LCOV - code coverage report
Current view: top level - libavcodec - aactab.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 17 17 100.0 %
Date: 2017-12-15 18:13:28 Functions: 1 1 100.0 %

          Line data    Source code
       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         172 : 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         172 :     float t1 = 8.8817841970012523233890533447265625e-16; // 2^(-50)
      69         172 :     float t2 = 3.63797880709171295166015625e-12; // 2^(-38)
      70             :     int t1_inc_cur, t2_inc_cur;
      71         172 :     int t1_inc_prev = 0;
      72         172 :     int t2_inc_prev = 8;
      73             : 
      74       73788 :     for (i = 0; i < 428; i++) {
      75       73616 :         t1_inc_cur = 4 * (i % 4);
      76       73616 :         t2_inc_cur = (8 + 3*i) % 16;
      77       73616 :         if (t1_inc_cur < t1_inc_prev)
      78       18232 :             t1 *= 2;
      79       73616 :         if (t2_inc_cur < t2_inc_prev)
      80       13760 :             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       73616 :         ff_aac_pow2sf_tab[i] = t1 * exp2_lut[t1_inc_cur];
      85       73616 :         ff_aac_pow34sf_tab[i] = t2 * exp2_lut[t2_inc_cur];
      86       73616 :         t1_inc_prev = t1_inc_cur;
      87       73616 :         t2_inc_prev = t2_inc_cur;
      88             :     }
      89         172 : }
      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 float,  ff_aac_kbd_long_960)[960];
     140             : DECLARE_ALIGNED(32, extern float,  ff_aac_kbd_short_120)[120];
     141             : DECLARE_ALIGNED(32, extern int,    ff_aac_kbd_long_1024_fixed)[1024];
     142             : DECLARE_ALIGNED(32, extern int,    ff_aac_kbd_long_512_fixed)[512];
     143             : DECLARE_ALIGNED(32, extern int,    ff_aac_kbd_short_128_fixed)[128];
     144             : DECLARE_ALIGNED(32, extern const float, ff_aac_eld_window_512)[1920];
     145             : DECLARE_ALIGNED(32, extern const int,   ff_aac_eld_window_512_fixed)[1920];
     146             : DECLARE_ALIGNED(32, extern const float, ff_aac_eld_window_480)[1800];
     147             : DECLARE_ALIGNED(32, extern const int,   ff_aac_eld_window_480_fixed)[1800];
     148             : // @}
     149             : 
     150             : /* @name number of scalefactor window bands for long and short transform windows respectively
     151             :  * @{
     152             :  */
     153             : extern const uint8_t ff_aac_num_swb_1024[];
     154             : extern const uint8_t ff_aac_num_swb_960 [];
     155             : extern const uint8_t ff_aac_num_swb_512 [];
     156             : extern const uint8_t ff_aac_num_swb_480 [];
     157             : extern const uint8_t ff_aac_num_swb_128 [];
     158             : extern const uint8_t ff_aac_num_swb_120 [];
     159             : // @}
     160             : 
     161             : extern const uint8_t ff_aac_pred_sfb_max [];
     162             : 
     163             : extern const uint32_t ff_aac_scalefactor_code[121];
     164             : extern const uint8_t  ff_aac_scalefactor_bits[121];
     165             : 
     166             : extern const uint16_t * const ff_aac_spectral_codes[11];
     167             : extern const uint8_t  * const ff_aac_spectral_bits [11];
     168             : extern const uint16_t  ff_aac_spectral_sizes[11];
     169             : 
     170             : extern const float *ff_aac_codebook_vectors[];
     171             : extern const float *ff_aac_codebook_vector_vals[];
     172             : extern const uint16_t *ff_aac_codebook_vector_idx[];
     173             : 
     174             : extern const uint16_t * const ff_swb_offset_1024[13];
     175             : extern const uint16_t * const ff_swb_offset_960 [13];
     176             : extern const uint16_t * const ff_swb_offset_512 [13];
     177             : extern const uint16_t * const ff_swb_offset_480 [13];
     178             : extern const uint16_t * const ff_swb_offset_128 [13];
     179             : extern const uint16_t * const ff_swb_offset_120 [13];
     180             : 
     181             : extern const uint8_t ff_tns_max_bands_1024[13];
     182             : extern const uint8_t ff_tns_max_bands_512 [13];
     183             : extern const uint8_t ff_tns_max_bands_480 [13];
     184             : extern const uint8_t ff_tns_max_bands_128 [13];
     185             : 
     186             : #endif /* AVCODEC_AACTAB_H */

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