From: Yaowu Xu <yaowu@google.com>
Date: Mon, 6 Dec 2010 21:33:01 +0000 (-0800)
Subject: adjust RDMULT for UV plane in quantization RDO
X-Git-Tag: v0.9.6~156^2
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=7c03a1c3083645ef1b59078a018798aed8d95f96;p=libvpx

adjust RDMULT for UV plane in quantization RDO

This patch adds a weighting factor on RDMULT for UV blocks. The change
has an overall gain about 0.5% based on ssim, between 0.1 and 0.2% by
psnr numbers.

Change-Id: I97781b077ce3bb7e34241b03268491917e8d1d72
---

diff --git a/vp8/encoder/encodemb.c b/vp8/encoder/encodemb.c
index e9753ac48..5ee755942 100644
--- a/vp8/encoder/encodemb.c
+++ b/vp8/encoder/encodemb.c
@@ -243,9 +243,9 @@ struct vp8_token_state{
 };
 
 // TODO: experiments to find optimal multiple numbers
-#define Y1_RD_MULT 1
-#define UV_RD_MULT 1
-#define Y2_RD_MULT 4
+#define Y1_RD_MULT 4
+#define UV_RD_MULT 2
+#define Y2_RD_MULT 16
 
 static const int plane_rd_mult[4]=
 {
@@ -309,7 +309,7 @@ void vp8_optimize_b(MACROBLOCK *mb, int ib, int type,
     eob = d->eob;
 
     /* Now set up a Viterbi trellis to evaluate alternative roundings. */
-    rdmult = (mb->rdmult << 2)*err_mult;
+    rdmult = mb->rdmult * err_mult;
     if(mb->e_mbd.mode_info_context->mbmi.ref_frame==INTRA_FRAME)
         rdmult = (rdmult * 9)>>4;