tree 94e47b0dab0d1aa03c2439c7d9c52fe570692aa8
parent 41d286f3746bdb17bbe4ad0f0d45504af514ffde
author Urvang Joshi <urvang@google.com> 1537901809 -0700
committer Urvang Joshi <urvang@google.com> 1538602678 +0000

VBR: Improve bit re-allocation per pyramid level.

Earlier, bits were reduced for leaf level frames and added for
internal ARF frames in the same loop. This meant that number of bits
reduced may NOT equal the number of bits added.

Now, we reduce bits from leaf level in the first loop, and then the
total of those bits is then reallocated to internal ARFs in a separate
loop. So, it's guaranteed that number of bits reduced = number of bits
added.

Overall BDRate (PSNR) improvement:

lowres: -0.594%
(garden_sif: -8.60%
 crew_cif:   -5.80%)

midres: -0.186%
(crew_4cif_30fps: -3.76%
 speed_bag_480p:  -1.45%)

STATS_CHANGED

Change-Id: I3cec7eaa980bc7a524e0a6ffdd50ee86327b7c04