libavcodec/aacdectab.h

   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 libavcodec/aacdectab.h
  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 "aac.h"
  34
  35 #include <stdint.h>
  36
  37 /* @name swb_offsets
  38  * Sample offset into the window indicating the beginning of a scalefactor
  39  * window band
  40  *
  41  * scalefactor window band - term for scalefactor bands within a window,
  42  * given in Table 4.110 to Table 4.128.
  43  *
  44  * scalefactor band - a set of spectral coefficients which are scaled by one
  45  * scalefactor. In case of EIGHT_SHORT_SEQUENCE and grouping a scalefactor band
  46  * may contain several scalefactor window bands of corresponding frequency. For
  47  * all other window_sequences scalefactor bands and scalefactor window bands are
  48  * identical.
  49  * @{
  50  */
  51
  52 static const uint16_t swb_offset_1024_96[] = {
  53       0,   4,   8,  12,  16,  20,  24,  28,
  54      32,  36,  40,  44,  48,  52,  56,  64,
  55      72,  80,  88,  96, 108, 120, 132, 144,
  56     156, 172, 188, 212, 240, 276, 320, 384,
  57     448, 512, 576, 640, 704, 768, 832, 896,
  58     960, 1024
  59 };
  60
  61 static const uint16_t swb_offset_128_96[] = {
  62     0, 4, 8, 12, 16, 20, 24, 32, 40, 48, 64, 92, 128
  63 };
  64
  65 static const uint16_t swb_offset_1024_64[] = {
  66       0,   4,   8,  12,  16,  20,  24,  28,
  67      32,  36,  40,  44,  48,  52,  56,  64,
  68      72,  80,  88, 100, 112, 124, 140, 156,
  69     172, 192, 216, 240, 268, 304, 344, 384,
  70     424, 464, 504, 544, 584, 624, 664, 704,
  71     744, 784, 824, 864, 904, 944, 984, 1024
  72 };
  73
  74 static const uint16_t swb_offset_1024_48[] = {
  75       0,   4,   8,  12,  16,  20,  24,  28,
  76      32,  36,  40,  48,  56,  64,  72,  80,
  77      88,  96, 108, 120, 132, 144, 160, 176,
  78     196, 216, 240, 264, 292, 320, 352, 384,
  79     416, 448, 480, 512, 544, 576, 608, 640,
  80     672, 704, 736, 768, 800, 832, 864, 896,
  81     928, 1024
  82 };
  83
  84 static const uint16_t swb_offset_128_48[] = {
  85      0,   4,   8,  12,  16,  20,  28,  36,
  86     44,  56,  68,  80,  96, 112, 128
  87 };
  88
  89 static const uint16_t swb_offset_1024_32[] = {
  90       0,   4,   8,  12,  16,  20,  24,  28,
  91      32,  36,  40,  48,  56,  64,  72,  80,
  92      88,  96, 108, 120, 132, 144, 160, 176,
  93     196, 216, 240, 264, 292, 320, 352, 384,
  94     416, 448, 480, 512, 544, 576, 608, 640,
  95     672, 704, 736, 768, 800, 832, 864, 896,
  96     928, 960, 992, 1024
  97 };
  98
  99 static const uint16_t swb_offset_1024_24[] = {
 100       0,   4,   8,  12,  16,  20,  24,  28,
 101      32,  36,  40,  44,  52,  60,  68,  76,
 102      84,  92, 100, 108, 116, 124, 136, 148,
 103     160, 172, 188, 204, 220, 240, 260, 284,
 104     308, 336, 364, 396, 432, 468, 508, 552,
 105     600, 652, 704, 768, 832, 896, 960, 1024
 106 };
 107
 108 static const uint16_t swb_offset_128_24[] = {
 109      0,   4,   8,  12,  16,  20,  24,  28,
 110     36,  44,  52,  64,  76,  92, 108, 128
 111 };
 112
 113 static const uint16_t swb_offset_1024_16[] = {
 114       0,   8,  16,  24,  32,  40,  48,  56,
 115      64,  72,  80,  88, 100, 112, 124, 136,
 116     148, 160, 172, 184, 196, 212, 228, 244,
 117     260, 280, 300, 320, 344, 368, 396, 424,
