tree cd0f5ca8dd9a29a1d20e33f6ceeced59bef226e0
parent 1e233554d10dd94171c27318b9e9ba4bc0f88c3e
author Ranjit Kumar Tulabandu <ranjit.tulabandu@ittiam.com> 1663606513 +0530
committer Yunqing Wang <yunqingwang@google.com> 1663774624 +0000

rtc-screen:Populate source_sad_nonrd using src_sad_blk_64x64

In parent version, x->content_state_sb.source_sad_nonrd is
populated based on cpi->rc.frame_source_sad or residual
source variance computed at superblock level assuming zero
MV. In this CL, cpi->src_sad_blk_64x64 is used to identify
the superblocks with zero source SAD and hence residual
variance computation is avoided for these cases. If
superblock SAD is non-zero, the population of
x->content_state_sb.source_sad_nonrd is same as that of
parent version.

This CL is seen to give speed-up for screen contents
though it is applicable for non-screen contents as well.
The CL is bit exact as zero source SAD implies zero
residual source variance and zero residual source SSE.

For rtc-screen,
     Instruction Count        BD-Rate Loss(%)
cpu     Reduction(%)    avg.psnr   ovr.psnr    ssim
9         0.303         0.0000     0.0000    0.0000
10        0.325         0.0000     0.0000    0.0000

Change-Id: I5740d245f94ae8f1adbead43d91124357602f2f3