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Hui Su authored
This patch added two features to improve entropy coding efficiency for coefficient tokens. 1. Choose 1 of 4 default probability tables based on q-index for key-frames. It is ported from nextgen branch: https://chromium-review.googlesource.com/#/c/280586/ 2. Do backward update after each superblock (64X64) row using subframe token counts. Coding gain: 0.1% on lowres; 0.42% on midres; 0.36% on hdres. Much larger gain for key-frames: 2.6%, 2.3%, 1.7%. Design doc: go/huisu-entropy Change-Id: Ia3b6a615636be09247d70e4c520405637561532b
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