1*fb1b10abSAndroid Build Coastguard Worker /*
2*fb1b10abSAndroid Build Coastguard Worker * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
3*fb1b10abSAndroid Build Coastguard Worker *
4*fb1b10abSAndroid Build Coastguard Worker * Use of this source code is governed by a BSD-style license
5*fb1b10abSAndroid Build Coastguard Worker * that can be found in the LICENSE file in the root of the source
6*fb1b10abSAndroid Build Coastguard Worker * tree. An additional intellectual property rights grant can be found
7*fb1b10abSAndroid Build Coastguard Worker * in the file PATENTS. All contributing project authors may
8*fb1b10abSAndroid Build Coastguard Worker * be found in the AUTHORS file in the root of the source tree.
9*fb1b10abSAndroid Build Coastguard Worker */
10*fb1b10abSAndroid Build Coastguard Worker
11*fb1b10abSAndroid Build Coastguard Worker #include "quant_common.h"
12*fb1b10abSAndroid Build Coastguard Worker
13*fb1b10abSAndroid Build Coastguard Worker static const int dc_qlookup[QINDEX_RANGE] = {
14*fb1b10abSAndroid Build Coastguard Worker 4, 5, 6, 7, 8, 9, 10, 10, 11, 12, 13, 14, 15, 16, 17,
15*fb1b10abSAndroid Build Coastguard Worker 17, 18, 19, 20, 20, 21, 21, 22, 22, 23, 23, 24, 25, 25, 26,
16*fb1b10abSAndroid Build Coastguard Worker 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40,
17*fb1b10abSAndroid Build Coastguard Worker 41, 42, 43, 44, 45, 46, 46, 47, 48, 49, 50, 51, 52, 53, 54,
18*fb1b10abSAndroid Build Coastguard Worker 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69,
19*fb1b10abSAndroid Build Coastguard Worker 70, 71, 72, 73, 74, 75, 76, 76, 77, 78, 79, 80, 81, 82, 83,
20*fb1b10abSAndroid Build Coastguard Worker 84, 85, 86, 87, 88, 89, 91, 93, 95, 96, 98, 100, 101, 102, 104,
21*fb1b10abSAndroid Build Coastguard Worker 106, 108, 110, 112, 114, 116, 118, 122, 124, 126, 128, 130, 132, 134, 136,
22*fb1b10abSAndroid Build Coastguard Worker 138, 140, 143, 145, 148, 151, 154, 157,
23*fb1b10abSAndroid Build Coastguard Worker };
24*fb1b10abSAndroid Build Coastguard Worker
25*fb1b10abSAndroid Build Coastguard Worker static const int ac_qlookup[QINDEX_RANGE] = {
26*fb1b10abSAndroid Build Coastguard Worker 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
27*fb1b10abSAndroid Build Coastguard Worker 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33,
28*fb1b10abSAndroid Build Coastguard Worker 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
29*fb1b10abSAndroid Build Coastguard Worker 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 60, 62, 64, 66, 68,
30*fb1b10abSAndroid Build Coastguard Worker 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98,
31*fb1b10abSAndroid Build Coastguard Worker 100, 102, 104, 106, 108, 110, 112, 114, 116, 119, 122, 125, 128, 131, 134,
32*fb1b10abSAndroid Build Coastguard Worker 137, 140, 143, 146, 149, 152, 155, 158, 161, 164, 167, 170, 173, 177, 181,
33*fb1b10abSAndroid Build Coastguard Worker 185, 189, 193, 197, 201, 205, 209, 213, 217, 221, 225, 229, 234, 239, 245,
