tree 6b05567b793270c9794bfe2541dd9023859bb522
parent 02a6006ae2a7c03f175b3fe0a1c5defe04a8d055
author chiyotsai <chiyotsai@google.com> 1565291352 -0700
committer Chi Yo Tsai <chiyotsai@google.com> 1565655840 +0000

Release previous hash-me memory when encoding new frame

The hash-table from hash-me has two usages:
  - intrablock copy for keyframe
  - prune subpel search in interframe

The current usages only require the hash-table for the current and
previous coded frame be kept. But currently in the codebase, the
memory is only released when the frame buffers are refreshed.

This commit changes so that the hash-tables for frames other than
the current and previously coded frames are released, which allows
significant memory saving.

Performance when encoding 4k videos over 33 frames:
Baseline: 7.2 GB
 Commit : 3.1 GB
 Saving : 4.1 GB, or ~57% memory reduction

BUG=aomedia:2453

Change-Id: I659dbe5eb2d7badea7239a841fc5ba06987f75f7