commit 43acafdee2cc90a837dcad2f5e402ae3abe5cb4e
author Nathan E. Egge <negge@mozilla.com> Sun Mar 06 13:41:53 2016 -0500
committer Yaowu Xu <yaowu@google.com> Fri Oct 14 14:59:27 2016 -0700
tree 234b234899cf4a9f8e91dd4abc5cd66026d4f836
parent 0435f0eae6ec8470a146ceea799a4b770b192895

Use Daala entropy coder to code trees.

When building with --enable-daala_ec, calls to aom_write_tree() and
 aom_read_tree() will convert a aom_tree_index structure with associated
 aom_prob probabilities into a CDF on the fly for use with the
 od_ec_encode_cdf_q15().
The number of symbols in the CDF is capped at 16, and trees that contain
 more than 16 leaf nodes are handled by splitting the most likely, e.g.,
 highest probability symbols, first and coding multiple symbols if
 necessary.

ntt-short-1:

         MEDIUM (%) HIGH (%)
    PSNR 0.000227   0.000213
 PSNRHVS 0.000215   0.000205
    SSIM 0.000229   0.000209
FASTSSIM 0.000229   0.000214

subset1:

          RATE (%)  DSNR (dB)
    PSNR -0.00026   0.00002
 PSNRHVS -0.00026   0.00002
    SSIM -0.00026   0.00001
FASTSSIM -0.00026   0.00001

Change-Id: Icb1a8cb854fd81fdd88fbe4bc6761c7eb4757dfe