Fix rate control bug whereby the rate factor heuristics
were being updated on arf overlays causing a rate surge
for a few frames followed by a corrective drop.

This fix eliminates many of the overshoot problems that
we were seeing on hard clips (even without applying
stricter vbr rate control) and also helps quality on
almost all clips with some hard clips improving by >5%.

Overall quality results measured at speed 2.
Derf  +1.78% opsnr , +2.44% SSIM
Stdhd +2.41% opsnr, +2.85% SSIM

Change-Id: I2369df6295c2705963fa6307877f6acb304bcc39

Change-Id: I87819fed5aebb6ffe2f4d4655df226235a3d21cb

Change-Id: I988eea8f78f71135b914661420c5c75674e5c010

Change-Id: Id687aa617650a859463e7ae63dd4c0dc4f3e4779

Change-Id: I5ed360585dae2c9fea6c32058dbfb8ec07700677

Remove call to fatal() in webmdec.c so that it does not depend on
tools_common.c for compilation.

Change-Id: I3eec483afe6fae72436993c72b26d61d14a7f2bf

Change-Id: I257fb32673c47848258dc7e6e22147d0beb49f86

Change-Id: I35b9d1856d7951b8df7c933df6936dfc52a28451

We don't use declarations from this file. The real declarations
(differently named) are in vp9_rtcd_defs.pl, e.g. vp9_full_search_sad.

Change-Id: I73cbf064305710ba20747233cfdbe67366f069a0

Change-Id: I6ea1c335da9ca5b65f6a11466b417ad196fd0d65

Added command line flags "resize-width" & "resize-height"
to allow the user to specify the frame size to encode at.

These two flags are ignored if the "resize-allowed" switch
is not set to 1.

All frames in the clip are then encoded at this size, which
must be smaller than the raw frame size.

Change-Id: I3d64bd9303d5c0bd678461a866a1ea621700d744

This prefix reserved for global scope functions etc.

Change-Id: I671cda2a63e01a40aae3d7407dd1bb4d338d709c

A previous path improved speed 2 quality a little but
more extensive testing showed that it slowed encode
by a few %.

The change will have a similar effect for speed 3 but
should not impact speeds 4+;

This experiment should reverse that and give a speed
up at the cost of a small quality loss.

Borg results pending.

Change-Id: I4493fc1541aaf44587f1a41ff219f7088da9252c

vp9/encoder/vp9_rdopt.c:3913:44: runtime error: index -1 out of bounds for
type 'RefBuffer [3]'.

Change-Id: Ic0ec755328853b359e3a1ee84d319589183e38b7

Both values are already checked as command line arguments:
RANGE_CHECK_HI(cfg, g_lag_in_frames, MAX_LAG_BUFFERS);
RANGE_CHECK_HI(extra_cfg, sharpness, 7);

Change-Id: I584798d587152d88dfd517c210054b466f4e5f8a

Change-Id: I258351fc1fff70ff2e9fa4845e575b0bb6a423d1