Add a speed feature to limit ref frame search
Limit the ref frame candidates to those picked during the initial
partition search(the adaptive_txb_search speed feature).
Compression quality impact is neutral.
Encoding speed improvement on top of speed 1(30 frames):
QP=20 QP=40
akiyo_cif: 15% 22%
cheer_cif: 2% 1%
city_cif: 10% 14%
coastguard_cif: 8% 16%
container_cif: 6.5% 17.5%
crew_cif: 8.5% 11.5%
AVERAGE: 8.4% 13.8%
Enabled for speed 1 and above.
STATS_CHANGED
Change-Id: I5f43fb7c4e9932240f8d163bad663e8249952fa3
diff --git a/av1/encoder/speed_features.h b/av1/encoder/speed_features.h
index d6edab9..4e38709 100644
--- a/av1/encoder/speed_features.h
+++ b/av1/encoder/speed_features.h
@@ -383,6 +383,10 @@
// 2-pass coding block partition search
int two_pass_partition_search;
+ // Use the mode decisions made in the initial partition search to prune mode
+ // candidates, e.g. ref frames.
+ int mode_pruning_based_on_two_pass_partition_search;
+
// Skip rectangular partition test when partition type none gives better
// rd than partition type split.
int less_rectangular_check;
