copy core from metabalus

CMakeLists.txt

@@ -40,8 +40,13 @@ find_package(Qt6 REQUIRED COMPONENTS
 qt_standard_project_setup()
 
 add_library(sonobulus_core STATIC
-    src/synth/AudioEngine.cpp
+    src/ConfigService.cpp
+    src/LoggerService.cpp
     src/TimerComponent.cpp
+    src/synth/AudioEngine.cpp
+    src/synth/KeyboardController.cpp
+    src/synth/MidiController.cpp
+    src/synth/NoteQueue.cpp
 )
 target_link_libraries(sonobulus_core PRIVATE
     Qt6::Core
@@ -50,10 +55,10 @@ target_link_libraries(sonobulus_core PRIVATE
     rtmidi
 )
 
-message(STATUS "Looking for compiler dependencies: ${rtaudio_SOURCE_DIR}...")
-
 target_include_directories(sonobulus_core PRIVATE 
+    ${CMAKE_SOURCE_DIR}/src/
     ${rtaudio_SOURCE_DIR}
+    ${rtmidi_SOURCE_DIR}
 )
 
 qt_add_executable(sonobulus
@@ -68,6 +73,7 @@ qt_add_qml_module(sonobulus
 
 target_include_directories(sonobulus PRIVATE 
     ${rtaudio_SOURCE_DIR}
+    ${rtmidi_SOURCE_DIR}
 )
 
 target_link_libraries(sonobulus PRIVATE

src/ConfigService.hpp

@@ -0,0 +1,6 @@
+
+#pragma once
+
+class ConfigService {
+
+};

src/synth/KeyboardController.cpp

@@ -1,2 +1,67 @@
 
 #include "KeyboardController.hpp"
+
+#include <iostream>
+// #include <yaml-cpp/yaml.h>
+#include <filesystem>
+
+KeyboardController::KeyboardController(NoteQueue& queue, ConfigService* config) : queue_(queue), config_(config) {
+
+    // load keymap from config file
+    std::string filepath = "config/keymap.yaml";
+    filepath = std::filesystem::absolute(filepath).string();
+    // YAML::Node file;
+    try {
+    //    file = YAML::LoadFile(filepath);
+    } catch(const std::exception& e) {
+        std::cerr << e.what() << std::endl;
+        return;
+    }
+
+    // YAML::Node keymapNode = file["keymap"]; // node for string to string mappings
+    // YAML::Node notesNode = file["notes"]; // string to midi int mappings
+    // YAML::Node keysNode = file["keys"]; // string to qt key id mappings
+
+    // for each element in the keymap
+    // for (const auto& entry : keymapNode) {
+
+    //     std::string keyString = entry.first.as<std::string>();
+    //     std::string noteString = entry.second.as<std::string>();
+
+    //     // match the strings to ints 
+    //     uint8_t noteValue = notesNode[noteString].as<uint8_t>();
+    //     uint32_t keyValue = keysNode[keyString].as<uint32_t>();
+
+    //     // insert into map
+    //     keymap_.emplace(keyValue, noteValue);
+    // }
+
+}
+
+void KeyboardController::handleKeyPress(QKeyEvent* e) {
+    if (e->isAutoRepeat()) return;
+
+    auto it = keymap_.find(e->key());
+    if (it == keymap_.end()) return;
+
+    queue_.push({
+        NoteEventType::NoteOn,
+        it->second,
+        0.8f,
+        std::chrono::high_resolution_clock::now()
+    });
+}
+
+void KeyboardController::handleKeyRelease(QKeyEvent* e) {
+    if (e->isAutoRepeat()) return;
+
+    auto it = keymap_.find(e->key());
+    if (it == keymap_.end()) return;
+
+    queue_.push({
+        NoteEventType::NoteOff,
+        it->second,
+        0.8f,
+        std::chrono::high_resolution_clock::now()
+    });
+}

