tree c3c888fec628eb21bbda657cf2446ffdeb4790c2
parent 5a2e54915c6bb4195fcf05e4cf5663338338d4dc
author Cheng Chen <chengchen@google.com> 1606782517 -0800
committer Cheng Chen <chengchen@google.com> 1607040903 +0000

Allow first pass to encode with other square block sizes

Traditionally, block size of 16x16 is hard coded for the first pass
encoding.

Here we make a few changes to remove the hard coded constraint and
allow other square block sizes: 4x4, 8x8, 16x16.

Changes include:
* Remove macro of 16x16 block size
* Add a variable of first pass block size to cpi, so that multi thread
  is aware of unit size.
* Add auxiliary functions to get size info, and let block size be
  input variable so that various block sizes can be supported.
* Other miscellaneous changes to make this work.

Change-Id: I302aa805736d3c6c26273ac064ef94247b16c364