feat: initial fft spectrum visualization support

The final goal is actually still clone ShadowPlayer's spectrum
visualization, tho.

.editorconfig

@@ -0,0 +1,7 @@
+[*]
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+indent_style = space
+indent_size = 4

.github/workflows/windows.yml

@@ -7,9 +7,11 @@ jobs:
   
     strategy:
       matrix:
-        vs: ['2022']
+        include:
-        msvc_arch: ['x64']
+          - qt_ver: '6.8.0'
-        qt_ver: ['6.7.3']
+            vs: '2022'
+            aqt_arch: 'win64_msvc2022_64'
+            msvc_arch: 'x64'
 
     runs-on: windows-2022
 
@@ -18,9 +20,9 @@ jobs:
     - name: Install Qt
       uses: jurplel/install-qt-action@v4
       with:
-        arch: 'win64_msvc2019_64'
+        arch: ${{ matrix.aqt_arch }}
         version: ${{ matrix.qt_ver }}
-        modules: 'qtmultimedia'
+        modules: 'qtmultimedia qt5compat'
     - name: Build
       shell: cmd
       run: |
@@ -33,30 +35,31 @@ jobs:
         :: ------ dep ------
         set CMAKE_PREFIX_PATH=%PWD%/dependencies_bin
         mkdir dependencies_src
-        :: ===== uchardet =====
+        :: ===== ECM =====
-        echo ::group::build uchardet
+        git clone -q https://invent.kde.org/frameworks/extra-cmake-modules.git dependencies_src/extra-cmake-modules
-        git clone -q https://gitlab.freedesktop.org/BLumia/uchardet.git --branch msvc dependencies_src/uchardet
+        cmake .\dependencies_src\extra-cmake-modules -Bbuild_dependencies/extra-cmake-modules -DCMAKE_INSTALL_PREFIX="dependencies_bin" -DBUILD_TESTING=OFF || goto :error
-        cmake .\dependencies_src\uchardet -Bbuild_dependencies/uchardet -DBUILD_BINARY=OFF -DCMAKE_INSTALL_PREFIX="dependencies_bin" || goto :error
+        cmake --build build_dependencies/extra-cmake-modules --config Release --target=install || goto :error
-        cmake --build build_dependencies/uchardet --config Release --target=install -j || goto :error
+        :: ===== Gperf (required by KCodecs) =====
-        echo ::endgroup::
+        choco install gperf
-        :: ===== pkg-config =====
+        :: ===== KCodecs =====
-        choco install pkgconfiglite
+        git clone -q https://invent.kde.org/frameworks/kcodecs.git dependencies_src/kcodecs
-        set PKG_CONFIG_PATH=%PWD%/dependencies_bin/lib/pkgconfig
+        cmake .\dependencies_src\kcodecs -Bbuild_dependencies/kcodecs -DCMAKE_INSTALL_PREFIX="dependencies_bin" -DBUILD_TESTING=OFF || goto :error
+        cmake --build build_dependencies/kcodecs --config Release --target=install || goto :error
         :: ===== taglib =====
         git clone --recurse-submodules -q https://github.com/taglib/taglib.git dependencies_src/taglib
         cmake .\dependencies_src\taglib -Bbuild_dependencies/taglib -DBUILD_SHARED_LIBS=ON -DCMAKE_INSTALL_PREFIX="dependencies_bin" || goto :error
         cmake --build build_dependencies/taglib --config Release --target=install -j || goto :error
         :: ------ app ------
-        cmake -Bbuild . -DCMAKE_INSTALL_PREFIX="%PWD%\build\" || goto :error
+        cmake -Bbuild . -DUSE_QTEXTCODEC=ON -DCMAKE_INSTALL_PREFIX="%PWD%\build\" || goto :error
         cmake --build build --config Release -j || goto :error
-        cmake --build build --config Release --target=install
+        cmake --build build --config Release --target=install || goto :error
         :: ------ pkg ------
-        windeployqt --verbose=2 --no-quick-import --no-translations --no-opengl-sw --no-system-d3d-compiler --no-system-dxc-compiler --multimedia --skip-plugin-types tls,networkinformation build\bin\pmusic.exe
+        windeployqt --verbose=2 --no-quick-import --no-translations --no-opengl-sw --no-system-d3d-compiler --no-system-dxc-compiler --multimedia --core5compat --skip-plugin-types tls,networkinformation build\bin\pmusic.exe
         robocopy ./dependencies_bin/bin build/bin *.dll
         if ErrorLevel 8 (exit /B 1)
         copy LICENSE build/bin/
         exit /B 0
     - uses: actions/upload-artifact@v4
       with:
-        name: "windows-msvc${{ matrix.vs }}-qt${{ matrix.qt_ver }}-cmake-package"
+        name: "${{ matrix.aqt_arch }}-qt${{ matrix.qt_ver }}-cmake-package"
         path: build/bin/*

