Merge pull request #40 from AlexandreRouma/better_dsp

Better dsp

.gitignore

@@ -1,3 +1,10 @@
 build/
 .vscode/
 *.old
+*.dll
+*.exe
+*.zip
+*.wav
+.DS_Store
+sdrpp_v0.2.5_beta_x64
+sdrpp_v0.2.5_beta_x64_new_wf

CMakeLists.txt

@@ -1,59 +1,46 @@
-cmake_minimum_required(VERSION 3.9)
+cmake_minimum_required(VERSION 3.13)
 project(sdrpp)
 
+# Core of SDR++
+add_subdirectory("core")
+
+# Cross platform modules
+add_subdirectory("radio")
+add_subdirectory("recorder") 
+add_subdirectory("soapy_source")
+#add_subdirectory("file_source")
+add_subdirectory("rtl_tcp_source")
+add_subdirectory("audio_sink")
+#add_subdirectory("rx888_source")
+add_subdirectory("plutosdr_source")
+#add_subdirectory("demo")
+
 if (MSVC)
-    set(CMAKE_CXX_FLAGS "-O2 /std:c++17")
+    set(CMAKE_CXX_FLAGS "-O2 /std:c++17 /EHsc")
-    link_directories(sdrpp "C:/Program Files/PothosSDR/lib/")
-    include_directories(sdrpp "C:/Program Files/PothosSDR/include/volk/")
-    include_directories(sdrpp "C:/Program Files/PothosSDR/include/")
 else()
-    set(CMAKE_CXX_FLAGS "-O3 -std=c++17 -fsanitize=address -g")
+    set(CMAKE_CXX_FLAGS "-O3 -std=c++17")
-    include_directories(sdrpp "/usr/include/volk")
-    link_libraries(pthread)
-    link_libraries(GL)
-    link_libraries(GLEW)
-    link_libraries(glfw)
-    link_libraries(fftw3)
-    link_libraries(fftw3f)
-    link_libraries(portaudio)
-    link_libraries(X11)
-    link_libraries(Xxf86vm)
 endif (MSVC)
 
-link_libraries(volk)
+add_executable(sdrpp "src/main.cpp" "win32/resources.rc")
-link_libraries(SoapySDR)
+target_link_libraries(sdrpp PRIVATE sdrpp_core)
-
-# Main code
-include_directories(sdrpp "src/")
-include_directories(sdrpp "src/imgui")
-file(GLOB SRC "src/*.cpp")
-file(GLOB IMGUI "src/imgui/*.cpp")
-add_executable(sdrpp ${SRC} ${IMGUI})
 
+# Copy dynamic libs over
 if (MSVC)
-    # Glew
+    add_custom_target(do_always ALL xcopy /s \"$<TARGET_FILE_DIR:sdrpp_core>\\*.dll\" \"$<TARGET_FILE_DIR:sdrpp>\" /Y)
-    find_package(GLEW REQUIRED)
+    add_custom_target(do_always_volk ALL xcopy /s \"C:/Program Files/PothosSDR/bin\\volk.dll\" \"$<TARGET_FILE_DIR:sdrpp>\" /Y)
-    target_link_libraries(sdrpp PRIVATE GLEW::GLEW)
-
-    # GLFW3
-    find_package(glfw3 CONFIG REQUIRED)
-    target_link_libraries(sdrpp PRIVATE glfw)
-
-    # FFTW3
-    find_package(FFTW3 CONFIG REQUIRED)
-    target_link_libraries(sdrpp PRIVATE FFTW3::fftw3)
-    find_package(FFTW3f CONFIG REQUIRED)
-    target_link_libraries(sdrpp PRIVATE FFTW3::fftw3f)
-
-    # PortAudio
-    find_package(portaudio CONFIG REQUIRED)
-    target_link_libraries(sdrpp PRIVATE portaudio portaudio_static)
 endif (MSVC)
 
-# # Copy resource directories
+
-# if (!MSVC)
+if (${CMAKE_SYSTEM_NAME} MATCHES "OpenBSD")
-#     add_custom_command(TARGET sdrpp POST_BUILD COMMAND cmake -E copy_directory ${CMAKE_SOURCE_DIR}/res ${CMAKE_BINARY_DIR}/res)
+    add_custom_target(do_always ALL cp \"$<TARGET_FILE_DIR:sdrpp_core>/libsdrpp_core.so\" \"$<TARGET_FILE_DIR:sdrpp>\")
-#     add_custom_command(TARGET sdrpp POST_BUILD COMMAND cmake -E copy_directory ${CMAKE_SOURCE_DIR}/bandplans ${CMAKE_BINARY_DIR}/bandplans)
+endif ()
-# endif (MSVC)
+
+if (${CMAKE_SYSTEM_NAME} MATCHES "Linux")
+    add_custom_target(do_always ALL cp \"$<TARGET_FILE_DIR:sdrpp_core>/libsdrpp_core.so\" \"$<TARGET_FILE_DIR:sdrpp>\")
+endif ()
+
+if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
+    add_custom_target(do_always ALL cp \"$<TARGET_FILE_DIR:sdrpp_core>/libsdrpp_core.dylib\" \"$<TARGET_FILE_DIR:sdrpp>\")
+endif ()
 
 # cmake .. "-DCMAKE_TOOLCHAIN_FILE=C:/Users/Alex/vcpkg/scripts/buildsystems/vcpkg.cmake" -G "Visual Studio 15 2017 Win64"

airspy_hf_source/CMakeLists.txt

@@ -0,0 +1,20 @@
+cmake_minimum_required(VERSION 3.13)
+project(airspy_hf_source)
+
+if (MSVC)
+    set(CMAKE_CXX_FLAGS "-O2 /std:c++17 /EHsc")
+else()
+    set(CMAKE_CXX_FLAGS "-O3 -std=c++17 -fpermissive")
+endif (MSVC)
+
+include_directories("src/")
+
+file(GLOB SRC "src/*.cpp")
+
+add_library(airspy_hf_source SHARED ${SRC})
+target_link_libraries(airspy_hf_source PRIVATE sdrpp_core)
+set_target_properties(airspy_hf_source PROPERTIES PREFIX "")
+
+if(WIN32)
+  target_link_libraries(airspy_hf_source PRIVATE wsock32 ws2_32)
+endif()

airspy_hf_source/src/main.cpp

@@ -0,0 +1,192 @@
+#include <imgui.h>
+#include <spdlog/spdlog.h>
+#include <new_module.h>
+#include <gui/gui.h>
+#include <signal_path/signal_path.h>
+#include <core.h>
+#include <gui/style.h>
+#include <libairspyhf/airspyhf.h>
+
+#define CONCAT(a, b) ((std::string(a) + b).c_str())
+
+SDRPP_MOD_INFO {
+    /* Name:            */ "airspy_hf_source",
+    /* Description:     */ "Airspy HF source module for SDR++",
+    /* Author:          */ "Ryzerth",
+    /* Version:         */ 0, 1, 0,
+    /* Max instances    */ 1
+};
+
+class AirspyHFSourceModule : public ModuleManager::Instance {
+public:
+    AirspyHFSourceModule(std::string name) {
+        this->name = name;
+
+        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("Airspy HF+", &handler);
+    }
+
+    ~AirspyHFSourceModule() {
+        
+    }
+
+    void enable() {
+        enabled = true;
+    }
+
+    void disable() {
+        enabled = false;
+    }
+
+    bool isEnabled() {
+        return enabled;
+    }
+
+private:
+    static void menuSelected(void* ctx) {
+        AirspyHFSourceModule* _this = (AirspyHFSourceModule*)ctx;
+        core::setInputSampleRate(_this->sampleRate);
+        spdlog::info("AirspyHFSourceModule '{0}': Menu Select!", _this->name);
+    }
+
+    static void menuDeselected(void* ctx) {
+        AirspyHFSourceModule* _this = (AirspyHFSourceModule*)ctx;
+        spdlog::info("AirspyHFSourceModule '{0}': Menu Deselect!", _this->name);
+    }
+    
+    static void start(void* ctx) {
+        AirspyHFSourceModule* _this = (AirspyHFSourceModule*)ctx;
+        if (_this->running) {
+            return;
+        }
+        // DO START HERE
+        _this->running = true;
+        _this->workerThread = std::thread(worker, _this);
+        spdlog::info("AirspyHFSourceModule '{0}': Start!", _this->name);
+    }
+    
+    static void stop(void* ctx) {
+        AirspyHFSourceModule* _this = (AirspyHFSourceModule*)ctx;
+        if (!_this->running) {
+            return;
+        }
+        // DO STOP HERE
+        _this->running = false;
+        _this->stream.stopWriter();
+        _this->workerThread.join();
+        _this->stream.clearWriteStop();
+        spdlog::info("AirspyHFSourceModule '{0}': Stop!", _this->name);
+    }
+    
+    static void tune(double freq, void* ctx) {
+        AirspyHFSourceModule* _this = (AirspyHFSourceModule*)ctx;
+        if (_this->running) {
+            _this->client.setFrequency(freq);
+        }
+        _this->freq = freq;
+        spdlog::info("AirspyHFSourceModule '{0}': Tune: {1}!", _this->name, freq);
+    }
+    
+    static void menuHandler(void* ctx) {
+        AirspyHFSourceModule* _this = (AirspyHFSourceModule*)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) {
+        AirspyHFSourceModule* _this = (AirspyHFSourceModule*)ctx;
+        int blockSize = _this->sampleRate / 200.0;
+        uint8_t* inBuf = new uint8_t[blockSize * 2];
+
+        while (true) {
+            // Read samples here
+            _this->client.receiveData(inBuf, blockSize * 2);
+            if (_this->stream.aquire() < 0) { break; }
+            for (int i = 0; i < blockSize; i++) {
+                _this->stream.data[i].q = ((double)inBuf[i * 2] - 128.0) / 128.0;
+                _this->stream.data[i].i = ((double)inBuf[(i * 2) + 1] - 128.0) / 128.0;
+            }
+            _this->stream.write(blockSize);
+        }
+
+        delete[] inBuf;
+    }
+
+    std::string name;
+    bool enabled = true;
+    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 ModuleManager::Instance* _CREATE_INSTANCE_(std::string name) {
+    return new AirspyHFSourceModule(name);
+}
+
+MOD_EXPORT void _DELETE_INSTANCE_(ModuleManager::Instance* instance) {
+    delete (AirspyHFSourceModule*)instance;
+}
+
+MOD_EXPORT void _END_() {
+    // Do your one shutdown here
+}

audio_sink/CMakeLists.txt

@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.13)
+project(audio_sink)
+
+if (MSVC)
+    set(CMAKE_CXX_FLAGS "-O2 /std:c++17 /EHsc")
+else()
+    set(CMAKE_CXX_FLAGS "-O3 -std=c++17 -fpermissive")
+endif (MSVC)
+
+file(GLOB SRC "src/*.cpp")
+
+include_directories("src/")
+
+add_library(audio_sink SHARED ${SRC})
+target_link_libraries(audio_sink PRIVATE sdrpp_core)
+set_target_properties(audio_sink PROPERTIES PREFIX "")

audio_sink/src/main.cpp

@@ -0,0 +1,287 @@
+#include <imgui.h>
+#include <new_module.h>
+#include <gui/gui.h>
+#include <signal_path/signal_path.h>
+#include <signal_path/sink.h>
+#include <portaudio.h>
+#include <dsp/audio.h>
+#include <spdlog/spdlog.h>
+
+#define CONCAT(a, b) ((std::string(a) + b).c_str())
+
+SDRPP_MOD_INFO {
+    /* Name:            */ "audio_sink",
+    /* Description:     */ "Audio sink module for SDR++",
+    /* Author:          */ "Ryzerth",
+    /* Version:         */ 0, 1, 0,
+    /* Max instances    */ 1
+};
+
+class AudioSink : SinkManager::Sink {
+public:
+    struct AudioDevice_t {
+        std::string name;
+        int index;
+        int channels;
+        int srId;
+        std::vector<double> sampleRates;
+        std::string txtSampleRates;
+    };
+    
+    AudioSink(SinkManager::Stream* stream, std::string streamName) {
+        _stream = stream;
+        _streamName = streamName;
+        s2m.init(_stream->sinkOut);
+        monoRB.init(&s2m.out);
+        stereoRB.init(_stream->sinkOut);
+
+        // Initialize PortAudio
+        Pa_Initialize();
+        devCount = Pa_GetDeviceCount();
+        devId = Pa_GetDefaultOutputDevice();
+        const PaDeviceInfo *deviceInfo;
+        PaStreamParameters outputParams;
+        outputParams.sampleFormat = paFloat32;
+        outputParams.hostApiSpecificStreamInfo = NULL;
+
+        // Gather hardware info
+        for(int i = 0; i < devCount; i++) {
+            deviceInfo = Pa_GetDeviceInfo(i);
+            if (deviceInfo->maxOutputChannels < 1) {
+                continue;
+            }
+            AudioDevice_t dev;
+            dev.name = deviceInfo->name;
+            dev.index = i;
+            dev.channels = std::min<int>(deviceInfo->maxOutputChannels, 2);
+            dev.sampleRates.clear();
+            dev.txtSampleRates = "";
+            for (int j = 0; j < 6; j++) {
+                outputParams.channelCount = dev.channels;
+                outputParams.device = dev.index;
+                outputParams.suggestedLatency = deviceInfo->defaultLowOutputLatency;
+                PaError err = Pa_IsFormatSupported(NULL, &outputParams, POSSIBLE_SAMP_RATE[j]);
+                if (err != paFormatIsSupported) {
+                    continue;
+                }
+                dev.sampleRates.push_back(POSSIBLE_SAMP_RATE[j]);
+                dev.txtSampleRates += std::to_string((int)POSSIBLE_SAMP_RATE[j]);
+                dev.txtSampleRates += '\0';
+            }
+            if (dev.sampleRates.size() == 0) {
+                continue;
+            }
+            if (i == devId) {
+                devListId = devices.size();
+                defaultDev = devListId;
+            }
+            dev.srId = 0;
+
+            AudioDevice_t* _dev = new AudioDevice_t;
+            *_dev = dev;
+            devices.push_back(_dev);
+
+            deviceNames.push_back(deviceInfo->name);
+            txtDevList += deviceInfo->name;
+            txtDevList += '\0';
+        }
+
+        // Load config from file
+    }
+
+    ~AudioSink() {
+        for (auto const& dev : devices) {
+            delete dev;
+        }
+    }
+
+    void start() {
+        if (running) {
+            return;
+        }
+        doStart();
+        running = true;
+    }
+
+    void stop() {
+        if (!running) {
+            return;
+        }
+        doStop();
+        running = false;
+    }
+    
+    void menuHandler() {
+        float menuWidth = ImGui::GetContentRegionAvailWidth();
+
+        ImGui::SetNextItemWidth(menuWidth);
+        if (ImGui::Combo(("##_audio_sink_dev_"+_streamName).c_str(), &devListId, txtDevList.c_str())) {
+            // TODO: Load SR from config
+            if (running) {
+                doStop();
+                doStart();
+            }
+            // TODO: Save to config
+        }
+
+        AudioDevice_t* dev = devices[devListId];
+
+        ImGui::SetNextItemWidth(menuWidth);
+        if (ImGui::Combo(("##_audio_sink_sr_"+_streamName).c_str(), &dev->srId, dev->txtSampleRates.c_str())) {
+            _stream->setSampleRate(dev->sampleRates[dev->srId]);
+            if (running) {
+                doStop();
+                doStart();
+            }
+            // TODO: Save to config
+        }
+    }
+
+private:
+    void doStart() {
+        const PaDeviceInfo *deviceInfo;
+        AudioDevice_t* dev = devices[devListId];
+        PaStreamParameters outputParams;
+        deviceInfo = Pa_GetDeviceInfo(dev->index);
+        outputParams.channelCount = 2;
+        outputParams.sampleFormat = paFloat32;
+        outputParams.hostApiSpecificStreamInfo = NULL;
+        outputParams.device = dev->index;
+        outputParams.suggestedLatency = Pa_GetDeviceInfo(outputParams.device)->defaultLowOutputLatency;
+        PaError err;
+
+        float sampleRate = dev->sampleRates[dev->srId];
+        int bufferSize = sampleRate / 60.0f;
+
+        if (dev->channels == 2) {
+            stereoRB.data.setMaxLatency(bufferSize * 2);
+            stereoRB.start();
+            err = Pa_OpenStream(&stream, NULL, &outputParams, sampleRate, paFramesPerBufferUnspecified, 0, _stereo_cb, this);
+        }
+        else {
+            monoRB.data.setMaxLatency(bufferSize * 2);
+            monoRB.start();
+            err = Pa_OpenStream(&stream, NULL, &outputParams, sampleRate, paFramesPerBufferUnspecified, 0, _mono_cb, this);
+        }
+
+        if (err != 0) {
+            spdlog::error("Error while opening audio stream: ({0}) => {1}", err, Pa_GetErrorText(err));
+            return;
+        }
+
+        err = Pa_StartStream(stream);
+        if (err != 0) {
+            spdlog::error("Error while starting audio stream: ({0}) => {1}", err, Pa_GetErrorText(err));
+            return;
+        }
+        spdlog::info("Audio device open.");
+        running = true;
+    }
+
+    void doStop() {
+        monoRB.stop();
+        stereoRB.stop();
+        monoRB.data.stopReader();
+        stereoRB.data.stopReader();
+        Pa_StopStream(stream);
+        Pa_CloseStream(stream);
+        monoRB.data.clearReadStop();
+        stereoRB.data.clearReadStop();
+    }
+
+    static int _mono_cb(const void *input, void *output, unsigned long frameCount,
+        const PaStreamCallbackTimeInfo* timeInfo, PaStreamCallbackFlags statusFlags, void *userData) {
+        AudioSink* _this = (AudioSink*)userData;
+        _this->monoRB.data.read((float*)output, frameCount);
+        return 0;
+    }
+
+    static int _stereo_cb(const void *input, void *output, unsigned long frameCount,
+        const PaStreamCallbackTimeInfo* timeInfo, PaStreamCallbackFlags statusFlags, void *userData) {
+        AudioSink* _this = (AudioSink*)userData;
+        _this->stereoRB.data.read((dsp::stereo_t*)output, frameCount);
+        return 0;
+    }
+    
+    SinkManager::Stream* _stream;
+    dsp::StereoToMono s2m;
+    dsp::RingBufferSink<float> monoRB;
+    dsp::RingBufferSink<dsp::stereo_t> stereoRB;
+    std::string _streamName;
+    PaStream *stream;
+
+    int srId = 0;
+    int devCount;
+    int devId = 0;
+    int devListId = 0;
+    int defaultDev = 0;
+    bool running = false;
+
+    const double POSSIBLE_SAMP_RATE[6] = {
+        48000.0f,
+        44100.0f,
+        24000.0f,
+        22050.0f,
+        12000.0f,
+        11025.0f
+    };
+
+    std::vector<AudioDevice_t*> devices;
+    std::vector<std::string> deviceNames;
+    std::string txtDevList;
+
+};
+
+class AudioSinkModule : public ModuleManager::Instance {
+public:
+    AudioSinkModule(std::string name) {
+        this->name = name;
+        provider.create = create_sink;
+        provider.ctx = this;
+        sigpath::sinkManager.registerSinkProvider("Audio", provider);
+    }
+
+    ~AudioSinkModule() {
+
+    }
+
+    void enable() {
+        enabled = true;
+    }
+
+    void disable() {
+        enabled = false;
+    }
+
+    bool isEnabled() {
+        return enabled;
+    }
+
+private:
+    static SinkManager::Sink* create_sink(SinkManager::Stream* stream, std::string streamName, void* ctx) {
+        return (SinkManager::Sink*)(new AudioSink(stream, streamName));
+    }
+
+    std::string name;
+    bool enabled = true;
+    SinkManager::SinkProvider provider;
+
+};
+
+MOD_EXPORT void _INIT_() {
+    // Nothing here
+    // TODO: Do instancing here (in source modules as well) to prevent multiple loads
+}
+
+MOD_EXPORT void* _CREATE_INSTANCE_(std::string name) {
+    AudioSinkModule* instance = new AudioSinkModule(name);
+    return instance;
+}
+
+MOD_EXPORT void _DELETE_INSTANCE_() {
+    
+}
+
+MOD_EXPORT void _END_() {
+    
+}

core/CMakeLists.txt

@@ -0,0 +1,103 @@
+cmake_minimum_required(VERSION 3.13)
+project(sdrpp_core)
+
+# Set compiler options
+if (MSVC)
+    set(CMAKE_CXX_FLAGS "-O2 /std:c++17 /EHsc")
+    set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
+else()
+    set(CMAKE_CXX_FLAGS "-g -O3 -std=c++17 -fpermissive")
+endif (MSVC)
+add_definitions(-DSDRPP_IS_CORE)
+
+# Main code
+file(GLOB_RECURSE SRC "src/*.cpp" "src/*.c")
+
+# Add code to dyn lib
+add_library(sdrpp_core SHARED ${SRC})
+
+# Include core headers
+target_include_directories(sdrpp_core PUBLIC "src/")
+target_include_directories(sdrpp_core PUBLIC "src/imgui")
+
+
+if (MSVC)
+    # Lib path
+    target_link_directories(sdrpp_core PUBLIC "C:/Program Files/PothosSDR/lib/")
+
+    # Misc headers
+    target_include_directories(sdrpp_core PUBLIC "C:/Program Files/PothosSDR/include/")
+
+    # Volk
+    target_link_libraries(sdrpp_core PUBLIC volk)
+    
+    # SoapySDR
+    target_link_libraries(sdrpp_core PUBLIC SoapySDR)
+
+    # Glew
+    find_package(GLEW REQUIRED)
+    target_link_libraries(sdrpp_core PUBLIC GLEW::GLEW)
+
+    # GLFW3
+    find_package(glfw3 CONFIG REQUIRED)
+    target_link_libraries(sdrpp_core PUBLIC glfw)
+
+    # FFTW3
+    find_package(FFTW3f CONFIG REQUIRED)
+    target_link_libraries(sdrpp_core PUBLIC FFTW3::fftw3f)
+
+    # PortAudio
+    find_package(portaudio CONFIG REQUIRED)
+    target_link_libraries(sdrpp_core PUBLIC portaudio portaudio_static)
+
+    target_link_libraries(sdrpp_core PUBLIC volk)
+
+else()
+    find_package(PkgConfig)
+    find_package(OpenGL REQUIRED)
+
+    pkg_check_modules(GLEW REQUIRED glew)
+    pkg_check_modules(FFTW3 REQUIRED fftw3f)
+    pkg_check_modules(VOLK REQUIRED volk)
+    pkg_check_modules(GLFW3 REQUIRED glfw3)
+    pkg_check_modules(PORTAUDIO REQUIRED portaudio-2.0)
+
+    target_include_directories(sdrpp_core PUBLIC
+        ${GLEW_INCLUDE_DIRS}
+        ${FFTW3_INCLUDE_DIRS}
+        ${GLFW3_INCLUDE_DIRS}
+        ${VOLK_INCLUDE_DIRS}
+        ${PORTAUDIO_INCLUDE_DIRS}
+        )
+
+    target_link_directories(sdrpp_core PUBLIC
+        ${GLEW_LIBRARY_DIRS}
+        ${FFTW3_LIBRARY_DIRS}
+        ${GLFW3_LIBRARY_DIRS}
+        ${VOLK_LIBRARY_DIRS}
+        ${PORTAUDIO_LIBRARY_DIRS}
+        )
+
+    target_link_libraries(sdrpp_core PUBLIC
+        ${OPENGL_LIBRARIES}
+        ${GLEW_STATIC_LIBRARIES}
+        ${FFTW3_STATIC_LIBRARIES}
+        ${GLFW3_STATIC_LIBRARIES}
+        ${VOLK_STATIC_LIBRARIES}
+        ${PORTAUDIO_STATIC_LIBRARIES}
+        )
+
+    if (${CMAKE_SYSTEM_NAME} MATCHES "Linux")
+        target_link_libraries(sdrpp_core PUBLIC stdc++fs)
+    endif ()
+
+    if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -static")
+        set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -static-libgcc -static-libstdc++")
+    endif ()
+
+endif ()
+
+set(CORE_FILES ${RUNTIME_OUTPUT_DIRECTORY} PARENT_SCOPE)
+
+# cmake .. "-DCMAKE_TOOLCHAIN_FILE=C:/Users/Alex/vcpkg/scripts/buildsystems/vcpkg.cmake" -G "Visual Studio 15 2017 Win64"

core/src/config.cpp

@@ -0,0 +1,118 @@
+#include <config.h>
+#include <spdlog/spdlog.h>
+#include <fstream>
+#include <filesystem>
+
+ConfigManager::ConfigManager() {
+
+}
+
+ConfigManager::~ConfigManager() {
+    disableAutoSave();
+}
+
+void ConfigManager::setPath(std::string file) {
+    path = file;
+}
+
+void ConfigManager::load(json def, bool lock) {
+    if (lock) { mtx.lock(); }
+    if (path == "") {
+        spdlog::error("Config manager tried to load file with no path specified");
+        return;
+    }
+    if (!std::filesystem::exists(path)) {
+        spdlog::warn("Config file '{0}' does not exist, creating it", path);
+        conf = def;
+        save(false);
+    }
+    if (!std::filesystem::is_regular_file(path)) {
+        spdlog::error("Config file '{0}' isn't a file", path);
+        return;
+    }
+    
+    std::ifstream file(path.c_str());
+    file >> conf;
+    file.close();
+    if (lock) { mtx.unlock(); }
+}
+
+void ConfigManager::save(bool lock) {
+    if (lock) { mtx.lock(); }
+    std::ofstream file(path.c_str());
+    file << conf.dump(4);
+    file.close();
+    if (lock) { mtx.unlock(); }
+}
+
+void ConfigManager::enableAutoSave() {
+    if (!autoSaveEnabled) {
+        autoSaveEnabled = true;
+        autoSaveThread = std::thread(autoSaveWorker, this);
+    }
+}
+
+void ConfigManager::disableAutoSave() {
+    if (autoSaveEnabled) {
+        autoSaveEnabled = false;
+        autoSaveThread.join();
+    }
+}
+
+void ConfigManager::aquire() {
+    mtx.lock();
+}
+
+void ConfigManager::release(bool changed) {
+    this->changed |= changed;
+    mtx.unlock();
+}
+
+void ConfigManager::autoSaveWorker(ConfigManager* _this) {
+    while (_this->autoSaveEnabled) {
+        if (!_this->mtx.try_lock()) {
+            spdlog::warn("ConfigManager locked, waiting...");
+            std::this_thread::sleep_for(std::chrono::milliseconds(1000));
+            continue;
+        }
+        if (_this->changed) {
+            _this->changed = false;
+            _this->save(false);
+        }
+        _this->mtx.unlock();
+        std::this_thread::sleep_for(std::chrono::milliseconds(1000));
+    }
+}
+
+// void ConfigManager::setResourceDir(std::string path) {
+//     if (!std::filesystem::exists(path)) {
+//         spdlog::error("Resource directory '{0}' does not exist", path);
+//         return;
+//     }
+//     if (!std::filesystem::is_regular_file(path)) {
+//         spdlog::error("Resource directory '{0}' is not a directory", path);
+//         return;
+//     }
+//     resDir = path;
+// }
+
+// std::string ConfigManager::getResourceDir() {
+//     return resDir;
+// }
+
+// void ConfigManager::setConfigDir(std::string path) {
+//     if (!std::filesystem::exists(path)) {
+//         spdlog::error("Resource directory '{0}' does not exist", path);
+//         return;
+//     }
+//     if (!std::filesystem::is_regular_file(path)) {
+//         spdlog::error("Resource directory '{0}' is not a directory", path);
+//         return;
+//     }
+//     resDir = path;
+// }
+
+// std::string ConfigManager::getConfigDir() {
+//     return configDir;
+// }
+

core/src/config.h

@@ -0,0 +1,55 @@
+#pragma once
+#include <json.hpp>
+#include <thread>
+#include <string>
+#include <mutex>
+
+using nlohmann::json;
+
+#define DEV_BUILD
+
+#define SDRPP_RESOURCE_DIR      "/usr/local/"
+
+#ifndef ROOT_DIR
+#ifdef DEV_BUILD
+#define ROOT_DIR    "../root_dev"
+#elif _WIN32
+#define ROOT_DIR    "."
+#else
+#define ROOT_DIR    "/etc/sdrpp"
+#endif
+#endif
+
+class ConfigManager {
+public:
+    ConfigManager();
+    ~ConfigManager();
+    void setPath(std::string file);
+    void load(json def, bool lock = true);
+    void save(bool lock = true);
+    void enableAutoSave();
+    void disableAutoSave();
+    void aquire();
+    void release(bool changed = false);
+
+    // static void setResourceDir(std::string path);
+    // static std::string getResourceDir();
+
+    // static void setConfigDir(std::string path);
+    // static std::string getConfigDir();
+
+    json conf;
+    
+private:
+    static void autoSaveWorker(ConfigManager* _this);
+
+    //static std::string resDir;
+    //static std::string configDir;
+
+    std::string path = "";
+    bool changed = false;
+    bool autoSaveEnabled = false;
+    std::thread autoSaveThread;
+    std::mutex mtx;
+
+};

