fixed build with -Werror=zero-as-null-pointer-constant

git-svn-id: http://svn.code.sf.net/p/qmmp-dev/code/trunk/qmmp@8572 90c681e8-e032-0410-971d-27865f9a5e38

351 files changed, 883 insertions, 883 deletions

diff --git a/src/app/builtincommandlineoption.cpp b/src/app/builtincommandlineoption.cpp
index 919ab6df4..e52abfa84 100644
--- a/src/app/builtincommandlineoption.cpp
+++ b/src/app/builtincommandlineoption.cpp
@@ -33,7 +33,7 @@
 
 BuiltinCommandLineOption::BuiltinCommandLineOption(QObject *parent) : QObject(parent)
 {
-    m_model = 0;
+    m_model = nullptr;
     m_options << "--enqueue" << "-e"
               << "--play" << "-p"
               << "--pause" << "-u"
@@ -253,7 +253,7 @@ void BuiltinCommandLineOption::disconnectPl()
         disconnect(m_model, SIGNAL(trackAdded(PlayListTrack*)), MediaPlayer::instance(), SLOT(play()));
         disconnect(m_model, SIGNAL(trackAdded(PlayListTrack*)), this, SLOT(disconnectPl()));
         disconnect(m_model, SIGNAL(loaderFinished()), this, SLOT(disconnectPl()));
-        m_model = 0;
+        m_model = nullptr;
     }
 }
 
diff --git a/src/app/builtincommandlineoption.h b/src/app/builtincommandlineoption.h
index 9121ebf76..370c57890 100644
--- a/src/app/builtincommandlineoption.h
+++ b/src/app/builtincommandlineoption.h
@@ -38,7 +38,7 @@ class BuiltinCommandLineOption : public QObject
 {
     Q_OBJECT
 public:
-    BuiltinCommandLineOption(QObject *parent = 0);
+    BuiltinCommandLineOption(QObject *parent = nullptr);
 
     ~BuiltinCommandLineOption();
 
diff --git a/src/app/qmmpstarter.cpp b/src/app/qmmpstarter.cpp
index bb47791af..291a6db7a 100644
--- a/src/app/qmmpstarter.cpp
+++ b/src/app/qmmpstarter.cpp
@@ -57,9 +57,9 @@ using namespace std;
 
 QMMPStarter::QMMPStarter() : QObject()
 {
-    m_player = 0;
-    m_core = 0;
-    m_ui = 0;
+    m_player = nullptr;
+    m_core = nullptr;
+    m_ui = nullptr;
     m_finished = false;
     m_exit_code = EXIT_SUCCESS;
 #ifndef QT_NO_SESSIONMANAGER
diff --git a/src/plugins/CommandLineOptions/PlayListOption/playlistoption.cpp b/src/plugins/CommandLineOptions/PlayListOption/playlistoption.cpp
index fd30a012f..4ea09b94d 100644
--- a/src/plugins/CommandLineOptions/PlayListOption/playlistoption.cpp
+++ b/src/plugins/CommandLineOptions/PlayListOption/playlistoption.cpp
@@ -64,7 +64,7 @@ QString PlayListOption::executeCommand(int id, const QStringList &args)
     QString out;
     PlayListManager *pl_manager = PlayListManager::instance();
     MediaPlayer *player = MediaPlayer::instance();
-    QmmpUiSettings *ui_settings = (id == PL_HELP) ? 0 : QmmpUiSettings::instance();
+    QmmpUiSettings *ui_settings = (id == PL_HELP) ? nullptr : QmmpUiSettings::instance();
 
     switch (id)
     {
diff --git a/src/plugins/Effect/bs2b/bs2bplugin.cpp b/src/plugins/Effect/bs2b/bs2bplugin.cpp
index 52df6aa63..5460e4c9a 100644
--- a/src/plugins/Effect/bs2b/bs2bplugin.cpp
+++ b/src/plugins/Effect/bs2b/bs2bplugin.cpp
@@ -24,7 +24,7 @@
 #include <qmmp/qmmp.h>
 #include "bs2bplugin.h"
 
-Bs2bPlugin *Bs2bPlugin::m_instance = 0;
+Bs2bPlugin *Bs2bPlugin::m_instance = nullptr;
 
 Bs2bPlugin::Bs2bPlugin() : Effect()
 {
@@ -37,7 +37,7 @@ Bs2bPlugin::Bs2bPlugin() : Effect()
 
 Bs2bPlugin::~Bs2bPlugin()
 {
-    m_instance = 0;
+    m_instance = nullptr;
     bs2b_close(m_bs2b_handler);
 }
 
diff --git a/src/plugins/Effect/bs2b/settingsdialog.h b/src/plugins/Effect/bs2b/settingsdialog.h
index 9813712e9..7b1128df5 100644
--- a/src/plugins/Effect/bs2b/settingsdialog.h
+++ b/src/plugins/Effect/bs2b/settingsdialog.h
@@ -31,7 +31,7 @@ class SettingsDialog : public QDialog
 {
 Q_OBJECT
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
 
     ~SettingsDialog();
 
diff --git a/src/plugins/Effect/crossfade/crossfadeplugin.cpp b/src/plugins/Effect/crossfade/crossfadeplugin.cpp
index 3d9850361..29e76bd86 100644
--- a/src/plugins/Effect/crossfade/crossfadeplugin.cpp
+++ b/src/plugins/Effect/crossfade/crossfadeplugin.cpp
@@ -26,7 +26,7 @@
 
 CrossfadePlugin::CrossfadePlugin() : Effect()
 {
-    m_buffer = 0;
+    m_buffer = nullptr;
     m_buffer_at = 0;
     m_buffer_size = 0;
     m_core = SoundCore::instance() ;
diff --git a/src/plugins/Effect/crossfade/settingsdialog.h b/src/plugins/Effect/crossfade/settingsdialog.h
index 625fe4085..40a8a4a87 100644
--- a/src/plugins/Effect/crossfade/settingsdialog.h
+++ b/src/plugins/Effect/crossfade/settingsdialog.h
@@ -30,7 +30,7 @@ class SettingsDialog : public QDialog
 {
 Q_OBJECT
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
 
     ~SettingsDialog();
 
diff --git a/src/plugins/Effect/filewriter/filewriterplugin.cpp b/src/plugins/Effect/filewriter/filewriterplugin.cpp
index e60047ac1..f45a8b4e3 100644
--- a/src/plugins/Effect/filewriter/filewriterplugin.cpp
+++ b/src/plugins/Effect/filewriter/filewriterplugin.cpp
@@ -27,7 +27,7 @@
 
 FileWriterPlugin::FileWriterPlugin()
 {
-    qsrand(time(NULL));
+    qsrand(time(nullptr));
     m_inited = false;
 }
 
@@ -67,7 +67,7 @@ void FileWriterPlugin::applyEffect(Buffer *b)
     while(ok && vorbis_analysis_blockout(&m_vd, &m_vb) == 1)
     {
         // analysis, assume we want to use bitrate management
-        vorbis_analysis(&m_vb, NULL);
+        vorbis_analysis(&m_vb, nullptr);
         vorbis_bitrate_addblock(&m_vb);
 
         while(ok && vorbis_bitrate_flushpacket(&m_vd, &m_op))
@@ -167,7 +167,7 @@ void FileWriterPlugin::init(const TrackInfo &info)
         { Qmmp::YEAR, "date"},
         { Qmmp::COMPOSER, "composer"},
         { Qmmp::DISCNUMBER, "discnumber"},
-        { Qmmp::UNKNOWN, 0}
+        { Qmmp::UNKNOWN, nullptr}
     };
 
     int i = 0;
diff --git a/src/plugins/Effect/filewriter/settingsdialog.h b/src/plugins/Effect/filewriter/settingsdialog.h
index e3a64c9c3..8902ba2bf 100644
--- a/src/plugins/Effect/filewriter/settingsdialog.h
+++ b/src/plugins/Effect/filewriter/settingsdialog.h
@@ -30,7 +30,7 @@ class SettingsDialog : public QDialog
 {
 Q_OBJECT
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
 
     ~SettingsDialog();
 
diff --git a/src/plugins/Effect/ladspa/ladspabutton.h b/src/plugins/Effect/ladspa/ladspabutton.h
index e4a96d6dc..e29813b20 100644
--- a/src/plugins/Effect/ladspa/ladspabutton.h
+++ b/src/plugins/Effect/ladspa/ladspabutton.h
@@ -33,7 +33,7 @@ class LADSPAButton : public QCheckBox
 {
 Q_OBJECT
 public:
-    LADSPAButton(LADSPA_Data *value, QWidget *parent = 0);
+    LADSPAButton(LADSPA_Data *value, QWidget *parent = nullptr);
 
 private slots:
     void enable(bool yes);
diff --git a/src/plugins/Effect/ladspa/ladspahost.cpp b/src/plugins/Effect/ladspa/ladspahost.cpp
index 171346a12..b962f3d81 100644
--- a/src/plugins/Effect/ladspa/ladspahost.cpp
+++ b/src/plugins/Effect/ladspa/ladspahost.cpp
@@ -35,7 +35,7 @@
 #define PATH_MAX 4096
 #endif
 
-LADSPAHost *LADSPAHost::m_instance = 0;
+LADSPAHost *LADSPAHost::m_instance = nullptr;
 
 /* Based on xmms_ladspa */
 
@@ -55,7 +55,7 @@ LADSPAHost::LADSPAHost(QObject *parent) : QObject(parent)
 
         int id = settings.value("id").toInt();
 
-        LADSPAPlugin *plugin = 0;
+        LADSPAPlugin *plugin = nullptr;
         foreach(LADSPAPlugin *p, plugins())
         {
             if(p->unique_id == id)
@@ -78,7 +78,7 @@ LADSPAHost::LADSPAHost(QObject *parent) : QObject(parent)
 
 LADSPAHost::~LADSPAHost()
 {
-    m_instance = 0;
+    m_instance = nullptr;
     QSettings settings(Qmmp::configFile(), QSettings::IniFormat);
     for(int i = 0; i < settings.value("LADSPA/plugins_number", 0).toInt(); ++i)
     {
@@ -178,7 +178,7 @@ void LADSPAHost::findModules(const QString &path)
         unsigned long k = 0;
         const LADSPA_Descriptor *descriptor;
 
-        while((descriptor = descriptor_fn(k)) != 0)
+        while((descriptor = descriptor_fn(k)) != nullptr)
         {
             if(LADSPA_IS_INPLACE_BROKEN(descriptor->Properties))
             {
diff --git a/src/plugins/Effect/ladspa/ladspaslider.h b/src/plugins/Effect/ladspa/ladspaslider.h
index 0c7775349..e40e8f686 100644
--- a/src/plugins/Effect/ladspa/ladspaslider.h
+++ b/src/plugins/Effect/ladspa/ladspaslider.h
@@ -37,7 +37,7 @@ public:
                  double max,
                  double step,
                  LADSPA_Data *value,
-                 QWidget *parent = 0);
+                 QWidget *parent = nullptr);
 
 private slots:
     void setValue(double);
diff --git a/src/plugins/Effect/ladspa/settingsdialog.cpp b/src/plugins/Effect/ladspa/settingsdialog.cpp
index 52f97a1da..ab52723a3 100644
--- a/src/plugins/Effect/ladspa/settingsdialog.cpp
+++ b/src/plugins/Effect/ladspa/settingsdialog.cpp
@@ -102,9 +102,9 @@ void SettingsDialog::on_configureButton_clicked()
     QDialog *dialog = new QDialog(this);
     dialog->setWindowTitle(effect->plugin->desc->Name);
     QFormLayout *formLayout = new QFormLayout(dialog);
-    LADSPAButton *button = 0;
-    LADSPASlider *slider = 0;
-    QLabel *label = 0;
+    LADSPAButton *button = nullptr;
+    LADSPASlider *slider = nullptr;
+    QLabel *label = nullptr;
 
     foreach(LADSPAControl *c, effect->controls)
     {
diff --git a/src/plugins/Effect/ladspa/settingsdialog.h b/src/plugins/Effect/ladspa/settingsdialog.h
index fffe0e81b..3fb9eb94a 100644
--- a/src/plugins/Effect/ladspa/settingsdialog.h
+++ b/src/plugins/Effect/ladspa/settingsdialog.h
@@ -35,7 +35,7 @@ class SettingsDialog : public QDialog
 {
 Q_OBJECT
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
 
     ~SettingsDialog();
 
diff --git a/src/plugins/Effect/monotostereo/monotostereoplugin.cpp b/src/plugins/Effect/monotostereo/monotostereoplugin.cpp
index b043d3f65..7a852bd0e 100644
--- a/src/plugins/Effect/monotostereo/monotostereoplugin.cpp
+++ b/src/plugins/Effect/monotostereo/monotostereoplugin.cpp
@@ -24,7 +24,7 @@
 
 MonoToStereoPlugin::MonoToStereoPlugin() : Effect()
 {
-    m_tmp = 0;
+    m_tmp = nullptr;
     m_size = 0;
     m_enabled = false;
 }
@@ -34,7 +34,7 @@ MonoToStereoPlugin::~MonoToStereoPlugin()
     if(m_tmp)
     {
         delete[] m_tmp;
-        m_tmp = 0;
+        m_tmp = nullptr;
     }
 }
 
diff --git a/src/plugins/Effect/soxr/settingsdialog.h b/src/plugins/Effect/soxr/settingsdialog.h
index 278c74504..ce0979b36 100644
--- a/src/plugins/Effect/soxr/settingsdialog.h
+++ b/src/plugins/Effect/soxr/settingsdialog.h
@@ -30,7 +30,7 @@ class SettingsDialog : public QDialog
 {
 Q_OBJECT
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
 
     ~SettingsDialog();
 
diff --git a/src/plugins/Effect/soxr/soxresampler.cpp b/src/plugins/Effect/soxr/soxresampler.cpp
index aecbb3a0e..5a7f566fc 100644
--- a/src/plugins/Effect/soxr/soxresampler.cpp
+++ b/src/plugins/Effect/soxr/soxresampler.cpp
@@ -26,8 +26,8 @@
 
