187 lines
6.3 KiB
C
187 lines
6.3 KiB
C
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/*
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* AAC data declarations
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* Copyright (c) 2005-2006 Oded Shimon ( ods15 ods15 dyndns org )
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* Copyright (c) 2006-2007 Maxim Gavrilov ( maxim.gavrilov gmail com )
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* AAC data declarations
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* @author Oded Shimon ( ods15 ods15 dyndns org )
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* @author Maxim Gavrilov ( maxim.gavrilov gmail com )
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*/
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#ifndef AVCODEC_AACTAB_H
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#define AVCODEC_AACTAB_H
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#include "libavutil/mem.h"
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#include "aac.h"
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#include <stdint.h>
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/* NOTE:
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* Tables in this file are shared by the AAC decoders and encoder
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*/
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extern float ff_aac_pow2sf_tab[428];
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extern float ff_aac_pow34sf_tab[428];
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static inline void ff_aac_tableinit(void)
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{
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int i;
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/* 2^(i/16) for 0 <= i <= 15 */
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static const float exp2_lut[] = {
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1.00000000000000000000,
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1.04427378242741384032,
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1.09050773266525765921,
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1.13878863475669165370,
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1.18920711500272106672,
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1.24185781207348404859,
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1.29683955465100966593,
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1.35425554693689272830,
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1.41421356237309504880,
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1.47682614593949931139,
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1.54221082540794082361,
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1.61049033194925430818,
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1.68179283050742908606,
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1.75625216037329948311,
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1.83400808640934246349,
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1.91520656139714729387,
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};
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float t1 = 8.8817841970012523233890533447265625e-16; // 2^(-50)
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float t2 = 3.63797880709171295166015625e-12; // 2^(-38)
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int t1_inc_cur, t2_inc_cur;
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int t1_inc_prev = 0;
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int t2_inc_prev = 8;
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for (i = 0; i < 428; i++) {
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t1_inc_cur = 4 * (i % 4);
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t2_inc_cur = (8 + 3*i) % 16;
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if (t1_inc_cur < t1_inc_prev)
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t1 *= 2;
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if (t2_inc_cur < t2_inc_prev)
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t2 *= 2;
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// A much more efficient and accurate way of doing:
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// ff_aac_pow2sf_tab[i] = pow(2, (i - POW_SF2_ZERO) / 4.0);
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// ff_aac_pow34sf_tab[i] = pow(ff_aac_pow2sf_tab[i], 3.0/4.0);
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ff_aac_pow2sf_tab[i] = t1 * exp2_lut[t1_inc_cur];
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ff_aac_pow34sf_tab[i] = t2 * exp2_lut[t2_inc_cur];
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t1_inc_prev = t1_inc_cur;
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t2_inc_prev = t2_inc_cur;
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}
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}
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/* @name ltp_coef
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* Table of the LTP coefficients
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*/
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static const INTFLOAT ltp_coef[8] = {
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Q30(0.570829), Q30(0.696616), Q30(0.813004), Q30(0.911304),
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Q30(0.984900), Q30(1.067894), Q30(1.194601), Q30(1.369533),
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};
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/* @name tns_tmp2_map
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* Tables of the tmp2[] arrays of LPC coefficients used for TNS.
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* The suffix _M_N[] indicate the values of coef_compress and coef_res
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* respectively.
