Explicilty use the transform block size to determine the coeff
band array. Remove the assumption on square transform block size.

Change-Id: I18e285130465a5eced49304a27a6cb617e297760

Map the rectangular transform block size into the bigger square
transform block size as the context for level map probability
model.

Change-Id: I20cf2b16daec16172855a78a201b670ff0547bf5

This function pre-generate counts/magnitudes of each level map
such that we don't have to re-calculate the counts/magnitudes
while doing the optimization.

Change-Id: Ifdfc89522cf2f2b9f3734d451324081f42b47cb0

BUG=aomedia:443

Change-Id: Iebdb609564c2c3040f3902052afeeec7ae83412d

This will separate the transform kernel selection from lv_map
experiment such that we can evaluate each feature's performance
separately

Note that txk_sel is build on top of lv_map

Change-Id: I5bd1ea99be30000efcdc2bcd42de002b78b1c3c8

This is for lv_map experiment

Change-Id: Ie000f7850efac32ffb46b9a4679cff2814c6246a

Change-Id: I3e9d9b3b59ee179b0fd24da2f0366ec841d2cfcf

The while loop may become infinite loop due to bitstream error.
Therefore, we add a breaking rule to avoid that.

Change-Id: I5bcda7dea846e280b59abc97c42baf334bca2603

Change-Id: I215c4bed9ba5c7f4fc93533249610217de14ce54

The feature is implemented in the following two functions.
av1_write_txb_probs
av1_read_txb_probs

Change-Id: I0b646e17ec54d7a10a77a6853439217091455af1

Change-Id: Id70fbfbca6c53a0aa15ff5606bb972e7412b3ed0

Change-Id: I45c8e26214cedb822ee5c38556ad03e3f2ad66a5

Change-Id: I3f059dc16124bbce2210296de5b884b5906ec182

Change-Id: Ifcdd3ce2953c1ecb1d0962da412a4b5ba2cda912

Change-Id: I222b5ce9ee1a1c1aac5620b94835967dd9a014c1