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FFmpeg/libavcodec/atrac3plusdsp.c

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  1. /*

  2.  * ATRAC3+ compatible decoder

  3.  *

  4.  * Copyright (c) 2010-2013 Maxim Poliakovski

  5.  *

  6.  * This file is part of Libav.

  7.  *

  8.  * Libav is free software; you can redistribute it and/or

  9.  * modify it under the terms of the GNU Lesser General Public

  10.  * License as published by the Free Software Foundation; either

  11.  * version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * Libav is distributed in the hope that it will be useful,

  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  16.  * Lesser General Public License for more details.

  17.  *

  18.  * You should have received a copy of the GNU Lesser General Public

  19.  * License along with Libav; if not, write to the Free Software

  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  21.  */

  22. 

  23. /**

  24.  *  @file

  25.  *  DSP functions for ATRAC3+ decoder.

  26.  */

  27. 

  28. #include <math.h>

  29. 

  30. #include "libavutil/float_dsp.h"

  31. #include "avcodec.h"

  32. #include "sinewin.h"

  33. #include "fft.h"

  34. #include "atrac3plus.h"

  35. 

  36. /**

  37.  *  Map quant unit number to its position in the spectrum.

  38.  *  To get the number of spectral lines in each quant unit do the following:

  39.  *  num_specs = qu_to_spec_pos[i+1] - qu_to_spec_pos[i]

  40.  */

  41. const uint16_t ff_atrac3p_qu_to_spec_pos[33] = {

  42.       0,    16,   32,   48,   64,   80,   96,  112,

  43.     128,   160,  192,  224,  256,  288,  320,  352,

  44.     384,   448,  512,  576,  640,  704,  768,  896,

  45.     1024, 1152, 1280, 1408, 1536, 1664, 1792, 1920,

  46.     2048

  47. };

  48. 

  49. /* Scalefactors table. */

  50. /* Approx. Equ: pow(2.0, (i - 16.0 + 0.501783948) / 3.0) */

  51. const float ff_atrac3p_sf_tab[64] = {

  52.     0.027852058,  0.0350914, 0.044212341, 0.055704117,  0.0701828,

  53.     0.088424683, 0.11140823,   0.1403656,  0.17684937, 0.22281647, 0.2807312, 0.35369873,

  54.     0.44563293,   0.5614624,  0.70739746,  0.89126587,  1.1229248, 1.4147949,  1.7825317,

  55.     2.2458496,    2.8295898,   3.5650635,   4.4916992,  5.6591797,  7.130127,  8.9833984,

  56.     11.318359,    14.260254,   17.966797,   22.636719,  28.520508, 35.933594,  45.273438,

  57.     57.041016,    71.867188,   90.546875,   114.08203,  143.73438, 181.09375,  228.16406,

  58.     287.46875,     362.1875,   456.32812,    574.9375,    724.375, 912.65625,   1149.875,

  59.     1448.75,      1825.3125,     2299.75,      2897.5,   3650.625,    4599.5,     5795.0,

  60.     7301.25,         9199.0,     11590.0,     14602.5,    18398.0,   23180.0,    29205.0,

  61.     36796.0,        46360.0,     58410.0

  62. };

  63. 

  64. /* Mantissa table. */

  65. /* pow(10, x * log10(2) + 0.05) / 2 / ([1,2,3,5,7,15,31] + 0.5) */

  66. const float ff_atrac3p_mant_tab[8] = {

  67.     0.0,

  68.     0.74801636,

  69.     0.44882202,

  70.     0.32058716,

  71.     0.20400238,

  72.     0.1496048,

  73.     0.07239151,

  74.     0.035619736

  75. };

  76. 

  77. #define ATRAC3P_MDCT_SIZE (ATRAC3P_SUBBAND_SAMPLES * 2)

  78. 

  79. av_cold void ff_atrac3p_init_imdct(AVCodecContext *avctx, FFTContext *mdct_ctx)

  80. {

  81.     ff_init_ff_sine_windows(7);

  82.     ff_init_ff_sine_windows(6);

  83. 

  84.     /* Initialize the MDCT transform. */

  85.     ff_mdct_init(mdct_ctx, 8, 1, -1.0);

  86. }

  87. 

  88. #define TWOPI (2 * M_PI)

  89. 

  90. #define DEQUANT_PHASE(ph) (((ph) & 0x1F) << 6)

  91. 

  92. static DECLARE_ALIGNED(32, float, sine_table)[2048]; ///< wave table

  93. static DECLARE_ALIGNED(32, float, hann_window)[256]; ///< Hann windowing function

  94. static float amp_sf_tab[64];   ///< scalefactors for quantized amplitudes

  95. 

  96. av_cold void ff_atrac3p_init_wave_synth(void)

  97. {

  98.     int i;

  99. 

  100.     /* generate sine wave table */

  101.     for (i = 0; i < 2048; i++)

  102.         sine_table[i] = sin(TWOPI * i / 2048);

  103. 

  104.     /* generate Hann window */

  105.     for (i = 0; i < 256; i++)

  106.         hann_window[i] = (1.0f - cos(TWOPI * i / 256.0f)) * 0.5f;

  107. 

  108.     /* generate amplitude scalefactors table */

  109.     for (i = 0; i < 64; i++)

  110.         amp_sf_tab[i] = pow(2.0f, ((double)i - 3) / 4.0f);

  111. }

  112. 

  113. /**

  114.  *  Synthesize sine waves according to given parameters.

  115.  *

  116.  *  @param[in]    synth_param   ptr to common synthesis parameters

  117.  *  @param[in]    waves_info    parameters for each sine wave

  118.  *  @param[in]    envelope      envelope data for all waves in a group

  119.  *  @param[in]    phase_shift   flag indicates 180° phase shift

  120.  *  @param[in]    reg_offset    region offset for trimming envelope data

  121.  *  @param[out]   out           receives sythesized data

  122.  */

  123. static void waves_synth(Atrac3pWaveSynthParams *synth_param,

  124.                         Atrac3pWavesData *waves_info,

  125.                         Atrac3pWaveEnvelope *envelope,

  126.                         int phase_shift, int reg_offset, float *out)

  127. {

  128.     int i, wn, inc, pos;

  129.     double amp;

  130.     Atrac3pWaveParam *wave_param = &synth_param->waves[waves_info->start_index];

  131. 

