159 lines
4.5 KiB
C++
159 lines
4.5 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_sstvtx.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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// This is called at 3072000/2048 = 1500Hz
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void SSTVTXProcessor::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 (!sample_count) {
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// This FSM is a mess. It seems to do a lot where it shouldn't (I/Q loop),
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// but it actually doesn't do much. Used for sequencing the different parts
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// of the scanline. Todo: simplify !
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if (state == STATE_CALIBRATION) {
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// Once per picture
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tone_delta = calibration_sequence[substep].first;
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sample_count = calibration_sequence[substep].second;
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if (substep == 2) {
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substep = 0;
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state = STATE_VIS;
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} else
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substep++;
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} else if (state == STATE_VIS) {
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// Once per picture
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if (substep == 10) {
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current_scanline = &scanline_buffer[buffer_flip];
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buffer_flip ^= 1;
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// Ask application for a new scanline
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shared_memory.application_queue.push(sig_message);
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// Do we have to transmit a start tone ?
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if (current_scanline->start_tone.duration) {
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state = STATE_SYNC;
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tone_delta = current_scanline->start_tone.frequency;
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sample_count = current_scanline->start_tone.duration;
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} else {
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state = STATE_PIXELS;
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tone_delta = current_scanline->gap_tone.frequency;
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sample_count = current_scanline->gap_tone.duration;
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}
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} else {
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tone_delta = vis_code_sequence[substep];
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sample_count = SSTV_MS2S(30); // A VIS code bit is 30ms
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substep++;
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}
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} else if (state == STATE_SYNC) {
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// Once per scanline, optional
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state = STATE_PIXELS;
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tone_delta = current_scanline->gap_tone.frequency;
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sample_count = current_scanline->gap_tone.duration;
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} else if (state == STATE_PIXELS) {
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// Many times per scanline
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tone_delta = SSTV_F2D(1500 + ((current_scanline->luma[pixel_index] * 800) / 256));
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sample_count = pixel_duration;
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pixel_index++;
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if (pixel_index >= 320) {
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// Scanline done, (dirty) state jump
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pixel_index = 0;
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state = STATE_VIS;
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substep = 10;
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}
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}
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} else {
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sample_count--;
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}
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// Tone synth
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tone_sample = (sine_table_i8[(tone_phase & 0xFF000000U) >> 24]);
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tone_phase += tone_delta;
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// FM
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delta = tone_sample * fm_delta;
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phase += delta;
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sphase = phase + (64 << 24);
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re = (sine_table_i8[(sphase & 0xFF000000U) >> 24]);
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im = (sine_table_i8[(phase & 0xFF000000U) >> 24]);
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buffer.p[i] = {re, im};
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}
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}
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void SSTVTXProcessor::on_message(const Message* const msg) {
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const auto message = *reinterpret_cast<const SSTVConfigureMessage*>(msg);
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uint8_t vis_code;
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switch(msg->id) {
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case Message::ID::SSTVConfigure:
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pixel_duration = message.pixel_duration;
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if (!pixel_duration) {
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configured = false; // Shutdown
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return;
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}
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vis_code = message.vis_code;
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// VIS code:
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// 1200, (0=1300, 1=1100), 1200
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vis_code_sequence[0] = SSTV_VIS_SS;
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for (uint32_t c = 0; c < 8; c++)
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vis_code_sequence[c + 1] = ((vis_code >> c) & 1) ? SSTV_VIS_ONE : SSTV_VIS_ZERO;
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vis_code_sequence[9] = SSTV_VIS_SS;
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fm_delta = 9000 * (0xFFFFFFULL / 3072000); // Fixed bw for now
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pixel_index = 0;
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sample_count = 0;
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tone_phase = 0;
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state = STATE_CALIBRATION;
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substep = 0;
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configured = true;
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break;
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case Message::ID::FIFOData:
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memcpy(&scanline_buffer[buffer_flip], static_cast<const FIFODataMessage*>(msg)->data, sizeof(sstv_scanline));
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break;
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default:
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break;
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}
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}
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int main() {
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EventDispatcher event_dispatcher { std::make_unique<SSTVTXProcessor>() };
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event_dispatcher.run();
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return 0;
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}
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