1
2
3
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
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
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
/*
* AAC data declarations
* Copyright (c) 2005-2006 Oded Shimon ( ods15 ods15 dyndns org )
* Copyright (c) 2006-2007 Maxim Gavrilov ( maxim.gavrilov gmail com )
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* AAC data declarations
* @author Oded Shimon ( ods15 ods15 dyndns org )
* @author Maxim Gavrilov ( maxim.gavrilov gmail com )
*/
#ifndef AVCODEC_AACTAB_H
#define AVCODEC_AACTAB_H
#include "libavutil/mem.h"
#include "aac.h"
#include <stdint.h>
/* NOTE:
* Tables in this file are shared by the AAC decoders and encoder
*/
extern float ff_aac_pow2sf_tab[428];
extern float ff_aac_pow34sf_tab[428];
static inline void ff_aac_tableinit(void)
{
int i;
/* 2^(i/16) for 0 <= i <= 15 */
static const float exp2_lut[] = {
1.00000000000000000000,
1.04427378242741384032,
1.09050773266525765921,
1.13878863475669165370,
1.18920711500272106672,
1.24185781207348404859,
1.29683955465100966593,
1.35425554693689272830,
1.41421356237309504880,
1.47682614593949931139,
1.54221082540794082361,
1.61049033194925430818,
1.68179283050742908606,
1.75625216037329948311,
1.83400808640934246349,
1.91520656139714729387,
};
float t1 = 8.8817841970012523233890533447265625e-16; // 2^(-50)
float t2 = 3.63797880709171295166015625e-12; // 2^(-38)
int t1_inc_cur, t2_inc_cur;
int t1_inc_prev = 0;
int t2_inc_prev = 8;
for (i = 0; i < 428; i++) {
t1_inc_cur = 4 * (i % 4);
t2_inc_cur = (8 + 3*i) % 16;
if (t1_inc_cur < t1_inc_prev)
t1 *= 2;
if (t2_inc_cur < t2_inc_prev)
t2 *= 2;
// A much more efficient and accurate way of doing:
// ff_aac_pow2sf_tab[i] = pow(2, (i - POW_SF2_ZERO) / 4.0);
// ff_aac_pow34sf_tab[i] = pow(ff_aac_pow2sf_tab[i], 3.0/4.0);
ff_aac_pow2sf_tab[i] = t1 * exp2_lut[t1_inc_cur];
ff_aac_pow34sf_tab[i] = t2 * exp2_lut[t2_inc_cur];
t1_inc_prev = t1_inc_cur;
t2_inc_prev = t2_inc_cur;
}
}
/* @name ltp_coef
* Table of the LTP coefficients
*/
static const INTFLOAT ltp_coef[8] = {
Q30(0.570829), Q30(0.696616), Q30(0.813004), Q30(0.911304),
Q30(0.984900), Q30(1.067894), Q30(1.194601), Q30(1.369533),
};
/* @name tns_tmp2_map
* Tables of the tmp2[] arrays of LPC coefficients used for TNS.
* The suffix _M_N[] indicate the values of coef_compress and coef_res
* respectively.
* @{
*/
static const INTFLOAT tns_tmp2_map_1_3[4] = {
Q31(0.00000000), Q31(-0.43388373), Q31(0.64278758), Q31(0.34202015),
};
static const INTFLOAT tns_tmp2_map_0_3[8] = {
Q31(0.00000000), Q31(-0.43388373), Q31(-0.78183150), Q31(-0.97492790),
Q31(0.98480773), Q31( 0.86602539), Q31( 0.64278758), Q31( 0.34202015),
};
static const INTFLOAT tns_tmp2_map_1_4[8] = {
Q31(0.00000000), Q31(-0.20791170), Q31(-0.40673664), Q31(-0.58778524),
Q31(0.67369562), Q31( 0.52643216), Q31( 0.36124167), Q31( 0.18374951),
};
static const INTFLOAT tns_tmp2_map_0_4[16] = {
Q31( 0.00000000), Q31(-0.20791170), Q31(-0.40673664), Q31(-0.58778524),
Q31(-0.74314481), Q31(-0.86602539), Q31(-0.95105654), Q31(-0.99452192),
Q31( 0.99573416), Q31( 0.96182561), Q31( 0.89516330), Q31( 0.79801720),
Q31( 0.67369562), Q31( 0.52643216), Q31( 0.36124167), Q31( 0.18374951),
};
static const INTFLOAT * const tns_tmp2_map[4] = {
tns_tmp2_map_0_3,
tns_tmp2_map_0_4,
tns_tmp2_map_1_3,
tns_tmp2_map_1_4
};
// @}
/* @name window coefficients
* @{
*/
DECLARE_ALIGNED(32, extern float, ff_aac_kbd_long_1024)[1024];
DECLARE_ALIGNED(32, extern float, ff_aac_kbd_short_128)[128];
DECLARE_ALIGNED(32, extern int, ff_aac_kbd_long_1024_fixed)[1024];
DECLARE_ALIGNED(32, extern int, ff_aac_kbd_long_512_fixed)[512];
DECLARE_ALIGNED(32, extern int, ff_aac_kbd_short_128_fixed)[128];
DECLARE_ALIGNED(32, extern const float, ff_aac_eld_window_512)[1920];
DECLARE_ALIGNED(32, extern const int, ff_aac_eld_window_512_fixed)[1920];
DECLARE_ALIGNED(32, extern const float, ff_aac_eld_window_480)[1800];
DECLARE_ALIGNED(32, extern const int, ff_aac_eld_window_480_fixed)[1800];
// @}
/* @name number of scalefactor window bands for long and short transform windows respectively
* @{
*/
extern const uint8_t ff_aac_num_swb_1024[];
extern const uint8_t ff_aac_num_swb_512 [];
extern const uint8_t ff_aac_num_swb_480 [];
extern const uint8_t ff_aac_num_swb_128 [];
// @}
extern const uint8_t ff_aac_pred_sfb_max [];
extern const uint32_t ff_aac_scalefactor_code[121];
extern const uint8_t ff_aac_scalefactor_bits[121];
extern const uint16_t * const ff_aac_spectral_codes[11];
extern const uint8_t * const ff_aac_spectral_bits [11];
extern const uint16_t ff_aac_spectral_sizes[11];
extern const float *ff_aac_codebook_vectors[];
extern const float *ff_aac_codebook_vector_vals[];
extern const uint16_t *ff_aac_codebook_vector_idx[];
extern const uint16_t * const ff_swb_offset_1024[13];
extern const uint16_t * const ff_swb_offset_512 [13];
extern const uint16_t * const ff_swb_offset_480 [13];
extern const uint16_t * const ff_swb_offset_128 [13];
extern const uint8_t ff_tns_max_bands_1024[13];
extern const uint8_t ff_tns_max_bands_512 [13];
extern const uint8_t ff_tns_max_bands_480 [13];
extern const uint8_t ff_tns_max_bands_128 [13];
#endif /* AVCODEC_AACTAB_H */
|
