SDRPlusPlus/file_source/src/main.cpp

#include <imgui.h>
#include <spdlog/spdlog.h>
#include <module.h>
#include <gui/gui.h>
#include <signal_path/signal_path.h>
#include <wavreader.h>
#include <core.h>
#include <gui/widgets/file_select.h>

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

SDRPP_MOD_INFO {
    /* Name:            */ "file_source",
    /* Description:     */ "Wav file source module for SDR++",
    /* Author:          */ "Ryzerth",
    /* Version:         */ 0, 1, 1,
    /* Max instances    */ 1
};


class FileSourceModule : public ModuleManager::Instance  {
public:
    FileSourceModule(std::string name) : fileSelect("") {
        this->name = name;

        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("File", &handler);

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

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

    void enable() {
        enabled = true;
    }

    void disable() {
        enabled = false;
    }

    bool isEnabled() {
        return enabled;
    }

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

    static void menuDeselected(void* ctx) {
        FileSourceModule* _this = (FileSourceModule*)ctx;
        spdlog::info("FileSourceModule '{0}': Menu Deselect!", _this->name);
    }
    
    static void start(void* ctx) {
        FileSourceModule* _this = (FileSourceModule*)ctx;
        if (_this->running) { return; }
        if (_this->reader == NULL) { return; }
        _this->running = true;
        _this->workerThread = _this->float32Mode ? std::thread(floatWorker, _this) : std::thread(worker, _this);
        spdlog::info("FileSourceModule '{0}': Start!", _this->name);
    }
    
    static void stop(void* ctx) {
        FileSourceModule* _this = (FileSourceModule*)ctx;
        if (!_this->running) { return; }
        if (_this->reader == NULL) { return; }
        _this->stream.stopWriter();
        _this->workerThread.join();
        _this->stream.clearWriteStop();
        _this->running = false;
        _this->reader->rewind();
        spdlog::info("FileSourceModule '{0}': Stop!", _this->name);
    }
    
    static void tune(double freq, void* ctx) {
        FileSourceModule* _this = (FileSourceModule*)ctx;
        spdlog::info("FileSourceModule '{0}': Tune: {1}!", _this->name, freq);
    }
    
    static void menuHandler(void* ctx) {
        FileSourceModule* _this = (FileSourceModule*)ctx;

        if (_this->fileSelect.render("##file_source_" + _this->name)) {
            if (_this->fileSelect.pathIsValid()) {
                if (_this->reader != NULL) {
                    _this->reader->close();
                    delete _this->reader;
                }
                try {
                    _this->reader = new WavReader(_this->fileSelect.path);
                    _this->sampleRate = _this->reader->getSampleRate();
                    core::setInputSampleRate(_this->sampleRate);
                }
                catch (std::exception e) {}
            }
        }

        ImGui::Checkbox("Float32 Mode##_file_source", &_this->float32Mode);
    }

    static void worker(void* ctx) {
        FileSourceModule* _this = (FileSourceModule*)ctx;
        double sampleRate = _this->reader->getSampleRate();
        int blockSize = sampleRate / 200.0f;
        int16_t* inBuf = new int16_t[blockSize * 2];

        while (true) {
            _this->reader->readSamples(inBuf, blockSize * 2 * sizeof(int16_t));
            for (int i = 0; i < blockSize; i++) {
                _this->stream.writeBuf[i].re = (float)inBuf[i * 2] / (float)0x7FFF;
                _this->stream.writeBuf[i].im = (float)inBuf[(i * 2) + 1] / (float)0x7FFF;
            }
            if (!_this->stream.swap(blockSize)) { break; };
        }

        delete[] inBuf;
    }

    static void floatWorker(void* ctx) {
        FileSourceModule* _this = (FileSourceModule*)ctx;
        double sampleRate = _this->reader->getSampleRate();
        int blockSize = sampleRate / 200.0f;
        dsp::complex_t* inBuf = new dsp::complex_t[blockSize];

        while (true) {
            _this->reader->readSamples(_this->stream.writeBuf, blockSize * sizeof(dsp::complex_t));
            if (!_this->stream.swap(blockSize)) { break; };
        }

        delete[] inBuf;
    }

    FileSelect fileSelect;
    std::string name;
    dsp::stream<dsp::complex_t> stream;
    SourceManager::SourceHandler handler;
    WavReader* reader = NULL;
    bool running = false;
    bool enabled = true;
    float sampleRate = 48000;
    std::thread workerThread;

    bool float32Mode = false;
};

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

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

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

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