34*fb1b10abSAndroid Build Coastguard Worker 249, 254, 259, 264, 269, 274, 279, 284,
35*fb1b10abSAndroid Build Coastguard Worker };
36*fb1b10abSAndroid Build Coastguard Worker
vp8_dc_quant(int QIndex,int Delta)37*fb1b10abSAndroid Build Coastguard Worker int vp8_dc_quant(int QIndex, int Delta) {
38*fb1b10abSAndroid Build Coastguard Worker int retval;
39*fb1b10abSAndroid Build Coastguard Worker
40*fb1b10abSAndroid Build Coastguard Worker QIndex = QIndex + Delta;
41*fb1b10abSAndroid Build Coastguard Worker
42*fb1b10abSAndroid Build Coastguard Worker if (QIndex > 127) {
43*fb1b10abSAndroid Build Coastguard Worker QIndex = 127;
44*fb1b10abSAndroid Build Coastguard Worker } else if (QIndex < 0) {
45*fb1b10abSAndroid Build Coastguard Worker QIndex = 0;
46*fb1b10abSAndroid Build Coastguard Worker }
47*fb1b10abSAndroid Build Coastguard Worker
48*fb1b10abSAndroid Build Coastguard Worker retval = dc_qlookup[QIndex];
49*fb1b10abSAndroid Build Coastguard Worker return retval;
50*fb1b10abSAndroid Build Coastguard Worker }
51*fb1b10abSAndroid Build Coastguard Worker
vp8_dc2quant(int QIndex,int Delta)52*fb1b10abSAndroid Build Coastguard Worker int vp8_dc2quant(int QIndex, int Delta) {
53*fb1b10abSAndroid Build Coastguard Worker int retval;
54*fb1b10abSAndroid Build Coastguard Worker
55*fb1b10abSAndroid Build Coastguard Worker QIndex = QIndex + Delta;
56*fb1b10abSAndroid Build Coastguard Worker
57*fb1b10abSAndroid Build Coastguard Worker if (QIndex > 127) {
58*fb1b10abSAndroid Build Coastguard Worker QIndex = 127;
59*fb1b10abSAndroid Build Coastguard Worker } else if (QIndex < 0) {
60*fb1b10abSAndroid Build Coastguard Worker QIndex = 0;
61*fb1b10abSAndroid Build Coastguard Worker }
62*fb1b10abSAndroid Build Coastguard Worker
63*fb1b10abSAndroid Build Coastguard Worker retval = dc_qlookup[QIndex] * 2;
64*fb1b10abSAndroid Build Coastguard Worker return retval;
65*fb1b10abSAndroid Build Coastguard Worker }
vp8_dc_uv_quant(int QIndex,int Delta)66*fb1b10abSAndroid Build Coastguard Worker int vp8_dc_uv_quant(int QIndex, int Delta) {
67*fb1b10abSAndroid Build Coastguard Worker int retval;
68*fb1b10abSAndroid Build Coastguard Worker
69*fb1b10abSAndroid Build Coastguard Worker QIndex = QIndex + Delta;
70*fb1b10abSAndroid Build Coastguard Worker
71*fb1b10abSAndroid Build Coastguard Worker if (QIndex > 127) {
72*fb1b10abSAndroid Build Coastguard Worker QIndex = 127;
73*fb1b10abSAndroid Build Coastguard Worker } else if (QIndex < 0) {
74*fb1b10abSAndroid Build Coastguard Worker QIndex = 0;
75*fb1b10abSAndroid Build Coastguard Worker }
76*fb1b10abSAndroid Build Coastguard Worker
77*fb1b10abSAndroid Build Coastguard Worker retval = dc_qlookup[QIndex];
78*fb1b10abSAndroid Build Coastguard Worker
79*fb1b10abSAndroid Build Coastguard Worker if (retval > 132) retval = 132;
80*fb1b10abSAndroid Build Coastguard Worker
81*fb1b10abSAndroid Build Coastguard Worker return retval;
82*fb1b10abSAndroid Build Coastguard Worker }
83*fb1b10abSAndroid Build Coastguard Worker
