mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-13 19:54:39 +00:00
123 lines
3.1 KiB
C++
123 lines
3.1 KiB
C++
/*
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* Copyright (C) 2015 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_xylos.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 XylosProcessor::execute(const buffer_c8_t& buffer) {
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// This is called at 1536000/2048 = 750Hz
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if (!configured) return;
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for (size_t i = 0; i<buffer.count; i++) {
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// Tone generation at 1536000/5 = 307.2kHz
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if (s >= (5 - 1)) {
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s = 0;
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if (silence) {
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// Just occupy channel with carrier
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if (sample_count >= CCIR_SILENCE) {
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silence = false;
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sample_count = CCIR_TONELENGTH;
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} else {
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sample_count++;
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}
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} else {
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if (sample_count >= CCIR_TONELENGTH) {
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digit = xylosdata[byte_pos++];
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if ((digit == 0xFF) || (byte_pos >= 21)) {
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configured = false;
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message.n = 25; // End of message code
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shared_memory.application_queue.push(message);
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} else {
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message.n = byte_pos; // Inform UI about progress (just as eye candy)
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shared_memory.application_queue.push(message);
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}
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sample_count = 0;
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} else {
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sample_count++;
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}
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tone_phase += ccir_phases[digit];
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}
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} else {
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s++;
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}
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if (silence) {
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re = 0;
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im = 0;
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} else {
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tone_sample = (sine_table_i8[(tone_phase & 0x03FC0000)>>18]);
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// Audio preview sample generation: 1536000/48000 = 32
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/*if (as >= 31) {
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as = 0;
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audio[ai++] = sample * 128;
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} else {
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as++;
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}*/
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// FM
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// 1<<18 = 262144
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// m = (262144 * BW) / 1536000 / 2
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frq = tone_sample * 853; // 10kHz BW
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phase = (phase + frq);
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sphase = phase + (64<<18);
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re = (sine_table_i8[(sphase & 0x03FC0000)>>18]);
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im = (sine_table_i8[(phase & 0x03FC0000)>>18]);
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}
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buffer.p[i] = {(int8_t)re,(int8_t)im};
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}
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//audio_output.write(audio_buffer);
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}
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void XylosProcessor::on_message(const Message* const p) {
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const auto message = *reinterpret_cast<const XylosConfigureMessage*>(p);
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if (message.id == Message::ID::XylosConfigure) {
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memcpy(xylosdata, message.ccir_message, 21);
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byte_pos = 0;
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digit = 0;
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sample_count = CCIR_TONELENGTH;
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as = 0;
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silence = true;
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configured = true;
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}
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}
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int main() {
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EventDispatcher event_dispatcher { std::make_unique<XylosProcessor>() };
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event_dispatcher.run();
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return 0;
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}
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