FFmpeg
aactab.h
Go to the documentation of this file.
1 /*
2  * AAC data declarations
3  * Copyright (c) 2005-2006 Oded Shimon ( ods15 ods15 dyndns org )
4  * Copyright (c) 2006-2007 Maxim Gavrilov ( maxim.gavrilov gmail com )
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 /**
24  * @file
25  * AAC data declarations
26  * @author Oded Shimon ( ods15 ods15 dyndns org )
27  * @author Maxim Gavrilov ( maxim.gavrilov gmail com )
28  */
29 
30 #ifndef AVCODEC_AACTAB_H
31 #define AVCODEC_AACTAB_H
32 
33 #include "libavutil/mem.h"
34 #include "aac.h"
35 
36 #include <stdint.h>
37 
38 /* NOTE:
39  * Tables in this file are shared by the AAC decoders and encoder
40  */
41 
42 extern float ff_aac_pow2sf_tab[428];
43 extern float ff_aac_pow34sf_tab[428];
44 
45 static inline void ff_aac_tableinit(void)
46 {
47  int i;
48 
49  /* 2^(i/16) for 0 <= i <= 15 */
50  static const float exp2_lut[] = {
51  1.00000000000000000000,
52  1.04427378242741384032,
53  1.09050773266525765921,
54  1.13878863475669165370,
55  1.18920711500272106672,
56  1.24185781207348404859,
57  1.29683955465100966593,
58  1.35425554693689272830,
59  1.41421356237309504880,
60  1.47682614593949931139,
61  1.54221082540794082361,
62  1.61049033194925430818,
63  1.68179283050742908606,
64  1.75625216037329948311,
65  1.83400808640934246349,
66  1.91520656139714729387,
67  };
68  float t1 = 8.8817841970012523233890533447265625e-16; // 2^(-50)
69  float t2 = 3.63797880709171295166015625e-12; // 2^(-38)
70  int t1_inc_cur, t2_inc_cur;
71  int t1_inc_prev = 0;
72  int t2_inc_prev = 8;
73 
74  for (i = 0; i < 428; i++) {
75  t1_inc_cur = 4 * (i % 4);
76  t2_inc_cur = (8 + 3*i) % 16;
77  if (t1_inc_cur < t1_inc_prev)
78  t1 *= 2;
79  if (t2_inc_cur < t2_inc_prev)
80  t2 *= 2;
81  // A much more efficient and accurate way of doing:
82  // ff_aac_pow2sf_tab[i] = pow(2, (i - POW_SF2_ZERO) / 4.0);
83  // ff_aac_pow34sf_tab[i] = pow(ff_aac_pow2sf_tab[i], 3.0/4.0);
84  ff_aac_pow2sf_tab[i] = t1 * exp2_lut[t1_inc_cur];
85  ff_aac_pow34sf_tab[i] = t2 * exp2_lut[t2_inc_cur];
86  t1_inc_prev = t1_inc_cur;
87  t2_inc_prev = t2_inc_cur;
88  }
89 }
90 
91 /* @name ltp_coef
92  * Table of the LTP coefficients
93  */
94 static const INTFLOAT ltp_coef[8] = {
95  Q30(0.570829), Q30(0.696616), Q30(0.813004), Q30(0.911304),
96  Q30(0.984900), Q30(1.067894), Q30(1.194601), Q30(1.369533),
97 };
98 
99 /* @name tns_tmp2_map
100  * Tables of the tmp2[] arrays of LPC coefficients used for TNS.
101  * The suffix _M_N[] indicate the values of coef_compress and coef_res
102  * respectively.