CMakeLists.txt

@@ -3,7 +3,8 @@ cmake_minimum_required(VERSION 3.12)
 project(pineapple-music LANGUAGES CXX)
 
 include (GNUInstallDirs)
-include (FeatureSummary)
+include (FeatureSummary)
+include(FetchContent)
 
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
 
@@ -14,13 +15,26 @@ set(CMAKE_AUTORCC ON)
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-find_package(Qt6 6.6 COMPONENTS Widgets Multimedia Network LinguistTools REQUIRED)
+option(USE_QTEXTCODEC "Use QTextCodec instead of QStringConverter, in case Qt is not built with ICU" OFF)
-find_package(uchardet)
-find_package(PkgConfig)
 
-if (PKG_CONFIG_FOUND)
+find_package(Qt6 6.6 COMPONENTS Widgets Multimedia Network LinguistTools REQUIRED)
-pkg_check_modules(TagLib taglib IMPORTED_TARGET)
+find_package(TagLib 2.0.0)
-endif ()
+find_package(KF6Codecs 6.1.0)
+
+FetchContent_Declare(
+    kissfft
+    GIT_REPOSITORY https://github.com/mborgerding/kissfft.git
+    GIT_TAG f5f2a3b2f2cd02bf80639adb12cbeed125bdf420
+)
+set(KISSFFT_PKGCONFIG OFF CACHE BOOL "dep(kissfft): pkgconfig support")
+set(KISSFFT_STATIC ON CACHE BOOL "dep(kissfft): static linking")
+set(KISSFFT_TEST OFF CACHE BOOL "dep(kissfft): enable testing")
+set(KISSFFT_TOOLS OFF CACHE BOOL "dep(kissfft): build tools")
+FetchContent_MakeAvailable(kissfft)
+
+if (USE_QTEXTCODEC)
+    find_package(Qt6 6.6 COMPONENTS Core5Compat REQUIRED)
+endif()
 
 set (PMUSIC_CPP_FILES
     main.cpp
@@ -29,7 +43,8 @@ set (PMUSIC_CPP_FILES
     playlistmanager.cpp
     singleapplicationmanager.cpp
     lrcbar.cpp
-    lyricsmanager.cpp
+    lyricsmanager.cpp
+    fftspectrum.cpp
 )
 
 set (PMUSIC_HEADER_FILES
@@ -38,7 +53,8 @@ set (PMUSIC_HEADER_FILES
     playlistmanager.h
     singleapplicationmanager.h
     lrcbar.h
-    lyricsmanager.h
+    lyricsmanager.h
+    fftspectrum.h
 )
 
 set (PMUSIC_UI_FILES
@@ -70,16 +86,20 @@ endif ()
 if (NOT TagLib_FOUND)
     target_compile_definitions(${EXE_NAME} PRIVATE NO_TAGLIB=1)
 else ()
-    target_link_libraries(${EXE_NAME} PRIVATE PkgConfig::TagLib)
+    target_link_libraries(${EXE_NAME} PRIVATE TagLib::tag)
 endif ()
 
