f51f0998e1
For 1 pass cbr mode: allow for two-stage 1:2 scaling (which will use the 1:2 optimized scaler) if the spatial layer is 1/4x1/4 of souce. Without this change, the base layer for 3 spatial layers would be using the non-normative scaler which is un-optimized/C code. Change-Id: Ifcf526ec2aaf3e5fa7924588d9dd8660bf02fb46