mirror of
https://github.com/eried/portapack-mayhem.git
synced 2024-12-30 17:56:33 -05:00
116 lines
3.3 KiB
C++
116 lines
3.3 KiB
C++
/*
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* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
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* Copyright (C) 2016 Furrtek
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*
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* This file is part of PortaPack.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include "proc_jammer.hpp"
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#include "portapack_shared_memory.hpp"
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#include "sine_table_int8.hpp"
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#include "event_m4.hpp"
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#include <cstdint>
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void JammerProcessor::execute(const buffer_c8_t& buffer) {
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if (!configured) return;
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for (size_t i = 0; i < buffer.count; i++) {
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if (!jammer_duration) {
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// Find next enabled range
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do {
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current_range++;
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if (current_range == JAMMER_MAX_CH) current_range = 0;
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} while (!jammer_channels[current_range].enabled);
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jammer_duration = jammer_channels[current_range].duration;
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jammer_bw = jammer_channels[current_range].width / 2; // TODO: Exact value
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// Ask for retune
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message.freq = jammer_channels[current_range].center;
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message.range = current_range;
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shared_memory.application_queue.push(message);
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} else {
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jammer_duration--;
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}
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// Phase noise
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if (!period_counter) {
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period_counter = noise_period;
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if (noise_type == JammerType::TYPE_FSK) {
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sample = (sample + lfsr) >> 1;
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} else if (noise_type == JammerType::TYPE_TONE) {
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tone_delta = 150000 + (lfsr >> 9); // Approx 100Hz to 6kHz
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} else if (noise_type == JammerType::TYPE_SWEEP) {
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sample++; // This is like saw wave FM
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}
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feedback = ((lfsr >> 31) ^ (lfsr >> 29) ^ (lfsr >> 15) ^ (lfsr >> 11)) & 1;
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lfsr = (lfsr << 1) | feedback;
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if (!lfsr) lfsr = 0x1337; // Shouldn't do this :(
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} else {
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period_counter--;
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}
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if (noise_type == JammerType::TYPE_TONE) {
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aphase += tone_delta;
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sample = sine_table_i8[(aphase & 0xFF000000) >> 24];
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}
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delta = sample * jammer_bw;
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phase += delta;
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sphase = phase + (64 << 24);
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re = (sine_table_i8[(sphase & 0xFF000000) >> 24]);
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im = (sine_table_i8[(phase & 0xFF000000) >> 24]);
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buffer.p[i] = {re, im};
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}
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};
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void JammerProcessor::on_message(const Message* const msg) {
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if (msg->id == Message::ID::JammerConfigure) {
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const auto message = *reinterpret_cast<const JammerConfigureMessage*>(msg);
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if (message.run) {
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jammer_channels = (JammerChannel*)shared_memory.bb_data.data;
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noise_type = message.type;
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noise_period = 3072000 / message.speed;
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if (noise_type == JammerType::TYPE_SWEEP)
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noise_period >>= 8;
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period_counter = 0;
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jammer_duration = 0;
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current_range = 0;
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lfsr = 0xDEAD0012;
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configured = true;
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} else {
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configured = false;
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}
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}
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}
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int main() {
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EventDispatcher event_dispatcher { std::make_unique<JammerProcessor>() };
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event_dispatcher.run();
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return 0;
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}
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