  132.     for (wn = 0; wn < waves_info->num_wavs; wn++, wave_param++) {

  133.         /* amplitude dequantization */

  134.         amp = amp_sf_tab[wave_param->amp_sf] *

  135.               (!synth_param->amplitude_mode

  136.                ? (wave_param->amp_index + 1) / 15.13f

  137.                : 1.0f);

  138. 

  139.         inc = wave_param->freq_index;

  140.         pos = DEQUANT_PHASE(wave_param->phase_index) - (reg_offset ^ 128) * inc & 2047;

  141. 

  142.         /* waveform generation */

  143.         for (i = 0; i < 128; i++) {

  144.             out[i] += sine_table[pos] * amp;

  145.             pos     = (pos + inc) & 2047;

  146.         }

  147.     }

  148. 

  149.     /* fade in with steep Hann window if requested */

  150.     if (envelope->has_start_point) {

  151.         pos = (envelope->start_pos << 2) - reg_offset;

  152.         if (pos > 0 && pos <= 128) {

  153.             memset(out, 0, pos * sizeof(*out));

  154.             if (!envelope->has_stop_point ||

  155.                 envelope->start_pos != envelope->stop_pos) {

  156.                 out[pos + 0] *= hann_window[0];

  157.                 out[pos + 1] *= hann_window[32];

  158.                 out[pos + 2] *= hann_window[64];

  159.                 out[pos + 3] *= hann_window[96];

  160.             }

  161.         }

  162.     }

  163. 

  164.     /* fade out with steep Hann window if requested */

  165.     if (envelope->has_stop_point) {

  166.         pos = (envelope->stop_pos + 1 << 2) - reg_offset;

  167.         if (pos > 0 && pos <= 128) {

  168.             out[pos - 4] *= hann_window[96];

  169.             out[pos - 3] *= hann_window[64];

  170.             out[pos - 2] *= hann_window[32];

  171.             out[pos - 1] *= hann_window[0];

  172.             memset(&out[pos], 0, (128 - pos) * sizeof(out[pos]));

  173.         }

  174.     }

  175. }

  176. 

  177. void ff_atrac3p_generate_tones(Atrac3pChanUnitCtx *ch_unit, AVFloatDSPContext *fdsp,

  178.                                int ch_num, int sb, float *out)

  179. {

  180.     DECLARE_ALIGNED(32, float, wavreg1)[128] = { 0 };

  181.     DECLARE_ALIGNED(32, float, wavreg2)[128] = { 0 };

  182.     int i, reg1_env_nonzero, reg2_env_nonzero;

  183.     Atrac3pWavesData *tones_now  = &ch_unit->channels[ch_num].tones_info_prev[sb];

  184.     Atrac3pWavesData *tones_next = &ch_unit->channels[ch_num].tones_info[sb];

  185. 

  186.     /* reconstruct full envelopes for both overlapping regions

  187.      * from truncated bitstream data */

  188.     if (tones_next->pend_env.has_start_point &&

  189.         tones_next->pend_env.start_pos < tones_next->pend_env.stop_pos) {

  190.         tones_next->curr_env.has_start_point = 1;

  191.         tones_next->curr_env.start_pos       = tones_next->pend_env.start_pos + 32;

  192.     } else if (tones_now->pend_env.has_start_point) {

  193.         tones_next->curr_env.has_start_point = 1;

  194.         tones_next->curr_env.start_pos       = tones_now->pend_env.start_pos;

  195.     } else {

  196.         tones_next->curr_env.has_start_point = 0;

  197.         tones_next->curr_env.start_pos       = 0;

  198.     }

  199. 

  200.     if (tones_now->pend_env.has_stop_point &&

  201.         tones_now->pend_env.stop_pos >= tones_next->curr_env.start_pos) {

  202.         tones_next->curr_env.has_stop_point = 1;

  203.         tones_next->curr_env.stop_pos       = tones_now->pend_env.stop_pos;

  204.     } else if (tones_next->pend_env.has_stop_point) {

  205.         tones_next->curr_env.has_stop_point = 1;

  206.         tones_next->curr_env.stop_pos       = tones_next->pend_env.stop_pos + 32;

  207.     } else {

  208.         tones_next->curr_env.has_stop_point = 0;

  209.         tones_next->curr_env.stop_pos       = 64;

  210.     }

  211. 

  212.     /* is the visible part of the envelope non-zero? */

  213.     reg1_env_nonzero = (tones_now->curr_env.stop_pos    < 32) ? 0 : 1;

  214.     reg2_env_nonzero = (tones_next->curr_env.start_pos >= 32) ? 0 : 1;

  215. 

  216.     /* synthesize waves for both overlapping regions */

  217.     if (tones_now->num_wavs && reg1_env_nonzero)

  218.         waves_synth(ch_unit->waves_info_prev, tones_now, &tones_now->curr_env,

  219.                     ch_unit->waves_info_prev->phase_shift[sb] & ch_num,

  220.                     128, wavreg1);

  221. 

  222.     if (tones_next->num_wavs && reg2_env_nonzero)

  223.         waves_synth(ch_unit->waves_info, tones_next, &tones_next->curr_env,

  224.                     ch_unit->waves_info->phase_shift[sb] & ch_num, 0, wavreg2);

  225. 

  226.     /* Hann windowing for non-faded wave signals */

  227.     if (tones_now->num_wavs && tones_next->num_wavs &&

  228.         reg1_env_nonzero && reg2_env_nonzero) {

  229.         fdsp->vector_fmul(wavreg1, wavreg1, &hann_window[128], 128);

  230.         fdsp->vector_fmul(wavreg2, wavreg2,  hann_window,      128);

  231.     } else {

  232.         if (tones_now->num_wavs && !tones_now->curr_env.has_stop_point)

  233.             fdsp->vector_fmul(wavreg1, wavreg1, &hann_window[128], 128);

  234. 

  235.         if (tones_next->num_wavs && !tones_next->curr_env.has_start_point)

  236.             fdsp->vector_fmul(wavreg2, wavreg2, hann_window, 128);

  237.     }

  238. 

  239.     /* Overlap and add to residual */

  240.     for (i = 0; i < 128; i++)

  241.         out[i] += wavreg1[i] + wavreg2[i];

  242. }

  243. 

  244. static const int subband_to_powgrp[ATRAC3P_SUBBANDS] = {

  245.     0, 1, 1, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4

  246. };

  247. 

