From 3b9c19aaa7b8830a896c5f578a3ce6c6a7953947 Mon Sep 17 00:00:00 2001
From: Jingning Han <jingning@google.com>
Date: Wed, 18 Jun 2014 11:51:41 -0700
Subject: [PATCH] Remove unused vp9_init_quant_tables function

This function is not effectively used, hence removed.

Change-Id: I2e8e48fa07c7518931690f3b04bae920cb360e49
---
 vp9/common/vp9_quant_common.c | 39 -----------------------------------
 vp9/common/vp9_quant_common.h |  2 --
 vp9/decoder/vp9_decoder.c     |  1 -
 vp9/encoder/vp9_encoder.c     |  2 --
 4 files changed, 44 deletions(-)

diff --git a/vp9/common/vp9_quant_common.c b/vp9/common/vp9_quant_common.c
index def12554d..3332e58e6 100644
--- a/vp9/common/vp9_quant_common.c
+++ b/vp9/common/vp9_quant_common.c
@@ -12,7 +12,6 @@
 #include "vp9/common/vp9_quant_common.h"
 #include "vp9/common/vp9_seg_common.h"
 
-#if 1
 static const int16_t dc_qlookup[QINDEX_RANGE] = {
   4,       8,    8,    9,   10,   11,   12,   12,
   13,     14,   15,   16,   17,   18,   19,   19,
@@ -83,44 +82,6 @@ static const int16_t ac_qlookup[QINDEX_RANGE] = {
   1597, 1628, 1660, 1692, 1725, 1759, 1793, 1828,
 };
 
-void vp9_init_quant_tables(void) { }
-#else
-static int16_t dc_qlookup[QINDEX_RANGE];
-static int16_t ac_qlookup[QINDEX_RANGE];
-
-#define ACDC_MIN 8
-
-// TODO(dkovalev) move to common and reuse
-static double poly3(double a, double b, double c, double d, double x) {
-  return a*x*x*x + b*x*x + c*x + d;
-}
-
-void vp9_init_quant_tables() {
-  int i, val = 4;
-
-  // A "real" q of 1.0 forces lossless mode.
-  // In practice non lossless Q's between 1.0 and 2.0 (represented here by
-  // integer values from 5-7 give poor rd results (lower psnr and often
-  // larger size than the lossless encode. To block out those "not very useful"
-  // values we increment the ac and dc q lookup values by 4 after position 0.
-  ac_qlookup[0] = val;
-  dc_qlookup[0] = val;
-  val += 4;
-
-  for (i = 1; i < QINDEX_RANGE; i++) {
-    const int ac_val = val;
-
-    val = (int)(val * 1.01975);
-    if (val == ac_val)
-      ++val;
-
-    ac_qlookup[i] = (int16_t)ac_val;
-    dc_qlookup[i] = (int16_t)MAX(ACDC_MIN, poly3(0.000000305, -0.00065, 0.9,
-                                                 0.5, ac_val));
-  }
-}
-#endif
-
 int16_t vp9_dc_quant(int qindex, int delta) {
   return dc_qlookup[clamp(qindex + delta, 0, MAXQ)];
 }
diff --git a/vp9/common/vp9_quant_common.h b/vp9/common/vp9_quant_common.h
index 581104006..d1545d93c 100644
--- a/vp9/common/vp9_quant_common.h
+++ b/vp9/common/vp9_quant_common.h
@@ -22,8 +22,6 @@ extern "C" {
 #define QINDEX_RANGE (MAXQ - MINQ + 1)
 #define QINDEX_BITS 8
 
-void vp9_init_quant_tables();
-
 int16_t vp9_dc_quant(int qindex, int delta);
 int16_t vp9_ac_quant(int qindex, int delta);
 
diff --git a/vp9/decoder/vp9_decoder.c b/vp9/decoder/vp9_decoder.c
index 5859859fa..06663befc 100644
--- a/vp9/decoder/vp9_decoder.c
+++ b/vp9/decoder/vp9_decoder.c
@@ -37,7 +37,6 @@ static void initialize_dec() {
 
   if (!init_done) {
     vp9_init_neighbors();
-    vp9_init_quant_tables();
     init_done = 1;
   }
 }
diff --git a/vp9/encoder/vp9_encoder.c b/vp9/encoder/vp9_encoder.c
index 525eccd56..cb47966ab 100644
--- a/vp9/encoder/vp9_encoder.c
+++ b/vp9/encoder/vp9_encoder.c
@@ -142,8 +142,6 @@ void vp9_initialize_enc() {
 
   if (!init_done) {
     vp9_init_neighbors();
-    vp9_init_quant_tables();
-
     vp9_coef_tree_initialize();
     vp9_tokenize_initialize();
     vp9_init_me_luts();
-- 
2.40.0