/* * 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];const DECLARE_ALIGNED(32, extern float, ff_aac_eld_window_512)[1920];const DECLARE_ALIGNED(32, extern int,   ff_aac_eld_window_512_fixed)[1920];const DECLARE_ALIGNED(32, extern float, ff_aac_eld_window_480)[1800];const DECLARE_ALIGNED(32, extern 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 */