ref: a6bc3dfb0f8e46017d7823985f8383a8dc6cc68b
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"
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,
};
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;
}