  248. /* noise table for power compensation */

  249. static const float noise_tab[1024] = {

  250.     -0.01358032,  -0.05593872,   0.01696777,  -0.14871216,  -0.26412964,  -0.09893799,   0.25723267,

  251.      0.02008057,  -0.72235107,  -0.44351196,  -0.22985840,   0.16833496,   0.46902466,   0.05917358,

  252.     -0.15179443,   0.41299438,  -0.01287842,   0.13360596,   0.43557739,  -0.09530640,  -0.58422852,

  253.      0.39266968,  -0.08343506,  -0.25604248,   0.22848511,   0.26013184,  -0.65588379,   0.17288208,

  254.     -0.08673096,  -0.05203247,   0.07299805,  -0.28665161,  -0.35806274,   0.06552124,  -0.09387207,

  255.      0.21099854,  -0.28347778,  -0.72402954,   0.05050659,  -0.10635376,  -0.18853760,   0.29724121,

  256.      0.20703125,  -0.29791260,  -0.37634277,   0.47970581,  -0.09976196,   0.32641602,  -0.29248047,

  257.     -0.28237915,   0.26028442,  -0.36157227,   0.22042847,  -0.03222656,  -0.37268066,  -0.03759766,

  258.      0.09909058,   0.23284912,   0.19320679,   0.14453125,  -0.02139282,  -0.19702148,   0.31533813,

  259.     -0.16741943,   0.35031128,  -0.35656738,  -0.66128540,  -0.00701904,   0.20898438,   0.26837158,

  260.     -0.33706665,  -0.04568481,   0.12600708,   0.10284424,   0.07321167,  -0.18280029,   0.38101196,

  261.      0.21301270,   0.04541016,   0.01156616,  -0.26391602,  -0.02346802,  -0.22125244,   0.29760742,

  262.     -0.36233521,  -0.31314087,  -0.13967896,  -0.11276245,  -0.19433594,   0.34490967,   0.02343750,

  263.      0.21963501,  -0.02777100,  -0.67678833,  -0.08999634,   0.14233398,  -0.27697754,   0.51422119,

  264.     -0.05047607,   0.48327637,   0.37167358,  -0.60806274,   0.18728638,  -0.15191650,   0.00637817,

  265.      0.02832031,  -0.15618896,   0.60644531,   0.21826172,   0.06384277,  -0.31863403,   0.08816528,

  266.      0.15447998,  -0.07015991,  -0.08154297,  -0.40966797,  -0.39785767,  -0.11709595,   0.22052002,

  267.      0.18466187,  -0.17257690,   0.03759766,  -0.06195068,   0.00433350,   0.12176514,   0.34011841,

  268.      0.25610352,  -0.05294800,   0.41033936,   0.16854858,  -0.76187134,   0.13845825,  -0.19418335,

  269.     -0.21524048,  -0.44412231,  -0.08160400,  -0.28195190,  -0.01873779,   0.15524292,  -0.37438965,

  270.     -0.44860840,   0.43096924,  -0.24746704,   0.49856567,   0.14859009,   0.38159180,   0.20541382,

  271.     -0.39175415,  -0.65850830,  -0.43716431,   0.13037109,  -0.05111694,   0.39956665,   0.21447754,

  272.     -0.04861450,   0.33654785,   0.10589600,  -0.88085938,  -0.30822754,   0.38577271,   0.30047607,

  273.      0.38836670,   0.09118652,  -0.36477661,  -0.01641846,  -0.23031616,   0.26058960,   0.18859863,

  274.     -0.21868896,  -0.17861938,  -0.29754639,   0.09777832,   0.10806274,  -0.51605225,   0.00076294,

  275.      0.13259888,   0.11090088,  -0.24084473,   0.24957275,   0.01379395,  -0.04141235,  -0.04937744,

  276.      0.57394409,   0.27410889,   0.27587891,   0.45013428,  -0.32592773,   0.11160278,  -0.00970459,

  277.      0.29092407,   0.03356934,  -0.70925903,   0.04882812,   0.43499756,   0.07720947,  -0.27554321,

  278.     -0.01742554,  -0.08413696,  -0.04028320,  -0.52850342,  -0.07330322,   0.05181885,   0.21362305,

  279.     -0.18765259,   0.07058716,  -0.03009033,   0.32662964,   0.27023315,  -0.28002930,   0.17568970,

  280.      0.03338623,   0.30242920,  -0.03921509,   0.32174683,  -0.23733521,   0.08575439,  -0.38269043,

  281.      0.09194946,  -0.07238770,   0.17941284,  -0.51278687,  -0.25146484,   0.19790649,  -0.19195557,

  282.      0.16549683,   0.42456055,   0.39129639,  -0.02868652,   0.17980957,   0.24902344,  -0.76583862,

  283.     -0.20959473,   0.61013794,   0.37011719,   0.36859131,  -0.04486084,   0.10678101,  -0.15994263,

  284.     -0.05328369,   0.28463745,  -0.06420898,  -0.36987305,  -0.28009033,  -0.11764526,   0.04312134,

  285.     -0.08038330,   0.04885864,  -0.03067017,  -0.00042725,   0.34289551,  -0.00988770,   0.34838867,

  286.      0.32516479,  -0.16271973,   0.38269043,   0.03240967,   0.12417603,  -0.14331055,  -0.34902954,

  287.     -0.18325806,   0.29421997,   0.44284058,   0.75170898,  -0.67245483,  -0.12176514,   0.27914429,

  288.     -0.29806519,   0.19863892,   0.30087280,   0.22680664,  -0.36633301,  -0.32534790,  -0.57553101,

  289.     -0.16641235,   0.43811035,   0.08331299,   0.15942383,   0.26516724,  -0.24240112,  -0.11761475,

  290.     -0.16827393,  -0.14260864,   0.46343994,   0.11804199,  -0.55514526,  -0.02520752,  -0.14309692,

  291.      0.00448608,   0.02749634,  -0.30545044,   0.70965576,   0.45108032,   0.66439819,  -0.68255615,

  292.     -0.12496948,   0.09146118,  -0.21109009,  -0.23791504,   0.79943848,  -0.35205078,  -0.24963379,

  293.      0.18719482,  -0.19079590,   0.07458496,   0.07623291,  -0.28781128,  -0.37121582,  -0.19580078,

  294.     -0.01773071,  -0.16717529,   0.13040161,   0.14672852,   0.42379761,   0.03582764,   0.11431885,

  295.      0.05145264,   0.44702148,   0.08963013,   0.01367188,  -0.54519653,  -0.12692261,   0.21176147,

  296.      0.04925537,   0.30670166,  -0.11029053,   0.19555664,  -0.27740479,   0.23043823,   0.15554810,

