Change to arf boost calculation.

In this commit I have added an experimental function
that tests prediction quality either side of a central position
to calculate a suggested boost number for an ARF frame.

The function is passed an offset from the current position and
a number of frames to search forwards and backwards.
It returns a forward, backward and compound boost number.

The new code can be deactivated using #define NEW_BOOST 0

In its current default state the code searches forwards and backwards
from the proposed  position of the next alt ref.

The the old code used a boost number calculated by scanning forward
from the previous GF up to the proposed alt ref frame position.

I have also added some code to try and prevent placement of a gf/arf
where there is a brief flash.

Change-Id: I98af789a5181148659f10dd5dd2ff2d4250cd51c

1 files changed, 2 insertions, 1 deletions

diff --git a/vp8/encoder/onyx_if.c b/vp8/encoder/onyx_if.c
index a6d7a4304..80f7ae67c 100644
--- a/vp8/encoder/onyx_if.c
+++ b/vp8/encoder/onyx_if.c
@@ -2012,7 +2012,8 @@ VP8_PTR vp8_create_compressor(VP8_CONFIG *oxcf)
         size_t packet_sz = sizeof(FIRSTPASS_STATS);
         int packets = oxcf->two_pass_stats_in.sz / packet_sz;
 
-        cpi->twopass.stats_in = oxcf->two_pass_stats_in.buf;
+        cpi->twopass.stats_in_start = oxcf->two_pass_stats_in.buf;
+        cpi->twopass.stats_in = cpi->twopass.stats_in_start;
         cpi->twopass.stats_in_end = (void*)((char *)cpi->twopass.stats_in
                             + (packets - 1) * packet_sz);
         vp8_init_second_pass(cpi);