tree 108df2955175a88674d9938d97644c5259b033e7
parent 14c677c0d45d40b6f8dd690280386cd8ef103271
author chiyotsai <chiyotsai@google.com> 1578519104 -0800
committer Chi Yo Tsai <chiyotsai@google.com> 1579123790 +0000

Clean up some rd_threshold related codes

This CL contains the following changes:
 - macroize the constatn multiplifers used by rd_thresholds
 - correct the initial value of rd->thresh_mult to 0
 - replace unnecessary addition with asignment
 - make the initial value of thresh_mult independent of speed feature as
 no significant quality change is observed.
 - symmetrize the bsizes when updating rd_thresh by going 2 levels above
 and below

Overall, the speed remainsneutral, while BDRate decreased by about 0.02%.

STATS_CHANGED

Change-Id: I0606f5f1b4430922223d802fc82ae3221f06ad7c