moved segment based LPF level selection under CONFIG_FEATUREUPDATES

This commit moved segment based loop filter level selection into
the experiment of CONFIG_FEATUREUPDATES. As previous commit noted,
the segment based loop filter selection helps the compression by
~0.1% on cif set, the ongoing experiment CONFIG_FEATUREUPDATES
made encoding updates of the segment based LPF level more efficient,
hence, another .04% gain on cif set. The commit also fixed an issue
previously where encoder/decoder may use different loop filter level
for one of the segments.

Change-Id: Ia978b14aae95bb107d561ba53a7a2bb6ff01faf3

configure

@@ -226,7 +226,7 @@ EXPERIMENT_LIST="
     newlpf
     enhanced_interp
     superblocks
-    feature_updates
+    featureupdates
 "
 CONFIG_LIST="
     external_build

vp8/common/loopfilter.c

@@ -576,7 +576,7 @@ void vp8_loop_filter_frame_yonly
     }
 
 }
-
+#if CONFIG_FEATUREUPDATES
 // TODO: Multiple copies of loop filtering code should be pruned and
 // cut down.   This just adds yet another so that I can do an if
 // on segment.
@@ -707,7 +707,7 @@ void vp8_loop_filter_frame_segment(VP8_COMMON *cm, MACROBLOCKD *xd,
     }
 
