SDRPlusPlus/rtl_tcp_source/src/main.cpp

#include <rtltcp_client.h>
#include <imgui.h>
#include <spdlog/spdlog.h>
#include <module.h>
#include <gui/gui.h>
#include <signal_path/signal_path.h>
#include <core.h>
#include <gui/style.h>

#define CONCAT(a, b) ((std::string(a) + b).c_str())

MOD_INFO {
    /* Name:        */ "fike_source",
    /* Description: */ "File input module for SDR++",
    /* Author:      */ "Ryzerth",
    /* Version:     */ "0.1.0"
};

class RTLTCPSourceModule {
public:
    RTLTCPSourceModule(std::string name) {
        this->name = name;

        stream.init(100);

        sampleRate = 2560000.0;

        handler.ctx = this;
        handler.selectHandler = menuSelected;
        handler.deselectHandler = menuDeselected;
        handler.menuHandler = menuHandler;
        handler.startHandler = start;
        handler.stopHandler = stop;
        handler.tuneHandler = tune;
        handler.stream = &stream;
        sigpath::sourceManager.registerSource("RTL-TCP", &handler);

        spdlog::info("RTLTCPSourceModule '{0}': Instance created!", name);
    }

    ~RTLTCPSourceModule() {
        spdlog::info("RTLTCPSourceModule '{0}': Instance deleted!", name);
    }

private:
    static void menuSelected(void* ctx) {
        RTLTCPSourceModule* _this = (RTLTCPSourceModule*)ctx;
        core::setInputSampleRate(_this->sampleRate);
        spdlog::info("RTLTCPSourceModule '{0}': Menu Select!", _this->name);
    }

    static void menuDeselected(void* ctx) {
        RTLTCPSourceModule* _this = (RTLTCPSourceModule*)ctx;
        spdlog::info("RTLTCPSourceModule '{0}': Menu Deselect!", _this->name);
    }
    
    static void start(void* ctx) {
        RTLTCPSourceModule* _this = (RTLTCPSourceModule*)ctx;
        if (!_this->client.connectToRTL(_this->ip, _this->port)) {
            spdlog::error("Could not connect to {0}:{1}", _this->ip, _this->port);
            return;
        }
        _this->client.setFrequency(_this->freq);
        _this->client.setSampleRate(_this->sampleRate);
        _this->client.setGainIndex(_this->gain);
        _this->client.setGainMode(!_this->tunerAGC);
        _this->client.setDirectSampling(_this->directSamplingMode);
        _this->client.setAGCMode(_this->rtlAGC);
        _this->running = true;
        _this->workerThread = std::thread(worker, _this);
        spdlog::info("RTLTCPSourceModule '{0}': Start!", _this->name);
    }
    
    static void stop(void* ctx) {
        RTLTCPSourceModule* _this = (RTLTCPSourceModule*)ctx;
        _this->running = false;
        _this->stream.stopWriter();
        _this->workerThread.join();
        _this->stream.clearWriteStop();
        _this->client.disconnect();
        spdlog::info("RTLTCPSourceModule '{0}': Stop!", _this->name);
    }
    
    static void tune(double freq, void* ctx) {
        RTLTCPSourceModule* _this = (RTLTCPSourceModule*)ctx;
        if (_this->running) {
            _this->client.setFrequency(freq);
        }
        _this->freq = freq;
        spdlog::info("RTLTCPSourceModule '{0}': Tune: {1}!", _this->name, freq);
    }
    
    static void menuHandler(void* ctx) {
        RTLTCPSourceModule* _this = (RTLTCPSourceModule*)ctx;
        float menuWidth = ImGui::GetContentRegionAvailWidth();
        float portWidth = ImGui::CalcTextSize("00000").x + 20;

        ImGui::SetNextItemWidth(menuWidth - portWidth);
        ImGui::InputText(CONCAT("##_ip_select_", _this->name), _this->ip, 1024);
        ImGui::SameLine();
        ImGui::SetNextItemWidth(portWidth);
        ImGui::InputInt(CONCAT("##_port_select_", _this->name), &_this->port, 0);

        ImGui::SetNextItemWidth(ImGui::CalcTextSize("OOOOOOOOOO").x);
        if (ImGui::Combo("Direct sampling", &_this->directSamplingMode, "Disabled\0I branch\0Q branch\0")) {
            if (_this->running) {
                _this->client.setDirectSampling(_this->directSamplingMode);
            }
        }

        if (ImGui::Checkbox("RTL AGC", &_this->rtlAGC)) {
            if (_this->running) {
                _this->client.setAGCMode(_this->rtlAGC);
            }
        }

        if (ImGui::Checkbox("Tuner AGC", &_this->tunerAGC)) {
            if (_this->running) {
                _this->client.setGainMode(!_this->tunerAGC);
                if (!_this->tunerAGC) {
                    _this->client.setGainIndex(_this->gain);
                }
            }
        }

        if (_this->tunerAGC) { style::beginDisabled(); }
        ImGui::SetNextItemWidth(menuWidth);
        if (ImGui::SliderInt(CONCAT("##_gain_select_", _this->name), &_this->gain, 0, 29, "")) {
            if (_this->running) {
                _this->client.setGainIndex(_this->gain);
            }
        }
        if (_this->tunerAGC) { style::endDisabled(); }
    }

    static void worker(void* ctx) {
        RTLTCPSourceModule* _this = (RTLTCPSourceModule*)ctx;
        int blockSize = _this->sampleRate / 200.0;
        uint8_t* inBuf = new uint8_t[blockSize * 2];
        dsp::complex_t* outBuf = new dsp::complex_t[blockSize];

        _this->stream.setMaxLatency(blockSize * 2);

        while (true) {
            // Read samples here
            _this->client.receiveData(inBuf, blockSize * 2);
            for (int i = 0; i < blockSize; i++) {
                outBuf[i].q = ((double)inBuf[i * 2] - 128.0) / 128.0;
                outBuf[i].i = ((double)inBuf[(i * 2) + 1] - 128.0) / 128.0;
            }
            if (_this->stream.write(outBuf, blockSize) < 0) { break; };
        }

        delete[] inBuf;
        delete[] outBuf;
    }

    std::string name;
    dsp::stream<dsp::complex_t> stream;
    double sampleRate;
    SourceManager::SourceHandler handler;
    std::thread workerThread;
    RTLTCPClient client;
    bool running = false;
    double freq;
    char ip[1024] = "localhost";
    int port = 1234;
    int gain = 0;
    bool rtlAGC = false;
    bool tunerAGC = false;
    int directSamplingMode = 0;
};

MOD_EXPORT void _INIT_() {
   // Do your one time init here
}

MOD_EXPORT void* _CREATE_INSTANCE_(std::string name) {
    return new RTLTCPSourceModule(name);
}

MOD_EXPORT void _DELETE_INSTANCE_(void* instance) {
    delete (RTLTCPSourceModule*)instance;
}

MOD_EXPORT void _STOP_() {
    // Do your one shutdown here
}