core/src/core.cpp

@@ -0,0 +1,295 @@
+#include "imgui.h"
+#include "imgui_impl_glfw.h"
+#include "imgui_impl_opengl3.h"
+#include <stdio.h>
+#include <GL/glew.h>
+#include <GLFW/glfw3.h>
+#include <gui/main_window.h>
+#include <gui/style.h>
+#include <gui/gui.h>
+#include <gui/icons.h>
+#include <version.h>
+#include <spdlog/spdlog.h>
+#include <gui/widgets/bandplan.h>
+#include <stb_image.h>
+#include <config.h>
+#include <core.h>
+#include <duktape/duktape.h>
+#include <duktape/duk_console.h>
+
+#define STB_IMAGE_RESIZE_IMPLEMENTATION
+#include <stb_image_resize.h>
+#include <gui/gui.h>
+#include <signal_path/signal_path.h>
+
+#ifdef _WIN32
+#include <Windows.h>
+#endif
+
+namespace core {
+    ConfigManager configManager;
+    ScriptManager scriptManager;
+    ModuleManager moduleManager;
+
+    void setInputSampleRate(double samplerate) {
+        // NOTE: Zoom controls won't work
+        gui::waterfall.setBandwidth(samplerate);
+        sigpath::signalPath.setSampleRate(samplerate);
+    }
+};
+
+bool maximized = false;
+bool fullScreen = false;
+
+static void glfw_error_callback(int error, const char* description) {
+    spdlog::error("Glfw Error {0}: {1}", error, description);
+}
+
+static void maximized_callback(GLFWwindow* window, int n) {
+    if (n == GLFW_TRUE) {
+        maximized = true;
+    }
+    else {
+        maximized = false;
+    }
+}
+
+duk_ret_t test_func(duk_context *ctx) {
+    printf("Hello from C++\n");
+    return 1;
+}
+
+// main
+int sdrpp_main() {
+#ifdef _WIN32
+    //FreeConsole();
+    // ConfigManager::setResourceDir("./res");
+    // ConfigManager::setConfigDir(".");
+#endif
+
+
+    spdlog::info("SDR++ v" VERSION_STR);
+
+    // ======== DEFAULT CONFIG ========
+    json defConfig;
+    defConfig["bandColors"]["amateur"] = "#FF0000FF";
+    defConfig["bandColors"]["aviation"] = "#00FF00FF";
+    defConfig["bandColors"]["broadcast"] = "#0000FFFF";
+    defConfig["bandColors"]["marine"] = "#00FFFFFF";
+    defConfig["bandColors"]["military"] = "#FFFF00FF";
+    defConfig["bandPlan"] = "General";
+    defConfig["bandPlanEnabled"] = true;
+    defConfig["centerTuning"] = false;
+    defConfig["fftHeight"] = 300;
+    defConfig["frequency"] = 100000000.0;
+    defConfig["max"] = 0.0;
+    defConfig["maximized"] = false;
+    defConfig["menuOrder"] = {
+        "Source",
+        "Radio",
+        "Recorder",
+        "Sinks",
+        "Audio",
+        "Scripting",
+        "Band Plan",
+        "Display"
+    };
+    defConfig["menuWidth"] = 300;
+    defConfig["min"] = -70.0;
+    defConfig["moduleInstances"]["Audio Sink"] = "audio_sink";
+    defConfig["moduleInstances"]["PlutoSDR Source"] = "plutosdr_source";
+    defConfig["moduleInstances"]["RTL-TCP Source"] = "rtl_tcp_source";
+    defConfig["moduleInstances"]["Radio"] = "radio";
+    defConfig["moduleInstances"]["Recorder"] = "recorder";
+    defConfig["moduleInstances"]["SoapySDR Source"] = "soapy_source";
+    defConfig["modules"] = json::array();
+    defConfig["offset"] = 0.0;
+    defConfig["showWaterfall"] = true;
+    defConfig["source"] = "";
+    defConfig["streams"] = json::object();
+    defConfig["windowSize"]["h"] = 720;
+    defConfig["windowSize"]["w"] = 1280;
+
+    // Load config
+    spdlog::info("Loading config");
+    core::configManager.setPath(ROOT_DIR "/config.json");
+    core::configManager.load(defConfig);
+    core::configManager.enableAutoSave();
+
+    // Setup window
+    glfwSetErrorCallback(glfw_error_callback);
+    if (!glfwInit()) {
+        return 1;
+    }
+
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
+    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);  // 3.2+ only
+    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);            // Required on Mac
+    
+    core::configManager.aquire();
+    int winWidth = core::configManager.conf["windowSize"]["w"];
+    int winHeight = core::configManager.conf["windowSize"]["h"];
+    maximized = core::configManager.conf["maximized"];
+    core::configManager.release();
+
+    // Create window with graphics context
+    GLFWmonitor* monitor = glfwGetPrimaryMonitor();
+    GLFWwindow* window = glfwCreateWindow(winWidth, winHeight, "SDR++ v" VERSION_STR " (Built at " __TIME__ ", " __DATE__ ")", NULL, NULL);
+    if (window == NULL)
+        return 1;
+    glfwMakeContextCurrent(window);
+
+#if (GLFW_VERSION_MAJOR == 3) && (GLFW_VERSION_MINOR >= 3)
+    if (maximized) {
+        glfwMaximizeWindow(window);
+    }
+
+    glfwSetWindowMaximizeCallback(window, maximized_callback);
+#endif
+
+    // Load app icon
+    GLFWimage icons[10];
+    icons[0].pixels = stbi_load(((std::string)(ROOT_DIR "/res/icons/sdrpp.png")).c_str(), &icons[0].width, &icons[0].height, 0, 4);
+    icons[1].pixels = (unsigned char*)malloc(16 * 16 * 4); icons[1].width = icons[1].height = 16;
+    icons[2].pixels = (unsigned char*)malloc(24 * 24 * 4); icons[2].width = icons[2].height = 24;
+    icons[3].pixels = (unsigned char*)malloc(32 * 32 * 4); icons[3].width = icons[3].height = 32;
+    icons[4].pixels = (unsigned char*)malloc(48 * 48 * 4); icons[4].width = icons[4].height = 48;
+    icons[5].pixels = (unsigned char*)malloc(64 * 64 * 4); icons[5].width = icons[5].height = 64;
+    icons[6].pixels = (unsigned char*)malloc(96 * 96 * 4); icons[6].width = icons[6].height = 96;
+    icons[7].pixels = (unsigned char*)malloc(128 * 128 * 4); icons[7].width = icons[7].height = 128;
+    icons[8].pixels = (unsigned char*)malloc(196 * 196 * 4); icons[8].width = icons[8].height = 196;
+    icons[9].pixels = (unsigned char*)malloc(256 * 256 * 4); icons[9].width = icons[9].height = 256;
+    stbir_resize_uint8(icons[0].pixels, icons[0].width, icons[0].height, icons[0].width * 4, icons[1].pixels, 16, 16, 16 * 4, 4);
+    stbir_resize_uint8(icons[0].pixels, icons[0].width, icons[0].height, icons[0].width * 4, icons[2].pixels, 24, 24, 24 * 4, 4);
+    stbir_resize_uint8(icons[0].pixels, icons[0].width, icons[0].height, icons[0].width * 4, icons[3].pixels, 32, 32, 32 * 4, 4);
+    stbir_resize_uint8(icons[0].pixels, icons[0].width, icons[0].height, icons[0].width * 4, icons[4].pixels, 48, 48, 48 * 4, 4);
+    stbir_resize_uint8(icons[0].pixels, icons[0].width, icons[0].height, icons[0].width * 4, icons[5].pixels, 64, 64, 64 * 4, 4);
+    stbir_resize_uint8(icons[0].pixels, icons[0].width, icons[0].height, icons[0].width * 4, icons[6].pixels, 96, 96, 96 * 4, 4);
+    stbir_resize_uint8(icons[0].pixels, icons[0].width, icons[0].height, icons[0].width * 4, icons[7].pixels, 128, 128, 128 * 4, 4);
+    stbir_resize_uint8(icons[0].pixels, icons[0].width, icons[0].height, icons[0].width * 4, icons[8].pixels, 196, 196, 196 * 4, 4);
+    stbir_resize_uint8(icons[0].pixels, icons[0].width, icons[0].height, icons[0].width * 4, icons[9].pixels, 256, 256, 256 * 4, 4);
+    glfwSetWindowIcon(window, 10, icons);
+    stbi_image_free(icons[0].pixels);
+    for (int i = 1; i < 10; i++) {
+        free(icons[i].pixels);
+    }
+
+    if (glewInit() != GLEW_OK) {
+        spdlog::error("Failed to initialize OpenGL loader!");
+        return 1;
+    }
+
+
+    // Setup Dear ImGui context
+    IMGUI_CHECKVERSION();
+    ImGui::CreateContext();
+    ImGuiIO& io = ImGui::GetIO(); (void)io;
+    io.IniFilename = NULL;
+
+    // Setup Platform/Renderer bindings
+    ImGui_ImplGlfw_InitForOpenGL(window, true);
+    ImGui_ImplOpenGL3_Init("#version 150");
+
+    style::setDarkStyle();
+
+    LoadingScreen::setWindow(window);
+
+    LoadingScreen::show("Loading icons");
+    spdlog::info("Loading icons");
+    icons::load();
+
+    LoadingScreen::show("Loading band plans");
+    spdlog::info("Loading band plans");
+    bandplan::loadFromDir(ROOT_DIR "/bandplans");
+
+    LoadingScreen::show("Loading band plan colors");
+    spdlog::info("Loading band plans color table");
+    bandplan::loadColorTable(ROOT_DIR "/band_colors.json");
+
+    windowInit();
+
+    spdlog::info("Ready.");
+
+    bool _maximized = maximized;
+    int fsWidth, fsHeight, fsPosX, fsPosY;
+
+    // Main loop
+    while (!glfwWindowShouldClose(window)) {
+        glfwPollEvents();
+
+        // Start the Dear ImGui frame
+        ImGui_ImplOpenGL3_NewFrame();
+        ImGui_ImplGlfw_NewFrame();
+        ImGui::NewFrame();
+
+        //ImGui::ShowDemoWindow();
+
+        if (_maximized != maximized) {
+            _maximized = maximized;
+            core::configManager.aquire();
+            core::configManager.conf["maximized"]= _maximized;
+            if (!maximized) {
+                glfwSetWindowSize(window, core::configManager.conf["windowSize"]["w"], core::configManager.conf["windowSize"]["h"]);
+            }
+            core::configManager.release(true);
+        }
+
+        int _winWidth, _winHeight;
+        glfwGetWindowSize(window, &_winWidth, &_winHeight);
+
+        if (ImGui::IsKeyPressed(GLFW_KEY_F11)) {
+            fullScreen = !fullScreen;
+            if (fullScreen) {
+                spdlog::info("Fullscreen: ON");
+                fsWidth = _winWidth;
+                fsHeight = _winHeight;
+                glfwGetWindowPos(window, &fsPosX, &fsPosY);
+                const GLFWvidmode * mode = glfwGetVideoMode(glfwGetPrimaryMonitor());
+                glfwSetWindowMonitor(window, monitor, 0, 0, mode->width, mode->height, 0);
+            }
+            else {
+                spdlog::info("Fullscreen: OFF");
+                glfwSetWindowMonitor(window, nullptr,  fsPosX, fsPosY, fsWidth, fsHeight, 0);
+            }
+        }
+
+        if ((_winWidth != winWidth || _winHeight != winHeight) && !maximized && _winWidth > 0 && _winHeight > 0) {
+            winWidth = _winWidth;
+            winHeight = _winHeight;
+            core::configManager.aquire();
+            core::configManager.conf["windowSize"]["w"] = winWidth;
+            core::configManager.conf["windowSize"]["h"] = winHeight;
+            core::configManager.release(true);
+        }
+
+        if (winWidth > 0 && winHeight > 0) {
+            ImGui::SetNextWindowPos(ImVec2(0, 0));
+            ImGui::SetNextWindowSize(ImVec2(_winWidth, _winHeight));
+            drawWindow();
+        }
+
+        // Rendering
+        ImGui::Render();
+        int display_w, display_h;
+        glfwGetFramebufferSize(window, &display_w, &display_h);
+        glViewport(0, 0, display_w, display_h);
+        glClearColor(0.0666f, 0.0666f, 0.0666f, 1.0f);
+        //glClearColor(0.9f, 0.9f, 0.9f, 1.0f);
+        glClear(GL_COLOR_BUFFER_BIT);
+        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+
+        glfwSwapInterval(1); // Enable vsync
+        glfwSwapBuffers(window);
+    }
+
+    // Cleanup
+    ImGui_ImplOpenGL3_Shutdown();
+    ImGui_ImplGlfw_Shutdown();
+    ImGui::DestroyContext();
+
+    glfwDestroyWindow(window);
+    glfwTerminate();
+
+    return 0;
+}

core/src/core.h

@@ -0,0 +1,15 @@
+#pragma once
+#include <config.h>
+#include <new_module.h>
+#include <scripting.h>
+#include <new_module.h>
+
+namespace core {
+    SDRPP_EXPORT ConfigManager configManager;
+    SDRPP_EXPORT ScriptManager scriptManager;
+    SDRPP_EXPORT ModuleManager moduleManager;
+
+    void setInputSampleRate(double samplerate);
+};
+
+int sdrpp_main();

core/src/dsp/audio.h

@@ -0,0 +1,95 @@
+#pragma once
+#include <dsp/block.h>
+
+namespace dsp {
+    class MonoToStereo : public generic_block<MonoToStereo> {
+    public:
+        MonoToStereo() {}
+
+        MonoToStereo(stream<float>* in) { init(in); }
+
+        ~MonoToStereo() { generic_block<MonoToStereo>::stop(); }
+
+        void init(stream<float>* in) {
+            _in = in;
+            generic_block<MonoToStereo>::registerInput(_in);
+            generic_block<MonoToStereo>::registerOutput(&out);
+        }
+
+        void setInput(stream<float>* in) {
+            std::lock_guard<std::mutex> lck(generic_block<MonoToStereo>::ctrlMtx);
+            generic_block<MonoToStereo>::tempStop();
+            generic_block<MonoToStereo>::unregisterInput(_in);
+            _in = in;
+            generic_block<MonoToStereo>::registerInput(_in);
+            generic_block<MonoToStereo>::tempStart();
+        }
+
+        int run() {
+            count = _in->read();
+            if (count < 0) { return -1; }
+
+            if (out.aquire() < 0) { return -1; }
+            for (int i = 0; i < count; i++) {
+                out.data[i].l = _in->data[i];
+                out.data[i].r = _in->data[i];
+            }
+
+            _in->flush();
+            out.write(count);
+            return count;
+        }
+
+        stream<stereo_t> out;
+
+    private:
+        int count;
+        stream<float>* _in;
+
+    };
+
+    class StereoToMono : public generic_block<StereoToMono> {
+    public:
+        StereoToMono() {}
+
+        StereoToMono(stream<stereo_t>* in) { init(in); }
+
+        ~StereoToMono() { generic_block<StereoToMono>::stop(); }
+
+        void init(stream<stereo_t>* in) {
+            _in = in;
+            generic_block<StereoToMono>::registerInput(_in);
+            generic_block<StereoToMono>::registerOutput(&out);
+        }
+
+        void setInput(stream<stereo_t>* in) {
+            std::lock_guard<std::mutex> lck(generic_block<StereoToMono>::ctrlMtx);
+            generic_block<StereoToMono>::tempStop();
+            generic_block<StereoToMono>::unregisterInput(_in);
+            _in = in;
+            generic_block<StereoToMono>::registerInput(_in);
+            generic_block<StereoToMono>::tempStart();
+        }
+
+        int run() {
+            count = _in->read();
+            if (count < 0) { return -1; }
+
+            if (out.aquire() < 0) { return -1; }
+            for (int i = 0; i < count; i++) {
+                out.data[i] = (_in->data[i].l + _in->data[i].r) / 2.0f;
+            }
+
+            _in->flush();
+            out.write(count);
+            return count;
+        }
+
+        stream<float> out;
+
+    private:
+        int count;
+        stream<stereo_t>* _in;
+
+    };
+}

core/src/dsp/block.h

@@ -0,0 +1,126 @@
+#pragma once
+#include <stdio.h>
+#include <dsp/stream.h>
+#include <dsp/types.h>
+#include <thread>
+#include <vector>
+#include <algorithm>
+
+#define FL_M_PI                3.1415926535f
+
+namespace dsp {
+    
+    template <class BLOCK>
+    class generic_block {
+    public:
+        virtual void init() {}
+
+        virtual ~generic_block() {
+            stop();
+        }
+
+        virtual void start() {
+            std::lock_guard<std::mutex> lck(ctrlMtx);
+            if (running) {
+                return;
+            }
+            running = true;
+            doStart();
+        }
+
+        virtual void stop() {
+            std::lock_guard<std::mutex> lck(ctrlMtx);
+            if (!running) {
+                return;
+            }
+            doStop();
+            running = false;
+        }
+
+        virtual int calcOutSize(int inSize) { return inSize; }
+
+        virtual int run() = 0;
+        
+        friend BLOCK;
+
+    private:
+        void workerLoop() { 
+            while (run() >= 0);
+        }
+
+        void aquire() {
+            ctrlMtx.lock();
+        }
+
+        void release() {
+            ctrlMtx.unlock();
+        }
+
+        void registerInput(untyped_steam* inStream) {
+            inputs.push_back(inStream);
+        }
+
+        void unregisterInput(untyped_steam* inStream) {
+            inputs.erase(std::remove(inputs.begin(), inputs.end(), inStream), inputs.end());
+        }
+
+        void registerOutput(untyped_steam* outStream) {
+            outputs.push_back(outStream);
+        }
+
+        void unregisterOutput(untyped_steam* outStream) {
+            outputs.erase(std::remove(outputs.begin(), outputs.end(), outStream), outputs.end());
+        }
+
+        virtual void doStart() {
+            workerThread = std::thread(&generic_block<BLOCK>::workerLoop, this);
+        }
+
+        virtual void doStop() {
+            for (auto const& in : inputs) {
+                in->stopReader();
+            }
+            for (auto const& out : outputs) {
+                out->stopWriter();
+            }
+
+            // TODO: Make sure this isn't needed, I don't know why it stops
+            if (workerThread.joinable()) {
+                workerThread.join();
+            }
+            
+            for (auto const& in : inputs) {
+                in->clearReadStop();
+            }
+            for (auto const& out : outputs) {
+                out->clearWriteStop();
+            }
+        }
+
+        void tempStart() {
+            if (tempStopped) {
+                doStart();
+                tempStopped = false;
+            }
+        }
+
+        void tempStop() {
+            if (running && !tempStopped) {
+                doStop();
+                tempStopped = true;
+            }
+        }
+
+        std::vector<untyped_steam*> inputs;
+        std::vector<untyped_steam*> outputs;
+
+        bool running = false;
+        bool tempStopped = false;
+
+        std::thread workerThread;
+
+    protected:
+        std::mutex ctrlMtx;
+
+    };
+}

core/src/dsp/buffer.h

@@ -1,34 +1,22 @@
 #pragma once
-#include <condition_variable>
+#include <dsp/block.h>
-#include <algorithm>
-#include <math.h>
-#include <string.h>
 
-#define STREAM_BUF_SZ   1000000
+#define RING_BUF_SZ 1000000
 
 namespace dsp {
     template <class T>
-    class stream {
+    class RingBuffer {
     public:
-        stream() {
+        RingBuffer() {
 
         }
 
-        stream(int maxLatency) {
+        RingBuffer(int maxLatency) { init(maxLatency); }
-            size = STREAM_BUF_SZ;
+
-            _buffer = new T[size];
+        ~RingBuffer() { delete _buffer; }
-            _stopReader = false;
-            _stopWriter = false;
-            this->maxLatency = maxLatency;
-            writec = 0;
-            readc = 0;
-            readable = 0;
-            writable = size;
-            memset(_buffer, 0, size * sizeof(T));
-        }
 
         void init(int maxLatency) {
-            size = STREAM_BUF_SZ;
+            size = RING_BUF_SZ;
             _buffer = new T[size];
             _stopReader = false;
             _stopWriter = false;

core/src/dsp/convertion.h

@@ -0,0 +1,138 @@
+#pragma once
+#include <dsp/block.h>
+
+namespace dsp {
+    class ComplexToStereo : public generic_block<ComplexToStereo> {
+    public:
+        ComplexToStereo() {}
+
+        ComplexToStereo(stream<complex_t>* in) { init(in); }
+
+        ~ComplexToStereo() { generic_block<ComplexToStereo>::stop(); }
+
+        static_assert(sizeof(complex_t) == sizeof(stereo_t));
+
+        void init(stream<complex_t>* in) {
+            _in = in;
+            generic_block<ComplexToStereo>::registerInput(_in);
+            generic_block<ComplexToStereo>::registerOutput(&out);
+        }
+
+        void setInput(stream<complex_t>* in) {
+            std::lock_guard<std::mutex> lck(generic_block<ComplexToStereo>::ctrlMtx);
+            generic_block<ComplexToStereo>::tempStop();
+            generic_block<ComplexToStereo>::unregisterInput(_in);
+            _in = in;
+            generic_block<ComplexToStereo>::registerInput(_in);
+            generic_block<ComplexToStereo>::tempStart();
+        }
+
+        int run() {
+            count = _in->read();
+            if (count < 0) { return -1; }
+
+            if (out.aquire() < 0) { return -1; } 
+            memcpy(out.data, _in->data, count * sizeof(complex_t));
+
+            _in->flush();
+            out.write(count);
+            return count;
+        }
+
+        stream<stereo_t> out;
+
+    private:
+        float avg;
+        int count;
+        stream<complex_t>* _in;
+
+    };
+
+    class ComplexToReal : public generic_block<ComplexToReal> {
+    public:
+        ComplexToReal() {}
+
+        ComplexToReal(stream<complex_t>* in) { init(in); }
+
+        ~ComplexToReal() { generic_block<ComplexToReal>::stop(); }
+
+        void init(stream<complex_t>* in) {
+            _in = in;
+            generic_block<ComplexToReal>::registerInput(_in);
+            generic_block<ComplexToReal>::registerOutput(&out);
+        }
+
+        void setInput(stream<complex_t>* in) {
+            std::lock_guard<std::mutex> lck(generic_block<ComplexToReal>::ctrlMtx);
+            generic_block<ComplexToReal>::tempStop();
+            generic_block<ComplexToReal>::unregisterInput(_in);
+            _in = in;
+            generic_block<ComplexToReal>::registerInput(_in);
+            generic_block<ComplexToReal>::tempStart();
+        }
+
+        int run() {
+            count = _in->read();
+            if (count < 0) { return -1; }
+
+            if (out.aquire() < 0) { return -1; } 
+            volk_32fc_deinterleave_real_32f(out.data, (lv_32fc_t*)_in->data, count);
+
+            _in->flush();
+            out.write(count);
+            return count;
+        }
+
+        stream<float> out;
+
+    private:
+        float avg;
+        int count;
+        stream<complex_t>* _in;
+
+    };
+
+    class ComplexToImag : public generic_block<ComplexToImag> {
+    public:
+        ComplexToImag() {}
+
+        ComplexToImag(stream<complex_t>* in) { init(in); }
+
+        ~ComplexToImag() { generic_block<ComplexToImag>::stop(); }
+
+        void init(stream<complex_t>* in) {
+            _in = in;
+            generic_block<ComplexToImag>::registerInput(_in);
+            generic_block<ComplexToImag>::registerOutput(&out);
+        }
+
+        void setInput(stream<complex_t>* in) {
+            std::lock_guard<std::mutex> lck(generic_block<ComplexToImag>::ctrlMtx);
+            generic_block<ComplexToImag>::tempStop();
+            generic_block<ComplexToImag>::unregisterInput(_in);
+            _in = in;
+            generic_block<ComplexToImag>::registerInput(_in);
+            generic_block<ComplexToImag>::tempStart();
+        }
+
+        int run() {
+            count = _in->read();
+            if (count < 0) { return -1; }
+
+            if (out.aquire() < 0) { return -1; } 
+            volk_32fc_deinterleave_imag_32f(out.data, (lv_32fc_t*)_in->data, count);
+
+            _in->flush();
+            out.write(count);
+            return count;
+        }
+
+        stream<float> out;
+
+    private:
+        float avg;
+        int count;
+        stream<complex_t>* _in;
+
+    };
+}

core/src/dsp/demodulator.h

@@ -0,0 +1,283 @@
+#pragma once
+#include <dsp/block.h>
+#include <volk/volk.h>
+
+#include <spdlog/spdlog.h>
+
+#define FAST_ATAN2_COEF1    FL_M_PI / 4.0f
+#define FAST_ATAN2_COEF2    3.0f * FAST_ATAN2_COEF1
+
+inline float fast_arctan2(float y, float x) {
+    float abs_y = fabsf(y);
+    float r, angle;
+    if (x == 0.0f && y == 0.0f) { return 0.0f; }
+    if (x>=0.0f) {
+        r = (x - abs_y) / (x + abs_y);
+        angle = FAST_ATAN2_COEF1 - FAST_ATAN2_COEF1 * r;
+    }
+    else {
+        r = (x + abs_y) / (abs_y - x);
+        angle = FAST_ATAN2_COEF2 - FAST_ATAN2_COEF1 * r;
+    }
+    if (y < 0.0f) {
+        return -angle;
+    }
+   return angle;
+}
+
+namespace dsp {
+    class FMDemod : public generic_block<FMDemod> {
+    public:
+        FMDemod() {}
+
+        FMDemod(stream<complex_t>* in, float sampleRate, float deviation) { init(in, sampleRate, deviation); }
+
+        ~FMDemod() { generic_block<FMDemod>::stop(); }
+
+        void init(stream<complex_t>* in, float sampleRate, float deviation) {
+            _in = in;
+            _sampleRate = sampleRate;
+            _deviation = deviation;
+            phasorSpeed = (2 * FL_M_PI) / (_sampleRate / _deviation);
+            generic_block<FMDemod>::registerInput(_in);
+            generic_block<FMDemod>::registerOutput(&out);
+        }
+
+        void setInput(stream<complex_t>* in) {
+            std::lock_guard<std::mutex> lck(generic_block<FMDemod>::ctrlMtx);
+            generic_block<FMDemod>::tempStop();
+            generic_block<FMDemod>::unregisterInput(_in);
+            _in = in;
+            generic_block<FMDemod>::registerInput(_in);
+            generic_block<FMDemod>::tempStart();
+        }
+
+        void setSampleRate(float sampleRate) {
+            std::lock_guard<std::mutex> lck(generic_block<FMDemod>::ctrlMtx);
+            generic_block<FMDemod>::tempStop();
+            _sampleRate = sampleRate;
+            phasorSpeed = (2 * FL_M_PI) / (_sampleRate / _deviation);
+            generic_block<FMDemod>::tempStart();
+        }
+
+        float getSampleRate() {
+            return _sampleRate;
+        }
+
+        void setDeviation(float deviation) {
+            std::lock_guard<std::mutex> lck(generic_block<FMDemod>::ctrlMtx);
+            generic_block<FMDemod>::tempStop();
+            _deviation = deviation;
+            phasorSpeed = (2 * FL_M_PI) / (_sampleRate / _deviation);
+            generic_block<FMDemod>::tempStart();
+        }
+
+        float getDeviation() {
+            return _deviation;
+        }
+
+        int run() {
+            count = _in->read();
+            if (count < 0) { return -1; }
+
+            // This is somehow faster than volk...
+
+            float diff, currentPhase;
+
+            if (out.aquire() < 0) { return -1; } 
+            for (int i = 0; i < count; i++) {
+                currentPhase = fast_arctan2(_in->data[i].i, _in->data[i].q);
+                diff = currentPhase - phase;
+                if (diff > 3.1415926535f)        { diff -= 2 * 3.1415926535f; }
+                else if (diff <= -3.1415926535f) { diff += 2 * 3.1415926535f; }
+                out.data[i] = diff / phasorSpeed;
+                phase = currentPhase;
+            }
+
+            _in->flush();
+            out.write(count);
+            return count;
+        }
+
+        stream<float> out;
+
+    private:
+        int count;
+        float phase, phasorSpeed, _sampleRate, _deviation;
+        stream<complex_t>* _in;
+
+    };
+
+    class AMDemod : public generic_block<AMDemod> {
+    public:
+        AMDemod() {}
+
+        AMDemod(stream<complex_t>* in) { init(in); }
+
+        ~AMDemod() { generic_block<AMDemod>::stop(); }
+
+        void init(stream<complex_t>* in) {
+            _in = in;
+            generic_block<AMDemod>::registerInput(_in);
+            generic_block<AMDemod>::registerOutput(&out);
+        }
+
+        void setInput(stream<complex_t>* in) {
+            std::lock_guard<std::mutex> lck(generic_block<AMDemod>::ctrlMtx);
+            generic_block<AMDemod>::tempStop();
+            generic_block<AMDemod>::unregisterInput(_in);
+            _in = in;
+            generic_block<AMDemod>::registerInput(_in);
+            generic_block<AMDemod>::tempStart();
+        }
+
+        int run() {
+            count = _in->read();
+            if (count < 0) { return -1; }
+
+            if (out.aquire() < 0) { return -1; } 
+            volk_32fc_magnitude_32f(out.data, (lv_32fc_t*)_in->data, count);
+
+            _in->flush();
+
+            volk_32f_accumulator_s32f(&avg, out.data, count);
+            avg /= (float)count;
+
+            for (int i = 0; i < count; i++) {
+                out.data[i] -= avg;
+            }
+
+            out.write(count);
+            return count;
+        }
+
+        stream<float> out;
+
+    private:
+        float avg;
+        int count;
+        stream<complex_t>* _in;
+
+    };
+
+    class SSBDemod : public generic_block<SSBDemod> {
+    public:
+        SSBDemod() {}
+
+        SSBDemod(stream<complex_t>* in, float sampleRate, float bandWidth, int mode) { init(in, sampleRate, bandWidth, mode); }
+
+        ~SSBDemod() {
+            generic_block<SSBDemod>::stop();
+            delete[] buffer;
+        }
+
+        enum {
+            MODE_USB,
+            MODE_LSB,
+            MODE_DSB
+        };
+
+        void init(stream<complex_t>* in, float sampleRate, float bandWidth, int mode) {
+            _in = in;
+            _sampleRate = sampleRate;
+            _bandWidth = bandWidth;
+            _mode = mode;
+            phase = lv_cmake(1.0f, 0.0f);
+            switch (_mode) {
+            case MODE_USB:
+                phaseDelta = lv_cmake(std::cos((_bandWidth / _sampleRate) * FL_M_PI), std::sin((_bandWidth / _sampleRate) * FL_M_PI));
+                break;
+            case MODE_LSB:
+                phaseDelta = lv_cmake(std::cos(-(_bandWidth / _sampleRate) * FL_M_PI), std::sin(-(_bandWidth / _sampleRate) * FL_M_PI));
+                break;
+            case MODE_DSB:
+                phaseDelta = lv_cmake(1.0f, 0.0f);
+                break;
+            }
+            buffer = new lv_32fc_t[STREAM_BUFFER_SIZE];
+            generic_block<SSBDemod>::registerInput(_in);
+            generic_block<SSBDemod>::registerOutput(&out);
+        }
+
+        void setInput(stream<complex_t>* in) {
+            std::lock_guard<std::mutex> lck(generic_block<SSBDemod>::ctrlMtx);
+            generic_block<SSBDemod>::tempStop();
+            generic_block<SSBDemod>::unregisterInput(_in);
+            _in = in;
+            generic_block<SSBDemod>::registerInput(_in);
+            generic_block<SSBDemod>::tempStart();
+        }
+
+        void setSampleRate(float sampleRate) {
+            // No need to restart
+            _sampleRate = sampleRate;
+            switch (_mode) {
+            case MODE_USB:
+                phaseDelta = lv_cmake(std::cos((_bandWidth / _sampleRate) * FL_M_PI), std::sin((_bandWidth / _sampleRate) * FL_M_PI));
+                break;
+            case MODE_LSB:
+                phaseDelta = lv_cmake(std::cos(-(_bandWidth / _sampleRate) * FL_M_PI), std::sin(-(_bandWidth / _sampleRate) * FL_M_PI));
+                break;
+            case MODE_DSB:
+                phaseDelta = lv_cmake(1.0f, 0.0f);
+                break;
+            }
+        }
+
+        void setBandWidth(float bandWidth) {
+            // No need to restart
+            _bandWidth = bandWidth;
+            switch (_mode) {
+            case MODE_USB:
+                phaseDelta = lv_cmake(std::cos((_bandWidth / _sampleRate) * FL_M_PI), std::sin((_bandWidth / _sampleRate) * FL_M_PI));
+                break;
+            case MODE_LSB:
+                phaseDelta = lv_cmake(std::cos(-(_bandWidth / _sampleRate) * FL_M_PI), std::sin(-(_bandWidth / _sampleRate) * FL_M_PI));
+                break;
+            case MODE_DSB:
+                phaseDelta = lv_cmake(1.0f, 0.0f);
+                break;
+            }
+        }
+
+        void setMode(int mode) {
+            _mode = mode;
+            switch (_mode) {
+            case MODE_USB:
+                phaseDelta = lv_cmake(std::cos((_bandWidth / _sampleRate) * FL_M_PI), std::sin((_bandWidth / _sampleRate) * FL_M_PI));
+                break;
+            case MODE_LSB:
+                phaseDelta = lv_cmake(std::cos(-(_bandWidth / _sampleRate) * FL_M_PI), std::sin(-(_bandWidth / _sampleRate) * FL_M_PI));
+                break;
+            case MODE_DSB:
+                phaseDelta = lv_cmake(1.0f, 0.0f);
+                break;
+            }
+        }
+
+        int run() {
+            count = _in->read();
+            if (count < 0) { return -1; }
+
+            if (out.aquire() < 0) { return -1; } 
+            volk_32fc_s32fc_x2_rotator_32fc(buffer, (lv_32fc_t*)_in->data, phaseDelta, &phase, count);
+            volk_32fc_deinterleave_real_32f(out.data, buffer, count);
+
+            _in->flush();
+            out.write(count);
+            return count;
+        }
+
+        stream<float> out;
+
+    private:
+        int count;
+        int _mode;
+        float _sampleRate, _bandWidth;
+        stream<complex_t>* _in;
+        lv_32fc_t* buffer;
+        lv_32fc_t phase;
+        lv_32fc_t phaseDelta;
+
+    };
+}

core/src/dsp/filter.h

@@ -0,0 +1,173 @@
+#pragma once
+#include <dsp/block.h>
+#include <dsp/window.h>
+#include <string.h>
+
+namespace dsp {
+
+    template <class T>
+    class FIR : public generic_block<FIR<T>> {
+    public:
+        FIR() {}
+
+        FIR(stream<T>* in, dsp::filter_window::generic_window* window) { init(in, window); }
+
+        ~FIR() {
+            generic_block<FIR<T>>::stop();
+            volk_free(buffer);
+            volk_free(taps);
+        }
+
+        void init(stream<T>* in, dsp::filter_window::generic_window* window) {
+            _in = in;
+
+            tapCount = window->getTapCount();
+            taps = (float*)volk_malloc(tapCount * sizeof(float), volk_get_alignment());
+            window->createTaps(taps, tapCount);
+
+            buffer = (T*)volk_malloc(STREAM_BUFFER_SIZE * sizeof(T) * 2, volk_get_alignment());
+            bufStart = &buffer[tapCount];
+            generic_block<FIR<T>>::registerInput(_in);
+            generic_block<FIR<T>>::registerOutput(&out);
+        }
+
+        void setInput(stream<T>* in) {
+            std::lock_guard<std::mutex> lck(generic_block<FIR<T>>::ctrlMtx);
+            generic_block<FIR<T>>::tempStop();
+            generic_block<FIR<T>>::unregisterInput(_in);
+            _in = in;
+            generic_block<FIR<T>>::registerInput(_in);
+            generic_block<FIR<T>>::tempStart();
+        }
+
+        void updateWindow(dsp::filter_window::generic_window* window) {
+            _window = window;
+            volk_free(taps);
+            tapCount = window->getTapCount();
+            taps = (float*)volk_malloc(tapCount * sizeof(float), volk_get_alignment());
+            window->createTaps(taps, tapCount);
+        }
+
+        int run() {
+            count = _in->read();
+            if (count < 0) { return -1; }
+
+            memcpy(bufStart, _in->data, count * sizeof(T));
+            _in->flush();
+
+            // Write to output
+            if (out.aquire() < 0) { return -1; } 
+
+            if constexpr (std::is_same_v<T, float>) {
+                for (int i = 0; i < count; i++) {
+                    volk_32f_x2_dot_prod_32f((float*)&out.data[i], (float*)&buffer[i+1], taps, tapCount);
+                }
+            }
+            if constexpr (std::is_same_v<T, complex_t>) {
+                for (int i = 0; i < count; i++) {
+                    volk_32fc_32f_dot_prod_32fc((lv_32fc_t*)&out.data[i], (lv_32fc_t*)&buffer[i+1], taps, tapCount);
+                }
+            }
+
+            out.write(count);
+
+            memmove(buffer, &buffer[count], tapCount * sizeof(T));
+
+            return count;
+        }
+
+        stream<T> out;
+
+    private:
+        int count;
+        stream<T>* _in;
+
+        dsp::filter_window::generic_window* _window;
+
+        T* bufStart;
+        T* buffer;
+        int tapCount;
+        float* taps;
+
+    };
+
+    class BFMDeemp : public generic_block<BFMDeemp> {
+    public:
+        BFMDeemp() {}
+
+        BFMDeemp(stream<float>* in, float sampleRate, float tau) { init(in, sampleRate, tau); }
+
+        ~BFMDeemp() { generic_block<BFMDeemp>::stop(); }
+
+        void init(stream<float>* in, float sampleRate, float tau) {
+            _in = in;
+            _sampleRate = sampleRate;
+            _tau = tau;
+            float dt = 1.0f / _sampleRate;
+            alpha = dt / (_tau + dt);
+            generic_block<BFMDeemp>::registerInput(_in);
+            generic_block<BFMDeemp>::registerOutput(&out);
+        }
+
+        void setInput(stream<float>* in) {
+            std::lock_guard<std::mutex> lck(generic_block<BFMDeemp>::ctrlMtx);
+            generic_block<BFMDeemp>::tempStop();
+            generic_block<BFMDeemp>::unregisterInput(_in);
+            _in = in;
+            generic_block<BFMDeemp>::registerInput(_in);
+            generic_block<BFMDeemp>::tempStart();
+        }
+
+        void setSampleRate(float sampleRate) {
+            _sampleRate = sampleRate;
+            float dt = 1.0f / _sampleRate;
+            alpha = dt / (_tau + dt);
+        }
+
+        void setTau(float tau) {
+            _tau = tau;
+            float dt = 1.0f / _sampleRate;
+            alpha = dt / (_tau + dt);
+        }
+
+        int run() {
+            count = _in->read();
+            if (count < 0) { return -1; }
+
+            if (bypass) {
+                if (out.aquire() < 0) { return -1; }
+                memcpy(out.data, _in->data, count * sizeof(float));
+                _in->flush();
+                out.write(count);
+                return count;
+            }
+
+            if (isnan(lastOut)) {
+                lastOut = 0.0f;
+            }
+            if (out.aquire() < 0) { return -1; } 
+            out.data[0] = (alpha * _in->data[0]) + ((1-alpha) * lastOut);
+            for (int i = 1; i < count; i++) {
+                out.data[i] = (alpha * _in->data[i]) + ((1 - alpha) * out.data[i - 1]);
+            }
+            lastOut = out.data[count - 1];
+
+            _in->flush();
+            out.write(count);
+            return count;
+        }
+
+        bool bypass = false;
+
+        stream<float> out;
+
+    private:
+        int count;
+        float lastOut = 0.0f;
+        float alpha;
+        float _tau;
+        float _sampleRate;
+        stream<float>* _in;
+
+    };
+}

