media/libvpx/vp9/common/vp9_quant_common.c@ac0c01689b40
media/libvpx/vp9/common/vp9_quant_common.c
Thu, 15 Jan 2015 15:59:08 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 15 Jan 2015 15:59:08 +0100
- branch
- TOR_BUG_9701
- changeset 10
- ac0c01689b40
- permissions
- -rw-r--r--
Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
1 /*
2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
11 #include "vp9/common/vp9_common.h"
12 #include "vp9/common/vp9_quant_common.h"
13 #include "vp9/common/vp9_seg_common.h"
15 #if 1
16 static const int16_t dc_qlookup[QINDEX_RANGE] = {
17 4, 8, 8, 9, 10, 11, 12, 12,
18 13, 14, 15, 16, 17, 18, 19, 19,
19 20, 21, 22, 23, 24, 25, 26, 26,
20 27, 28, 29, 30, 31, 32, 32, 33,
21 34, 35, 36, 37, 38, 38, 39, 40,
22 41, 42, 43, 43, 44, 45, 46, 47,
23 48, 48, 49, 50, 51, 52, 53, 53,
24 54, 55, 56, 57, 57, 58, 59, 60,
25 61, 62, 62, 63, 64, 65, 66, 66,
26 67, 68, 69, 70, 70, 71, 72, 73,
27 74, 74, 75, 76, 77, 78, 78, 79,
28 80, 81, 81, 82, 83, 84, 85, 85,
29 87, 88, 90, 92, 93, 95, 96, 98,
30 99, 101, 102, 104, 105, 107, 108, 110,
31 111, 113, 114, 116, 117, 118, 120, 121,
32 123, 125, 127, 129, 131, 134, 136, 138,
33 140, 142, 144, 146, 148, 150, 152, 154,
34 156, 158, 161, 164, 166, 169, 172, 174,
35 177, 180, 182, 185, 187, 190, 192, 195,
36 199, 202, 205, 208, 211, 214, 217, 220,
37 223, 226, 230, 233, 237, 240, 243, 247,
38 250, 253, 257, 261, 265, 269, 272, 276,
39 280, 284, 288, 292, 296, 300, 304, 309,
40 313, 317, 322, 326, 330, 335, 340, 344,
41 349, 354, 359, 364, 369, 374, 379, 384,
42 389, 395, 400, 406, 411, 417, 423, 429,
43 435, 441, 447, 454, 461, 467, 475, 482,
44 489, 497, 505, 513, 522, 530, 539, 549,
45 559, 569, 579, 590, 602, 614, 626, 640,
46 654, 668, 684, 700, 717, 736, 755, 775,
47 796, 819, 843, 869, 896, 925, 955, 988,
48 1022, 1058, 1098, 1139, 1184, 1232, 1282, 1336,
49 };
51 static const int16_t ac_qlookup[QINDEX_RANGE] = {
52 4, 8, 9, 10, 11, 12, 13, 14,
53 15, 16, 17, 18, 19, 20, 21, 22,
54 23, 24, 25, 26, 27, 28, 29, 30,
55 31, 32, 33, 34, 35, 36, 37, 38,
56 39, 40, 41, 42, 43, 44, 45, 46,
57 47, 48, 49, 50, 51, 52, 53, 54,
58 55, 56, 57, 58, 59, 60, 61, 62,
59 63, 64, 65, 66, 67, 68, 69, 70,
60 71, 72, 73, 74, 75, 76, 77, 78,
61 79, 80, 81, 82, 83, 84, 85, 86,
62 87, 88, 89, 90, 91, 92, 93, 94,
63 95, 96, 97, 98, 99, 100, 101, 102,
64 104, 106, 108, 110, 112, 114, 116, 118,
65 120, 122, 124, 126, 128, 130, 132, 134,
66 136, 138, 140, 142, 144, 146, 148, 150,
67 152, 155, 158, 161, 164, 167, 170, 173,
68 176, 179, 182, 185, 188, 191, 194, 197,
69 200, 203, 207, 211, 215, 219, 223, 227,
70 231, 235, 239, 243, 247, 251, 255, 260,
71 265, 270, 275, 280, 285, 290, 295, 300,
72 305, 311, 317, 323, 329, 335, 341, 347,
73 353, 359, 366, 373, 380, 387, 394, 401,
74 408, 416, 424, 432, 440, 448, 456, 465,
75 474, 483, 492, 501, 510, 520, 530, 540,
76 550, 560, 571, 582, 593, 604, 615, 627,
77 639, 651, 663, 676, 689, 702, 715, 729,
78 743, 757, 771, 786, 801, 816, 832, 848,
79 864, 881, 898, 915, 933, 951, 969, 988,
80 1007, 1026, 1046, 1066, 1087, 1108, 1129, 1151,
81 1173, 1196, 1219, 1243, 1267, 1292, 1317, 1343,
82 1369, 1396, 1423, 1451, 1479, 1508, 1537, 1567,
83 1597, 1628, 1660, 1692, 1725, 1759, 1793, 1828,
84 };
86 void vp9_init_quant_tables(void) { }
87 #else
88 static int16_t dc_qlookup[QINDEX_RANGE];
89 static int16_t ac_qlookup[QINDEX_RANGE];
91 #define ACDC_MIN 8
93 // TODO(dkovalev) move to common and reuse
94 static double poly3(double a, double b, double c, double d, double x) {
95 return a*x*x*x + b*x*x + c*x + d;
96 }
98 void vp9_init_quant_tables() {
99 int i, val = 4;
101 // A "real" q of 1.0 forces lossless mode.
102 // In practice non lossless Q's between 1.0 and 2.0 (represented here by
103 // integer values from 5-7 give poor rd results (lower psnr and often
104 // larger size than the lossless encode. To block out those "not very useful"
105 // values we increment the ac and dc q lookup values by 4 after position 0.
106 ac_qlookup[0] = val;
107 dc_qlookup[0] = val;
108 val += 4;
110 for (i = 1; i < QINDEX_RANGE; i++) {
111 const int ac_val = val;
113 val = (int)(val * 1.01975);
114 if (val == ac_val)
115 ++val;
117 ac_qlookup[i] = (int16_t)ac_val;
118 dc_qlookup[i] = (int16_t)MAX(ACDC_MIN, poly3(0.000000305, -0.00065, 0.9,
119 0.5, ac_val));
120 }
121 }
122 #endif
124 int16_t vp9_dc_quant(int qindex, int delta) {
125 return dc_qlookup[clamp(qindex + delta, 0, MAXQ)];
126 }
128 int16_t vp9_ac_quant(int qindex, int delta) {
129 return ac_qlookup[clamp(qindex + delta, 0, MAXQ)];
130 }
133 int vp9_get_qindex(struct segmentation *seg, int segment_id, int base_qindex) {
134 if (vp9_segfeature_active(seg, segment_id, SEG_LVL_ALT_Q)) {
135 const int data = vp9_get_segdata(seg, segment_id, SEG_LVL_ALT_Q);
136 return seg->abs_delta == SEGMENT_ABSDATA ?
137 data : // Abs value
138 clamp(base_qindex + data, 0, MAXQ); // Delta value
139 } else {
140 return base_qindex;
141 }
142 }