 SoXResampler::SoXResampler() : Effect()
 {
-    m_soxr = 0;
-    m_out = 0;
+    m_soxr = nullptr;
+    m_out = nullptr;
     m_out_samples = 0;
     QSettings settings(Qmmp::configFile(), QSettings::IniFormat);
     m_overSamplingFs = settings.value("SOXR/sample_rate", 48000).toInt();
@@ -44,7 +44,7 @@ void SoXResampler::applyEffect(Buffer *b)
     if(m_soxr && b->samples > 0)
     {
         size_t done = 0;
-        soxr_process(m_soxr, b->data, b->samples / channels(), 0,
+        soxr_process(m_soxr, b->data, b->samples / channels(), nullptr,
                      m_out, m_out_samples / channels(), &done);
 
         b->samples = done * channels();
@@ -64,8 +64,8 @@ void SoXResampler::configure(quint32 freq, ChannelMap map)
     freeSoXR();
     if(freq != m_overSamplingFs)
     {
-        soxr_error_t error = 0;
-        m_soxr = soxr_create(freq, m_overSamplingFs, map.count(), &error, 0, &m_quality, 0);
+        soxr_error_t error = nullptr;
+        m_soxr = soxr_create(freq, m_overSamplingFs, map.count(), &error, nullptr, &m_quality, nullptr);
         double ratio = (double)m_overSamplingFs/freq;
         m_out_samples = ratio * QMMP_BLOCK_FRAMES * map.count() * 2 + 2;
         m_out = new float[m_out_samples];
@@ -78,12 +78,12 @@ void SoXResampler::freeSoXR()
     if(m_soxr)
     {
         soxr_delete(m_soxr);
-        m_soxr = 0;
+        m_soxr = nullptr;
     }
     if(m_out)
     {
         delete [] m_out;
-        m_out = 0;
+        m_out = nullptr;
         m_out_samples = 0;
     }
 }
diff --git a/src/plugins/Effect/stereo/settingsdialog.h b/src/plugins/Effect/stereo/settingsdialog.h
index 7a896d1d8..f637430f9 100644
--- a/src/plugins/Effect/stereo/settingsdialog.h
+++ b/src/plugins/Effect/stereo/settingsdialog.h
@@ -30,7 +30,7 @@ class SettingsDialog : public QDialog
 {
 Q_OBJECT
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
 
     ~SettingsDialog();
 
diff --git a/src/plugins/Effect/stereo/stereoplugin.cpp b/src/plugins/Effect/stereo/stereoplugin.cpp
index e0fc6ed05..e4b90aa83 100644
--- a/src/plugins/Effect/stereo/stereoplugin.cpp
+++ b/src/plugins/Effect/stereo/stereoplugin.cpp
@@ -26,7 +26,7 @@
 #include <qmmp/qmmp.h>
 #include "stereoplugin.h"
 
-StereoPlugin *StereoPlugin::m_instance = 0;
+StereoPlugin *StereoPlugin::m_instance = nullptr;
 
 StereoPlugin::StereoPlugin() : Effect()
 {
@@ -43,7 +43,7 @@ StereoPlugin::StereoPlugin() : Effect()
 
 StereoPlugin::~StereoPlugin()
 {
-    m_instance = 0;
+    m_instance = nullptr;
 }
 
 void StereoPlugin::applyEffect(Buffer *b)
diff --git a/src/plugins/Engines/mplayer/mplayerengine.cpp b/src/plugins/Engines/mplayer/mplayerengine.cpp
index dbd01b871..4b1741b0d 100644
--- a/src/plugins/Engines/mplayer/mplayerengine.cpp
+++ b/src/plugins/Engines/mplayer/mplayerengine.cpp
@@ -97,7 +97,7 @@ QStringList MplayerInfo::filters()
 MplayerEngine::MplayerEngine(QObject *parent)
         : AbstractEngine(parent)
 {
-    m_source = 0;
+    m_source = nullptr;
     m_bitrate = 0;
     m_samplerate = 0;
     m_channels = 0;
@@ -106,7 +106,7 @@ MplayerEngine::MplayerEngine(QObject *parent)
     m_currentTime = 0;
     m_muted = false;
     m_user_stop = false;
-    m_process = 0;
+    m_process = nullptr;
 }
 
 MplayerEngine::~MplayerEngine()
@@ -297,7 +297,7 @@ void MplayerEngine::startMplayerProcess()
     StateHandler::instance()->dispatch(*info);
     delete info;
     m_source->deleteLater();
-    m_source = 0;
+    m_source = nullptr;
     m_currentTime = 0;
     if(m_muted)
         setMuted(true);
diff --git a/src/plugins/Engines/mplayer/mplayerenginefactory.h b/src/plugins/Engines/mplayer/mplayerenginefactory.h
index 19d822d5e..d57081d0e 100644
--- a/src/plugins/Engines/mplayer/mplayerenginefactory.h
+++ b/src/plugins/Engines/mplayer/mplayerenginefactory.h
@@ -31,7 +31,7 @@ Q_INTERFACES(EngineFactory)
 public:
     EngineProperties properties() const;
     bool supports(const QString &source) const;
-    AbstractEngine *create(QObject *parent = 0);
+    AbstractEngine *create(QObject *parent = nullptr);
     QList<TrackInfo *> createPlayList(const QString &path, TrackInfo::Parts parts, QStringList *);
     MetaDataModel* createMetaDataModel(const QString &path, bool readOnly);
     void showSettings(QWidget *parent);
diff --git a/src/plugins/Engines/mplayer/settingsdialog.h b/src/plugins/Engines/mplayer/settingsdialog.h
index 4f4559e49..902e55f63 100644
--- a/src/plugins/Engines/mplayer/settingsdialog.h
+++ b/src/plugins/Engines/mplayer/settingsdialog.h
@@ -30,7 +30,7 @@ class SettingsDialog : public QDialog
 {
 Q_OBJECT
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
 
     ~SettingsDialog();
 
diff --git a/src/plugins/FileDialogs/QmmpFileDialog/qmmpfiledialogimpl.cpp b/src/plugins/FileDialogs/QmmpFileDialog/qmmpfiledialogimpl.cpp
index 7c3388c7d..a433ded9e 100644
--- a/src/plugins/FileDialogs/QmmpFileDialog/qmmpfiledialogimpl.cpp
+++ b/src/plugins/FileDialogs/QmmpFileDialog/qmmpfiledialogimpl.cpp
@@ -90,7 +90,7 @@ QmmpFileDialogImpl::QmmpFileDialogImpl(QWidget * parent, Qt::WindowFlags f) : QD
     QCompleter* dir_completer = new QCompleter (m_model, this);
     lookInComboBox->setCompleter (dir_completer);
 
-    if(qApp->style()->styleHint(QStyle::SH_DialogButtonBox_ButtonsHaveIcons, 0, this))
+    if(qApp->style()->styleHint(QStyle::SH_DialogButtonBox_ButtonsHaveIcons, nullptr, this))
     {
         addPushButton->setIcon(qApp->style()->standardIcon(QStyle::SP_DialogOpenButton));
         closePushButton->setIcon(qApp->style()->standardIcon(QStyle::SP_DialogCloseButton));
diff --git a/src/plugins/FileDialogs/QmmpFileDialog/qmmpfiledialogimpl.h b/src/plugins/FileDialogs/QmmpFileDialog/qmmpfiledialogimpl.h
index 6b3463fdc..60fe51d85 100644
--- a/src/plugins/FileDialogs/QmmpFileDialog/qmmpfiledialogimpl.h
+++ b/src/plugins/FileDialogs/QmmpFileDialog/qmmpfiledialogimpl.h
@@ -33,7 +33,7 @@ class QmmpFileDialogImpl : public QDialog , private Ui::QmmpFileDialog
 {
     Q_OBJECT
 public:
-    QmmpFileDialogImpl(QWidget *parent = 0, Qt::WindowFlags f = 0);
+    QmmpFileDialogImpl(QWidget *parent = nullptr, Qt::WindowFlags f = Qt::WindowFlags());
 
     ~QmmpFileDialogImpl();
 
@@ -76,7 +76,7 @@ class PathCompleter : public QCompleter
 {
     Q_OBJECT
 public:
-    PathCompleter(QAbstractItemModel *model, QAbstractItemView *itemView, QObject *parent = 0) : QCompleter(model, parent)
+    PathCompleter(QAbstractItemModel *model, QAbstractItemView *itemView, QObject *parent = nullptr) : QCompleter(model, parent)
     {
         m_itemView = itemView;
     };
diff --git a/src/plugins/FileDialogs/TwoPanelFileDialog/twopanelfiledialogimpl.cpp b/src/plugins/FileDialogs/TwoPanelFileDialog/twopanelfiledialogimpl.cpp
index 09828fc11..8ae32f3ac 100644
--- a/src/plugins/FileDialogs/TwoPanelFileDialog/twopanelfiledialogimpl.cpp
+++ b/src/plugins/FileDialogs/TwoPanelFileDialog/twopanelfiledialogimpl.cpp
@@ -80,7 +80,7 @@ TwoPanelFileDialogImpl::TwoPanelFileDialogImpl(QWidget * parent) : QDialog(paren
     QCompleter* dirCompleter = new QCompleter (m_dirModel, this);
     m_ui.lookInComboBox->setCompleter (dirCompleter);
 
-    if(qApp->style()->styleHint(QStyle::SH_DialogButtonBox_ButtonsHaveIcons, 0, this))
+    if(qApp->style()->styleHint(QStyle::SH_DialogButtonBox_ButtonsHaveIcons, nullptr, this))
     {
         m_ui.playButton->setIcon(qApp->style()->standardIcon(QStyle::SP_MediaPlay));
         m_ui.addButton->setIcon(qApp->style()->standardIcon(QStyle::SP_DialogOpenButton));
diff --git a/src/plugins/FileDialogs/TwoPanelFileDialog/twopanelfiledialogimpl.h b/src/plugins/FileDialogs/TwoPanelFileDialog/twopanelfiledialogimpl.h
index e42ae3b87..09f3c0e5f 100644
--- a/src/plugins/FileDialogs/TwoPanelFileDialog/twopanelfiledialogimpl.h
+++ b/src/plugins/FileDialogs/TwoPanelFileDialog/twopanelfiledialogimpl.h
@@ -35,7 +35,7 @@ class TwoPanelFileDialogImpl : public QDialog
 {
     Q_OBJECT
 public:
-    TwoPanelFileDialogImpl(QWidget *parent = 0);
+    TwoPanelFileDialogImpl(QWidget *parent = nullptr);
 
     ~TwoPanelFileDialogImpl();
 
@@ -73,7 +73,7 @@ class PathCompleter : public QCompleter
 {
     Q_OBJECT
 public:
-    PathCompleter(QAbstractItemModel *model, QAbstractItemView *itemView, QObject *parent = 0) : QCompleter(model, parent)
+    PathCompleter(QAbstractItemModel *model, QAbstractItemView *itemView, QObject *parent = nullptr) : QCompleter(model, parent)
     {
         m_itemView = itemView;
     }
diff --git a/src/plugins/General/converter/converter.cpp b/src/plugins/General/converter/converter.cpp
index d5e39c8a0..b4e693211 100644
--- a/src/plugins/General/converter/converter.cpp
+++ b/src/plugins/General/converter/converter.cpp
@@ -36,8 +36,8 @@
 Converter::Converter(QObject *parent) : QObject(parent), QRunnable()
 {
     m_user_stop = false;
-    m_decoder = 0;
-    m_input = 0;
+    m_decoder = nullptr;
+    m_input = nullptr;
     m_row = -1;
 }
 
@@ -47,12 +47,12 @@ Converter::~Converter()
     if(m_decoder)
     {
         delete m_decoder;
-        m_decoder = 0;
+        m_decoder = nullptr;
     }
     if(m_input)
     {
         delete m_input;
-        m_input = 0;
+        m_input = nullptr;
     }
 }
 
@@ -78,7 +78,7 @@ bool Converter::prepare(const QString &url, int row, const QVariantMap &preset)
         }
     }
 
-    DecoderFactory *factory = 0;
+    DecoderFactory *factory = nullptr;
 
     if(!source->path().contains("://"))
         factory = Decoder::findByFilePath(source->path());
diff --git a/src/plugins/General/converter/converter.h b/src/plugins/General/converter/converter.h
index 94571f11b..f35a4251c 100644
--- a/src/plugins/General/converter/converter.h
+++ b/src/plugins/General/converter/converter.h
@@ -38,7 +38,7 @@ class Converter : public QObject, public QRunnable
 {
     Q_OBJECT
 public:
-    explicit Converter(QObject *parent = 0);
+    explicit Converter(QObject *parent = nullptr);
     virtual ~Converter();
 
     bool prepare(const QString &url, int row, const QVariantMap &preset);
diff --git a/src/plugins/General/converter/converterdialog.h b/src/plugins/General/converter/converterdialog.h
index edde11558..6bc6f066e 100644
--- a/src/plugins/General/converter/converterdialog.h
+++ b/src/plugins/General/converter/converterdialog.h
@@ -37,7 +37,7 @@ class ConverterDialog : public QDialog
 {
     Q_OBJECT
 public:
-    explicit ConverterDialog(QList <PlayListTrack *> items,  QWidget *parent = 0);
+    explicit ConverterDialog(QList <PlayListTrack *> items,  QWidget *parent = nullptr);
     virtual ~ConverterDialog();
 
 public slots:
diff --git a/src/plugins/General/converter/converterfactory.cpp b/src/plugins/General/converter/converterfactory.cpp
index c48deae30..dc37f53e8 100644
--- a/src/plugins/General/converter/converterfactory.cpp
+++ b/src/plugins/General/converter/converterfactory.cpp
@@ -41,7 +41,7 @@ QObject *ConverterFactory::create(QObject *parent)
 QDialog *ConverterFactory::createConfigDialog(QWidget *parent)
 {
     Q_UNUSED(parent);
-    return 0;
+    return nullptr;
 }
 
 void ConverterFactory::showAbout(QWidget *parent)
diff --git a/src/plugins/General/converter/converterhelper.h b/src/plugins/General/converter/converterhelper.h
index a75ad6426..a9f3c5fcd 100644
--- a/src/plugins/General/converter/converterhelper.h
+++ b/src/plugins/General/converter/converterhelper.h
@@ -33,7 +33,7 @@ class ConverterHelper : public QObject
 {
 Q_OBJECT
 public:
-    ConverterHelper(QObject *parent = 0);
+    ConverterHelper(QObject *parent = nullptr);
 
