ref: caed92d0e50ce573bd316f6a9e02449fd310b048
dir: /vp8/common/quant_common.c/
/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "quant_common.h"
#if !CONFIG_EXTEND_QRANGE
static const int dc_qlookup[QINDEX_RANGE] =
{
4, 5, 6, 7, 8, 9, 10, 10, 11, 12, 13, 14, 15, 16, 17, 17,
18, 19, 20, 20, 21, 21, 22, 22, 23, 23, 24, 25, 25, 26, 27, 28,
29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43,
44, 45, 46, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58,
59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74,
75, 76, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89,
91, 93, 95, 96, 98, 100, 101, 102, 104, 106, 108, 110, 112, 114, 116, 118,
122, 124, 126, 128, 130, 132, 134, 136, 138, 140, 143, 145, 148, 151, 154, 157,
};
static const int ac_qlookup[QINDEX_RANGE] =
{
4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,
52, 53, 54, 55, 56, 57, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76,
78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100, 102, 104, 106, 108,
110, 112, 114, 116, 119, 122, 125, 128, 131, 134, 137, 140, 143, 146, 149, 152,
155, 158, 161, 164, 167, 170, 173, 177, 181, 185, 189, 193, 197, 201, 205, 209,
213, 217, 221, 225, 229, 234, 239, 245, 249, 254, 259, 264, 269, 274, 279, 284,
};
#else
static int dc_qlookup[QINDEX_RANGE];
static int ac_qlookup[QINDEX_RANGE];
#endif
#if CONFIG_EXTEND_QRANGE
#define ACDC_MIN 4
void vp8_init_quant_tables()
{
int i;
//int current_val = 16;
//int last_val = 16;
int current_val = 4;
int last_val = 4;
int ac_val;
//int dc_max;
for ( i = 0; i < QINDEX_RANGE; i++ )
{
ac_qlookup[i] = current_val;
//current_val = (int)((double)current_val * 1.018);
current_val = (int)((double)current_val * 1.02);
if ( current_val == last_val )
current_val++;
last_val = current_val;
ac_val = ac_qlookup[i];
dc_qlookup[i] = (0.000000305 * ac_val * ac_val * ac_val) +
(-0.00065 * ac_val * ac_val) +
(0.9 * ac_val) + 0.5;
//dc_max = (int)(((double)ac_val * 0.75) + 0.5);
//if ( dc_qlookup[i] > dc_max )
// dc_qlookup[i] = dc_max;
if ( dc_qlookup[i] < ACDC_MIN )
dc_qlookup[i] = ACDC_MIN;
}
}
#endif
int vp8_dc_quant(int QIndex, int Delta)
{
int retval;
QIndex = QIndex + Delta;
if (QIndex > MAXQ)
QIndex = MAXQ;
else if (QIndex < 0)
QIndex = 0;
retval = dc_qlookup[ QIndex ];
return retval;
}
int vp8_dc2quant(int QIndex, int Delta)
{
int retval;
QIndex = QIndex + Delta;
if (QIndex > MAXQ)
QIndex = MAXQ;
else if (QIndex < 0)
QIndex = 0;
#if !CONFIG_EXTEND_QRANGE
retval = dc_qlookup[ QIndex ] * 2;
#else
retval = dc_qlookup[ QIndex ];
#endif
return retval;
}
int vp8_dc_uv_quant(int QIndex, int Delta)
{
int retval;
QIndex = QIndex + Delta;
if (QIndex > MAXQ)
QIndex = MAXQ;
else if (QIndex < 0)
QIndex = 0;
retval = dc_qlookup[ QIndex ];
return retval;
}
int vp8_ac_yquant(int QIndex)
{
int retval;
if (QIndex > MAXQ)
QIndex = MAXQ;
else if (QIndex < 0)
QIndex = 0;
retval = ac_qlookup[ QIndex ];
return retval;
}
int vp8_ac2quant(int QIndex, int Delta)
{
int retval;
QIndex = QIndex + Delta;
if (QIndex > MAXQ)
QIndex = MAXQ;
else if (QIndex < 0)
QIndex = 0;
#if !CONFIG_EXTEND_QRANGE
retval = (ac_qlookup[ QIndex ] * 155) / 100;
if (retval < 8)
retval = 8;
#else
retval = (ac_qlookup[ QIndex ] * 775) / 1000;
if (retval < 4)
retval = 4;
#endif
return retval;
}
int vp8_ac_uv_quant(int QIndex, int Delta)
{
int retval;
QIndex = QIndex + Delta;
if (QIndex > MAXQ)
QIndex = MAXQ;
else if (QIndex < 0)
QIndex = 0;
retval = ac_qlookup[ QIndex ];
return retval;
}