Early termination after partition NONE is done in RD.
This patch allows the encoder to skip the search for partition SPLIT, HORZ, VERT after the search for partition NONE is done in RD optimization. It uses the first pass block-wise statistics to make the decision. If all 16x16 blocks in the current partition have zero motions and small residues from the frist pass statistics, and it has small difference variance, further partition search is skipped. For speed 2 setting, experiments on general youtube clips show that the speedup varies from 1% - 10%, 5% on average. On the performance side in PSNR, derf 0.004%, yt -0.059%, hd -0.106%, stdhd 0.032%. For hard stdhd clips: park_joy_1080p, 502952 ms -> 503307 ms (-0.07%) pedestrian_area_1080p, 227049 ms -> 220531 ms (+3%) This feature is under the compilation flag CONFIG_FP_MB_STATS and it is off in current setting. Change-Id: I554537e9242178263b65ebe14a04f9c221b58bae
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