-if (NOT uchardet_FOUND)
+if (TARGET KF6::Codecs)
-    target_compile_definitions(${EXE_NAME} PRIVATE NO_UCHARDET=1)
+    target_compile_definitions(${EXE_NAME} PRIVATE HAVE_KCODECS=1)
-else ()
+    target_link_libraries (${EXE_NAME} PRIVATE KF6::Codecs)
-    target_link_libraries (${EXE_NAME} PRIVATE uchardet::libuchardet)
 endif ()
 
-target_link_libraries(${EXE_NAME} PRIVATE Qt::Widgets Qt::Multimedia Qt::Network)
+target_link_libraries(${EXE_NAME} PRIVATE Qt::Widgets Qt::Multimedia Qt::Network kissfft::kissfft)
+
+if (USE_QTEXTCODEC)
+    target_compile_definitions(${EXE_NAME} PRIVATE USE_QTEXTCODEC=1)
+    target_link_libraries(${EXE_NAME} PRIVATE Qt6::Core5Compat)
+endif()
 
 # Install settings
 if (WIN32)

README.md

@@ -2,12 +2,23 @@
 
 Since **I** just need a simple player which *just works* right now, so I did many things in a dirty way. Don't feel so weird if you saw something I did in this project is using a bad approach.
 
-### Feature Notice
+### Features
+
+We have the following features:
+
+- [Sidecar](https://en.wikipedia.org/wiki/Sidecar_file) lyrics file (`.lrc`) support with an optional desktop lyrics bar widget
+- Auto-load all audio files in the same folder of the file that you attempted to play, into a playlist
+
+But these features are not available, some of them are TBD and others are not planned:
 
 - File format support will be limited by the [FFmpeg version that Qt 6 uses](https://doc.qt.io/qt-6/qtmultimedia-attribution-ffmpeg.html).
   - ...which if you use Qt's official binary, only contains the LGPLv2.1+ part. (already good enough, tho)
 - No music library management support and there won't be one!
   - It'll auto-load music files in the same folder of the file that you attempted to play, so organize your music files on a folder-basis.
+- Limited system integration:
+  - No [SMTC](https://learn.microsoft.com/en-us/uwp/api/windows.media.systemmediatransportcontrols) support under Windows for now
+  - No [MPRIS](https://www.freedesktop.org/wiki/Specifications/mpris-spec/) support under Linux desktop for now
+  - No "playback progress on taskbar icon" and "taskbar thumbnail buttons" support whatever on Windows or Linux desktop for now
 - Limited lyrics (`.lrc`) loading support:
   - Currently no `.tlrc` (for translated lyrics) or `.rlrc` (for romanized lyrics) support.
   - Multi-line lyrics and duplicated timestamps are not supported
@@ -20,7 +31,7 @@ Current state, we need:
  - `cmake` as the build system.
  - `qt6` with `qt6-multimedia` since we use it for playback.
  - `taglib` to get the audio file properties.
- - `pkg-config` to find the installed taglib.
+ - `kissfft` for FFT support (will be downloaded at configure-time by `cmake`).
 
 Then we can build it with any proper c++ compiler like g++ or msvc.
 