103  * @{
104  */
105 static const INTFLOAT tns_tmp2_map_1_3[4] = {
106  Q31(0.00000000), Q31(-0.43388373), Q31(0.64278758), Q31(0.34202015),
107 };
108 
109 static const INTFLOAT tns_tmp2_map_0_3[8] = {
110  Q31(0.00000000), Q31(-0.43388373), Q31(-0.78183150), Q31(-0.97492790),
111  Q31(0.98480773), Q31( 0.86602539), Q31( 0.64278758), Q31( 0.34202015),
112 };
113 
114 static const INTFLOAT tns_tmp2_map_1_4[8] = {
115  Q31(0.00000000), Q31(-0.20791170), Q31(-0.40673664), Q31(-0.58778524),
116  Q31(0.67369562), Q31( 0.52643216), Q31( 0.36124167), Q31( 0.18374951),
117 };
118 
119 static const INTFLOAT tns_tmp2_map_0_4[16] = {
120  Q31( 0.00000000), Q31(-0.20791170), Q31(-0.40673664), Q31(-0.58778524),
121  Q31(-0.74314481), Q31(-0.86602539), Q31(-0.95105654), Q31(-0.99452192),
122  Q31( 0.99573416), Q31( 0.96182561), Q31( 0.89516330), Q31( 0.79801720),
123  Q31( 0.67369562), Q31( 0.52643216), Q31( 0.36124167), Q31( 0.18374951),
124 };
125 
126 static const INTFLOAT * const tns_tmp2_map[4] = {
127  tns_tmp2_map_0_3,
128  tns_tmp2_map_0_4,
129  tns_tmp2_map_1_3,
130  tns_tmp2_map_1_4
131 };
132 // @}
133 
134 /* @name window coefficients
135  * @{
136  */
137 DECLARE_ALIGNED(32, extern float, ff_aac_kbd_long_1024)[1024];
138 DECLARE_ALIGNED(32, extern float, ff_aac_kbd_short_128)[128];
139 DECLARE_ALIGNED(32, extern float, ff_aac_kbd_long_960)[960];
140 DECLARE_ALIGNED(32, extern float, ff_aac_kbd_short_120)[120];
141 DECLARE_ALIGNED(32, extern int, ff_aac_kbd_long_1024_fixed)[1024];
142 DECLARE_ALIGNED(32, extern int, ff_aac_kbd_long_512_fixed)[512];
143 DECLARE_ALIGNED(32, extern int, ff_aac_kbd_short_128_fixed)[128];
144 DECLARE_ALIGNED(32, extern const float, ff_aac_eld_window_512)[1920];
145 DECLARE_ALIGNED(32, extern const int, ff_aac_eld_window_512_fixed)[1920];
146 DECLARE_ALIGNED(32, extern const float, ff_aac_eld_window_480)[1800];
147 DECLARE_ALIGNED(32, extern const int, ff_aac_eld_window_480_fixed)[1800];
148 // @}
149 
150 /* @name number of scalefactor window bands for long and short transform windows respectively
151  * @{
152  */
153 extern const uint8_t ff_aac_num_swb_1024[];
154 extern const uint8_t ff_aac_num_swb_960 [];
155 extern const uint8_t ff_aac_num_swb_512 [];
156 extern const uint8_t ff_aac_num_swb_480 [];
157 extern const uint8_t ff_aac_num_swb_128 [];
158 extern const uint8_t ff_aac_num_swb_120 [];
159 // @}
160 
161 extern const uint8_t ff_aac_pred_sfb_max [];
162 
163 extern const uint32_t ff_aac_scalefactor_code[121];
164 extern const uint8_t ff_aac_scalefactor_bits[121];
165 
166 extern const uint16_t * const ff_aac_spectral_codes[11];
167 extern const uint8_t * const ff_aac_spectral_bits [11];
168 extern const uint16_t ff_aac_spectral_sizes[11];
169 
170 extern const float *ff_aac_codebook_vectors[];
171 extern const float *ff_aac_codebook_vector_vals[];
172 extern const uint16_t *ff_aac_codebook_vector_idx[];
173 
174 extern const uint16_t * const ff_swb_offset_1024[13];
175 extern const uint16_t * const ff_swb_offset_960 [13];
176 extern const uint16_t * const ff_swb_offset_512 [13];
177 extern const uint16_t * const ff_swb_offset_480 [13];
178 extern const uint16_t * const ff_swb_offset_128 [13];
179 extern const uint16_t * const ff_swb_offset_120 [13];
180 
181 extern const uint8_t ff_tns_max_bands_1024[13];
182 extern const uint8_t ff_tns_max_bands_512 [13];
183 extern const uint8_t ff_tns_max_bands_480 [13];
184 extern const uint8_t ff_tns_max_bands_128 [13];
185 
186 #endif /* AVCODEC_AACTAB_H */
ff_aac_pred_sfb_max
const uint8_t ff_aac_pred_sfb_max[]
Definition: aactab.c:69
ff_aac_kbd_short_128
float ff_aac_kbd_short_128[128]
Definition: aactab.c:39
ff_swb_offset_1024
const uint16_t *const ff_swb_offset_1024[13]
Definition: aactab.c:1336
ff_aac_num_swb_960
const uint8_t ff_aac_num_swb_960[]
Definition: aactab.c:49
ff_aac_spectral_codes
const uint16_t *const ff_aac_spectral_codes[11]
