commit 68ad7a6e20425c60bb4a98428454f6e2db5c0d2f
author Zoe Liu <zoeliu@google.com> Wed Feb 08 10:35:36 2017 -0800
committer Zoe Liu <zoeliu@google.com> Thu Jul 20 00:56:47 2017 +0000
tree 324a705545f58e26561b435086490167ac930978
parent 11934b08ef054125f2b926cc2989d23273b21aeb

Add a new experiment "altref2"

This experiment is to add ALTREF2_FRAME to allow 2 altref backward
predictions. Each video frame will then have up to 7 reference frames
to choose from:

(1) 4 forward predictive references, namely
LAST_FRAME, LAST2_FRAME, LAST3_FRAME, and GOLDEN_FRAME; and
(2) 3 backward predictive references, namely
BWDREF_FRAME, ALTREF2_FRAME, and ALTREF_FRAME.

The tool of "altref2" is built on top of the "ext_refs" experiment.

Change-Id: Idbb0bb53b43c5c2c7baf4959331fc5a31c77a118

configure

diff --git a/configure b/configure
index aa58e3b..abee043 100755
--- a/configure
+++ b/configure
@@ -266,6 +266,7 @@
     wedge
     compound_segment
     ext_refs
+    altref2
     speed_refs
     gf_groups
     global_motion
@@ -549,6 +550,7 @@
     enabled bgsprite && enable_feature global_motion
     enabled ext_comp_refs && enable_feature var_refs
     enabled ext_comp_refs && disable_feature one_sided_compound
+    enabled altref2 && enable_feature ext_refs
 
     if ! enabled delta_q && enabled ext_delta_q; then
       log_echo "ext_delta_q requires delta_q, so disabling ext_delta_q"