  297.     -0.19299316,  -0.25729370,   0.17800903,  -0.03579712,  -0.05065918,  -0.06933594,  -0.09500122,

  298.     -0.07821655,   0.23889160,  -0.31900024,   0.03073120,  -0.00415039,   0.61315918,   0.37176514,

  299.     -0.13442993,  -0.15536499,  -0.19216919,  -0.37899780,   0.19992065,   0.02630615,  -0.12573242,

  300.      0.25927734,  -0.02447510,   0.29629517,  -0.40731812,  -0.17333984,   0.24310303,  -0.10607910,

  301.      0.14828491,   0.08792114,  -0.18743896,  -0.05572510,  -0.04833984,   0.10473633,  -0.29028320,

  302.     -0.67687988,  -0.28170776,  -0.41687012,   0.05413818,  -0.23284912,   0.09555054,  -0.08969116,

  303.     -0.15112305,   0.12738037,   0.35986328,   0.28948975,   0.30691528,   0.23956299,   0.06973267,

  304.     -0.31198120,  -0.18450928,   0.22280884,  -0.21600342,   0.23522949,  -0.61840820,  -0.13012695,

  305.      0.26412964,   0.47320557,  -0.26440430,   0.38757324,   0.17352295,  -0.26104736,  -0.25866699,

  306.     -0.12274170,  -0.29733276,   0.07687378,   0.18588257,  -0.08880615,   0.31185913,   0.05313110,

  307.     -0.10885620,  -0.14901733,  -0.22323608,  -0.08538818,   0.19812012,   0.19732666,  -0.18927002,

  308.      0.29058838,   0.25555420,  -0.48599243,   0.18768311,   0.01345825,   0.34887695,   0.21530151,

  309.      0.19857788,   0.18661499,  -0.01394653,  -0.09063721,  -0.38781738,   0.27160645,  -0.20379639,

  310.     -0.32119751,  -0.23889160,   0.27096558,   0.24951172,   0.07922363,   0.07479858,  -0.50946045,

  311.      0.10220337,   0.58364868,  -0.19503784,  -0.18560791,  -0.01165771,   0.47195435,   0.22430420,

  312.     -0.38635254,  -0.03732300,  -0.09179688,   0.06991577,   0.15106201,   0.20605469,  -0.05969238,

  313.     -0.41821289,   0.12231445,  -0.04672241,  -0.05117798,  -0.11523438,  -0.51849365,  -0.04077148,

  314.      0.44284058,  -0.64086914,   0.17019653,   0.02236938,   0.22848511,  -0.23214722,  -0.32354736,

  315.     -0.14068604,  -0.29690552,  -0.19891357,   0.02774048,  -0.20965576,  -0.52191162,  -0.19299316,

  316.     -0.07290649,   0.49053955,  -0.22302246,   0.05642700,   0.13122559,  -0.20819092,  -0.83590698,

  317.     -0.08181763,   0.26797485,  -0.00091553,  -0.09457397,   0.17089844,  -0.27020264,   0.30270386,

  318.      0.05496216,   0.09564209,  -0.08590698,   0.02130127,   0.35931396,   0.21728516,  -0.15396118,

  319.     -0.05053711,   0.02719116,   0.16302490,   0.43212891,   0.10229492,  -0.40820312,   0.21646118,

  320.      0.08435059,  -0.11145020,  -0.39962769,  -0.05618286,  -0.10223389,  -0.60839844,   0.33724976,

  321.     -0.06341553,  -0.47369385,  -0.32852173,   0.05242920,   0.19635010,  -0.19137573,  -0.67901611,

  322.      0.16180420,   0.05133057,  -0.22283936,   0.09646606,   0.24288940,  -0.45007324,   0.08804321,

  323.      0.14053345,   0.22619629,  -0.01000977,   0.36355591,  -0.19863892,  -0.30364990,  -0.24118042,

  324.     -0.57461548,   0.26498413,   0.04345703,  -0.09796143,  -0.47714233,  -0.23739624,   0.18737793,

  325.      0.08926392,  -0.02795410,   0.00305176,  -0.08700562,  -0.38711548,   0.03222656,   0.10940552,

  326.     -0.41906738,  -0.01620483,  -0.47061157,   0.37985229,  -0.21624756,   0.47976685,  -0.20046997,

  327.     -0.62533569,  -0.26907349,  -0.02877808,   0.00671387,  -0.29071045,  -0.24685669,  -0.15722656,

  328.     -0.26055908,   0.29968262,   0.28225708,  -0.08990479,  -0.16748047,  -0.46759033,  -0.25067139,

  329.     -0.25183105,  -0.45932007,   0.05828857,   0.29006958,   0.23840332,  -0.17974854,   0.26931763,

  330.      0.10696411,  -0.06848145,  -0.17126465,  -0.10522461,  -0.55386353,  -0.42306519,  -0.07608032,

  331.      0.24380493,   0.38586426,   0.16882324,   0.26751709,   0.17303467,   0.35809326,  -0.22094727,

  332.     -0.30703735,  -0.28497314,  -0.04321289,   0.15219116,  -0.17071533,  -0.39334106,   0.03439331,

  333.     -0.10809326,  -0.30590820,   0.26449585,  -0.07412720,   0.13638306,  -0.01062012,   0.27996826,

  334.      0.04397583,  -0.05557251,  -0.56933594,   0.03363037,  -0.00949097,   0.52642822,  -0.44329834,

  335.      0.28308105,  -0.05499268,  -0.23312378,  -0.29870605,  -0.05123901,   0.26831055,  -0.35238647,

  336.     -0.30993652,   0.34646606,  -0.19775391,   0.44595337,   0.13769531,   0.45358276,   0.19961548,

  337.      0.42681885,   0.15722656,   0.00128174,   0.23757935,   0.40988159,   0.25164795,  -0.00732422,

  338.     -0.12405396,  -0.43420410,  -0.00402832,   0.34243774,   0.36264038,   0.18807983,  -0.09301758,

  339.     -0.10296631,   0.05532837,  -0.31652832,   0.14337158,   0.35040283,   0.32540894,   0.05728149,

  340.     -0.12030029,  -0.25942993,  -0.20312500,  -0.16491699,  -0.46051025,  -0.08004761,   0.50772095,

  341.      0.16168213,   0.28439331,   0.08105469,  -0.19104004,   0.38589478,  -0.16400146,  -0.25454712,

