shithub: libvpx

Download patch

ref: ccba289f8d1760a45b972685a64eb829529b70ab
parent: 5556d1184169168e59656863456c88c3f958ca45
author: Jingning Han <jingning@google.com>
date: Thu May 29 14:14:17 EDT 2014

Fast computation path for forward transform and quantization

This commit enables a fast path computational flow for forward
transformation. It checks the sse and variance of prediction
residuals and decides if the quantized coefficients are all
zero, dc only, or more. It then selects the corresponding coding
path in the forward transformation and quantization stage.

It is currently enabled in rtc coding mode. Will do it for rd
coding mode next.

In speed -6, the runtime for pedestrian_area 1080p at 1000 kbps
goes down from 14234 ms to 13704 ms, i.e., about 4% speed-up.
Overall coding performance for rtc set is changed by -0.18%.

Change-Id: I0452da1786d59bc8bcbe0a35fdae9f623d1d44e1