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 )
6 * This file is part of FFmpeg.
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.
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.
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
25 * AAC data declarations
26 * @author Oded Shimon ( ods15 ods15 dyndns org )
27 * @author Maxim Gavrilov ( maxim.gavrilov gmail com )
30 #ifndef AVCODEC_AACTAB_H
31 #define AVCODEC_AACTAB_H
33 #include "libavutil/mem.h"
39 * Tables in this file are shared by the AAC decoders and encoder
42 extern float ff_aac_pow2sf_tab[428];
43 extern float ff_aac_pow34sf_tab[428];
45 static inline void ff_aac_tableinit(void)
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,
68 float t1 = 8.8817841970012523233890533447265625e-16; // 2^(-50)
69 float t2 = 3.63797880709171295166015625e-12; // 2^(-38)
70 int t1_inc_cur, t2_inc_cur;
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)
79 if (t2_inc_cur < t2_inc_prev)
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;
92 * Table of the LTP coefficients
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),
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
105 static const INTFLOAT tns_tmp2_map_1_3[4] = {
106 Q31(0.00000000), Q31(-0.43388373), Q31(0.64278758), Q31(0.34202015),
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),
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),
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),
126 static const INTFLOAT * const tns_tmp2_map[4] = {
134 /* @name window coefficients
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 int, ff_aac_kbd_long_1024_fixed)[1024];
140 DECLARE_ALIGNED(32, extern int, ff_aac_kbd_long_512_fixed)[512];
141 DECLARE_ALIGNED(32, extern int, ff_aac_kbd_short_128_fixed)[128];
142 const DECLARE_ALIGNED(32, extern float, ff_aac_eld_window_512)[1920];
143 const DECLARE_ALIGNED(32, extern int, ff_aac_eld_window_512_fixed)[1920];
144 const DECLARE_ALIGNED(32, extern float, ff_aac_eld_window_480)[1800];
145 const DECLARE_ALIGNED(32, extern int, ff_aac_eld_window_480_fixed)[1800];
148 /* @name number of scalefactor window bands for long and short transform windows respectively
151 extern const uint8_t ff_aac_num_swb_1024[];
152 extern const uint8_t ff_aac_num_swb_512 [];
153 extern const uint8_t ff_aac_num_swb_480 [];
154 extern const uint8_t ff_aac_num_swb_128 [];
157 extern const uint8_t ff_aac_pred_sfb_max [];
159 extern const uint32_t ff_aac_scalefactor_code[121];
160 extern const uint8_t ff_aac_scalefactor_bits[121];
162 extern const uint16_t * const ff_aac_spectral_codes[11];
163 extern const uint8_t * const ff_aac_spectral_bits [11];
164 extern const uint16_t ff_aac_spectral_sizes[11];
166 extern const float *ff_aac_codebook_vectors[];
167 extern const float *ff_aac_codebook_vector_vals[];
168 extern const uint16_t *ff_aac_codebook_vector_idx[];
170 extern const uint16_t * const ff_swb_offset_1024[13];
171 extern const uint16_t * const ff_swb_offset_512 [13];
172 extern const uint16_t * const ff_swb_offset_480 [13];
173 extern const uint16_t * const ff_swb_offset_128 [13];
175 extern const uint8_t ff_tns_max_bands_1024[13];
176 extern const uint8_t ff_tns_max_bands_512 [13];
177 extern const uint8_t ff_tns_max_bands_480 [13];
178 extern const uint8_t ff_tns_max_bands_128 [13];
180 #endif /* AVCODEC_AACTAB_H */