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- /*
- * 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 float, ff_aac_kbd_long_960)[960];
- DECLARE_ALIGNED(32, extern float, ff_aac_kbd_short_120)[120];
- 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_960 [];
- 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_num_swb_120 [];
- // @}
- 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_960 [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 uint16_t * const ff_swb_offset_120 [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 */
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