core/src/dsp/math.h

@@ -0,0 +1,107 @@
+#pragma once
+#include <dsp/block.h>
+#include <volk/volk.h>
+
+namespace dsp {
+    template <class T>
+    class Add : public generic_block<Add<T>> {
+    public:
+        Add() {}
+
+        Add(stream<T>* a, stream<T>* b) { init(a, b); }
+
+        ~Add() { generic_block<Add>::stop(); }
+
+        void init(stream<T>* a, stream<T>* b) {
+            _a = a;
+            _b = b;
+            generic_block<Add>::registerInput(a);
+            generic_block<Add>::registerInput(b);
+            generic_block<Add>::registerOutput(&out);
+        }
+
+        int run() {
+            a_count = _a->read();
+            if (a_count < 0) { return -1; }
+            b_count = _b->read();
+            if (b_count < 0) { return -1; }
+            if (a_count != b_count) {
+                _a->flush();
+                _b->flush();
+                return 0;
+            }
+
+            if (out.aquire() < 0) { return -1; }
+            if constexpr (std::is_same_v<T, complex_t> || std::is_same_v<T, stereo_t>) {
+                volk_32fc_x2_add_32fc(out.data, _a->data, _b->data, a_count);
+            }
+            else {
+                volk_32f_x2_add_32f(out.data, _a->data, _b->data, a_count);
+            }
+
+            _a->flush();
+            _b->flush();
+            out.write(a_count);
+            return a_count;
+        }
+
+        stream<T> out;
+
+    private:
+        int a_count, b_count;
+        stream<T>* _a;
+        stream<T>* _b;
+
+    };
+
+    template <class T>
+    class Multiply : public generic_block<Multiply<T>> {
+    public:
+        Multiply() {}
+
+        Multiply(stream<T>* a, stream<T>* b) { init(a, b); }
+
+        ~Multiply() { generic_block<Multiply>::stop(); }
+
+        void init(stream<T>* a, stream<T>* b) {
+            _a = a;
+            _b = b;
+            generic_block<Multiply>::registerInput(a);
+            generic_block<Multiply>::registerInput(b);
+            generic_block<Multiply>::registerOutput(&out);
+        }
+
+        int run() {
+            a_count = _a->read();
+            if (a_count < 0) { return -1; }
+            b_count = _b->read();
+            if (b_count < 0) { return -1; }
+            if (a_count != b_count) {
+                _a->flush();
+                _b->flush();
+                return 0;
+            }
+
+            if (out.aquire() < 0) { return -1; }
+            if constexpr (std::is_same_v<T, complex_t>) {
+                volk_32fc_x2_multiply_32fc(out.data, _a->data, _b->data, a_count);
+            }
+            else {
+                volk_32f_x2_multiply_32f(out.data, _a->data, _b->data, a_count);
+            }
+
+            _a->flush();
+            _b->flush();
+            out.write(a_count);
+            return a_count;
+        }
+
+        stream<T> out;
+
+    private:
+        int a_count, b_count;
+        stream<T>* _a;
+        stream<T>* _b;
+
+    };
+}

core/src/dsp/processing.h

@@ -0,0 +1,291 @@
+#pragma once
+#include <dsp/block.h>
+#include <fftw3.h>
+#include <volk/volk.h>
+#include <spdlog/spdlog.h>
+#include <string.h>
+
+namespace dsp {
+    template <class T>
+    class FrequencyXlator : public generic_block<FrequencyXlator<T>> {
+    public:
+        FrequencyXlator() {}
+
+        FrequencyXlator(stream<complex_t>* in, float sampleRate, float freq) { init(in, sampleRate, freq); }
+
+        ~FrequencyXlator() {
+            generic_block<FrequencyXlator<T>>::stop();
+        }
+
+        void init(stream<complex_t>* in, float sampleRate, float freq) {
+            _in = in;
+            _sampleRate = sampleRate;
+            _freq = freq;
+            phase = lv_cmake(1.0f, 0.0f);
+            phaseDelta = lv_cmake(std::cos((_freq / _sampleRate) * 2.0f * FL_M_PI), std::sin((_freq / _sampleRate) * 2.0f * FL_M_PI));
+            generic_block<FrequencyXlator<T>>::registerInput(_in);
+            generic_block<FrequencyXlator<T>>::registerOutput(&out);
+        }
+
+        void setInputSize(stream<complex_t>* in) {
+            std::lock_guard<std::mutex> lck(generic_block<FrequencyXlator<T>>::ctrlMtx);
+            generic_block<FrequencyXlator<T>>::tempStop();
+            generic_block<FrequencyXlator<T>>::unregisterInput(_in);
+            _in = in;
+            generic_block<FrequencyXlator<T>>::registerInput(_in);
+            generic_block<FrequencyXlator<T>>::tempStart();
+        }
+
+        void setSampleRate(float sampleRate) {
+            // No need to restart
+            _sampleRate = sampleRate;
+            phaseDelta = lv_cmake(std::cos((_freq / _sampleRate) * 2.0f * FL_M_PI), std::sin((_freq / _sampleRate) * 2.0f * FL_M_PI));
+        }
+
+        float getSampleRate() {
+            return _sampleRate;
+        }
+
+        void setFrequency(float freq) {
+            // No need to restart
+            _freq = freq;
+            phaseDelta = lv_cmake(std::cos((_freq / _sampleRate) * 2.0f * FL_M_PI), std::sin((_freq / _sampleRate) * 2.0f * FL_M_PI));
+        }
+
+        float getFrequency() {
+            return _freq;
+        }
+
+        int run() {
+            count = _in->read();
+            if (count < 0) { return -1; }
+
+            if (out.aquire() < 0) { return -1; }
+
+            // TODO: Do float xlation
+            if constexpr (std::is_same_v<T, float>) {
+                spdlog::error("XLATOR NOT IMPLEMENTED FOR FLOAT");
+            }
+            if constexpr (std::is_same_v<T, complex_t>) {
+                volk_32fc_s32fc_x2_rotator_32fc((lv_32fc_t*)out.data, (lv_32fc_t*)_in->data, phaseDelta, &phase, count);
+            }
+
+            _in->flush();
+            out.write(count);
+            return count;
+        }
+
+        stream<complex_t> out;
+
+    private:
+        int count;
+        float _sampleRate;
+        float _freq;
+        lv_32fc_t phaseDelta;
+        lv_32fc_t phase;
+        stream<complex_t>* _in;
+
+    };
+
+    class AGC : public generic_block<AGC> {
+    public:
+        AGC() {}
+
+        AGC(stream<float>* in, float ratio) { init(in, ratio); }
+
+        ~AGC() { generic_block<AGC>::stop(); }
+
+        void init(stream<float>* in, float ratio) {
+            _in = in;
+            _ratio = ratio;
+            generic_block<AGC>::registerInput(_in);
+            generic_block<AGC>::registerOutput(&out);
+        }
+
+        void setInput(stream<float>* in) {
+            std::lock_guard<std::mutex> lck(generic_block<AGC>::ctrlMtx);
+            generic_block<AGC>::tempStop();
+            generic_block<AGC>::unregisterInput(_in);
+            _in = in;
+            generic_block<AGC>::registerInput(_in);
+            generic_block<AGC>::tempStart();
+        }
+
+        int run() {
+            count = _in->read();
+            if (count < 0) { return -1; }
+
+            if (out.aquire() < 0) { return -1; }
+
+            for (int i = 0; i < count; i++) {
+                level = (fabsf(_in->data[i]) * _ratio) + (level * (1.0f - _ratio));
+                out.data[i] = _in->data[i] / level;
+            }
+
+            
+
+            _in->flush();
+            out.write(count);
+            return count;
+        }
+
+        stream<float> out;
+
+    private:
+        int count;
+        float level = 1.0f;
+        float _ratio;
+        stream<float>* _in;
+
+    };
+
+    template <class T>
+    class Volume : public generic_block<Volume<T>> {
+    public:
+        Volume() {}
+
+        Volume(stream<T>* in, float volume) { init(in, volume); }
+
+        ~Volume() { generic_block<Volume<T>>::stop(); }
+
+        void init(stream<T>* in, float volume) {
+            _in = in;
+            _volume = volume;
+            generic_block<Volume<T>>::registerInput(_in);
+            generic_block<Volume<T>>::registerOutput(&out);
+        }
+
+        void setInputSize(stream<T>* in) {
+            std::lock_guard<std::mutex> lck(generic_block<Volume<T>>::ctrlMtx);
+            generic_block<Volume<T>>::tempStop();
+            generic_block<Volume<T>>::unregisterInput(_in);
+            _in = in;
+            generic_block<Volume<T>>::registerInput(_in);
+            generic_block<Volume<T>>::tempStart();
+        }
+
+        void setVolume(float volume) {
+            _volume = volume;
+            level = powf(_volume, 2);
+        }
+
+        float getVolume() {
+            return _volume;
+        }
+
+        void setMuted(bool muted) {
+            _muted = muted;
+        }
+
+        bool getMuted() {
+            return _muted;
+        }
+
+        int run() {
+            count = _in->read();
+            if (count < 0) { return -1; }
+
+            if (out.aquire() < 0) { return -1; }
+
+            if (_muted) {
+                if constexpr (std::is_same_v<T, stereo_t>) {
+                    memset(out.data, 0, sizeof(stereo_t) * count);
+                }
+                else {
+                    memset(out.data, 0, sizeof(float) * count);
+                }
+            }
+            else {
+                if constexpr (std::is_same_v<T, stereo_t>) {
+                    volk_32f_s32f_multiply_32f((float*)out.data, (float*)_in->data, level, count * 2);
+                }
+                else {
+                    volk_32f_s32f_multiply_32f((float*)out.data, (float*)_in->data, level, count);
+                }
+            }
+
+            _in->flush();
+            out.write(count);
+            return count;
+        }
+
+        stream<T> out;
+
+    private:
+        int count;
+        float level = 1.0f;
+        float _volume = 1.0f;
+        bool _muted = false;
+        stream<T>* _in;
+
+    };
+
+    class Squelch : public generic_block<Squelch> {
+    public:
+        Squelch() {}
+
+        Squelch(stream<complex_t>* in, float level) { init(in, level); }
+
+        ~Squelch() {
+            generic_block<Squelch>::stop();
+            delete[] normBuffer;
+        }
+
+        void init(stream<complex_t>* in, float level) {
+            _in = in;
+            _level = level;
+            normBuffer = new float[STREAM_BUFFER_SIZE];
+            generic_block<Squelch>::registerInput(_in);
+            generic_block<Squelch>::registerOutput(&out);
+        }
+
+        void setInput(stream<complex_t>* in) {
+            std::lock_guard<std::mutex> lck(generic_block<Squelch>::ctrlMtx);
+            generic_block<Squelch>::tempStop();
+            generic_block<Squelch>::unregisterInput(_in);
+            _in = in;
+            generic_block<Squelch>::registerInput(_in);
+            generic_block<Squelch>::tempStart();
+        }
+
+        void setLevel(float level) {
+            _level = level;
+        }
+
+        float getLevel() {
+            return _level;
+        }
+
+        int run() {
+            count = _in->read();
+            if (count < 0) { return -1; }
+
+            if (out.aquire() < 0) { return -1; }
+            float sum = 0.0f;
+            volk_32fc_magnitude_32f(normBuffer, (lv_32fc_t*)_in->data, count);
+            volk_32f_accumulator_s32f(&sum, normBuffer, count);
+            sum /= (float)count;
+
+            if (10.0f * log10f(sum) >= _level) {
+                memcpy(out.data, _in->data, count * sizeof(complex_t));
+            }
+            else {
+                memset(out.data, 0, count * sizeof(complex_t));
+            }
+
+            _in->flush();
+            out.write(count);
+            return count; 
+        }
+
+        stream<complex_t> out;
+
+
+    private:
+        int count;
+        float* normBuffer;
+        float _level = -50.0f;
+        stream<complex_t>* _in;
+
+    };
+}

core/src/dsp/resampling.h

@@ -0,0 +1,154 @@
+#pragma once
+#include <dsp/block.h>
+#include <dsp/window.h>
+#include <numeric>
+#include <string.h>
+
+namespace dsp {
+    template <class T>
+    class PolyphaseResampler : public generic_block<PolyphaseResampler<T>> {
+    public:
+        PolyphaseResampler() {}
+
+        PolyphaseResampler(stream<T>* in, dsp::filter_window::generic_window* window, float inSampleRate, float outSampleRate) { init(in, window, inSampleRate, outSampleRate); }
+
+        ~PolyphaseResampler() {
+            generic_block<PolyphaseResampler<T>>::stop();
+            volk_free(buffer);
+            volk_free(taps);
+        }
+
+        void init(stream<T>* in, dsp::filter_window::generic_window* window, float inSampleRate, float outSampleRate) {
+            _in = in;
+            _window = window;
+            _inSampleRate = inSampleRate;
+            _outSampleRate = outSampleRate;
+
+            int _gcd = std::gcd((int)_inSampleRate, (int)_outSampleRate);
+            _interp = _outSampleRate / _gcd;
+            _decim = _inSampleRate / _gcd;
+
+            tapCount = _window->getTapCount();
+            taps = (float*)volk_malloc(tapCount * sizeof(float), volk_get_alignment());
+            _window->createTaps(taps, tapCount, _interp);
+
+            buffer = (T*)volk_malloc(STREAM_BUFFER_SIZE * sizeof(T) * 2, volk_get_alignment());
+            memset(buffer, 0, STREAM_BUFFER_SIZE * sizeof(T) * 2);
+            bufStart = &buffer[tapCount];
+            generic_block<PolyphaseResampler<T>>::registerInput(_in);
+            generic_block<PolyphaseResampler<T>>::registerOutput(&out);
+        }
+
+        void setInput(stream<T>* in) {
+            std::lock_guard<std::mutex> lck(generic_block<PolyphaseResampler<T>>::ctrlMtx);
+            generic_block<PolyphaseResampler<T>>::tempStop();
+            generic_block<PolyphaseResampler<T>>::unregisterInput(_in);
+            _in = in;
+            generic_block<PolyphaseResampler<T>>::registerInput(_in);
+            generic_block<PolyphaseResampler<T>>::tempStart();
+        }
+
+        void setInSampleRate(float inSampleRate) {
+            std::lock_guard<std::mutex> lck(generic_block<PolyphaseResampler<T>>::ctrlMtx);
+            generic_block<PolyphaseResampler<T>>::tempStop();
+            _inSampleRate = inSampleRate;
+            int _gcd = std::gcd((int)_inSampleRate, (int)_outSampleRate);
+            _interp = _outSampleRate / _gcd;
+            _decim = _inSampleRate / _gcd;
+            generic_block<PolyphaseResampler<T>>::tempStart();
+        }
+
+        void setOutSampleRate(float outSampleRate) {
+            std::lock_guard<std::mutex> lck(generic_block<PolyphaseResampler<T>>::ctrlMtx);
+            generic_block<PolyphaseResampler<T>>::tempStop();
+            _outSampleRate = outSampleRate;
+            int _gcd = std::gcd((int)_inSampleRate, (int)_outSampleRate);
+            _interp = _outSampleRate / _gcd;
+            _decim = _inSampleRate / _gcd;
+            generic_block<PolyphaseResampler<T>>::tempStart();
+        }
+
+        int getInterpolation() {
+            return _interp;
+        }
+
+        int getDecimation() {
+            return _decim;
+        }
+
+        void updateWindow(dsp::filter_window::generic_window* window) {
+            std::lock_guard<std::mutex> lck(generic_block<PolyphaseResampler<T>>::ctrlMtx);
+            generic_block<PolyphaseResampler<T>>::tempStop();
+            _window = window;
+            volk_free(taps);
+            tapCount = window->getTapCount();
+            taps = (float*)volk_malloc(tapCount * sizeof(float), volk_get_alignment());
+            window->createTaps(taps, tapCount, _interp);
+            bufStart = &buffer[tapCount];
+            generic_block<PolyphaseResampler<T>>::tempStart();
+        }
+
+        int calcOutSize(int in) {
+            return (in * _interp) / _decim;
+        }
+
+        virtual int run() override {
+            count = _in->read();
+            if (count < 0) {
+                return -1;
+            }
+
+            int outCount = calcOutSize(count);
+
+            memcpy(&buffer[tapCount], _in->data, count * sizeof(T));
+            _in->flush();
+
+            // Write to output
+            if (out.aquire() < 0) {
+                return -1;
+            }
+            int outIndex = 0;
+            if constexpr (std::is_same_v<T, float>) {
+                for (int i = 0; outIndex < outCount; i += _decim) {
+                    out.data[outIndex] = 0;
+                    for (int j = i % _interp; j < tapCount; j += _interp) {
+                        out.data[outIndex] += buffer[((i - j) / _interp) + tapCount] * taps[j];
+                    }
+                    outIndex++;
+                }
+            }
+            if constexpr (std::is_same_v<T, complex_t>) {
+                for (int i = 0; outIndex < outCount; i += _decim) {
+                    out.data[outIndex].i = 0;
+                    out.data[outIndex].q = 0;
+                    for (int j = i % _interp; j < tapCount; j += _interp) {
+                        out.data[outIndex].i += buffer[((i - j) / _interp) + tapCount].i * taps[j];
+                        out.data[outIndex].q += buffer[((i - j) / _interp) + tapCount].q * taps[j];
+                    }
+                    outIndex++;
+                }
+            }
+            out.write(outCount);
+
+            memmove(buffer, &buffer[count], tapCount * sizeof(T));
+
+            return count;
+        }
+
+        stream<T> out;
+
+    private:
+        int count;
+        stream<T>* _in;
+
+        dsp::filter_window::generic_window* _window;
+
+        T* bufStart;
+        T* buffer;
+        int tapCount;
+        int _interp, _decim;
+        float _inSampleRate, _outSampleRate;
+        float* taps;
+
+    };
+}

core/src/dsp/routing.h

@@ -0,0 +1,186 @@
+#pragma once
+#include <dsp/block.h>
+#include <dsp/buffer.h>
+#include <string.h>
+#include <numeric>
+#include <spdlog/spdlog.h>
+
+namespace dsp {
+    template <class T>
+    class Splitter : public generic_block<Splitter<T>> {
+    public:
+        Splitter() {}
+
+        Splitter(stream<T>* in) { init(in); }
+
+        ~Splitter() { generic_block<Splitter>::stop(); }
+
+        void init(stream<T>* in) {
+            _in = in;
+            generic_block<Splitter>::registerInput(_in);
+        }
+
+        void setInput(stream<T>* in) {
+            std::lock_guard<std::mutex> lck(generic_block<Splitter>::ctrlMtx);
+            generic_block<Splitter>::tempStop();
+            generic_block<Splitter>::unregisterInput(_in);
+            _in = in;
+            generic_block<Splitter>::registerInput(_in);
+            generic_block<Splitter>::tempStart();
+        }
+
+        void bindStream(stream<T>* stream) {
+            std::lock_guard<std::mutex> lck(generic_block<Splitter>::ctrlMtx);
+            generic_block<Splitter>::tempStop();
+            out.push_back(stream);
+            generic_block<Splitter>::registerOutput(stream);
+            generic_block<Splitter>::tempStart();
+        }
+
+        void unbindStream(stream<T>* stream) {
+            std::lock_guard<std::mutex> lck(generic_block<Splitter>::ctrlMtx);
+            generic_block<Splitter>::tempStop();
+            generic_block<Splitter>::unregisterOutput(stream);
+            out.erase(std::remove(out.begin(), out.end(), stream), out.end());
+            generic_block<Splitter>::tempStart();
+        }
+
+    private:
+        int run() {
+            // TODO: If too slow, buffering might be necessary
+            int count = _in->read();
+            if (count < 0) { return -1; }
+            for (const auto& stream : out) {
+                if (stream->aquire() < 0) { return -1; } 
+                memcpy(stream->data, _in->data, count * sizeof(T));
+                stream->write(count);
+            }
+            _in->flush();
+            return count;
+        }
+
+        stream<T>* _in;
+        std::vector<stream<T>*> out;
+
+    };
+
+
+    // NOTE: I'm not proud of this, it's BAD and just taken from the previous DSP, but it works...
+    template <class T>
+    class Reshaper : public generic_block<Reshaper<T>> {
+    public:
+        Reshaper() {}
+
+        Reshaper(stream<T>* in, int keep, int skip) { init(in, keep, skip); }
+
+        ~Reshaper() { generic_block<Reshaper<T>>::stop(); }
+
+        void init(stream<T>* in, int keep, int skip) {
+            _in = in;
+            _keep = keep;
+            _skip = skip;
+            ringBuf.init(keep * 2);
+            generic_block<Reshaper<T>>::registerInput(_in);
+            generic_block<Reshaper<T>>::registerOutput(&out);
+        }
+
+        void setInput(stream<T>* in) {
+            std::lock_guard<std::mutex> lck(generic_block<Reshaper<T>>::ctrlMtx);
+            generic_block<Reshaper<T>>::tempStop();
+            generic_block<Reshaper<T>>::unregisterInput(_in);
+            _in = in;
+            generic_block<Reshaper<T>>::registerInput(_in);
+            generic_block<Reshaper<T>>::tempStart();
+        }
+
+        void setKeep(int keep) {
+            std::lock_guard<std::mutex> lck(generic_block<Reshaper<T>>::ctrlMtx);
+            generic_block<Reshaper<T>>::tempStop();
+            generic_block<Reshaper<T>>::unregisterInput(_in);
+            _keep = keep;
+            ringBuf.setMaxLatency(keep * 2);
+            generic_block<Reshaper<T>>::registerInput(_in);
+            generic_block<Reshaper<T>>::tempStart();
+        }
+
+        void setSkip(int skip) {
+            std::lock_guard<std::mutex> lck(generic_block<Reshaper<T>>::ctrlMtx);
+            generic_block<Reshaper<T>>::tempStop();
+            generic_block<Reshaper<T>>::unregisterInput(_in);
+            _skip = skip;
+            generic_block<Reshaper<T>>::registerInput(_in);
+            generic_block<Reshaper<T>>::tempStart();
+        }
+
+        int run() {
+            int count = _in->read();
+            if (count < 0) { return -1; }
+            ringBuf.write(_in->data, count);
+            _in->flush();
+            return count;
+        }
+
+        stream<T> out;
+
+    private:
+        void doStart() {
+            workThread = std::thread(&Reshaper<T>::loop, this);
+            bufferWorkerThread = std::thread(&Reshaper<T>::bufferWorker, this);
+        }
+
+        void loop() {
+            while (run() >= 0);
+        }
+
+        void doStop() {
+            _in->stopReader();
+            ringBuf.stopReader();
+            out.stopWriter();
+            ringBuf.stopWriter();
+
+            if (workThread.joinable()) {
+                workThread.join();
+            }
+            if (bufferWorkerThread.joinable()) {
+                bufferWorkerThread.join();
+            }
+
+            _in->clearReadStop();
+            ringBuf.clearReadStop();
+            out.clearWriteStop();
+            ringBuf.clearWriteStop();
+        }
+
+        void bufferWorker() {
+            complex_t* buf = new complex_t[_keep];
+            bool delay = _skip < 0;
+
+            int readCount = std::min<int>(_keep + _skip, _keep);
+            int skip = std::max<int>(_skip, 0);
+            int delaySize = (-_skip) * sizeof(complex_t);
+
+            complex_t* start = &buf[std::max<int>(-_skip, 0)];
+            complex_t* delayStart = &buf[_keep + _skip];
+
+            while (true) {
+                if (delay) {
+                    memmove(buf, delayStart, delaySize);
+                }
+                if (ringBuf.readAndSkip(start, readCount, skip) < 0) { break; };
+                if (out.aquire() < 0) { break; }
+                memcpy(out.data, buf, _keep * sizeof(complex_t));
+                out.write(_keep);
+            }
+            delete[] buf;
+        }
+
+        stream<T>* _in;
+        int _outBlockSize;
+        RingBuffer<T> ringBuf;
+        std::thread bufferWorkerThread;
+        std::thread workThread;
+        int _keep, _skip;
+        
+
+    };
+}

core/src/dsp/sink.h

@@ -0,0 +1,140 @@
+#pragma once
+#include <dsp/block.h>
+#include <dsp/buffer.h>
+
+namespace dsp {
+    template <class T>
+    class HandlerSink : public generic_block<HandlerSink<T>> {
+    public:
+        HandlerSink() {}
+
+        HandlerSink(stream<T>* in, void (*handler)(T* data, int count, void* ctx), void* ctx) { init(in, handler, ctx); }
+
+        ~HandlerSink() { generic_block<HandlerSink<T>>::stop(); }
+
+        void init(stream<T>* in, void (*handler)(T* data, int count, void* ctx), void* ctx) {
+            _in = in;
+            _handler = handler;
+            _ctx = ctx;
+            generic_block<HandlerSink<T>>::registerInput(_in);
+        }
+
+        void setInput(stream<T>* in) {
+            std::lock_guard<std::mutex> lck(generic_block<HandlerSink<T>>::ctrlMtx);
+            generic_block<HandlerSink<T>>::tempStop();
+            generic_block<HandlerSink<T>>::unregisterInput(_in);
+            _in = in;
+            generic_block<HandlerSink<T>>::registerInput(_in);
+            generic_block<HandlerSink<T>>::tempStart();
+        }
+
+        void setHandler(void (*handler)(T* data, int count, void* ctx), void* ctx) {
+            std::lock_guard<std::mutex> lck(generic_block<HandlerSink<T>>::ctrlMtx);
+            generic_block<HandlerSink<T>>::tempStop();
+            _handler = handler;
+            _ctx = ctx;
+            generic_block<HandlerSink<T>>::tempStart();
+        }
+
+        int run() {
+            count = _in->read();
+            if (count < 0) { return -1; }
+            _handler(_in->data, count, _ctx);
+            _in->flush();
+            return count;
+        }
+
+    private:
+        int count;
+        stream<T>* _in;
+        void (*_handler)(T* data, int count, void* ctx);
+        void* _ctx;
+
+    };
+
+    template <class T>
+    class RingBufferSink : public generic_block<RingBufferSink<T>> {
+    public:
+        RingBufferSink() {}
+
+        RingBufferSink(stream<T>* in) { init(in); }
+
+        ~RingBufferSink() { generic_block<RingBufferSink<T>>::stop(); }
+
+        void init(stream<T>* in) {
+            _in = in;
+            data.init(480); // TODO: Use an argument
+            generic_block<RingBufferSink<T>>::registerInput(_in);
+        }
+
+        void setInput(stream<T>* in) {
+            std::lock_guard<std::mutex> lck(generic_block<RingBufferSink<T>>::ctrlMtx);
+            generic_block<RingBufferSink<T>>::tempStop();
+            generic_block<RingBufferSink<T>>::unregisterInput(_in);
+            _in = in;
+            generic_block<RingBufferSink<T>>::registerInput(_in);
+            generic_block<RingBufferSink<T>>::tempStart();
+        }
+
+        int run() {
+            count = _in->read();
+            if (count < 0) { return -1; }
+            if (data.write(_in->data, count) < 0) { return -1; }
+            _in->flush();
+            return count;
+        }
+
+        RingBuffer<T> data;
+
+    private:
+        void doStop() {
+            _in->stopReader();
+            data.stopWriter();
+            if (generic_block<RingBufferSink<T>>::workerThread.joinable()) {
+                generic_block<RingBufferSink<T>>::workerThread.join();
+            }
+            _in->clearReadStop();
+            data.clearWriteStop();
+        }
+
+        int count;
+        stream<T>* _in;
+
+    };
+
+    template <class T>
+    class NullSink : public generic_block<NullSink<T>> {
+    public:
+        NullSink() {}
+
+        NullSink(stream<T>* in) { init(in); }
+
+        ~NullSink() { generic_block<NullSink<T>>::stop(); }
+
+        void init(stream<T>* in) {
+            _in = in;
+            generic_block<NullSink<T>>::registerInput(_in);
+        }
+
+        void setInput(stream<T>* in) {
+            std::lock_guard<std::mutex> lck(generic_block<NullSink<T>>::ctrlMtx);
+            generic_block<NullSink<T>>::tempStop();
+            generic_block<NullSink<T>>::unregisterInput(_in);
+            _in = in;
+            generic_block<NullSink<T>>::registerInput(_in);
+            generic_block<NullSink<T>>::tempStart();
+        }
+
+        int run() {
+            count = _in->read();
+            if (count < 0) { return -1; }
+            _in->flush();
+            return count;
+        }
+
+    private:
+        int count;
+        stream<T>* _in;
+
+    };
+}

core/src/dsp/source.h

@@ -0,0 +1,75 @@
+#pragma once
+#include <dsp/block.h>
+
+namespace dsp {
+    class SineSource : public generic_block<SineSource> {
+    public:
+        SineSource() {}
+
+        SineSource(int blockSize, float sampleRate, float freq) { init(blockSize, sampleRate, freq); }
+
+        ~SineSource() { generic_block<SineSource>::stop(); }
+
+        void init(int blockSize, float sampleRate, float freq) {
+            _blockSize = blockSize;
+            _sampleRate = sampleRate;
+            _freq = freq;
+            zeroPhase = (lv_32fc_t*)volk_malloc(STREAM_BUFFER_SIZE * sizeof(lv_32fc_t), volk_get_alignment());
+            for (int i = 0; i < STREAM_BUFFER_SIZE; i++) {
+                zeroPhase[i] = lv_cmake(1.0f, 0.0f);
+            }
+            phase = lv_cmake(1.0f, 0.0f);
+            phaseDelta = lv_cmake(std::cos((_freq / _sampleRate) * 2.0f * FL_M_PI), std::sin((_freq / _sampleRate) * 2.0f * FL_M_PI));
+            generic_block<SineSource>::registerOutput(&out);
+        }
+
+        void setBlockSize(int blockSize) {
+            std::lock_guard<std::mutex> lck(generic_block<SineSource>::ctrlMtx);
+            generic_block<SineSource>::tempStop();
+            _blockSize = blockSize;
+            generic_block<SineSource>::tempStart();
+        }
+
+        int getBlockSize() {
+            return _blockSize;
+        }
+
+        void setSampleRate(float sampleRate) {
+            // No need to restart
+            _sampleRate = sampleRate;
+            phaseDelta = lv_cmake(std::cos((_freq / _sampleRate) * 2.0f * FL_M_PI), std::sin((_freq / _sampleRate) * 2.0f * FL_M_PI));
+        }
+
+        float getSampleRate() {
+            return _sampleRate;
+        }
+
+        void setFrequency(float freq) {
+            // No need to restart
+            _freq = freq;
+            phaseDelta = lv_cmake(std::cos((_freq / _sampleRate) * 2.0f * FL_M_PI), std::sin((_freq / _sampleRate) * 2.0f * FL_M_PI));
+        }
+
+        float getFrequency() {
+            return _freq;
+        }
+
+        int run() {
+            if (out.aquire() < 0) { return -1; }
+            volk_32fc_s32fc_x2_rotator_32fc((lv_32fc_t*)out.data, zeroPhase, phaseDelta, &phase, _blockSize);
+            out.write(_blockSize);
+            return _blockSize;
+        }
+
+        stream<complex_t> out;
+
+    private:
+        int _blockSize;
+        float _sampleRate;
+        float _freq;
+        lv_32fc_t phaseDelta;
+        lv_32fc_t phase;
+        lv_32fc_t* zeroPhase;
+
+    };
+}