     ~ConverterHelper();
 
diff --git a/src/plugins/General/converter/preseteditor.h b/src/plugins/General/converter/preseteditor.h
index c9dabc8f7..98786747c 100644
--- a/src/plugins/General/converter/preseteditor.h
+++ b/src/plugins/General/converter/preseteditor.h
@@ -36,7 +36,7 @@ class PresetEditor : public QDialog
     Q_OBJECT
 
 public:
-    explicit PresetEditor(const QVariantMap &data, QWidget *parent = 0);
+    explicit PresetEditor(const QVariantMap &data, QWidget *parent = nullptr);
     virtual ~PresetEditor();
 
     const QVariantMap data() const;
diff --git a/src/plugins/General/copypaste/copypaste.h b/src/plugins/General/copypaste/copypaste.h
index 3ac153da4..1935c8bd5 100644
--- a/src/plugins/General/copypaste/copypaste.h
+++ b/src/plugins/General/copypaste/copypaste.h
@@ -36,7 +36,7 @@ class CopyPaste : public QObject
 {
     Q_OBJECT
 public:
-    CopyPaste(QObject *parent = 0);
+    CopyPaste(QObject *parent = nullptr);
 
     ~CopyPaste();
 
diff --git a/src/plugins/General/copypaste/copypastefactory.cpp b/src/plugins/General/copypaste/copypastefactory.cpp
index 5c15895de..3b5403db6 100644
--- a/src/plugins/General/copypaste/copypastefactory.cpp
+++ b/src/plugins/General/copypaste/copypastefactory.cpp
@@ -41,7 +41,7 @@ QObject *CopyPasteFactory::create(QObject *parent)
 
 QDialog *CopyPasteFactory::createConfigDialog(QWidget *)
 {
-    return 0;
+    return nullptr;
 }
 
 void CopyPasteFactory::showAbout(QWidget *parent)
diff --git a/src/plugins/General/covermanager/covermanager.h b/src/plugins/General/covermanager/covermanager.h
index 729d79a40..773eb1034 100644
--- a/src/plugins/General/covermanager/covermanager.h
+++ b/src/plugins/General/covermanager/covermanager.h
@@ -33,7 +33,7 @@ class CoverManager : public QObject
 {
 Q_OBJECT
 public:
-    CoverManager(QObject *parent = 0);
+    CoverManager(QObject *parent = nullptr);
 
 private slots:
     void showWindow();
diff --git a/src/plugins/General/covermanager/covermanagerfactory.cpp b/src/plugins/General/covermanager/covermanagerfactory.cpp
index caae162f5..8ea7c8c6c 100644
--- a/src/plugins/General/covermanager/covermanagerfactory.cpp
+++ b/src/plugins/General/covermanager/covermanagerfactory.cpp
@@ -42,7 +42,7 @@ QObject *CoverManagerFactory::create(QObject *parent)
 
 QDialog *CoverManagerFactory::createConfigDialog(QWidget *)
 {
-    return 0;
+    return nullptr;
 }
 
 void CoverManagerFactory::showAbout(QWidget *parent)
diff --git a/src/plugins/General/covermanager/coverwidget.h b/src/plugins/General/covermanager/coverwidget.h
index d56404585..55ee9a2eb 100644
--- a/src/plugins/General/covermanager/coverwidget.h
+++ b/src/plugins/General/covermanager/coverwidget.h
@@ -34,7 +34,7 @@ class CoverWidget : public QWidget
 {
 Q_OBJECT
 public:
-    CoverWidget(QWidget *parent = 0);
+    CoverWidget(QWidget *parent = nullptr);
 
     ~CoverWidget();
 
diff --git a/src/plugins/General/fileops/fileops.h b/src/plugins/General/fileops/fileops.h
index f5a542f3a..0ad1fa27e 100644
--- a/src/plugins/General/fileops/fileops.h
+++ b/src/plugins/General/fileops/fileops.h
@@ -37,7 +37,7 @@ class FileOps : public QObject
 {
     Q_OBJECT
 public:
-    FileOps(QObject *parent = 0);
+    FileOps(QObject *parent = nullptr);
 
     ~FileOps();
 
diff --git a/src/plugins/General/fileops/hotkeydialog.h b/src/plugins/General/fileops/hotkeydialog.h
index ba63c7ce5..d68da11b6 100644
--- a/src/plugins/General/fileops/hotkeydialog.h
+++ b/src/plugins/General/fileops/hotkeydialog.h
@@ -33,7 +33,7 @@ class HotkeyDialog : public QDialog
 {
     Q_OBJECT
 public:
-    HotkeyDialog(const QString &key, QWidget *parent = 0);
+    HotkeyDialog(const QString &key, QWidget *parent = nullptr);
 
     ~HotkeyDialog();
 
diff --git a/src/plugins/General/fileops/settingsdialog.h b/src/plugins/General/fileops/settingsdialog.h
index 15d657802..41f4e4575 100644
--- a/src/plugins/General/fileops/settingsdialog.h
+++ b/src/plugins/General/fileops/settingsdialog.h
@@ -32,7 +32,7 @@ class SettingsDialog : public QDialog
 {
     Q_OBJECT
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
 
     ~SettingsDialog();
 
diff --git a/src/plugins/General/gnomehotkey/gnomehotkeyfactory.cpp b/src/plugins/General/gnomehotkey/gnomehotkeyfactory.cpp
index e22d2d9e9..af50b9e3f 100644
--- a/src/plugins/General/gnomehotkey/gnomehotkeyfactory.cpp
+++ b/src/plugins/General/gnomehotkey/gnomehotkeyfactory.cpp
@@ -42,7 +42,7 @@ QObject *GnomeHotkeyFactory::create(QObject *parent)
 QDialog *GnomeHotkeyFactory::createConfigDialog(QWidget *parent)
 {
     Q_UNUSED(parent);
-    return 0;
+    return nullptr;
 }
 
 void GnomeHotkeyFactory::showAbout(QWidget *parent)
diff --git a/src/plugins/General/gnomehotkey/mediakeys.cpp b/src/plugins/General/gnomehotkey/mediakeys.cpp
index 495380173..e4ae96155 100644
--- a/src/plugins/General/gnomehotkey/mediakeys.cpp
+++ b/src/plugins/General/gnomehotkey/mediakeys.cpp
@@ -33,7 +33,7 @@ MediaKeys::MediaKeys(QObject *parent) :
     QObject(parent)
 {
     m_isRegistered = false;
-    m_interface = 0;
+    m_interface = nullptr;
     if(!QDBusConnection::sessionBus().interface()->isServiceRegistered("org.gnome.SettingsDaemon"))
     {
         qWarning("MediaKeys: gnome settings daemon is not running");
diff --git a/src/plugins/General/gnomehotkey/mediakeys.h b/src/plugins/General/gnomehotkey/mediakeys.h
index 6533b3443..4fb0028fe 100644
--- a/src/plugins/General/gnomehotkey/mediakeys.h
+++ b/src/plugins/General/gnomehotkey/mediakeys.h
@@ -33,7 +33,7 @@ class MediaKeys : public QObject
 {
     Q_OBJECT
 public:
-    explicit MediaKeys(QObject *parent = 0);
+    explicit MediaKeys(QObject *parent = nullptr);
     virtual ~MediaKeys();
 
 private slots:
diff --git a/src/plugins/General/hal/haldevice.h b/src/plugins/General/hal/haldevice.h
index 934d7f8a1..08583fe0e 100644
--- a/src/plugins/General/hal/haldevice.h
+++ b/src/plugins/General/hal/haldevice.h
@@ -46,7 +46,7 @@ class HalDevice : public QObject
 {
     Q_OBJECT
 public:
-    HalDevice(const QString &udi, QObject *parent = 0);
+    HalDevice(const QString &udi, QObject *parent = nullptr);
 
     ~HalDevice();
 
diff --git a/src/plugins/General/hal/halmanager.h b/src/plugins/General/hal/halmanager.h
index ef81feab9..6c2eb2b8e 100644
--- a/src/plugins/General/hal/halmanager.h
+++ b/src/plugins/General/hal/halmanager.h
@@ -32,7 +32,7 @@ class HalManager : public QObject
 {
 Q_OBJECT
 public:
-    HalManager(QObject *parent = 0);
+    HalManager(QObject *parent = nullptr);
 
     ~HalManager();
 
diff --git a/src/plugins/General/hal/halplugin.cpp b/src/plugins/General/hal/halplugin.cpp
index cd4ee96de..d3477fec9 100644
--- a/src/plugins/General/hal/halplugin.cpp
+++ b/src/plugins/General/hal/halplugin.cpp
@@ -210,7 +210,7 @@ QAction *HalPlugin::findAction(const QString &dev_path)
         if (action->data().toString() == dev_path)
             return action;
     }
-    return 0;
+    return nullptr;
 }
 
 HalDevice *HalPlugin::findDevice(QAction *action)
@@ -232,7 +232,7 @@ HalDevice *HalPlugin::findDevice(QAction *action)
                 return device;
         }
     }
-    return 0;
+    return nullptr;
 }
 
 void HalPlugin::addPath(const QString &path)
diff --git a/src/plugins/General/hal/halplugin.h b/src/plugins/General/hal/halplugin.h
index e618a1e76..9a2169f3a 100644
--- a/src/plugins/General/hal/halplugin.h
+++ b/src/plugins/General/hal/halplugin.h
@@ -36,7 +36,7 @@ class HalPlugin : public QObject
 {
 Q_OBJECT
 public:
-    HalPlugin(QObject *parent = 0);
+    HalPlugin(QObject *parent = nullptr);
 
     ~HalPlugin();
 
diff --git a/src/plugins/General/hal/settingsdialog.h b/src/plugins/General/hal/settingsdialog.h
index 6bd6b602f..604483326 100644
--- a/src/plugins/General/hal/settingsdialog.h
+++ b/src/plugins/General/hal/settingsdialog.h
@@ -31,7 +31,7 @@ class SettingsDialog : public QDialog
 {
 Q_OBJECT
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
 
     ~SettingsDialog();
 
diff --git a/src/plugins/General/history/dateinputdialog.h b/src/plugins/General/history/dateinputdialog.h
index 2259de255..1bcb64e68 100644
--- a/src/plugins/General/history/dateinputdialog.h
+++ b/src/plugins/General/history/dateinputdialog.h
@@ -33,7 +33,7 @@ class DateInputDialog : public QDialog
     Q_OBJECT
 
 public:
-    explicit DateInputDialog(QWidget *parent = 0);
+    explicit DateInputDialog(QWidget *parent = nullptr);
     ~DateInputDialog();
 
     QDate selectedDate() const;
diff --git a/src/plugins/General/history/history.h b/src/plugins/General/history/history.h
index 07d65be0c..d044bc0ae 100644
--- a/src/plugins/General/history/history.h
+++ b/src/plugins/General/history/history.h
@@ -36,7 +36,7 @@ class History : public QObject
 {
     Q_OBJECT
 public:
-    explicit History(QObject *parent = 0);
+    explicit History(QObject *parent = nullptr);
     ~History();
 
 private slots:
diff --git a/src/plugins/General/history/historysettingsdialog.h b/src/plugins/General/history/historysettingsdialog.h
index b21e03cd7..f9efef1b5 100644
--- a/src/plugins/General/history/historysettingsdialog.h
+++ b/src/plugins/General/history/historysettingsdialog.h
@@ -32,7 +32,7 @@ class HistorySettingsDialog : public QDialog
     Q_OBJECT
 
 public:
-    explicit HistorySettingsDialog(QWidget *parent = 0);
+    explicit HistorySettingsDialog(QWidget *parent = nullptr);
     ~HistorySettingsDialog();
 
 public slots:
diff --git a/src/plugins/General/history/historywindow.h b/src/plugins/General/history/historywindow.h
index 7736b5e7d..88d81e887 100644
--- a/src/plugins/General/history/historywindow.h
+++ b/src/plugins/General/history/historywindow.h
@@ -35,7 +35,7 @@ class HistoryWindow : public QWidget
 {
     Q_OBJECT
 public:
-    explicit HistoryWindow(QSqlDatabase db, QWidget *parent = 0);
+    explicit HistoryWindow(QSqlDatabase db, QWidget *parent = nullptr);
     ~HistoryWindow();
 
 private slots:
diff --git a/src/plugins/General/history/progressbaritemdelegate.h b/src/plugins/General/history/progressbaritemdelegate.h
index 9e8cf8e50..2eef87b91 100644
--- a/src/plugins/General/history/progressbaritemdelegate.h
+++ b/src/plugins/General/history/progressbaritemdelegate.h
@@ -35,7 +35,7 @@ class ProgressBarItemDelegate : public QStyledItemDelegate
 {
     Q_OBJECT
 public:
-    explicit ProgressBarItemDelegate(QObject *parent = 0);
+    explicit ProgressBarItemDelegate(QObject *parent = nullptr);
 
     void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const;
     QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const;
diff --git a/src/plugins/General/hotkey/hotkeydialog.h b/src/plugins/General/hotkey/hotkeydialog.h
index 4124e8c8f..4bae2d01b 100644
--- a/src/plugins/General/hotkey/hotkeydialog.h
+++ b/src/plugins/General/hotkey/hotkeydialog.h
@@ -33,7 +33,7 @@ class HotkeyDialog : public QDialog
 {
     Q_OBJECT
 public:
-    HotkeyDialog(quint32 key, quint32 mod, QWidget *parent = 0);
+    HotkeyDialog(quint32 key, quint32 mod, QWidget *parent = nullptr);
 
     ~HotkeyDialog();
 
diff --git a/src/plugins/General/hotkey/hotkeymanager.h b/src/plugins/General/hotkey/hotkeymanager.h
index ec5278982..45692cf1e 100644
--- a/src/plugins/General/hotkey/hotkeymanager.h
+++ b/src/plugins/General/hotkey/hotkeymanager.h
@@ -70,7 +70,7 @@ class HotkeyManager : public QObject, public QAbstractNativeEventFilter
 {
     Q_OBJECT
 public:
-    HotkeyManager(QObject *parent = 0);
+    HotkeyManager(QObject *parent = nullptr);
 
     ~HotkeyManager();
 
diff --git a/src/plugins/General/hotkey/settingsdialog.cpp b/src/plugins/General/hotkey/settingsdialog.cpp
index 2830e58ee..7a5bd612d 100644
--- a/src/plugins/General/hotkey/settingsdialog.cpp
+++ b/src/plugins/General/hotkey/settingsdialog.cpp
@@ -86,7 +86,7 @@ void SettingsDialog::accept()
 
 void SettingsDialog::on_tableWidget_itemDoubleClicked (QTableWidgetItem *item)
 {
-    Hotkey *k = 0;
+    Hotkey *k = nullptr;
     foreach(k, m_hotkeys)
     {
         if (k->action == item->type())
diff --git a/src/plugins/General/hotkey/settingsdialog.h b/src/plugins/General/hotkey/settingsdialog.h
index e1fde23ec..da947e681 100644
--- a/src/plugins/General/hotkey/settingsdialog.h
+++ b/src/plugins/General/hotkey/settingsdialog.h
@@ -32,7 +32,7 @@ class SettingsDialog : public QDialog
 {
 Q_OBJECT
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
 
