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210 lines
6.6 KiB
C
210 lines
6.6 KiB
C
/*
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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 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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};
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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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};
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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
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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
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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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