core/src/dsp/stream.h

@@ -0,0 +1,108 @@
+#pragma once
+#include <mutex>
+#include <condition_variable>
+#include <volk/volk.h>
+
+// 1MB buffer
+#define STREAM_BUFFER_SIZE  1000000
+
+namespace dsp {
+    class untyped_steam {
+    public:
+        virtual int aquire() { return -1; }
+        virtual void write(int size) {}
+        virtual int read() { return -1; }
+        virtual void flush() {}
+        virtual void stopReader() {}
+        virtual void clearReadStop() {}
+        virtual void stopWriter() {}
+        virtual void clearWriteStop() {}
+    };
+
+    template <class T>
+    class stream : public untyped_steam {
+    public:
+        stream() {
+            data = (T*)volk_malloc(STREAM_BUFFER_SIZE * sizeof(T), volk_get_alignment());
+        }
+
+        int aquire() {
+            waitReady();
+            if (writerStop) {
+                return -1;
+            }
+            return 0;
+        }
+
+        void write(int size) {
+            {
+                std::lock_guard<std::mutex> lck(sigMtx);
+                contentSize = size;
+                dataReady = true;
+            }
+            cv.notify_one();
+        }
+
+        int read() {
+            waitData();
+            if (readerStop) {
+                return -1;
+            }
+            return contentSize;
+        }
+
+        void flush() {
+            {
+                std::lock_guard<std::mutex> lck(sigMtx);
+                dataReady = false;
+            }
+            cv.notify_one();
+        }
+
+        void stopReader() {
+            {
+                std::lock_guard<std::mutex> lck(sigMtx);
+                readerStop = true;
+            }
+            cv.notify_one();
+        }
+
+        void clearReadStop() {
+            readerStop = false;
+        }
+
+        void stopWriter() {
+            {
+                std::lock_guard<std::mutex> lck(sigMtx);
+                writerStop = true;
+            }
+            cv.notify_one();
+        }
+
+        void clearWriteStop() {
+            writerStop = false;
+        }
+
+        T* data;
+
+    private:
+        void waitReady() {
+            std::unique_lock<std::mutex> lck(sigMtx);
+            cv.wait(lck, [this]{ return (!dataReady || writerStop); });
+        }
+
+        void waitData() {
+            std::unique_lock<std::mutex> lck(sigMtx);
+            cv.wait(lck, [this]{ return (dataReady || readerStop); });
+        }
+
+        std::mutex sigMtx;
+        std::condition_variable cv;
+        bool dataReady = false;
+
+        bool readerStop = false;
+        bool writerStop = false;
+
+        int contentSize = 0;
+    };
+}

core/src/dsp/types.h

@@ -5,4 +5,9 @@ namespace dsp {
         float q;
         float i;
     };
+
+    struct stereo_t {
+        float l;
+        float r;
     };
+}

core/src/dsp/vfo.h

@@ -0,0 +1,112 @@
+#pragma once
+#include <dsp/block.h>
+#include <dsp/window.h>
+#include <dsp/resampling.h>
+#include <dsp/processing.h>
+#include <algorithm>
+
+namespace dsp {
+    class VFO {
+    public:
+        VFO() {}
+
+        ~VFO() { stop(); }
+
+        VFO(stream<complex_t>* in, float offset, float inSampleRate, float outSampleRate, float bandWidth) {
+            init(in, offset, inSampleRate, outSampleRate, bandWidth);
+        };
+
+        void init(stream<complex_t>* in, float offset, float inSampleRate, float outSampleRate, float bandWidth) {
+            _in = in;
+            _offset = offset;
+            _inSampleRate = inSampleRate;
+            _outSampleRate = outSampleRate;
+            _bandWidth = bandWidth;
+
+            float realCutoff = std::min<float>(_bandWidth, std::min<float>(_inSampleRate, _outSampleRate)) / 2.0f;
+
+            xlator.init(_in, _inSampleRate, -_offset);
+            win.init(realCutoff, realCutoff, inSampleRate);
+            resamp.init(&xlator.out, &win, _inSampleRate, _outSampleRate);
+
+            win.setSampleRate(_inSampleRate * resamp.getInterpolation());
+            resamp.updateWindow(&win);
+
+            out = &resamp.out;
+        }
+
+        void start() {
+            if (running) { return; }
+            xlator.start();
+            resamp.start();
+        }
+
+        void stop() {
+            if (!running) { return; }
+            xlator.stop();
+            resamp.stop();
+        }
+
+        void setInSampleRate(float inSampleRate) {
+            _inSampleRate = inSampleRate;
+            if (running) { xlator.stop(); resamp.stop(); }
+            xlator.setSampleRate(_inSampleRate);
+            resamp.setInSampleRate(_inSampleRate);
+            float realCutoff = std::min<float>(_bandWidth, std::min<float>(_inSampleRate, _outSampleRate)) / 2.0f;
+            win.setSampleRate(_inSampleRate * resamp.getInterpolation());
+            win.setCutoff(realCutoff);
+            win.setTransWidth(realCutoff);
+            resamp.updateWindow(&win);
+            if (running) { xlator.start(); resamp.start(); }
+        }
+
+        void setOutSampleRate(float outSampleRate) {
+            _outSampleRate = outSampleRate;
+            if (running) { resamp.stop(); }
+            resamp.setOutSampleRate(_outSampleRate);
+            float realCutoff = std::min<float>(_bandWidth, std::min<float>(_inSampleRate, _outSampleRate)) / 2.0f;
+            win.setSampleRate(_inSampleRate * resamp.getInterpolation());
+            win.setCutoff(realCutoff);
+            win.setTransWidth(realCutoff);
+            resamp.updateWindow(&win);
+            if (running) { resamp.start(); }
+        }
+
+        void setOutSampleRate(float outSampleRate, float bandWidth) {
+            _outSampleRate = outSampleRate;
+            _bandWidth = bandWidth;
+            if (running) { resamp.stop(); }
+            resamp.setOutSampleRate(_outSampleRate);
+            float realCutoff = std::min<float>(_bandWidth, std::min<float>(_inSampleRate, _outSampleRate)) / 2.0f;
+            win.setSampleRate(_inSampleRate * resamp.getInterpolation());
+            win.setCutoff(realCutoff);
+            win.setTransWidth(realCutoff);
+            resamp.updateWindow(&win);
+            if (running) { resamp.start(); }
+        }
+
+        void setOffset(float offset) {
+            _offset = offset;
+            xlator.setFrequency(-_offset);
+        }
+
+        void setBandwidth(float bandWidth) {
+            _bandWidth = bandWidth;
+            float realCutoff = std::min<float>(_bandWidth, std::min<float>(_inSampleRate, _outSampleRate)) / 2.0f;
+            win.setCutoff(realCutoff);
+            win.setTransWidth(realCutoff);
+            resamp.updateWindow(&win);
+        }
+
+        stream<complex_t>* out;
+
+    private:
+        bool running = false;
+        float _offset, _inSampleRate, _outSampleRate, _bandWidth;
+        filter_window::BlackmanWindow win;
+        stream<complex_t>* _in;
+        FrequencyXlator<complex_t> xlator;
+        PolyphaseResampler<complex_t> resamp;
+
+    };
+}

core/src/dsp/window.h

@@ -0,0 +1,76 @@
+#pragma once
+#include <dsp/block.h>
+
+namespace dsp {
+    namespace filter_window {
+        class generic_window {
+        public:
+            virtual int getTapCount() { return -1; }
+            virtual void createTaps(float* taps, int tapCount, float factor = 1.0f) {}
+        };
+
+        class BlackmanWindow : public filter_window::generic_window {
+        public:
+            BlackmanWindow() {}
+            BlackmanWindow(float cutoff, float transWidth, float sampleRate) { init(cutoff, transWidth, sampleRate); }
+
+            void init(float cutoff, float transWidth, float sampleRate) {
+                _cutoff = cutoff;
+                _transWidth = transWidth;
+                _sampleRate = sampleRate;
+            }
+
+            void setSampleRate(float sampleRate) {
+                _sampleRate = sampleRate;
+            }
+
+            void setCutoff(float cutoff) {
+                _cutoff = cutoff;
+            }
+            
+            void setTransWidth(float transWidth) {
+                _transWidth = transWidth;
+            }
+
+            int getTapCount() {
+                float fc = _cutoff / _sampleRate;
+                if (fc > 1.0f) {
+                    fc = 1.0f;
+                }
+
+                int _M = 4.0f / (_transWidth / _sampleRate);
+                if (_M < 4) {
+                    _M = 4;
+                }
+
+                if (_M % 2 == 0) { _M++; }
+
+                return _M;
+            }
+
+            void createTaps(float* taps, int tapCount, float factor = 1.0f) {
+                float fc = _cutoff / _sampleRate;
+                if (fc > 1.0f) {
+                    fc = 1.0f;
+                }
+                float tc = tapCount;
+                float sum = 0.0f;
+                float val;
+                for (int i = 0; i < tapCount; i++) {
+                    val = (sin(2.0f * FL_M_PI * fc * ((float)i - (tc / 2))) / ((float)i - (tc / 2))) * 
+                        (0.42f - (0.5f * cos(2.0f * FL_M_PI / tc)) + (0.8f * cos(4.0f * FL_M_PI / tc)));
+                    taps[i] = val; // tapCount - i - 1
+                    sum += val;
+                }
+                for (int i = 0; i < tapCount; i++) {
+                    taps[i] *= factor;
+                    taps[i] /= sum;
+                }
+            }
+
+        private:
+            float _cutoff, _transWidth, _sampleRate;
+
+        };
+    }
+}

core/src/duktape/duk_console.c

@@ -0,0 +1,185 @@
+/*
+ *  Minimal 'console' binding.
+ *
+ *  https://github.com/DeveloperToolsWG/console-object/blob/master/api.md
+ *  https://developers.google.com/web/tools/chrome-devtools/debug/console/console-reference
+ *  https://developer.mozilla.org/en/docs/Web/API/console
+ */
+
+#include <stdio.h>
+#include <stdarg.h>
+#include "duktape.h"
+#include "duk_console.h"
+
+/* XXX: Add some form of log level filtering. */
+
+/* XXX: Should all output be written via e.g. console.write(formattedMsg)?
+ * This would make it easier for user code to redirect all console output
+ * to a custom backend.
+ */
+
+/* XXX: Init console object using duk_def_prop() when that call is available. */
+
+static duk_ret_t duk__console_log_helper(duk_context *ctx, const char *error_name) {
+	duk_uint_t flags = (duk_uint_t) duk_get_current_magic(ctx);
+	FILE *output = (flags & DUK_CONSOLE_STDOUT_ONLY) ? stdout : stderr;
+	duk_idx_t n = duk_get_top(ctx);
+	duk_idx_t i;
+
+	duk_get_global_string(ctx, "console");
+	duk_get_prop_string(ctx, -1, "format");
+
+	for (i = 0; i < n; i++) {
+		if (duk_check_type_mask(ctx, i, DUK_TYPE_MASK_OBJECT)) {
+			/* Slow path formatting. */
+			duk_dup(ctx, -1);  /* console.format */
+			duk_dup(ctx, i);
+			duk_call(ctx, 1);
+			duk_replace(ctx, i);  /* arg[i] = console.format(arg[i]); */
+		}
+	}
+
+	duk_pop_2(ctx);
+
+	duk_push_string(ctx, " ");
+	duk_insert(ctx, 0);
+	duk_join(ctx, n);
+
+	if (error_name) {
+		duk_push_error_object(ctx, DUK_ERR_ERROR, "%s", duk_require_string(ctx, -1));
+		duk_push_string(ctx, "name");
+		duk_push_string(ctx, error_name);
+		duk_def_prop(ctx, -3, DUK_DEFPROP_FORCE | DUK_DEFPROP_HAVE_VALUE);  /* to get e.g. 'Trace: 1 2 3' */
+		duk_get_prop_string(ctx, -1, "stack");
+	}
+
+	fprintf(output, "%s\n", duk_to_string(ctx, -1));
+	if (flags & DUK_CONSOLE_FLUSH) {
+		fflush(output);
+	}
+	return 0;
+}
+
+static duk_ret_t duk__console_assert(duk_context *ctx) {
+	if (duk_to_boolean(ctx, 0)) {
+		return 0;
+	}
+	duk_remove(ctx, 0);
+
+	return duk__console_log_helper(ctx, "AssertionError");
+}
+
+static duk_ret_t duk__console_log(duk_context *ctx) {
+	return duk__console_log_helper(ctx, NULL);
+}
+
+static duk_ret_t duk__console_trace(duk_context *ctx) {
+	return duk__console_log_helper(ctx, "Trace");
+}
+
+static duk_ret_t duk__console_info(duk_context *ctx) {
+	return duk__console_log_helper(ctx, NULL);
+}
+
+static duk_ret_t duk__console_warn(duk_context *ctx) {
+	return duk__console_log_helper(ctx, NULL);
+}
+
+static duk_ret_t duk__console_error(duk_context *ctx) {
+	return duk__console_log_helper(ctx, "Error");
+}
+
+static duk_ret_t duk__console_dir(duk_context *ctx) {
+	/* For now, just share the formatting of .log() */
+	return duk__console_log_helper(ctx, 0);
+}
+
+static void duk__console_reg_vararg_func(duk_context *ctx, duk_c_function func, const char *name, duk_uint_t flags) {
+	duk_push_c_function(ctx, func, DUK_VARARGS);
+	duk_push_string(ctx, "name");
+	duk_push_string(ctx, name);
+	duk_def_prop(ctx, -3, DUK_DEFPROP_HAVE_VALUE | DUK_DEFPROP_FORCE);  /* Improve stacktraces by displaying function name */
+	duk_set_magic(ctx, -1, (duk_int_t) flags);
+	duk_put_prop_string(ctx, -2, name);
+}
+
+void duk_console_init(duk_context *ctx, duk_uint_t flags) {
+	duk_uint_t flags_orig;
+
+	/* If both DUK_CONSOLE_STDOUT_ONLY and DUK_CONSOLE_STDERR_ONLY where specified,
+	 * just turn off DUK_CONSOLE_STDOUT_ONLY and keep DUK_CONSOLE_STDERR_ONLY.
+	 */
+	if ((flags & DUK_CONSOLE_STDOUT_ONLY) && (flags & DUK_CONSOLE_STDERR_ONLY)) {
+	    flags &= ~DUK_CONSOLE_STDOUT_ONLY;
+	}
+	/* Remember the (possibly corrected) flags we received. */
+	flags_orig = flags;
+
+	duk_push_object(ctx);
+
+	/* Custom function to format objects; user can replace.
+	 * For now, try JX-formatting and if that fails, fall back
+	 * to ToString(v).
+	 */
+	duk_eval_string(ctx,
+		"(function (E) {"
+		    "return function format(v){"
+		        "try{"
+		            "return E('jx',v);"
+		        "}catch(e){"
+		            "return String(v);"  /* String() allows symbols, ToString() internal algorithm doesn't. */
+		        "}"
+		    "};"
+		"})(Duktape.enc)");
+	duk_put_prop_string(ctx, -2, "format");
+
+	flags = flags_orig;
+	if (!(flags & DUK_CONSOLE_STDOUT_ONLY) && !(flags & DUK_CONSOLE_STDERR_ONLY)) {
+	    /* No output indicators were specified; these levels go to stdout. */
+	    flags |= DUK_CONSOLE_STDOUT_ONLY;
+	}
+	duk__console_reg_vararg_func(ctx, duk__console_assert, "assert", flags);
+	duk__console_reg_vararg_func(ctx, duk__console_log, "log", flags);
+	duk__console_reg_vararg_func(ctx, duk__console_log, "debug", flags);  /* alias to console.log */
+	duk__console_reg_vararg_func(ctx, duk__console_trace, "trace", flags);
+	duk__console_reg_vararg_func(ctx, duk__console_info, "info", flags);
+
+	flags = flags_orig;
+	if (!(flags & DUK_CONSOLE_STDOUT_ONLY) && !(flags & DUK_CONSOLE_STDERR_ONLY)) {
+	    /* No output indicators were specified; these levels go to stderr. */
+	    flags |= DUK_CONSOLE_STDERR_ONLY;
+	}
+	duk__console_reg_vararg_func(ctx, duk__console_warn, "warn", flags);
+	duk__console_reg_vararg_func(ctx, duk__console_error, "error", flags);
+	duk__console_reg_vararg_func(ctx, duk__console_error, "exception", flags);  /* alias to console.error */
+	duk__console_reg_vararg_func(ctx, duk__console_dir, "dir", flags);
+
+	duk_put_global_string(ctx, "console");
+
+	/* Proxy wrapping: ensures any undefined console method calls are
+	 * ignored silently.  This was required specifically by the
+	 * DeveloperToolsWG proposal (and was implemented also by Firefox:
+	 * https://bugzilla.mozilla.org/show_bug.cgi?id=629607).  This is
+	 * apparently no longer the preferred way of implementing console.
+	 * When Proxy is enabled, whitelist at least .toJSON() to avoid
+	 * confusing JX serialization of the console object.
+	 */
+
+	if (flags & DUK_CONSOLE_PROXY_WRAPPER) {
+		/* Tolerate failure to initialize Proxy wrapper in case
+		 * Proxy support is disabled.
+		 */
+		(void) duk_peval_string_noresult(ctx,
+			"(function(){"
+			    "var D=function(){};"
+			    "var W={toJSON:true};"  /* whitelisted */
+			    "console=new Proxy(console,{"
+			        "get:function(t,k){"
+			            "var v=t[k];"
+			            "return typeof v==='function'||W[k]?v:D;"
+			        "}"
+			    "});"
+			"})();"
+		);
+	}
+}

core/src/duktape/duk_console.h

@@ -0,0 +1,29 @@
+#if !defined(DUK_CONSOLE_H_INCLUDED)
+#define DUK_CONSOLE_H_INCLUDED
+
+#include "duktape.h"
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+/* Use a proxy wrapper to make undefined methods (console.foo()) no-ops. */
+#define DUK_CONSOLE_PROXY_WRAPPER  (1U << 0)
+
+/* Flush output after every call. */
+#define DUK_CONSOLE_FLUSH          (1U << 1)
+
+/* Send output to stdout only (default is mixed stdout/stderr). */
+#define DUK_CONSOLE_STDOUT_ONLY    (1U << 2)
+
+/* Send output to stderr only (default is mixed stdout/stderr). */
+#define DUK_CONSOLE_STDERR_ONLY    (1U << 3)
+
+/* Initialize the console system */
+extern void duk_console_init(duk_context *ctx, duk_uint_t flags);
+
+#if defined(__cplusplus)
+}
+#endif  /* end 'extern "C"' wrapper */
+
+#endif  /* DUK_CONSOLE_H_INCLUDED */

core/src/event.h

@@ -0,0 +1,43 @@
+#pragma once
+#include <vector>
+#include <spdlog/spdlog.h>
+
+template <class T>
+class Event {
+public:
+    Event() {}
+    ~Event() {}
+
+    struct EventHandler {
+        EventHandler() {}
+        EventHandler(void (*handler)(T, void*), void* ctx) {
+            this->handler = handler;
+            this->ctx = ctx;
+        }
+
+        void (*handler)(T, void*);
+        void* ctx;
+    };
+
+    void emit(T value) {
+        for (auto const& handler : handlers) {
+            handler.handler(value, handler.ctx);
+        }
+    }
+
+    void bindHandler(const EventHandler& handler) {
+        handlers.push_back(handler);
+    }
+
+    void unbindHandler(const EventHandler& handler) {
+        if (handlers.find(handler) == handlers.end()) {
+            spdlog::error("Tried to remove a non-existant event handler");
+            return;
+        }
+        handlers.erase(std::remove(handlers.begin(), handlers.end(), handler), handlers.end());
+    }
+
+private:
+    std::vector<EventHandler> handlers;
+
+};

core/src/gui/dialogs/credits.cpp

@@ -0,0 +1,59 @@
+#include <gui/dialogs/credits.h>
+#include <imgui.h>
+#include <gui/icons.h>
+#include <gui/style.h>
+#include <config.h>
+
+namespace credits {
+    ImFont* bigFont;
+
+    void init() {
+                
+    }
+
+    void show() {
+        ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(20.0f, 20.0f));
+        ImGui::OpenPopup("Credits");
+        ImGui::BeginPopupModal("Credits", NULL, ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoMove);
+
+        ImGui::PushFont(style::hugeFont);
+        ImGui::Text("SDR++    ");
+        ImGui::PopFont();
+        ImGui::SameLine();
+        ImGui::Image(icons::LOGO, ImVec2(128, 128));
+        ImGui::Spacing();
+        ImGui::Spacing();
+        ImGui::Spacing();
+
+        ImGui::Text("This software is brought to you by\n\n");
+
+        ImGui::Columns(3, "CreditColumns", true);
+
+        // Contributors
+        ImGui::Text("Contributors");
+        ImGui::BulletText("Ryzerth (Creator)");
+        ImGui::BulletText("aosync");
+        ImGui::BulletText("Benjamin Kyd");
+        ImGui::BulletText("Tobias Mädel");
+        ImGui::BulletText("Raov");
+        ImGui::BulletText("Howard0su");
+
+        // Libraries
+        ImGui::NextColumn();
+        ImGui::Text("Libraries");
+        ImGui::BulletText("SoapySDR (PothosWare)");
+        ImGui::BulletText("Dear ImGui (ocornut)");
+        ImGui::BulletText("spdlog (gabime)");
+        ImGui::BulletText("json (nlohmann)");
+        ImGui::BulletText("portaudio (PA Comm.)");
+
+        // Patrons
+        ImGui::NextColumn();
+        ImGui::Text("Patrons");
+        ImGui::BulletText("SignalsEverywhere");
+        ImGui::BulletText("Lee Donaghy");
+
+        ImGui::EndPopup();
+        ImGui::PopStyleVar(1);
+    }
+}

core/src/gui/dialogs/credits.h

@@ -0,0 +1,6 @@
+#pragma once
+
+namespace credits {
+    void init();
+    void show();
+}

core/src/gui/dialogs/loading_screen.cpp

@@ -0,0 +1,91 @@
+#include <GL/glew.h>
+#include <gui/dialogs/loading_screen.h>
+#include <gui/main_window.h>
+#include <imgui.h>
+#include "imgui_impl_glfw.h"
+#include "imgui_impl_opengl3.h"
+#include <gui/icons.h>
+#include <gui/style.h>
+
+namespace LoadingScreen {
+    GLFWwindow* _win;
+
+    void setWindow(GLFWwindow* win) {
+        _win = win;
+    }
+
+    void show(std::string msg) {
+        glfwPollEvents();
+        ImGui_ImplOpenGL3_NewFrame();
+        ImGui_ImplGlfw_NewFrame();
+
+        ImGui::NewFrame();
+        ImGui::Begin("Main", NULL, WINDOW_FLAGS);
+
+
+        ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(20.0f, 20.0f));
+        ImGui::OpenPopup("Credits");
+        ImGui::PushStyleColor(ImGuiCol_ModalWindowDarkening, ImVec4(0.0f, 0.0f, 0.0f, 0.0f));
+        ImGui::BeginPopupModal("Credits", NULL, ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoBackground);
+
+        ImGui::PushFont(style::hugeFont);
+        ImGui::Text("SDR++    ");
+        ImGui::PopFont();
+        ImGui::SameLine();
+        ImGui::Image(icons::LOGO, ImVec2(128, 128));
+        ImGui::Spacing();
+        ImGui::Spacing();
+        ImGui::Spacing();
+
+        ImGui::Text("This software is brought to you by\n\n");
+
+        ImGui::Columns(3, "CreditColumns", true);
+
+        // Contributors
+        ImGui::Text("Contributors");
+        ImGui::BulletText("Ryzerth (Creator)");
+        ImGui::BulletText("aosync");
+        ImGui::BulletText("Benjamin Kyd");
+        ImGui::BulletText("Tobias Mädel");
+        ImGui::BulletText("Raov");
+        ImGui::BulletText("Howard0su");
+
+        // Libraries
+        ImGui::NextColumn();
+        ImGui::Text("Libraries");
+        ImGui::BulletText("SoapySDR (PothosWare)");
+        ImGui::BulletText("Dear ImGui (ocornut)");
+        ImGui::BulletText("spdlog (gabime)");
+        ImGui::BulletText("json (nlohmann)");
+        ImGui::BulletText("portaudio (PA Comm.)");
+
+        // Patrons
+        ImGui::NextColumn();
+        ImGui::Text("Patrons");
+        ImGui::BulletText("SignalsEverywhere");
+        ImGui::BulletText("Lee Donaghy");
+
+        ImGui::Columns(1, "CreditColumnsEnd", true);
+
+        ImGui::Spacing();
+        ImGui::Spacing();
+        ImGui::Spacing();
+        ImGui::Text(msg.c_str());
+
+        ImGui::EndPopup();
+        ImGui::PopStyleVar(1);
+        ImGui::PopStyleColor(1);
+
+        ImGui::End();
+
+        ImGui::Render();
+        int display_w, display_h;
+        glfwGetFramebufferSize(_win, &display_w, &display_h);
+        glViewport(0, 0, display_w, display_h);
+        glClearColor(0.0666f, 0.0666f, 0.0666f, 1.0f);
+        glClear(GL_COLOR_BUFFER_BIT);
+        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+
+        glfwSwapBuffers(_win);
+    }
+}

core/src/gui/dialogs/loading_screen.h

@@ -0,0 +1,10 @@
+#pragma once
+#include <thread>
+#include <string>
+#include <mutex>
+#include <GLFW/glfw3.h>
+
+namespace LoadingScreen {
+    void setWindow(GLFWwindow* win);
+    void show(std::string msg);
+};

core/src/gui/gui.cpp

@@ -0,0 +1,7 @@
+#include <gui/gui.h>
+
+namespace gui {
+    ImGui::WaterFall waterfall;
+    FrequencySelect freqSelect;
+    Menu menu;
+};

core/src/gui/gui.h

@@ -0,0 +1,14 @@
+#pragma once
+#include <gui/widgets/waterfall.h>
+#include <gui/widgets/frequency_select.h>
+#include <gui/widgets/menu.h>
+#include <gui/dialogs/loading_screen.h>
+#include <new_module.h>
+
+namespace gui {
+    SDRPP_EXPORT ImGui::WaterFall waterfall;
+    SDRPP_EXPORT FrequencySelect freqSelect;
+    SDRPP_EXPORT Menu menu;
+
+    void selectSource(std::string name);
+};

core/src/gui/icons.cpp

@@ -0,0 +1,43 @@
+#include <gui/icons.h>
+#include <stdint.h>
+#include <GL/glew.h>
+#include <config.h>
+
+#define STB_IMAGE_IMPLEMENTATION
+#include <imgui/stb_image.h>
+
+namespace icons {
+    ImTextureID LOGO;
+    ImTextureID PLAY;
+    ImTextureID STOP;
+    ImTextureID MENU;
+    ImTextureID MUTED;
+    ImTextureID UNMUTED;
+    ImTextureID NORMAL_TUNING;
+    ImTextureID CENTER_TUNING;
+
+    GLuint loadTexture(std::string path) {
+        int w,h,n;
+        stbi_uc* data = stbi_load(path.c_str(), &w, &h, &n, 0);
+        GLuint texId;
+        glGenTextures(1, &texId);
+        glBindTexture(GL_TEXTURE_2D, texId);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+        glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, (uint8_t*)data);
+        stbi_image_free(data);
+        return texId;
+    }
+
+    void load() {
+        LOGO = (ImTextureID)(uintptr_t)loadTexture(ROOT_DIR "/res/icons/sdrpp.png");
+        PLAY = (ImTextureID)(uintptr_t)loadTexture(ROOT_DIR "/res/icons/play.png");
+        STOP = (ImTextureID)(uintptr_t)loadTexture(ROOT_DIR "/res/icons/stop.png");
+        MENU = (ImTextureID)(uintptr_t)loadTexture(ROOT_DIR "/res/icons/menu.png");
+        MUTED = (ImTextureID)(uintptr_t)loadTexture(ROOT_DIR "/res/icons/muted.png");
+        UNMUTED = (ImTextureID)(uintptr_t)loadTexture(ROOT_DIR "/res/icons/unmuted.png");
+        NORMAL_TUNING = (ImTextureID)(uintptr_t)loadTexture(ROOT_DIR "/res/icons/normal_tuning.png");
+        CENTER_TUNING = (ImTextureID)(uintptr_t)loadTexture(ROOT_DIR "/res/icons/center_tuning.png");
+    }
+}

core/src/gui/icons.h

@@ -0,0 +1,18 @@
+#pragma once
+#include <imgui/imgui.h>
+#include <GL/glew.h>
+#include <string>
+
+namespace icons {
+    extern ImTextureID LOGO;
+    extern ImTextureID PLAY;
+    extern ImTextureID STOP;
+    extern ImTextureID MENU;
+    extern ImTextureID MUTED;
+    extern ImTextureID UNMUTED;
+    extern ImTextureID NORMAL_TUNING;
+    extern ImTextureID CENTER_TUNING;
+
+    GLuint loadTexture(std::string path);
+    void load();
+}