     ~SettingsDialog();
 
diff --git a/src/plugins/General/kdenotify/kdenotify.h b/src/plugins/General/kdenotify/kdenotify.h
index c75696443..b82dd1e5d 100644
--- a/src/plugins/General/kdenotify/kdenotify.h
+++ b/src/plugins/General/kdenotify/kdenotify.h
@@ -36,7 +36,7 @@ class KdeNotify : public QObject
 {
     Q_OBJECT
 public:
-    KdeNotify(QObject *parent = 0);
+    KdeNotify(QObject *parent = nullptr);
     ~KdeNotify();
 
 private:
diff --git a/src/plugins/General/kdenotify/settingsdialog.h b/src/plugins/General/kdenotify/settingsdialog.h
index 3ec2baf8a..835a39ad0 100644
--- a/src/plugins/General/kdenotify/settingsdialog.h
+++ b/src/plugins/General/kdenotify/settingsdialog.h
@@ -32,7 +32,7 @@ class SettingsDialog : public QDialog
 Q_OBJECT
 
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
     ~SettingsDialog();
 
 public slots:
diff --git a/src/plugins/General/lyrics/lyrics.h b/src/plugins/General/lyrics/lyrics.h
index 663fe4af5..16523a30e 100644
--- a/src/plugins/General/lyrics/lyrics.h
+++ b/src/plugins/General/lyrics/lyrics.h
@@ -37,7 +37,7 @@ class Lyrics : public QObject
 {
 Q_OBJECT
 public:
-    Lyrics(QObject *parent = 0);
+    Lyrics(QObject *parent = nullptr);
 
     ~Lyrics();
 
diff --git a/src/plugins/General/lyrics/lyricsfactory.cpp b/src/plugins/General/lyrics/lyricsfactory.cpp
index 1b5cac3e2..aef4322f9 100644
--- a/src/plugins/General/lyrics/lyricsfactory.cpp
+++ b/src/plugins/General/lyrics/lyricsfactory.cpp
@@ -42,7 +42,7 @@ QObject *LyricsFactory::create(QObject *parent)
 QDialog *LyricsFactory::createConfigDialog(QWidget *parent)
 {
     Q_UNUSED(parent);
-    return 0;
+    return nullptr;
 }
 
 void LyricsFactory::showAbout(QWidget *parent)
diff --git a/src/plugins/General/lyrics/lyricswindow.cpp b/src/plugins/General/lyrics/lyricswindow.cpp
index 39626c1ec..fa26ca049 100644
--- a/src/plugins/General/lyrics/lyricswindow.cpp
+++ b/src/plugins/General/lyrics/lyricswindow.cpp
@@ -37,7 +37,7 @@ LyricsWindow::LyricsWindow(const QString &artist, const QString &title, QWidget
     setWindowFlags(Qt::Dialog);
     setAttribute(Qt::WA_DeleteOnClose);
     setAttribute(Qt::WA_QuitOnClose, false);
-    m_requestReply = 0;
+    m_requestReply = nullptr;
     m_cachePath = Qmmp::configDir() + "/lyrics/";
     m_ui.artistLineEdit->setText(artist);
     m_ui.titleLineEdit->setText(title);
@@ -78,7 +78,7 @@ void LyricsWindow::showText(QNetworkReply *reply)
     {
         m_ui.stateLabel->setText(tr("Error"));
         m_ui.textBrowser->setText(reply->errorString());
-        m_requestReply = 0;
+        m_requestReply = nullptr;
         reply->deleteLater();
         return;
     }
@@ -87,7 +87,7 @@ void LyricsWindow::showText(QNetworkReply *reply)
 
     if(m_requestReply == reply)
     {
-        m_requestReply = 0;
+        m_requestReply = nullptr;
         reply->deleteLater();
         QRegExp artist_regexp("<artist>(.*)</artist>");
         artist_regexp.setMinimal(true);
diff --git a/src/plugins/General/lyrics/lyricswindow.h b/src/plugins/General/lyrics/lyricswindow.h
index 7ccec881f..564fb5a10 100644
--- a/src/plugins/General/lyrics/lyricswindow.h
+++ b/src/plugins/General/lyrics/lyricswindow.h
@@ -34,7 +34,7 @@ class LyricsWindow : public QWidget
 {
 Q_OBJECT
 public:
-    LyricsWindow(const QString &artist, const QString &title, QWidget *parent = 0);
+    LyricsWindow(const QString &artist, const QString &title, QWidget *parent = nullptr);
 
     ~LyricsWindow();
 
diff --git a/src/plugins/General/mpris/mpris.h b/src/plugins/General/mpris/mpris.h
index c6bffef50..a13ce2d96 100644
--- a/src/plugins/General/mpris/mpris.h
+++ b/src/plugins/General/mpris/mpris.h
@@ -33,7 +33,7 @@ class MPRIS : public QObject
 {
 Q_OBJECT
 public:
-    MPRIS(QObject *parent = 0);
+    MPRIS(QObject *parent = nullptr);
 
     ~MPRIS();
 };
diff --git a/src/plugins/General/mpris/mpris2/player2object.cpp b/src/plugins/General/mpris/mpris2/player2object.cpp
index 962d8a618..aae3cdda6 100644
--- a/src/plugins/General/mpris/mpris2/player2object.cpp
+++ b/src/plugins/General/mpris/mpris2/player2object.cpp
@@ -32,7 +32,7 @@
 
 Player2Object::Player2Object(QObject *parent) : QDBusAbstractAdaptor(parent)
 {
-    m_prev_track = 0;
+    m_prev_track = nullptr;
     m_previous_pos = 0;
     m_core = SoundCore::instance();
     m_player = MediaPlayer::instance();
@@ -49,7 +49,7 @@ Player2Object::Player2Object(QObject *parent) : QDBusAbstractAdaptor(parent)
     connect(m_ui_settings, SIGNAL(shuffleChanged(bool)), SLOT(emitPropertiesChanged()));
     connect(m_pl_manager, SIGNAL(currentPlayListChanged(PlayListModel*,PlayListModel*)),
             SLOT(setModel(PlayListModel*,PlayListModel*)));
-    setModel(m_pl_manager->currentPlayList(), 0);
+    setModel(m_pl_manager->currentPlayList(), nullptr);
     updateId();
     syncProperties();
 }
@@ -64,7 +64,7 @@ bool Player2Object::canControl() const
 
 bool Player2Object::canGoNext() const
 {
-    return m_pl_manager->currentPlayList()->nextTrack() != 0;
+    return m_pl_manager->currentPlayList()->nextTrack() != nullptr;
 }
 
 bool Player2Object::canGoPrevious() const
@@ -371,7 +371,7 @@ void Player2Object::disconnectPl()
 void Player2Object::setModel(PlayListModel *selected, PlayListModel *previous)
 {
     if(previous)
-        disconnect(previous, 0, this, 0); //disconnect previous model
+        disconnect(previous, nullptr, this, nullptr); //disconnect previous model
     connect(selected, SIGNAL(listChanged(int)), SLOT(emitPropertiesChanged()));
 }
 
diff --git a/src/plugins/General/mpris/mpris2/player2object.h b/src/plugins/General/mpris/mpris2/player2object.h
index 901364181..af69844a4 100644
--- a/src/plugins/General/mpris/mpris2/player2object.h
+++ b/src/plugins/General/mpris/mpris2/player2object.h
@@ -58,7 +58,7 @@ Q_PROPERTY(bool Shuffle READ shuffle WRITE setShuffle)
 Q_PROPERTY(double Volume READ volume WRITE setVolume)
 
 public:
-    Player2Object(QObject *parent = 0);
+    Player2Object(QObject *parent = nullptr);
     virtual ~Player2Object();
     bool canControl() const;
     bool canGoNext() const;
diff --git a/src/plugins/General/mpris/mpris2/root2object.h b/src/plugins/General/mpris/mpris2/root2object.h
index c7b39892b..762e04655 100644
--- a/src/plugins/General/mpris/mpris2/root2object.h
+++ b/src/plugins/General/mpris/mpris2/root2object.h
@@ -39,7 +39,7 @@ Q_PROPERTY(QStringList SupportedMimeTypes READ supportedMimeTypes)
 Q_PROPERTY(QStringList SupportedUriSchemes READ supportedUriSchemes)
 
 public:
-    Root2Object(QObject *parent = 0);
+    Root2Object(QObject *parent = nullptr);
     virtual ~Root2Object();
 
     bool canQuit() const;
diff --git a/src/plugins/General/mpris/mprisfactory.cpp b/src/plugins/General/mpris/mprisfactory.cpp
index a43139505..338b8f302 100644
--- a/src/plugins/General/mpris/mprisfactory.cpp
+++ b/src/plugins/General/mpris/mprisfactory.cpp
@@ -42,7 +42,7 @@ QObject *MPRISFactory::create(QObject *parent)
 
 QDialog *MPRISFactory::createConfigDialog(QWidget *)
 {
-    return 0;
+    return nullptr;
 }
 
 void MPRISFactory::showAbout(QWidget *parent)
diff --git a/src/plugins/General/notifier/notifier.cpp b/src/plugins/General/notifier/notifier.cpp
index 20b5b6195..127d9adf6 100644
--- a/src/plugins/General/notifier/notifier.cpp
+++ b/src/plugins/General/notifier/notifier.cpp
@@ -41,7 +41,7 @@
 
 Notifier::Notifier(QObject *parent) : QObject(parent)
 {
-    m_popupWidget = 0;
+    m_popupWidget = nullptr;
     m_l = -1;
     m_r = -1;
     m_isPaused = false;
diff --git a/src/plugins/General/notifier/notifier.h b/src/plugins/General/notifier/notifier.h
index 6b0317b30..c612711e7 100644
--- a/src/plugins/General/notifier/notifier.h
+++ b/src/plugins/General/notifier/notifier.h
@@ -36,7 +36,7 @@ class Notifier : public QObject
 {
 Q_OBJECT
 public:
-    Notifier(QObject *parent = 0);
+    Notifier(QObject *parent = nullptr);
 
     virtual~Notifier();
 
diff --git a/src/plugins/General/notifier/popupwidget.h b/src/plugins/General/notifier/popupwidget.h
index f06b4c4d3..6c685c482 100644
--- a/src/plugins/General/notifier/popupwidget.h
+++ b/src/plugins/General/notifier/popupwidget.h
@@ -36,7 +36,7 @@ class PopupWidget : public QFrame
 {
     Q_OBJECT
 public:
-    PopupWidget(QWidget *parent = 0);
+    PopupWidget(QWidget *parent = nullptr);
 
     ~PopupWidget();
 
diff --git a/src/plugins/General/notifier/settingsdialog.h b/src/plugins/General/notifier/settingsdialog.h
index fda8434c4..80a7284f2 100644
--- a/src/plugins/General/notifier/settingsdialog.h
+++ b/src/plugins/General/notifier/settingsdialog.h
@@ -32,7 +32,7 @@ class SettingsDialog : public QDialog
 {
 Q_OBJECT
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
 
     virtual ~SettingsDialog();
 
diff --git a/src/plugins/General/rdetect/settingsdialog.h b/src/plugins/General/rdetect/settingsdialog.h
index 85ab9ed4b..ff033adcc 100644
--- a/src/plugins/General/rdetect/settingsdialog.h
+++ b/src/plugins/General/rdetect/settingsdialog.h
@@ -30,7 +30,7 @@ class SettingsDialog : public QDialog
 {
 Q_OBJECT
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
 
     ~SettingsDialog();
 
diff --git a/src/plugins/General/rgscan/rgscandialog.cpp b/src/plugins/General/rgscan/rgscandialog.cpp
index c2814b60c..0818ee26d 100644
--- a/src/plugins/General/rgscan/rgscandialog.cpp
+++ b/src/plugins/General/rgscan/rgscandialog.cpp
@@ -270,7 +270,7 @@ RGScanner *RGScanDialog::findScannerByUrl(const QString &url)
         if(scanner->url() == url)
             return scanner;
     }
-    return 0;
+    return nullptr;
 }
 
 QString RGScanDialog::getAlbumName(const QString &url)
diff --git a/src/plugins/General/rgscan/rgscandialog.h b/src/plugins/General/rgscan/rgscandialog.h
index 18dcda9ad..22f5e457b 100644
--- a/src/plugins/General/rgscan/rgscandialog.h
+++ b/src/plugins/General/rgscan/rgscandialog.h
@@ -61,7 +61,7 @@ class RGScanDialog : public QDialog
 {
     Q_OBJECT
 public:
-    explicit RGScanDialog(QList <PlayListTrack *> tracks,  QWidget *parent = 0);
+    explicit RGScanDialog(QList <PlayListTrack *> tracks,  QWidget *parent = nullptr);
     virtual ~RGScanDialog();
 
 private slots:
diff --git a/src/plugins/General/rgscan/rgscanfactory.cpp b/src/plugins/General/rgscan/rgscanfactory.cpp
index 9e68e89a9..18998ac2c 100644
--- a/src/plugins/General/rgscan/rgscanfactory.cpp
+++ b/src/plugins/General/rgscan/rgscanfactory.cpp
@@ -41,7 +41,7 @@ QObject *RGScanFactory::create(QObject *parent)
 QDialog *RGScanFactory::createConfigDialog(QWidget *parent)
 {
     Q_UNUSED(parent);
-    return 0;
+    return nullptr;
 }
 
 void RGScanFactory::showAbout(QWidget *parent)
diff --git a/src/plugins/General/rgscan/rgscanhelper.h b/src/plugins/General/rgscan/rgscanhelper.h
index bc67a700b..e68f857a0 100644
--- a/src/plugins/General/rgscan/rgscanhelper.h
+++ b/src/plugins/General/rgscan/rgscanhelper.h
@@ -33,7 +33,7 @@ class RGScanHelper : public QObject
 {
 Q_OBJECT
 public:
-    RGScanHelper(QObject *parent = 0);
+    RGScanHelper(QObject *parent = nullptr);
     ~RGScanHelper();
 
 private slots:
diff --git a/src/plugins/General/rgscan/rgscanner.cpp b/src/plugins/General/rgscan/rgscanner.cpp
index e1311bd97..13ff79cdf 100644
--- a/src/plugins/General/rgscan/rgscanner.cpp
+++ b/src/plugins/General/rgscan/rgscanner.cpp
@@ -35,9 +35,9 @@ RGScanner::RGScanner()
     m_is_running = false;
     m_is_pending = false;
     m_has_values = false;
-    m_handle = 0;
-    m_decoder = 0;
-    m_source = 0;
+    m_handle = nullptr;
+    m_decoder = nullptr;
+    m_source = nullptr;
 }
 
