tree d096b0fc85c8a2b17f26cf7c63714924667f85ef
parent a2dfbbd7d69f2991b571090c6b356203dffba523
author paulwilkins <paulwilkins@google.com> 1454513852 +0000
committer paulwilkins <paulwilkins@google.com> 1495108562 +0100

Changes to modified error.

The modified error was a derivative of the "coded_error"
that was used to allocate bits between different frames on the
assumption that the allocation should be linear in terms of this
modified error.  I.e. a frame with double the modified error score
should all things being equal get double the number of bits. The
code also included upper and lower caps derived from input
VBR parameters.

This patch improves the initial calculation of the clip mean error
(now called "mean_mod_score" as it is no longer a prediction error)
used as the midpoint for the rate distribution function and normalizes
the output "modified scores" scores such that 1.0 indicates a frame
in the middle of the distribution.  The VBR upper and lower caps are
then applied directly to a  frame's normalized score.

This refactoring is intended to make it easier to drop in alternative
distribution functions or to base the rate allocation on a corpus wide
midpoint (rather than the clip mean).

Change-Id: I4fb09de637e93566bfc4e022b2e7d04660817195