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/*
* This file is part of AtracDEnc.
*
* AtracDEnc 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.
*
* AtracDEnc 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 AtracDEnc; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "atrac_psy_common.h"
////////////////////////////////////////////////////////////////////////////////
namespace {
/*
* Borrowed from Musepack.
* https://www.musepack.net/
*/
static float
ATHformula_Frank ( float freq )
{
/*
* one value per 100 cent = 1
* semitone = 1/4
* third = 1/12
* octave = 1/40 decade
* rest is linear interpolated, values are currently in millibel rel. 20 µPa
*/
static short tab [] = {
/* 10.0 */ 9669, 9669, 9626, 9512,
/* 12.6 */ 9353, 9113, 8882, 8676,
/* 15.8 */ 8469, 8243, 7997, 7748,
/* 20.0 */ 7492, 7239, 7000, 6762,
/* 25.1 */ 6529, 6302, 6084, 5900,
/* 31.6 */ 5717, 5534, 5351, 5167,
/* 39.8 */ 5004, 4812, 4638, 4466,
/* 50.1 */ 4310, 4173, 4050, 3922,
/* 63.1 */ 3723, 3577, 3451, 3281,
/* 79.4 */ 3132, 3036, 2902, 2760,
/* 100.0 */ 2658, 2591, 2441, 2301,
/* 125.9 */ 2212, 2125, 2018, 1900,
/* 158.5 */ 1770, 1682, 1594, 1512,
/* 199.5 */ 1430, 1341, 1260, 1198,
/* 251.2 */ 1136, 1057, 998, 943,
/* 316.2 */ 887, 846, 744, 712,
/* 398.1 */ 693, 668, 637, 606,
/* 501.2 */ 580, 555, 529, 502,
/* 631.0 */ 475, 448, 422, 398,
/* 794.3 */ 375, 351, 327, 322,
/* 1000.0 */ 312, 301, 291, 268,
/* 1258.9 */ 246, 215, 182, 146,
/* 1584.9 */ 107, 61, 13, -35,
/* 1995.3 */ -96, -156, -179, -235,
/* 2511.9 */ -295, -350, -401, -421,
/* 3162.3 */ -446, -499, -532, -535,
/* 3981.1 */ -513, -476, -431, -313,
/* 5011.9 */ -179, 8, 203, 403,
/* 6309.6 */ 580, 736, 881, 1022,
/* 7943.3 */ 1154, 1251, 1348, 1421,
/* 10000.0 */ 1479, 1399, 1285, 1193,
/* 12589.3 */ 1287, 1519, 1914, 2369,
#if 0
/* 15848.9 */ 3352, 4865, 5942, 6177,
/* 19952.6 */ 6385, 6604, 6833, 7009,
/* 25118.9 */ 7066, 7127, 7191, 7260,
#else
/* 15848.9 */ 3352, 4352, 5352, 6352,
/* 19952.6 */ 7352, 8352, 9352, 9999,
/* 25118.9 */ 9999, 9999, 9999, 9999,
#endif
};
double freq_log;
unsigned index;
if ( freq < 10. ) freq = 10.;
if ( freq > 29853. ) freq = 29853.;
freq_log = 40. * log10 (0.1 * freq); /* 4 steps per third, starting at 10 Hz */
index = (unsigned) freq_log;
return 0.01 * (tab [index] * (1 + index - freq_log) + tab [index+1] * (freq_log - index));
}
} // namespace
////////////////////////////////////////////////////////////////////////////////
namespace NAtracDEnc {
using std::vector;
//returns 1 for tone-like, 0 - noise-like
TFloat AnalizeScaleFactorSpread(const vector<TScaledBlock>& scaledBlocks)
{
TFloat s = 0.0;
for (size_t i = 0; i < scaledBlocks.size(); ++i) {
s += scaledBlocks[i].ScaleFactorIndex;
}
s /= scaledBlocks.size();
TFloat sigma = 0.0;
TFloat t = 0.0;
for (size_t i = 0; i < scaledBlocks.size(); ++i) {
t = (scaledBlocks[i].ScaleFactorIndex - s);
t *= t;
sigma += t;
}
sigma /= scaledBlocks.size();
sigma = sqrt(sigma);
if (sigma > 14.0)
sigma = 14.0;
return sigma/14.0;
}
vector<float> CalcATH(int len, int sampleRate)
{
vector<float> res(len);
float mf = (float)sampleRate / 2000.0;
for (size_t i = 0; i < res.size(); i++) {
const float f = (float)(i+1) * mf / len; // Frequency in kHz
float trh = ATHformula_Frank(1.e3 * f) - 100;
// tmp -= f * f * (int)(EarModelFlag % 100 - 50) * 0.0015; // 00: +30 dB, 100: -30 dB @20 kHz
trh -= f * f * 0.015;
res[i] = trh;
}
return res;
}
} // namespace NAtracDEnc
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