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/block.h b/av1/encoder/block.h
index 9ae6366..643861f 100644
--- a/av1/encoder/block.h
+++ b/av1/encoder/block.h
@@ -154,6 +154,10 @@
// cost in the first pass search.
int cb_partition_scan;
+ // If 0, do not allow corresponding ref frame during RD search.
+ uint8_t ref0_candidate_mask[REF_FRAMES + 1]; // The last entry is a counter.
+ uint8_t ref1_candidate_mask[REF_FRAMES];
+
// Activate constrained coding block partition search range.
int use_cb_search_range;