core/src/gui/main_window.cpp

@@ -0,0 +1,612 @@
+#include <gui/main_window.h>
+#include <gui/gui.h>
+#include "imgui.h"
+#include "imgui_impl_glfw.h"
+#include "imgui_impl_opengl3.h"
+#include <stdio.h>
+#include <GL/glew.h>
+#include <GLFW/glfw3.h>
+#include <imgui_plot.h>
+#include <thread>
+#include <complex>
+#include <gui/widgets/waterfall.h>
+#include <gui/widgets/frequency_select.h>
+#include <fftw3.h>
+#include <signal_path/dsp.h>
+#include <gui/icons.h>
+#include <gui/widgets/bandplan.h>
+#include <watcher.h>
+#include <signal_path/vfo_manager.h>
+#include <gui/style.h>
+#include <config.h>
+#include <signal_path/signal_path.h>
+#include <core.h>
+#include <gui/menus/source.h>
+#include <gui/menus/display.h>
+#include <gui/menus/bandplan.h>
+#include <gui/menus/sink.h>
+#include <gui/menus/scripting.h>
+#include <gui/dialogs/credits.h>
+#include <filesystem>
+#include <signal_path/source.h>
+#include <gui/dialogs/loading_screen.h>
+
+// const int FFTSizes[] = {
+//     65536,
+//     32768,
+//     16384,
+//     8192,
+//     4096,
+//     2048
+// };
+
+// const char* FFTSizesStr[] = {
+//     "65536",
+//     "32768",
+//     "16384",
+//     "8192",
+//     "4096",
+//     "2048"
+// };
+
+// int fftSizeId = 0;
+int fftSize = 8192 * 8;
+
+std::thread worker;
+std::mutex fft_mtx;
+fftwf_complex *fft_in, *fft_out;
+fftwf_plan p;
+float* tempFFT;
+float* FFTdata;
+char buf[1024];
+
+
+
+void fftHandler(dsp::complex_t* samples, int count, void* ctx) {
+    memcpy(fft_in, samples, count * sizeof(dsp::complex_t));
+    fftwf_execute(p);
+    int half = count / 2;
+
+    volk_32fc_s32f_power_spectrum_32f(tempFFT, (lv_32fc_t*)fft_out, count, count);
+    volk_32f_s32f_multiply_32f(FFTdata, tempFFT, 0.5f, count);
+
+    memcpy(tempFFT, &FFTdata[half], half * sizeof(float));
+    memmove(&FFTdata[half], FFTdata, half * sizeof(float));
+    memcpy(FFTdata, tempFFT, half * sizeof(float));
+
+    float* fftBuf = gui::waterfall.getFFTBuffer();
+    if (fftBuf == NULL) {
+        gui::waterfall.pushFFT();
+        return;
+    }
+    float last = FFTdata[0];
+    for (int i = 0; i < count; i++) {
+        last = (FFTdata[i] * 0.1f) + (last * 0.9f);
+        fftBuf[i] = last;
+    }
+    gui::waterfall.pushFFT();
+}
+
+watcher<uint64_t> freq((uint64_t)90500000);
+watcher<double> vfoFreq(92000000.0);
+float fftMin = -70.0;
+float fftMax = 0.0;
+watcher<double> offset(0.0, true);
+float bw = 8000000;
+bool playing = false;
+watcher<bool> dcbias(false, false);
+bool showCredits = false;
+std::string audioStreamName = "";
+std::string sourceName = "";
+int menuWidth = 300;
+bool grabbingMenu = false;
+int newWidth = 300;
+int fftHeight = 300;
+bool showMenu = true;
+bool centerTuning = false;
+dsp::stream<dsp::complex_t> dummyStream;
+bool demoWindow = false;
+
+void windowInit() {
+    LoadingScreen::show("Initializing UI");
+    gui::waterfall.init();
+    gui::waterfall.setRawFFTSize(fftSize);
+
+    tempFFT = new float[fftSize];
+    FFTdata = new float[fftSize];
+
+    credits::init();
+
+    core::configManager.aquire();
+    gui::menu.order = core::configManager.conf["menuOrder"].get<std::vector<std::string>>();
+    core::configManager.release();
+
+    gui::menu.registerEntry("Source", sourecmenu::draw, NULL);
+    gui::menu.registerEntry("Sinks", sinkmenu::draw, NULL);
+    gui::menu.registerEntry("Scripting", scriptingmenu::draw, NULL);
+    gui::menu.registerEntry("Band Plan", bandplanmenu::draw, NULL);
+    gui::menu.registerEntry("Display", displaymenu::draw, NULL);
+    
+    gui::freqSelect.init();
+
+    // Set default values for waterfall in case no source init's it
+    gui::waterfall.setBandwidth(8000000);
+    gui::waterfall.setViewBandwidth(8000000);
+    
+    fft_in = (fftwf_complex*) fftwf_malloc(sizeof(fftwf_complex) * fftSize);
+    fft_out = (fftwf_complex*) fftwf_malloc(sizeof(fftwf_complex) * fftSize);
+    p = fftwf_plan_dft_1d(fftSize, fft_in, fft_out, FFTW_FORWARD, FFTW_ESTIMATE);
+
+    sigpath::signalPath.init(8000000, 20, fftSize, &dummyStream, (dsp::complex_t*)fft_in, fftHandler);
+    sigpath::signalPath.start();
+
+    spdlog::info("Loading modules");
+
+    // Load modules from /module directory
+    if (std::filesystem::is_directory(ROOT_DIR "/modules")) {
+        for (const auto & file : std::filesystem::directory_iterator(ROOT_DIR "/modules")) {
+            std::string path = file.path().generic_string();
+            if (file.path().extension().generic_string() != SDRPP_MOD_EXTENTSION) {
+                continue;
+            }
+            if (!file.is_regular_file()) { continue; }
+            spdlog::info("Loading {0}", path);
+            LoadingScreen::show("Loading " + path);
+            core::moduleManager.loadModule(path);
+        }
+    }
+    else {
+        spdlog::warn("Module directory {0} does not exist, not loading modules from directory");
+    }
+
+    // Read module config
+    core::configManager.aquire();
+    std::vector<std::string> modules = core::configManager.conf["modules"];
+    std::map<std::string, std::string> modList = core::configManager.conf["moduleInstances"];
+    core::configManager.release();
+
+    // Load additional modules specified through config
+    for (auto const& path : modules) {
+        spdlog::info("Loading {0}", path);
+        LoadingScreen::show("Loading " + path);
+        core::moduleManager.loadModule(path);
+    }
+
+    // Create module instances
+    for (auto const& [name, module] : modList) {
+        spdlog::info("Initializing {0} ({1})", name, module);
+        LoadingScreen::show("Initializing " + name + " (" + module + ")");
+        core::moduleManager.createInstance(name, module);
+    }
+
+    sourecmenu::init();
+    sinkmenu::init();
+    scriptingmenu::init();
+    bandplanmenu::init();
+    displaymenu::init();
+
+    // TODO for 0.2.5
+    // Add "select file" option for the file source
+    // Have a good directory system on both linux and windows
+    // Switch to double buffering (should fix occassional underruns)
+    // Fix gain not updated on startup, soapysdr
+
+    // TODO for 0.2.6
+    // Add a module add/remove/change order menu
+
+    // Update UI settings
+    LoadingScreen::show("Loading configuration");
+    core::configManager.aquire();
+    fftMin = core::configManager.conf["min"];
+    fftMax = core::configManager.conf["max"];
+    gui::waterfall.setFFTMin(fftMin);
+    gui::waterfall.setWaterfallMin(fftMin);
+    gui::waterfall.setFFTMax(fftMax);
+    gui::waterfall.setWaterfallMax(fftMax);
+
+    double frequency = core::configManager.conf["frequency"];
+
+    gui::freqSelect.setFrequency(frequency);
+    gui::freqSelect.frequencyChanged = false;
+    sigpath::sourceManager.tune(frequency);
+    gui::waterfall.setCenterFrequency(frequency);
+    bw = gui::waterfall.getBandwidth();
+    gui::waterfall.vfoFreqChanged = false;
+    gui::waterfall.centerFreqMoved = false;
+    gui::waterfall.selectFirstVFO();
+
+    menuWidth = core::configManager.conf["menuWidth"];
+    newWidth = menuWidth;
+
+    fftHeight = core::configManager.conf["fftHeight"];
+    gui::waterfall.setFFTHeight(fftHeight);
+
+    centerTuning = core::configManager.conf["centerTuning"];
+
+    core::configManager.release();
+}
+
+void setVFO(double freq) {
+    double viewBW = gui::waterfall.getViewBandwidth();
+    double BW = gui::waterfall.getBandwidth();
+    if (gui::waterfall.selectedVFO == "") {
+        gui::waterfall.setViewOffset((BW / 2.0) - (viewBW / 2.0));
+        gui::waterfall.setCenterFrequency(freq);
+        sigpath::sourceManager.tune(freq);
+        return;
+    }
+
+    ImGui::WaterfallVFO* vfo = gui::waterfall.vfos[gui::waterfall.selectedVFO];
+
+    double currentOff =  vfo->centerOffset;
+    double currentTune = gui::waterfall.getCenterFrequency() + vfo->generalOffset;
+    double delta = freq - currentTune;
+
+    double newVFO = currentOff + delta;
+    double vfoBW = vfo->bandwidth;
+    double vfoBottom = newVFO - (vfoBW / 2.0);
+    double vfoTop = newVFO + (vfoBW / 2.0);
+
+    double view = gui::waterfall.getViewOffset();
+    double viewBottom = view - (viewBW / 2.0);
+    double viewTop = view + (viewBW / 2.0);
+
+    double wholeFreq = gui::waterfall.getCenterFrequency();
+    double bottom = -(BW / 2.0);
+    double top = (BW / 2.0);
+
+    if (centerTuning) {
+        gui::waterfall.setViewOffset((BW / 2.0) - (viewBW / 2.0));
+        gui::waterfall.setCenterFrequency(freq);
+        gui::waterfall.setViewOffset(0);
+        sigpath::vfoManager.setOffset(gui::waterfall.selectedVFO, 0);
+        sigpath::sourceManager.tune(freq);
+        return;
+    }
+
+    // VFO still fints in the view
+    if (vfoBottom > viewBottom && vfoTop < viewTop) {
+        sigpath::vfoManager.setCenterOffset(gui::waterfall.selectedVFO, newVFO);
+        return;
+    }
+
+    // VFO too low for current SDR tuning
+    if (vfoBottom < bottom) {
+        gui::waterfall.setViewOffset((BW / 2.0) - (viewBW / 2.0));
+        double newVFOOffset = (BW / 2.0) - (vfoBW / 2.0) - (viewBW / 10.0);
+        sigpath::vfoManager.setCenterOffset(gui::waterfall.selectedVFO, newVFOOffset);
+        gui::waterfall.setCenterFrequency(freq - newVFOOffset);
+        sigpath::sourceManager.tune(freq - newVFOOffset);
+        return;
+    }
+
+    // VFO too high for current SDR tuning
+    if (vfoTop > top) {
+        gui::waterfall.setViewOffset((viewBW / 2.0) - (BW / 2.0));
+        double newVFOOffset = (vfoBW / 2.0) - (BW / 2.0) + (viewBW / 10.0);
+        sigpath::vfoManager.setCenterOffset(gui::waterfall.selectedVFO, newVFOOffset);
+        gui::waterfall.setCenterFrequency(freq - newVFOOffset);
+        sigpath::sourceManager.tune(freq - newVFOOffset);
+        return;
+    }
+
+    // VFO is still without the SDR's bandwidth
+    if (delta < 0) {
+        double newViewOff = vfoTop - (viewBW / 2.0) + (viewBW / 10.0);
+        double newViewBottom = newViewOff - (viewBW / 2.0);
+        double newViewTop = newViewOff + (viewBW / 2.0);
+
+        if (newViewBottom > bottom) {
+            gui::waterfall.setViewOffset(newViewOff);
+            sigpath::vfoManager.setCenterOffset(gui::waterfall.selectedVFO, newVFO);
+            return;
+        }
+
+        gui::waterfall.setViewOffset((BW / 2.0) - (viewBW / 2.0));
+        double newVFOOffset = (BW / 2.0) - (vfoBW / 2.0) - (viewBW / 10.0);
+        sigpath::vfoManager.setCenterOffset(gui::waterfall.selectedVFO, newVFOOffset);
+        gui::waterfall.setCenterFrequency(freq - newVFOOffset);
+        sigpath::sourceManager.tune(freq - newVFOOffset);
+    }
+    else {
+        double newViewOff = vfoBottom + (viewBW / 2.0) - (viewBW / 10.0);
+        double newViewBottom = newViewOff - (viewBW / 2.0);
+        double newViewTop = newViewOff + (viewBW / 2.0);
+
+        if (newViewTop < top) {
+            gui::waterfall.setViewOffset(newViewOff);
+            sigpath::vfoManager.setCenterOffset(gui::waterfall.selectedVFO, newVFO);
+            return;
+        }
+
+        gui::waterfall.setViewOffset((viewBW / 2.0) - (BW / 2.0));
+        double newVFOOffset = (vfoBW / 2.0) - (BW / 2.0) + (viewBW / 10.0);
+        sigpath::vfoManager.setCenterOffset(gui::waterfall.selectedVFO, newVFOOffset);
+        gui::waterfall.setCenterFrequency(freq - newVFOOffset);
+        sigpath::sourceManager.tune(freq - newVFOOffset);
+    }
+}
+
+void drawWindow() {
+    ImGui::Begin("Main", NULL, WINDOW_FLAGS);
+
+    ImGui::WaterfallVFO* vfo = NULL;
+    if (gui::waterfall.selectedVFO != "") {
+        vfo = gui::waterfall.vfos[gui::waterfall.selectedVFO];
+    }
+
+    if (vfo != NULL) {
+        if (vfo->centerOffsetChanged) {
+            if (centerTuning) {
+                setVFO(gui::waterfall.getCenterFrequency() + vfo->generalOffset);
+            }
+            gui::freqSelect.setFrequency(gui::waterfall.getCenterFrequency() + vfo->generalOffset);
+            gui::freqSelect.frequencyChanged = false;
+            core::configManager.aquire();
+            core::configManager.conf["frequency"] = gui::freqSelect.frequency;
+            core::configManager.release(true);
+        }
+    }
+    
+    sigpath::vfoManager.updateFromWaterfall(&gui::waterfall);
+
+    if (gui::waterfall.selectedVFOChanged && vfo != NULL) {
+        gui::waterfall.selectedVFOChanged = false;
+        gui::freqSelect.setFrequency(vfo->generalOffset + gui::waterfall.getCenterFrequency());
+        gui::freqSelect.frequencyChanged = false;
+        core::configManager.aquire();
+        core::configManager.conf["frequency"] = gui::freqSelect.frequency;
+        core::configManager.release(true);
+    }
+
+    if (gui::freqSelect.frequencyChanged) {
+        gui::freqSelect.frequencyChanged = false;
+        setVFO(gui::freqSelect.frequency);
+        if (vfo != NULL) {
+            vfo->centerOffsetChanged = false;
+            vfo->lowerOffsetChanged = false;
+            vfo->upperOffsetChanged = false;
+        }
+        core::configManager.aquire();
+        core::configManager.conf["frequency"] = gui::freqSelect.frequency;
+        core::configManager.release(true);
+    }
+
+    if (gui::waterfall.centerFreqMoved) {
+        gui::waterfall.centerFreqMoved = false;
+        sigpath::sourceManager.tune(gui::waterfall.getCenterFrequency());
+        if (vfo != NULL) {
+            gui::freqSelect.setFrequency(gui::waterfall.getCenterFrequency() + vfo->generalOffset);
+        }
+        else {
+            gui::freqSelect.setFrequency(gui::waterfall.getCenterFrequency());
+        }
+        core::configManager.aquire();
+        core::configManager.conf["frequency"] = gui::freqSelect.frequency;
+        core::configManager.release(true);
+    }
+
+    int _fftHeight = gui::waterfall.getFFTHeight();
+    if (fftHeight != _fftHeight) {
+        fftHeight = _fftHeight;
+        core::configManager.aquire();
+        core::configManager.conf["fftHeight"] = fftHeight;
+        core::configManager.release(true);
+    }
+
+    ImVec2 vMin = ImGui::GetWindowContentRegionMin();
+    ImVec2 vMax = ImGui::GetWindowContentRegionMax();
+
+    int width = vMax.x - vMin.x;
+    int height = vMax.y - vMin.y;
+
+    // To Bar
+    ImGui::PushID(ImGui::GetID("sdrpp_menu_btn"));
+    if (ImGui::ImageButton(icons::MENU, ImVec2(30, 30), ImVec2(0, 0), ImVec2(1, 1), 5)) {
+        showMenu = !showMenu;
+    }
+    ImGui::PopID();
+
+    ImGui::SameLine();
+
+    if (playing) {
+        ImGui::PushID(ImGui::GetID("sdrpp_stop_btn"));
+        if (ImGui::ImageButton(icons::STOP, ImVec2(30, 30), ImVec2(0, 0), ImVec2(1, 1), 5)) {
+            sigpath::sourceManager.stop();
+            playing = false;
+        }
+        ImGui::PopID();
+    }
+    else { // TODO: Might need to check if there even is a device
+        ImGui::PushID(ImGui::GetID("sdrpp_play_btn"));
+        if (ImGui::ImageButton(icons::PLAY, ImVec2(30, 30), ImVec2(0, 0), ImVec2(1, 1), 5)) {
+            sigpath::sourceManager.start();
+            // TODO: tune in module instead
+            sigpath::sourceManager.tune(gui::waterfall.getCenterFrequency());
+            playing = true;
+        }
+        ImGui::PopID();
+    }
+
+    ImGui::SameLine();
+
+    //ImGui::SetCursorPosY(ImGui::GetCursorPosY() + 8);
+    sigpath::sinkManager.showVolumeSlider(gui::waterfall.selectedVFO, "##_sdrpp_main_volume_", 248, 30, 5, true);
+
+    ImGui::SameLine();
+
+    gui::freqSelect.draw();
+
+    //ImGui::SameLine();
+
+    ImGui::SetCursorPosY(ImGui::GetCursorPosY() - 9);
+    if (centerTuning) {
+        ImGui::PushID(ImGui::GetID("sdrpp_ena_st_btn"));
+        if (ImGui::ImageButton(icons::CENTER_TUNING, ImVec2(30, 30), ImVec2(0, 0), ImVec2(1, 1), 5)) {
+            centerTuning = false;
+            core::configManager.aquire();
+            core::configManager.conf["centerTuning"] = centerTuning;
+            core::configManager.release(true);
+        }
+        ImGui::PopID();
+    }
+    else { // TODO: Might need to check if there even is a device
+        ImGui::PushID(ImGui::GetID("sdrpp_dis_st_btn"));
+        if (ImGui::ImageButton(icons::NORMAL_TUNING, ImVec2(30, 30), ImVec2(0, 0), ImVec2(1, 1), 5)) {
+            centerTuning = true;
+            setVFO(gui::freqSelect.frequency);
+            core::configManager.aquire();
+            core::configManager.conf["centerTuning"] = centerTuning;
+            core::configManager.release(true);
+        }
+        ImGui::PopID();
+    }
+
+    ImGui::SameLine();
+
+    // Logo button
+    ImGui::SetCursorPosX(ImGui::GetWindowSize().x - 48);
+    ImGui::SetCursorPosY(10);
+    if (ImGui::ImageButton(icons::LOGO, ImVec2(32, 32), ImVec2(0, 0), ImVec2(1, 1), 0)) {
+        showCredits = true;
+    }
+    if (ImGui::IsMouseDown(ImGuiMouseButton_Left)) {
+        showCredits = false;
+    }
+    if (ImGui::IsKeyPressed(GLFW_KEY_ESCAPE)) {
+        showCredits = false;
+    }
+
+    // Handle menu resize
+    float curY = ImGui::GetCursorPosY();
+    ImVec2 winSize = ImGui::GetWindowSize();
+    ImVec2 mousePos = ImGui::GetMousePos();
+    bool click = ImGui::IsMouseClicked(ImGuiMouseButton_Left);
+    bool down = ImGui::IsMouseDown(ImGuiMouseButton_Left);
+    if (grabbingMenu) {
+        newWidth = mousePos.x;
+        newWidth = std::clamp<float>(newWidth, 250, winSize.x - 250);
+        ImGui::GetForegroundDrawList()->AddLine(ImVec2(newWidth, curY), ImVec2(newWidth, winSize.y - 10), ImGui::GetColorU32(ImGuiCol_SeparatorActive));
+    }
+    if (mousePos.x >= newWidth - 2 && mousePos.x <= newWidth + 2 && mousePos.y > curY) {
+        ImGui::SetMouseCursor(ImGuiMouseCursor_ResizeEW);
+        if (click) {
+            grabbingMenu = true;
+        }
+    }
+    else {
+        ImGui::SetMouseCursor(ImGuiMouseCursor_Arrow);
+    }
+    if(!down && grabbingMenu) {
+        grabbingMenu = false;
+        menuWidth = newWidth;
+        core::configManager.aquire();
+        core::configManager.conf["menuWidth"] = menuWidth;
+        core::configManager.release(true);
+    }
+
+    // Left Column
+
+    if (showMenu) {
+        ImGui::Columns(3, "WindowColumns", false);
+        ImGui::SetColumnWidth(0, menuWidth);
+        ImGui::SetColumnWidth(1, winSize.x - menuWidth - 60);
+        ImGui::SetColumnWidth(2, 60);
+        ImGui::BeginChild("Left Column");
+        float menuColumnWidth = ImGui::GetContentRegionAvailWidth();
+
+        gui::menu.draw();
+
+        if(ImGui::CollapsingHeader("Debug")) {
+            ImGui::Text("Frame time: %.3f ms/frame", 1000.0 / ImGui::GetIO().Framerate);
+            ImGui::Text("Framerate: %.1f FPS", ImGui::GetIO().Framerate);
+            ImGui::Text("Center Frequency: %.0f Hz", gui::waterfall.getCenterFrequency());
+            ImGui::Text("Source name: %s", sourceName.c_str());
+            if (ImGui::Checkbox("Test technique", &dcbias.val)) {
+                //sigpath::signalPath.setDCBiasCorrection(dcbias.val);
+            }
+            ImGui::Checkbox("Show demo window", &demoWindow);
+            ImGui::Spacing();
+        }
+
+        ImGui::EndChild();
+    }
+    else {
+        // When hiding the menu bar
+        ImGui::Columns(3, "WindowColumns", false);
+        ImGui::SetColumnWidth(0, 8);
+        ImGui::SetColumnWidth(1, winSize.x - 8 - 60);
+        ImGui::SetColumnWidth(2, 60);
+    }
+
+    // Right Column
+    ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(0, 0));
+    ImGui::NextColumn();
+    ImGui::PopStyleVar();
+
+    ImGui::BeginChild("Waterfall");
+
+    gui::waterfall.draw();    
+
+    ImGui::EndChild();
+
+    
+    ImGui::NextColumn();
+    ImGui::BeginChild("WaterfallControls");
+
+    ImGui::SetCursorPosX((ImGui::GetWindowSize().x / 2.0) - (ImGui::CalcTextSize("Zoom").x / 2.0));
+    ImGui::Text("Zoom");
+    ImGui::SetCursorPosX((ImGui::GetWindowSize().x / 2.0) - 10);
+    if (ImGui::VSliderFloat("##_7_", ImVec2(20.0, 150.0), &bw, gui::waterfall.getBandwidth(), 1000.0, "")) {
+        gui::waterfall.setViewBandwidth(bw);
+        if (vfo != NULL) {
+            gui::waterfall.setViewOffset(vfo->centerOffset); // center vfo on screen
+        }
+    }
+
+    ImGui::NewLine();
+
+    ImGui::SetCursorPosX((ImGui::GetWindowSize().x / 2.0) - (ImGui::CalcTextSize("Max").x / 2.0));
+    ImGui::Text("Max");
+    ImGui::SetCursorPosX((ImGui::GetWindowSize().x / 2.0) - 10);
+    if (ImGui::VSliderFloat("##_8_", ImVec2(20.0, 150.0), &fftMax, 0.0, -100.0, "")) {
+        fftMax = std::max<float>(fftMax, fftMin + 10);
+        core::configManager.aquire();
+        core::configManager.conf["max"] = fftMax;
+        core::configManager.release(true);
+    }
+
+    ImGui::NewLine();
+
+    ImGui::SetCursorPosX((ImGui::GetWindowSize().x / 2.0) - (ImGui::CalcTextSize("Min").x / 2.0));
+    ImGui::Text("Min");
+    ImGui::SetCursorPosX((ImGui::GetWindowSize().x / 2.0) - 10);
+    if (ImGui::VSliderFloat("##_9_", ImVec2(20.0, 150.0), &fftMin, 0.0, -100.0, "")) {
+        fftMin = std::min<float>(fftMax - 10, fftMin);
+        core::configManager.aquire();
+        core::configManager.conf["min"] = fftMin;
+        core::configManager.release(true);
+    }
+
+    ImGui::EndChild();
+
+    gui::waterfall.setFFTMin(fftMin);
+    gui::waterfall.setFFTMax(fftMax);
+    gui::waterfall.setWaterfallMin(fftMin);
+    gui::waterfall.setWaterfallMax(fftMax);
+
+
+    ImGui::End();
+
+    if (showCredits) {
+        credits::show();
+    }
+
+    if (demoWindow) {
+        ImGui::ShowDemoWindow();
+    }
+}
+
+void setViewBandwidthSlider(float bandwidth) {
+    bw = bandwidth;
+}

core/src/gui/main_window.h

@@ -0,0 +1,8 @@
+#pragma once
+#include "imgui.h"
+
+#define WINDOW_FLAGS    ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoBringToFrontOnFocus | ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoBackground
+
+void windowInit();
+void drawWindow();
+void setViewBandwidthSlider(float bandwidth);

core/src/gui/menus/bandplan.cpp

@@ -0,0 +1,51 @@
+#include <gui/menus/bandplan.h>
+#include <gui/widgets/bandplan.h>
+#include <gui/gui.h>
+#include <core.h>
+
+namespace bandplanmenu {
+    int bandplanId;
+    bool bandPlanEnabled;
+
+    void init() {
+        // todo: check if the bandplan wasn't removed
+        if (bandplan::bandplanNames.size() == 0) {
+            gui::waterfall.hideBandplan();
+            return;
+        }
+
+        if (bandplan::bandplans.find(core::configManager.conf["bandPlan"]) != bandplan::bandplans.end()) {
+            std::string name = core::configManager.conf["bandPlan"];
+            bandplanId = std::distance(bandplan::bandplanNames.begin(), std::find(bandplan::bandplanNames.begin(),
+                                    bandplan::bandplanNames.end(), name));
+            gui::waterfall.bandplan = &bandplan::bandplans[name];
+        }
+        else {
+            gui::waterfall.bandplan = &bandplan::bandplans[bandplan::bandplanNames[0]];
+        }
+
+        bandPlanEnabled = core::configManager.conf["bandPlanEnabled"];
+        bandPlanEnabled ? gui::waterfall.showBandplan() : gui::waterfall.hideBandplan();
+    }
+
+    void draw(void* ctx) {
+        float menuColumnWidth = ImGui::GetContentRegionAvailWidth();
+        ImGui::PushItemWidth(menuColumnWidth);
+        if (ImGui::Combo("##_4_", &bandplanId, bandplan::bandplanNameTxt.c_str())) {
+            gui::waterfall.bandplan = &bandplan::bandplans[bandplan::bandplanNames[bandplanId]];
+            core::configManager.aquire();
+            core::configManager.conf["bandPlan"] = bandplan::bandplanNames[bandplanId];
+            core::configManager.release(true);
+        }
+        ImGui::PopItemWidth();
+        if (ImGui::Checkbox("Enabled", &bandPlanEnabled)) {
+            bandPlanEnabled ? gui::waterfall.showBandplan() : gui::waterfall.hideBandplan();
+            core::configManager.aquire();
+            core::configManager.conf["bandPlanEnabled"] = bandPlanEnabled;
+            core::configManager.release(true);
+        }
+        bandplan::BandPlan_t plan = bandplan::bandplans[bandplan::bandplanNames[bandplanId]];
+        ImGui::Text("Country: %s (%s)", plan.countryName.c_str(), plan.countryCode.c_str());
+        ImGui::Text("Author: %s", plan.authorName.c_str());
+    }
+};

core/src/gui/menus/bandplan.h

@@ -0,0 +1,6 @@
+#pragma once
+
+namespace bandplanmenu {
+    void init();
+    void draw(void* ctx);
+};

core/src/gui/menus/display.cpp

@@ -0,0 +1,22 @@
+#include <gui/menus/display.h>
+#include <imgui.h>
+#include <gui/gui.h>
+#include <core.h>
+
+namespace displaymenu {
+    bool showWaterfall;
+
+    void init() {
+        showWaterfall = core::configManager.conf["showWaterfall"];
+        showWaterfall ? gui::waterfall.showWaterfall() : gui::waterfall.hideWaterfall();
+    }
+
+    void draw(void* ctx) {
+        if (ImGui::Checkbox("Show Waterfall", &showWaterfall)) {
+            showWaterfall ? gui::waterfall.showWaterfall() : gui::waterfall.hideWaterfall();
+            core::configManager.aquire();
+            core::configManager.conf["showWaterfall"] = showWaterfall;
+            core::configManager.release(true);
+        }
+    }
+}

core/src/gui/menus/display.h

@@ -0,0 +1,6 @@
+#pragma once
+
+namespace displaymenu {
+    void init();
+    void draw(void* ctx);
+}

core/src/gui/menus/scripting.cpp

@@ -0,0 +1,22 @@
+#include <gui/menus/scripting.h>
+#include <core.h>
+#include <gui/style.h>
+#include <imgui/imgui.h>
+
+namespace scriptingmenu {
+    void init() {
+
+    }
+
+    void draw(void* ctx) {
+        float menuWidth = ImGui::GetContentRegionAvailWidth();
+        for (const auto& [name, script] : core::scriptManager.scripts) {
+            bool running = script->running;
+            if (running) { style::beginDisabled(); }
+            if (ImGui::Button(name.c_str(), ImVec2(menuWidth, 0))) {
+                script->run();
+            }
+            if (running) { style::endDisabled(); }
+        }
+    }
+}

core/src/gui/menus/scripting.h

@@ -0,0 +1,6 @@
+#pragma once
+
+namespace scriptingmenu {
+    void init();
+    void draw(void* ctx);
+}

core/src/gui/menus/sink.cpp

@@ -0,0 +1,15 @@
+#include <gui/menus/sink.h>
+#include <signal_path/signal_path.h>
+#include <core.h>
+
+namespace sinkmenu {
+    void init() {
+        core::configManager.aquire();
+        sigpath::sinkManager.loadSinksFromConfig();
+        core::configManager.release();
+    }
+
+    void draw(void* ctx) {
+        sigpath::sinkManager.showMenu();
+    }
+};

core/src/gui/menus/sink.h

@@ -0,0 +1,6 @@
+#pragma once
+
+namespace sinkmenu {
+    void init();
+    void draw(void* ctx);
+};

core/src/gui/menus/source.cpp

@@ -0,0 +1,54 @@
+#include <gui/menus/source.h>
+#include <imgui.h>
+#include <gui/gui.h>
+#include <core.h>
+#include <signal_path/signal_path.h>
+
+namespace sourecmenu {
+    int sourceId = 0;
+    double freqOffset = 0.0;
+
+    void init() {
+        core::configManager.aquire();
+        std::string name = core::configManager.conf["source"];
+        auto it = std::find(sigpath::sourceManager.sourceNames.begin(), sigpath::sourceManager.sourceNames.end(), name);
+        if (it != sigpath::sourceManager.sourceNames.end()) {
+            sigpath::sourceManager.selectSource(name);
+            sourceId = std::distance(sigpath::sourceManager.sourceNames.begin(), it);
+        }
+        else if (sigpath::sourceManager.sourceNames.size() > 0) {
+            sigpath::sourceManager.selectSource(sigpath::sourceManager.sourceNames[0]);
+        }
+        else {
+            spdlog::warn("No source available...");
+        }
+        sigpath::sourceManager.setTuningOffset(core::configManager.conf["offset"]);
+        core::configManager.release();
+    }
+
+    void draw(void* ctx) {
+        std::string items = "";
+        for (std::string name : sigpath::sourceManager.sourceNames) {
+            items += name;
+            items += '\0';
+        }
+        float itemWidth = ImGui::GetContentRegionAvailWidth();
+        
+        ImGui::SetNextItemWidth(itemWidth);
+        if (ImGui::Combo("##source", &sourceId, items.c_str())) {
+            sigpath::sourceManager.selectSource(sigpath::sourceManager.sourceNames[sourceId]);
+            core::configManager.aquire();
+            core::configManager.conf["source"] = sigpath::sourceManager.sourceNames[sourceId];
+            core::configManager.release(true);
+        }
+
+        sigpath::sourceManager.showSelectedMenu();
+        ImGui::SetNextItemWidth(itemWidth - ImGui::CalcTextSize("Offset (Hz)").x - 10);
+        if (ImGui::InputDouble("Offset (Hz)##freq_offset", &freqOffset, 1.0, 100.0)) {
+            sigpath::sourceManager.setTuningOffset(freqOffset);
+            core::configManager.aquire();
+            core::configManager.conf["offset"] = freqOffset;
+            core::configManager.release(true);
+        }
+    }
+}

core/src/gui/menus/source.h

@@ -0,0 +1,6 @@
+#pragma once
+
+namespace sourecmenu {
+    void init();
+    void draw(void* ctx);
+}

core/src/gui/style.cpp

@@ -0,0 +1,104 @@
+#include <gui/style.h>
+#include <imgui.h>
+#include <imgui_internal.h>
+#include <config.h>
+
+namespace style {
+    ImFont* baseFont;
+    ImFont* bigFont;
+    ImFont* hugeFont;
+
+    void setDefaultStyle() {
+        ImGui::GetStyle().WindowRounding = 0.0f;
+        ImGui::GetStyle().ChildRounding = 0.0f;
+        ImGui::GetStyle().FrameRounding = 0.0f;
+        ImGui::GetStyle().GrabRounding = 0.0f;
+        ImGui::GetStyle().PopupRounding = 0.0f;
+        ImGui::GetStyle().ScrollbarRounding = 0.0f;
+
+        baseFont = ImGui::GetIO().Fonts->AddFontFromFileTTF(((std::string)(ROOT_DIR "/res/fonts/Roboto-Medium.ttf")).c_str(), 16.0f);
+        bigFont = ImGui::GetIO().Fonts->AddFontFromFileTTF(((std::string)(ROOT_DIR "/res/fonts/Roboto-Medium.ttf")).c_str(), 42.0f);
+        hugeFont = ImGui::GetIO().Fonts->AddFontFromFileTTF(((std::string)(ROOT_DIR "/res/fonts/Roboto-Medium.ttf")).c_str(), 128.0f);
+
+        ImGui::StyleColorsDark();
+        //ImGui::StyleColorsLight();
+    }
+
+    void testtt() {
+        ImGui::StyleColorsLight();
+    }
+
+    void setDarkStyle() {
+        ImGui::GetStyle().WindowRounding = 0.0f;
+        ImGui::GetStyle().ChildRounding = 0.0f;
+        ImGui::GetStyle().FrameRounding = 0.0f;
+        ImGui::GetStyle().GrabRounding = 0.0f;
+        ImGui::GetStyle().PopupRounding = 0.0f;
+        ImGui::GetStyle().ScrollbarRounding = 0.0f;
+
+        baseFont = ImGui::GetIO().Fonts->AddFontFromFileTTF(((std::string)(ROOT_DIR "/res/fonts/Roboto-Medium.ttf")).c_str(), 16.0f);
+        bigFont = ImGui::GetIO().Fonts->AddFontFromFileTTF(((std::string)(ROOT_DIR "/res/fonts/Roboto-Medium.ttf")).c_str(), 42.0f);
+        hugeFont = ImGui::GetIO().Fonts->AddFontFromFileTTF(((std::string)(ROOT_DIR "/res/fonts/Roboto-Medium.ttf")).c_str(), 128.0f);
+
+        ImGui::StyleColorsDark();
+
+        auto& style = ImGui::GetStyle();
+
+        ImVec4* colors = style.Colors;
+
+        colors[ImGuiCol_Text]                   = ImVec4(1.00f, 1.00f, 1.00f, 1.00f);
+        colors[ImGuiCol_TextDisabled]           = ImVec4(0.50f, 0.50f, 0.50f, 1.00f);
+        colors[ImGuiCol_WindowBg]               = ImVec4(0.06f, 0.06f, 0.06f, 0.94f);
+        colors[ImGuiCol_ChildBg]                = ImVec4(1.00f, 1.00f, 1.00f, 0.00f);
+        colors[ImGuiCol_PopupBg]                = ImVec4(0.08f, 0.08f, 0.08f, 0.94f);
+        colors[ImGuiCol_Border]                 = ImVec4(0.43f, 0.43f, 0.50f, 0.50f);
+        colors[ImGuiCol_BorderShadow]           = ImVec4(0.00f, 0.00f, 0.00f, 0.00f);
+        colors[ImGuiCol_FrameBg]                = ImVec4(0.20f, 0.21f, 0.22f, 0.54f);
+        colors[ImGuiCol_FrameBgHovered]         = ImVec4(0.20f, 0.21f, 0.22f, 0.54f);
+        colors[ImGuiCol_FrameBgActive]          = ImVec4(0.20f, 0.21f, 0.22f, 0.54f);
+        colors[ImGuiCol_TitleBg]                = ImVec4(0.04f, 0.04f, 0.04f, 1.00f);
+        colors[ImGuiCol_TitleBgActive]          = ImVec4(0.29f, 0.29f, 0.29f, 1.00f);
+        colors[ImGuiCol_TitleBgCollapsed]       = ImVec4(0.00f, 0.00f, 0.00f, 0.51f);
+        colors[ImGuiCol_MenuBarBg]              = ImVec4(0.14f, 0.14f, 0.14f, 1.00f);
+        colors[ImGuiCol_ScrollbarBg]            = ImVec4(0.02f, 0.02f, 0.02f, 0.53f);
+        colors[ImGuiCol_ScrollbarGrab]          = ImVec4(0.31f, 0.31f, 0.31f, 1.00f);
+        colors[ImGuiCol_ScrollbarGrabHovered]   = ImVec4(0.41f, 0.41f, 0.41f, 1.00f);
+        colors[ImGuiCol_ScrollbarGrabActive]    = ImVec4(0.51f, 0.51f, 0.51f, 1.00f);
+        colors[ImGuiCol_CheckMark]              = ImVec4(0.24f, 0.52f, 0.88f, 1.00f);
+        colors[ImGuiCol_SliderGrab]             = ImVec4(0.24f, 0.52f, 0.88f, 1.00f);
+        colors[ImGuiCol_SliderGrabActive]       = ImVec4(0.26f, 0.59f, 0.98f, 1.00f);
+        colors[ImGuiCol_Button]                 = ImVec4(0.44f, 0.44f, 0.44f, 0.40f);
+        colors[ImGuiCol_ButtonHovered]          = ImVec4(0.44f, 0.44f, 0.44f, 0.45f);
+        colors[ImGuiCol_ButtonActive]           = ImVec4(0.44f, 0.44f, 0.44f, 0.40f);
+        colors[ImGuiCol_Header]                 = ImVec4(0.63f, 0.63f, 0.70f, 0.31f);
+        colors[ImGuiCol_HeaderHovered]          = ImVec4(0.63f, 0.63f, 0.70f, 0.40f);
+        colors[ImGuiCol_HeaderActive]           = ImVec4(0.63f, 0.63f, 0.70f, 0.31f);
+        colors[ImGuiCol_Separator]              = ImVec4(0.43f, 0.43f, 0.50f, 0.50f);
+        colors[ImGuiCol_SeparatorHovered]       = ImVec4(0.72f, 0.72f, 0.72f, 0.78f);
+        colors[ImGuiCol_SeparatorActive]        = ImVec4(0.51f, 0.51f, 0.51f, 1.00f);
+        colors[ImGuiCol_ResizeGrip]             = ImVec4(0.91f, 0.91f, 0.91f, 0.25f);
+        colors[ImGuiCol_ResizeGripHovered]      = ImVec4(0.81f, 0.81f, 0.81f, 0.67f);
+        colors[ImGuiCol_ResizeGripActive]       = ImVec4(0.46f, 0.46f, 0.46f, 0.95f);
+        colors[ImGuiCol_PlotLines]              = ImVec4(0.4f, 0.9f, 1.0f, 1.00f);
+        colors[ImGuiCol_PlotLinesHovered]       = ImVec4(1.00f, 0.43f, 0.35f, 1.00f);
+        colors[ImGuiCol_PlotHistogram]          = ImVec4(0.73f, 0.60f, 0.15f, 1.00f);
+        colors[ImGuiCol_PlotHistogramHovered]   = ImVec4(1.00f, 0.60f, 0.00f, 1.00f);
+        colors[ImGuiCol_TextSelectedBg]         = ImVec4(0.87f, 0.87f, 0.87f, 0.35f);
+        colors[ImGuiCol_ModalWindowDarkening]   = ImVec4(0.80f, 0.80f, 0.80f, 0.35f);
+        colors[ImGuiCol_DragDropTarget]         = ImVec4(1.00f, 1.00f, 0.00f, 0.90f);
+        colors[ImGuiCol_NavHighlight]           = ImVec4(0.60f, 0.60f, 0.60f, 1.00f);
+        colors[ImGuiCol_NavWindowingHighlight]  = ImVec4(1.00f, 1.00f, 1.00f, 0.70f);
+    }
+
+    void beginDisabled() {
+        ImGui::PushItemFlag(ImGuiItemFlags_Disabled, true);
+        ImGui::PushStyleColor(ImGuiCol_Button, ImVec4(0.44f, 0.44f, 0.44f, 0.15f));
+        ImGui::PushStyleColor(ImGuiCol_FrameBg, ImVec4(0.20f, 0.21f, 0.22f, 0.30f));
+        ImGui::PushStyleColor(ImGuiCol_Text, ImVec4(1.00f, 1.00f, 1.00f, 0.65f));
+    }
+
+    void endDisabled() {
+        ImGui::PopItemFlag();
+        ImGui::PopStyleColor(3);
+    }
+}

core/src/gui/style.h

@@ -0,0 +1,14 @@
+#pragma once
+#include <imgui.h>
+
+namespace style {
+    extern ImFont* baseFont;
+    extern ImFont* bigFont;
+    extern ImFont* hugeFont;
+
+    void setDefaultStyle();
+    void setDarkStyle();
+    void beginDisabled();
+    void endDisabled();
+    void testtt();
+}

core/src/gui/widgets/bandplan.cpp

@@ -1,4 +1,9 @@
-#include <bandplan.h>
+#include <gui/widgets/bandplan.h>
+#include <fstream>
+#include <spdlog/spdlog.h>
+#include <filesystem>
+#include <sstream>
+#include <iomanip>
 
 namespace bandplan {
     std::map<std::string, BandPlan_t> bandplans;
@@ -71,7 +76,7 @@ namespace bandplan {
     void loadBandPlan(std::string path) {
         std::ifstream file(path.c_str());
         json data;
-        data << file;
+        file >> data;
         file.close();
 
