commit 20497a52d305b7b98cc8d95546a9954a7b56b2e1
author Marco Paniconi <marpan@google.com> Fri Aug 26 08:59:36 2022 -0700
committer Marco Paniconi <marpan@google.com> Mon Aug 29 00:47:41 2022 -0700
tree 64fdc6493a69ad58a781719ad922cfe2af970cc3
parent 7c7f1fcc1dc7d5da5f2bb39283410e28a65ea0aa

rtc-svc: Modify speed feature for non-reference frames

For non-reference frames at speed >= 8:
-set subpel_search_method = SUBPEL_TREE_PRUNED_MORE
-enable disable_cdf_update_non_reference_frame
-set subpel reduction

And disable subpel reduction on base temporal layer.

This brings the speed-gap for 3TL AV1 vs VP9 closer
to the 1 layer speed-gap.

Stats changed
For speed 9 3TL (lm=2 pattern with 55-20-25 rate split):
rtc-derf: ~0.8% loss, ~2% speedup
rtc: ~0.7% loss, ~2% speedup

Change-Id: I74dd330af08d6f1d27cc264dcfe9aea4a12ee47c

av1/encoder/speed_features.c

diff --git a/av1/encoder/speed_features.c b/av1/encoder/speed_features.c
index 95340cc..c4bb054 100644
--- a/av1/encoder/speed_features.c
+++ b/av1/encoder/speed_features.c
@@ -1366,10 +1366,15 @@
       sf->mv_sf.search_method = NSTEP;
       sf->mv_sf.subpel_search_method = SUBPEL_TREE;
       sf->rt_sf.fullpel_search_step_param = 6;
+      sf->rt_sf.reduce_mv_pel_precision = 0;
     }
-    if (speed >= 9) {
+    if (speed >= 8) {
       sf->rt_sf.disable_cdf_update_non_reference_frame = true;
-      if (cpi->svc.non_reference_frame) sf->rt_sf.nonrd_agressive_skip = 1;
+      sf->rt_sf.reduce_mv_pel_precision = 2;
+      if (cpi->svc.non_reference_frame) {
+        sf->rt_sf.nonrd_agressive_skip = 1;
+        sf->mv_sf.subpel_search_method = SUBPEL_TREE_PRUNED_MORE;
+      }
     }
     if (cpi->svc.ref_frame_comp[0] || cpi->svc.ref_frame_comp[1] ||
         cpi->svc.ref_frame_comp[2]) {