/*

  * 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 */