         BandPlan_t plan = data.get<BandPlan_t>();
@@ -114,7 +119,7 @@ namespace bandplan {
         }
         std::ifstream file(path.c_str());
         json data;
-        data << file;
+        file >> data;
         file.close();
 
         colorTable = data.get<std::map<std::string, BandPlanColor_t>>();

core/src/gui/widgets/bandplan.h

@@ -1,11 +1,7 @@
 #pragma once
 #include <json.hpp>
-#include <fstream>
-#include <spdlog/spdlog.h>
-#include <filesystem>
-#include <sstream>
-#include <iomanip>
 #include <imgui/imgui.h>
+#include <stdint.h>
 
 using nlohmann::json;
 
@@ -13,8 +9,8 @@ namespace bandplan {
     struct Band_t {
         std::string name;
         std::string type;
-        float start;
+        double start;
-        float end;
+        double end;
     };
 
     void to_json(json& j, const Band_t& b);

core/src/gui/widgets/frequency_select.cpp

@@ -1,4 +1,6 @@
-#include <frequency_select.h>
+#include <gui/widgets/frequency_select.h>
+#include <config.h>
+#include <gui/style.h>
 
 bool isInArea(ImVec2 val, ImVec2 min, ImVec2 max) {
     return val.x >= min.x && val.x < max.x && val.y >= min.y && val.y < max.y;
@@ -9,9 +11,9 @@ FrequencySelect::FrequencySelect() {
 }
 
 void FrequencySelect::init() {
-    font = ImGui::GetIO().Fonts->AddFontFromFileTTF("res/fonts/Roboto-Medium.ttf", 42.0f);
     for (int i = 0; i < 12; i++) {
         digits[i] = 0;
+        
     }
 }
 
@@ -67,13 +69,14 @@ void FrequencySelect::draw() {
     window = ImGui::GetCurrentWindow();
     widgetPos = ImGui::GetWindowContentRegionMin();
     widgetEndPos = ImGui::GetWindowContentRegionMax();
-    widgetPos.x += window->Pos.x + 255;
+    ImVec2 cursorPos = ImGui::GetCursorPos();
+    widgetPos.x += window->Pos.x + cursorPos.x;
     widgetPos.y += window->Pos.y - 3;
-    widgetEndPos.x += window->Pos.x + 255;
+    widgetEndPos.x += window->Pos.x + cursorPos.x;
     widgetEndPos.y += window->Pos.y - 3;
     widgetSize = ImVec2(widgetEndPos.x - widgetPos.x, widgetEndPos.y - widgetPos.y);
 
-    ImGui::PushFont(font);
+    ImGui::PushFont(style::bigFont);
 
     if (widgetPos.x != lastWidgetPos.x || widgetPos.y != lastWidgetPos.y) {
         lastWidgetPos = widgetPos;
@@ -84,6 +87,9 @@ void FrequencySelect::draw() {
         onResize();
     }
 
+    ImU32 disabledColor = ImGui::GetColorU32(ImGuiCol_Text, 0.3f);
+    ImU32 textColor = ImGui::GetColorU32(ImGuiCol_Text);
+
     int commaOffset = 0;
     bool zeros = true;
     for (int i = 0; i < 12; i++) {
@@ -92,11 +98,11 @@ void FrequencySelect::draw() {
         }
         sprintf(buf, "%d", digits[i]);
         window->DrawList->AddText(ImVec2(widgetPos.x + (i * 22) + commaOffset, widgetPos.y), 
-                                zeros ? IM_COL32(90, 90, 90, 255) : IM_COL32(255, 255, 255, 255), buf);
+                                zeros ? disabledColor : textColor, buf);
         if ((i + 1) % 3 == 0 && i < 11) {
             commaOffset += 12;
             window->DrawList->AddText(ImVec2(widgetPos.x + (i * 22) + commaOffset + 10, widgetPos.y), 
-                                    zeros ? IM_COL32(90, 90, 90, 255) : IM_COL32(255, 255, 255, 255), ".");
+                                    zeros ? disabledColor : textColor, ".");
         }
     }
 
@@ -138,19 +144,22 @@ void FrequencySelect::draw() {
         }
     }
 
-    long freq = 0;
+    uint64_t freq = 0;
     for (int i = 0; i < 12; i++) {
         freq += digits[i] * pow(10, 11 - i);
     }
     frequency = freq;
 
     ImGui::PopFont();
-    ImGui::NewLine();
+
+    ImGui::SetCursorPosX(digitBottomMaxs[11].x + 17);
+
+    //ImGui::NewLine();
 }
 
-void FrequencySelect::setFrequency(long freq) {
+void FrequencySelect::setFrequency(uint64_t freq) {
     int i = 11;
-    for (long f = freq; i >= 0; i--) {
+    for (uint64_t f = freq; i >= 0; i--) {
         digits[i] = f % 10;
         f -= digits[i];
         f /= 10;

core/src/gui/widgets/frequency_select.h

@@ -1,15 +1,16 @@
 #pragma once
 #include <imgui.h>
 #include <imgui_internal.h>
+#include <stdint.h>
 
 class FrequencySelect {
 public:
     FrequencySelect();
     void init();
     void draw();
-    void setFrequency(long freq);
+    void setFrequency(uint64_t freq);
 
-    long frequency;
+    uint64_t frequency;
     bool frequencyChanged = false;
 
 private:
@@ -26,7 +27,6 @@ private:
     ImVec2 lastWidgetSize;
 
     ImGuiWindow* window;
-    ImFont* font;
 
     int digits[12];
     ImVec2 digitBottomMins[12];

core/src/gui/widgets/menu.cpp

@@ -0,0 +1,77 @@
+#include <gui/widgets/menu.h>
+#include <imgui/imgui.h>
+#include <imgui/imgui_internal.h>
+
+Menu::Menu() {
+
+}
+
+void Menu::registerEntry(std::string name, void (*drawHandler)(void* ctx), void* ctx, ModuleManager::Instance* inst) {
+    MenuItem_t item;
+    item.drawHandler = drawHandler;
+    item.ctx = ctx;
+    item.inst = inst;
+    items[name] = item;
+    if (!isInOrderList(name)) {
+        order.push_back(name);
+    }
+}
+
+void Menu::removeEntry(std::string name) {
+    items.erase(name);
+}
+
+void Menu::draw() {
+    MenuItem_t item;
+    float menuWidth = ImGui::GetContentRegionAvailWidth();
+    ImGuiWindow* window = ImGui::GetCurrentWindow();
+    for (std::string name : order) {
+        if (items.find(name) == items.end()) {
+            continue;
+        }
+        item = items[name];
+
+        ImRect orginalRect = window->WorkRect;
+        if (item.inst != NULL) {
+            
+            window->WorkRect = ImRect(orginalRect.Min, ImVec2(orginalRect.Max.x - ImGui::GetTextLineHeight() - 6, orginalRect.Max.y));
+        }
+
+        if (ImGui::CollapsingHeader(name.c_str(), ImGuiTreeNodeFlags_DefaultOpen)) {
+            if (item.inst != NULL) {
+                window->WorkRect = orginalRect;
+                ImVec2 pos = ImGui::GetCursorPos();
+                ImGui::SetCursorPosX(pos.x + menuWidth - ImGui::GetTextLineHeight() - 6);
+                ImGui::SetCursorPosY(pos.y - 10 - ImGui::GetTextLineHeight());
+                bool enabled = item.inst->isEnabled();
+                if (ImGui::Checkbox(("##_menu_checkbox_" + name).c_str(), &enabled)) {
+                    enabled ? item.inst->enable() : item.inst->disable();
+                }
+                ImGui::SetCursorPos(pos);
+            }
+
+            item.drawHandler(item.ctx);
+            ImGui::Spacing();
+        }
+        else if (item.inst != NULL) {
+            window->WorkRect = orginalRect;
+            ImVec2 pos = ImGui::GetCursorPos();
+            ImGui::SetCursorPosX(pos.x + menuWidth - ImGui::GetTextLineHeight() - 6);
+            ImGui::SetCursorPosY(pos.y - 10 - ImGui::GetTextLineHeight());
+            bool enabled = item.inst->isEnabled();
+            if (ImGui::Checkbox(("##_menu_checkbox_" + name).c_str(), &enabled)) {
+                enabled ? item.inst->enable() : item.inst->disable();
+            }
+            ImGui::SetCursorPos(pos);
+        }
+    }
+}
+
+bool Menu::isInOrderList(std::string name) {
+    for (std::string _name : order) {
+        if (_name == name) {
+            return true;
+        }
+    }
+    return false;
+}

core/src/gui/widgets/menu.h

@@ -0,0 +1,27 @@
+#pragma once
+#include <string>
+#include <vector>
+#include <map>
+#include <new_module.h>
+
+class Menu {
+public:
+    Menu();
+
+    struct MenuItem_t {
+        void (*drawHandler)(void* ctx);
+        void* ctx;
+        ModuleManager::Instance* inst;
+    };
+
+    void registerEntry(std::string name, void (*drawHandler)(void* ctx), void* ctx = NULL, ModuleManager::Instance* inst = NULL);
+    void removeEntry(std::string name);
+    void draw();
+
+    std::vector<std::string> order;
+
+private:
+    bool isInOrderList(std::string name);
+
+    std::map<std::string, MenuItem_t> items;
+};

core/src/gui/widgets/waterfall.cpp

@@ -0,0 +1,872 @@
+#include <gui/widgets/waterfall.h>
+#include <imgui.h>
+#include <imgui_internal.h>
+#include <GL/glew.h>
+#include <imutils.h>
+#include <algorithm>
+
+#include <spdlog/spdlog.h>
+
+float COLOR_MAP[][3] = {
+    {0x00, 0x00, 0x20},
+    {0x00, 0x00, 0x30},
+    {0x00, 0x00, 0x50},
+    {0x00, 0x00, 0x91},
+    {0x1E, 0x90, 0xFF},
+    {0xFF, 0xFF, 0xFF},
+    {0xFF, 0xFF, 0x00},
+    {0xFE, 0x6D, 0x16},
+    {0xFF, 0x00, 0x00},
+    {0xC6, 0x00, 0x00},
+    {0x9F, 0x00, 0x00},
+    {0x75, 0x00, 0x00},
+    {0x4A, 0x00, 0x00}
+};
+
+void doZoom(int offset, int width, int outWidth, float* data, float* out) {
+    // NOTE: REMOVE THAT SHIT, IT'S JUST A HACKY FIX
+    if (offset < 0) {
+        offset = 0;
+    }
+    if (width > 65535) {
+        width = 65535;
+    }
+
+    float factor = (float)width / (float)outWidth;
+    for (int i = 0; i < outWidth; i++) {
+        out[i] = data[(int)(offset + ((float)i * factor))];
+    }
+}
+
+// TODO: Fix this hacky BS
+
+double freq_ranges[] = {
+        1.0, 2.0, 2.5, 5.0,
+        10.0, 20.0, 25.0, 50.0,
+        100.0, 200.0, 250.0, 500.0,
+        1000.0, 2000.0, 2500.0, 5000.0,
+        10000.0, 20000.0, 25000.0, 50000.0,
+        100000.0, 200000.0, 250000.0, 500000.0,
+        1000000.0, 2000000.0, 2500000.0, 5000000.0,
+        10000000.0, 20000000.0, 25000000.0, 50000000.0
+};
+
+double findBestRange(double bandwidth, int maxSteps) {
+    for (int i = 0; i < 32; i++) {
+        if (bandwidth / freq_ranges[i] < (double)maxSteps) {
+            return freq_ranges[i];
+        }
+    }
+    return 50000000.0;
+}
+
+void printAndScale(double freq, char* buf) {
+    if (freq < 1000) {
+        sprintf(buf, "%.3lf", freq);
+    }
+    else if (freq < 1000000) {
+        sprintf(buf, "%.3lfK", freq / 1000.0);
+    }
+    else if (freq < 1000000000) {
+        sprintf(buf, "%.3lfM", freq / 1000000.0);
+    }
+    else if (freq < 1000000000000) {
+        sprintf(buf, "%.3lfG", freq / 1000000000.0);
+    }
+    for (int i = strlen(buf) - 2; i >= 0; i--) {
+        if (buf[i] != '0') {
+            if (buf[i] == '.') {
+                i--;
+            }
+            char scale = buf[strlen(buf) - 1];
+            buf[i + 1] = scale;
+            buf[i + 2] = 0;
+            return;
+        }
+    }
+}
+
+namespace ImGui {
+    WaterFall::WaterFall() {
+        fftMin = -70.0;
+        fftMax = 0.0;
+        waterfallMin = -70.0;
+        waterfallMax = 0.0;
+        FFTAreaHeight = 300;
+        newFFTAreaHeight = FFTAreaHeight;
+        fftHeight = FFTAreaHeight - 50;
+        dataWidth = 600;
+        lastWidgetPos.x = 0;
+        lastWidgetPos.y = 0;
+        lastWidgetSize.x = 0;
+        lastWidgetSize.y = 0;
+        latestFFT = new float[1];
+        waterfallFb = new uint32_t[1];
+
+        viewBandwidth = 1.0;
+        wholeBandwidth = 1.0;
+
+        updatePallette(COLOR_MAP, 13);
+    }
+
+    void WaterFall::init() {
+        glGenTextures(1, &textureId);
+    }
+
+    void WaterFall::drawFFT() {
+        // Calculate scaling factor
+        float startLine = floorf(fftMax / vRange) * vRange;
+        float vertRange = fftMax - fftMin;
+        float scaleFactor = fftHeight / vertRange;
+        char buf[100];
+
+        ImU32 trace = ImGui::GetColorU32(ImGuiCol_PlotLines);
+        ImU32 shadow = ImGui::GetColorU32(ImGuiCol_PlotLines, 0.2);
+
+        // Vertical scale
+        for (float line = startLine; line > fftMin; line -= vRange) {
+            float yPos = widgetPos.y + fftHeight + 10 - ((line - fftMin) * scaleFactor);
+            window->DrawList->AddLine(ImVec2(roundf(widgetPos.x + 50), roundf(yPos)), 
+                                    ImVec2(roundf(widgetPos.x + dataWidth + 50), roundf(yPos)),
+                                    IM_COL32(50, 50, 50, 255), 1.0);
+            sprintf(buf, "%d", (int)line);
+            ImVec2 txtSz = ImGui::CalcTextSize(buf);
+            window->DrawList->AddText(ImVec2(widgetPos.x + 40 - txtSz.x, roundf(yPos - (txtSz.y / 2.0))), IM_COL32( 255, 255, 255, 255 ), buf);
+        }
+
+        // Horizontal scale
+        double startFreq = ceilf(lowerFreq / range) * range;
+        double horizScale = (double)dataWidth / viewBandwidth;
+        for (double freq = startFreq; freq < upperFreq; freq += range) {
+            double xPos = widgetPos.x + 50 + ((freq - lowerFreq) * horizScale);
+            window->DrawList->AddLine(ImVec2(roundf(xPos), widgetPos.y + 10), 
+                                    ImVec2(roundf(xPos), widgetPos.y + fftHeight + 10),
+                                    IM_COL32(50, 50, 50, 255), 1.0);
+            window->DrawList->AddLine(ImVec2(roundf(xPos), widgetPos.y + fftHeight + 10), 
+                                    ImVec2(roundf(xPos), widgetPos.y + fftHeight + 17),
+                                    IM_COL32(255, 255, 255, 255), 1.0);
+            printAndScale(freq, buf);
+            ImVec2 txtSz = ImGui::CalcTextSize(buf);
+            window->DrawList->AddText(ImVec2(roundf(xPos - (txtSz.x / 2.0)), widgetPos.y + fftHeight + 10 + txtSz.y), IM_COL32( 255, 255, 255, 255 ), buf);
+        }
+
+        // Data
+        for (int i = 1; i < dataWidth; i++) {
+            double aPos = widgetPos.y + fftHeight + 10 - ((latestFFT[i - 1] - fftMin) * scaleFactor);
+            double bPos = widgetPos.y + fftHeight + 10 - ((latestFFT[i] - fftMin) * scaleFactor);
+            aPos = std::clamp<double>(aPos, widgetPos.y + 10, widgetPos.y + fftHeight + 10);
+            bPos = std::clamp<double>(bPos, widgetPos.y + 10, widgetPos.y + fftHeight + 10);
+            window->DrawList->AddLine(ImVec2(widgetPos.x + 49 + i, roundf(aPos)), 
+                                    ImVec2(widgetPos.x + 50 + i, roundf(bPos)), trace, 1.0);
+            window->DrawList->AddLine(ImVec2(widgetPos.x + 50 + i, roundf(bPos)), 
+                                    ImVec2(widgetPos.x + 50 + i, widgetPos.y + fftHeight + 10), shadow, 1.0);
+        }
+
+        // X Axis
+        window->DrawList->AddLine(ImVec2(widgetPos.x + 50, widgetPos.y + fftHeight + 10), 
+                                    ImVec2(widgetPos.x + dataWidth + 50, widgetPos.y + fftHeight + 10),
+                                    IM_COL32(255, 255, 255, 255), 1.0);
+        // Y Axis
+        window->DrawList->AddLine(ImVec2(widgetPos.x + 50, widgetPos.y + 9), 
+                                    ImVec2(widgetPos.x + 50, widgetPos.y + fftHeight + 9),
+                                    IM_COL32(255, 255, 255, 255), 1.0);
+
+        
+    }
+
+    void WaterFall::drawWaterfall() {
+        if (waterfallUpdate) {
+            waterfallUpdate = false;
+            updateWaterfallTexture();
+        }
+        window->DrawList->AddImage((void*)(intptr_t)textureId, ImVec2(widgetPos.x + 50, widgetPos.y + fftHeight + 51),
+                                ImVec2(widgetPos.x + 50 + dataWidth, widgetPos.y + fftHeight + 51 + waterfallHeight));
+    }
+
+    void WaterFall::drawVFOs() {
+        for (auto const& [name, vfo] : vfos) {
+            if (vfo->redrawRequired) {
+                vfo->redrawRequired = false;
+                vfo->updateDrawingVars(viewBandwidth, dataWidth, viewOffset, widgetPos, fftHeight);
+            }
+            vfo->draw(window, name == selectedVFO);
+        }
+    }
+
+    void WaterFall::selectFirstVFO() {
+        bool available = false;
+        for (auto const& [name, vfo] : vfos) {
+            available = true;
+            selectedVFO = name;
+            return;
+        }
+        if (!available) {
+            selectedVFO = "";
+        }
+    }
+
+    void WaterFall::processInputs() {
+        WaterfallVFO* vfo = NULL;
+        if (selectedVFO != "") {
+            vfo = vfos[selectedVFO];
+        }
+        ImVec2 mousePos = ImGui::GetMousePos();
+        ImVec2 drag = ImGui::GetMouseDragDelta(ImGuiMouseButton_Left);
+        ImVec2 dragOrigin(mousePos.x - drag.x, mousePos.y - drag.y);
+
+        bool mouseHovered, mouseHeld;
+        bool mouseClicked = ImGui::ButtonBehavior(ImRect(fftAreaMin, fftAreaMax), GetID("WaterfallID"), &mouseHovered, &mouseHeld, 
+                                                ImGuiButtonFlags_MouseButtonLeft | ImGuiButtonFlags_PressedOnClick);
+        
+        bool draging = ImGui::IsMouseDragging(ImGuiMouseButton_Left) && ImGui::IsWindowFocused();
+        bool mouseInFreq = IS_IN_AREA(dragOrigin, freqAreaMin, freqAreaMax);
+        bool mouseInFFT = IS_IN_AREA(dragOrigin, fftAreaMin, fftAreaMax);
+        
+
+        // If mouse was clicked on a VFO, select VFO and return
+        // If mouse was clicked but not on a VFO, move selected VFO to position
+        if (mouseClicked) {
+            for (auto const& [name, _vfo] : vfos) {
+                if (name == selectedVFO) {
+                    continue;
+                }
+                if (IS_IN_AREA(mousePos, _vfo->rectMin, _vfo->rectMax)) {
+                    selectedVFO = name;
+                    selectedVFOChanged = true;
+                    return;
+                }
+            }
+            if (vfo != NULL) {
+                int refCenter = mousePos.x - (widgetPos.x + 50);
+                if (refCenter >= 0 && refCenter < dataWidth && mousePos.y > widgetPos.y && mousePos.y < (widgetPos.y + widgetSize.y)) {
+                    double off = ((((double)refCenter / ((double)dataWidth / 2.0)) - 1.0) * (viewBandwidth / 2.0)) + viewOffset;
+                    off += centerFreq;
+                    off = (round(off / vfo->snapInterval) * vfo->snapInterval) - centerFreq;
+                    vfo->setOffset(off);
+                }
+            }
+        }
+
+        // Draging VFO
+        if (draging && mouseInFFT) {
+            int refCenter = mousePos.x - (widgetPos.x + 50);
+            if (refCenter >= 0 && refCenter < dataWidth && mousePos.y > widgetPos.y && mousePos.y < (widgetPos.y + widgetSize.y) && vfo != NULL) {
+                double off = ((((double)refCenter / ((double)dataWidth / 2.0)) - 1.0) * (viewBandwidth / 2.0)) + viewOffset;
+                off += centerFreq;
+                off = (round(off / vfo->snapInterval) * vfo->snapInterval) - centerFreq;
+                vfo->setOffset(off);
+            }
+        } 
+
+        // Draging frequency scale
+        if (draging && mouseInFreq) {
+            double deltax = drag.x - lastDrag;
+            lastDrag = drag.x;
+            double viewDelta = deltax * (viewBandwidth / (double)dataWidth);
+
+            viewOffset -= viewDelta;
+
+            if (viewOffset + (viewBandwidth / 2.0) > wholeBandwidth / 2.0) {
+                double freqOffset = (viewOffset + (viewBandwidth / 2.0)) - (wholeBandwidth / 2.0);
+                viewOffset = (wholeBandwidth / 2.0) - (viewBandwidth / 2.0);
+                centerFreq += freqOffset;
+                centerFreqMoved = true;
+            }
+            if (viewOffset - (viewBandwidth / 2.0) < -(wholeBandwidth / 2.0)) {
+                double freqOffset = (viewOffset - (viewBandwidth / 2.0)) + (wholeBandwidth / 2.0);
+                viewOffset = (viewBandwidth / 2.0) - (wholeBandwidth / 2.0);
+                centerFreq += freqOffset;
+                centerFreqMoved = true;
+            }
+
+            lowerFreq = (centerFreq + viewOffset) - (viewBandwidth / 2.0);
+            upperFreq = (centerFreq + viewOffset) + (viewBandwidth / 2.0);
+
+            if (viewBandwidth != wholeBandwidth) {
+                updateAllVFOs();
+                updateWaterfallFb();
+            }
+        }
+        else {
+            lastDrag = 0;
+        }
+    }
+
+    void WaterFall::updateWaterfallFb() {
+        if (!waterfallVisible || rawFFTs == NULL) {
+            return;
+        }
+        double offsetRatio = viewOffset / (wholeBandwidth / 2.0);
+        int drawDataSize;
+        int drawDataStart;
+        // TODO: Maybe put on the stack for faster alloc?
+        float* tempData = new float[dataWidth];
+        float pixel;
+        float dataRange = waterfallMax - waterfallMin;
+        int count = std::min<float>(waterfallHeight, fftLines);
+        if (rawFFTs != NULL) {
+            for (int i = 0; i < count; i++) {
+                drawDataSize = (viewBandwidth / wholeBandwidth) * rawFFTSize;
+                drawDataStart = (((double)rawFFTSize / 2.0) * (offsetRatio + 1)) - (drawDataSize / 2);
+                doZoom(drawDataStart, drawDataSize, dataWidth, &rawFFTs[((i + currentFFTLine) % waterfallHeight) * rawFFTSize], tempData);
+                for (int j = 0; j < dataWidth; j++) {
+                    pixel = (std::clamp<float>(tempData[j], waterfallMin, waterfallMax) - waterfallMin) / dataRange;
+                    waterfallFb[(i * dataWidth) + j] = waterfallPallet[(int)(pixel * (WATERFALL_RESOLUTION - 1))];
+                }
+            }
+        }
+        delete[] tempData;
+        waterfallUpdate = true;
+    }
+
+    void WaterFall::drawBandPlan() {
+        int count = bandplan->bands.size();
+        double horizScale = (double)dataWidth / viewBandwidth;
+        double start, end, center, aPos, bPos, cPos, width;
+        ImVec2 txtSz;
+        bool startVis, endVis;
+        uint32_t color, colorTrans;
+        for (int i = 0; i < count; i++) {
+            start = bandplan->bands[i].start;
+            end = bandplan->bands[i].end;
+            if (start < lowerFreq && end < lowerFreq) {
+                continue;
+            }
+            if (start > upperFreq && end > upperFreq) {
+                continue;
+            }
+            startVis = (start > lowerFreq);
+            endVis = (end < upperFreq);
+            start = std::clamp<double>(start, lowerFreq, upperFreq);
+            end = std::clamp<double>(end, lowerFreq, upperFreq);
+            center = (start + end) / 2.0;
+            aPos = widgetPos.x + 50 + ((start - lowerFreq) * horizScale);
+            bPos = widgetPos.x + 50 + ((end - lowerFreq) * horizScale);
+            cPos = widgetPos.x + 50 + ((center - lowerFreq) * horizScale);
+            width = bPos - aPos;
+            txtSz = ImGui::CalcTextSize(bandplan->bands[i].name.c_str());
+            if (bandplan::colorTable.find(bandplan->bands[i].type.c_str()) != bandplan::colorTable.end()) {
+                color = bandplan::colorTable[bandplan->bands[i].type].colorValue;
+                colorTrans = bandplan::colorTable[bandplan->bands[i].type].transColorValue;
+            }
+            else {
+                color = IM_COL32(255, 255, 255, 255);
+                colorTrans = IM_COL32(255, 255, 255, 100);
+            }
+            if (aPos <= widgetPos.x + 50) {
+                aPos = widgetPos.x + 51;
+            }
+            if (bPos <= widgetPos.x + 50) {
+                bPos = widgetPos.x + 51;
+            }
+            if (width >= 1.0) {
+                window->DrawList->AddRectFilled(ImVec2(roundf(aPos), widgetPos.y + fftHeight - 25), 
+                                        ImVec2(roundf(bPos), widgetPos.y + fftHeight + 10), colorTrans);
+                if (startVis) {
+                    window->DrawList->AddLine(ImVec2(roundf(aPos), widgetPos.y + fftHeight - 26), 
+                                        ImVec2(roundf(aPos), widgetPos.y + fftHeight + 9), color);
+                }
+                if (endVis) {
+                    window->DrawList->AddLine(ImVec2(roundf(bPos), widgetPos.y + fftHeight - 26), 
+                                        ImVec2(roundf(bPos), widgetPos.y + fftHeight + 9), color);
+                }
+            }
+            if (txtSz.x <= width) {
+                window->DrawList->AddText(ImVec2(cPos - (txtSz.x / 2.0), widgetPos.y + fftHeight - 17), 
+                                    IM_COL32(255, 255, 255, 255), bandplan->bands[i].name.c_str());
+            }
+        }
+    }
+
+    void WaterFall::updateWaterfallTexture() {
+        glBindTexture(GL_TEXTURE_2D, textureId);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+        glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, dataWidth, waterfallHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, (uint8_t*)waterfallFb);
+    }
+
+    void WaterFall::onPositionChange() {
+        // Nothing to see here...
+    }
+
+    void WaterFall::onResize() {
+        // return if widget is too small
+        if (widgetSize.x < 100 || widgetSize.y < 100) {
+            return;
+        }
+
+        int lastWaterfallHeight = waterfallHeight;
+
+        if (waterfallVisible) {
+            FFTAreaHeight = std::min<int>(FFTAreaHeight, widgetSize.y - 50);
+            fftHeight = FFTAreaHeight - 50;
+            waterfallHeight = widgetSize.y - fftHeight - 52;
+        }
+        else {
+            fftHeight =  widgetSize.y - 50;
+        }
+        dataWidth = widgetSize.x - 60.0;
+        delete[] latestFFT;
+
+        // Raw FFT resize
+        fftLines = std::min<int>(fftLines, waterfallHeight);
+        if (rawFFTs != NULL) {
+            if (currentFFTLine != 0) {
+                float* tempWF = new float[currentFFTLine * rawFFTSize];
+                int moveCount = lastWaterfallHeight - currentFFTLine;
+                memcpy(tempWF, rawFFTs, currentFFTLine * rawFFTSize * sizeof(float));
+                memmove(rawFFTs, &rawFFTs[currentFFTLine * rawFFTSize], moveCount * rawFFTSize * sizeof(float));
+                memcpy(&rawFFTs[moveCount * rawFFTSize], tempWF, currentFFTLine * rawFFTSize * sizeof(float));
+                delete[] tempWF;
+            }
+            currentFFTLine = 0;
+            rawFFTs = (float*)realloc(rawFFTs, waterfallHeight * rawFFTSize * sizeof(float));
+        }
+        else {
+            rawFFTs = (float*)malloc(waterfallHeight * rawFFTSize * sizeof(float));
+        }
+        // ==============
+
+        latestFFT = new float[dataWidth];
+        if (waterfallVisible) {
+            delete[] waterfallFb;
+            waterfallFb = new uint32_t[dataWidth * waterfallHeight];
+            memset(waterfallFb, 0, dataWidth * waterfallHeight * sizeof(uint32_t));
+        }
+        for (int i = 0; i < dataWidth; i++) {
+            latestFFT[i] = -1000.0; // Hide everything
+        }
+
+        fftAreaMin = ImVec2(widgetPos.x + 50, widgetPos.y + 9);
+        fftAreaMax = ImVec2(widgetPos.x + dataWidth + 50, widgetPos.y + fftHeight + 10);
+        freqAreaMin = ImVec2(widgetPos.x + 50, widgetPos.y + fftHeight + 11);
+        freqAreaMax = ImVec2(widgetPos.x + dataWidth + 50, widgetPos.y + fftHeight + 50);
+
+        maxHSteps = dataWidth / (ImGui::CalcTextSize("000.000").x + 10);
+        maxVSteps = fftHeight / (ImGui::CalcTextSize("000.000").y);
+
+        range = findBestRange(viewBandwidth, maxHSteps);
+        vRange = findBestRange(fftMax - fftMin, maxVSteps);
+        vRange = 10.0;
+
+        updateWaterfallFb();
+        updateAllVFOs();
+    }
+
+    void WaterFall::draw() {
+        buf_mtx.lock();
+        window = GetCurrentWindow();
+
+        widgetPos = ImGui::GetWindowContentRegionMin();
+        widgetEndPos = ImGui::GetWindowContentRegionMax();
+        widgetPos.x += window->Pos.x;
+        widgetPos.y += window->Pos.y;
+        widgetEndPos.x += window->Pos.x - 4; // Padding
+        widgetEndPos.y += window->Pos.y;
+        widgetSize = ImVec2(widgetEndPos.x - widgetPos.x, widgetEndPos.y - widgetPos.y);
+
+        if (selectedVFO == "" && vfos.size() > 0) {
+            selectFirstVFO();
+        }
+
+        if (widgetPos.x != lastWidgetPos.x || widgetPos.y != lastWidgetPos.y) {
+            lastWidgetPos = widgetPos;
+            onPositionChange();
+        }
+        if (widgetSize.x != lastWidgetSize.x || widgetSize.y != lastWidgetSize.y) {
+            lastWidgetSize = widgetSize;
+            onResize();
+        }
+
+        window->DrawList->AddRectFilled(widgetPos, widgetEndPos, IM_COL32( 0, 0, 0, 255 ));
+        window->DrawList->AddRect(widgetPos, widgetEndPos, IM_COL32( 50, 50, 50, 255 ));
+        window->DrawList->AddLine(ImVec2(widgetPos.x, widgetPos.y + fftHeight + 50), ImVec2(widgetPos.x + widgetSize.x, widgetPos.y + fftHeight + 50), IM_COL32(50, 50, 50, 255), 1.0);
+
+        processInputs();
+        
+        drawFFT();
+        if (waterfallVisible) {
+            drawWaterfall();
+        }
+        drawVFOs();
+        if (bandplan != NULL && bandplanVisible) {
+            drawBandPlan();
+        }
+
+        if (!waterfallVisible) {
+            buf_mtx.unlock();
+            return;
+        }
+
+        // Handle fft resize
+        ImVec2 winSize = ImGui::GetWindowSize();
+        ImVec2 mousePos = ImGui::GetMousePos();
+        mousePos.x -= widgetPos.x;
+        mousePos.y -= widgetPos.y;
+        bool click = ImGui::IsMouseClicked(ImGuiMouseButton_Left);
+        bool down = ImGui::IsMouseDown(ImGuiMouseButton_Left);
+        if (draggingFW) {
+            newFFTAreaHeight = mousePos.y;
+            newFFTAreaHeight = std::clamp<float>(newFFTAreaHeight, 150, widgetSize.y - 50);
+            ImGui::GetForegroundDrawList()->AddLine(ImVec2(widgetPos.x, newFFTAreaHeight + widgetPos.y), ImVec2(widgetEndPos.x, newFFTAreaHeight + widgetPos.y), 
+                                                    ImGui::GetColorU32(ImGuiCol_SeparatorActive));
+        }
+        if (mousePos.y >= newFFTAreaHeight - 2 && mousePos.y <= newFFTAreaHeight + 2 && mousePos.x > 0 && mousePos.x < widgetSize.x) {
+            ImGui::SetMouseCursor(ImGuiMouseCursor_ResizeNS);
+            if (click) {
+                draggingFW = true;
+            }
+        }
+        if(!down && draggingFW) {
+            draggingFW = false;
+            FFTAreaHeight = newFFTAreaHeight;
+            onResize();
+        }
+
+        buf_mtx.unlock();
+    }
+
+    float* WaterFall::getFFTBuffer() {
+        if (rawFFTs == NULL) { return NULL; }
+        buf_mtx.lock();
+        currentFFTLine--;
+        fftLines++;
+        currentFFTLine = ((currentFFTLine + waterfallHeight) % waterfallHeight);
+        fftLines = std::min<float>(fftLines, waterfallHeight);
+        return &rawFFTs[currentFFTLine * rawFFTSize];
+    }
+
+    void WaterFall::pushFFT() {
+        if (rawFFTs == NULL) { return; }
+        double offsetRatio = viewOffset / (wholeBandwidth / 2.0);
+        int drawDataSize = (viewBandwidth / wholeBandwidth) * rawFFTSize;
+        int drawDataStart = (((double)rawFFTSize / 2.0) * (offsetRatio + 1)) - (drawDataSize / 2);
+        
+        doZoom(drawDataStart, drawDataSize, dataWidth, &rawFFTs[currentFFTLine * rawFFTSize], latestFFT);
+
+        if (waterfallVisible) {
+            memmove(&waterfallFb[dataWidth], waterfallFb, dataWidth * (waterfallHeight - 1) * sizeof(uint32_t));
+            float pixel;
+            float dataRange = waterfallMax - waterfallMin;
+            for (int j = 0; j < dataWidth; j++) {
+                pixel = (std::clamp<float>(latestFFT[j], waterfallMin, waterfallMax) - waterfallMin) / dataRange;
+                int id = (int)(pixel * (WATERFALL_RESOLUTION - 1));
+                waterfallFb[j] = waterfallPallet[id];
+            }
+            waterfallUpdate = true;
+        }
+        
+        buf_mtx.unlock();
+    }
+
+    void WaterFall::updatePallette(float colors[][3], int colorCount) {
+        for (int i = 0; i < WATERFALL_RESOLUTION; i++) {
+            int lowerId = floorf(((float)i / (float)WATERFALL_RESOLUTION) * colorCount);
+            int upperId = ceilf(((float)i / (float)WATERFALL_RESOLUTION) * colorCount);
+            lowerId = std::clamp<int>(lowerId, 0, colorCount - 1);
+            upperId = std::clamp<int>(upperId, 0, colorCount - 1);
+            float ratio = (((float)i / (float)WATERFALL_RESOLUTION) * colorCount) - lowerId;
+            float r = (colors[lowerId][0] * (1.0 - ratio)) + (colors[upperId][0] * (ratio));
+            float g = (colors[lowerId][1] * (1.0 - ratio)) + (colors[upperId][1] * (ratio));
+            float b = (colors[lowerId][2] * (1.0 - ratio)) + (colors[upperId][2] * (ratio));
+            waterfallPallet[i] = ((uint32_t)255 << 24) | ((uint32_t)b << 16) | ((uint32_t)g << 8) | (uint32_t)r;
+        }
+    }
+
+    void WaterFall::autoRange() {
+        float min = INFINITY;
+        float max = -INFINITY;
+        for (int i = 0; i < dataWidth; i++) {
+            if (latestFFT[i] < min) {
+                min = latestFFT[i];
+            }
+            if (latestFFT[i] > max) {
+                max = latestFFT[i];
+            }
+        }
+        fftMin = min - 5;
+        fftMax = max + 5;
+    }
+
+    void WaterFall::setCenterFrequency(double freq) {
+        centerFreq = freq;
+        lowerFreq = (centerFreq + viewOffset) - (viewBandwidth / 2.0);
+        upperFreq = (centerFreq + viewOffset) + (viewBandwidth / 2.0);
+        updateAllVFOs();
+    }
+
+    double WaterFall::getCenterFrequency() {
+        return centerFreq;
+    }
+
+    void WaterFall::setBandwidth(double bandWidth) {
+        double currentRatio = viewBandwidth / wholeBandwidth;
+        wholeBandwidth = bandWidth;
+        setViewBandwidth(bandWidth * currentRatio);
+        for (auto const& [name, vfo] : vfos) {
+            if (vfo->lowerOffset < -(bandWidth / 2)) {
+                vfo->setCenterOffset(-(bandWidth / 2));
+            }
+            if (vfo->upperOffset > (bandWidth / 2)) {
+                vfo->setCenterOffset(bandWidth / 2);
+            }
+        }
+        updateAllVFOs();
+    }
+
+    double WaterFall::getBandwidth() {
+        return wholeBandwidth;
+    }
+
+    void WaterFall::setViewBandwidth(double bandWidth) {
+        if (bandWidth == viewBandwidth) {
+            return;
+        }
+        if (abs(viewOffset) + (bandWidth / 2.0) > wholeBandwidth / 2.0) {
+            if (viewOffset < 0) {
+                viewOffset = (bandWidth / 2.0) - (wholeBandwidth / 2.0);
+            }
+            else {
+                viewOffset = (wholeBandwidth / 2.0) - (bandWidth / 2.0);
+            }
+        }
+        viewBandwidth = bandWidth;
+        lowerFreq = (centerFreq + viewOffset) - (viewBandwidth / 2.0);
+        upperFreq = (centerFreq + viewOffset) + (viewBandwidth / 2.0);
+        range = findBestRange(bandWidth, maxHSteps);
+        updateWaterfallFb();
+        updateAllVFOs();
+    }
+
+    double WaterFall::getViewBandwidth() {
+        return viewBandwidth;
+    }
+
+    void WaterFall::setViewOffset(double offset) {
+        if (offset == viewOffset) {
+            return;
+        }
+        if (offset - (viewBandwidth / 2.0) < -(wholeBandwidth / 2.0)) {
+            offset = (viewBandwidth / 2.0) - (wholeBandwidth / 2.0);
+        }
+        if (offset + (viewBandwidth / 2.0) > (wholeBandwidth / 2.0)) {
+            offset = (wholeBandwidth / 2.0) - (viewBandwidth / 2.0);
+        }
+        viewOffset = offset;
+        lowerFreq = (centerFreq + viewOffset) - (viewBandwidth / 2.0);
+        upperFreq = (centerFreq + viewOffset) + (viewBandwidth / 2.0);
+        updateWaterfallFb();
+        updateAllVFOs();
+    }
+
+    double WaterFall::getViewOffset() {
+        return viewOffset;
+    }
+    
+    void WaterFall::setFFTMin(float min) {
+        fftMin = min;
+        vRange = findBestRange(fftMax - fftMin, maxVSteps);
+    }
+
+    float WaterFall::getFFTMin() {
+        return fftMin;
+    }
+
+    void WaterFall::setFFTMax(float max) {
+        fftMax = max;
+        vRange = findBestRange(fftMax - fftMin, maxVSteps);
+    }
+
+    float WaterFall::getFFTMax() {
+        return fftMax;
+    }
+
+    void WaterFall::setWaterfallMin(float min) {
+        if (min == waterfallMin) {
+            return;
+        }
+        waterfallMin = min;
+        updateWaterfallFb();
+    }
+
+    float WaterFall::getWaterfallMin() {
+        return waterfallMin;
+    }
+
+    void WaterFall::setWaterfallMax(float max) {
+        if (max == waterfallMax) {
+            return;
+        }
+        waterfallMax = max;
+        updateWaterfallFb();
+    }
+
+    float WaterFall::getWaterfallMax() {
+        return waterfallMax;
+    }
+
+    void WaterFall::updateAllVFOs() {
+        for (auto const& [name, vfo] : vfos) {
+            vfo->updateDrawingVars(viewBandwidth, dataWidth, viewOffset, widgetPos, fftHeight);
+        }
+    }
+
+    void WaterFall::setRawFFTSize(int size, bool lock) {
+        if (lock) { buf_mtx.lock(); }
+        rawFFTSize = size;
+        if (rawFFTs != NULL) {
+            rawFFTs = (float*)realloc(rawFFTs, rawFFTSize * waterfallHeight * sizeof(float));
+        }
+        else {
+            rawFFTs = (float*)malloc(rawFFTSize * waterfallHeight * sizeof(float));
+        }
+        memset(rawFFTs, 0, rawFFTSize * waterfallHeight * sizeof(float));
+        if (lock) { buf_mtx.unlock(); }
+    }
+
+    void WaterfallVFO::setOffset(double offset) {
+        generalOffset = offset;
+        if (reference == REF_CENTER) {
+            centerOffset = offset;
+            lowerOffset = offset - (bandwidth / 2.0);
+            upperOffset = offset + (bandwidth / 2.0);
+        }
+        else if (reference == REF_LOWER) {
+            lowerOffset = offset;
+            centerOffset = offset + (bandwidth / 2.0);
+            upperOffset = offset + bandwidth;
+        }
+        else if (reference == REF_UPPER) {
+            upperOffset = offset;
+            centerOffset = offset - (bandwidth / 2.0);
+            lowerOffset = offset - bandwidth;
+        }
+        centerOffsetChanged = true;
+        upperOffsetChanged = true;
+        lowerOffsetChanged = true;
+        redrawRequired = true;
+    }
+
+    void WaterfallVFO::setCenterOffset(double offset) {
+        if (reference == REF_CENTER) {
+            generalOffset = offset;
+        }
+        else if (reference == REF_LOWER) {
+            generalOffset = offset - (bandwidth / 2.0);
+        }
+        else if (reference == REF_UPPER) {
+            generalOffset = offset + (bandwidth / 2.0);
+        }
+        centerOffset = offset;
+        lowerOffset = offset - (bandwidth / 2.0);
+        upperOffset = offset + (bandwidth / 2.0);
+        centerOffsetChanged = true;
+        upperOffsetChanged = true;
+        lowerOffsetChanged = true;
+        redrawRequired = true;
+    }
+
+    void WaterfallVFO::setBandwidth(double bw) {
+        if (bandwidth == bw || bw < 0) {
+            return;
+        }
+        bandwidth = bw;
+        if (reference == REF_CENTER) {
+            lowerOffset = centerOffset - (bandwidth / 2.0);
+            upperOffset = centerOffset + (bandwidth / 2.0);
+        }
+        else if (reference == REF_LOWER) {
+            centerOffset = lowerOffset + (bandwidth / 2.0);
+            upperOffset = lowerOffset + bandwidth;
+            centerOffsetChanged = true;
+        }
+        else if (reference == REF_UPPER) {
+            centerOffset = upperOffset - (bandwidth / 2.0);
+            lowerOffset = upperOffset - bandwidth;
+            centerOffsetChanged = true;
+        }
+        redrawRequired = true;
+    }
+
+    void WaterfallVFO::setReference(int ref) {
+        if (reference == ref || ref < 0 || ref >= _REF_COUNT) {
+            return;
+        }
+        reference = ref;
+        setOffset(generalOffset);
+        
+    }
+
+    void WaterfallVFO::updateDrawingVars(double viewBandwidth, float dataWidth, double viewOffset, ImVec2 widgetPos, int fftHeight) {
+        double width = (bandwidth / viewBandwidth) * (double)dataWidth;
+        int center = roundf((((centerOffset - viewOffset) / (viewBandwidth / 2.0)) + 1.0) * ((double)dataWidth / 2.0));
+        int left = roundf((((lowerOffset - viewOffset) / (viewBandwidth / 2.0)) + 1.0) * ((double)dataWidth / 2.0));
+        int right = roundf((((upperOffset - viewOffset) / (viewBandwidth / 2.0)) + 1.0) * ((double)dataWidth / 2.0));
+
+        if (left >= 0 && left < dataWidth && reference == REF_LOWER) {
+            lineMin = ImVec2(widgetPos.x + 50 + left, widgetPos.y + 9);
+            lineMax = ImVec2(widgetPos.x + 50 + left, widgetPos.y + fftHeight + 9);
+            lineVisible = true;
+        }
+        else if (center >= 0 && center < dataWidth && reference == REF_CENTER) {
+            lineMin = ImVec2(widgetPos.x + 50 + center, widgetPos.y + 9);
+            lineMax = ImVec2(widgetPos.x + 50 + center, widgetPos.y + fftHeight + 9);
+            lineVisible = true;
+        }
+        else if (right >= 0 && right < dataWidth && reference == REF_UPPER) {
+            lineMin = ImVec2(widgetPos.x + 50 + right, widgetPos.y + 9);
+            lineMax = ImVec2(widgetPos.x + 50 + right, widgetPos.y + fftHeight + 9);
+            lineVisible = true;
+        }
+        else {
+            lineVisible = false;
+        }
+
+        left = std::clamp<int>(left, 0, dataWidth - 1);
+        right = std::clamp<int>(right, 0, dataWidth - 1);
+
+        rectMin = ImVec2(widgetPos.x + 50 + left, widgetPos.y + 10);
+        rectMax = ImVec2(widgetPos.x + 51 + right, widgetPos.y + fftHeight + 10);
+    }
+
+    void WaterfallVFO::draw(ImGuiWindow* window, bool selected) {
+        window->DrawList->AddRectFilled(rectMin, rectMax, IM_COL32(255, 255, 255, 50));
+        if (lineVisible) {
+            window->DrawList->AddLine(lineMin, lineMax, selected ? IM_COL32(255, 0, 0, 255) : IM_COL32(255, 255, 0, 255));
+        }
+    };
+
+    void WaterFall::showWaterfall() {
+        waterfallVisible = true;
+        onResize();
+    }
+
+    void WaterFall::hideWaterfall() {
+        waterfallVisible = false;
+        onResize();
+    }
+
+    void WaterFall::setFFTHeight(int height) {
+        FFTAreaHeight = height;
+        newFFTAreaHeight = height;
+        onResize();
+    }
+    
+    int WaterFall::getFFTHeight() {
+        return FFTAreaHeight;
+    }
+
+    void WaterFall::showBandplan() {
+        bandplanVisible = true;
+    }
+
+    void WaterFall::hideBandplan() {
+        bandplanVisible = false;
+    }
+
+    void WaterfallVFO::setSnapInterval(double interval) {
+        snapInterval = interval;
+    }
+};
+

