ref: 9bcd75056582cce1ee8cd2ebeb2fbace0c9d9629
dir: /vp9/common/vp9_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 "vp9/common/vp9_common.h"
#include "vp9/common/vp9_quant_common.h"
#include "vp9/common/vp9_seg_common.h"
#if 1
static const int16_t dc_qlookup[QINDEX_RANGE] = {
4, 8, 8, 9, 10, 11, 12, 12,
13, 14, 15, 16, 17, 18, 19, 19,
20, 21, 22, 23, 24, 25, 26, 26,
27, 28, 29, 30, 31, 32, 32, 33,
34, 35, 36, 37, 38, 38, 39, 40,
41, 42, 43, 43, 44, 45, 46, 47,
48, 48, 49, 50, 51, 52, 53, 53,
54, 55, 56, 57, 57, 58, 59, 60,
61, 62, 62, 63, 64, 65, 66, 66,
67, 68, 69, 70, 70, 71, 72, 73,
74, 74, 75, 76, 77, 78, 78, 79,
80, 81, 81, 82, 83, 84, 85, 85,
87, 88, 90, 92, 93, 95, 96, 98,
99, 101, 102, 104, 105, 107, 108, 110,
111, 113, 114, 116, 117, 118, 120, 121,
123, 125, 127, 129, 131, 134, 136, 138,
140, 142, 144, 146, 148, 150, 152, 154,
156, 158, 161, 164, 166, 169, 172, 174,
177, 180, 182, 185, 187, 190, 192, 195,
199, 202, 205, 208, 211, 214, 217, 220,
223, 226, 230, 233, 237, 240, 243, 247,
250, 253, 257, 261, 265, 269, 272, 276,
280, 284, 288, 292, 296, 300, 304, 309,
313, 317, 322, 326, 330, 335, 340, 344,
349, 354, 359, 364, 369, 374, 379, 384,
389, 395, 400, 406, 411, 417, 423, 429,
435, 441, 447, 454, 461, 467, 475, 482,
489, 497, 505, 513, 522, 530, 539, 549,
559, 569, 579, 590, 602, 614, 626, 640,
654, 668, 684, 700, 717, 736, 755, 775,
796, 819, 843, 869, 896, 925, 955, 988,
1022, 1058, 1098, 1139, 1184, 1232, 1282, 1336,
};
static const int16_t ac_qlookup[QINDEX_RANGE] = {
4, 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, 59, 60, 61, 62,
63, 64, 65, 66, 67, 68, 69, 70,
71, 72, 73, 74, 75, 76, 77, 78,
79, 80, 81, 82, 83, 84, 85, 86,
87, 88, 89, 90, 91, 92, 93, 94,
95, 96, 97, 98, 99, 100, 101, 102,
104, 106, 108, 110, 112, 114, 116, 118,
120, 122, 124, 126, 128, 130, 132, 134,
136, 138, 140, 142, 144, 146, 148, 150,
152, 155, 158, 161, 164, 167, 170, 173,
176, 179, 182, 185, 188, 191, 194, 197,
200, 203, 207, 211, 215, 219, 223, 227,
231, 235, 239, 243, 247, 251, 255, 260,
265, 270, 275, 280, 285, 290, 295, 300,
305, 311, 317, 323, 329, 335, 341, 347,
353, 359, 366, 373, 380, 387, 394, 401,
408, 416, 424, 432, 440, 448, 456, 465,
474, 483, 492, 501, 510, 520, 530, 540,
550, 560, 571, 582, 593, 604, 615, 627,
639, 651, 663, 676, 689, 702, 715, 729,
743, 757, 771, 786, 801, 816, 832, 848,
864, 881, 898, 915, 933, 951, 969, 988,
1007, 1026, 1046, 1066, 1087, 1108, 1129, 1151,
1173, 1196, 1219, 1243, 1267, 1292, 1317, 1343,
1369, 1396, 1423, 1451, 1479, 1508, 1537, 1567,
1597, 1628, 1660, 1692, 1725, 1759, 1793, 1828,
};
void vp9_init_quant_tables(void) { }
#else
static int16_t dc_qlookup[QINDEX_RANGE];
static int16_t ac_qlookup[QINDEX_RANGE];
#define ACDC_MIN 8
// TODO(dkovalev) move to common and reuse
static double poly3(double a, double b, double c, double d, double x) {
return a*x*x*x + b*x*x + c*x + d;
}
void vp9_init_quant_tables() {
int i, val = 4;
// A "real" q of 1.0 forces lossless mode.
// In practice non lossless Q's between 1.0 and 2.0 (represented here by
// integer values from 5-7 give poor rd results (lower psnr and often
// larger size than the lossless encode. To block out those "not very useful"
// values we increment the ac and dc q lookup values by 4 after position 0.
ac_qlookup[0] = val;
dc_qlookup[0] = val;
val += 4;
for (i = 1; i < QINDEX_RANGE; i++) {
const int ac_val = val;
val = (int)(val * 1.01975);
if (val == ac_val)
++val;
ac_qlookup[i] = (int16_t)ac_val;
dc_qlookup[i] = (int16_t)MAX(ACDC_MIN, poly3(0.000000305, -0.00065, 0.9,
0.5, ac_val));
}
}
#endif
int16_t vp9_dc_quant(int qindex, int delta) {
return dc_qlookup[clamp(qindex + delta, 0, MAXQ)];
}
int16_t vp9_ac_quant(int qindex, int delta) {
return ac_qlookup[clamp(qindex + delta, 0, MAXQ)];
}
int vp9_get_qindex(struct segmentation *seg, int segment_id, int base_qindex) {
if (vp9_segfeature_active(seg, segment_id, SEG_LVL_ALT_Q)) {
const int data = vp9_get_segdata(seg, segment_id, SEG_LVL_ALT_Q);
return seg->abs_delta == SEGMENT_ABSDATA ?
data : // Abs value
clamp(base_qindex + data, 0, MAXQ); // Delta value
} else {
return base_qindex;
}
}