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211 lines
6.6 KiB
211 lines
6.6 KiB
/* |
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* AAC decoder data |
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* Copyright (c) 2005-2006 Oded Shimon ( ods15 ods15 dyndns org ) |
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* Copyright (c) 2006-2007 Maxim Gavrilov ( maxim.gavrilov gmail com ) |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file libavcodec/aacdectab.h |
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* AAC decoder data |
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* @author Oded Shimon ( ods15 ods15 dyndns org ) |
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* @author Maxim Gavrilov ( maxim.gavrilov gmail com ) |
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*/ |
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#ifndef AVCODEC_AACDECTAB_H |
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#define AVCODEC_AACDECTAB_H |
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#include "aac.h" |
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#include <stdint.h> |
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/* @name swb_offsets |
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* Sample offset into the window indicating the beginning of a scalefactor |
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* window band |
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* |
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* scalefactor window band - term for scalefactor bands within a window, |
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* given in Table 4.110 to Table 4.128. |
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* |
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* scalefactor band - a set of spectral coefficients which are scaled by one |
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* scalefactor. In case of EIGHT_SHORT_SEQUENCE and grouping a scalefactor band |
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* may contain several scalefactor window bands of corresponding frequency. For |
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* all other window_sequences scalefactor bands and scalefactor window bands are |
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* identical. |
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* @{ |
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*/ |
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static const uint16_t swb_offset_1024_96[] = { |
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0, 4, 8, 12, 16, 20, 24, 28, |
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32, 36, 40, 44, 48, 52, 56, 64, |
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72, 80, 88, 96, 108, 120, 132, 144, |
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156, 172, 188, 212, 240, 276, 320, 384, |
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448, 512, 576, 640, 704, 768, 832, 896, |
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960, 1024 |
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}; |
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static const uint16_t swb_offset_128_96[] = { |
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0, 4, 8, 12, 16, 20, 24, 32, 40, 48, 64, 92, 128 |
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}; |
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static const uint16_t swb_offset_1024_64[] = { |
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0, 4, 8, 12, 16, 20, 24, 28, |
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32, 36, 40, 44, 48, 52, 56, 64, |
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72, 80, 88, 100, 112, 124, 140, 156, |
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172, 192, 216, 240, 268, 304, 344, 384, |
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424, 464, 504, 544, 584, 624, 664, 704, |
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744, 784, 824, 864, 904, 944, 984, 1024 |
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}; |
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static const uint16_t swb_offset_1024_48[] = { |
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0, 4, 8, 12, 16, 20, 24, 28, |
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32, 36, 40, 48, 56, 64, 72, 80, |
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88, 96, 108, 120, 132, 144, 160, 176, |
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196, 216, 240, 264, 292, 320, 352, 384, |
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416, 448, 480, 512, 544, 576, 608, 640, |
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672, 704, 736, 768, 800, 832, 864, 896, |
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928, 1024 |
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}; |
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static const uint16_t swb_offset_128_48[] = { |
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0, 4, 8, 12, 16, 20, 28, 36, |
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44, 56, 68, 80, 96, 112, 128 |
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}; |
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static const uint16_t swb_offset_1024_32[] = { |
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0, 4, 8, 12, 16, 20, 24, 28, |
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32, 36, 40, 48, 56, 64, 72, 80, |
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88, 96, 108, 120, 132, 144, 160, 176, |
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196, 216, 240, 264, 292, 320, 352, 384, |
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416, 448, 480, 512, 544, 576, 608, 640, |
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672, 704, 736, 768, 800, 832, 864, 896, |
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928, 960, 992, 1024 |
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}; |
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static const uint16_t swb_offset_1024_24[] = { |
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0, 4, 8, 12, 16, 20, 24, 28, |
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32, 36, 40, 44, 52, 60, 68, 76, |
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84, 92, 100, 108, 116, 124, 136, 148, |
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160, 172, 188, 204, 220, 240, 260, 284, |
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308, 336, 364, 396, 432, 468, 508, 552, |
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600, 652, 704, 768, 832, 896, 960, 1024 |
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}; |
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static const uint16_t swb_offset_128_24[] = { |
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0, 4, 8, 12, 16, 20, 24, 28, |
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36, 44, 52, 64, 76, 92, 108, 128 |
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}; |
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static const uint16_t swb_offset_1024_16[] = { |
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0, 8, 16, 24, 32, 40, 48, 56, |
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64, 72, 80, 88, 100, 112, 124, 136, |
