qt: medialib: convert description into Q_GADGET

VideoDescription and AudioDescription were QObject.

To pave the way to remove the QObject inheritance from MLVideo, convert
them to Q_GADGET and return them by value.

Signed-off-by: Pierre Lamot <pierre@videolabs.io>

modules/gui/qt/medialibrary/mlvideo.cpp

@@ -22,9 +22,8 @@
 
 #include <vlc_thumbnailer.h>
 
-VideoDescription::VideoDescription(const QString &codec, const QString &language, const unsigned int fps, QObject *parent)
-    : QObject(parent)
-    , m_codec(codec)
+VideoDescription::VideoDescription(const QString &codec, const QString &language, const unsigned int fps)
+    : m_codec(codec)
     , m_language(language)
     , m_fps(fps)
 {
@@ -45,9 +44,8 @@ unsigned int VideoDescription::getFps() const
     return m_fps;
 }
 
-AudioDescription::AudioDescription(const QString &codec, const QString &language, const unsigned int nbChannels, const unsigned int sampleRate, QObject *parent)
-    : QObject(parent)
-    , m_codec(codec)
+AudioDescription::AudioDescription(const QString &codec, const QString &language, const unsigned int nbChannels, const unsigned int sampleRate)
+    : m_codec(codec)
     , m_language(language)
     , m_nbchannels(nbChannels)
     , m_sampleRate(sampleRate)
@@ -105,22 +103,20 @@ MLVideo::MLVideo(vlc_medialibrary_t* ml, const vlc_ml_media_t* data, QObject* pa
         if ( track.i_type == VLC_ML_TRACK_TYPE_AUDIO ) {
             numChannel = std::max( numChannel , track.a.i_nbChannels );
 
-            m_audioDesc.push_back( new AudioDescription ( QString::fromUtf8( track.psz_codec ) ,
-                                                         QString::fromUtf8( track.psz_language  ) ,
-                                                         track.a.i_nbChannels ,
-                                                         track.a.i_sampleRate ,
-                                                         this )
-                                   );
+            m_audioDesc.push_back( { QString::fromUtf8( track.psz_codec ) ,
+                                     QString::fromUtf8( track.psz_language  ) ,
+                                     track.a.i_nbChannels ,
+                                     track.a.i_sampleRate }
+                                 );
         }
         else if ( track.i_type == VLC_ML_TRACK_TYPE_VIDEO ){
             maxWidth = std::max( maxWidth, track.v.i_width );
             maxHeight = std::max( maxHeight, track.v.i_height );
 
-            m_videoDesc.push_back(  new VideoDescription( QString::fromUtf8( track.psz_codec ) ,
-                                                        QString::fromUtf8( track.psz_language ) ,
-                                                        track.v.i_fpsNum,
-                                                        this )
-                                  );
+            m_videoDesc.push_back( { QString::fromUtf8( track.psz_codec ) ,
+                                     QString::fromUtf8( track.psz_language ) ,
+                                     track.v.i_fpsNum }
+                                 );
         }
     }
 
@@ -228,12 +224,12 @@ QString MLVideo::getProgressTime() const
     return MsToString(m_duration * m_progress);
 }
 
-QObjectList MLVideo::getVideoDesc() const
+QList<VideoDescription> MLVideo::getVideoDesc() const
 {
     return m_videoDesc;
 }
 
-QObjectList MLVideo::getAudioDesc() const
+QList<AudioDescription> MLVideo::getAudioDesc() const
 {
     return m_audioDesc;
 }

modules/gui/qt/medialibrary/mlvideo.hpp

@@ -32,16 +32,17 @@
 
 #include <functional>
 
-class VideoDescription : public QObject
+class VideoDescription
 {
-    Q_OBJECT
+    Q_GADGET
 
     Q_PROPERTY(QString codec READ getCodec CONSTANT)
     Q_PROPERTY(QString language READ getLanguage CONSTANT)
     Q_PROPERTY(unsigned int fps READ getFps CONSTANT)
 
 public:
-    VideoDescription(const QString& codec, const QString& language, unsigned int fps, QObject *parent = nullptr);
+    VideoDescription() = default;
+    VideoDescription(const QString& codec, const QString& language, unsigned int fps);
 
     QString getCodec() const;
     QString getLanguage() const;
@@ -54,9 +55,11 @@ private:
     unsigned int m_fps;
 };
 
-class AudioDescription : public QObject
+Q_DECLARE_METATYPE(VideoDescription)
+
+class AudioDescription
 {
-    Q_OBJECT
+    Q_GADGET
 
     Q_PROPERTY(QString codec READ getCodec CONSTANT)
     Q_PROPERTY(QString language READ getLanguage CONSTANT)
@@ -64,7 +67,8 @@ class AudioDescription : public QObject
     Q_PROPERTY(unsigned int sampleRate READ getSampleRate CONSTANT)
 
 public:
-    AudioDescription(const QString& codec, const QString& language, unsigned int nbChannels, unsigned int sampleRate, QObject *parent = nullptr);
+    AudioDescription() = default;
+    AudioDescription(const QString& codec, const QString& language, unsigned int nbChannels, unsigned int sampleRate);
 
     QString getCodec() const;
     QString getLanguage() const;
@@ -79,6 +83,8 @@ private:
     unsigned int m_sampleRate;
 };
 
+Q_DECLARE_METATYPE(AudioDescription)
+
 class MLVideo : public QObject, public MLItem
 {
     Q_OBJECT
@@ -97,8 +103,8 @@ public:
     float getProgress() const;
     unsigned int getPlayCount() const;
     QString getProgressTime() const;
-    QObjectList getAudioDesc() const;
-    QObjectList getVideoDesc() const;
+    QList<AudioDescription> getAudioDesc() const;
+    QList<VideoDescription> getVideoDesc() const;
 
 private:
     static void onMlEvent( void* data, const vlc_ml_event_t* event );
@@ -115,8 +121,8 @@ private:
     QString m_progressTime;
     unsigned int m_playCount;
     vlc_ml_thumbnail_status_t m_thumbnailStatus;
-    QObjectList m_audioDesc;
-    QObjectList m_videoDesc;
+    QList<AudioDescription> m_audioDesc;
+    QList<VideoDescription> m_videoDesc;
 
     std::unique_ptr<vlc_ml_event_callback_t,
                     std::function<void(vlc_ml_event_callback_t*)>> m_ml_event_handle;