core/src/gui/widgets/waterfall.h

@@ -0,0 +1,202 @@
+#pragma once
+#include <vector>
+#include <mutex>
+#include <gui/widgets/bandplan.h>
+#include <imgui/imgui.h>
+#include <imgui/imgui_internal.h>
+#include <GL/glew.h>
+
+#define WATERFALL_RESOLUTION    1000000
+
+namespace ImGui {
+    class WaterfallVFO {
+    public:
+        void setOffset(double offset);
+        void setCenterOffset(double offset);
+        void setBandwidth(double bw);
+        void setReference(int ref);
+        void setSnapInterval(double interval);
+        void updateDrawingVars(double viewBandwidth, float dataWidth, double viewOffset, ImVec2 widgetPos, int fftHeight); // NOTE: Datawidth double???
+        void draw(ImGuiWindow* window, bool selected);
+
+        enum {
+            REF_LOWER,
+            REF_CENTER,
+            REF_UPPER,
+            _REF_COUNT
+        };
+
+        double generalOffset;
+        double centerOffset;
+        double lowerOffset;
+        double upperOffset;
+        double bandwidth;
+        double snapInterval = 5000;
+        int reference = REF_CENTER;
+
+        ImVec2 rectMin;
+        ImVec2 rectMax;
+        ImVec2 lineMin;
+        ImVec2 lineMax;
+
+        bool centerOffsetChanged = false;
+        bool lowerOffsetChanged = false;
+        bool upperOffsetChanged = false;
+        bool redrawRequired = true;
+        bool lineVisible = true;
+    };
+
+    class WaterFall {
+    public:
+        WaterFall();
+
+        void init();
+
+        void draw();
+        float* getFFTBuffer();
+        void pushFFT();
+
+        void updatePallette(float colors[][3], int colorCount);
+
+        void setCenterFrequency(double freq);
+        double getCenterFrequency();
+
+        void setBandwidth(double bandWidth);
+        double getBandwidth();
+
+        void setViewBandwidth(double bandWidth);
+        double getViewBandwidth();
+
+        void setViewOffset(double offset);
+        double getViewOffset();
+
+        void setFFTMin(float min);
+        float getFFTMin();
+
+        void setFFTMax(float max);
+        float getFFTMax();
+
+        void setWaterfallMin(float min);
+        float getWaterfallMin();
+
+        void setWaterfallMax(float max);
+        float getWaterfallMax();
+
+        void setZoom(double zoomLevel);
+        void setOffset(double zoomOffset);
+
+        void autoRange();
+
+        void selectFirstVFO();
+
+        void showWaterfall();
+        void hideWaterfall();
+
+        void showBandplan();
+        void hideBandplan();
+
+        void setFFTHeight(int height);
+        int getFFTHeight();
+
+        void setRawFFTSize(int size, bool lock = true);
+
+        bool centerFreqMoved = false;
+        bool vfoFreqChanged = false;
+        bool bandplanEnabled = false;
+        bandplan::BandPlan_t* bandplan = NULL;
+
+        std::map<std::string, WaterfallVFO*> vfos;
+        std::string selectedVFO = "";
+        bool selectedVFOChanged = false;
+
+        enum {
+            REF_LOWER,
+            REF_CENTER,
+            REF_UPPER,
+            _REF_COUNT
+        };
+
+
+    private:
+        void drawWaterfall();
+        void drawFFT();
+        void drawVFOs();
+        void drawBandPlan();
+        void processInputs();
+        void onPositionChange();
+        void onResize();
+        void updateWaterfallFb();
+        void updateWaterfallTexture();
+        void updateAllVFOs();
+
+        bool waterfallUpdate = false;
+
+        uint32_t waterfallPallet[WATERFALL_RESOLUTION];
+        
+        ImVec2 widgetPos;
+        ImVec2 widgetEndPos;
+        ImVec2 widgetSize;
+
+        ImVec2 lastWidgetPos;
+        ImVec2 lastWidgetSize;
+
+        ImVec2 fftAreaMin;
+        ImVec2 fftAreaMax;
+        ImVec2 freqAreaMin;
+        ImVec2 freqAreaMax;
+        ImVec2 waterfallAreaMin;
+        ImVec2 waterfallAreaMax;
+
+        ImGuiWindow* window;
+
+        GLuint textureId;
+
+        std::mutex buf_mtx;
+
+        float vRange;
+
+        int maxVSteps;
+        int maxHSteps;
+
+        int dataWidth;              // Width of the FFT and waterfall
+        int fftHeight;              // Height of the fft graph
+        int waterfallHeight = 0;    // Height of the waterfall
+
+        double viewBandwidth;
+        double viewOffset;
+
+        double lowerFreq;
+        double upperFreq;
+        double range;
+
+        float lastDrag;
+
+        int vfoRef = REF_CENTER;
+
+        // Absolute values
+        double centerFreq;
+        double wholeBandwidth;
+
+        // Ranges
+        float fftMin;
+        float fftMax;
+        float waterfallMin;
+        float waterfallMax;
+
+        //std::vector<std::vector<float>> rawFFTs;
+        int rawFFTSize;
+        float* rawFFTs = NULL;
+        float* latestFFT;
+        int currentFFTLine = 0;
+        int fftLines = 0;
+
+        uint32_t* waterfallFb;
+
+        bool draggingFW = false;
+        int FFTAreaHeight;
+        int newFFTAreaHeight;
+
+        bool waterfallVisible = true;
+        bool bandplanVisible = false;
+    };
+};

core/src/imgui/imgui_widgets.cpp

@@ -2640,6 +2640,7 @@ bool ImGui::SliderScalar(const char* label, ImGuiDataType data_type, void* p_dat
 
     // Slider behavior
     ImRect grab_bb;
+
     const bool value_changed = SliderBehavior(frame_bb, id, data_type, p_data, p_min, p_max, format, power, ImGuiSliderFlags_None, &grab_bb);
     if (value_changed)
         MarkItemEdited(id);

core/src/new_module.cpp

@@ -0,0 +1,145 @@
+#include <new_module.h>
+#include <filesystem>
+#include <spdlog/spdlog.h>
+
+ModuleManager::Module_t ModuleManager::loadModule(std::string path) {
+    Module_t mod;
+    if (!std::filesystem::exists(path)) {
+        spdlog::error("{0} does not exist", path);
+        mod.handle = NULL;
+        return mod;
+    }
+    if (!std::filesystem::is_regular_file(path)) {
+        spdlog::error("{0} isn't a loadable module", path);
+        mod.handle = NULL;
+        return mod;
+    }
+#ifdef _WIN32
+    mod.handle = LoadLibraryA(path.c_str());
+    if (mod.handle == NULL) {
+        spdlog::error("Couldn't load {0}.", path);
+        mod.handle = NULL;
+        return mod;
+    }
+    mod.info = (ModuleInfo_t*)GetProcAddress(mod.handle, "_INFO_");
+    mod.init = (void(*)())GetProcAddress(mod.handle, "_INIT_");
+    mod.createInstance = (Instance*(*)(std::string))GetProcAddress(mod.handle, "_CREATE_INSTANCE_");
+    mod.deleteInstance = (void(*)(Instance*))GetProcAddress(mod.handle, "_DELETE_INSTANCE_");
+    mod.end = (void(*)())GetProcAddress(mod.handle, "_END_");
+#else
+    mod.handle = dlopen(path.c_str(), RTLD_LAZY);
+    if (mod.handle == NULL) {
+        spdlog::error("Couldn't load {0}.", path);
+        mod.handle = NULL;
+        return mod;
+    }
+    mod.info = (ModuleInfo_t*)dlsym(mod.handle, "_INFO_");
+    mod.init = (void(*)())dlsym(mod.handle, "_INIT_");
+    mod.createInstance = (Instance*(*)(std::string))dlsym(mod.handle, "_CREATE_INSTANCE_");
+    mod.deleteInstance = (void(*)(Instance*))dlsym(mod.handle, "_DELETE_INSTANCE_");
+    mod.end = (void(*)())dlsym(mod.handle, "_END_");
+#endif
+    if (mod.info == NULL) {
+        spdlog::error("{0} is missing _INFO_ symbol", path);
+        mod.handle = NULL;
+        return mod;
+    }
+    if (mod.init == NULL) {
+        spdlog::error("{0} is missing _INIT_ symbol", path);
+        mod.handle = NULL;
+        return mod;
+    }
+    if (mod.createInstance == NULL) {
+        spdlog::error("{0} is missing _CREATE_INSTANCE_ symbol", path);
+        mod.handle = NULL;
+        return mod;
+    }
+    if (mod.deleteInstance == NULL) {
+        spdlog::error("{0} is missing _DELETE_INSTANCE_ symbol", path);
+        mod.handle = NULL;
+        return mod;
+    }
+    if (mod.end == NULL) {
+        spdlog::error("{0} is missing _END_ symbol", path);
+        mod.handle = NULL;
+        return mod;
+    }
+    if (modules.find(mod.info->name) != modules.end()) {
+        spdlog::error("{0} has the same name as an already loaded module", path);
+        mod.handle = NULL;
+        return mod;
+    }
+    for (auto const& [name, _mod] : modules) {
+        if (mod.handle == _mod.handle) {
+            return _mod;
+        }
+    }
+    mod.init();
+    modules[mod.info->name] = mod;
+    return mod;
+}
+
+void ModuleManager::createInstance(std::string name, std::string module) {
+    if (modules.find(module) == modules.end()) {
+        spdlog::error("Module '{0}' doesn't exist", module);
+        return;
+    }
+    if (instances.find(name) != instances.end()) {
+        spdlog::error("A module instance with the name '{0}' already exists", name);
+        return;
+    }
+    int maxCount = modules[module].info->maxInstances;
+    if (countModuleInstances(module) >= maxCount && maxCount > 0) {
+        spdlog::error("Maximum number of instances reached for '{0}'", module);
+        return;
+    }
+    Instance_t inst;
+    inst.module = modules[module];
+    inst.instance = inst.module.createInstance(name);
+    instances[name] = inst;
+}
+
+void ModuleManager::deleteInstance(std::string name) {
+    spdlog::error("DELETE INSTANCE NOT IMPLEMENTED");
+}
+
+void ModuleManager::deleteInstance(ModuleManager::Instance* instance) {
+    spdlog::error("DELETE INSTANCE NOT IMPLEMENTED");
+}
+
+void ModuleManager::enableInstance(std::string name) {
+    if (instances.find(name) == instances.end()) {
+        spdlog::error("Cannot enable '{0}', instance doesn't exist", name);
+        return;
+    }
+    instances[name].instance->enable();
+}
+
+void ModuleManager::disableInstance(std::string name) {
+    if (instances.find(name) == instances.end()) {
+        spdlog::error("Cannot disable '{0}', instance doesn't exist", name);
+        return;
+    }
+    instances[name].instance->disable();
+}
+
+bool ModuleManager::instanceEnabled(std::string name) {
+    if (instances.find(name) == instances.end()) {
+        spdlog::error("Cannot check if '{0}' is enabled, instance doesn't exist", name);
+        return false;
+    }
+    return instances[name].instance->isEnabled();
+}
+
+int ModuleManager::countModuleInstances(std::string module) {
+    if (modules.find(module) == modules.end()) {
+        spdlog::error("Cannot count instances of '{0}', Module doesn't exist", module);
+        return -1;
+    }
+    ModuleManager::Module_t mod = modules[module];
+    int count = 0;
+    for (auto const& [name, instance] : instances) {
+        if (instance.module == mod) { count++; }
+    }
+    return count;
+}

core/src/new_module.h

@@ -0,0 +1,91 @@
+#pragma once
+#include <string>
+#include <map>
+#include <json.hpp>
+
+#ifdef _WIN32
+#ifdef SDRPP_IS_CORE
+#define SDRPP_EXPORT extern "C" __declspec(dllexport)
+#else
+#define SDRPP_EXPORT extern "C" __declspec(dllimport)
+#endif
+#else
+#define SDRPP_EXPORT extern
+#endif
+
+#ifdef _WIN32
+#include <Windows.h>
+#define MOD_EXPORT extern "C" __declspec(dllexport)
+#define SDRPP_MOD_EXTENTSION    ".dll"
+#else
+#include <dlfcn.h>
+#define MOD_EXPORT extern "C"
+#define SDRPP_MOD_EXTENTSION    ".so"
+#endif
+
+class ModuleManager {
+public:
+    struct ModuleInfo_t {
+        const char* name;
+        const char* description;
+        const char* author;
+        const int versionMajor;
+        const int versionMinor;
+        const int versionBuild;
+        const int maxInstances;
+    };
+
+    class Instance {
+    public:
+        virtual void enable() = 0;
+        virtual void disable() = 0;
+        virtual bool isEnabled() = 0;
+    };
+
+    struct Module_t {
+#ifdef _WIN32
+        HMODULE handle;
+#else
+        void* handle;
+#endif
+        ModuleManager::ModuleInfo_t* info;
+        void (*init)();
+        ModuleManager::Instance* (*createInstance)(std::string name);
+        void (*deleteInstance)(ModuleManager::Instance* instance);
+        void (*end)();
+
+        friend bool operator==(const Module_t& a, const Module_t& b) {
+            if (a.handle != b.handle) { return false; }
+            if (a.info != b.info) { return false; }
+            if (a.init != b.init) { return false; }
+            if (a.createInstance != b.createInstance) { return false; }
+            if (a.deleteInstance != b.deleteInstance) { return false; }
+            if (a.end != b.end) { return false; }
+            return true;
+        }
+    };
+
+    struct Instance_t {
+        ModuleManager::Module_t module;
+        ModuleManager::Instance* instance;
+    };
+
+    ModuleManager::Module_t loadModule(std::string path);
+
+    void createInstance(std::string name, std::string module);
+    void deleteInstance(std::string name);
+    void deleteInstance(ModuleManager::Instance* instance);
+
+    void enableInstance(std::string name);
+    void disableInstance(std::string name);
+    bool instanceEnabled(std::string name);
+
+    int countModuleInstances(std::string module);
+
+private:
+    std::map<std::string, ModuleManager::Module_t> modules;
+    std::map<std::string, ModuleManager::Instance_t> instances;
+
+};
+
+#define SDRPP_MOD_INFO    MOD_EXPORT const ModuleManager::ModuleInfo_t _INFO_

