vp9: Encoding cycle reduction for speed 8.

1. Skip golden non-zeromv and newmv-last for bsize >= 16x16 if the
temporal variance obtained from choose_partitioning is very low.
2. Skip horz and vert INTRA mode for speed 8.

This change works best on the clips with little noise and with some
motion (e.g. gips_motion which has > 5% speed up). PSNR drop is 1.78%
on rtc test set, no obvious visual quality regression found.

Change-Id: Ib43b5b20e67809d03c5a6890818ddff59e1fc94a

1 files changed, 12 insertions, 1 deletions

diff --git a/vp9/encoder/vp9_speed_features.c b/vp9/encoder/vp9_speed_features.c
index 0090b4f40..e7f04a244 100644
--- a/vp9/encoder/vp9_speed_features.c
+++ b/vp9/encoder/vp9_speed_features.c
@@ -429,7 +429,7 @@ static void set_rt_speed_feature(VP9_COMP *cpi, SPEED_FEATURES *sf,
     sf->mv.search_method = NSTEP;
     sf->mv.reduce_first_step_size = 1;
     sf->skip_encode_sb = 0;
-    if (!cpi->use_svc && cpi->oxcf.rc_mode == VPX_CBR && cpi->oxcf.pass == 0 &&
+    if (!cpi->use_svc && cpi->oxcf.rc_mode == VPX_CBR &&
         content != VP9E_CONTENT_SCREEN) {
       // Enable short circuit for low temporal variance.
       sf->short_circuit_low_temp_var = 1;
@@ -450,6 +450,17 @@ static void set_rt_speed_feature(VP9_COMP *cpi, SPEED_FEATURES *sf,
     sf->adaptive_rd_thresh = 4;
     sf->mv.subpel_force_stop = (content == VP9E_CONTENT_SCREEN) ? 3 : 2;
     sf->lpf_pick = LPF_PICK_MINIMAL_LPF;
+    // Only keep INTRA_DC mode for speed 8.
+    if (!is_keyframe) {
+      int i = 0;
+      for (i = 0; i < BLOCK_SIZES; ++i)
+        sf->intra_y_mode_bsize_mask[i] = INTRA_DC;
+    }
+    if (!cpi->use_svc && cpi->oxcf.rc_mode == VPX_CBR &&
+        content != VP9E_CONTENT_SCREEN) {
+      // More aggressive short circuit for speed 8.
+      sf->short_circuit_low_temp_var = 2;
+    }
   }
 }