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quant_common.c
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quant_common.c
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/*
* 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"
static const int dc_qlookup[QINDEX_RANGE] =
{
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122, 124, 126, 128, 130, 132, 134, 136, 138, 140, 143, 145, 148, 151, 154, 157,
};
static const int ac_qlookup[QINDEX_RANGE] =
{
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20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
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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,
};
int vp8_dc_quant(int QIndex, int Delta)
{
int retval;
QIndex = QIndex + Delta;
if (QIndex > 127)
QIndex = 127;
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 > 127)
QIndex = 127;
else if (QIndex < 0)
QIndex = 0;
retval = dc_qlookup[ QIndex ] * 2;
return retval;
}
int vp8_dc_uv_quant(int QIndex, int Delta)
{
int retval;
QIndex = QIndex + Delta;
if (QIndex > 127)
QIndex = 127;
else if (QIndex < 0)
QIndex = 0;
retval = dc_qlookup[ QIndex ];
if (retval > 132)
retval = 132;
return retval;
}
int vp8_ac_yquant(int QIndex)
{
int retval;
if (QIndex > 127)
QIndex = 127;
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 > 127)
QIndex = 127;
else if (QIndex < 0)
QIndex = 0;
/* For all x in [0..284], x*155/100 is bitwise equal to (x*101581) >> 16.
* The smallest precision for that is '(x*6349) >> 12' but 16 is a good
* word size. */
retval = (ac_qlookup[ QIndex ] * 101581) >> 16;
if (retval < 8)
retval = 8;
return retval;
}
int vp8_ac_uv_quant(int QIndex, int Delta)
{
int retval;
QIndex = QIndex + Delta;
if (QIndex > 127)
QIndex = 127;
else if (QIndex < 0)
QIndex = 0;
retval = ac_qlookup[ QIndex ];
return retval;
}