commit 77fb5be1bd59b7e9016cc6e5f829fd1f34ed4765
author Zoe Liu <zoeliu@google.com> Thu Nov 02 14:36:19 2017 -0700
committer Zoe Liu <zoeliu@google.com> Sat Nov 04 05:27:55 2017 +0000
tree 3147db6b61ec6f76dd44448034ca46441c73b0fd
parent e17ebe920c2ae5f6fdf5dde7b495912b5269dac0

Speed up one-sided compound mode (ext-comp-refs)

One-sided compound ref prediction is used only when all reference
frames are one-sided.

This patch has demonstrated an encoder speedup of ~28%.

Using the following configure setups, the coding performance has been
dropped on Google test sets (50 frames) in BDRate by ~0.2% for lowres
and by ~0.1% for midres (Corresponding performance impact should be
smaller on AWCY):
--enable-experimental --disable-convolve-round --disable-ext-partition
--disable-ext-partition-types --disable-txk-sel --disable-txm

Change-Id: I585bbffb2f8d154e8f52a1e79a84eff8bb4a471d

av1/encoder/rdopt.c

diff --git a/av1/encoder/rdopt.c b/av1/encoder/rdopt.c
index 17b3f6f..e3520ad 100644
--- a/av1/encoder/rdopt.c
+++ b/av1/encoder/rdopt.c
@@ -9985,7 +9985,22 @@
         if (cm->cur_frame->lst2_frame_offset <= cm->cur_frame->gld_frame_offset)
           continue;
     }
-#endif
+
+    // One-sided compound is used only when all reference frames are one-sided.
+    if (sf->selective_ref_frame && comp_pred && !cpi->all_one_sided_refs) {
+      unsigned int ref_offsets[2];
+      for (i = 0; i < 2; ++i) {
+        const int buf_idx = cm->frame_refs[mbmi->ref_frame[i] - LAST_FRAME].idx;
+        assert(buf_idx >= 0);
+        ref_offsets[i] = cm->buffer_pool->frame_bufs[buf_idx].cur_frame_offset;
+      }
+      if ((ref_offsets[0] <= cm->frame_offset &&
+           ref_offsets[1] <= cm->frame_offset) ||
+          (ref_offsets[0] > cm->frame_offset &&
+           ref_offsets[1] > cm->frame_offset))
+        continue;
+    }
+#endif  // CONFIG_FRAME_MARKER
 
     if (ref_frame == INTRA_FRAME) {
       RD_STATS rd_stats_y;