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Skip the partition search for still frames

This patch re-enabled the feature in Pengchong's patch
(commit 12861260732a4fd5f6b667ce9d5105dc9b606eda). Originally, it
was turned on while use_lastframe_partitioning > 0(not used anymore).
Now it was added as a feature, and turned on while speed >= 2.
As described in the original patch, this feature helps speed up the
slideshows in YouTube.

Change-Id: I1b0f18d65da1ee1c8d1e117dabba910c5207c471

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

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

@@ -2490,7 +2490,7 @@

                              sf->always_this_block_size);

       rd_use_partition(cpi, tile, mi, tp, mi_row, mi_col, BLOCK_64X64,

                        &dummy_rate, &dummy_dist, 1, cpi->pc_root);

-    } else if ((sf->use_lastframe_partitioning && cpi->skippable_frame) ||

+    } else if (cpi->partition_search_skippable_frame ||

                sf->partition_search_type == VAR_BASED_FIXED_PARTITION) {

       BLOCK_SIZE bsize;

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

--- a/vp9/encoder/vp9_encoder.c

+++ b/vp9/encoder/vp9_encoder.c

@@ -772,7 +772,7 @@

   vp9_rc_init(&cpi->oxcf, oxcf->pass, &cpi->rc);

   cm->current_video_frame = 0;

-  cpi->skippable_frame = 0;

+  cpi->partition_search_skippable_frame = 0;

   // Create the encoder segmentation map and set all entries to 0

   CHECK_MEM_ERROR(cm, cpi->segmentation_map,

@@ -2203,9 +2203,9 @@

   // Check if the current frame is skippable for the partition search in the

   // second pass according to the first pass stats

-  if (oxcf->pass == 2 &&

+  if (cpi->sf.allow_partition_search_skip && oxcf->pass == 2 &&

       (!cpi->use_svc || is_two_pass_svc(cpi))) {

-    cpi->skippable_frame = is_skippable_frame(cpi);

+    cpi->partition_search_skippable_frame = is_skippable_frame(cpi);

   }

   // For 1 pass CBR, check if we are dropping this frame.

--- a/vp9/encoder/vp9_encoder.h

+++ b/vp9/encoder/vp9_encoder.h

@@ -241,7 +241,8 @@

   YV12_BUFFER_CONFIG *unscaled_last_source;

   YV12_BUFFER_CONFIG scaled_last_source;

-  int skippable_frame;

+  // For a still frame, this flag is set to 1 to skip partition search.

+  int partition_search_skippable_frame;

   int scaled_ref_idx[3];

   int lst_fb_idx;

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

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

@@ -88,6 +88,8 @@

     else

       sf->partition_search_breakout_dist_thr = (1 << 22);

     sf->partition_search_breakout_rate_thr = 700;

+

+    sf->allow_partition_search_skip = 1;

   }

   if (speed >= 3) {

@@ -365,6 +367,7 @@

   sf->max_delta_qindex = 0;

   sf->disable_filter_search_var_thresh = 0;

   sf->adaptive_interp_filter_search = 0;

+  sf->allow_partition_search_skip = 0;

   for (i = 0; i < TX_SIZES; i++) {

     sf->intra_y_mode_mask[i] = INTRA_ALL;

--- a/vp9/encoder/vp9_speed_features.h

+++ b/vp9/encoder/vp9_speed_features.h

@@ -435,6 +435,9 @@

   // Partition search early breakout thresholds.

   int64_t partition_search_breakout_dist_thr;

   int partition_search_breakout_rate_thr;

+

+  // Allow skipping partition search for still image frame

+  int allow_partition_search_skip;

 } SPEED_FEATURES;

 struct VP9_COMP;