libvpx: Pull from upstream

source/libvpx/vp8/common/loopfilter.c

Index: source/libvpx/vp8/common/loopfilter.c
===================================================================
--- source/libvpx/vp8/common/loopfilter.c	(revision 177019)
+++ source/libvpx/vp8/common/loopfilter.c	(working copy)
@@ -567,46 +567,28 @@
     int mb_cols = post->y_width >> 4;
     int mb_rows = post->y_height >> 4;
 
-    int linestocopy, i;
+    int linestocopy;
 
     loop_filter_info_n *lfi_n = &cm->lf_info;
     loop_filter_info lfi;
 
     int filter_level;
-    int alt_flt_enabled = mbd->segmentation_enabled;
     FRAME_TYPE frame_type = cm->frame_type;
 
     const MODE_INFO *mode_info_context;
 
-    int lvl_seg[MAX_MB_SEGMENTS];
+#if 0
+    if(default_filt_lvl == 0) /* no filter applied */
+        return;
+#endif
 
+    /* Initialize the loop filter for this frame. */
+    vp8_loop_filter_frame_init( cm, mbd, default_filt_lvl);
+
     /* number of MB rows to use in partial filtering */
     linestocopy = mb_rows / PARTIAL_FRAME_FRACTION;
     linestocopy = linestocopy ? linestocopy << 4 : 16;     /* 16 lines per MB */
 
-    /* Note the baseline filter values for each segment */
-    /* See vp8_loop_filter_frame_init. Rather than call that for each change
-     * to default_filt_lvl, copy the relevant calculation here.
-     */
-    if (alt_flt_enabled)
-    {
-        for (i = 0; i < MAX_MB_SEGMENTS; i++)
-        {    /* Abs value */
-            if (mbd->mb_segement_abs_delta == SEGMENT_ABSDATA)
-            {
-                lvl_seg[i] = mbd->segment_feature_data[MB_LVL_ALT_LF][i];
-            }
-            /* Delta Value */
-            else
-            {
-                lvl_seg[i] = default_filt_lvl
-                        + mbd->segment_feature_data[MB_LVL_ALT_LF][i];
-                lvl_seg[i] = (lvl_seg[i] > 0) ?
-                        ((lvl_seg[i] > 63) ? 63: lvl_seg[i]) : 0;
-            }
-        }
-    }
-
     /* Set up the buffer pointers; partial image starts at ~middle of frame */
     y_ptr = post->y_buffer + ((post->y_height >> 5) * 16) * post->y_stride;
     mode_info_context = cm->mi + (post->y_height >> 5) * (mb_cols + 1);
@@ -620,11 +602,13 @@
                            mode_info_context->mbmi.mode != SPLITMV &&
                            mode_info_context->mbmi.mb_skip_coeff);
 
-            if (alt_flt_enabled)
-                filter_level = lvl_seg[mode_info_context->mbmi.segment_id];
-            else
-                filter_level = default_filt_lvl;
+            const int mode_index =
+                lfi_n->mode_lf_lut[mode_info_context->mbmi.mode];
+            const int seg = mode_info_context->mbmi.segment_id;
+            const int ref_frame = mode_info_context->mbmi.ref_frame;
 
+            filter_level = lfi_n->lvl[seg][ref_frame][mode_index];
+
             if (filter_level)
             {
                 if (cm->filter_type == NORMAL_LOOPFILTER)