  342.      0.20281982,  -0.20730591,  -0.06311035,   0.32937622,   0.15032959,  -0.05340576,   0.30487061,

  343.     -0.11648560,   0.38009644,  -0.20062256,   0.43466187,   0.01150513,   0.35754395,  -0.13146973,

  344.      0.67489624,   0.05212402,   0.27914429,  -0.39431763,   0.75308228,  -0.13366699,   0.24453735,

  345.      0.42248535,  -0.65905762,  -0.00546265,  -0.03491211,  -0.13659668,  -0.08294678,  -0.45666504,

  346.      0.27188110,   0.12731934,   0.61148071,   0.10449219,  -0.28836060,   0.00091553,   0.24618530,

  347.      0.13119507,   0.05685425,   0.17355347,   0.42034912,   0.08514404,   0.24536133,   0.18951416,

  348.     -0.19107056,  -0.15036011,   0.02334595,   0.54986572,   0.32321167,  -0.16104126,  -0.03054810,

  349.      0.43594360,   0.17309570,   0.61053467,   0.24731445,   0.33334351,   0.15240479,   0.15588379,

  350.      0.36425781,  -0.30407715,  -0.13302612,   0.00427246,   0.04171753,  -0.33178711,   0.34216309,

  351.     -0.12463379,  -0.02764893,   0.05905151,  -0.31436157,   0.16531372,   0.34542847,  -0.03292847,

  352.      0.12527466,  -0.12313843,  -0.13171387,   0.04757690,  -0.45095825,  -0.19085693,   0.35342407,

  353.     -0.23239136,  -0.34387207,   0.11264038,  -0.15740967,   0.05273438,   0.74942017,   0.21505737,

  354.      0.08514404,  -0.42391968,  -0.19531250,   0.35293579,   0.25305176,   0.15731812,  -0.70324707,

  355.     -0.21591187,   0.35604858,   0.14132690,   0.11724854,   0.15853882,  -0.24597168,   0.07019043,

  356.      0.02127075,   0.12658691,   0.06390381,  -0.12292480,   0.15441895,  -0.47640991,   0.06195068,

  357.      0.58981323,  -0.15151978,  -0.03604126,  -0.45059204,  -0.01672363,  -0.46997070,   0.25750732,

  358.      0.18084717,   0.06661987,   0.13253784,   0.67828369,   0.11370850,   0.11325073,  -0.04611206,

  359.     -0.07791138,  -0.36544800,  -0.06747437,  -0.31594849,   0.16131592,   0.41983032,   0.11071777,

  360.     -0.36889648,   0.30963135,  -0.37875366,   0.58508301,   0.00393677,   0.12338257,   0.03424072,

  361.     -0.21728516,  -0.12838745,  -0.46981812,   0.05868530,  -0.25015259,   0.27407837,   0.65240479,

  362.     -0.34429932,  -0.15179443,   0.14056396,   0.33505249,   0.28826904,   0.09921265,   0.34390259,

  363.      0.13656616,  -0.23608398,   0.00863647,   0.02627563,  -0.19119263,   0.19775391,  -0.07214355,

  364.      0.07809448,   0.03454590,  -0.03417969,   0.00033569,  -0.23095703,   0.18673706,   0.05798340,

  365.      0.03814697,  -0.04318237,   0.05487061,   0.08633423,   0.55950928,  -0.06347656,   0.10333252,

  366.      0.25305176,   0.05853271,   0.12246704,  -0.25543213,  -0.34262085,  -0.36437988,  -0.21304321,

  367.     -0.05093384,   0.02777100,   0.07620239,  -0.21215820,  -0.09326172,   0.19021606,  -0.40579224,

  368.     -0.01193237,   0.19845581,  -0.35336304,  -0.07397461,   0.20104980,   0.08615112,  -0.44375610,

  369.      0.11419678,   0.24453735,  -0.16555786,  -0.05081177,  -0.01406860,   0.27893066,  -0.18692017,

  370.      0.07473755,   0.03451538,  -0.39733887,   0.21548462,  -0.22534180,  -0.39651489,  -0.04989624,

  371.     -0.57662964,   0.06390381,   0.62020874,  -0.13470459,   0.04345703,  -0.21862793,  -0.02789307,

  372.      0.51696777,  -0.27587891,   0.39004517,   0.09857178,  -0.00738525,   0.31317139,   0.00048828,

  373.     -0.46572876,   0.29531860,  -0.10009766,  -0.27856445,   0.03594971,   0.25048828,  -0.74584961,

  374.     -0.25350952,  -0.03302002,   0.31188965,   0.01571655,   0.46710205,   0.21591187,   0.07260132,

  375.     -0.42132568,  -0.53900146,  -0.13674927,  -0.16571045,  -0.34454346,   0.12359619,  -0.11184692,

  376.      0.00967407,   0.34576416,  -0.05761719,   0.34848022,   0.17645264,  -0.39395142,   0.10339355,

  377.      0.18215942,   0.20697021,   0.59109497,  -0.11560059,  -0.07385254,   0.10397339,   0.35437012,

  378.     -0.22863770,   0.01794434,   0.17559814,  -0.17495728,   0.12142944,   0.10928345,  -1.00000000,

  379.     -0.01379395,   0.21237183,  -0.27035522,   0.27319336,  -0.37066650,   0.41354370,  -0.40054321,

  380.      0.00689697,   0.26321411,   0.39266968,   0.65298462,   0.41625977,  -0.13909912,   0.78375244,

  381.     -0.30941772,   0.20169067,  -0.39367676,   0.94021606,  -0.24066162,   0.05557251,  -0.24533081,

  382.     -0.05444336,  -0.76754761,  -0.19375610,  -0.11041260,  -0.17532349,   0.16006470,   0.02188110,

  383.      0.17465210,  -0.04342651,  -0.56777954,  -0.40988159,   0.26687622,   0.11700439,  -0.00344849,

  384.     -0.05395508,   0.37426758,  -0.40719604,  -0.15032959,  -0.01660156,   0.04196167,  -0.04559326,

  385.     -0.12969971,   0.12011719,   0.08419800,  -0.11199951,   0.35174561,   0.10275269,  -0.25686646,

  386.      0.48446655,   0.03225708,   0.28408813,  -0.18701172,   0.36282349,  -0.03280640,   0.32302856,

  387.      0.17233276,   0.48269653,   0.31112671,  -0.04946899,   0.12774658,   0.52685547,   0.10211182,

