Modified prediction behavior for reference frame.

Trial of a modified prediction function that ranks each possible
reference frame based on a combination of local usage and
frame level probability. The code is a bit cleaner and simpler.

In direct comparison with old unpredicted method with segment level
coding turned off for mode,ref & EOB the prediction gives a gain on derf
of around 0.4%. There is some further gain from bug fixes over earlier code.

With segment coding on the prediction method is slightly -ve on some very
easy clips (at low rates) due to slightly higher overheads, but better on harder
clips. Overall neutral on derf in direct comparison on latest code base, but
compared to earlier code without bug fixes about +0.7% overall psnr
+0.3% SSIM.

Change-Id: I5b8474658b208134d352d24f6517f25795490789

1 files changed, 0 insertions, 1 deletions

diff --git a/vp8/decoder/decodemv.c b/vp8/decoder/decodemv.c
index 432b339b1..4238e4d18 100644
--- a/vp8/decoder/decodemv.c
+++ b/vp8/decoder/decodemv.c
@@ -292,7 +292,6 @@ static MV_REFERENCE_FRAME read_ref_frame( VP8D_COMP *pbi,
         // else decode the explicitly coded value
         else
         {
-            //vp8_prob * mod_refprobs = cm->mod_refprobs[pred_ref];
             vp8_prob mod_refprobs[PREDICTION_PROBS];
             vpx_memcpy( mod_refprobs,
                         cm->mod_refprobs[pred_ref], sizeof(mod_refprobs) );