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186 lines
6.3 KiB
186 lines
6.3 KiB
/* |
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* AAC data declarations |
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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 |
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* AAC data declarations |
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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_AACTAB_H |
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#define AVCODEC_AACTAB_H |
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#include "libavutil/mem.h" |
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#include "aac.h" |
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#include <stdint.h> |
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/* NOTE: |
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* Tables in this file are shared by the AAC decoders and encoder |
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*/ |
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extern float ff_aac_pow2sf_tab[428]; |
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extern float ff_aac_pow34sf_tab[428]; |
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static inline void ff_aac_tableinit(void) |
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{ |
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int i; |
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/* 2^(i/16) for 0 <= i <= 15 */ |
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static const float exp2_lut[] = { |
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1.00000000000000000000, |
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1.04427378242741384032, |
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1.09050773266525765921, |
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1.13878863475669165370, |
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1.18920711500272106672, |
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1.24185781207348404859, |
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1.29683955465100966593, |
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1.35425554693689272830, |
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1.41421356237309504880, |
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1.47682614593949931139, |
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1.54221082540794082361, |
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1.61049033194925430818, |
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1.68179283050742908606, |
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1.75625216037329948311, |
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1.83400808640934246349, |
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1.91520656139714729387, |
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}; |
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float t1 = 8.8817841970012523233890533447265625e-16; // 2^(-50) |
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float t2 = 3.63797880709171295166015625e-12; // 2^(-38) |
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int t1_inc_cur, t2_inc_cur; |
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int t1_inc_prev = 0; |
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int t2_inc_prev = 8; |
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for (i = 0; i < 428; i++) { |
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t1_inc_cur = 4 * (i % 4); |
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t2_inc_cur = (8 + 3*i) % 16; |
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if (t1_inc_cur < t1_inc_prev) |
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t1 *= 2; |
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if (t2_inc_cur < t2_inc_prev) |
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t2 *= 2; |
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// A much more efficient and accurate way of doing: |
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// ff_aac_pow2sf_tab[i] = pow(2, (i - POW_SF2_ZERO) / 4.0); |
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// ff_aac_pow34sf_tab[i] = pow(ff_aac_pow2sf_tab[i], 3.0/4.0); |
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ff_aac_pow2sf_tab[i] = t1 * exp2_lut[t1_inc_cur]; |
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ff_aac_pow34sf_tab[i] = t2 * exp2_lut[t2_inc_cur]; |
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t1_inc_prev = t1_inc_cur; |
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t2_inc_prev = t2_inc_cur; |
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} |
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} |
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/* @name ltp_coef |
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* Table of the LTP coefficients |
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*/ |
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static const INTFLOAT ltp_coef[8] = { |
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Q30(0.570829), Q30(0.696616), Q30(0.813004), Q30(0.911304), |
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Q30(0.984900), Q30(1.067894), Q30(1.194601), Q30(1.369533), |
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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 INTFLOAT tns_tmp2_map_1_3[4] = { |
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Q31(0.00000000), Q31(-0.43388373), Q31(0.64278758), Q31(0.34202015), |
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}; |
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static const INTFLOAT tns_tmp2_map_0_3[8] = { |
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Q31(0.00000000), Q31(-0.43388373), Q31(-0.78183150), Q31(-0.97492790), |
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Q31(0.98480773), Q31( 0.86602539), Q31( 0.64278758), Q31( 0.34202015), |
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}; |
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static const INTFLOAT tns_tmp2_map_1_4[8] = { |
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Q31(0.00000000), Q31(-0.20791170), Q31(-0.40673664), Q31(-0.58778524), |
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Q31(0.67369562), Q31( 0.52643216), Q31( 0.36124167), Q31( 0.18374951), |
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}; |
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static const INTFLOAT tns_tmp2_map_0_4[16] = { |
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Q31( 0.00000000), Q31(-0.20791170), Q31(-0.40673664), Q31(-0.58778524), |
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Q31(-0.74314481), Q31(-0.86602539), Q31(-0.95105654), Q31(-0.99452192), |
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Q31( 0.99573416), Q31( 0.96182561), Q31( 0.89516330), Q31( 0.79801720), |
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Q31( 0.67369562), Q31( 0.52643216), Q31( 0.36124167), Q31( 0.18374951), |
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}; |
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static const INTFLOAT * 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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/* @name window coefficients |
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* @{ |
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*/ |
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DECLARE_ALIGNED(32, extern float, ff_aac_kbd_long_1024)[1024]; |
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DECLARE_ALIGNED(32, extern float, ff_aac_kbd_short_128)[128]; |
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DECLARE_ALIGNED(32, extern float, ff_aac_kbd_long_960)[960]; |
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DECLARE_ALIGNED(32, extern float, ff_aac_kbd_short_120)[120]; |
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DECLARE_ALIGNED(32, extern int, ff_aac_kbd_long_1024_fixed)[1024]; |
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DECLARE_ALIGNED(32, extern int, ff_aac_kbd_long_512_fixed)[512]; |
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DECLARE_ALIGNED(32, extern int, ff_aac_kbd_short_128_fixed)[128]; |
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DECLARE_ALIGNED(32, extern const float, ff_aac_eld_window_512)[1920]; |
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DECLARE_ALIGNED(32, extern const int, ff_aac_eld_window_512_fixed)[1920]; |
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DECLARE_ALIGNED(32, extern const float, ff_aac_eld_window_480)[1800]; |
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DECLARE_ALIGNED(32, extern const int, ff_aac_eld_window_480_fixed)[1800]; |
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// @} |
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/* @name number of scalefactor window bands for long and short transform windows respectively |
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* @{ |
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*/ |
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extern const uint8_t ff_aac_num_swb_1024[]; |
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extern const uint8_t ff_aac_num_swb_960 []; |
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extern const uint8_t ff_aac_num_swb_512 []; |
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extern const uint8_t ff_aac_num_swb_480 []; |
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extern const uint8_t ff_aac_num_swb_128 []; |
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extern const uint8_t ff_aac_num_swb_120 []; |
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// @} |
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extern const uint8_t ff_aac_pred_sfb_max []; |
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extern const uint32_t ff_aac_scalefactor_code[121]; |
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extern const uint8_t ff_aac_scalefactor_bits[121]; |
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extern const uint16_t * const ff_aac_spectral_codes[11]; |
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extern const uint8_t * const ff_aac_spectral_bits [11]; |
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extern const uint16_t ff_aac_spectral_sizes[11]; |
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extern const float *ff_aac_codebook_vectors[]; |
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extern const float *ff_aac_codebook_vector_vals[]; |
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extern const uint16_t *ff_aac_codebook_vector_idx[]; |
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extern const uint16_t * const ff_swb_offset_1024[13]; |
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extern const uint16_t * const ff_swb_offset_960 [13]; |
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extern const uint16_t * const ff_swb_offset_512 [13]; |
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extern const uint16_t * const ff_swb_offset_480 [13]; |
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extern const uint16_t * const ff_swb_offset_128 [13]; |
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extern const uint16_t * const ff_swb_offset_120 [13]; |
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extern const uint8_t ff_tns_max_bands_1024[13]; |
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extern const uint8_t ff_tns_max_bands_512 [13]; |
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extern const uint8_t ff_tns_max_bands_480 [13]; |
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extern const uint8_t ff_tns_max_bands_128 [13]; |
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#endif /* AVCODEC_AACTAB_H */
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