blob: 48ca0fd16387533666156696d679f54397235027
| 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 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 | DECLARE_ALIGNED(32, extern const float, ff_aac_eld_window_512)[1920]; |
| 143 | DECLARE_ALIGNED(32, extern const int, ff_aac_eld_window_512_fixed)[1920]; |
| 144 | DECLARE_ALIGNED(32, extern const float, ff_aac_eld_window_480)[1800]; |
| 145 | DECLARE_ALIGNED(32, extern const int, ff_aac_eld_window_480_fixed)[1800]; |
| 146 | // @} |
| 147 | |
| 148 | /* @name number of scalefactor window bands for long and short transform windows respectively |
| 149 | * @{ |
| 150 | */ |
| 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 []; |
| 155 | // @} |
| 156 | |
| 157 | extern const uint8_t ff_aac_pred_sfb_max []; |
| 158 | |
| 159 | extern const uint32_t ff_aac_scalefactor_code[121]; |
| 160 | extern const uint8_t ff_aac_scalefactor_bits[121]; |
| 161 | |
| 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]; |
| 165 | |
| 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[]; |
| 169 | |
| 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]; |
| 174 | |
| 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]; |
| 179 | |
| 180 | #endif /* AVCODEC_AACTAB_H */ |
| 181 |