 RGScanner::~RGScanner()
@@ -47,7 +47,7 @@ RGScanner::~RGScanner()
     if(m_handle)
     {
         DeinitGainAnalysis(m_handle);
-        m_handle = 0;
+        m_handle = nullptr;
     }
 }
 
@@ -57,7 +57,7 @@ bool RGScanner::prepare(const QString &url)
     deinit();
     m_url = url;
     QString name = m_url.section("/", -1);
-    InputSource *source = InputSource::create(url, 0);
+    InputSource *source = InputSource::create(url, nullptr);
     if(!source->initialize())
     {
         delete source;
@@ -273,11 +273,11 @@ void RGScanner::deinit()
     if(m_decoder)
     {
         delete m_decoder;
-        m_decoder = 0;
+        m_decoder = nullptr;
     }
     if(m_source)
     {
         delete m_source;
-        m_source = 0;
+        m_source = nullptr;
     }
 }
diff --git a/src/plugins/General/scrobbler/scrobbler.cpp b/src/plugins/General/scrobbler/scrobbler.cpp
index 468a88bd6..6082b237a 100644
--- a/src/plugins/General/scrobbler/scrobbler.cpp
+++ b/src/plugins/General/scrobbler/scrobbler.cpp
@@ -82,9 +82,9 @@ void ScrobblerResponse::parse(QIODevice *device)
 Scrobbler::Scrobbler(const QString &scrobblerUrl, const QString &name, QObject *parent)
     : QObject(parent)
 {
-    m_notificationReply = 0;
+    m_notificationReply = nullptr;
     m_submitedSongs = 0;
-    m_submitReply = 0;
+    m_submitReply = nullptr;
     m_previousState = Qmmp::Stopped;
     m_elapsed = 0;
     m_scrobblerUrl = scrobblerUrl;
@@ -211,7 +211,7 @@ void Scrobbler::processResponse(QNetworkReply *reply)
 
     if (reply == m_submitReply)
     {
-        m_submitReply = 0;
+        m_submitReply = nullptr;
         if (response.status == "ok")
         {
             qDebug("Scrobbler[%s]: submited %d song(s)", qPrintable(m_name), m_submitedSongs);
@@ -248,7 +248,7 @@ void Scrobbler::processResponse(QNetworkReply *reply)
     }
     else if (reply == m_notificationReply)
     {
-        m_notificationReply = 0;
+        m_notificationReply = nullptr;
         if(response.status == "ok")
         {
             qDebug("Scrobbler[%s]: Now-Playing notification done", qPrintable(m_name));
@@ -386,8 +386,8 @@ void Scrobbler::sendNotification(const SongInfo &info)
 ScrobblerAuth::ScrobblerAuth(const QString &scrobblerUrl, const QString &authUrl,
                              const QString &name, QObject *parent) : QObject(parent)
 {
-    m_getTokenReply = 0;
-    m_getSessionReply = 0;
+    m_getTokenReply = nullptr;
+    m_getSessionReply = nullptr;
     m_scrobblerUrl = scrobblerUrl;
     m_authUrl = authUrl;
     m_name = name;
@@ -522,7 +522,7 @@ void ScrobblerAuth::processResponse(QNetworkReply *reply)
 
     if (reply == m_getTokenReply)
     {
-        m_getTokenReply = 0;
+        m_getTokenReply = nullptr;
         if(response.status == "ok")
         {
             m_token = response.token;
@@ -548,7 +548,7 @@ void ScrobblerAuth::processResponse(QNetworkReply *reply)
     }
     else if(reply == m_getSessionReply)
     {
-        m_getSessionReply = 0;
+        m_getSessionReply = nullptr;
         m_session.clear();
         if(response.status == "ok")
         {
@@ -586,7 +586,7 @@ void ScrobblerAuth::processResponse(QNetworkReply *reply)
     }
     else if(reply == m_checkSessionReply)
     {
-        m_checkSessionReply = 0;
+        m_checkSessionReply = nullptr;
         if(response.status == "ok")
         {
             qDebug("ScrobblerAuth[%s]: session ok", qPrintable(m_name));
diff --git a/src/plugins/General/scrobbler/scrobbler.h b/src/plugins/General/scrobbler/scrobbler.h
index d87a92778..8efb39098 100644
--- a/src/plugins/General/scrobbler/scrobbler.h
+++ b/src/plugins/General/scrobbler/scrobbler.h
@@ -56,7 +56,7 @@ class Scrobbler : public QObject
 {
     Q_OBJECT
 public:
-    Scrobbler(const QString &scrobblerUrl, const QString &name,QObject *parent = 0);
+    Scrobbler(const QString &scrobblerUrl, const QString &name,QObject *parent = nullptr);
     ~Scrobbler();
 
 private slots:
@@ -93,7 +93,7 @@ class ScrobblerAuth : public QObject
     Q_OBJECT
 public:
     explicit ScrobblerAuth(const QString &scrobblerUrl, const QString &authUrl,
-                           const QString &name, QObject *parent = 0);
+                           const QString &name, QObject *parent = nullptr);
     void getToken();
     void getSession();
     void checkSession(const QString &session);
diff --git a/src/plugins/General/scrobbler/scrobblerhandler.h b/src/plugins/General/scrobbler/scrobblerhandler.h
index b9eb37aa4..9a923bf87 100644
--- a/src/plugins/General/scrobbler/scrobblerhandler.h
+++ b/src/plugins/General/scrobbler/scrobblerhandler.h
@@ -33,7 +33,7 @@ class ScrobblerHandler : public QObject
 Q_OBJECT
 
 public:
-    ScrobblerHandler(QObject *parent = 0);
+    ScrobblerHandler(QObject *parent = nullptr);
     ~ScrobblerHandler();
 };
 
diff --git a/src/plugins/General/scrobbler/settingsdialog.h b/src/plugins/General/scrobbler/settingsdialog.h
index 953bc330f..b82af0029 100644
--- a/src/plugins/General/scrobbler/settingsdialog.h
+++ b/src/plugins/General/scrobbler/settingsdialog.h
@@ -32,7 +32,7 @@ class SettingsDialog : public QDialog
 {
 Q_OBJECT
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
 
     ~SettingsDialog();
 
diff --git a/src/plugins/General/statusicon/coverwidget.h b/src/plugins/General/statusicon/coverwidget.h
index 36888062c..7434b5ea4 100644
--- a/src/plugins/General/statusicon/coverwidget.h
+++ b/src/plugins/General/statusicon/coverwidget.h
@@ -31,7 +31,7 @@ class CoverWidget : public QWidget
 {
 Q_OBJECT
 public:
-    CoverWidget(QWidget *parent = 0);
+    CoverWidget(QWidget *parent = nullptr);
 
     ~CoverWidget();
 
diff --git a/src/plugins/General/statusicon/qmmptrayicon.h b/src/plugins/General/statusicon/qmmptrayicon.h
index 220b59929..190d52a73 100644
--- a/src/plugins/General/statusicon/qmmptrayicon.h
+++ b/src/plugins/General/statusicon/qmmptrayicon.h
@@ -36,7 +36,7 @@ class QmmpTrayIcon : public QSystemTrayIcon
 {
 Q_OBJECT
 public:
-    QmmpTrayIcon(QObject *parent = 0);
+    QmmpTrayIcon(QObject *parent = nullptr);
     ~QmmpTrayIcon();
 
      void setToolTip(const QString &tip);
diff --git a/src/plugins/General/statusicon/settingsdialog.h b/src/plugins/General/statusicon/settingsdialog.h
index afb2f0327..776172129 100644
--- a/src/plugins/General/statusicon/settingsdialog.h
+++ b/src/plugins/General/statusicon/settingsdialog.h
@@ -30,7 +30,7 @@ class SettingsDialog : public QDialog
 {
 Q_OBJECT
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
 
     ~SettingsDialog();
 
diff --git a/src/plugins/General/statusicon/statusicon.h b/src/plugins/General/statusicon/statusicon.h
index f40cbcb5a..6225b977d 100644
--- a/src/plugins/General/statusicon/statusicon.h
+++ b/src/plugins/General/statusicon/statusicon.h
@@ -40,7 +40,7 @@ class StatusIcon : public QObject
 {
 Q_OBJECT
 public:
-    StatusIcon(QObject *parent = 0);
+    StatusIcon(QObject *parent = nullptr);
 
     ~StatusIcon();
 
diff --git a/src/plugins/General/statusicon/statusiconpopupwidget.h b/src/plugins/General/statusicon/statusiconpopupwidget.h
index 7a9aaa7a4..906435933 100644
--- a/src/plugins/General/statusicon/statusiconpopupwidget.h
+++ b/src/plugins/General/statusicon/statusiconpopupwidget.h
@@ -43,7 +43,7 @@ class StatusIconPopupWidget : public QFrame
     Q_OBJECT
 public:
 
-    StatusIconPopupWidget(QWidget * parent = 0);
+    StatusIconPopupWidget(QWidget *parent = nullptr);
     ~StatusIconPopupWidget();
 
     void showInfo(int x, int y, const QString &message); //x,y are tray icon position
@@ -75,7 +75,7 @@ class TimeBar : public QProgressBar
 {
     Q_OBJECT
 public:
-    TimeBar(QWidget *parent = 0);
+    TimeBar(QWidget *parent = nullptr);
     virtual QString text() const;
 };
 
diff --git a/src/plugins/General/streambrowser/editstreamdialog.h b/src/plugins/General/streambrowser/editstreamdialog.h
index a0e24ce3a..4f6ddc500 100644
--- a/src/plugins/General/streambrowser/editstreamdialog.h
+++ b/src/plugins/General/streambrowser/editstreamdialog.h
@@ -33,7 +33,7 @@ class EditStreamDialog : public QDialog
     Q_OBJECT
 
 public:
-    explicit EditStreamDialog(QWidget *parent = 0);
+    explicit EditStreamDialog(QWidget *parent = nullptr);
     ~EditStreamDialog();
 
     enum Key
diff --git a/src/plugins/General/streambrowser/streambrowser.h b/src/plugins/General/streambrowser/streambrowser.h
index 0f23644d8..7ea50e575 100644
--- a/src/plugins/General/streambrowser/streambrowser.h
+++ b/src/plugins/General/streambrowser/streambrowser.h
@@ -35,7 +35,7 @@ class StreamBrowser : public QObject
 {
 Q_OBJECT
 public:
-    StreamBrowser(QObject *parent = 0);
+    StreamBrowser(QObject *parent = nullptr);
 
     ~StreamBrowser();
 
diff --git a/src/plugins/General/streambrowser/streambrowserfactory.cpp b/src/plugins/General/streambrowser/streambrowserfactory.cpp
index 655a7adfb..4b2fc70c3 100644
--- a/src/plugins/General/streambrowser/streambrowserfactory.cpp
+++ b/src/plugins/General/streambrowser/streambrowserfactory.cpp
@@ -42,7 +42,7 @@ QObject *StreamBrowserFactory::create(QObject *parent)
 QDialog *StreamBrowserFactory::createConfigDialog(QWidget *parent)
 {
     Q_UNUSED(parent);
-    return 0;
+    return nullptr;
 }
 
 void StreamBrowserFactory::showAbout(QWidget *parent)
diff --git a/src/plugins/General/streambrowser/streamwindow.cpp b/src/plugins/General/streambrowser/streamwindow.cpp
index 6bf73f6d4..e5dadd958 100644
--- a/src/plugins/General/streambrowser/streamwindow.cpp
+++ b/src/plugins/General/streambrowser/streamwindow.cpp
@@ -47,7 +47,7 @@ StreamWindow::StreamWindow(QWidget *parent)
     setWindowFlags(Qt::Window);
     setAttribute(Qt::WA_DeleteOnClose);
     setAttribute(Qt::WA_QuitOnClose, false);
-    m_requestReply = 0;
+    m_requestReply = nullptr;
     //buttons
     m_ui->addPushButton->setIcon(QIcon::fromTheme("list-add"));
     m_ui->updatePushButton->setIcon(QIcon::fromTheme("view-refresh"));
@@ -153,13 +153,13 @@ void StreamWindow::showText(QNetworkReply *reply)
     {
         m_ui->statusLabel->setText(tr("Error"));
         QMessageBox::warning (this, tr("Error"), reply->errorString());
-        m_requestReply = 0;
+        m_requestReply = nullptr;
         reply->deleteLater();
         return;
     }
     if(m_requestReply == reply)
     {
-        m_requestReply = 0;
+        m_requestReply = nullptr;
         readXml(reply, m_iceCastModel);
     }
     reply->deleteLater();
diff --git a/src/plugins/General/streambrowser/streamwindow.h b/src/plugins/General/streambrowser/streamwindow.h
index c36c54b69..58512c9c1 100644
--- a/src/plugins/General/streambrowser/streamwindow.h
+++ b/src/plugins/General/streambrowser/streamwindow.h
@@ -42,7 +42,7 @@ class StreamWindow : public QWidget
 {
 Q_OBJECT
 public:
-    StreamWindow(QWidget *parent = 0);
+    StreamWindow(QWidget *parent = nullptr);
 
     ~StreamWindow();
 
diff --git a/src/plugins/General/taskbar/taskbarhelper.h b/src/plugins/General/taskbar/taskbarhelper.h
index d139f848f..db4082c12 100644
--- a/src/plugins/General/taskbar/taskbarhelper.h
+++ b/src/plugins/General/taskbar/taskbarhelper.h
@@ -36,7 +36,7 @@ class TaskbarHelper : public QObject
 {

 Q_OBJECT

 public:

-    TaskbarHelper(QObject *parent = 0);

+    TaskbarHelper(QObject *parent = nullptr);

     ~TaskbarHelper();

 

 private slots:

diff --git a/src/plugins/General/trackchange/settingsdialog.h b/src/plugins/General/trackchange/settingsdialog.h
index dfb022577..57b9a350f 100644
--- a/src/plugins/General/trackchange/settingsdialog.h
+++ b/src/plugins/General/trackchange/settingsdialog.h
@@ -33,7 +33,7 @@ class SettingsDialog : public QDialog
 {
     Q_OBJECT
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
 
     ~SettingsDialog();
 
diff --git a/src/plugins/General/trackchange/trackchange.h b/src/plugins/General/trackchange/trackchange.h
index 0ea02ad43..5cfba8e9d 100644
--- a/src/plugins/General/trackchange/trackchange.h
+++ b/src/plugins/General/trackchange/trackchange.h
@@ -36,7 +36,7 @@ class TrackChange : public QObject
 {
     Q_OBJECT
 public:
-    TrackChange(QObject *parent = 0);
+    TrackChange(QObject *parent = nullptr);
 
