feat: get audio file properties from taglib

CMakeLists.txt

@@ -14,6 +14,9 @@ set(CMAKE_CXX_STANDARD 11)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 find_package(Qt5 COMPONENTS Widgets Multimedia Network REQUIRED)
+find_package(PkgConfig)
+
+pkg_check_modules(TagLib REQUIRED taglib)
 
 set (EXE_NAME pmusic)
 
@@ -35,7 +38,8 @@ add_executable(${EXE_NAME}
   ID3v2Pic.h
 )
 
-target_link_libraries(${EXE_NAME} PRIVATE Qt5::Widgets Qt5::Multimedia Qt5::Network)
+target_include_directories(${EXE_NAME} PRIVATE ${TagLib_INCLUDE_DIRS})
+target_link_libraries(${EXE_NAME} PRIVATE Qt5::Widgets Qt5::Multimedia Qt5::Network ${TagLib_LINK_LIBRARIES})
 
 # Extra build settings
 if (WIN32)

README.md

@@ -1,5 +1,6 @@
 _**This is a not ready to use, toy project**_
 
+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.
 
 ## Note
 
@@ -13,6 +14,29 @@ Windows|[Supported Formats In DirectsShow](https://msdn.microsoft.com/en-us/libr
 macOS|[Media formats supported by QuickTime Player](https://support.apple.com/en-us/HT201290)|Sorry, I don't know...
 Unix/Linux|depends on [GStreamer](https://gstreamer.freedesktop.org/) plugins which user installed|[GStreamer Plug-ins: gst-plugins-base, gst-plugins-good, gst-plugins-ugly, gst-plugins-bad](https://gstreamer.freedesktop.org/documentation/additional/splitup.html?gi-language=c)
 
+## Build
+
+Current state, we need:
+
+ - `cmake` as the build system.
+ - `qt5` with `qt5-multimedia` since we use it for playback.
+ - `taglib` to get the audio file properties.
+ - `pkg-config` to find the installed taglib.
+
+Then we can build it with any proper c++ compiler like g++ or msvc.
+
+### Linux
+
+Just normal build process as other program. Nothing special ;)
+
+### Windows
+
+Install the depts manually is a nightmare. I use [KDE Craft](https://community.kde.org/Craft) but MSYS2 should also works. FYI currently this project is not intended to works under Windows (it should works and I also did some simple test though).
+
+### macOS
+
+I don't have a mac, so no support at all.
+
 ## About License
 
 Since this is a toy repo, I don't spend much time about the license stuff. Currently this project use some assets and code from [ShadowPlayer](https://github.com/ShadowPower/ShadowPlayer), which have a very interesting license -- do whatever you want but cannot be used as homework -- obviously it's not a so called *free* license. I *may* do some license housecleaning works by replaceing the assets and code implementation when the code become reasonable, and the final codebase may probably released under MIT license.

mainwindow.cpp

@@ -6,6 +6,9 @@
 #include "ID3v2Pic.h"
 #include "FlacPic.h"
 
+// taglib
+#include <fileref.h>
+
 #include <QPainter>
 #include <QMediaPlayer>
 #include <QMediaPlaylist>
@@ -81,6 +84,43 @@ void MainWindow::loadPlaylistBySingleLocalFile(const QString &path)
     playlist->setCurrentIndex(currentFileIndex);
 }
 