src/synth/KeyboardController.hpp

@@ -1,2 +1,29 @@
 
 // the keyboard controller acts as an instrument input device for creating note events from a computer keyboard
+#pragma once
+
+#include <QKeyEvent>
+#include <unordered_map>
+
+#include "NoteQueue.hpp"
+#include "ConfigService.hpp"
+
+// The keyboardcontroller handles user inputs from a keyboard and maps them to note events
+class KeyboardController {
+
+public:
+    explicit KeyboardController(NoteQueue& queue, ConfigService* config);
+    ~KeyboardController() = default;
+
+    void handleKeyPress(QKeyEvent* e);
+    void handleKeyRelease(QKeyEvent* e);
+
+private:
+
+    NoteQueue& queue_;
+    ConfigService* config_;
+
+    // keymap is key -> midi note id
+    std::unordered_map<int32_t, uint8_t> keymap_;
+
+};

src/synth/MidiController.cpp

@@ -1,2 +1,137 @@
 
 #include "MidiController.hpp"
+
+#include <iostream>
+#include <chrono>
+
+MidiController::MidiController(NoteQueue& queue) : noteQueue_(queue) {
+    try {
+        midiIn_ = std::make_unique<RtMidiIn>(RtMidi::LINUX_ALSA);
+        midiIn_->ignoreTypes(false, false, false);
+    } catch (RtMidiError& e) {
+        std::cout << "RtMidi init failed: " << e.getMessage() << std::endl;
+    }
+    // TODO: this still doesnt work on windows
+}
+
+MidiController::~MidiController() {
+    close();
+}
+
+// open the first for thats successful
+bool MidiController::openDefaultPort() {
+    if (!midiIn_) return false;
+    if (midiIn_->getPortCount() == 0) {
+        std::cout << "No MIDI input ports available" << std::endl;
+        return false;
+    }
+
+    uint32_t portCount = midiIn_->getPortCount();
+    std::cout << "Available MidiIn ports: " << portCount << std::endl;
+    for (int i = 0; i < portCount; i++) {
+        std::cout << "#" << i << " : " << midiIn_->getPortName(i) << std::endl;
+
+        if(openPort(i)) return true;
+    }
+
+    return false;
+}
+
+bool MidiController::openPort(unsigned int index) {
+    if (!midiIn_) return false;
+
+    try {
+        midiIn_->openPort(index);
+        midiIn_->setCallback(&MidiController::midiCallback, this);
+        std::cout << "Opened MIDI port: " << midiIn_->getPortName(index) << std::endl;
+        return true;
+    } catch (RtMidiError& e) {
+        std::cout << "Midi Port error" << std::endl;
+        std::cerr << e.getMessage() << std::endl;
+        return false;
+    }
+}
+
+void MidiController::close() {
+    if (midiIn_ && midiIn_->isPortOpen()) {
+        midiIn_->closePort();
+    }
+}
+
+// called by RtMidi on receive of a midi message. deltaTime is time since last midi message, not useful atm
+void MidiController::midiCallback(double /*deltaTime*/, std::vector<unsigned char>* message, void* userData) {
+    auto* self = static_cast<MidiController*>(userData);
+    if (!message || message->empty()) return;
+    self->handleMessage(*message); // pass to parsing function if valid
+}
+
+void MidiController::handleMessage(const std::vector<unsigned char>& msg) {
+
+    if(msg.size() <= 1) return; // msg doesn't contain useful note info
+
+    uint8_t status = msg[0] & 0xF0;
+    uint8_t data1 = msg[1];
+    uint8_t data2 = msg[2];
+
+    if(status == 0xFE) return; // "Active Sensing" -> 300ms heartbeat. could be useful to sense if this is missing for device failure detection
+    if(status == 0xF8) return; // "Timing Clock" -> 24 pulses per quarter note, for steady rhythm. not useful for this instrument
+
+    // sustain pedal message event
+    if(status == 0xB0 && data1 == 64) {
+        handleSustain(data2 >= 64);
+        return;
+    }
+
+    unsigned char note = msg.size() > 1 ? msg[1] : 0; // note number
+    unsigned char vel = msg.size() > 2 ? msg[2] : 0; // velocity
+
+    // note on (velocity > 0)
+    if (status == 0x90 && vel > 0) {
+        noteOn(note, vel);
+    }
+    // note off (or note on with 0 velocity)
+    else if (status == 0x80 || (status == 0x90 && vel == 0)) {
+        noteOff(note);
+    }
+
+}
+
+// construct note on event and add to noteQueue
+void MidiController::noteOn(uint8_t note, uint8_t vel) {
+    sustainedNotes_.erase(note);
+
+    noteQueue_.push({
+        NoteEventType::NoteOn,
+        static_cast<uint8_t>(note),
+        vel / 127.0f,
+        std::chrono::high_resolution_clock::now()
+    });
+}
+
+// add note off event to noteQueue if no sustain active
+void MidiController::noteOff(uint8_t note) {
+    if(sustainDown_) {
+        sustainedNotes_.insert(note);
+        return;
+    }
+    noteQueue_.push({
+        NoteEventType::NoteOff,
+        static_cast<uint8_t>(note),
+        0.0f,
+        std::chrono::high_resolution_clock::now()
+    });
+}
+
+// if sustain goes from on->off, then noteOff all the active ntoes
+void MidiController::handleSustain(bool down) {
+    if(down == sustainDown_) return;
+
+    sustainDown_ = down;
+
+    if(!sustainDown_) {
+        for(uint8_t note : sustainedNotes_) {
+            noteOff(note);
+        }
+        sustainedNotes_.clear();
+    }
+}