vp8_ac_yquant(int QIndex)84*fb1b10abSAndroid Build Coastguard Worker int vp8_ac_yquant(int QIndex) {
85*fb1b10abSAndroid Build Coastguard Worker int retval;
86*fb1b10abSAndroid Build Coastguard Worker
87*fb1b10abSAndroid Build Coastguard Worker if (QIndex > 127) {
88*fb1b10abSAndroid Build Coastguard Worker QIndex = 127;
89*fb1b10abSAndroid Build Coastguard Worker } else if (QIndex < 0) {
90*fb1b10abSAndroid Build Coastguard Worker QIndex = 0;
91*fb1b10abSAndroid Build Coastguard Worker }
92*fb1b10abSAndroid Build Coastguard Worker
93*fb1b10abSAndroid Build Coastguard Worker retval = ac_qlookup[QIndex];
94*fb1b10abSAndroid Build Coastguard Worker return retval;
95*fb1b10abSAndroid Build Coastguard Worker }
96*fb1b10abSAndroid Build Coastguard Worker
vp8_ac2quant(int QIndex,int Delta)97*fb1b10abSAndroid Build Coastguard Worker int vp8_ac2quant(int QIndex, int Delta) {
98*fb1b10abSAndroid Build Coastguard Worker int retval;
99*fb1b10abSAndroid Build Coastguard Worker
100*fb1b10abSAndroid Build Coastguard Worker QIndex = QIndex + Delta;
101*fb1b10abSAndroid Build Coastguard Worker
102*fb1b10abSAndroid Build Coastguard Worker if (QIndex > 127) {
103*fb1b10abSAndroid Build Coastguard Worker QIndex = 127;
104*fb1b10abSAndroid Build Coastguard Worker } else if (QIndex < 0) {
105*fb1b10abSAndroid Build Coastguard Worker QIndex = 0;
106*fb1b10abSAndroid Build Coastguard Worker }
107*fb1b10abSAndroid Build Coastguard Worker
108*fb1b10abSAndroid Build Coastguard Worker /* For all x in [0..284], x*155/100 is bitwise equal to (x*101581) >> 16.
109*fb1b10abSAndroid Build Coastguard Worker * The smallest precision for that is '(x*6349) >> 12' but 16 is a good
110*fb1b10abSAndroid Build Coastguard Worker * word size. */
111*fb1b10abSAndroid Build Coastguard Worker retval = (ac_qlookup[QIndex] * 101581) >> 16;
112*fb1b10abSAndroid Build Coastguard Worker
113*fb1b10abSAndroid Build Coastguard Worker if (retval < 8) retval = 8;
114*fb1b10abSAndroid Build Coastguard Worker
115*fb1b10abSAndroid Build Coastguard Worker return retval;
116*fb1b10abSAndroid Build Coastguard Worker }
vp8_ac_uv_quant(int QIndex,int Delta)117*fb1b10abSAndroid Build Coastguard Worker int vp8_ac_uv_quant(int QIndex, int Delta) {
118*fb1b10abSAndroid Build Coastguard Worker int retval;
119*fb1b10abSAndroid Build Coastguard Worker
120*fb1b10abSAndroid Build Coastguard Worker QIndex = QIndex + Delta;
121*fb1b10abSAndroid Build Coastguard Worker
122*fb1b10abSAndroid Build Coastguard Worker if (QIndex > 127) {
123*fb1b10abSAndroid Build Coastguard Worker QIndex = 127;
124*fb1b10abSAndroid Build Coastguard Worker } else if (QIndex < 0) {
125*fb1b10abSAndroid Build Coastguard Worker QIndex = 0;
126*fb1b10abSAndroid Build Coastguard Worker }
127*fb1b10abSAndroid Build Coastguard Worker
128*fb1b10abSAndroid Build Coastguard Worker retval = ac_qlookup[QIndex];
129*fb1b10abSAndroid Build Coastguard Worker return retval;
130*fb1b10abSAndroid Build Coastguard Worker }
131