+void MainWindow::setAudioPropertyInfoForDisplay(int sampleRate, int bitrate, int channelCount, QString audioExt)
+{
+    QStringList uiStrs;
+    QStringList tooltipStrs;
+
+    auto channelStr = [](int channelCnt) {
+        switch (channelCnt) {
+        case 1:
+            return tr("Mono");
+        case 2:
+            return tr("Stereo");
+        default:
+            return tr("%1 Channels").arg(channelCnt);
+        }
+    };
+
+    if (sampleRate >= 0) {
+        uiStrs << QString("%1 Hz").arg(sampleRate);
+        tooltipStrs << QString("Sample Rate: %1 Hz").arg(sampleRate);
+    }
+
+    if (bitrate >= 0) {
+        uiStrs << QString("%1 Kbps").arg(bitrate);
+        tooltipStrs << QString("Bitrate: %1 Kbps").arg(bitrate);
+    }
+
+    if (channelCount >= 0) {
+        uiStrs << channelStr(channelCount);
+        tooltipStrs << QString("Channel Count: %1").arg(channelCount);
+    }
+
+    uiStrs << audioExt;
+
+    ui->propLabel->setText(uiStrs.join(" | "));
+    ui->propLabel->setToolTip(tooltipStrs.join('\n'));
+}
+
 void MainWindow::localSocketPlayAudioFiles(QVariant audioFilesVariant)
 {
     QStringList urlStrList = audioFilesVariant.toStringList();
@@ -248,6 +288,8 @@ void MainWindow::on_playBtn_clicked()
     if (m_mediaPlayer->mediaStatus() == QMediaPlayer::NoMedia) {
         loadFile();
         m_mediaPlayer->play();
+    } else if (m_mediaPlayer->mediaStatus() == QMediaPlayer::InvalidMedia) {
+        ui->propLabel->setText("Error: InvalidMedia");
     } else {
         if (QList<QMediaPlayer::State> {QMediaPlayer::PausedState, QMediaPlayer::StoppedState}
                 .contains(m_mediaPlayer->state())) {
@@ -364,22 +406,32 @@ void MainWindow::initConnections()
         QUrl fileUrl = media.canonicalUrl();
 #else
         QUrl fileUrl = media.request().url();
-#endif // QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
+#endif // QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
 
         ui->titleLabel->setText(fileUrl.fileName());
+        ui->titleLabel->setToolTip(fileUrl.fileName());
+
         if (fileUrl.isLocalFile()) {
+            QString filePath(fileUrl.toLocalFile());
+            QString suffix(filePath.mid(filePath.lastIndexOf('.') + 1));
+            suffix = suffix.toUpper();
+
+            TagLib::FileRef fileRef(filePath.toLocal8Bit().data());
+            if(!fileRef.isNull() && fileRef.audioProperties()) {
+                TagLib::AudioProperties *prop = fileRef.audioProperties();
+                setAudioPropertyInfoForDisplay(prop->sampleRate(), prop->bitrate(), prop->channels(), suffix);
+            }
+
             using namespace spID3;
             using namespace spFLAC;
 
-            QString filePath(fileUrl.toLocalFile());
-
-            if (filePath.endsWith(".mp3")) {
+            if (suffix == "MP3") {
                 if (spID3::loadPictureData(filePath.toLocal8Bit().data())) {
                     QByteArray picData((const char*)spID3::getPictureDataPtr(), spID3::getPictureLength());
                     ui->coverLabel->setPixmap(QPixmap::fromImage(QImage::fromData(picData)));
                     spID3::freePictureData();
                 }
-            } else if (filePath.endsWith(".flac")) {
+            } else if (suffix == "FLAC") {
                 if (spFLAC::loadPictureData(filePath.toLocal8Bit().data())) {
                     QByteArray picData((const char*)spFLAC::getPictureDataPtr(), spFLAC::getPictureLength());
                     ui->coverLabel->setPixmap(QPixmap::fromImage(QImage::fromData(picData)));

mainwindow.h

@@ -23,6 +23,7 @@ public:
 
     void commandlinePlayAudioFiles(QStringList audioFiles);
     void loadPlaylistBySingleLocalFile(const QString &path);
+    void setAudioPropertyInfoForDisplay(int sampleRate, int bitrate, int channelCount, QString audioExt);
 
 public slots:
     void localSocketPlayAudioFiles(QVariant audioFilesVariant);

mainwindow.ui

@@ -301,7 +301,7 @@ QLabel#coverLabel {
            <item>
             <widget class="QLabel" name="propLabel">
              <property name="text">
-              <string>44100 Hz | 233 Kbps | Stereo | MP3</string>
+              <string>Drag and drop file to load</string>
              </property>
             </widget>
            </item>