoder/onyx_if.c

@@ -3117,6 +3117,8 @@ static void update_reference_frames(VP8_COMMON *cm)
 
 void vp8_loopfilter_frame(VP8_COMP *cpi, VP8_COMMON *cm)
 {
+    const FRAME_TYPE frame_type = cm->frame_type;
+
     if (cm->no_lpf)
     {
         cm->filter_level = 0;
@@ -3134,6 +3136,11 @@ void vp8_loopfilter_frame(VP8_COMP *cpi, VP8_COMMON *cm)
         else
             vp8cx_pick_filter_level(cpi->Source, cpi);
 
+        if (cm->filter_level > 0)
+        {
+            vp8cx_set_alt_lf_level(cpi, cm->filter_level);
+        }
+
         vpx_usec_timer_mark(&timer);
         cpi->time_pick_lpf += vpx_usec_timer_elapsed(&timer);
     }
@@ -3145,8 +3152,7 @@ void vp8_loopfilter_frame(VP8_COMP *cpi, VP8_COMMON *cm)
 
     if (cm->filter_level > 0)
     {
-        vp8cx_set_alt_lf_level(cpi, cm->filter_level);
-        vp8_loop_filter_frame(cm, &cpi->mb.e_mbd);
+        vp8_loop_filter_frame(cm, &cpi->mb.e_mbd, frame_type);
     }
 
     vp8_yv12_extend_frame_borders(cm->frame_to_show);