Merge "Add back vp9_short_idct32x32_1_add_neon which is deleted in cleanup I63df79a13cf62aa2c9360a7a26933c100f9ebda3."

This patch fixed the issue reported in "Issue 655: remove textrel's
from 32-bit vp9 encoder". The set of vp9_subpel_variance functions
that used x86inc.asm ABI didn't build correctly for 32bit PIC. The
fix was carefully done under the situation that there was not
enough registers.

After the change, we got
$ eu-findtextrel libvpx.so
eu-findtextrel: no text relocations reported in 'libvpx.so'

Change-Id: I1b176311dedaf48eaee0a1e777588043c97cea82

The term x represents macroblock pointer across encode_block. Change
the two local variable names to avoid confusion.

Change-Id: Ic732e73023525d673c0a678ed2708ac1edf5a3f9

Change-Id: I6e4a266fdbad1d222eb45d45b67bbb82d091821a

Now tile decoding consists of two stages:
1. Find tile buffer start and its size, put this info into tile_buffers.
2. Decode each tile based on information from tile_buffers.

It seems that stage 1 can also be reused by multithreaded tile decoder.

Change-Id: If0cdaefdd6d10bb41c63561346c9ae4cfac081dd

It is more logical to use dqcoeff buffer to put there *dequantized*
transform coefficients (inside inverse_transform_block and
decode_coefs functions). Dequantization happens inside WRITE_COEF_CONTINUE
macro.

qcoeff buffer should be only used in the encoder for *quantized*
transform coefficients.

Change-Id: Ifd54bef272bbf5311ced6669c4f1079f998af5d7

SVC multiple layer per frame encoding is invoked with vpx_svc_init and
vpx_svc_encode. These interfaces are designed to be invoked from ffmpeg.
Additional improvements:
- make dummy frame handling a bit more explicit
- fixed bug with single layer encodes
- track individual frame sizes and psnrs instead of averages
- parameterized quantizer, 16th scalefactors, more logging,
- enabled single layer encodes to generate baseline
- include new mode for 3 layer I frame with 5 total layers

Change-Id: I46cfa600d102e208c6af8acd6132e0cc25cda8d4

Change-Id: I04c55daef89bca2b85cb7db0850f9b052abc5a7c

Change-Id: I19c482c7cba34db574b3f33178ba20aede49779e

Change-Id: Ifb40757c9c6b353482cfeef929af282ee0136c6c

Removes stack-allocation of token_cache in the tokenize
function in the encoder.

Change-Id: Ifdbab76dc2b23384da0080d2e9390533e489db8c

I'm sure I could do more, but I don't know how long this code has to
live. I think this at least makes the code a little easier to read and
understand.

Change-Id: I6ca76357f89468d4851a3d1826e7aefa498e51d1

This is mainly a clean up patchset. It moves the WebM writing support
out of vpxenc and into its own source file. Changes to tools_common and
vpxdec result from relocation of shared bits of code.

Change-Id: Iee55d3285f56e0a548f791094fb14c5ac5346a26

Error in script means vp9_h_predictor_32x32 sse3 version
is not enabled.

Change-Id: Ia43672740da1ecdfb7fcd420490ef424b04accc4

Change-Id: I1c0c1b92aab33b1e4321b8e584a934fe58e0b324

cleanup I63df79a13cf62aa2c9360a7a26933c100f9ebda3.

Change-Id: I034848cf05031618818f7df2e7f9c35102686948

Changes to reduce branching in detokenization  in order
to improve decode speed.

Change-Id: I23a74d072cc14d99f6fc054c1e6a72021e777903

Removes stack-alocation of token_cache in decode_coefs function

Seems to achieve about 1% decode speed improvement as tested on
25 480p videos.

Change-Id: I8e7eb3361fa09d9654dfad0677a6d606701fdc6e

The compound inter prediction could potentially run with initial
motion vectors of invalid value and check the mv_cost, which triggers
overheap read. This commit resolves this issue by forcing a motion
vector value check for compound inter modes of both superblock and
sub8x8 block sizes.

Change-Id: I4f4fc19ce83c8272782bc382f12c82a3f03212fc