     ~TrackChange();
 
diff --git a/src/plugins/General/udisks2/settingsdialog.h b/src/plugins/General/udisks2/settingsdialog.h
index 8a6f1cc5b..c8191f380 100644
--- a/src/plugins/General/udisks2/settingsdialog.h
+++ b/src/plugins/General/udisks2/settingsdialog.h
@@ -30,7 +30,7 @@ class SettingsDialog : public QDialog
 {
 Q_OBJECT
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
 
     ~SettingsDialog();
 
diff --git a/src/plugins/General/udisks2/udisks2device.h b/src/plugins/General/udisks2/udisks2device.h
index 8fcca4c6f..4b0e9543c 100644
--- a/src/plugins/General/udisks2/udisks2device.h
+++ b/src/plugins/General/udisks2/udisks2device.h
@@ -65,7 +65,7 @@ class UDisks2Device : public QObject
 {
     Q_OBJECT
 public:
-    UDisks2Device(QDBusObjectPath o, QObject *parent = 0);
+    UDisks2Device(QDBusObjectPath o, QObject *parent = nullptr);
 
     ~UDisks2Device();
 
diff --git a/src/plugins/General/udisks2/udisks2manager.h b/src/plugins/General/udisks2/udisks2manager.h
index cbd1e2fe1..2b4e705fe 100644
--- a/src/plugins/General/udisks2/udisks2manager.h
+++ b/src/plugins/General/udisks2/udisks2manager.h
@@ -37,7 +37,7 @@ class UDisks2Manager : public QObject
 {
 Q_OBJECT
 public:
-    UDisks2Manager(QObject *parent = 0);
+    UDisks2Manager(QObject *parent = nullptr);
 
     ~UDisks2Manager();
 
diff --git a/src/plugins/General/udisks2/udisks2plugin.cpp b/src/plugins/General/udisks2/udisks2plugin.cpp
index 84327f866..fdae8b923 100644
--- a/src/plugins/General/udisks2/udisks2plugin.cpp
+++ b/src/plugins/General/udisks2/udisks2plugin.cpp
@@ -184,7 +184,7 @@ QAction *UDisks2Plugin::findAction(const QString &dev_path)
         if (action->data().toString() == dev_path)
             return action;
     }
-    return 0;
+    return nullptr;
 }
 
 UDisks2Device *UDisks2Plugin::findDevice(QAction *action)
@@ -205,7 +205,7 @@ UDisks2Device *UDisks2Plugin::findDevice(QAction *action)
                 return device;
         }
     }
-    return 0;
+    return nullptr;
 }
 
 void UDisks2Plugin::addPath(const QString &path)
diff --git a/src/plugins/General/udisks2/udisks2plugin.h b/src/plugins/General/udisks2/udisks2plugin.h
index ed3130da0..a5d428220 100644
--- a/src/plugins/General/udisks2/udisks2plugin.h
+++ b/src/plugins/General/udisks2/udisks2plugin.h
@@ -36,7 +36,7 @@ class UDisks2Plugin : public QObject
 {
 Q_OBJECT
 public:
-    UDisks2Plugin(QObject *parent = 0);
+    UDisks2Plugin(QObject *parent = nullptr);
 
     ~UDisks2Plugin();
 
diff --git a/src/plugins/Input/aac/decoder_aac.cpp b/src/plugins/Input/aac/decoder_aac.cpp
index bd6708b6e..6a4c3740c 100644
--- a/src/plugins/Input/aac/decoder_aac.cpp
+++ b/src/plugins/Input/aac/decoder_aac.cpp
@@ -36,10 +36,10 @@ DecoderAAC::DecoderAAC(QIODevice *i)
 {
     m_bitrate = 0;
     m_totalTime = 0;
-    m_data = 0;
-    m_input_buf = 0;
+    m_data = nullptr;
+    m_input_buf = nullptr;
     m_input_at = 0;
-    m_sample_buf = 0;
+    m_sample_buf = nullptr;
     m_sample_buf_at = 0;
     m_sample_buf_size = 0;
 }
@@ -52,11 +52,11 @@ DecoderAAC::~DecoderAAC()
         if (data()->handle)
             NeAACDecClose (data()->handle);
         delete data();
-        m_data = 0;
+        m_data = nullptr;
     }
     if (m_input_buf)
         delete [] m_input_buf;
-    m_input_buf = 0;
+    m_input_buf = nullptr;
     m_bitrate = 0;
 }
 
diff --git a/src/plugins/Input/aac/decoderaacfactory.cpp b/src/plugins/Input/aac/decoderaacfactory.cpp
index eca457612..6ceca28ee 100644
--- a/src/plugins/Input/aac/decoderaacfactory.cpp
+++ b/src/plugins/Input/aac/decoderaacfactory.cpp
@@ -92,7 +92,7 @@ MetaDataModel* DecoderAACFactory::createMetaDataModel(const QString &path, bool
 {
     Q_UNUSED(path);
     Q_UNUSED(readOnly);
-    return 0;
+    return nullptr;
 }
 
 void DecoderAACFactory::showSettings(QWidget *)
diff --git a/src/plugins/Input/archive/archiveinputdevice.cpp b/src/plugins/Input/archive/archiveinputdevice.cpp
index 6056dca98..8d10647ab 100644
--- a/src/plugins/Input/archive/archiveinputdevice.cpp
+++ b/src/plugins/Input/archive/archiveinputdevice.cpp
@@ -23,8 +23,8 @@
 
 ArchiveInputDevice::ArchiveInputDevice(const QString &url, QObject *parent)  : QIODevice(parent)
 {
-    m_archive = 0;
-    m_entry = 0;
+    m_archive = nullptr;
+    m_entry = nullptr;
     QString filePath = url.section("#", -1);
     QString archivePath = url;
     archivePath.remove(QRegExp("^.+://"));
@@ -74,7 +74,7 @@ ArchiveInputDevice::~ArchiveInputDevice()
     {
         archive_read_close(m_archive);
         archive_read_free(m_archive);
-        m_archive = 0;
+        m_archive = nullptr;
     }
 }
 
diff --git a/src/plugins/Input/archive/archiveinputdevice.h b/src/plugins/Input/archive/archiveinputdevice.h
index eab4747eb..e6c31fdda 100644
--- a/src/plugins/Input/archive/archiveinputdevice.h
+++ b/src/plugins/Input/archive/archiveinputdevice.h
@@ -30,8 +30,8 @@ class ArchiveInputDevice : public QIODevice
 {
     Q_OBJECT
 public:
-    ArchiveInputDevice(const QString &url, QObject *parent = 0);
-    ArchiveInputDevice(struct archive *a, struct archive_entry *e, QObject *parent = 0);
+    ArchiveInputDevice(const QString &url, QObject *parent = nullptr);
+    ArchiveInputDevice(struct archive *a, struct archive_entry *e, QObject *parent = nullptr);
     virtual ~ArchiveInputDevice();
 
     bool seek(qint64 pos);
diff --git a/src/plugins/Input/archive/decoder_archive.cpp b/src/plugins/Input/archive/decoder_archive.cpp
index d4cd7933d..fa5bcf292 100644
--- a/src/plugins/Input/archive/decoder_archive.cpp
+++ b/src/plugins/Input/archive/decoder_archive.cpp
@@ -27,8 +27,8 @@
 DecoderArchive::DecoderArchive(const QString &url)
 {
     m_url = url;
-    m_decoder = 0;
-    m_input = 0;
+    m_decoder = nullptr;
+    m_input = nullptr;
 }
 
 DecoderArchive::~DecoderArchive()
@@ -36,12 +36,12 @@ DecoderArchive::~DecoderArchive()
     if(m_decoder)
     {
         delete m_decoder;
-        m_decoder = 0;
+        m_decoder = nullptr;
     }
     if(m_input)
     {
         delete m_input;
-        m_input = 0;
+        m_input = nullptr;
     }
 }
 
@@ -80,7 +80,7 @@ bool DecoderArchive::initialize()
         return false;
     }
 
-    DecoderFactory *factory = 0;
+    DecoderFactory *factory = nullptr;
     if(filtered.size() == 1)
         factory = filtered.first();
     else
diff --git a/src/plugins/Input/archive/decoderarchivefactory.cpp b/src/plugins/Input/archive/decoderarchivefactory.cpp
index 50a994229..2b0f6ce25 100644
--- a/src/plugins/Input/archive/decoderarchivefactory.cpp
+++ b/src/plugins/Input/archive/decoderarchivefactory.cpp
@@ -56,7 +56,7 @@ Decoder *DecoderArchiveFactory::create(const QString &url, QIODevice *)
 QList<TrackInfo *> DecoderArchiveFactory::createPlayList(const QString &path, TrackInfo::Parts parts, QStringList *)
 {
     QList<TrackInfo *> list;
-    struct archive_entry *entry = 0;
+    struct archive_entry *entry = nullptr;
 
     struct archive *a = archive_read_new();
     archive_read_support_filter_all(a);
@@ -109,7 +109,7 @@ QList<TrackInfo *> DecoderArchiveFactory::createPlayList(const QString &path, Tr
                                      .arg(archivePath)
                                      .arg(filePath));
 
-                ArchiveInputDevice dev(a, entry, 0);
+                ArchiveInputDevice dev(a, entry, nullptr);
                 ArchiveTagReader reader(&dev, list.last()->path());
 
                 if(parts & TrackInfo::MetaData)
@@ -140,7 +140,7 @@ MetaDataModel* DecoderArchiveFactory::createMetaDataModel(const QString &path, b
 {
     Q_UNUSED(path);
     Q_UNUSED(readOnly);
-    return 0;
+    return nullptr;
 }
 
 void DecoderArchiveFactory::showSettings(QWidget *)
diff --git a/src/plugins/Input/cdaudio/decoder_cdaudio.cpp b/src/plugins/Input/cdaudio/decoder_cdaudio.cpp
index 1eda15805..11e8119ab 100644
--- a/src/plugins/Input/cdaudio/decoder_cdaudio.cpp
+++ b/src/plugins/Input/cdaudio/decoder_cdaudio.cpp
@@ -87,7 +87,7 @@ DecoderCDAudio::DecoderCDAudio(const QString &url) : Decoder()
     m_last_sector  = -1;
     m_current_sector  = -1;
     m_url = url;
-    m_cdio = 0;
+    m_cdio = nullptr;
     m_buffer_at = 0;
     m_buffer = new char[CDDA_BUFFER_SIZE];
 }
@@ -98,7 +98,7 @@ DecoderCDAudio::~DecoderCDAudio()
     if (m_cdio)
     {
         cdio_destroy(m_cdio);
-        m_cdio = 0;
+        m_cdio = nullptr;
     }
     delete [] m_buffer;
 }
@@ -111,13 +111,13 @@ QList<CDATrack> DecoderCDAudio::generateTrackList(const QString &device, TrackIn
     bool use_cd_text = settings.value("cdaudio/cdtext", true).toBool();
     QList <CDATrack> tracks;
     cdio_log_set_handler(log_handler); //setup cdio log handler
-    CdIo_t *cdio = 0;
+    CdIo_t *cdio = nullptr;
     QString device_path = device;
     if (device_path.isEmpty() || device_path == "/")
         device_path = settings.value("cdaudio/device").toString();
     if (device_path.isEmpty() || device_path == "/")
     {
-        char **cd_drives = cdio_get_devices_with_cap(0, CDIO_FS_AUDIO, true); //get drive list with CDA disks
+        char **cd_drives = cdio_get_devices_with_cap(nullptr, CDIO_FS_AUDIO, true); //get drive list with CDA disks
         // open first audio capable cd drive
         if (cd_drives && *cd_drives)
         {
@@ -164,7 +164,7 @@ QList<CDATrack> DecoderCDAudio::generateTrackList(const QString &device, TrackIn
             qWarning("DecoderCDAudio: unable to set drive speed to %dX.", cd_speed);
     }
 
-    cdrom_drive_t *pcdrom_drive = cdio_cddap_identify_cdio(cdio, 1, 0); //create paranoya CD-ROM object
+    cdrom_drive_t *pcdrom_drive = cdio_cddap_identify_cdio(cdio, 1, nullptr); //create paranoya CD-ROM object
     //get first and last track numbers
     int first_track_number = cdio_get_first_track_num(pcdrom_drive->p_cdio);
     int last_track_number = cdio_get_last_track_num(pcdrom_drive->p_cdio);
@@ -173,7 +173,7 @@ QList<CDATrack> DecoderCDAudio::generateTrackList(const QString &device, TrackIn
     {
         qWarning("DecoderCDAudio: invalid first (last) track number.");
         cdio_destroy(cdio);
-        cdio = 0;
+        cdio = nullptr;
         return tracks;
     }
     bool use_cddb = true;
@@ -201,12 +201,12 @@ QList<CDATrack> DecoderCDAudio::generateTrackList(const QString &device, TrackIn
             qWarning("DecoderCDAudio: invalid stard(end) lsn for the track %d.", i);
             tracks.clear();
             cdio_destroy(cdio);
-            cdio = 0;
+            cdio = nullptr;
             return tracks;
         }
         //cd text
 #if LIBCDIO_VERSION_NUM <= 83
-        cdtext_t *cdtext = use_cd_text ? cdio_get_cdtext(pcdrom_drive->p_cdio, i) : 0;
+        cdtext_t *cdtext = use_cd_text ? cdio_get_cdtext(pcdrom_drive->p_cdio, i) : nullptr;
         if (cdtext && cdtext->field[CDTEXT_TITLE])
         {
             t.info.setValue(Qmmp::TITLE, QString::fromLocal8Bit(cdtext->field[CDTEXT_TITLE]));
@@ -215,7 +215,7 @@ QList<CDATrack> DecoderCDAudio::generateTrackList(const QString &device, TrackIn
             use_cddb = false;
         }
 #else
-        cdtext_t *cdtext = use_cd_text ? cdio_get_cdtext(pcdrom_drive->p_cdio) : 0;
+        cdtext_t *cdtext = use_cd_text ? cdio_get_cdtext(pcdrom_drive->p_cdio) : nullptr;
         if (cdtext)
         {
             t.info.setValue(Qmmp::TITLE, QString::fromUtf8(cdtext_get_const(cdtext,CDTEXT_FIELD_TITLE,i)));
@@ -329,7 +329,7 @@ QList<CDATrack> DecoderCDAudio::generateTrackList(const QString &device, TrackIn
     }
 
     cdio_destroy(cdio);
-    cdio = 0;
+    cdio = nullptr;
     m_track_cache = tracks;
     return tracks;
 }
@@ -425,7 +425,7 @@ bool DecoderCDAudio::initialize()
 
     if (device_path.isEmpty() || device_path == "/")
     {
-        char **cd_drives = cdio_get_devices_with_cap(0, CDIO_FS_AUDIO, true); //get drive list with CDA disks
+        char **cd_drives = cdio_get_devices_with_cap(nullptr, CDIO_FS_AUDIO, true); //get drive list with CDA disks
         // open first audio capable cd drive
         if (cd_drives && *cd_drives)
         {
diff --git a/src/plugins/Input/cdaudio/decodercdaudiofactory.cpp b/src/plugins/Input/cdaudio/decodercdaudiofactory.cpp
index 9fca3c1fe..f79ba96be 100644
--- a/src/plugins/Input/cdaudio/decodercdaudiofactory.cpp
+++ b/src/plugins/Input/cdaudio/decodercdaudiofactory.cpp
@@ -72,7 +72,7 @@ MetaDataModel* DecoderCDAudioFactory::createMetaDataModel(const QString &path, b
 {
     Q_UNUSED(readOnly);
     Q_UNUSED(path);
-    return 0;
+    return nullptr;
 }
 
 void DecoderCDAudioFactory::showSettings(QWidget *parent)
diff --git a/src/plugins/Input/cdaudio/settingsdialog.h b/src/plugins/Input/cdaudio/settingsdialog.h
index 7eb53d5a9..ff784a6db 100644
--- a/src/plugins/Input/cdaudio/settingsdialog.h
+++ b/src/plugins/Input/cdaudio/settingsdialog.h
@@ -30,7 +30,7 @@ class SettingsDialog : public QDialog
 {
 Q_OBJECT
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
 
