Improve low-latency (uni-directional) compound mode (non-normative)
(1) This patch will allow compound predictions from the same
reference;
(2) The code from this patch only takes effect when the sign bias
values of the two references are allowed to be identical;
(3) A further effort will be taken to combine this effort with
compound-singleref to finalize a new coding tool for the
single reference, compound prediction mode.
Change-Id: I682d9e00c849b02dff76577b2c581e1c1b97770b
diff --git a/av1/encoder/rdopt.c b/av1/encoder/rdopt.c
index 5c60f72..58dacde 100644
--- a/av1/encoder/rdopt.c
+++ b/av1/encoder/rdopt.c
@@ -10080,6 +10080,17 @@
// This is only used in motion vector unit test.
if (cpi->oxcf.motion_vector_unit_test && ref_frame == INTRA_FRAME) continue;
+#if CONFIG_LOWDELAY_COMPOUND // Changes LL bitstream
+#if CONFIG_EXT_REFS
+ if (cpi->oxcf.pass == 0) {
+ // Complexity-compression trade-offs
+ // if (ref_frame == ALTREF_FRAME) continue;
+ // if (ref_frame == BWDREF_FRAME) continue;
+ if (second_ref_frame == ALTREF_FRAME) continue;
+ // if (second_ref_frame == BWDREF_FRAME) continue;
+ }
+#endif
+#endif
comp_pred = second_ref_frame > INTRA_FRAME;
if (comp_pred) {
if (!cpi->allow_comp_inter_inter) continue;
@@ -11809,6 +11820,17 @@
// This is only used in motion vector unit test.
if (cpi->oxcf.motion_vector_unit_test && ref_frame == INTRA_FRAME) continue;
+#if CONFIG_LOWDELAY_COMPOUND // Changes LL bitstream
+#if CONFIG_EXT_REFS
+ if (cpi->oxcf.pass == 0) {
+ // Complexity-compression trade-offs
+ // if (ref_frame == ALTREF_FRAME) continue;
+ // if (ref_frame == BWDREF_FRAME) continue;
+ if (second_ref_frame == ALTREF_FRAME) continue;
+ // if (second_ref_frame == BWDREF_FRAME) continue;
+ }
+#endif
+#endif
comp_pred = second_ref_frame > INTRA_FRAME;
if (comp_pred) {
if (!cpi->allow_comp_inter_inter) continue;