  388.      0.05953979,   0.05999756,   0.20144653,   0.00744629,   0.27316284,   0.24377441,   0.39672852,

  389.      0.01702881,  -0.35513306,   0.11364746,  -0.13555908,   0.48880005,  -0.15417480,  -0.09149170,

  390.     -0.02615356,   0.46246338,  -0.72250366,   0.22332764,   0.23849487,  -0.25686646,  -0.08514404,

  391.     -0.02062988,  -0.34494019,  -0.02297974,  -0.80386353,  -0.08074951,  -0.12689209,  -0.06896973,

  392.      0.24099731,  -0.35650635,  -0.09558105,   0.29254150,   0.23132324,  -0.16726685,   0.00000000,

  393.     -0.24237061,   0.30899048,   0.29504395,  -0.20898438,   0.17059326,  -0.07672119,  -0.14395142,

  394.      0.05572510,   0.20602417,  -0.51550293,  -0.03167725,  -0.48840332,  -0.20425415,   0.14144897,

  395.      0.07275391,  -0.76669312,  -0.22488403,   0.20651245,   0.03259277,   0.00085449,   0.03039551,

  396.      0.47555542,   0.38351440

  397. };

  398. 

  399. /** Noise level table for power compensation.

  400.  *  Equ: pow(2.0f, (double)(6 - i) / 3.0f) where i = 0...15 */

  401. static const float pwc_levs[16] = {

  402.     3.96875, 3.15625,     2.5,    2.0, 1.59375,   1.25,     1.0, 0.78125,

  403.     0.625,       0.5, 0.40625, 0.3125,    0.25, 0.1875, 0.15625, 0.0

  404. };

  405. 

  406. /** Map subband number to quant unit number. */

  407. static const int subband_to_qu[17] = {

  408.     0, 8, 12, 16, 18, 20, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32

  409. };

  410. 

  411. void ff_atrac3p_power_compensation(Atrac3pChanUnitCtx *ctx, int ch_index,

  412.                                    float *sp, int rng_index, int sb)

  413. {

  414.     AtracGainInfo *g1, *g2;

  415.     float pwcsp[ATRAC3P_SUBBAND_SAMPLES], *dst, grp_lev, qu_lev;

  416.     int i, gain_lev, gcv = 0, qu, nsp;

  417.     int swap_ch = (ctx->unit_type == CH_UNIT_STEREO && ctx->swap_channels[sb]) ? 1 : 0;

  418. 

  419.     if (ctx->channels[ch_index ^ swap_ch].power_levs[subband_to_powgrp[sb]] == ATRAC3P_POWER_COMP_OFF)

  420.         return;

  421. 

  422.     /* generate initial noise spectrum */

  423.     for (i = 0; i < ATRAC3P_SUBBAND_SAMPLES; i++, rng_index++)

  424.         pwcsp[i] = noise_tab[rng_index & 0x3FF];

  425. 

  426.     /* check gain control information */

  427.     g1 = &ctx->channels[ch_index ^ swap_ch].gain_data[sb];

  428.     g2 = &ctx->channels[ch_index ^ swap_ch].gain_data_prev[sb];

  429. 

  430.     gain_lev = (g1->num_points > 0) ? (6 - g1->lev_code[0]) : 0;

  431. 

  432.     for (i = 0; i < g2->num_points; i++)

  433.         gcv = FFMAX(gcv, gain_lev - (g2->lev_code[i] - 6));

  434. 

  435.     for (i = 0; i < g1->num_points; i++)

  436.         gcv = FFMAX(gcv, 6 - g1->lev_code[i]);

  437. 

  438.     grp_lev = pwc_levs[ctx->channels[ch_index ^ swap_ch].power_levs[subband_to_powgrp[sb]]] / (1 << gcv);

  439. 

  440.     /* skip the lowest two quant units (frequencies 0...351 Hz) for subband 0 */

  441.     for (qu = subband_to_qu[sb] + (!sb ? 2 : 0); qu < subband_to_qu[sb + 1]; qu++) {

  442.         if (ctx->channels[ch_index].qu_wordlen[qu] <= 0)

  443.             continue;

  444. 

  445.         qu_lev = ff_atrac3p_sf_tab[ctx->channels[ch_index].qu_sf_idx[qu]] *

  446.                  ff_atrac3p_mant_tab[ctx->channels[ch_index].qu_wordlen[qu]] /

  447.                  (1 << ctx->channels[ch_index].qu_wordlen[qu]) * grp_lev;

  448. 

  449.         dst = &sp[ff_atrac3p_qu_to_spec_pos[qu]];

  450.         nsp = ff_atrac3p_qu_to_spec_pos[qu + 1] - ff_atrac3p_qu_to_spec_pos[qu];

  451. 

  452.         for (i = 0; i < nsp; i++)

  453.             dst[i] += pwcsp[i] * qu_lev;

  454.     }

  455. }

  456. 

  457. void ff_atrac3p_imdct(AVFloatDSPContext *fdsp, FFTContext *mdct_ctx, float *pIn,

  458.                       float *pOut, int wind_id, int sb)

  459. {

  460.     int i;

  461. 

  462.     if (sb & 1)

  463.         for (i = 0; i < ATRAC3P_SUBBAND_SAMPLES / 2; i++)

  464.             FFSWAP(float, pIn[i], pIn[ATRAC3P_SUBBAND_SAMPLES - 1 - i]);

  465. 

  466.     mdct_ctx->imdct_calc(mdct_ctx, pOut, pIn);

  467. 

  468.     /* Perform windowing on the output.

  469.      * ATRAC3+ uses two different MDCT windows:

  470.      * - The first one is just the plain sine window of size 256

  471.      * - The 2nd one is the plain sine window of size 128

  472.      *   wrapped into zero (at the start) and one (at the end) regions.

  473.      *   Both regions are 32 samples long. */

  474.     if (wind_id & 2) { /* 1st half: steep window */

  475.         memset(pOut, 0, sizeof(float) * 32);

  476.         fdsp->vector_fmul(&pOut[32], &pOut[32], ff_sine_64, 64);

  477.     } else /* 1st half: simple sine window */

  478.         fdsp->vector_fmul(pOut, pOut, ff_sine_128, ATRAC3P_MDCT_SIZE / 2);

  479. 

