shithub: libvpx

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ref: 4d8958d8dddb9104e006bc806a2607bd4ee71708
parent: 6cc33c1626028df5f504a9cf47d42d68a2fc9b1c
author: Marco Paniconi <marpan@google.com>
date: Thu Mar 1 04:45:11 EST 2018

vp9-svc: Fix to downsampling filter phase_shift.

Set phase_shift = 0 if the scale factors are
above 3/4. Removes artifact for scale factors
close to 1.

phase_shift = 8 is to get an averaging filter
(decimated pixel aligns to 8/16, midway between source pixels),
and only makes sense for scale factors multiples of
2 (1/2, 1/4,...).

Removes artifact for high scaling ratios.

Change-Id: Id0a85869d6c6156dda0032c697ded2de78fad6bd