plugin: add cava provider

nix/default.nix

@@ -22,6 +22,7 @@
   qt6,
   quickshell,
   aubio,
+  libcava,
   xkeyboard-config,
   cmake,
   ninja,
@@ -86,7 +87,7 @@
     };
 
     nativeBuildInputs = [cmake ninja pkg-config];
-    buildInputs = [qt6.qtbase qt6.qtdeclarative qt6.qtmultimedia libqalculate aubio];
+    buildInputs = [qt6.qtbase qt6.qtdeclarative qt6.qtmultimedia libqalculate aubio libcava];
 
     dontWrapQtApps = true;
     cmakeFlags =

plugin/src/Caelestia/CMakeLists.txt

@@ -1,6 +1,7 @@
 find_package(PkgConfig REQUIRED)
 pkg_check_modules(QALCULATE REQUIRED libqalculate)
 pkg_check_modules(AUBIO REQUIRED aubio)
+pkg_check_modules(CAVA REQUIRED cava)
 
 qt_add_qml_module(caelestia
     URI Caelestia
@@ -14,6 +15,7 @@ qt_add_qml_module(caelestia
         service.hpp service.cpp
         serviceref.hpp serviceref.cpp
         audioprovider.hpp audioprovider.cpp
+        cavaprovider.hpp cavaprovider.cpp
 )
 
 qt_query_qml_module(caelestia
@@ -33,8 +35,10 @@ install(TARGETS "${module_plugin_target}" LIBRARY DESTINATION "${module_dir}" RU
 install(FILES "${module_qmldir}" DESTINATION "${module_dir}")
 install(FILES "${module_typeinfo}" DESTINATION "${module_dir}")
 
-target_include_directories(caelestia SYSTEM PRIVATE ${QALCULATE_INCLUDE_DIRS} ${AUBIO_INCLUDE_DIRS})
+target_include_directories(caelestia SYSTEM PRIVATE
+    ${QALCULATE_INCLUDE_DIRS} ${AUBIO_INCLUDE_DIRS} ${CAVA_INCLUDE_DIRS}
+)
 target_link_libraries(caelestia PRIVATE
     Qt::Core Qt::Qml Qt::Gui Qt::Concurrent Qt::Multimedia
-    ${QALCULATE_LIBRARIES} ${AUBIO_LIBRARIES}
+    ${QALCULATE_LIBRARIES} ${AUBIO_LIBRARIES} ${CAVA_LIBRARIES}
 )