 }
-
+#endif
 
 void vp8_loop_filter_partial_frame
 (

vp8/encoder/picklpf.c

@@ -268,8 +268,7 @@ void vp8cx_pick_filter_level_fast(YV12_BUFFER_CONFIG *sd, VP8_COMP *cpi)
 void vp8cx_set_alt_lf_level(VP8_COMP *cpi, int filt_val)
 {
 }
-
+#if CONFIG_FEATUREUPDATES
-
 void vp8cx_pick_filter_level_sg(YV12_BUFFER_CONFIG *sd, VP8_COMP *cpi, int segment)
 {
     VP8_COMMON *cm = &cpi->common;
@@ -483,5 +482,184 @@ void vp8cx_pick_filter_level(YV12_BUFFER_CONFIG *sd, VP8_COMP *cpi)
         if (segfeature_active(xd, i, SEG_LVL_ALT_LF))
         {
             set_segdata(xd, i, SEG_LVL_ALT_LF, filt_lev[i] - filt_lev[0]);
+            xd->update_mb_segmentation_data !=
+                                    segfeature_changed( xd,i,SEG_LVL_ALT_LF);
         }
 }
+#else
+void vp8cx_pick_filter_level(YV12_BUFFER_CONFIG *sd, VP8_COMP *cpi)
+{
+    VP8_COMMON *cm = &cpi->common;
+
+    int best_err = 0;
+    int filt_err = 0;
+    int min_filter_level = get_min_filter_level(cpi, cm->base_qindex);
+    int max_filter_level = get_max_filter_level(cpi, cm->base_qindex);
+
+    int filter_step;
+    int filt_high = 0;
+    int filt_mid = cm->filter_level;      // Start search at previous frame filter level
+    int filt_low = 0;
+    int filt_best;
+    int filt_direction = 0;
+
+    int Bias = 0;                       // Bias against raising loop filter and in favour of lowering it
+
+    //  Make a copy of the unfiltered / processed recon buffer
+#if HAVE_ARMV7
+#if CONFIG_RUNTIME_CPU_DETECT
+    if (cm->rtcd.flags & HAS_NEON)
+#endif
+    {
+        vp8_yv12_copy_frame_yonly_no_extend_frame_borders_neon(cm->frame_to_show, &cpi->last_frame_uf);
+    }
+#if CONFIG_RUNTIME_CPU_DETECT
+    else
+#endif
+#endif
+#if !HAVE_ARMV7 || CONFIG_RUNTIME_CPU_DETECT
+    {
+        vp8_yv12_copy_frame_ptr(cm->frame_to_show, &cpi->last_frame_uf);
+    }
+#endif
+
+    if (cm->frame_type == KEY_FRAME)
+        cm->sharpness_level = 0;
+    else
+        cm->sharpness_level = cpi->oxcf.Sharpness;
+
+    // Start the search at the previous frame filter level unless it is now out of range.
+    filt_mid = cm->filter_level;
+
+    if (filt_mid < min_filter_level)
+        filt_mid = min_filter_level;
+    else if (filt_mid > max_filter_level)
+        filt_mid = max_filter_level;
+
+    // Define the initial step size
+    filter_step = (filt_mid < 16) ? 4 : filt_mid / 4;
+
+    // Get baseline error score
+    vp8cx_set_alt_lf_level(cpi, filt_mid);
+    vp8_loop_filter_frame_yonly(cm, &cpi->mb.e_mbd, filt_mid);
+
+    best_err = vp8_calc_ss_err(sd, cm->frame_to_show, IF_RTCD(&cpi->rtcd.variance));
+    filt_best = filt_mid;
+
+    //  Re-instate the unfiltered frame
+#if HAVE_ARMV7
+#if CONFIG_RUNTIME_CPU_DETECT
+    if (cm->rtcd.flags & HAS_NEON)
+#endif
+    {
+        vp8_yv12_copy_frame_yonly_no_extend_frame_borders_neon(&cpi->last_frame_uf, cm->frame_to_show);
+    }
+#if CONFIG_RUNTIME_CPU_DETECT
+    else
+#endif
+#endif
+#if !HAVE_ARMV7 || CONFIG_RUNTIME_CPU_DETECT
+    {
+        vp8_yv12_copy_frame_yonly_ptr(&cpi->last_frame_uf, cm->frame_to_show);
+    }
+#endif
+
+    while (filter_step > 0)
+    {
+        Bias = (best_err >> (15 - (filt_mid / 8))) * filter_step; //PGW change 12/12/06 for small images
+
+        // jbb chg: 20100118 - in sections with lots of new material coming in don't bias as much to a low filter value
+        if (cpi->twopass.section_intra_rating < 20)
+            Bias = Bias * cpi->twopass.section_intra_rating / 20;
+
+        filt_high = ((filt_mid + filter_step) > max_filter_level) ? max_filter_level : (filt_mid + filter_step);
+        filt_low = ((filt_mid - filter_step) < min_filter_level) ? min_filter_level : (filt_mid - filter_step);
+
+        if ((filt_direction <= 0) && (filt_low != filt_mid))
+        {
+            // Get Low filter error score
+            vp8cx_set_alt_lf_level(cpi, filt_low);
+            vp8_loop_filter_frame_yonly(cm, &cpi->mb.e_mbd, filt_low);
+
+            filt_err = vp8_calc_ss_err(sd, cm->frame_to_show, IF_RTCD(&cpi->rtcd.variance));
+
+            //  Re-instate the unfiltered frame
+#if HAVE_ARMV7
+#if CONFIG_RUNTIME_CPU_DETECT
+            if (cm->rtcd.flags & HAS_NEON)
+#endif
+            {
+                vp8_yv12_copy_frame_yonly_no_extend_frame_borders_neon(&cpi->last_frame_uf, cm->frame_to_show);
+            }
+#if CONFIG_RUNTIME_CPU_DETECT
+            else
+#endif
+#endif
+#if !HAVE_ARMV7 || CONFIG_RUNTIME_CPU_DETECT
+            {
+                vp8_yv12_copy_frame_yonly_ptr(&cpi->last_frame_uf, cm->frame_to_show);
+            }
+#endif
+
+            // If value is close to the best so far then bias towards a lower loop filter value.
+            if ((filt_err - Bias) < best_err)
+            {
+                // Was it actually better than the previous best?
+                if (filt_err < best_err)
+                    best_err = filt_err;
+
+                filt_best = filt_low;
+            }
+        }
+
+        // Now look at filt_high
+        if ((filt_direction >= 0) && (filt_high != filt_mid))
+        {
+            vp8cx_set_alt_lf_level(cpi, filt_high);
+            vp8_loop_filter_frame_yonly(cm, &cpi->mb.e_mbd, filt_high);
+
+            filt_err = vp8_calc_ss_err(sd, cm->frame_to_show, IF_RTCD(&cpi->rtcd.variance));
+
+            //  Re-instate the unfiltered frame
+#if HAVE_ARMV7
+#if CONFIG_RUNTIME_CPU_DETECT
+            if (cm->rtcd.flags & HAS_NEON)
+#endif
+            {
+                vp8_yv12_copy_frame_yonly_no_extend_frame_borders_neon(&cpi->last_frame_uf, cm->frame_to_show);
+            }
+#if CONFIG_RUNTIME_CPU_DETECT
+            else
+#endif
+#endif
+#if !HAVE_ARMV7 || CONFIG_RUNTIME_CPU_DETECT
+            {
+                vp8_yv12_copy_frame_yonly_ptr(&cpi->last_frame_uf, cm->frame_to_show);
+            }
+#endif
+
+            // Was it better than the previous best?
+            if (filt_err < (best_err - Bias))
+            {
+                best_err = filt_err;
+                filt_best = filt_high;
+            }
+        }
+
+        // Half the step distance if the best filter value was the same as last time
+        if (filt_best == filt_mid)
+        {
+            filter_step = filter_step / 2;
+            filt_direction = 0;
+        }
+        else
+        {
+            filt_direction = (filt_best < filt_mid) ? -1 : 1;
+            filt_mid = filt_best;
+        }
+    }
+
+    cm->filter_level = filt_best;
+}
+#endif
+