  480.     if (wind_id & 1) { /* 2nd half: steep window */

  481.         fdsp->vector_fmul_reverse(&pOut[160], &pOut[160], ff_sine_64, 64);

  482.         memset(&pOut[224], 0, sizeof(float) * 32);

  483.     } else /* 2nd half: simple sine window */

  484.         fdsp->vector_fmul_reverse(&pOut[128], &pOut[128], ff_sine_128,

  485.                                   ATRAC3P_MDCT_SIZE / 2);

  486. }

  487. 

  488. /* lookup table for fast modulo 23 op required for cyclic buffers of the IPQF */

  489. static const int mod23_lut[26] = {

  490.     23,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11,

  491.     12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 0

  492. };

  493. 

  494. /* First half of the 384-tap IPQF filtering coefficients. */

  495. static const float ipqf_coeffs1[ATRAC3P_PQF_FIR_LEN][16] = {

  496.     { -5.8336207e-7,    -8.0604229e-7,    -4.2005411e-7,    -4.4400572e-8,

  497.        3.226247e-8,      3.530856e-8,      1.2660377e-8,     0.000010516783,

  498.       -0.000011838618,   6.005389e-7,      0.0000014333754,  0.0000023108685,

  499.        0.0000032569742,  0.0000046192422,  0.0000063894258,  0.0000070302972 },

  500.     { -0.0000091622824, -0.000010502935,  -0.0000079212787, -0.0000041712024,

  501.       -0.0000026336629, -0.0000015432918, -5.7168614e-7,     0.0000018111954,

  502.        0.000023530851,   0.00002780562,    0.000032302323,   0.000036968919,

  503.        0.000041575615,   0.000045337845,   0.000046043948,   0.000048585582 },

  504.     { -0.000064464548,  -0.000068306952,  -0.000073081472,  -0.00007612785,

  505.       -0.000074850752,  -0.000070208509,  -0.000062285151,  -0.000058270442,

  506.       -0.000056296329,  -0.000049888811,  -0.000035615325,  -0.000018532943,

  507.        0.0000016657353,  0.00002610587,    0.000053397067,   0.00008079566 },

  508.     { -0.00054488552,   -0.00052537228,   -0.00049731287,   -0.00045778,

  509.       -0.00040612387,   -0.00034301577,   -0.00026866337,   -0.00018248901,

  510.       -0.000084307925,   0.000025081157,   0.00014135583,    0.00026649953,

  511.        0.00039945057,    0.00053928449,    0.00068422867,    0.00083093712 },

  512.     { -0.0014771431,    -0.001283227,     -0.0010566821,    -0.00079780724,

  513.       -0.00050782406,   -0.00018855913,    0.00015771533,    0.00052769453,

  514.        0.00091862219,    0.001326357,      0.0017469483,     0.0021754825,

  515.        0.0026067684,     0.0030352892,     0.0034549395,     0.0038591374 },

  516.     { -0.0022995141,    -0.001443546,     -0.00049266568,    0.00055068987,

  517.        0.001682895,      0.0028992873,     0.0041943151,     0.0055614738,

  518.        0.0069935122,     0.0084823566,     0.010018963,      0.011593862,

  519.        0.013196872,      0.014817309,      0.016444042,      0.018065533 },

  520.     { -0.034426283,     -0.034281436,     -0.033992987,     -0.033563249,

  521.       -0.032995768,     -0.032295227,     -0.031467363,     -0.030518902,

  522.       -0.02945766,      -0.028291954,     -0.027031265,     -0.025685543,

  523.       -0.024265358,     -0.022781773,     -0.021246184,     -0.019670162 },

  524.     { -0.0030586775,    -0.0037203205,    -0.0042847847,    -0.0047529764,

  525.       -0.0051268316,    -0.0054091476,    -0.0056034233,    -0.005714261,

  526.       -0.0057445862,    -0.0057025906,    -0.0055920109,    -0.0054194843,

  527.       -0.0051914565,    -0.0049146507,    -0.0045959447,    -0.0042418269 },

  528.     { -0.0016376863,    -0.0017651899,    -0.0018608454,    -0.0019252141,

  529.       -0.0019593791,    -0.0019653172,    -0.0019450618,    -0.0018990048,

  530.       -0.00183808,      -0.0017501717,    -0.0016481078,    -0.0015320742,

  531.       -0.0014046903,    -0.0012685474,    -0.001125814,     -0.00097943726 },

  532.     { -0.00055432378,   -0.00055472925,   -0.00054783461,   -0.00053276919,

  533.       -0.00051135791,   -0.00048466062,   -0.00045358928,   -0.00042499689,

  534.       -0.00036942671,   -0.0003392619,    -0.00030001783,   -0.00025986304,

  535.       -0.0002197204,    -0.00018116167,   -0.00014691355,   -0.00011279432 },

  536.     { -0.000064147389,  -0.00006174868,   -0.000054267788,  -0.000047133824,

  537.       -0.000042927582,  -0.000039477309,  -0.000036340745,  -0.000029687517,

  538.       -0.000049787737,  -0.000041577889,  -0.000033864744,  -0.000026534748,

  539.       -0.000019841305,  -0.000014789486,  -0.000013131184,  -0.0000099198869 },

  540.     { -0.0000062990207, -0.0000072701259, -0.000011984052,  -0.000017348082,

  541.       -0.000019907106,  -0.000021348773,  -0.000021961965,  -0.000012203576,

  542.       -0.000010840992,   4.6299544e-7,     5.2588763e-7,     2.7792686e-7,

  543.       -2.3649704e-7,    -0.0000010897784, -9.171448e-7,     -5.22682e-7 }

  544. };

  545. 

  546. /* Second half of the 384-tap IPQF filtering coefficients. */

  547. static const float ipqf_coeffs2[ATRAC3P_PQF_FIR_LEN][16] = {

  548.     {  5.22682e-7,       9.171448e-7,      0.0000010897784,  2.3649704e-7,

  549.       -2.7792686e-7,    -5.2588763e-7,    -4.6299544e-7,     0.000010840992,

  550.       -0.000012203576,  -0.000021961965,  -0.000021348773,  -0.000019907106,

  551.       -0.000017348082,  -0.000011984052,  -0.0000072701259, -0.0000062990207 },

  552.     {  0.0000099198869,  0.000013131184,   0.000014789486,   0.000019841305,

  553.        0.000026534748,   0.000033864744,   0.000041577889,   0.000049787737,

  554.       -0.000029687517,  -0.000036340745,  -0.000039477309,  -0.000042927582,

  555.       -0.000047133824,  -0.000054267788,  -0.00006174868,   -0.000064147389 },

