Merge "bitstream: give exported symbols a vp9_ prefix; make local symbols static." into experimental

* changes:
  tokenize: make local symbols static; give exported symbols a vp9_ prefix.
  encodemb: make locally used functions static.

Change-Id: I3aa5b515c1eae19ae40ba9808d133590c95f7d13

Also include the correct header in ratectrl.c so it picks up these
function prototypes.

Change-Id: Ic51b13119f1625f0691917f2713b23d0249dece7

This way, the code is not compiled in by default, thus decreasing
overall binary size.

Change-Id: I85cac8f5a22a51a7d99c820ef6d6ed179d4106a0

Change-Id: Id55f3cd3c2f5857dbfd78703452740dfd63cdf41

Change-Id: I23aa5547b1e74f31327258dda0e330aae7ca1d35

Change-Id: I8341a19cb4f2234841a40fcbf560315f079b0108

Change-Id: Ica08c2c9cda9623389dde3f276dfed77c36e3a11

Also remove them from the header file.

Change-Id: I38182f70268fd47985fb1d8d87cdeb207f67e475

Change-Id: Id33c448084ca5c1c0525a05c3c4f35d6b0805fbe

Change-Id: I4f317f413fbbcc59f84ff77899ea208fb0dccb2a

Change-Id: I295c7bcf13b630cb9395585ede7311d85d785f25

Also merge some duplicate code related to the superblock experiment
in the RD loop.

Change-Id: Ic93f1d4d1ed81220fd7ecf6e65da2821a215b2de

Change-Id: I3b7bae440bba7ffb401c94fc7e338dbe75daa980

Two head files dct.h and dct_x86.h were removed in a previous commit,
this commit removed the build's dependency on the two files.

Change-Id: Idd33712470912d39d42f133dc30b710cab6fa832

Remove the fdct invoke macro calls

Change-Id: Ica2431c655819fa012133ee7abc75a16761e5fd6

Change-Id: Ic186269b51ffb3c344635bfa9825bed25be2c5ae

Preparation for project restructuring.
Added vp9_ prefix on some function names that have global scope.
Added static declaration on some that dont.

Change-Id: If072f78b4300e8c17cfeed82c5d17b59946dcc5e

Previously, in evaluating reference motion vectors, MVs are always
rounded to integer pixel position and SADs are calculated.  This
commit takes into account the subpixel portion of the mvs, and uses
bilinear interpolation to produce reference pixel values in subpixel
postions. In addition, SSE is used in place of SAD. Pixels used are
16x2 above and 2x16 to the left.

This commmit intends to test the potential of this line of work in
term of compression improvement, obviously, the change would increase
decoder complexity significantly.

Test results
std-hd: 1.738%(avg) 1.779%(glb), 1.663%(ssim)
derf: 0.472%(avg) 0.477%(glb), 0.418%(ssim)

Change-Id: I3ae1b098f6289df78891134d9a5e4bb2fde87a0b

Cleaned up some inconsistent references using both xd-> and
x->e_mbd. to access the same data structure in the same function.

Change-Id: Ieb496fa22bf1feec6aa7bc70b941ea4f16e0f8b5

Change-Id: I321280abcf48f3dc16e194d29bde2bd3baec6006

Change-Id: I0c689fb44e9e91539c450d26672d7a1d92e92900