diff options
Diffstat (limited to 'libavcodec/aactab.h')
-rw-r--r-- | libavcodec/aactab.h | 115 |
1 files changed, 108 insertions, 7 deletions
diff --git a/libavcodec/aactab.h b/libavcodec/aactab.h index b1e9510..7cd8128 100644 --- a/libavcodec/aactab.h +++ b/libavcodec/aactab.h @@ -3,20 +3,20 @@ * Copyright (c) 2005-2006 Oded Shimon ( ods15 ods15 dyndns org ) * Copyright (c) 2006-2007 Maxim Gavrilov ( maxim.gavrilov gmail com ) * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * - * Libav is distributed in the hope that it will be useful, + * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public - * License along with Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ @@ -32,31 +32,130 @@ #include "libavutil/mem.h" #include "aac.h" -#include "aac_tablegen_decl.h" #include <stdint.h> /* NOTE: - * Tables in this file are used by the AAC decoder and will be used by the AAC - * encoder. + * Tables in this file are shared by the AAC decoders and encoder */ +extern float ff_aac_pow2sf_tab[428]; +extern float ff_aac_pow34sf_tab[428]; + +static inline void ff_aac_tableinit(void) +{ + int i; + + /* 2^(i/16) for 0 <= i <= 15 */ + static const float exp2_lut[] = { + 1.00000000000000000000, + 1.04427378242741384032, + 1.09050773266525765921, + 1.13878863475669165370, + 1.18920711500272106672, + 1.24185781207348404859, + 1.29683955465100966593, + 1.35425554693689272830, + 1.41421356237309504880, + 1.47682614593949931139, + 1.54221082540794082361, + 1.61049033194925430818, + 1.68179283050742908606, + 1.75625216037329948311, + 1.83400808640934246349, + 1.91520656139714729387, + }; + float t1 = 8.8817841970012523233890533447265625e-16; // 2^(-50) + float t2 = 3.63797880709171295166015625e-12; // 2^(-38) + int t1_inc_cur, t2_inc_cur; + int t1_inc_prev = 0; + int t2_inc_prev = 8; + + for (i = 0; i < 428; i++) { + t1_inc_cur = 4 * (i % 4); + t2_inc_cur = (8 + 3*i) % 16; + if (t1_inc_cur < t1_inc_prev) + t1 *= 2; + if (t2_inc_cur < t2_inc_prev) + t2 *= 2; + // A much more efficient and accurate way of doing: + // ff_aac_pow2sf_tab[i] = pow(2, (i - POW_SF2_ZERO) / 4.0); + // ff_aac_pow34sf_tab[i] = pow(ff_aac_pow2sf_tab[i], 3.0/4.0); + ff_aac_pow2sf_tab[i] = t1 * exp2_lut[t1_inc_cur]; + ff_aac_pow34sf_tab[i] = t2 * exp2_lut[t2_inc_cur]; + t1_inc_prev = t1_inc_cur; + t2_inc_prev = t2_inc_cur; + } +} + +/* @name ltp_coef + * Table of the LTP coefficients + */ +static const INTFLOAT ltp_coef[8] = { + Q30(0.570829), Q30(0.696616), Q30(0.813004), Q30(0.911304), + Q30(0.984900), Q30(1.067894), Q30(1.194601), Q30(1.369533), +}; + +/* @name tns_tmp2_map + * Tables of the tmp2[] arrays of LPC coefficients used for TNS. + * The suffix _M_N[] indicate the values of coef_compress and coef_res + * respectively. + * @{ + */ +static const INTFLOAT tns_tmp2_map_1_3[4] = { + Q31(0.00000000), Q31(-0.43388373), Q31(0.64278758), Q31(0.34202015), +}; + +static const INTFLOAT tns_tmp2_map_0_3[8] = { + Q31(0.00000000), Q31(-0.43388373), Q31(-0.78183150), Q31(-0.97492790), + Q31(0.98480773), Q31( 0.86602539), Q31( 0.64278758), Q31( 0.34202015), +}; + +static const INTFLOAT tns_tmp2_map_1_4[8] = { + Q31(0.00000000), Q31(-0.20791170), Q31(-0.40673664), Q31(-0.58778524), + Q31(0.67369562), Q31( 0.52643216), Q31( 0.36124167), Q31( 0.18374951), +}; + +static const INTFLOAT tns_tmp2_map_0_4[16] = { + Q31( 0.00000000), Q31(-0.20791170), Q31(-0.40673664), Q31(-0.58778524), + Q31(-0.74314481), Q31(-0.86602539), Q31(-0.95105654), Q31(-0.99452192), + Q31( 0.99573416), Q31( 0.96182561), Q31( 0.89516330), Q31( 0.79801720), + Q31( 0.67369562), Q31( 0.52643216), Q31( 0.36124167), Q31( 0.18374951), +}; + +static const INTFLOAT * const tns_tmp2_map[4] = { + tns_tmp2_map_0_3, + tns_tmp2_map_0_4, + tns_tmp2_map_1_3, + tns_tmp2_map_1_4 +}; +// @} + /* @name window coefficients * @{ */ DECLARE_ALIGNED(32, extern float, ff_aac_kbd_long_1024)[1024]; DECLARE_ALIGNED(32, extern float, ff_aac_kbd_short_128)[128]; +DECLARE_ALIGNED(32, extern float, ff_aac_kbd_long_960)[960]; +DECLARE_ALIGNED(32, extern float, ff_aac_kbd_short_120)[120]; +DECLARE_ALIGNED(32, extern int, ff_aac_kbd_long_1024_fixed)[1024]; +DECLARE_ALIGNED(32, extern int, ff_aac_kbd_long_512_fixed)[512]; +DECLARE_ALIGNED(32, extern int, ff_aac_kbd_short_128_fixed)[128]; DECLARE_ALIGNED(32, extern const float, ff_aac_eld_window_512)[1920]; +DECLARE_ALIGNED(32, extern const int, ff_aac_eld_window_512_fixed)[1920]; DECLARE_ALIGNED(32, extern const float, ff_aac_eld_window_480)[1800]; +DECLARE_ALIGNED(32, extern const int, ff_aac_eld_window_480_fixed)[1800]; // @} /* @name number of scalefactor window bands for long and short transform windows respectively * @{ */ extern const uint8_t ff_aac_num_swb_1024[]; +extern const uint8_t ff_aac_num_swb_960 []; extern const uint8_t ff_aac_num_swb_512 []; extern const uint8_t ff_aac_num_swb_480 []; extern const uint8_t ff_aac_num_swb_128 []; +extern const uint8_t ff_aac_num_swb_120 []; // @} extern const uint8_t ff_aac_pred_sfb_max []; @@ -73,9 +172,11 @@ extern const float *ff_aac_codebook_vector_vals[]; extern const uint16_t *ff_aac_codebook_vector_idx[]; extern const uint16_t * const ff_swb_offset_1024[13]; +extern const uint16_t * const ff_swb_offset_960 [13]; extern const uint16_t * const ff_swb_offset_512 [13]; extern const uint16_t * const ff_swb_offset_480 [13]; extern const uint16_t * const ff_swb_offset_128 [13]; +extern const uint16_t * const ff_swb_offset_120 [13]; extern const uint8_t ff_tns_max_bands_1024[13]; extern const uint8_t ff_tns_max_bands_512 [13]; |