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  1. /*
  2.  * AAC encoder data
  3.  * Copyright (c) 2015 Rostislav Pehlivanov ( atomnuker gmail com )
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /**
  23.  * @file
  24.  * AAC encoder data
  25.  * @author Rostislav Pehlivanov ( atomnuker gmail com )
  26.  */
  27.  
  28. #ifndef AVCODEC_AACENCTAB_H
  29. #define AVCODEC_AACENCTAB_H
  30.  
  31. #include "aac.h"
  32.  
  33. /** Total number of usable codebooks **/
  34. #define CB_TOT 12
  35.  
  36. /** Total number of codebooks, including special ones **/
  37. #define CB_TOT_ALL 15
  38.  
  39. #define AAC_MAX_CHANNELS 6
  40.  
  41. extern const uint8_t *ff_aac_swb_size_1024[];
  42. extern const int      ff_aac_swb_size_1024_len;
  43. extern const uint8_t *ff_aac_swb_size_128[];
  44. extern const int      ff_aac_swb_size_128_len;
  45.  
  46. /** default channel configurations */
  47. static const uint8_t aac_chan_configs[6][5] = {
  48.     {1, TYPE_SCE},                               // 1 channel  - single channel element
  49.     {1, TYPE_CPE},                               // 2 channels - channel pair
  50.     {2, TYPE_SCE, TYPE_CPE},                     // 3 channels - center + stereo
  51.     {3, TYPE_SCE, TYPE_CPE, TYPE_SCE},           // 4 channels - front center + stereo + back center
  52.     {3, TYPE_SCE, TYPE_CPE, TYPE_CPE},           // 5 channels - front center + stereo + back stereo
  53.     {4, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_LFE}, // 6 channels - front center + stereo + back stereo + LFE
  54. };
  55.  
  56. /**
  57.  * Table to remap channels from libavcodec's default order to AAC order.
  58.  */
  59. static const uint8_t aac_chan_maps[AAC_MAX_CHANNELS][AAC_MAX_CHANNELS] = {
  60.     { 0 },
  61.     { 0, 1 },
  62.     { 2, 0, 1 },
  63.     { 2, 0, 1, 3 },
  64.     { 2, 0, 1, 3, 4 },
  65.     { 2, 0, 1, 4, 5, 3 },
  66. };
  67.  
  68. /* duplicated from avpriv_mpeg4audio_sample_rates to avoid shared build
  69.  * failures */
  70. static const int mpeg4audio_sample_rates[16] = {
  71.     96000, 88200, 64000, 48000, 44100, 32000,
  72.     24000, 22050, 16000, 12000, 11025, 8000, 7350
  73. };
  74.  
  75. /** bits needed to code codebook run value for long windows */
  76. static const uint8_t run_value_bits_long[64] = {
  77.      5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,
  78.      5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5, 10,
  79.     10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
  80.     10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 15
  81. };
  82.  
  83. /** bits needed to code codebook run value for short windows */
  84. static const uint8_t run_value_bits_short[16] = {
  85.     3, 3, 3, 3, 3, 3, 3, 6, 6, 6, 6, 6, 6, 6, 6, 9
  86. };
  87.  
  88. /* TNS starting SFBs for long and short windows */
  89. static const uint8_t tns_min_sfb_short[16] = {
  90.     2, 2, 2, 3, 3, 4, 6, 6, 8, 10, 10, 12, 12, 12, 12, 12
  91. };
  92.  
  93. static const uint8_t tns_min_sfb_long[16] = {
  94.     12, 13, 15, 16, 17, 20, 25, 26, 24, 28, 30, 31, 31, 31, 31, 31
  95. };
  96.  
  97. static const uint8_t * const tns_min_sfb[2] = {
  98.     tns_min_sfb_long, tns_min_sfb_short
  99. };
  100.  
  101. static const uint8_t * const run_value_bits[2] = {
  102.     run_value_bits_long, run_value_bits_short
  103. };
  104.  
  105. /** Map to convert values from BandCodingPath index to a codebook index **/
  106. static const uint8_t aac_cb_out_map[CB_TOT_ALL]  = {0,1,2,3,4,5,6,7,8,9,10,11,13,14,15};
  107. /** Inverse map to convert from codebooks to BandCodingPath indices **/
  108. static const uint8_t aac_cb_in_map[CB_TOT_ALL+1] = {0,1,2,3,4,5,6,7,8,9,10,11,0,12,13,14};
  109.  
  110. static const uint8_t aac_cb_range [12] = {0, 3, 3, 3, 3, 9, 9, 8, 8, 13, 13, 17};
  111. static const uint8_t aac_cb_maxval[12] = {0, 1, 1, 2, 2, 4, 4, 7, 7, 12, 12, 16};
  112.  
  113. #endif /* AVCODEC_AACENCTAB_H */
  114.