appveyor.yml

@@ -3,7 +3,6 @@ image:
 environment:
   CMAKE_INSTALL_ROOT: C:\projects\cmake
   PACKAGE_INSTALL_ROOT: C:\projects\pir
-  PKG_CONFIG_PATH: C:\projects\pir\lib\pkgconfig
   matrix:
     - build_name: mingw1120_64_qt6_7
       QTPATH: C:\Qt\6.7\mingw_64
@@ -22,12 +21,19 @@ build_script:
 # prepare
   - mkdir 3rdparty
   - choco install ninja
-  - choco install pkgconfiglite
+  - choco install gperf
   - cd 3rdparty
-# build uchardet
+# install ECM
-  - git clone -q https://gitlab.freedesktop.org/uchardet/uchardet.git
+  - git clone -q https://invent.kde.org/frameworks/extra-cmake-modules.git
-  - cd uchardet
+  - git rev-parse HEAD
-  - cmake -G "Ninja" . -DCMAKE_INSTALL_PREFIX=%PACKAGE_INSTALL_ROOT% -DBUILD_BINARY=OFF
+  - cd extra-cmake-modules
+  - cmake -G "Ninja" . -DCMAKE_INSTALL_PREFIX=%PACKAGE_INSTALL_ROOT% -DBUILD_TESTING=OFF
+  - cmake --build . --target install
+  - cd %APPVEYOR_BUILD_FOLDER%
+# build kcodecs
+  - git clone -q https://invent.kde.org/frameworks/kcodecs.git
+  - cd kcodecs
+  - cmake -G "Ninja" . -DCMAKE_INSTALL_PREFIX=%PACKAGE_INSTALL_ROOT% -DBUILD_TESTING=OFF
   - cmake --build . --target install
   - cd %APPVEYOR_BUILD_FOLDER%
 # build taglib

