portapack-mayhem/firmware/baseband/dsp_modulate.hpp

/*
 * Copyright (C) 2020 Belousov Oleg
 *
 * 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.
 */

#ifndef __DSP_MODULATE_H__
#define __DSP_MODULATE_H__

#include "dsp_types.hpp"
#include "dsp_hilbert.hpp"
#include "tone_gen.hpp"
#include "baseband_processor.hpp"

namespace dsp {
namespace modulate {

enum class Mode {
    None,
    AM,
    DSB,
    LSB,
    USB,
    FM
};

///

class Modulator {
   public:
    virtual void execute(const buffer_s16_t& audio, const buffer_c8_t& buffer, bool& configured_in, uint32_t& new_beep_index, uint32_t& new_beep_timer, TXProgressMessage& new_txprogress_message, AudioLevelReportMessage& new_level_message, uint32_t& new_power_acc_count, uint32_t& new_divider) = 0;
    virtual ~Modulator();

    Mode get_mode();
    void set_mode(Mode new_mode);

    void set_over(uint32_t new_over);
    void set_gain_shiftbits_vumeter_beep(float new_audio_gain, uint8_t new_audio_shift_bits_s16, bool new_play_beep);
    int32_t apply_beep(int32_t sample_in, bool& configured_in, uint32_t& new_beep_index, uint32_t& new_beep_timer, TXProgressMessage& new_txprogress_message);
    float audio_gain{};
    uint8_t audio_shift_bits_s16_FM{};  // shift bits factor to the captured ADC S16 audio sample.
    uint8_t audio_shift_bits_s16_AM_DSB_SSB{};
    bool play_beep{false};
    uint32_t power_acc_count{0};  // this var it is initialized from Proc_mictx.cpp
    uint32_t divider{};           // this var it is initialized from Proc_mictx.cpp
    uint64_t power_acc{0};        // it is aux Accumulated sum (Absolute sample signal) , initialitzed to zero.
    AudioLevelReportMessage level_message{};

   private:
    static constexpr size_t baseband_fs = 1536000U;
    TXProgressMessage txprogress_message{};
    ToneGen beep_gen{};
    uint32_t beep_index{}, beep_timer{};

   protected:
    uint32_t over = 1;
    Mode mode = Mode::None;
};

///

class SSB : public Modulator {
   public:
    SSB();

    virtual void execute(const buffer_s16_t& audio, const buffer_c8_t& buffer, bool& configured_in, uint32_t& new_beep_index, uint32_t& new_beep_timer, TXProgressMessage& new_txprogress_message, AudioLevelReportMessage& new_level_message, uint32_t& new_power_acc_count, uint32_t& new_divider);

   private:
    dsp::HilbertTransform hilbert;
};

///

class FM : public Modulator {
   public:
    FM();

    virtual void execute(const buffer_s16_t& audio, const buffer_c8_t& buffer, bool& configured_in, uint32_t& new_beep_index, uint32_t& new_beep_timer, TXProgressMessage& new_txprogress_message, AudioLevelReportMessage& new_level_message, uint32_t& new_power_acc_count, uint32_t& new_divider);
    void set_fm_delta(uint32_t new_delta);
    void set_tone_gen_configure(const uint32_t delta, const float tone_mix_weight);

    ///

   private:
    uint32_t fm_delta{0};
    uint32_t phase{0}, sphase{0};
    int32_t sample{0}, delta{};
    ToneGen tone_gen{};
};

class AM : public Modulator {
   public:
    AM();

    virtual void execute(const buffer_s16_t& audio, const buffer_c8_t& buffer, bool& configured_in, uint32_t& new_beep_index, uint32_t& new_beep_timer, TXProgressMessage& new_txprogress_message, AudioLevelReportMessage& new_level_message, uint32_t& new_power_acc_count, uint32_t& new_divider);
};

} /* namespace modulate */
} /* namespace dsp */

#endif /*__DSP_MODULATE_H__*/