ref: af660715c01fc5403700c49686885b2f0ee6133b
parent: 1b5421f3c5a8cf76db2fc8b939be706ad63530e7
author: Ronald S. Bultje <rbultje@google.com>
date: Thu Jun 27 13:41:54 EDT 2013
Make coefficient skip condition an explicit RD choice. This commit replaces zrun_zbin_boost, a method of biasing non-zero coefficients following runs of zero-coefficients to be rounded towards zero, with an explicit skip-block choice in the RD loop. The logic is basically that if individual coefficients should be rounded towards zero (from a RD point of view), the trellis/optimize loop should take care of it. If whole blocks should be zero (from a RD point of view), a single RD check is much more efficient than a complete serialization of the quantization loop. Quality change: derf +0.5% psnr, +1.6% ssim; yt +0.6% psnr, +1.1% ssim. SIMD for quantize will follow in a separate patch. Results for other test sets pending. Change-Id: Ife5fa641163ac5150ac428011e87188f1937c1f4