commit a41a4860c0b3be7815f37b4ec833e87218307c4f
author Jingning Han <jingning@google.com> Fri Jun 14 11:28:56 2013 -0700
committer Jingning Han <jingning@google.com> Tue Jun 18 09:46:24 2013 -0700
tree 8d795f9d348b6c21627b36e0e266027e53263d4d
parent c43af9a8a3adc7bd3888e746ce7b7bd581c476ae

Make fdct32 computation flow within 16bit range

This commit makes use of dual fdct32x32 versions for rate-distortion
optimization loop and encoding process, respectively. The one for
rd loop requires only 16 bits precision for intermediate steps.
The original fdct32x32 that allows higher intermediate precision (18
bits) was retained for the encoding process only.

This allows speed-up for fdct32x32 in the rd loop. No performance
loss observed.

Change-Id: I3237770e39a8f87ed17ae5513c87228533397cc3