ref: ef2f27f10e39bc21254effe1083773c9b761d487
parent: 6adbe09058f05a42ff1360ab55e3916f45e39a0c
author: Yaowu Xu <yaowu@google.com>
date: Wed Nov 10 16:16:17 EST 2010
make rdmult adaptive for intra in quantizer RDO This intends to correct the tendency that VP8 aggressively favors rate on intra coded frames. Experiments tested different numbers in [0, 1] and found 9/16 overall provided about 2-4% gains for all-intra coded clips based on vpx-ssim metric. The impact on regular encoded clips is much smaller but positive overall. Overall impact on psnr is also positive even though very small. Change-Id: If808553aaaa87fdd44691f9787820ac9856d9f8a
--- a/vp8/encoder/encodemb.c
+++ b/vp8/encoder/encodemb.c
@@ -309,8 +309,10 @@
eob = d->eob;
/* Now set up a Viterbi trellis to evaluate alternative roundings. */
- /* TODO: These should vary with the block type, since the quantizer does. */
rdmult = (mb->rdmult << 2)*err_mult;
+ if(mb->e_mbd.mode_info_context->mbmi.ref_frame==INTRA_FRAME)
+ rdmult = (rdmult * 9)>>4;
+
rddiv = mb->rddiv;
best_mask[0] = best_mask[1] = 0;
/* Initialize the sentinel node of the trellis. */
--
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