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* @{
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*/
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static const INTFLOAT tns_tmp2_map_1_3[4] = {
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Q31(0.00000000), Q31(-0.43388373), Q31(0.64278758), Q31(0.34202015),
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};
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static const INTFLOAT tns_tmp2_map_0_3[8] = {
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Q31(0.00000000), Q31(-0.43388373), Q31(-0.78183150), Q31(-0.97492790),
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Q31(0.98480773), Q31( 0.86602539), Q31( 0.64278758), Q31( 0.34202015),
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};
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static const INTFLOAT tns_tmp2_map_1_4[8] = {
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Q31(0.00000000), Q31(-0.20791170), Q31(-0.40673664), Q31(-0.58778524),
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Q31(0.67369562), Q31( 0.52643216), Q31( 0.36124167), Q31( 0.18374951),
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};
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static const INTFLOAT tns_tmp2_map_0_4[16] = {
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Q31( 0.00000000), Q31(-0.20791170), Q31(-0.40673664), Q31(-0.58778524),
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Q31(-0.74314481), Q31(-0.86602539), Q31(-0.95105654), Q31(-0.99452192),
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Q31( 0.99573416), Q31( 0.96182561), Q31( 0.89516330), Q31( 0.79801720),
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Q31( 0.67369562), Q31( 0.52643216), Q31( 0.36124167), Q31( 0.18374951),
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};
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static const INTFLOAT * const tns_tmp2_map[4] = {
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tns_tmp2_map_0_3,
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tns_tmp2_map_0_4,
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tns_tmp2_map_1_3,
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tns_tmp2_map_1_4
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};
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// @}
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/* @name window coefficients
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* @{
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*/
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DECLARE_ALIGNED(32, extern float, ff_aac_kbd_long_1024)[1024];
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DECLARE_ALIGNED(32, extern float, ff_aac_kbd_short_128)[128];
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DECLARE_ALIGNED(32, extern float, ff_aac_kbd_long_960)[960];
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DECLARE_ALIGNED(32, extern float, ff_aac_kbd_short_120)[120];
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DECLARE_ALIGNED(32, extern int, ff_aac_kbd_long_1024_fixed)[1024];
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DECLARE_ALIGNED(32, extern int, ff_aac_kbd_long_512_fixed)[512];
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DECLARE_ALIGNED(32, extern int, ff_aac_kbd_short_128_fixed)[128];
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DECLARE_ALIGNED(32, extern const float, ff_aac_eld_window_512)[1920];
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DECLARE_ALIGNED(32, extern const int, ff_aac_eld_window_512_fixed)[1920];
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DECLARE_ALIGNED(32, extern const float, ff_aac_eld_window_480)[1800];
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DECLARE_ALIGNED(32, extern const int, ff_aac_eld_window_480_fixed)[1800];
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// @}
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/* @name number of scalefactor window bands for long and short transform windows respectively
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* @{
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*/
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extern const uint8_t ff_aac_num_swb_1024[];
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extern const uint8_t ff_aac_num_swb_960 [];
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extern const uint8_t ff_aac_num_swb_512 [];
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extern const uint8_t ff_aac_num_swb_480 [];
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extern const uint8_t ff_aac_num_swb_128 [];
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extern const uint8_t ff_aac_num_swb_120 [];
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// @}
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extern const uint8_t ff_aac_pred_sfb_max [];
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extern const uint32_t ff_aac_scalefactor_code[121];
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extern const uint8_t ff_aac_scalefactor_bits[121];
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extern const uint16_t * const ff_aac_spectral_codes[11];
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extern const uint8_t * const ff_aac_spectral_bits [11];
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extern const uint16_t ff_aac_spectral_sizes[11];
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extern const float *ff_aac_codebook_vectors[];
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extern const float *ff_aac_codebook_vector_vals[];
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extern const uint16_t *ff_aac_codebook_vector_idx[];
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extern const uint16_t * const ff_swb_offset_1024[13];
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extern const uint16_t * const ff_swb_offset_960 [13];
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extern const uint16_t * const ff_swb_offset_512 [13];
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extern const uint16_t * const ff_swb_offset_480 [13];
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extern const uint16_t * const ff_swb_offset_128 [13];
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extern const uint16_t * const ff_swb_offset_120 [13];
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extern const uint8_t ff_tns_max_bands_1024[13];
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extern const uint8_t ff_tns_max_bands_512 [13];
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extern const uint8_t ff_tns_max_bands_480 [13];
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extern const uint8_t ff_tns_max_bands_128 [13];
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#endif /* AVCODEC_AACTAB_H */
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