New Motion Reference Search

Alternative strategy for finding a list of candidate motion
vectors to use as reference values in mv coding and as
nearest and near.

Sort by sad in vp8_find_best_ref_mvs() rather than just
pick the best. Allow 0,0 as a best ref option but not a
nearest or near unless there are no alternatives.

Encode/Decode verified on at least some clips.

Some commented out experimental and stats code still in place.

Gain over existing code averages about 1% on derf (alll metrics)
with improvement on all clips. Other test results pending.

The entropy coding of the mode (nearest/near etc) still
depends upon and requires the old "findnear" code so
this needs looking at and may provide room for further gains.

Change-Id: I871d7cba1d1c379c4bad9bcccce1fb19c46b8247

1 files changed, 10 insertions, 0 deletions

diff --git a/vp8/encoder/encodeframe.c b/vp8/encoder/encodeframe.c
index f834e0b83..6ade0aa78 100644
--- a/vp8/encoder/encodeframe.c
+++ b/vp8/encoder/encodeframe.c
@@ -34,6 +34,10 @@
 #include "vp8/common/pred_common.h"
 
 #define DBG_PRNT_SEGMAP 0
+#if CONFIG_NEW_MVREF
+#include "vp8/common/mvref_common.h"
+#endif
+
 
 #if CONFIG_RUNTIME_CPU_DETECT
 #define RTCD(x)     &cpi->common.rtcd.x
@@ -1301,6 +1305,12 @@ static void encode_frame_internal(VP8_COMP *cpi) {
   // this frame which may be updated with each iteration of the recode loop.
   compute_mod_refprobs(cm);
 
+#if CONFIG_NEW_MVREF
+  // temp stats reset
+  vp8_zero( cpi->mv_ref_sum_distance );
+  vp8_zero( cpi->best_ref_index_counts );
+#endif
+
 // debug output
 #if DBG_PRNT_SEGMAP
   {