/***************************************************************************
 *   Copyright (C) 2021 - 2025 by Federico Amedeo Izzo IU2NUO,             *
 *                                Niccolò Izzo IU2KIN                      *
 *                                Wojciech Kaczmarski SP5WWP               *
 *                                Frederik Saraci IU2NRO                   *
 *                                Silvano Seva IU2KWO                      *
 *                                                                         *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 3 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program 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 General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, see <http://www.gnu.org/licenses/>   *
 ***************************************************************************/

#ifndef M17_DSP_H
#define M17_DSP_H

#ifndef __cplusplus
#error This header is C++ only!
#endif

#include "core/fir.hpp"
#include <array>

namespace M17
{

/*
 * Coefficients for M17 RRC filters
 */
static constexpr std::array<float, 81> rrc_taps_48k =
{
    -0.003195702904062073, -0.002930279157647190, -0.001940667871554463,
    -0.000356087678023658,  0.001547011339077758,  0.003389554791179751,
     0.004761898604225673,  0.005310860846138910,  0.004824746306020221,
     0.003297923526848786,  0.000958710871218619, -0.001749908029791816,
    -0.004238694106631223, -0.005881783042101693, -0.006150256456781309,
    -0.004745376707651645, -0.001704189656473565,  0.002547854551539951,
     0.007215575568844704,  0.011231038205363532,  0.013421952197060707,
     0.012730475385624438,  0.008449554307303753,  0.000436744366018287,
    -0.010735380379191660, -0.023726883538258272, -0.036498030780605324,
    -0.046500883189991064, -0.050979050575999614, -0.047340680079891187,
    -0.033554880492651755, -0.008513823955725943,  0.027696543159614194,
     0.073664520037517042,  0.126689053778116234,  0.182990955139333916,
     0.238080025892859704,  0.287235637987091563,  0.326040247765297220,
     0.350895727088112619,  0.359452932027607974,  0.350895727088112619,
     0.326040247765297220,  0.287235637987091563,  0.238080025892859704,
     0.182990955139333916,  0.126689053778116234,  0.073664520037517042,
     0.027696543159614194, -0.008513823955725943, -0.033554880492651755,
    -0.047340680079891187, -0.050979050575999614, -0.046500883189991064,
    -0.036498030780605324, -0.023726883538258272, -0.010735380379191660,
     0.000436744366018287,  0.008449554307303753,  0.012730475385624438,
     0.013421952197060707,  0.011231038205363532,  0.007215575568844704,
     0.002547854551539951, -0.001704189656473565, -0.004745376707651645,
    -0.006150256456781309, -0.005881783042101693, -0.004238694106631223,
    -0.001749908029791816,  0.000958710871218619,  0.003297923526848786,
     0.004824746306020221,  0.005310860846138910,  0.004761898604225673,
     0.003389554791179751,  0.001547011339077758, -0.000356087678023658,
    -0.001940667871554463, -0.002930279157647190, -0.003195702904062073,
};

static constexpr std::array<float, 41> rrc_taps_24k =
{
    -0.002021130037130002, -0.001227380092907312,  0.000978411066065117,
     0.003011674298801149,  0.003051422479929027,  0.000606339011138998,
    -0.002680772347838965, -0.003889744583281823, -0.001077818873364855,
     0.004563508234396922,  0.008488746155946006,  0.005343941074480147,
    -0.006789617306671533, -0.023083267913613266, -0.032241823935683658,
    -0.021221865389865011,  0.017516745763008643,  0.080124798723015214,
     0.150574288667793071,  0.206204943905808818,  0.227336876945597260,
     0.206204943905808818,  0.150574288667793071,  0.080124798723015214,
     0.017516745763008643, -0.021221865389865011, -0.032241823935683658,
    -0.023083267913613266, -0.006789617306671533,  0.005343941074480147,
     0.008488746155946006,  0.004563508234396922, -0.001077818873364855,
    -0.003889744583281823, -0.002680772347838965,  0.000606339011138998,
     0.003051422479929027,  0.003011674298801149,  0.000978411066065117,
    -0.001227380092907312, -0.002021130037130002,
};

/*
 * FIR implementations of the RRC filter for baseband audio generation.
 */
extern Fir< std::tuple_size< decltype(rrc_taps_48k) >::value > rrc_48k;
extern Fir< std::tuple_size< decltype(rrc_taps_24k) >::value > rrc_24k;

} /* M17 */

#endif /* M17_DSP_H */