Adding rate_hist.{h, c} files.

Change-Id: Iaa28af6b25ec8982966a7296a073d6017b3a7f96

Change-Id: If446225afbb49f6033c2a4516a37c377de6f70f7

Change-Id: Ic2ff6405f01fd43d07c5ee3b5e374909401115cc

Includes a few fixes and clean-ups that adds the ability
to use alt-ref frames in one-pass mode.
Whether alt-refs are actually used or not is controlled by a
macro USE_ALTREF_FOR_ONE_PASS in vp9_firstpass.c.

This first cut seems to improve derf by 15+% in 1-pass mode.
But further experiments with parameters are underway.

Change-Id: I78254421435478003367c788c7930d2dc4ee2816

Change-Id: Idd1acfcf8bb16a2ddb9c6c1c841a7741e90589d9

Change-Id: Ib3747c81db8cc89b5d7012db557411a3b49712aa

Trap divide by 0 that could occur with a 0 rate target
in aq mode COMPLEXITY_AQ.

Change-Id: I034514f512b2a0db470ae8d37ea395278bf473cf

Added macros to reduce the code duplication.

Change-Id: I1916aa5a386ea07d961d4ec439ab09bb8c45487d

OUTPUT_FMT_C_HEADER

Change-Id: Ic1a583352ead8268efc39f1b89257e9c622e1613

Change-Id: Ia8fa3961eec34545465018281dc022bc6f73869a

It seems we don't use it and not going to.

Change-Id: Ie76cd04dafc79b0a5911f8957d4253ca2d787f0c

Fix of https://code.google.com/p/webm/issues/detail?id=698 issue.

Change-Id: I7a92d91481dbbae28d8953f146e9faafdcd7a310

It is enough to specify (e.g.) idct16, it is obviously different from
idct16x16.

Change-Id: I6b408a37a945de3162429380b59a775b03b95db0

which is 7.8 times faster than C.

Change-Id: I858ef4ec09202a07d445da8db702783d6d9d7321

Change-Id: I8d17867a4772554cbba2bd113cc5b4c99d50146d

Change-Id: I374a0c4bb4a66c0d3dc874c6e57fdee9d1ab72df

This is required by webrtc.

Change-Id: I32983597eb0f6797aeb0d93b65d8911989ba98ea

Change-Id: I832cf83871044bfee7b7e57dbd31bae05cbd53e9

Adds a stand-alone resize_util app for testing. The app
will not be built in the shared library configurations
so as not to require the APIs to be exposed.

Change-Id: I4718c8bff1abf4e57c2ab2d84be8738fc0048200

Adds multiple filters in the 0.5-1.0 range in the last stage
of the resize functions to prevent over-smoothing/aliasing

Change-Id: I1a615adb16f0df5095790945c94b28b4d6a6fc48

Change-Id: I31373ad860eb554eb3b03e877e8fba580dc3de07