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vp9: SVC: Enable copy partition for SVC speed >= 7.

Adjust the max_copied_frame setting for temporal layers.
Keep the same setting for non-SVC at speed 8.
This change also enables copy_partiton for non-SVC at speed 7,
but with smaller value of max_copied_frame (=2).

~2% speedup for SVC speed 7, 3 layers, with little/no quality loss.

Change-Id: Ic65ac9aad764ec65a35770d263424b2393ec6780

--- a/vp9/encoder/vp9_speed_features.c

+++ b/vp9/encoder/vp9_speed_features.c

@@ -560,19 +560,26 @@

             (cm->mi_stride >> 3) * ((cm->mi_rows >> 3) + 1), sizeof(uint8_t));

       }

     }

-  }

-

-  if (speed >= 8) {

-    sf->adaptive_rd_thresh = 4;

-    // Enable partition copy. For SVC, only enabled for top resolution layer,

+    // Enable partition copy. For SVC only enabled for top spatial resolution

+    // layer.

+    cpi->max_copied_frame = 0;

     if (!cpi->last_frame_dropped && cpi->resize_state == ORIG &&

         !cpi->external_resize &&

         (!cpi->use_svc ||

          cpi->svc.spatial_layer_id == cpi->svc.number_spatial_layers - 1)) {

       sf->copy_partition_flag = 1;

-      cpi->max_copied_frame = 4;

+      cpi->max_copied_frame = 2;

+      // The top temporal enhancement layer (for number of temporal layers > 1)

+      // are non-reference frames, so use large/max value for max_copied_frame.

+      if (cpi->svc.number_temporal_layers > 1 &&

+          cpi->svc.temporal_layer_id == cpi->svc.number_temporal_layers - 1)

+        cpi->max_copied_frame = 255;

     }

+  }

+  if (speed >= 8) {

+    sf->adaptive_rd_thresh = 4;

+    if (!cpi->use_svc) cpi->max_copied_frame = 4;

     if (cpi->row_mt && cpi->oxcf.max_threads > 1)

       sf->adaptive_rd_thresh_row_mt = 1;