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  1. /*
  2.  * AAC decoder data
  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 decoder data
  26.  * @author Oded Shimon  ( ods15 ods15 dyndns org )
  27.  * @author Maxim Gavrilov ( maxim.gavrilov gmail com )
  28.  */
  29.  
  30. #ifndef AVCODEC_AACDECTAB_H
  31. #define AVCODEC_AACDECTAB_H
  32.  
  33. #include "libavutil/channel_layout.h"
  34. #include "aac.h"
  35.  
  36. #include <stdint.h>
  37.  
  38. /* @name ltp_coef
  39.  * Table of the LTP coefficients
  40.  */
  41. static const float ltp_coef[8] = {
  42.     0.570829, 0.696616, 0.813004, 0.911304,
  43.     0.984900, 1.067894, 1.194601, 1.369533,
  44. };
  45.  
  46. /* @name tns_tmp2_map
  47.  * Tables of the tmp2[] arrays of LPC coefficients used for TNS.
  48.  * The suffix _M_N[] indicate the values of coef_compress and coef_res
  49.  * respectively.
  50.  * @{
  51.  */
  52. static const float tns_tmp2_map_1_3[4] = {
  53.      0.00000000, -0.43388373,  0.64278758,  0.34202015,
  54. };
  55.  
  56. static const float tns_tmp2_map_0_3[8] = {
  57.      0.00000000, -0.43388373, -0.78183150, -0.97492790,
  58.      0.98480773,  0.86602539,  0.64278758,  0.34202015,
  59. };
  60.  
  61. static const float tns_tmp2_map_1_4[8] = {
  62.      0.00000000, -0.20791170, -0.40673664, -0.58778524,
  63.      0.67369562,  0.52643216,  0.36124167,  0.18374951,
  64. };
  65.  
  66. static const float tns_tmp2_map_0_4[16] = {
  67.      0.00000000, -0.20791170, -0.40673664, -0.58778524,
  68.     -0.74314481, -0.86602539, -0.95105654, -0.99452192,
  69.      0.99573416,  0.96182561,  0.89516330,  0.79801720,
  70.      0.67369562,  0.52643216,  0.36124167,  0.18374951,
  71. };
  72.  
  73. static const float * const tns_tmp2_map[4] = {
  74.     tns_tmp2_map_0_3,
  75.     tns_tmp2_map_0_4,
  76.     tns_tmp2_map_1_3,
  77.     tns_tmp2_map_1_4
  78. };
  79. // @}
  80.  
  81. static const int8_t tags_per_config[16] = { 0, 1, 1, 2, 3, 3, 4, 5, 0, 0, 0, 0, 0, 0, 0, 0 };
  82.  
  83. static const uint8_t aac_channel_layout_map[7][5][3] = {
  84.     { { TYPE_SCE, 0, AAC_CHANNEL_FRONT }, },
  85.     { { TYPE_CPE, 0, AAC_CHANNEL_FRONT }, },
  86.     { { TYPE_SCE, 0, AAC_CHANNEL_FRONT }, { TYPE_CPE, 0, AAC_CHANNEL_FRONT }, },
  87.     { { TYPE_SCE, 0, AAC_CHANNEL_FRONT }, { TYPE_CPE, 0, AAC_CHANNEL_FRONT }, { TYPE_SCE, 1, AAC_CHANNEL_BACK }, },
  88.     { { TYPE_SCE, 0, AAC_CHANNEL_FRONT }, { TYPE_CPE, 0, AAC_CHANNEL_FRONT }, { TYPE_CPE, 1, AAC_CHANNEL_BACK }, },
  89.     { { TYPE_SCE, 0, AAC_CHANNEL_FRONT }, { TYPE_CPE, 0, AAC_CHANNEL_FRONT }, { TYPE_CPE, 1, AAC_CHANNEL_BACK }, { TYPE_LFE, 0, AAC_CHANNEL_LFE  }, },
  90.     { { TYPE_SCE, 0, AAC_CHANNEL_FRONT }, { TYPE_CPE, 0, AAC_CHANNEL_FRONT }, { TYPE_CPE, 1, AAC_CHANNEL_FRONT }, { TYPE_CPE, 2, AAC_CHANNEL_BACK }, { TYPE_LFE, 0, AAC_CHANNEL_LFE  }, },
  91. };
  92.  
  93. static const uint64_t aac_channel_layout[8] = {
  94.     AV_CH_LAYOUT_MONO,
  95.     AV_CH_LAYOUT_STEREO,
  96.     AV_CH_LAYOUT_SURROUND,
  97.     AV_CH_LAYOUT_4POINT0,
  98.     AV_CH_LAYOUT_5POINT0_BACK,
  99.     AV_CH_LAYOUT_5POINT1_BACK,
  100.     AV_CH_LAYOUT_7POINT1_WIDE_BACK,
  101.     0,
  102. };
  103.  
  104. #endif /* AVCODEC_AACDECTAB_H */
  105.