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148, 160, 172, 184, 196, 212, 228, 244, |
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260, 280, 300, 320, 344, 368, 396, 424, |
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456, 492, 532, 572, 616, 664, 716, 772, |
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832, 896, 960, 1024 |
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}; |
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static const uint16_t swb_offset_128_16[] = { |
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0, 4, 8, 12, 16, 20, 24, 28, |
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32, 40, 48, 60, 72, 88, 108, 128 |
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}; |
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static const uint16_t swb_offset_1024_8[] = { |
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0, 12, 24, 36, 48, 60, 72, 84, |
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96, 108, 120, 132, 144, 156, 172, 188, |
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204, 220, 236, 252, 268, 288, 308, 328, |
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348, 372, 396, 420, 448, 476, 508, 544, |
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580, 620, 664, 712, 764, 820, 880, 944, |
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1024 |
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}; |
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static const uint16_t swb_offset_128_8[] = { |
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0, 4, 8, 12, 16, 20, 24, 28, |
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36, 44, 52, 60, 72, 88, 108, 128 |
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}; |
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static const uint16_t *swb_offset_1024[] = { |
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swb_offset_1024_96, swb_offset_1024_96, swb_offset_1024_64, |
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swb_offset_1024_48, swb_offset_1024_48, swb_offset_1024_32, |
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swb_offset_1024_24, swb_offset_1024_24, swb_offset_1024_16, |
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swb_offset_1024_16, swb_offset_1024_16, swb_offset_1024_8, |
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swb_offset_1024_8 |
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}; |
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static const uint16_t *swb_offset_128[] = { |
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/* The last entry on the following row is swb_offset_128_64 but is a |
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duplicate of swb_offset_128_96. */ |
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swb_offset_128_96, swb_offset_128_96, swb_offset_128_96, |
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swb_offset_128_48, swb_offset_128_48, swb_offset_128_48, |
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swb_offset_128_24, swb_offset_128_24, swb_offset_128_16, |
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swb_offset_128_16, swb_offset_128_16, swb_offset_128_8, |
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swb_offset_128_8 |
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}; |
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// @} |
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/* @name tns_max_bands |
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* The maximum number of scalefactor bands on which TNS can operate for the long |
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* and short transforms respectively. The index to these tables is related to |
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* the sample rate of the audio. |
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* @{ |
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*/ |
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static const uint8_t tns_max_bands_1024[] = { |
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31, 31, 34, 40, 42, 51, 46, 46, 42, 42, 42, 39, 39 |
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}; |
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static const uint8_t tns_max_bands_128[] = { |
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9, 9, 10, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14 |
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}; |
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// @} |
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/* @name tns_tmp2_map |
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* Tables of the tmp2[] arrays of LPC coefficients used for TNS. |
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* The suffix _M_N[] indicate the values of coef_compress and coef_res |
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* respectively. |
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* @{ |
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*/ |
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static const float tns_tmp2_map_1_3[4] = { |
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0.00000000, -0.43388373, 0.64278758, 0.34202015, |
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}; |
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static const float tns_tmp2_map_0_3[8] = { |
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0.00000000, -0.43388373, -0.78183150, -0.97492790, |
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0.98480773, 0.86602539, 0.64278758, 0.34202015, |
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}; |
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static const float tns_tmp2_map_1_4[8] = { |
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0.00000000, -0.20791170, -0.40673664, -0.58778524, |
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0.67369562, 0.52643216, 0.36124167, 0.18374951, |
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}; |
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static const float tns_tmp2_map_0_4[16] = { |
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0.00000000, -0.20791170, -0.40673664, -0.58778524, |
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-0.74314481, -0.86602539, -0.95105654, -0.99452192, |
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0.99573416, 0.96182561, 0.89516330, 0.79801720, |
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0.67369562, 0.52643216, 0.36124167, 0.18374951, |
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}; |
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static const float * const tns_tmp2_map[4] = { |
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tns_tmp2_map_0_3, |
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tns_tmp2_map_0_4, |
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tns_tmp2_map_1_3, |
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tns_tmp2_map_1_4 |
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}; |
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// @} |
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#endif /* AVCODEC_AACDECTAB_H */
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