146 lines
3.6 KiB
C++
146 lines
3.6 KiB
C++
// Copyright (c) Charles J. Cliffe
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// SPDX-License-Identifier: GPL-2.0+
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#include "ModemFSK.h"
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#include <iomanip>
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ModemFSK::ModemFSK() : ModemDigital() {
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// DMR defaults?
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bps = 1;
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sps = 9600;
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bw = 0.45;
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outStream << std::hex;
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}
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ModemBase *ModemFSK::factory() {
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return new ModemFSK;
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}
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int ModemFSK::checkSampleRate(long long sampleRate, int audioSampleRate) {
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float minSps = pow(2.0,bps);
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float nextSps = (float(sampleRate) / float(sps));
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if (nextSps < minSps) {
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return 2 * bps * sps;
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} else {
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return sampleRate;
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}
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}
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int ModemFSK::getDefaultSampleRate() {
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return 19200;
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}
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ModemArgInfoList ModemFSK::getSettings() {
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ModemArgInfoList args;
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ModemArgInfo bpsArg;
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bpsArg.key = "bps";
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bpsArg.name = "Bits/symbol";
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bpsArg.value = std::to_string(bps);
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bpsArg.description = "Modem bits-per-symbol";
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bpsArg.type = ModemArgInfo::STRING;
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bpsArg.units = "bits";
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std::vector<std::string> bpsOpts;
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bpsOpts.push_back("1");
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bpsOpts.push_back("2");
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bpsOpts.push_back("4");
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bpsOpts.push_back("8");
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bpsOpts.push_back("16");
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bpsArg.options = bpsOpts;
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args.push_back(bpsArg);
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ModemArgInfo spsArg;
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spsArg.key = "sps";
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spsArg.name = "Symbols/second";
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spsArg.value = std::to_string(sps);
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spsArg.description = "Modem symbols-per-second";
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spsArg.type = ModemArgInfo::INT;
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spsArg.range = ModemRange(10,115200);
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std::vector<std::string> spsOpts;
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args.push_back(spsArg);
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ModemArgInfo bwArg;
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bwArg.key = "bw";
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bwArg.name = "Signal bandwidth";
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bwArg.value = std::to_string(bw);
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bwArg.description = "Total signal bandwidth";
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bwArg.type = ModemArgInfo::FLOAT;
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bwArg.range = ModemRange(0.1,0.49);
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args.push_back(bwArg);
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return args;
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}
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void ModemFSK::writeSetting(std::string setting, std::string value) {
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if (setting == "bps") {
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bps = std::stoi(value);
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rebuildKit();
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} else if (setting == "sps") {
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sps = std::stoi(value);
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rebuildKit();
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} else if (setting == "bw") {
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bw = std::stof(value);
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rebuildKit();
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}
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}
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std::string ModemFSK::readSetting(std::string setting) {
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if (setting == "bps") {
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return std::to_string(bps);
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} else if (setting == "sps") {
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return std::to_string(sps);
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} else if (setting == "bw") {
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return std::to_string(bw);
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}
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return "";
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}
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ModemKit *ModemFSK::buildKit(long long sampleRate, int audioSampleRate) {
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ModemKitFSK *dkit = new ModemKitFSK;
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dkit->m = bps;
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dkit->k = sampleRate / sps;
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dkit->bw = bw;
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dkit->demodFSK = fskdem_create(dkit->m, dkit->k, dkit->bw);
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dkit->sampleRate = sampleRate;
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dkit->audioSampleRate = audioSampleRate;
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return dkit;
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}
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void ModemFSK::disposeKit(ModemKit *kit) {
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ModemKitFSK *dkit = (ModemKitFSK *)kit;
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fskdem_destroy(dkit->demodFSK);
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delete dkit;
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}
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std::string ModemFSK::getName() {
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return "FSK";
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}
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ModemFSK::~ModemFSK() {
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}
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void ModemFSK::demodulate(ModemKit *kit, ModemIQData *input, AudioThreadInput *audioOut) {
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ModemKitFSK *dkit = (ModemKitFSK *)kit;
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digitalStart(dkit, nullptr, input);
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dkit->inputBuffer.insert(dkit->inputBuffer.end(),input->data.begin(),input->data.end());
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while (dkit->inputBuffer.size() >= dkit->k) {
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outStream << fskdem_demodulate(dkit->demodFSK, &dkit->inputBuffer[0]);
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// float err = fskdem_get_frequency_error(dkit->demodFSK);
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dkit->inputBuffer.erase(dkit->inputBuffer.begin(),dkit->inputBuffer.begin()+dkit->k);
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}
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digitalFinish(dkit, nullptr);
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} |