fftspectrum.cpp

@@ -0,0 +1,124 @@
+// SPDX-FileCopyrightText: 2024 Gary Wang <git@blumia.net>
+//
+// SPDX-License-Identifier: MIT
+
+#include "fftspectrum.h"
+
+#include <QAudioBuffer>
+#if QT_VERSION >= QT_VERSION_CHECK(6, 8, 0)
+#include <QAudioBufferOutput>
+#endif // QT_VERSION >= QT_VERSION_CHECK(6, 8, 0)
+#include <QPainter>
+
+#include <kissfft.hh>
+
+FFTSpectrum::FFTSpectrum(QWidget* parent)
+    : QWidget(parent)
+#if QT_VERSION >= QT_VERSION_CHECK(6, 8, 0)
+    , m_audioBufferOutput(new QAudioBufferOutput(this))
+#endif // #if QT_VERSION >= QT_VERSION_CHECK(6, 8, 0)
+{
+#if QT_VERSION >= QT_VERSION_CHECK(6, 8, 0)
+    connect(this, &FFTSpectrum::mediaPlayerChanged, this, [=]() {
+        if (m_mediaPlayer) {
+            m_mediaPlayer->setAudioBufferOutput(m_audioBufferOutput);
+        }
+    });
+
+    connect(m_audioBufferOutput, &QAudioBufferOutput::audioBufferReceived, this, [=](const QAudioBuffer& buffer) {
+        const QAudioFormat& fmt = buffer.format();
+        const QAudioFormat::SampleFormat sampleFormat = fmt.sampleFormat();
+        QAudioFormat::ChannelConfig channelConfig = fmt.channelConfig();
+        const QFlags supportedChannelConfig({ QAudioFormat::ChannelConfigMono, QAudioFormat::ChannelConfigStereo });
+        const int frameCount = buffer.frameCount();
+        kissfft<float> fft(frameCount, false);
+        std::vector<kissfft<float>::cpx_t> samples(frameCount);
+        std::vector<kissfft<float>::cpx_t> mass(frameCount);
+        if (sampleFormat == QAudioFormat::Int16 && supportedChannelConfig.testFlag(channelConfig)) {
+            if (channelConfig == QAudioFormat::ChannelConfigMono) {
+                const QAudioBuffer::S16M* data = buffer.constData<QAudioBuffer::S16M>();
+                for (int i = 0; i < frameCount; ++i) {
+                    samples[i].real(data[i].value(QAudioFormat::FrontCenter) / float(32768));
+                    samples[i].imag(0);
+                }
+            } else {
+                const QAudioBuffer::S16S* data = buffer.constData<QAudioBuffer::S16S>();
+                for (int i = 0; i < frameCount; ++i) {
+                    samples[i].real(data[i].value(QAudioFormat::FrontLeft) / float(32768));
+                    samples[i].imag(0);
+                }
+            }
+        } else if (sampleFormat == QAudioFormat::Int32 && supportedChannelConfig.testFlag(channelConfig)) {
+            if (channelConfig == QAudioFormat::ChannelConfigMono) {
+                const QAudioBuffer::S32M* data = buffer.constData<QAudioBuffer::S32M>();
+                for (int i = 0; i < frameCount; ++i) {
+                    samples[i].real(data[i].value(QAudioFormat::FrontCenter) / float(2147483647));
+                    samples[i].imag(0);
+                }
+            } else {
+                const QAudioBuffer::S32S* data = buffer.constData<QAudioBuffer::S32S>();
+                for (int i = 0; i < frameCount; ++i) {
+                    samples[i].real(data[i].value(QAudioFormat::FrontLeft) / float(2147483647));
+                    samples[i].imag(0);
+                }
+            }
+        } else if (sampleFormat == QAudioFormat::Float && supportedChannelConfig.testFlag(channelConfig)) {
+            if (channelConfig == QAudioFormat::ChannelConfigMono) {
+                const QAudioBuffer::F32M* data = buffer.constData<QAudioBuffer::F32M>();
+                for (int i = 0; i < frameCount; ++i) {
+                    samples[i].real(data[i].value(QAudioFormat::FrontCenter));
+                    samples[i].imag(0);
+                }
+            } else {
+                const QAudioBuffer::F32S* data = buffer.constData<QAudioBuffer::F32S>();
+                for (int i = 0; i < frameCount; ++i) {
+                    samples[i].real(data[i].value(QAudioFormat::FrontLeft));
+                    samples[i].imag(0);
+                }
+            }
+        } else {
+            qWarning() << "Unsupported format or channel config:" << sampleFormat << channelConfig;
+            return;
+        }
+        fft.transform(samples.data(), mass.data());
+        m_freq.resize(frameCount);
+        for (int i = 0; i < frameCount; i++) {
+            m_freq[i] = sqrt(mass[i].real() * mass[i].real() + mass[i].imag() * mass[i].imag());
+        }
+        for (auto& val : m_freq) {
+            val = log10(val + 1);
+        }
+        qDebug() << m_freq.size() << "updated" << sampleFormat << channelConfig;
+        update();
+    });
+#endif // QT_VERSION >= QT_VERSION_CHECK(6, 8, 0)
+    resize(490, 420);
+}
+
+FFTSpectrum::~FFTSpectrum()
+{
+
+}
+
+void FFTSpectrum::setMediaPlayer(QMediaPlayer* player)
+{
+    m_mediaPlayer = player;
+    emit mediaPlayerChanged();
+}
+
+void FFTSpectrum::paintEvent(QPaintEvent* e)
+{
+    QPainter painter(this);
+
+    if (!m_freq.empty()) {
+        int width = this->width();
+        int height = this->height();
+        int barWidth = std::max(1ULL, width / m_freq.size());
+        for (int i = 0; i < m_freq.size(); i++) {
+            int barHeight = static_cast<int>(sqrt(m_freq[i]) * height * 0.5);
+            painter.fillRect(i * barWidth, height - barHeight, barWidth, barHeight, QColor(70, 130, 180, (int)(140 * m_freq[i]) + 90));
+        }
+    }
+}
+
+

fftspectrum.h

@@ -0,0 +1,31 @@
+// SPDX-FileCopyrightText: 2024 Gary Wang <git@blumia.net>
+//
+// SPDX-License-Identifier: MIT
+
+#pragma once
+
+#include <QWidget>
+#include <QMediaPlayer>
+
+class QAudioBufferOutput;
+class FFTSpectrum : public QWidget
+{
+    Q_OBJECT
+    Q_PROPERTY(QMediaPlayer * mediaPlayer MEMBER m_mediaPlayer WRITE setMediaPlayer NOTIFY mediaPlayerChanged)
+public:
+    explicit FFTSpectrum(QWidget* parent);
+    ~FFTSpectrum();
+
+    void setMediaPlayer(QMediaPlayer* player);
+
+signals:
+    void mediaPlayerChanged();
+
+protected:
+    void paintEvent(QPaintEvent* e) override;
+
+private:
+    QMediaPlayer* m_mediaPlayer = nullptr;
+    QAudioBufferOutput* m_audioBufferOutput = nullptr;
+    std::vector<float> m_freq;
+};