  556.     {  0.00011279432,    0.00014691355,    0.00018116167,    0.0002197204,

  557.        0.00025986304,    0.00030001783,    0.0003392619,     0.00036942671,

  558.       -0.00042499689,   -0.00045358928,   -0.00048466062,   -0.00051135791,

  559.       -0.00053276919,   -0.00054783461,   -0.00055472925,   -0.00055432378 },

  560.     {  0.00097943726,    0.001125814,      0.0012685474,     0.0014046903,

  561.        0.0015320742,     0.0016481078,     0.0017501717,     0.00183808,

  562.       -0.0018990048,    -0.0019450618,    -0.0019653172,    -0.0019593791,

  563.       -0.0019252141,    -0.0018608454,    -0.0017651899,    -0.0016376863 },

  564.     {  0.0042418269,     0.0045959447,     0.0049146507,     0.0051914565,

  565.        0.0054194843,     0.0055920109,     0.0057025906,     0.0057445862,

  566.       -0.005714261,     -0.0056034233,    -0.0054091476,    -0.0051268316,

  567.       -0.0047529764,    -0.0042847847,    -0.0037203205,    -0.0030586775 },

  568.     {  0.019670162,      0.021246184,      0.022781773,      0.024265358,

  569.        0.025685543,      0.027031265,      0.028291954,      0.02945766,

  570.       -0.030518902,     -0.031467363,     -0.032295227,     -0.032995768,

  571.       -0.033563249,     -0.033992987,     -0.034281436,     -0.034426283 },

  572.     { -0.018065533,     -0.016444042,     -0.014817309,     -0.013196872,

  573.       -0.011593862,     -0.010018963,     -0.0084823566,    -0.0069935122,

  574.        0.0055614738,     0.0041943151,     0.0028992873,     0.001682895,

  575.        0.00055068987,   -0.00049266568,   -0.001443546,     -0.0022995141 },

  576.     { -0.0038591374,    -0.0034549395,    -0.0030352892,    -0.0026067684,

  577.       -0.0021754825,    -0.0017469483,    -0.001326357,     -0.00091862219,

  578.        0.00052769453,    0.00015771533,   -0.00018855913,   -0.00050782406,

  579.       -0.00079780724,   -0.0010566821,    -0.001283227,     -0.0014771431 },

  580.     { -0.00083093712,   -0.00068422867,   -0.00053928449,   -0.00039945057,

  581.       -0.00026649953,   -0.00014135583,   -0.000025081157,   0.000084307925,

  582.       -0.00018248901,   -0.00026866337,   -0.00034301577,   -0.00040612387,

  583.       -0.00045778,      -0.00049731287,   -0.00052537228,   -0.00054488552 },

  584.     { -0.00008079566,   -0.000053397067,  -0.00002610587,   -0.0000016657353,

  585.        0.000018532943,   0.000035615325,   0.000049888811,   0.000056296329,

  586.       -0.000058270442,  -0.000062285151,  -0.000070208509,  -0.000074850752,

  587.       -0.00007612785,   -0.000073081472,  -0.000068306952,  -0.000064464548 },

  588.     { -0.000048585582,  -0.000046043948,  -0.000045337845,  -0.000041575615,

  589.       -0.000036968919,  -0.000032302323,  -0.00002780562,   -0.000023530851,

  590.        0.0000018111954, -5.7168614e-7,    -0.0000015432918, -0.0000026336629,

  591.       -0.0000041712024, -0.0000079212787, -0.000010502935,  -0.0000091622824 },

  592.     { -0.0000070302972, -0.0000063894258, -0.0000046192422, -0.0000032569742,

  593.       -0.0000023108685, -0.0000014333754, -6.005389e-7,      0.000011838618,

  594.        0.000010516783,   1.2660377e-8,     3.530856e-8,      3.226247e-8,

  595.       -4.4400572e-8,    -4.2005411e-7,    -8.0604229e-7,    -5.8336207e-7 }

  596. };

  597. 

  598. void ff_atrac3p_ipqf(FFTContext *dct_ctx, Atrac3pIPQFChannelCtx *hist,

  599.                      const float *in, float *out)

  600. {

  601.     int i, s, sb, t, pos_now, pos_next;

  602.     DECLARE_ALIGNED(32, float, idct_in)[ATRAC3P_SUBBANDS];

  603.     DECLARE_ALIGNED(32, float, idct_out)[ATRAC3P_SUBBANDS];

  604. 

  605.     memset(out, 0, ATRAC3P_FRAME_SAMPLES * sizeof(*out));

  606. 

  607.     for (s = 0; s < ATRAC3P_SUBBAND_SAMPLES; s++) {

  608.         /* pick up one sample from each subband */

  609.         for (sb = 0; sb < ATRAC3P_SUBBANDS; sb++)

  610.             idct_in[sb] = in[sb * ATRAC3P_SUBBAND_SAMPLES + s];

  611. 

  612.         /* Calculate the sine and cosine part of the PQF using IDCT-IV */

  613.         dct_ctx->imdct_half(dct_ctx, idct_out, idct_in);

  614. 

  615.         /* append the result to the history */

  616.         for (i = 0; i < 8; i++) {

  617.             hist->buf1[hist->pos][i] = idct_out[i + 8];

  618.             hist->buf2[hist->pos][i] = idct_out[7 - i];

  619.         }

  620. 

  621.         pos_now  = hist->pos;

  622.         pos_next = mod23_lut[pos_now + 2]; // pos_next = (pos_now + 1) % 23;

  623. 

  624.         for (t = 0; t < ATRAC3P_PQF_FIR_LEN; t++) {

  625.             for (i = 0; i < 8; i++) {

  626.                 out[s * 16 + i + 0] += hist->buf1[pos_now][i]  * ipqf_coeffs1[t][i] +

  627.                                        hist->buf2[pos_next][i] * ipqf_coeffs2[t][i];

  628.                 out[s * 16 + i + 8] += hist->buf1[pos_now][7 - i]  * ipqf_coeffs1[t][i + 8] +

  629.                                        hist->buf2[pos_next][7 - i] * ipqf_coeffs2[t][i + 8];

  630.             }

  631. 

  632.             pos_now  = mod23_lut[pos_next + 2]; // pos_now  = (pos_now  + 2) % 23;

  633.             pos_next = mod23_lut[pos_now + 2];  // pos_next = (pos_next + 2) % 23;

  634.         }

  635. 

  636.         hist->pos = mod23_lut[hist->pos]; // hist->pos = (hist->pos - 1) % 23;

  637.     }

  638. }