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vp9: Copy partition using avg_source_sad.

Affecting only speed 8.
Speed tests on Nexus 6 show 4% faster for QVGA and 2.4% faster for VGA.
Little/negligible quality regression observed on both rtc and rtc_derf sets.

Change-Id: I337f301a2db49a568d18ba7623160f7678399ae1

--- a/vp9/encoder/vp9_encodeframe.c

+++ b/vp9/encoder/vp9_encodeframe.c

@@ -925,12 +925,7 @@

   int variance4x4downsample[16];

   int segment_id;

   int sb_offset = (cm->mi_stride >> 3) * (mi_row >> 3) + (mi_col >> 3);

-  if (cpi->sf.use_source_sad && !is_key_frame) {

-    // The sb_offset2 is to make it consistent with the index in the function

-    // vp9_avg_source_sad() in vp9_ratectrl.c.

-    int sb_offset2 = ((cm->mi_cols + 7) >> 3) * (mi_row >> 3) + (mi_col >> 3);

-    x->skip_low_source_sad = cpi->avg_source_sad_sb[sb_offset2] == 1 ? 1 : 0;

-  }

+

   set_offsets(cpi, tile, x, mi_row, mi_col, BLOCK_64X64);

   segment_id = xd->mi[0]->segment_id;

   if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cm->seg.enabled) {

@@ -937,6 +932,28 @@

     if (cyclic_refresh_segment_id_boosted(segment_id)) {

       int q = vp9_get_qindex(&cm->seg, segment_id, cm->base_qindex);

       set_vbp_thresholds(cpi, thresholds, q);

+    }

+  }

+

+  if (cpi->sf.use_source_sad && !is_key_frame) {

+    // The sb_offset2 is to make it consistent with the index in the function

+    // vp9_avg_source_sad() in vp9_ratectrl.c.

+    int sb_offset2 = ((cm->mi_cols + 7) >> 3) * (mi_row >> 3) + (mi_col >> 3);

+    x->skip_low_source_sad = cpi->avg_source_sad_sb[sb_offset2] == 1 ? 1 : 0;

+    // If avg_source_sad is lower than the threshold, copy the partition without

+    // computing the y_sad.

+    if (cpi->avg_source_sad_sb[sb_offset2] && cpi->sf.copy_partition_flag &&

+        cpi->rc.frames_since_key > 1 && segment_id == CR_SEGMENT_ID_BASE &&

+        cpi->prev_segment_id[sb_offset] == CR_SEGMENT_ID_BASE &&

+        cpi->copied_frame_cnt[sb_offset] < cpi->max_copied_frame) {

+      if (cpi->prev_partition != NULL) {

+        copy_prev_partition(cpi, BLOCK_64X64, mi_row, mi_col);

+        chroma_check(cpi, x, bsize, y_sad, is_key_frame);

+        cpi->copied_frame_cnt[sb_offset] += 1;

+        memcpy(x->variance_low, &(cpi->prev_variance_low[sb_offset * 25]),

+               sizeof(x->variance_low));

+        return 0;

+      }

     }

   }