lyricsmanager.cpp

@@ -9,8 +9,14 @@
 #include <QRegularExpression>
 #include <QStringConverter>
 
-#ifndef NO_UCHARDET
+#ifdef HAVE_KCODECS
-#include <uchardet/uchardet.h>
+#include <KCharsets>
+#include <KCodecs>
+#include <KEncodingProber>
+#endif
+
+#ifdef USE_QTEXTCODEC
+#include <QTextCodec>
 #endif
 
 Q_LOGGING_CATEGORY(lcLyrics, "pmusic.lyrics")
@@ -44,24 +50,38 @@ bool LyricsManager::loadLyrics(QString filepath)
         return false;
     }
     QByteArray fileContent(file.readAll());
-#ifndef NO_UCHARDET
-    uchardet_t handle = uchardet_new();
-    uchardet_handle_data(handle, fileContent.data(), fileContent.length());
-    uchardet_data_end(handle);
-    const char* encoding = uchardet_get_charset(handle);
-    qCDebug(lcLyrics) << "Detected encoding:" << (encoding == NULL ? "unknown" : encoding);
     QStringList lines;
-    if (QStringConverter::availableCodecs().contains(QString(encoding))) {
+#ifdef HAVE_KCODECS
-        auto toUtf16 = QStringDecoder(encoding);
+    KEncodingProber prober(KEncodingProber::Universal);
+    prober.feed(fileContent);
+    QByteArray encoding(prober.encoding());
+    qCDebug(lcLyrics) << "Detected encoding:" << QString(encoding) << "with confidence" << prober.confidence();
+#ifdef USE_QTEXTCODEC
+    qCDebug(lcLyrics) << "QTextCodec is used instead of QStringConverter.";
+    QTextCodec *codec = QTextCodec::codecForName(encoding);
+    if (codec) {
+        lines = codec->toUnicode(fileContent).split('\n');
+    } else {
+        lines = QString(fileContent).split('\n');
+        qCDebug(lcLyrics) << "No codec for the detected encoding. Available codecs are:" << QTextCodec::availableCodecs();
+        qCDebug(lcLyrics) << "KCodecs offers these encodings:" << KCharsets::charsets()->availableEncodingNames();
+    }
+#else // NOT USE_QTEXTCODEC
+    auto toUtf16 = QStringDecoder(encoding);
+    // Don't use `QStringConverter::availableCodecs().contains(QString(encoding))` here, since the charset
+    // encoding name might not match, e.g. GB18030 (from availableCodecs) != gb18030 (from KEncodingProber)
+    if (toUtf16.isValid()) {
         QString decodedResult = toUtf16(fileContent);
         lines = decodedResult.split('\n');
     } else {
+        qCDebug(lcLyrics) << "No codec for the detected encoding. Available codecs are:" << QStringConverter::availableCodecs();
+        qCDebug(lcLyrics) << "KCodecs offers these encodings:" << KCharsets::charsets()->availableEncodingNames();
         lines = QString(fileContent).split('\n');
     }
-    uchardet_delete(handle);
+#endif // USE_QTEXTCODEC
-#else
+#else // NOT HAVE_KCODECS
-    QStringList lines = QString(fileContent).split('\n');
+    lines = QString(fileContent).split('\n');
-#endif
+#endif // HAVE_KCODECS
     file.close();
 
     // parse lyrics timestamp

mainwindow.cpp

@@ -6,6 +6,7 @@
 #include "./ui_mainwindow.h"
 