src/synth/MidiController.hpp

@@ -1,2 +1,35 @@
 
 // the midi controller handles interfacing a stream from a midi input device and processing them into note events for the synthesizer
+#pragma once
+
+#include <RtMidi.h>
+#include <memory>
+#include "NoteQueue.hpp"
+#include <unordered_set>
+
+class MidiController {
+public:
+
+    MidiController(NoteQueue& queue);
+    ~MidiController();
+
+    bool openDefaultPort();
+    bool openPort(unsigned int index);
+    void close();
+
+private:
+
+    static void midiCallback(double deltaTime, std::vector<unsigned char>* message, void* userData);
+
+    void handleMessage(const std::vector<unsigned char>& msg);
+    void handleSustain(bool down);
+    void noteOn(uint8_t note, uint8_t vel);
+    void noteOff(uint8_t note);
+
+    std::unique_ptr<RtMidiIn> midiIn_;
+    NoteQueue& noteQueue_;
+
+    bool sustainDown_ = false;
+    std::unordered_set<uint8_t> sustainedNotes_;
+
+};

src/synth/NoteQueue.cpp

@@ -1,2 +1,28 @@
 
 #include "NoteQueue.hpp"
+#include <iostream>
+
+// add event to noteQueue, called by MidiController or keyboardController
+bool NoteQueue::push(const NoteEvent& event) {
+    size_t head = head_.load(std::memory_order_relaxed);
+    size_t next = (head + 1) % SYNTH_NOTE_QUEUE_SIZE;
+
+    if(next == tail_.load(std::memory_order_relaxed)) return false; // full
+
+    buffer_[head] = event;
+    head_.store(next, std::memory_order_relaxed);
+
+    return true;
+}
+
+// take event from noteQueue, called by synth
+bool NoteQueue::pop(NoteEvent& event) {
+    size_t tail = tail_.load(std::memory_order_relaxed);
+
+    if(tail == head_.load(std::memory_order_acquire)) return false; // empty
+
+    event = buffer_[tail];
+    tail_.store((tail + 1) % SYNTH_NOTE_QUEUE_SIZE, std::memory_order_release);
+
+    return true;
+}

src/synth/NoteQueue.hpp

@@ -1,2 +1,39 @@
 
 // the note queue is a wrapper for a FIFO array to which the midi/keyboard controller enters note events into and the synthesizer consumes from
+#pragma once
+
+#include <array>
+#include <atomic>
+#include <cstdint>
+#include <chrono>
+
+#define SYNTH_NOTE_QUEUE_SIZE 128
+
+enum class NoteEventType {
+    NoteOn,
+    NoteOff
+};
+
+struct NoteEvent {
+    NoteEventType type; // noteOn or noteOff
+    uint8_t note; // 0-128, a keyboard goes 0-87
+    float velocity; // 0-1, from a midi instrument its 0-127 though
+    std::chrono::time_point<std::chrono::high_resolution_clock> timestamp;
+};
+
+class NoteQueue {
+
+public:
+    NoteQueue() = default;
+    ~NoteQueue() = default;
+
+    bool push(const NoteEvent& event);
+    bool pop(NoteEvent& event);
+
+private:
+    
+    std::array<NoteEvent, SYNTH_NOTE_QUEUE_SIZE> buffer_;
+    std::atomic<size_t> head_{ 0 };
+    std::atomic<size_t> tail_{ 0 };
+
+};