In sub-pixel motion search, the search range is small(+/- 3 pixels).
Preload whole search area from reference buffer into a 32-byte
aligned buffer. Then in search, load reference data from this buffer
instead. This keeps data in cache, and reduces the crossing cache-
line penalty. For tulip clip, tests on Intel Core2 Quad machine(linux)
showed encoder speed improvement:
  3.4%   at --rt --cpu-used =-4
  2.8%   at --rt --cpu-used =-3
  2.3%   at --rt --cpu-used =-2
  2.2%   at --rt --cpu-used =-1

Test on Atom notebook showed only 1.1% speed improvement(speed=-4).
Test on Xeon machine also showed less improvement, since unaligned
data access latency is greatly reduced in newer cores.

Next, I will apply similar idea to other 2 sub-pixel search functions
for encoding speed > 4.

Make this change exclusively for x86 platforms.

Change-Id: Ia7bb9f56169eac0f01009fe2b2f2ab5b61d2eb2f

This patch attempts to improve the handling of CBR streams with
respect to the short term buffering requirements. The "buffer level"
is changed to be an average over the rc buffer, rather than a long
running average. Overshoot is also tracked over the same interval
and the golden frame targets suppressed accordingly to correct for
overly aggressive boosting.

Testing shows that this is fairly consistently positive in one
metric or another -- some clips that show significant decreases
in quality have better buffering characteristics, others show
improvenents in both.

Change-Id: I924c89aa9bdb210271f2e03311e63de3f1f8f920

Using small values for --buf-sz= in command line causes
floating point exception due to division by zero.

Change-Id: Ibfe2d44db922993a78ebc9a4a1087d9625de48ae

Optimized C-code of the following functions:
 - vp8_tokenize_mb
 - tokenize1st_order_b
 - tokenize2nd_order_b
Gives ~1-5% speed-up for RT encoding on Cortex-A8/A9
depending on encoding parameters.

Change-Id: I6be86104a589a06dcbc9ed3318e8bf264ef4176c

vpx_copy_and_extend_frame could incorrectly
resize uv frames which could result in a crash.

Change-Id: Ie96f7078b1e328b3907a06eebeee44ca39a2e898

min_fs_radius, max_fs_radius, full_freq were set but never read.

Change-Id: I82657f4e7f2ba2acc3cbc3faa5ec0de5b9c6ec74

glibc implements some checking on longjmp() calls by replacing it with
an internal function __longjmp_chk(), when FORTIFY_SOURCE is defined.
This can be problematic when compiling the library under one version of
glibc and running it under another. Work around this issue for the one
symbol affected for now, before taking out the undef hammer.

Fixes http://code.google.com/p/webm/issues/detail?id=166

Change-Id: Ifc5e25cdec17915e394711f2185b3e9214572d10

Minor fix.

Change-Id: Iaf93f6e47e882a33c479e57c7a0d0bf321e291c0

Previously allocated more memory than necessary for yuv buffers.
This makes it harder to track bugs with reading uninitialized
data.

Change-Id: I510f7b298d3c647c869be6e5d51608becc63cce9

Code has not been used and is no longer relevant.

Change-Id: I38590513da7c7a436804ff8a1a3805d9697f575d

As reported in issue 331, vpxenc encoded incorrect webm file header
on big endian machines. This change fixed that.

Change-Id: I31924ebd476a87f3e88b9b5424540bf781d2b86f

Change-Id: I5fe581d797571a7a9432fbd17fc557591d0c1afa

Change-Id: I65105a9c63832669237e6a6a7fcb4ea3ea683346

Clamp mv search to accomodate subpixel filtering
of UV mv.

Change-Id: Iab3ed405993ef6bf779ad7cf60863153068fb7d1

Scott suggested to move vp8_mv_pred() under "case NEWMV" to save
extra checks.

Change-Id: I09e69892f34a08dd425a4d81cfcc83674e344a20

Do mvp clamping in full-pixel precision instead of 1/8-pixel
precision to avoid error caused by right shifting operation.
Also, further fixed the motion vector limit calculation in change:
b7480454

Change-Id: Ied88a4f7ddfb0476eb9f7afc6ceeddbf209fffd7

Change-Id: I1ed739522db7c00c189851c7095c1b64ef6412ce

Separate simple filter with reduced no. of parameters.
MB filter level picking based on precalculated table. Level table updated for
each frame. Inside and edge limits precalculated and updated just when
sharpness changes. HEV threshhold is constant.
ARM targets use scalars and others vectors.

Change works only with --target=generic-gnu
All other targets have to be updated!

Change-Id: I6b73aca6b525075b20129a371699b2561bd4d51c

Allow the encoder to inform the application that the encoded frame will not
be used as a reference.

Change-Id: I90e41962325ef73d44da03327deb340d6f7f4860

This should fix binaries using PIC on x86-32. Also should
fix issue 343.

Change-Id: I591de3ad68c8a8bb16054bd8f987a75b4e2bad02

Motion vector limits are calculated using right shifts, which
could give wrong results for negative numbers. James Berry's
test on one clip showed encoder produced some artifacts. This
change fixed that.

Change-Id: I035fc02280b10455b7f6eb388f7c2e33b796b018