 #include "playlistmanager.h"
+#include "fftspectrum.h"
 #include "lrcbar.h"
 
 // taglib
@@ -41,13 +42,15 @@ MainWindow::MainWindow(QWidget *parent)
     , m_mediaDevices(new QMediaDevices(this))
     , m_mediaPlayer(new QMediaPlayer(this))
     , m_audioOutput(new QAudioOutput(this))
+    , m_fftSpectrum(new FFTSpectrum(this))
     , m_lrcbar(new LrcBar(nullptr))
     , m_playlistManager(new PlaylistManager(this))
 {
     ui->setupUi(this);
     m_playlistManager->setAutoLoadFilterSuffixes({
-        "*.mp3", "*.wav", "*.aiff", "*.ape", "*.flac", "*.ogg", "*.oga", "*.mpga", "*.aac"
+        "*.mp3", "*.wav", "*.aiff", "*.ape", "*.flac", "*.ogg", "*.oga", "*.mpga", "*.aac", "*.tta"
     });
+    m_fftSpectrum->setMediaPlayer(m_mediaPlayer);
     m_mediaPlayer->setAudioOutput(m_audioOutput);
     m_mediaPlayer->setLoops(QMediaPlayer::Infinite);
     ui->playlistView->setModel(m_playlistManager->model());
@@ -438,6 +441,8 @@ void MainWindow::initConnections()
         setAudioMetadataForDisplay(metadata.stringValue(QMediaMetaData::Title),
                                    metadata.stringValue(QMediaMetaData::Author),
                                    metadata.stringValue(QMediaMetaData::AlbumTitle));
+        setAudioPropertyInfoForDisplay(-1, metadata.value(QMediaMetaData::AudioBitRate).toInt() / 1000,
+                                       -1, metadata.stringValue(QMediaMetaData::FileFormat));
 #endif // NO_TAGLIB
         QVariant coverArt(metadata.value(QMediaMetaData::ThumbnailImage));
         if (!coverArt.isNull()) {
@@ -616,12 +621,16 @@ void MainWindow::on_actionHelp_triggered()
         "\n\n" %
         tr("Based on the following free software libraries:") %
         "\n\n" %
-        QStringLiteral("- [Qt](https://www.qt.io/) %1\n").arg(QT_VERSION_STR) %
+        QStringLiteral("- [Qt](https://www.qt.io/) %1 with the following module(s):\n").arg(QT_VERSION_STR) %
+        QStringLiteral("  - multimedia\n") %
+#ifdef USE_QTEXTCODEC
+        QStringLiteral("  - core5compat\n") %
+#endif
 #ifndef NO_TAGLIB
         QStringLiteral("- [TagLib](https://github.com/taglib/taglib)\n") %
 #endif // NO_TAGLIB
-#ifndef NO_UCHARDET
+#ifdef HAVE_KCODECS
-        QStringLiteral("- [uchardet](https://www.freedesktop.org/wiki/Software/uchardet/)\n") %
+        QStringLiteral("- [KCodecs](https://invent.kde.org/frameworks/kcodecs)\n") %
 #endif // NO_TAGLIB
         "\n"
         "[Source Code](https://github.com/BLumia/pineapple-music)\n"

mainwindow.h

@@ -17,6 +17,7 @@ class QAudioOutput;
 class QPropertyAnimation;
 QT_END_NAMESPACE
 
+class FFTSpectrum;
 class LrcBar;
 class PlaylistManager;
 class MainWindow : public QMainWindow
@@ -92,6 +93,7 @@ private:
     QMediaDevices *m_mediaDevices;
     QMediaPlayer *m_mediaPlayer;
     QAudioOutput *m_audioOutput;
+    FFTSpectrum* m_fftSpectrum;
     LrcBar *m_lrcbar;
     QPropertyAnimation *m_fadeOutAnimation;
     PlaylistManager *m_playlistManager;