plugin/src/Caelestia/cavaprovider.cpp

@@ -0,0 +1,140 @@
+#include "cavaprovider.hpp"
+
+#include "audioprovider.hpp"
+#include <QDebug>
+#include <QObject>
+#include <cava/cavacore.h>
+#include <cmath>
+#include <cstddef>
+
+namespace caelestia {
+
+CavaProcessor::CavaProcessor(AudioProvider* provider, QObject* parent)
+    : AudioProcessor(provider, parent)
+    , m_plan(nullptr)
+    , m_in(new double[static_cast<size_t>(m_chunkSize)])
+    , m_out(nullptr)
+    , m_bars(0) {};
+
+CavaProcessor::~CavaProcessor() {
+    cleanup();
+    delete[] m_in;
+}
+
+void CavaProcessor::setBars(int bars) {
+    if (bars < 0) {
+        qWarning() << "CavaProcessor::setBars: bars must be greater than 0. Setting to 0.";
+        bars = 0;
+    }
+
+    if (m_bars != bars) {
+        m_bars = bars;
+        reload();
+    }
+}
+
+void CavaProcessor::reload() {
+    cleanup();
+    initCava();
+}
+
+void CavaProcessor::cleanup() {
+    if (!m_plan) {
+        return;
+    }
+
+    cava_destroy(m_plan);
+    m_plan = nullptr;
+
+    if (m_out) {
+        delete[] m_out;
+        m_out = nullptr;
+    }
+}
+
+void CavaProcessor::initCava() {
+    if (m_plan || m_bars == 0) {
+        return;
+    }
+
+    m_plan = cava_init(m_bars, static_cast<unsigned int>(m_sampleRate), 1, 1, 0.85, 50, 10000);
+
+    if (m_plan->status == -1) {
+        qWarning() << "CavaProcessor::initCava: failed to initialise cava plan";
+        cleanup();
+        return;
+    }
+
+    m_out = new double[static_cast<size_t>(m_bars)];
+}
+
+void CavaProcessor::processChunk(const QVector<double>& chunk) {
+    if (!m_plan || m_bars == 0) {
+        return;
+    }
+
+    std::copy(chunk.constBegin(), chunk.constEnd(), m_in);
+
+    // Process in data via cava
+    cava_execute(m_in, m_chunkSize, m_out, m_plan);
+
+    // Apply monstercat filter
+    for (int i = 0; i < m_bars; i++) {
+        for (int j = i - 1; j >= 0; j--) {
+            m_out[j] = std::max(m_out[i] / std::pow(1.5, i - j), m_out[j]);
+        }
+        for (int j = i + 1; j < m_bars; j++) {
+            m_out[j] = std::max(m_out[i] / std::pow(1.5, j - i), m_out[j]);
+        }
+    }
+
+    // Update values
+    QVector<double> values(m_bars);
+    std::copy(m_out, m_out + m_bars, values.begin());
+    if (values != m_values) {
+        m_values = std::move(values);
+        emit valuesChanged(m_values);
+    }
+}
+
+CavaProvider::CavaProvider(int sampleRate, int chunkSize, QObject* parent)
+    : AudioProvider(sampleRate, chunkSize, parent)
+    , m_bars(0) {
+    m_processor = new CavaProcessor(this);
+    init();
+
+    connect(static_cast<CavaProcessor*>(m_processor), &CavaProcessor::valuesChanged, this, &CavaProvider::updateValues);
+}
+
+int CavaProvider::bars() const {
+    return m_bars;
+}
+
+void CavaProvider::setBars(int bars) {
+    if (bars < 0) {
+        qWarning() << "CavaProvider::setBars: bars must be greater than 0. Setting to 0.";
+        bars = 0;
+    }
+
+    if (m_bars == bars) {
+        return;
+    }
+
+    m_bars = bars;
+    emit barsChanged();
+
+    QMetaObject::invokeMethod(m_processor, "setBars", Qt::QueuedConnection, Q_ARG(int, bars));
+}
+
+QVector<double> CavaProvider::values() const {
+    return m_values;
+}
+
+void CavaProvider::updateValues(QVector<double> values) {
+    if (values != m_values) {
+        m_values = std::move(values);
+        emit valuesChanged();
+    }
+}
+
+} // namespace caelestia

plugin/src/Caelestia/cavaprovider.hpp

@@ -0,0 +1,64 @@
+#pragma once
+
+#include "audioprovider.hpp"
+#include <QObject>
+#include <cava/cavacore.h>
+#include <qqmlintegration.h>
+
+namespace caelestia {
+
+class CavaProcessor : public AudioProcessor {
+    Q_OBJECT
+
+public:
+    explicit CavaProcessor(AudioProvider* provider, QObject* parent = nullptr);
+    ~CavaProcessor();
+
+signals:
+    void valuesChanged(QVector<double> values);
+
+private:
+    struct cava_plan* m_plan;
+    double* m_in;
+    double* m_out;
+
+    int m_bars;
+    QVector<double> m_values;
+
+    Q_INVOKABLE void setBars(int bars);
+
+    void reload();
+    void initCava();
+    void cleanup();
+
+    void processChunk(const QVector<double>& chunk) override;
+};
+
+class CavaProvider : public AudioProvider {
+    Q_OBJECT
+    QML_ELEMENT
+
+    Q_PROPERTY(int bars READ bars WRITE setBars NOTIFY barsChanged)
+
+    Q_PROPERTY(QVector<double> values READ values NOTIFY valuesChanged)
+
+public:
+    explicit CavaProvider(int sampleRate = 48000, int chunkSize = 512, QObject* parent = nullptr);
+
+    [[nodiscard]] int bars() const;
+    void setBars(int bars);
+
+    [[nodiscard]] QVector<double> values() const;
+
+signals:
+    void barsChanged();
+    void valuesChanged();
+
+private:
+    int m_bars;
+    QVector<double> m_values;
+
+    void updateValues(QVector<double> values);
+};
+
+} // namespace caelestia