portapack-mayhem/firmware/baseband/proc_am_tv.cpp

/*
 * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
 * Copyright (C) 2016 Furrtek
 * Copyright (C) 2020 Shao
 *
 * This file is part of PortaPack.
 *
 * 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 2, 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; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#include "proc_am_tv.hpp"

#include "portapack_shared_memory.hpp"
#include "dsp_fft.hpp"
#include "event_m4.hpp"

#include <cstdint>

void WidebandFMAudio::execute(const buffer_c8_t& buffer) {
    if (!configured) {
        return;
    }

    std::fill(spectrum.begin(), spectrum.end(), 0);

    for (size_t i = 0; i < spectrum.size(); i++) {
        spectrum[i] += buffer.p[i];
    }

    const buffer_c16_t buffer_c16{spectrum.data(), spectrum.size(), buffer.sampling_rate};
    channel_spectrum.feed(buffer_c16);

    int8_t re;
    // int8_t im;
    // int8_t mag;

    for (size_t i = 0; i < 128; i++) {
        re = buffer.p[i].real();
        // im = buffer.p[i].imag();
        // mag = __builtin_sqrtf((re * re) + (im * im)) ;
        const unsigned int v = re + 127.0f;  // timescope
        audio_spectrum.db[i] = std::max(0U, std::min(255U, v));
    }
    AudioSpectrumMessage message{&audio_spectrum};
    shared_memory.application_queue.push(message);
}

void WidebandFMAudio::on_message(const Message* const message) {
    switch (message->id) {
        case Message::ID::UpdateSpectrum:
        case Message::ID::SpectrumStreamingConfig:
            channel_spectrum.on_message(message);
            break;

        case Message::ID::WFMConfigure:
            configure(*reinterpret_cast<const WFMConfigureMessage*>(message));
            break;

        default:
            break;
    }
}

void WidebandFMAudio::configure(const WFMConfigureMessage& message) {
    (void)message;  // avoid warning
    configured = true;
}

int main() {
    EventDispatcher event_dispatcher{std::make_unique<WidebandFMAudio>()};
    event_dispatcher.run();
    return 0;
}