shithub: libvpx

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ref: 2bbde25003f5f67e2d60449712521890cadf7774
parent: a10a268e58ffd4366f6dbddd5f26600d688714c9
author: Yaowu Xu <yaowu@google.com>
date: Thu Aug 4 12:30:27 EDT 2011

make uv intra mode coding adaptive to Y mode

This commit tries to do UV intra mode coding adaptive to Y intra mode.
Entropy context is defined as conditional PDF of uv intra mode given
the Y mode. All constants are normalized with 256 to be fit in 8 bits.

This provides further coding efficiency beyond the quantizer adaptive
y intra mode coding. Consistent gains were observed on all clips and
all bit rates for HD all key encoding tests.

To test, configure with
--enable-experimental --enable-uvintra

Change-Id: I2d78d73f143127f063e19bd0bac3b68c418d756a