Definition: aactab.c:417
ff_aac_tableinit
static void ff_aac_tableinit(void)
Definition: aactab.h:45
t1
#define t1
Definition: regdef.h:29
ff_aac_eld_window_512_fixed
const int ff_aac_eld_window_512_fixed[1920]
Definition: aactab.c:1895
ff_aac_eld_window_512
const float ff_aac_eld_window_512[1920]
Definition: aactab.c:1411
ff_aac_spectral_sizes
const uint16_t ff_aac_spectral_sizes[11]
Definition: aactab.c:427
ltp_coef
static const INTFLOAT ltp_coef[8]
Definition: aactab.h:94
ff_swb_offset_960
const uint16_t *const ff_swb_offset_960[13]
Definition: aactab.c:1344
ff_aac_num_swb_480
const uint8_t ff_aac_num_swb_480[]
Definition: aactab.c:57
ff_aac_scalefactor_code
const uint32_t ff_aac_scalefactor_code[121]
Definition: aactab.c:73
ff_tns_max_bands_128
const uint8_t ff_tns_max_bands_128[13]
Definition: aactab.c:1406
ff_tns_max_bands_1024
const uint8_t ff_tns_max_bands_1024[13]
Definition: aactab.c:1394
tns_tmp2_map_1_3
static const INTFLOAT tns_tmp2_map_1_3[4]
Definition: aactab.h:105
ff_tns_max_bands_512
const uint8_t ff_tns_max_bands_512[13]
Definition: aactab.c:1398
ff_aac_kbd_short_128_fixed
int ff_aac_kbd_short_128_fixed[128]
Definition: aactab.c:43
ff_aac_num_swb_120
const uint8_t ff_aac_num_swb_120[]
Definition: aactab.c:65
ff_aac_kbd_long_512_fixed
int ff_aac_kbd_long_512_fixed[512]
ff_aac_eld_window_480_fixed
const int ff_aac_eld_window_480_fixed[1800]
Definition: aactab.c:2831
aac.h
tns_tmp2_map_0_4
static const INTFLOAT tns_tmp2_map_0_4[16]
Definition: aactab.h:119
ff_aac_codebook_vector_vals
const float * ff_aac_codebook_vector_vals[]
Definition: aactab.c:1074
ff_aac_pow34sf_tab
float ff_aac_pow34sf_tab[428]
Definition: aactab.c:36
ff_aac_kbd_long_960
float ff_aac_kbd_long_960[960]
Definition: aactab.c:40
ff_tns_max_bands_480
const uint8_t ff_tns_max_bands_480[13]
Definition: aactab.c:1402
tns_tmp2_map_1_4
static const INTFLOAT tns_tmp2_map_1_4[8]
Definition: aactab.h:114
ff_aac_scalefactor_bits
const uint8_t ff_aac_scalefactor_bits[121]
Definition: aactab.c:92
ff_aac_num_swb_128
const uint8_t ff_aac_num_swb_128[]
Definition: aactab.c:61
ff_swb_offset_128
const uint16_t *const ff_swb_offset_128[13]
Definition: aactab.c:1368
ff_aac_spectral_bits
const uint8_t *const ff_aac_spectral_bits[11]
Definition: aactab.c:422
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:112
ff_swb_offset_512
const uint16_t *const ff_swb_offset_512[13]
Definition: aactab.c:1352
ff_swb_offset_480
const uint16_t *const ff_swb_offset_480[13]
Definition: aactab.c:1360
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
uint8_t
uint8_t
Definition: audio_convert.c:194
ff_aac_kbd_long_1024
float ff_aac_kbd_long_1024[1024]
Definition: aactab.c:38
ff_aac_num_swb_512
const uint8_t ff_aac_num_swb_512[]
Definition: aactab.c:53
ff_aac_codebook_vectors
const float * ff_aac_codebook_vectors[]
Definition: aactab.c:918
ff_swb_offset_120
const uint16_t *const ff_swb_offset_120[13]
Definition: aactab.c:1378
ff_aac_eld_window_480
const float ff_aac_eld_window_480[1800]
Definition: aactab.c:2378
t2
#define t2
Definition: regdef.h:30
Q31
#define Q31(x)
Definition: aac_defines.h:96
mem.h
ff_aac_kbd_short_120
float ff_aac_kbd_short_120[120]
Definition: aactab.c:41
ff_aac_num_swb_1024
const uint8_t ff_aac_num_swb_1024[]
Definition: aactab.c:45
ff_aac_codebook_vector_idx
const uint16_t * ff_aac_codebook_vector_idx[]
Definition: aactab.c:1083
ff_aac_kbd_long_1024_fixed
int ff_aac_kbd_long_1024_fixed[1024]
Definition: aactab.c:42
tns_tmp2_map
static const INTFLOAT *const tns_tmp2_map[4]
Definition: aactab.h:126
ff_aac_pow2sf_tab
float ff_aac_pow2sf_tab[428]
Definition: aactab.c:35
tns_tmp2_map_0_3
static const INTFLOAT tns_tmp2_map_0_3[8]
Definition: aactab.h:109
INTFLOAT
float INTFLOAT
Definition: aac_defines.h:86
Q30
#define Q30(x)
Definition: aac_defines.h:95
Generated on Wed Aug 24 2022 21:31:06 for FFmpeg by   doxygen 1.8.17