 118     456, 492, 532, 572, 616, 664, 716, 772,
 119     832, 896, 960, 1024
 120 };
 121
 122 static const uint16_t swb_offset_128_16[] = {
 123      0,   4,   8,  12,  16,  20,  24,  28,
 124     32,  40,  48,  60,  72,  88, 108, 128
 125 };
 126
 127 static const uint16_t swb_offset_1024_8[] = {
 128       0,  12,  24,  36,  48,  60,  72,  84,
 129      96, 108, 120, 132, 144, 156, 172, 188,
 130     204, 220, 236, 252, 268, 288, 308, 328,
 131     348, 372, 396, 420, 448, 476, 508, 544,
 132     580, 620, 664, 712, 764, 820, 880, 944,
 133     1024
 134 };
 135
 136 static const uint16_t swb_offset_128_8[] = {
 137      0,   4,   8,  12,  16,  20,  24,  28,
 138     36,  44,  52,  60,  72,  88, 108, 128
 139 };
 140
 141 static const uint16_t *swb_offset_1024[] = {
 142     swb_offset_1024_96, swb_offset_1024_96, swb_offset_1024_64,
 143     swb_offset_1024_48, swb_offset_1024_48, swb_offset_1024_32,
 144     swb_offset_1024_24, swb_offset_1024_24, swb_offset_1024_16,
 145     swb_offset_1024_16, swb_offset_1024_16, swb_offset_1024_8,
 146     swb_offset_1024_8
 147 };
 148
 149 static const uint16_t *swb_offset_128[] = {
 150     /* The last entry on the following row is swb_offset_128_64 but is a
 151        duplicate of swb_offset_128_96. */
 152     swb_offset_128_96, swb_offset_128_96, swb_offset_128_96,
 153     swb_offset_128_48, swb_offset_128_48, swb_offset_128_48,
 154     swb_offset_128_24, swb_offset_128_24, swb_offset_128_16,
 155     swb_offset_128_16, swb_offset_128_16, swb_offset_128_8,
 156     swb_offset_128_8
 157 };
 158
 159 // @}
 160
 161 /* @name tns_max_bands
 162  * The maximum number of scalefactor bands on which TNS can operate for the long
 163  * and short transforms respectively. The index to these tables is related to
 164  * the sample rate of the audio.
 165  * @{
 166  */
 167 static const uint8_t tns_max_bands_1024[] = {
 168     31, 31, 34, 40, 42, 51, 46, 46, 42, 42, 42, 39, 39
 169 };
 170
 171 static const uint8_t tns_max_bands_128[] = {
 172     9, 9, 10, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14
 173 };
 174 // @}
 175
 176 /* @name tns_tmp2_map
 177  * Tables of the tmp2[] arrays of LPC coefficients used for TNS.
 178  * The suffix _M_N[] indicate the values of coef_compress and coef_res
 179  * respectively.
 180  * @{
 181  */
 182 static const float tns_tmp2_map_1_3[4] = {
 183      0.00000000, -0.43388373,  0.64278758,  0.34202015,
 184 };
 185
 186 static const float tns_tmp2_map_0_3[8] = {
 187      0.00000000, -0.43388373, -0.78183150, -0.97492790,
 188      0.98480773,  0.86602539,  0.64278758,  0.34202015,
 189 };
 190
 191 static const float tns_tmp2_map_1_4[8] = {
 192      0.00000000, -0.20791170, -0.40673664, -0.58778524,
 193      0.67369562,  0.52643216,  0.36124167,  0.18374951,
 194 };
 195
 196 static const float tns_tmp2_map_0_4[16] = {
 197      0.00000000, -0.20791170, -0.40673664, -0.58778524,
 198     -0.74314481, -0.86602539, -0.95105654, -0.99452192,
 199      0.99573416,  0.96182561,  0.89516330,  0.79801720,
 200      0.67369562,  0.52643216,  0.36124167,  0.18374951,
 201 };
 202
 203 static const float * const tns_tmp2_map[4] = {
 204     tns_tmp2_map_0_3,
 205     tns_tmp2_map_0_4,
 206     tns_tmp2_map_1_3,
 207     tns_tmp2_map_1_4
 208 };
 209 // @}
 210
 211 #endif /* AVCODEC_AACDECTAB_H */