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Revert "vp9: Enable ml based partition for speed>=8 low res."

This reverts commit eed8d47769ddc78c277f8a45b12af4b65096b59a.

BUG=chromium:946409

Change-Id: Iaf9929de841445f63e93792d1fee06d9a1035ef4

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

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

@@ -569,6 +569,14 @@

         (frames_since_key % (sf->last_partitioning_redo_frequency << 1) == 1);

     sf->max_delta_qindex = is_keyframe ? 20 : 15;

     sf->partition_search_type = REFERENCE_PARTITION;

+    if (sf->nonrd_use_ml_partition) {

+      if (!frame_is_intra_only(cm) && cm->width >= 360 && cm->height >= 360)

+        sf->partition_search_type = ML_BASED_PARTITION;

+#if CONFIG_VP9_HIGHBITDEPTH

+      if (cpi->Source->flags & YV12_FLAG_HIGHBITDEPTH)

+        sf->partition_search_type = REFERENCE_PARTITION;

+#endif  // CONFIG_VP9_HIGHBITDEPTH

+    }

     if (cpi->oxcf.rc_mode == VPX_VBR && cpi->oxcf.lag_in_frames > 0 &&

         cpi->rc.is_src_frame_alt_ref) {

       sf->partition_search_type = VAR_BASED_PARTITION;

@@ -633,7 +641,10 @@

       sf->use_altref_onepass = 1;

       sf->use_compound_nonrd_pickmode = 1;

     }

-    sf->partition_search_type = VAR_BASED_PARTITION;

+

+    if (!sf->nonrd_use_ml_partition)

+      sf->partition_search_type = VAR_BASED_PARTITION;

+

     sf->mv.search_method = NSTEP;

     sf->mv.reduce_first_step_size = 1;

     sf->skip_encode_sb = 0;

@@ -721,10 +732,6 @@

     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;

-    // Enable ML based partition for low res.

-    if (!frame_is_intra_only(cm) && cm->width * cm->height <= 352 * 288) {

-      sf->nonrd_use_ml_partition = 1;

-    }

     if (content == VP9E_CONTENT_SCREEN) sf->mv.subpel_force_stop = HALF_PEL;

     // Only keep INTRA_DC mode for speed 8.

     if (!is_keyframe) {

@@ -770,9 +777,6 @@

     if (cpi->rc.avg_frame_low_motion < 70) sf->default_interp_filter = BILINEAR;

     if (cm->width * cm->height >= 640 * 360) sf->variance_part_thresh_mult = 2;

   }

-

-  if (sf->nonrd_use_ml_partition)

-    sf->partition_search_type = ML_BASED_PARTITION;

   if (sf->use_altref_onepass) {

     if (cpi->rc.is_src_frame_alt_ref && cm->frame_type != KEY_FRAME) {