     ~SettingsDialog();
 
diff --git a/src/plugins/Input/cue/cueparser.cpp b/src/plugins/Input/cue/cueparser.cpp
index 350d6f76e..b50eda92d 100644
--- a/src/plugins/Input/cue/cueparser.cpp
+++ b/src/plugins/Input/cue/cueparser.cpp
@@ -49,9 +49,9 @@ CUEParser::CUEParser(const QString &path)
     QSettings settings(Qmmp::configFile(), QSettings::IniFormat);
     settings.beginGroup("CUE");
     m_dirty = settings.value("dirty_cue", false).toBool();
-    QTextCodec *codec = 0;
+    QTextCodec *codec = nullptr;
 #ifdef WITH_ENCA
-    EncaAnalyser analyser = 0;
+    EncaAnalyser analyser = nullptr;
     if(settings.value("use_enca", false).toBool())
     {
         analyser = enca_analyser_alloc(settings.value("enca_lang").toByteArray ().constData());
diff --git a/src/plugins/Input/cue/decoder_cue.cpp b/src/plugins/Input/cue/decoder_cue.cpp
index e21dfdca5..ae7f06edc 100644
--- a/src/plugins/Input/cue/decoder_cue.cpp
+++ b/src/plugins/Input/cue/decoder_cue.cpp
@@ -33,27 +33,27 @@ DecoderCUE::DecoderCUE(const QString &url)
         : Decoder()
 {
     m_path = url;
-    m_decoder = 0;
-    m_parser = 0;
+    m_decoder = nullptr;
+    m_parser = nullptr;
     m_track = 0;
-    m_buf = 0;
-    m_input = 0;
+    m_buf = nullptr;
+    m_input = nullptr;
 }
 
 DecoderCUE::~DecoderCUE()
 {
     if(m_decoder)
         delete m_decoder;
-    m_decoder = 0;
+    m_decoder = nullptr;
     if(m_parser)
         delete m_parser;
-    m_parser = 0;
+    m_parser = nullptr;
     if(m_buf)
         delete [] m_buf;
-    m_buf = 0;
+    m_buf = nullptr;
     if(m_input)
         m_input->deleteLater();
-    m_input = 0;
+    m_input = nullptr;
 }
 
 bool DecoderCUE::initialize()
@@ -134,7 +134,7 @@ qint64 DecoderCUE::read(unsigned char *data, qint64 size)
         if(size >= m_buf_size)
         {
             delete[] m_buf;
-            m_buf = 0;
+            m_buf = nullptr;
             m_buf_size = 0;
         }
         else
diff --git a/src/plugins/Input/cue/decodercuefactory.cpp b/src/plugins/Input/cue/decodercuefactory.cpp
index 103f4b597..35d66e1dd 100644
--- a/src/plugins/Input/cue/decodercuefactory.cpp
+++ b/src/plugins/Input/cue/decodercuefactory.cpp
@@ -77,7 +77,7 @@ QList<TrackInfo *> DecoderCUEFactory::createPlayList(const QString &path, TrackI
 MetaDataModel* DecoderCUEFactory::createMetaDataModel(const QString &path, bool readOnly)
 {
     Q_UNUSED(readOnly);
-    return path.startsWith("cue://") ? new CUEMetaDataModel(path) : 0;
+    return path.startsWith("cue://") ? new CUEMetaDataModel(path) : nullptr;
 }
 
 void DecoderCUEFactory::showSettings(QWidget *parent)
diff --git a/src/plugins/Input/cue/settingsdialog.h b/src/plugins/Input/cue/settingsdialog.h
index 60bdc6c07..158be59dd 100644
--- a/src/plugins/Input/cue/settingsdialog.h
+++ b/src/plugins/Input/cue/settingsdialog.h
@@ -30,7 +30,7 @@ class SettingsDialog : public QDialog
 {
 Q_OBJECT
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
 
     ~SettingsDialog();
 
diff --git a/src/plugins/Input/ffmpeg/decoder_ffmpeg.cpp b/src/plugins/Input/ffmpeg/decoder_ffmpeg.cpp
index 99ff7c402..9548970fa 100644
--- a/src/plugins/Input/ffmpeg/decoder_ffmpeg.cpp
+++ b/src/plugins/Input/ffmpeg/decoder_ffmpeg.cpp
@@ -71,17 +71,17 @@ DecoderFFmpeg::DecoderFFmpeg(const QString &path, QIODevice *i)
 {
     m_bitrate = 0;
     m_totalTime = 0;
-    ic = 0;
+    ic = nullptr;
     m_path = path;
     m_temp_pkt.size = 0;
     m_pkt.size = 0;
-    m_pkt.data = 0;
+    m_pkt.data = nullptr;
     m_output_at = 0;
     m_skipBytes = 0;
-    m_stream = 0;
-    m_decoded_frame = 0;
+    m_stream = nullptr;
+    m_decoded_frame = nullptr;
     m_channels = 0;
-    c = 0;
+    c = nullptr;
     audioIndex = 0;
     m_seekTime = -1;
     av_init_packet(&m_pkt);
@@ -145,7 +145,7 @@ bool DecoderFFmpeg::initialize()
     qDebug("DecoderFFmpeg: detected format: %s", fmt->long_name);
     qDebug("=%s=", fmt->name);
 
-    m_stream = avio_alloc_context(m_input_buf, INPUT_BUFFER_SIZE, 0, this, ffmpeg_read, NULL, ffmpeg_seek);
+    m_stream = avio_alloc_context(m_input_buf, INPUT_BUFFER_SIZE, 0, this, ffmpeg_read, nullptr, ffmpeg_seek);
     if(!m_stream)
     {
         qWarning("DecoderFFmpeg: unable to initialize I/O callbacks");
@@ -155,37 +155,37 @@ bool DecoderFFmpeg::initialize()
     m_stream->max_packet_size = INPUT_BUFFER_SIZE;
     ic->pb = m_stream;
 
-    if(avformat_open_input(&ic, 0, fmt, 0) != 0)
+    if(avformat_open_input(&ic, nullptr, fmt, nullptr) != 0)
     {
         qDebug("DecoderFFmpeg: avformat_open_input() failed");
         return false;
     }
-    avformat_find_stream_info(ic, 0);
+    avformat_find_stream_info(ic, nullptr);
     if(ic->pb)
         ic->pb->eof_reached = 0;
 
     if (input()->isSequential())
     {
         QMap<Qmmp::MetaData, QString> metaData;
-        AVDictionaryEntry *album = av_dict_get(ic->metadata,"album",0,0);
+        AVDictionaryEntry *album = av_dict_get(ic->metadata,"album",nullptr,0);
         if(!album)
-            album = av_dict_get(ic->metadata,"WM/AlbumTitle",0,0);
-        AVDictionaryEntry *artist = av_dict_get(ic->metadata,"artist",0,0);
+            album = av_dict_get(ic->metadata,"WM/AlbumTitle",nullptr,0);
+        AVDictionaryEntry *artist = av_dict_get(ic->metadata,"artist",nullptr,0);
         if(!artist)
-            artist = av_dict_get(ic->metadata,"author",0,0);
-        AVDictionaryEntry *comment = av_dict_get(ic->metadata,"comment",0,0);
-        AVDictionaryEntry *genre = av_dict_get(ic->metadata,"genre",0,0);
-        AVDictionaryEntry *title = av_dict_get(ic->metadata,"title",0,0);
-        AVDictionaryEntry *year = av_dict_get(ic->metadata,"WM/Year",0,0);
+            artist = av_dict_get(ic->metadata,"author",nullptr,0);
+        AVDictionaryEntry *comment = av_dict_get(ic->metadata,"comment",nullptr,0);
+        AVDictionaryEntry *genre = av_dict_get(ic->metadata,"genre",nullptr,0);
+        AVDictionaryEntry *title = av_dict_get(ic->metadata,"title",nullptr,0);
+        AVDictionaryEntry *year = av_dict_get(ic->metadata,"WM/Year",nullptr,0);
         if(!year)
-            year = av_dict_get(ic->metadata,"year",0,0);
+            year = av_dict_get(ic->metadata,"year",nullptr,0);
         if(!year)
-            year = av_dict_get(ic->metadata,"date",0,0);
-        AVDictionaryEntry *track = av_dict_get(ic->metadata,"track",0,0);
+            year = av_dict_get(ic->metadata,"date",nullptr,0);
+        AVDictionaryEntry *track = av_dict_get(ic->metadata,"track",nullptr,0);
         if(!track)
-            track = av_dict_get(ic->metadata,"WM/Track",0,0);
+            track = av_dict_get(ic->metadata,"WM/Track",nullptr,0);
         if(!track)
-            track = av_dict_get(ic->metadata,"WM/TrackNumber",0,0);
+            track = av_dict_get(ic->metadata,"WM/TrackNumber",nullptr,0);
 
         if(album)
             metaData.insert(Qmmp::ALBUM, QString::fromUtf8(album->value).trimmed());
@@ -209,12 +209,12 @@ bool DecoderFFmpeg::initialize()
     setReplayGainInfo(rg.replayGainInfo());
 
 #if (LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(57,4,0)) //ffmpeg-3.1:  57.48.101
-    c = avcodec_alloc_context3(NULL);
+    c = avcodec_alloc_context3(nullptr);
 #endif
 
     ic->flags |= AVFMT_FLAG_GENPTS;
     av_read_play(ic);
-    audioIndex = av_find_best_stream(ic, AVMEDIA_TYPE_AUDIO, -1, -1, 0, 0);
+    audioIndex = av_find_best_stream(ic, AVMEDIA_TYPE_AUDIO, -1, -1, nullptr, 0);
     if(audioIndex < 0)
     {
         qWarning("DecoderFFmpeg: unable to find audio stream");
@@ -246,7 +246,7 @@ bool DecoderFFmpeg::initialize()
     m_channels = c->request_channels;
 #endif
 
-    av_dump_format(ic,0,0,0);
+    av_dump_format(ic,0,nullptr,0);
 
     AVCodec *codec = avcodec_find_decoder(c->codec_id);
 
@@ -256,7 +256,7 @@ bool DecoderFFmpeg::initialize()
         return false;
     }
 
-    if (avcodec_open2(c, codec, 0) < 0)
+    if (avcodec_open2(c, codec, nullptr) < 0)
     {
         qWarning("DecoderFFmpeg: error while opening codec for output stream");
         return false;
@@ -393,7 +393,7 @@ qint64 DecoderFFmpeg::ffmpeg_decode()
 #endif
 
         if(got_frame)
-            out_size = av_samples_get_buffer_size(0, c->channels, m_decoded_frame->nb_samples,
+            out_size = av_samples_get_buffer_size(nullptr, c->channels, m_decoded_frame->nb_samples,
                                                   c->sample_fmt, 1);
         else
             out_size = 0;
@@ -517,7 +517,7 @@ void DecoderFFmpeg::fillBuffer()
 #else
                     av_free_packet(&m_pkt);
 #endif
-                m_pkt.data = 0;
+                m_pkt.data = nullptr;
                 m_temp_pkt.size = 0;
                 break;
             }
@@ -531,7 +531,7 @@ void DecoderFFmpeg::fillBuffer()
 #else
                 av_free_packet(&m_pkt);
 #endif
-            m_pkt.data = 0;
+            m_pkt.data = nullptr;
             m_temp_pkt.size = 0;
             continue;
         }
diff --git a/src/plugins/Input/ffmpeg/decoderffmpegfactory.cpp b/src/plugins/Input/ffmpeg/decoderffmpegfactory.cpp
index f10186c69..abca4bfb6 100644
--- a/src/plugins/Input/ffmpeg/decoderffmpegfactory.cpp
+++ b/src/plugins/Input/ffmpeg/decoderffmpegfactory.cpp
@@ -165,12 +165,12 @@ QList<TrackInfo *> DecoderFFmpegFactory::createPlayList(const QString &path, Tra
     if(parts == TrackInfo::NoParts)
         return QList<TrackInfo*>() << info;
 
-    AVFormatContext *in = 0;
+    AVFormatContext *in = nullptr;
 
 #ifdef Q_OS_WIN
-    if(avformat_open_input(&in, path.toUtf8().constData(), 0, 0) < 0)
+    if(avformat_open_input(&in, path.toUtf8().constData(), nullptr, nullptr) < 0)
 #else
-    if(avformat_open_input(&in, path.toLocal8Bit().constData(), 0, 0) < 0)
+    if(avformat_open_input(&in, path.toLocal8Bit().constData(), nullptr, nullptr) < 0)
 #endif
     {
         qDebug("DecoderFFmpegFactory: unable to open file");
@@ -178,29 +178,29 @@ QList<TrackInfo *> DecoderFFmpegFactory::createPlayList(const QString &path, Tra
         return  QList<TrackInfo*>();
     }
 