core/src/scripting.cpp

@@ -0,0 +1,93 @@
+#include <scripting.h>
+#include <duktape/duk_console.h>
+#include <version.h>
+#include <fstream>
+#include <sstream>
+#include <signal_path/signal_path.h>
+#include <imgui/imgui.h>
+
+ScriptManager::ScriptManager() {
+
+}
+
+ScriptManager::Script* ScriptManager::createScript(std::string name, std::string path) {
+    ScriptManager::Script* script =  new ScriptManager::Script(this, name, path);
+    scripts[name] = script;
+    return script;
+}
+
+ScriptManager::Script::Script(ScriptManager* man, std::string name, std::string path) {
+    this->name = name;
+    manager = man;
+    std::ifstream file(path, std::ios::in);
+    std::stringstream ss;
+    ss << file.rdbuf();
+    code = ss.str(); 
+}
+
+void ScriptManager::Script::run() {
+    ctx = ScriptManager::createContext(manager, name);
+    running = true;
+    if (worker.joinable()) {
+        worker.join();
+    }
+    worker = std::thread(scriptWorker, this);
+}
+
+duk_context* ScriptManager::createContext(ScriptManager* _this, std::string name) {
+    duk_context* ctx = duk_create_heap_default();
+
+    duk_console_init(ctx, DUK_CONSOLE_PROXY_WRAPPER);
+
+    duk_push_string(ctx, name.c_str());
+    duk_put_global_string(ctx, "SCRIPT_NAME");
+
+    duk_idx_t sdrppBase = duk_push_object(ctx);
+
+    // API
+
+    duk_push_string(ctx, VERSION_STR);
+    duk_put_prop_string(ctx, sdrppBase, "version");
+
+    duk_push_c_function(ctx, ScriptManager::duk_setSource, 1);
+    duk_put_prop_string(ctx, sdrppBase, "selectSource");
+
+    // Modules
+
+    duk_idx_t modObjId = duk_push_object(ctx);
+    for (const auto& [name, handler] : _this->handlers) {
+        duk_idx_t objId = duk_push_object(ctx);
+        handler.handler(handler.ctx, ctx, objId);
+        duk_put_prop_string(ctx, modObjId, name.c_str());
+    }
+    duk_put_prop_string(ctx, sdrppBase, "modules");
+
+    duk_put_global_string(ctx, "sdrpp");
+
+    return ctx;
+}
+
+// TODO: Switch to spdlog
+
+void ScriptManager::Script::scriptWorker(Script* script) {
+    if (duk_peval_string(script->ctx, script->code.c_str()) != 0) {
+        printf("Error: %s\n", duk_safe_to_string(script->ctx, -1));
+        //return;
+    }
+    duk_destroy_heap(script->ctx);
+    script->running = false;
+}
+
+void ScriptManager::bindScriptRunHandler(std::string name, ScriptManager::ScriptRunHandler_t handler) {
+    // TODO: check if it exists and add a "unbind" function
+    handlers[name] = handler;
+}
+
+duk_ret_t ScriptManager::duk_setSource(duk_context* dukCtx) {
+    const char* name = duk_require_string(dukCtx, -1);
+    sigpath::sourceManager.selectSource(name);
+
+    duk_pop_n(dukCtx, 1); // Pop demod name, this and context
+
+    return 0;
+}

core/src/scripting.h

@@ -0,0 +1,51 @@
+#pragma once
+#include <string>
+#include <thread>
+#include <vector>
+#include <map>
+#include <duktape/duktape.h>
+
+class ScriptManager {
+public:
+    ScriptManager();
+
+    friend class Script;
+
+    class Script {
+    public:
+        Script(ScriptManager* man, std::string name, std::string path);
+        void run();
+        bool running = false;
+
+    private:
+        static void scriptWorker(Script* _this);
+
+        duk_context* ctx;
+        std::thread worker;
+        std::string code;
+        std::string name;
+        
+
+        ScriptManager* manager;
+
+    };
+
+    struct ScriptRunHandler_t {
+        void (*handler)(void* ctx, duk_context* dukCtx, duk_idx_t objId);
+        void* ctx;
+    };
+
+    void bindScriptRunHandler(std::string name, ScriptManager::ScriptRunHandler_t handler);
+    ScriptManager::Script* createScript(std::string name, std::string path);
+
+    std::map<std::string, ScriptManager::Script*> scripts;
+
+private:
+    static duk_context* createContext(ScriptManager* _this, std::string name);
+
+    // API
+    static duk_ret_t duk_setSource(duk_context* ctx);
+
+    std::map<std::string, ScriptManager::ScriptRunHandler_t> handlers;
+
+};

core/src/signal_path/dsp.cpp

@@ -0,0 +1,111 @@
+#include <signal_path/dsp.h>
+
+SignalPath::SignalPath() {
+    
+}
+
+void SignalPath::init(uint64_t sampleRate, int fftRate, int fftSize, dsp::stream<dsp::complex_t>* input, dsp::complex_t* fftBuffer, void fftHandler(dsp::complex_t*,int,void*)) {
+    this->sampleRate = sampleRate;
+    this->fftRate = fftRate;
+    this->fftSize = fftSize;
+    inputBlockSize = sampleRate / 200.0f;
+
+    split.init(input);
+
+    reshape.init(&fftStream, fftSize, (sampleRate / fftRate) - fftSize);
+    split.bindStream(&fftStream);
+    fftHandlerSink.init(&reshape.out, fftHandler, NULL);
+}
+
+void SignalPath::setSampleRate(double sampleRate) {
+    this->sampleRate = sampleRate;
+
+    split.stop();
+
+    for (auto const& [name, vfo] : vfos) {
+        vfo.vfo->stop();
+    }
+
+    // Claculate skip to maintain a constant fft rate
+    int skip = (sampleRate / fftRate) - fftSize;
+    reshape.setSkip(skip);
+
+    // TODO: Tell modules that the block size has changed (maybe?)
+
+    for (auto const& [name, vfo] : vfos) {
+        vfo.vfo->setInSampleRate(sampleRate);
+        vfo.vfo->start();
+    }
+
+    split.start();
+}
+
+double SignalPath::getSampleRate() {
+    return sampleRate;
+}
+
+void SignalPath::start() {
+    split.start();
+    reshape.start();
+    fftHandlerSink.start();
+}
+
+void SignalPath::stop() {
+    split.stop();
+    reshape.stop();
+    fftHandlerSink.stop();
+}
+
+dsp::VFO* SignalPath::addVFO(std::string name, double outSampleRate, double bandwidth, double offset) {
+    if (vfos.find(name) != vfos.end()) {
+        return NULL;
+    }
+    VFO_t vfo;
+    vfo.inputStream = new dsp::stream<dsp::complex_t>;
+    split.bindStream(vfo.inputStream);
+    vfo.vfo = new dsp::VFO();
+    vfo.vfo->init(vfo.inputStream, offset, sampleRate, outSampleRate, bandwidth);
+    vfo.vfo->start();
+    vfos[name] = vfo;
+    return vfo.vfo;
+}
+
+void SignalPath::removeVFO(std::string name) {
+    if (vfos.find(name) == vfos.end()) {
+        return;
+    }
+    VFO_t vfo = vfos[name];
+    vfo.vfo->stop();
+    split.unbindStream(vfo.inputStream);
+    delete vfo.vfo;
+    delete vfo.inputStream;
+    vfos.erase(name);
+}
+
+void SignalPath::setInput(dsp::stream<dsp::complex_t>* input) {
+    split.setInput(input);
+}
+
+void SignalPath::bindIQStream(dsp::stream<dsp::complex_t>* stream) {
+    split.bindStream(stream);
+}
+
+void SignalPath::unbindIQStream(dsp::stream<dsp::complex_t>* stream) {
+    split.unbindStream(stream);
+}
+
+void SignalPath::setFFTSize(int size) {
+    fftSize = size;
+    int skip = (sampleRate / fftRate) - fftSize;
+    reshape.setSkip(skip);
+}
+
+void SignalPath::startFFT() {
+    reshape.start();
+    fftHandlerSink.start();
+}
+
+void SignalPath::stopFFT() {
+    reshape.stop();
+    fftHandlerSink.stop();
+}

core/src/signal_path/dsp.h

@@ -0,0 +1,44 @@
+#pragma once
+#include <dsp/routing.h>
+#include <dsp/vfo.h>
+#include <map>
+#include <dsp/sink.h>
+
+class SignalPath {
+public:
+    SignalPath();
+    void init(uint64_t sampleRate, int fftRate, int fftSize, dsp::stream<dsp::complex_t>* input, dsp::complex_t* fftBuffer, void fftHandler(dsp::complex_t*,int,void*));
+    void start();
+    void stop();
+    void setSampleRate(double sampleRate);
+    double getSampleRate();
+    dsp::VFO* addVFO(std::string name, double outSampleRate, double bandwidth, double offset);
+    void removeVFO(std::string name);
+    void setInput(dsp::stream<dsp::complex_t>* input);
+    void bindIQStream(dsp::stream<dsp::complex_t>* stream);
+    void unbindIQStream(dsp::stream<dsp::complex_t>* stream);
+    void setFFTSize(int size);
+    void startFFT();
+    void stopFFT();
+
+private:
+    struct VFO_t {
+        dsp::stream<dsp::complex_t>* inputStream;
+        dsp::VFO* vfo;
+    };
+
+    dsp::Splitter<dsp::complex_t> split;
+
+    // FFT
+    dsp::stream<dsp::complex_t> fftStream;
+    dsp::Reshaper<dsp::complex_t> reshape;
+    dsp::HandlerSink<dsp::complex_t> fftHandlerSink;
+
+    // VFO
+    std::map<std::string, VFO_t> vfos;
+
+    double sampleRate;
+    double fftRate;
+    int fftSize;
+    int inputBlockSize;
+};

core/src/signal_path/signal_path.cpp

@@ -0,0 +1,8 @@
+#include <signal_path/signal_path.h>
+
+namespace sigpath {
+    SignalPath signalPath;
+    VFOManager vfoManager;
+    SourceManager sourceManager;
+    SinkManager sinkManager;
+};

core/src/signal_path/signal_path.h

@@ -0,0 +1,13 @@
+#pragma once
+#include <signal_path/dsp.h>
+#include <signal_path/vfo_manager.h>
+#include <signal_path/source.h>
+#include <signal_path/sink.h>
+#include <new_module.h>
+
+namespace sigpath {
+    SDRPP_EXPORT SignalPath signalPath;
+    SDRPP_EXPORT VFOManager vfoManager;
+    SDRPP_EXPORT SourceManager sourceManager;
+    SDRPP_EXPORT SinkManager sinkManager;
+};

core/src/signal_path/sink.cpp

@@ -0,0 +1,313 @@
+#include <signal_path/sink.h>
+#include <spdlog/spdlog.h>
+#include <imgui/imgui.h>
+#include <gui/style.h>
+#include <gui/icons.h>
+#include <core.h>
+
+#define CONCAT(a, b) ((std::string(a) + b).c_str())
+
+SinkManager::SinkManager() {
+    SinkManager::SinkProvider prov;
+    prov.create = SinkManager::NullSink::create;
+    registerSinkProvider("None", prov);
+}
+
+SinkManager::Stream::Stream(dsp::stream<dsp::stereo_t>* in, const Event<float>::EventHandler& srChangeHandler, float sampleRate) {
+    init(in, srChangeHandler, sampleRate);
+}
+
+void SinkManager::Stream::init(dsp::stream<dsp::stereo_t>* in, const Event<float>::EventHandler& srChangeHandler, float sampleRate) {
+    _in = in;
+    srChange.bindHandler(srChangeHandler);
+    _sampleRate = sampleRate;
+    splitter.init(_in);
+    splitter.bindStream(&volumeInput);
+    volumeAjust.init(&volumeInput, 1.0f);
+    sinkOut = &volumeAjust.out;
+}
+
+void SinkManager::Stream::start() {
+    if (running) {
+        return;
+    }
+    
+    splitter.start();
+    volumeAjust.start();
+    sink->start();
+    running = true;
+}
+
+void SinkManager::Stream::stop() {
+    if (!running) {
+        return;
+    }
+    splitter.stop();
+    volumeAjust.stop();
+    sink->stop();
+    running = false;
+}
+
+void SinkManager::Stream::setVolume(float volume) {
+    guiVolume = volume;
+    volumeAjust.setVolume(volume);
+}
+
+float SinkManager::Stream::getVolume() {
+    return guiVolume;
+}
+
+float SinkManager::Stream::getSampleRate() {
+    return _sampleRate;
+}
+
+void SinkManager::Stream::setInput(dsp::stream<dsp::stereo_t>* in) {
+    std::lock_guard<std::mutex> lck(ctrlMtx);
+    _in = in;
+    splitter.setInput(_in);
+}
+
+dsp::stream<dsp::stereo_t>* SinkManager::Stream::bindStream() {
+    dsp::stream<dsp::stereo_t>* stream = new dsp::stream<dsp::stereo_t>;
+    splitter.bindStream(stream);
+    return stream;
+}
+
+void SinkManager::Stream::unbindStream(dsp::stream<dsp::stereo_t>* stream) {
+    splitter.unbindStream(stream);
+    delete stream;
+}
+
+void SinkManager::Stream::setSampleRate(float sampleRate) {
+    std::lock_guard<std::mutex> lck(ctrlMtx);
+    _sampleRate = sampleRate;
+    srChange.emit(sampleRate);
+}
+
+void SinkManager::registerSinkProvider(std::string name, SinkProvider provider) {
+    if (providers.find(name) != providers.end()) {
+        spdlog::error("Cannot create sink provider '{0}', this name is already taken", name);
+        return;
+    }
+    providers[name] = provider;
+    providerNames.push_back(name);
+}
+
+void SinkManager::registerStream(std::string name, SinkManager::Stream* stream) {
+    if (streams.find(name) != streams.end()) {
+        spdlog::error("Cannot register stream '{0}', this name is already taken", name);
+        return;
+    }
+
+    SinkManager::SinkProvider provider;
+
+    provider = providers["None"];
+
+    stream->sink = provider.create(stream, name, provider.ctx);
+
+    streams[name] = stream;
+    streamNames.push_back(name);
+}
+
+void SinkManager::unregisterStream(std::string name) {
+    if (streams.find(name) == streams.end()) {
+        spdlog::error("Cannot unregister stream '{0}', this stream doesn't exist", name);
+        return;
+    }
+    spdlog::error("unregisterStream NOT IMPLEMENTED!!!!!!!");
+    SinkManager::Stream* stream = streams[name];
+    delete stream->sink;
+    delete stream;
+}
+
+void SinkManager::startStream(std::string name) {
+    if (streams.find(name) == streams.end()) {
+        spdlog::error("Cannot start stream '{0}', this stream doesn't exist", name);
+        return;
+    }
+    streams[name]->start();
+}
+
+void SinkManager::stopStream(std::string name) {
+    if (streams.find(name) == streams.end()) {
+        spdlog::error("Cannot stop stream '{0}', this stream doesn't exist", name);
+        return;
+    }
+    streams[name]->stop();
+}
+
+float SinkManager::getStreamSampleRate(std::string name) {
+    if (streams.find(name) == streams.end()) {
+        spdlog::error("Cannot get sample rate of stream '{0}', this stream doesn't exist", name);
+        return -1.0f;
+    }
+    return streams[name]->getSampleRate();
+}
+
+dsp::stream<dsp::stereo_t>* SinkManager::bindStream(std::string name) {
+    if (streams.find(name) == streams.end()) {
+        spdlog::error("Cannot bind to stream '{0}'. Stream doesn't exist", name);
+        return NULL;
+    }
+    return streams[name]->bindStream();
+}
+
+void SinkManager::unbindStream(std::string name, dsp::stream<dsp::stereo_t>* stream) {
+    if (streams.find(name) == streams.end()) {
+        spdlog::error("Cannot unbind from stream '{0}'. Stream doesn't exist", name);
+        return;
+    }
+    streams[name]->unbindStream(stream);
+}
+
+void SinkManager::setStreamSink(std::string name, std::string providerName) {
+    spdlog::warn("setStreamSink is NOT implemented!!!");
+}
+
+void SinkManager::showVolumeSlider(std::string name, std::string prefix, float width, float btnHeight, int btwBorder, bool sameLine) {
+    // TODO: Replace map with some hashmap for it to be faster
+    float height = ImGui::GetTextLineHeightWithSpacing() + 2;
+    float sliderHeight = height;
+    if (btnHeight > 0) {
+        height = btnHeight;
+    }
+
+    float ypos = ImGui::GetCursorPosY();
+
+    if (streams.find(name) == streams.end() || name == "") {
+        float dummy = 0.0f;
+        style::beginDisabled();
+        ImGui::PushID(ImGui::GetID(("sdrpp_unmute_btn_" + name).c_str()));
+        ImGui::ImageButton(icons::MUTED, ImVec2(height, height), ImVec2(0, 0), ImVec2(1, 1), btwBorder);
+        ImGui::PopID();
+        ImGui::SameLine();
+        ImGui::SetNextItemWidth(width - height - 8);
+        ImGui::SetCursorPosY(ypos + ((height - sliderHeight) / 2.0f) + btwBorder);
+        ImGui::SliderFloat((prefix + name).c_str(), &dummy, 0.0f, 1.0f, "");
+        style::endDisabled();
+        if (sameLine) { ImGui::SetCursorPosY(ypos); }
+        return;
+    }
+
+    SinkManager::Stream* stream = streams[name];
+
+    if (stream->volumeAjust.getMuted()) {
+        ImGui::PushID(ImGui::GetID(("sdrpp_unmute_btn_" + name).c_str()));
+        if (ImGui::ImageButton(icons::MUTED, ImVec2(height, height), ImVec2(0, 0), ImVec2(1, 1), btwBorder)) {
+            stream->volumeAjust.setMuted(false);
+            core::configManager.aquire();
+            saveStreamConfig(name);
+            core::configManager.release(true);
+        }
+        ImGui::PopID();
+    }
+    else {
+        ImGui::PushID(ImGui::GetID(("sdrpp_mute_btn_" + name).c_str()));
+        if (ImGui::ImageButton(icons::UNMUTED, ImVec2(height, height), ImVec2(0, 0), ImVec2(1, 1), btwBorder)) {
+            stream->volumeAjust.setMuted(true);
+            core::configManager.aquire();
+            saveStreamConfig(name);
+            core::configManager.release(true);
+        }
+        ImGui::PopID();
+    }
+
+    ImGui::SameLine();
+
+    ImGui::SetNextItemWidth(width - height - 8);
+    ImGui::SetCursorPosY(ypos + ((height - sliderHeight) / 2.0f) + btwBorder);
+    if (ImGui::SliderFloat((prefix + name).c_str(), &stream->guiVolume, 0.0f, 1.0f, "")) {
+        stream->setVolume(stream->guiVolume);
+        core::configManager.aquire();
+        saveStreamConfig(name);
+        core::configManager.release(true);
+    }
+    if (sameLine) { ImGui::SetCursorPosY(ypos); }
+    //ImGui::SetCursorPosY(ypos);
+}
+
+void SinkManager::loadStreamConfig(std::string name) {
+    json conf = core::configManager.conf["streams"][name];
+    SinkManager::Stream* stream = streams[name];
+    std::string provName = conf["sink"];
+    if (providers.find(provName) == providers.end()) {
+        provName = providerNames[0];
+    }
+    if (stream->running) {
+        stream->sink->stop();
+    }
+    delete stream->sink;
+    SinkManager::SinkProvider prov = providers[provName];
+    stream->providerId = std::distance(providerNames.begin(), std::find(providerNames.begin(), providerNames.end(), provName));
+    stream->sink = prov.create(stream, name, prov.ctx);
+    if (stream->running) {
+        stream->sink->start();
+    }
+    stream->setVolume(conf["volume"]);
+    stream->volumeAjust.setMuted(conf["muted"]);
+}
+
+void SinkManager::saveStreamConfig(std::string name) {
+    SinkManager::Stream* stream = streams[name];
+    json conf;
+    conf["sink"] = providerNames[stream->providerId];
+    conf["volume"] = stream->getVolume();
+    conf["muted"] = stream->volumeAjust.getMuted();
+    core::configManager.conf["streams"][name] = conf;
+}
+
+// Note: aquire and release config before running this
+void SinkManager::loadSinksFromConfig() {
+    for (auto const& [name, stream] : streams) {
+        if (!core::configManager.conf["streams"].contains(name)) { continue; }
+        loadStreamConfig(name);
+    }
+}
+
+void SinkManager::showMenu() {
+    float menuWidth = ImGui::GetContentRegionAvailWidth();
+    int count = 0;
+    int maxCount = streams.size();
+    
+    std::string provStr = "";
+    for (auto const& name : providerNames) {
+        provStr += name;
+        provStr += '\0';
+    }
+
+    for (auto const& [name, stream] : streams) {
+        ImGui::SetCursorPosX((menuWidth / 2.0f) - (ImGui::CalcTextSize(name.c_str()).x / 2.0f));
+        ImGui::Text("%s", name.c_str());
+
+        ImGui::SetNextItemWidth(menuWidth);
+        if (ImGui::Combo(CONCAT("##_sdrpp_sink_select_", name), &stream->providerId, provStr.c_str())) {
+            if (stream->running) {
+                stream->sink->stop();
+            }
+            delete stream->sink;
+            SinkManager::SinkProvider prov = providers[providerNames[stream->providerId]];
+            stream->sink = prov.create(stream, name, prov.ctx);
+            if (stream->running) {
+                stream->sink->start();
+            }
+            core::configManager.aquire();
+            saveStreamConfig(name);
+            core::configManager.release(true);
+        }
+
+        stream->sink->menuHandler();
+
+        showVolumeSlider(name, "##_sdrpp_sink_menu_vol_", menuWidth);
+
+        count++;
+        if (count < maxCount) {
+            ImGui::Spacing();
+            ImGui::Separator();
+        }
+        ImGui::Spacing();
+    }
+}
+
+std::vector<std::string> SinkManager::getStreamNames() {
+    return streamNames;
+}

core/src/signal_path/sink.h

@@ -0,0 +1,121 @@
+#pragma once
+#include <map>
+#include <string>
+#include <dsp/stream.h>
+#include <dsp/types.h>
+#include <dsp/routing.h>
+#include <dsp/processing.h>
+#include <dsp/sink.h>
+#include <mutex>
+#include <event.h>
+#include <vector>
+
+class SinkManager {
+public:
+    SinkManager();
+
+    class Sink {
+    public:
+        virtual void start() = 0;
+        virtual void stop() = 0;
+        virtual void menuHandler() = 0;
+    };
+
+    class Stream {
+    public:
+        Stream() {}
+        Stream(dsp::stream<dsp::stereo_t>* in, const Event<float>::EventHandler& srChangeHandler, float sampleRate);
+
+        void init(dsp::stream<dsp::stereo_t>* in, const Event<float>::EventHandler& srChangeHandler, float sampleRate);
+
+        void start();
+        void stop();
+
+        void setVolume(float volume);
+        float getVolume();
+
+        void setSampleRate(float sampleRate);
+        float getSampleRate();
+
+        void setInput(dsp::stream<dsp::stereo_t>* in);
+
+        dsp::stream<dsp::stereo_t>* bindStream();
+        void unbindStream(dsp::stream<dsp::stereo_t>* stream);
+
+        friend SinkManager;
+        friend SinkManager::Sink;
+
+        dsp::stream<dsp::stereo_t>* sinkOut;
+
+        Event<float> srChange;        
+
+    private:
+        dsp::stream<dsp::stereo_t>* _in;
+        dsp::Splitter<dsp::stereo_t> splitter;
+        SinkManager::Sink* sink;
+        dsp::stream<dsp::stereo_t> volumeInput;
+        dsp::Volume<dsp::stereo_t> volumeAjust;
+        std::mutex ctrlMtx;
+        float _sampleRate;
+        int providerId = 0;
+        bool running = false;
+
+        float guiVolume = 1.0f;
+    };
+
+    struct SinkProvider {
+        SinkManager::Sink* (*create)(SinkManager::Stream* stream, std::string streamName, void* ctx);
+        void* ctx;
+    };
+
+    class NullSink : SinkManager::Sink {
+    public:
+        NullSink(SinkManager::Stream* stream) {
+            ns.init(stream->sinkOut);
+        }
+        void start() { ns.start(); }
+        void stop() { ns.stop(); }
+        void menuHandler() {}
+
+        static SinkManager::Sink* create(SinkManager::Stream* stream, std::string streamName, void* ctx) {
+            stream->srChange.emit(48000);
+            return new SinkManager::NullSink(stream);
+        }
+
+    private:
+        dsp::NullSink<dsp::stereo_t> ns;
+
+    };
+
+    void registerSinkProvider(std::string name, SinkProvider provider);
+
+    void registerStream(std::string name, Stream* stream);
+    void unregisterStream(std::string name);
+
+    void startStream(std::string name);
+    void stopStream(std::string name);
+
+    float getStreamSampleRate(std::string name);
+
+    void setStreamSink(std::string name, std::string providerName);
+
+    void showVolumeSlider(std::string name, std::string prefix, float width, float btnHeight = -1.0f, int btwBorder = 0, bool sameLine = false);
+
+    dsp::stream<dsp::stereo_t>* bindStream(std::string name);
+    void unbindStream(std::string name, dsp::stream<dsp::stereo_t>* stream);
+
+    void loadSinksFromConfig();
+    void showMenu();
+
+    std::vector<std::string> getStreamNames();
+
+private:
+    void loadStreamConfig(std::string name);
+    void saveStreamConfig(std::string name);
+
+    std::map<std::string, SinkProvider> providers;
+    std::map<std::string, Stream*> streams;
+    std::vector<std::string> providerNames;
+    std::vector<std::string> streamNames;
+
+};

core/src/signal_path/source.cpp

@@ -0,0 +1,64 @@
+#include <signal_path/source.h>
+#include <spdlog/spdlog.h>
+#include <signal_path/signal_path.h>
+
+SourceManager::SourceManager() {
+
+}
+
+void SourceManager::registerSource(std::string name, SourceHandler* handler) {
+    if (sources.find(name) != sources.end()) {
+        spdlog::error("Tried to register new source with existing name: {0}", name);
+        return;
+    }
+    sources[name] = handler;
+    sourceNames.push_back(name);
+}
+
+void SourceManager::selectSource(std::string  name) {
+    if (sources.find(name) == sources.end()) {
+        spdlog::error("Tried to select non existant source: {0}", name);
+        return;
+    }
+    if (selectedName != "") {
+        sources[selectedName]->deselectHandler(sources[selectedName]->ctx);
+    }
+    selectedHandler = sources[name];
+    selectedHandler->selectHandler(selectedHandler->ctx);
+    selectedName = name;
+    sigpath::signalPath.setInput(selectedHandler->stream);
+}
+
+void SourceManager::showSelectedMenu() {
+    if (selectedHandler == NULL) {
+        return;
+    }
+    selectedHandler->menuHandler(selectedHandler->ctx);
+}
+
+void SourceManager::start() {
+    if (selectedHandler == NULL) {
+        return;
+    }
+    selectedHandler->startHandler(selectedHandler->ctx);
+}
+
+void SourceManager::stop() {
+    if (selectedHandler == NULL) {
+        return;
+    }
+    selectedHandler->stopHandler(selectedHandler->ctx);
+}
+
+void SourceManager::tune(double freq) {
+    if (selectedHandler == NULL) {
+        return;
+    }
+    selectedHandler->tuneHandler(freq + tuneOffset, selectedHandler->ctx);
+    currentFreq = freq;
+}
+
+void SourceManager::setTuningOffset(double offset) {
+    tuneOffset = offset;
+    tune(currentFreq);
+}

core/src/signal_path/source.h

@@ -0,0 +1,40 @@
+#pragma once
+#include <string>
+#include <vector>
+#include <map>
+#include <dsp/stream.h>
+#include <dsp/types.h>
+
+class SourceManager {
+public:
+    SourceManager();
+
+    struct SourceHandler {
+        dsp::stream<dsp::complex_t>* stream;
+        void (*menuHandler)(void* ctx);
+        void (*selectHandler)(void* ctx);
+        void (*deselectHandler)(void* ctx);
+        void (*startHandler)(void* ctx);
+        void (*stopHandler)(void* ctx);
+        void (*tuneHandler)(double freq, void* ctx);
+        void* ctx;
+    };
+
+    void registerSource(std::string name, SourceHandler* handler);
+    void selectSource(std::string  name);
+    void showSelectedMenu();
+    void start();
+    void stop();
+    void tune(double freq);
+    void setTuningOffset(double offset);
+
+    std::vector<std::string> sourceNames;
+
+private:
+    std::map<std::string, SourceHandler*> sources;
+    std::string selectedName;
+    SourceHandler* selectedHandler = NULL;
+    double tuneOffset;
+    double currentFreq;
+
+};

core/src/signal_path/vfo_manager.cpp

@@ -0,0 +1,136 @@
+#include <signal_path/vfo_manager.h>
+#include <signal_path/signal_path.h>
+
+VFOManager::VFO::VFO(std::string name, int reference, double offset, double bandwidth, double sampleRate, int blockSize) {
+    this->name = name;
+    dspVFO = sigpath::signalPath.addVFO(name, sampleRate, bandwidth, offset);
+    wtfVFO = new ImGui::WaterfallVFO;
+    wtfVFO->setReference(reference);
+    wtfVFO->setBandwidth(bandwidth);
+    wtfVFO->setOffset(offset);
+    output = dspVFO->out;
+    gui::waterfall.vfos[name] = wtfVFO;
+}
+
+VFOManager::VFO::~VFO() {
+    dspVFO->stop();
+    gui::waterfall.vfos.erase(name);
+    if (gui::waterfall.selectedVFO == name) {
+        gui::waterfall.selectFirstVFO();
+    }
+    sigpath::signalPath.removeVFO(name);
+    delete wtfVFO;
+}
+
+void VFOManager::VFO::setOffset(double offset) {
+    wtfVFO->setOffset(offset);
+    dspVFO->setOffset(wtfVFO->centerOffset);
+}
+
+void VFOManager::VFO::setCenterOffset(double offset) {
+    wtfVFO->setCenterOffset(offset);
+    dspVFO->setOffset(offset);
+}
+
+void VFOManager::VFO::setBandwidth(double bandwidth) {
+    wtfVFO->setBandwidth(bandwidth);
+    dspVFO->setBandwidth(bandwidth);
+}
+
+void VFOManager::VFO::setSampleRate(double sampleRate, double bandwidth) {
+    dspVFO->setOutSampleRate(sampleRate, bandwidth);
+    wtfVFO->setBandwidth(bandwidth);
+}
+
+void VFOManager::VFO::setReference(int ref) {
+    wtfVFO->setReference(ref);
+}
+
+int VFOManager::VFO::getOutputBlockSize() {
+    // NOTE: This shouldn't be needed anymore
+    return 1; //dspVFO->getOutputBlockSize();
+}
+
+void VFOManager::VFO::setSnapInterval(double interval) {
+    wtfVFO->setSnapInterval(interval);
+}
+
+
+VFOManager::VFOManager() {
+    
+}
+
+VFOManager::VFO* VFOManager::createVFO(std::string name, int reference, double offset, double bandwidth, double sampleRate, int blockSize) {
+    if (vfos.find(name) != vfos.end() || name == "") {
+        return NULL;
+    }
+    VFOManager::VFO* vfo = new VFO(name, reference, offset, bandwidth, sampleRate, blockSize);
+    vfos[name] = vfo;
+    return vfo;
+}
+
+void VFOManager::deleteVFO(VFOManager::VFO* vfo) {
+    std::string name = "";
+    for (auto const& [_name, _vfo] : vfos) {
+        if (_vfo == vfo) {
+            name = _name;
+            break;
+        }
+    }
+    if (name == "") {
+        return;
+    }
+    vfos.erase(name);
+    delete vfo;
+}
+
+void VFOManager::setOffset(std::string name, double offset) {
+    if (vfos.find(name) == vfos.end()) {
+        return;
+    }
+    vfos[name]->setOffset(offset);
+}
+
+void VFOManager::setCenterOffset(std::string name, double offset) {
+    if (vfos.find(name) == vfos.end()) {
+        return;
+    }
+    vfos[name]->setCenterOffset(offset);
+}
+
+void VFOManager::setBandwidth(std::string name, double bandwidth) {
+    if (vfos.find(name) == vfos.end()) {
+        return;
+    }
+    vfos[name]->setBandwidth(bandwidth);
+}
+
+void VFOManager::setSampleRate(std::string name, double sampleRate, double bandwidth) {
+    if (vfos.find(name) == vfos.end()) {
+        return;
+    }
+    vfos[name]->setSampleRate(sampleRate, bandwidth);
+}
+
+void VFOManager::setReference(std::string name, int ref) {
+    if (vfos.find(name) == vfos.end()) {
+        return;
+    }
+    vfos[name]->setReference(ref);
+}
+
+int VFOManager::getOutputBlockSize(std::string name) {
+    if (vfos.find(name) == vfos.end()) {
+        return -1;
+    }
+    return vfos[name]->getOutputBlockSize();
+}
+
+void VFOManager::updateFromWaterfall(ImGui::WaterFall* wtf) {
+    for (auto const& [name, vfo] : vfos) {
+        if (vfo->wtfVFO->centerOffsetChanged) {
+            vfo->wtfVFO->centerOffsetChanged = false;
+            vfo->dspVFO->setOffset(vfo->wtfVFO->centerOffset);
+        }
+    }
+}

core/src/signal_path/vfo_manager.h

@@ -0,0 +1,48 @@
+#pragma once
+#include <dsp/vfo.h>
+#include <gui/widgets/waterfall.h>
+#include <gui/gui.h>
+
+class VFOManager {
+public:
+    VFOManager();
+
+    class VFO {
+    public:
+        VFO(std::string name, int reference, double offset, double bandwidth, double sampleRate, int blockSize);
+        ~VFO();
+
+        void setOffset(double offset);
+        void setCenterOffset(double offset);
+        void setBandwidth(double bandwidth);
+        void setSampleRate(double sampleRate, double bandwidth);
+        void setReference(int ref);
+        int getOutputBlockSize();
+        void setSnapInterval(double interval);
+
+        dsp::stream<dsp::complex_t>* output;
+
+        friend class VFOManager;
+
+    private:
+        std::string name;
+        dsp::VFO* dspVFO;
+        ImGui::WaterfallVFO* wtfVFO;
+        
+    };
+
+    VFOManager::VFO* createVFO(std::string name, int reference, double offset, double bandwidth, double sampleRate, int blockSize);
+    void deleteVFO(VFOManager::VFO* vfo);
+
+    void setOffset(std::string name, double offset);
+    void setCenterOffset(std::string name, double offset);
+    void setBandwidth(std::string name, double bandwidth);
+    void setSampleRate(std::string name, double sampleRate, double bandwidth);
+    void setReference(std::string name, int ref);
+    int getOutputBlockSize(std::string name);
+
+    void updateFromWaterfall(ImGui::WaterFall* wtf);
+
+private:
+    std::map<std::string, VFO*> vfos;
+};