tree 485bbd2706ed68e60a5c375473b1ee2c6fc03505
parent 8ba8bfea3f855979ec4260f16d07ed0fdfba7d37
author Ravi Chaudhary <ravi.chaudhary@ittiam.com> 1585806744 +0530
committer Yunqing Wang <yunqingwang@google.com> 1586205478 +0000

Optimize PC_TREE for lower resolution contents

For lower resolution contents, width or height <= 480,
sb_size is set as 64x64 instead of 128x128. PC_TREE for
these resolutions is allocated accordingly.

Observed memory footprint reduction with similar
encoding time.

Resolution    Tile     Memory reduction
                       Single   Multi
                       Thread   Thread
640x360       2x1      ~7%      ~17% (2 threads)
832x480       2x1      ~5%      ~11% (2 threads)

Memory measuring command:
$ command time -v ./aomenc ...

Change-Id: I217f6add0eadfcc24e46aac27ec2e7651f9e83f5