-    avformat_find_stream_info(in, 0);
+    avformat_find_stream_info(in, nullptr);
 
     if(parts & TrackInfo::MetaData)
     {
-        AVDictionaryEntry *album = av_dict_get(in->metadata,"album",0,0);
+        AVDictionaryEntry *album = av_dict_get(in->metadata,"album",nullptr,0);
         if(!album)
-            album = av_dict_get(in->metadata,"WM/AlbumTitle",0,0);
-        AVDictionaryEntry *artist = av_dict_get(in->metadata,"artist",0,0);
+            album = av_dict_get(in->metadata,"WM/AlbumTitle",nullptr,0);
+        AVDictionaryEntry *artist = av_dict_get(in->metadata,"artist",nullptr,0);
         if(!artist)
-            artist = av_dict_get(in->metadata,"author",0,0);
-        AVDictionaryEntry *comment = av_dict_get(in->metadata,"comment",0,0);
-        AVDictionaryEntry *genre = av_dict_get(in->metadata,"genre",0,0);
-        AVDictionaryEntry *title = av_dict_get(in->metadata,"title",0,0);
-        AVDictionaryEntry *year = av_dict_get(in->metadata,"WM/Year",0,0);
+            artist = av_dict_get(in->metadata,"author",nullptr,0);
+        AVDictionaryEntry *comment = av_dict_get(in->metadata,"comment",nullptr,0);
+        AVDictionaryEntry *genre = av_dict_get(in->metadata,"genre",nullptr,0);
+        AVDictionaryEntry *title = av_dict_get(in->metadata,"title",nullptr,0);
+        AVDictionaryEntry *year = av_dict_get(in->metadata,"WM/Year",nullptr,0);
         if(!year)
-            year = av_dict_get(in->metadata,"year",0,0);
+            year = av_dict_get(in->metadata,"year",nullptr,0);
         if(!year)
-            year = av_dict_get(in->metadata,"date",0,0);
-        AVDictionaryEntry *track = av_dict_get(in->metadata,"track",0,0);
+            year = av_dict_get(in->metadata,"date",nullptr,0);
+        AVDictionaryEntry *track = av_dict_get(in->metadata,"track",nullptr,0);
         if(!track)
-            track = av_dict_get(in->metadata,"WM/Track",0,0);
+            track = av_dict_get(in->metadata,"WM/Track",nullptr,0);
         if(!track)
-            track = av_dict_get(in->metadata,"WM/TrackNumber",0,0);
+            track = av_dict_get(in->metadata,"WM/TrackNumber",nullptr,0);
 
         if(album)
             info->setValue(Qmmp::ALBUM, QString::fromUtf8(album->value));
@@ -220,7 +220,7 @@ QList<TrackInfo *> DecoderFFmpegFactory::createPlayList(const QString &path, Tra
 
     if(parts & TrackInfo::Properties)
     {
-        int idx = av_find_best_stream(in, AVMEDIA_TYPE_AUDIO, -1, -1, 0, 0);
+        int idx = av_find_best_stream(in, AVMEDIA_TYPE_AUDIO, -1, -1, nullptr, 0);
         if(idx >= 0)
         {
     #if (LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(57,48,0)) //ffmpeg-3.1:  57.48.101
diff --git a/src/plugins/Input/ffmpeg/ffmpegmetadatamodel.cpp b/src/plugins/Input/ffmpeg/ffmpegmetadatamodel.cpp
index d3b725744..17907d0cd 100644
--- a/src/plugins/Input/ffmpeg/ffmpegmetadatamodel.cpp
+++ b/src/plugins/Input/ffmpeg/ffmpegmetadatamodel.cpp
@@ -23,14 +23,14 @@
 
 FFmpegMetaDataModel::FFmpegMetaDataModel(const QString &path) : MetaDataModel(true)
 {
-    m_in = 0;
+    m_in = nullptr;
 #ifdef Q_OS_WIN
-    if (avformat_open_input(&m_in, path.toUtf8().constData(), 0, 0) < 0)
+    if (avformat_open_input(&m_in, path.toUtf8().constData(), nullptr, nullptr) < 0)
 #else
-    if (avformat_open_input(&m_in, path.toLocal8Bit().constData(), 0, 0) < 0)
+    if (avformat_open_input(&m_in, path.toLocal8Bit().constData(), nullptr, nullptr) < 0)
 #endif
         return;
-    avformat_find_stream_info(m_in, 0);
+    avformat_find_stream_info(m_in, nullptr);
     av_read_play(m_in);
 }
 
@@ -45,9 +45,9 @@ QPixmap FFmpegMetaDataModel::cover() const
     if(!m_in)
         return QPixmap();
 #if (LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(57,48,0)) //ffmpeg-3.1:  57.48.101
-    AVCodecParameters *c = 0;
+    AVCodecParameters *c = nullptr;
 #else
-    AVCodecContext *c = 0;
+    AVCodecContext *c = nullptr;
 #endif
 
     for (uint idx = 0; idx < m_in->nb_streams; idx++)
diff --git a/src/plugins/Input/ffmpeg/replaygainreader.cpp b/src/plugins/Input/ffmpeg/replaygainreader.cpp
index 13c796614..3d4a11d22 100644
--- a/src/plugins/Input/ffmpeg/replaygainreader.cpp
+++ b/src/plugins/Input/ffmpeg/replaygainreader.cpp
@@ -22,7 +22,7 @@
 
 ReplayGainReader::ReplayGainReader(AVFormatContext *ic)
 {
-    AVDictionaryEntry *t = 0;
+    AVDictionaryEntry *t = nullptr;
     while((t = av_dict_get(ic->metadata, "", t, AV_DICT_IGNORE_SUFFIX)))
     {
         if(!strcmp(t->key, "replaygain_album_gain"))
diff --git a/src/plugins/Input/ffmpeg/settingsdialog.h b/src/plugins/Input/ffmpeg/settingsdialog.h
index be1bbf22b..599c3481e 100644
--- a/src/plugins/Input/ffmpeg/settingsdialog.h
+++ b/src/plugins/Input/ffmpeg/settingsdialog.h
@@ -31,7 +31,7 @@ class SettingsDialog : public QDialog
 {
     Q_OBJECT
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
 
     ~SettingsDialog();
 
diff --git a/src/plugins/Input/flac/decoder_flac.cpp b/src/plugins/Input/flac/decoder_flac.cpp
index 29bd4b119..0f2c14df2 100644
--- a/src/plugins/Input/flac/decoder_flac.cpp
+++ b/src/plugins/Input/flac/decoder_flac.cpp
@@ -266,13 +266,13 @@ DecoderFLAC::DecoderFLAC(const QString &path, QIODevice *i)
 {
     m_path = path;
     m_data = new flac_data;
-    m_data->decoder = NULL;
+    m_data->decoder = nullptr;
     m_data->input = i;
-    m_parser = 0;
+    m_parser = nullptr;
     length_in_bytes = 0;
     m_totalBytes = 0;
     m_sz = 0;
-    m_buf = 0;
+    m_buf = nullptr;
     m_offset = 0;
     m_track = 0;
 }
@@ -286,11 +286,11 @@ DecoderFLAC::~DecoderFLAC()
         if (m_data->decoder)
             FLAC__stream_decoder_delete(m_data->decoder);
         delete m_data;
-        m_data = 0;
+        m_data = nullptr;
     }
     if(m_buf)
         delete[] m_buf;
-    m_buf = 0;
+    m_buf = nullptr;
 }
 
 bool DecoderFLAC::initialize()
@@ -506,7 +506,7 @@ qint64 DecoderFLAC::read(unsigned char *buf, qint64 size)
             if(size >= m_buf_size)
             {
                 delete[] m_buf;
-                m_buf = 0;
+                m_buf = nullptr;
                 m_buf_size = 0;
             }
             else
@@ -547,11 +547,11 @@ void DecoderFLAC::deinit()
     {
         m_data->input->close();
         delete m_data->input;
-        m_data->input = 0;
+        m_data->input = nullptr;
     };
     if(m_parser)
         delete m_parser;
-    m_parser = 0;
+    m_parser = nullptr;
 }
 
 const QString DecoderFLAC::nextURL() const
diff --git a/src/plugins/Input/flac/decoderflacfactory.cpp b/src/plugins/Input/flac/decoderflacfactory.cpp
index 02ae1f6bf..28aec227a 100644
--- a/src/plugins/Input/flac/decoderflacfactory.cpp
+++ b/src/plugins/Input/flac/decoderflacfactory.cpp
@@ -91,11 +91,11 @@ QList<TrackInfo*> DecoderFLACFactory::createPlayList(const QString &path, TrackI
     if(parts == TrackInfo::NoParts)
         return QList<TrackInfo *>() << info;
 
-    TagLib::Ogg::XiphComment *tag = 0;
-    TagLib::FLAC::Properties *ap = 0;
+    TagLib::Ogg::XiphComment *tag = nullptr;
+    TagLib::FLAC::Properties *ap = nullptr;
 
-    TagLib::FLAC::File *flacFile = 0;
-    TagLib::Ogg::FLAC::File *oggFlacFile = 0;
+    TagLib::FLAC::File *flacFile = nullptr;
+    TagLib::Ogg::FLAC::File *oggFlacFile = nullptr;
 
     TagLib::FileStream stream(QStringToFileName(path), true);
 
@@ -200,7 +200,7 @@ MetaDataModel* DecoderFLACFactory::createMetaDataModel(const QString &path, bool
     if (!path.contains("://") || path.startsWith("flac://"))
         return new FLACMetaDataModel(path, readOnly);
     else
-        return 0;
+        return nullptr;
 }
 
 void DecoderFLACFactory::showSettings(QWidget *)
diff --git a/src/plugins/Input/flac/flacmetadatamodel.cpp b/src/plugins/Input/flac/flacmetadatamodel.cpp
index ca06512b9..0457d22ef 100644
--- a/src/plugins/Input/flac/flacmetadatamodel.cpp
+++ b/src/plugins/Input/flac/flacmetadatamodel.cpp
@@ -38,9 +38,9 @@ FLACMetaDataModel::FLACMetaDataModel(const QString &path, bool readOnly)
     : MetaDataModel(true)
 #endif
 {
-    m_file = 0;
-    m_stream = 0;
-    m_tag = 0;
+    m_file = nullptr;
+    m_stream = nullptr;
+    m_tag = nullptr;
 
     if(path.startsWith("flac://"))
     {
@@ -81,7 +81,7 @@ FLACMetaDataModel::~FLACMetaDataModel()
     if(m_file)
     {
         delete m_file;
-        m_file = 0;
+        m_file = nullptr;
     }
     if(m_stream)
         delete m_stream;
diff --git a/src/plugins/Input/gme/decoder_gme.cpp b/src/plugins/Input/gme/decoder_gme.cpp
index 3eca96348..4de43f802 100644
--- a/src/plugins/Input/gme/decoder_gme.cpp
+++ b/src/plugins/Input/gme/decoder_gme.cpp
@@ -26,7 +26,7 @@
 DecoderGme::DecoderGme(const QString &path) : Decoder()
 {
     m_path = path;
-    m_emu = 0;
+    m_emu = nullptr;
 }
 
 DecoderGme::~DecoderGme()
@@ -44,7 +44,7 @@ bool DecoderGme::initialize()
     {
         qWarning("DecoderGme: track number is out of range");
         gme_delete(m_emu);
-        m_emu = 0;
+        m_emu = nullptr;
         return false;
     }
     gme_start_track(m_emu, track - 1);
diff --git a/src/plugins/Input/gme/decodergmefactory.cpp b/src/plugins/Input/gme/decodergmefactory.cpp
index cbd7fed44..50fee26a1 100644
--- a/src/plugins/Input/gme/decodergmefactory.cpp
+++ b/src/plugins/Input/gme/decodergmefactory.cpp
@@ -89,7 +89,7 @@ MetaDataModel* DecoderGmeFactory::createMetaDataModel(const QString &path, bool
 {
     Q_UNUSED(path);
     Q_UNUSED(readOnly);
-    return 0;
+    return nullptr;
 }
 
 void DecoderGmeFactory::showSettings(QWidget *parent)
diff --git a/src/plugins/Input/gme/gmehelper.cpp b/src/plugins/Input/gme/gmehelper.cpp
index 04a335701..fad5274f5 100644
--- a/src/plugins/Input/gme/gmehelper.cpp
+++ b/src/plugins/Input/gme/gmehelper.cpp
@@ -25,7 +25,7 @@
 
 GmeHelper::GmeHelper()
 {
-     m_emu = 0;
+     m_emu = nullptr;
 
      QSettings settings(Qmmp::configFile(), QSettings::IniFormat);
      m_fade_length = settings.value("GME/fadeout_length", 7000).toInt();
@@ -37,41 +37,41 @@ GmeHelper::~GmeHelper()
 {
     if(m_emu)
         gme_delete(m_emu);
-    m_emu = 0;
+    m_emu = nullptr;
 }
 
 Music_Emu *GmeHelper::load(const QString &url, int sample_rate)
 {
     if(m_emu)
         gme_delete(m_emu);
-    m_emu = 0;
+    m_emu = nullptr;
     QString path = url;
     if(url.contains("://"))
     {
         path.remove("gme://");
         path.remove(QRegExp("#\\d+$"));
     }
-    const char *err = 0;
+    const char *err = nullptr;
     gme_type_t file_type;
     if((err = gme_identify_file(qPrintable(path),&file_type)))
     {
         qWarning("GmeHelper: %s", err);
-        return 0;
+        return nullptr;
     }
     if(!file_type)
     {
         qWarning("DecoderGme: unsupported music type");
-        return 0;
+        return nullptr;
     }
     if(!(m_emu = gme_new_emu(file_type, sample_rate)))
     {
         qWarning("GmeHelper: out of memory");
-        return 0;
+        return nullptr;
     }
     if((err = gme_load_file(m_emu, qPrintable(path))))
     {
         qWarning("GmeHelper: %s", err);
-        return 0;
+        return nullptr;
     }
     QString m3u_path = path.left(path.lastIndexOf("."));
     m3u_path.append(".m3u");
diff --git a/src/plugins/Input/gme/settingsdialog.h b/src/plugins/Input/gme/settingsdialog.h
index c320153b7..5b4df41da 100644
--- a/src/plugins/Input/gme/settingsdialog.h
+++ b/src/plugins/Input/gme/settingsdialog.h
@@ -32,7 +32,7 @@ class SettingsDialog : public QDialog
     Q_OBJECT
 
 public:
-    explicit SettingsDialog(QWidget *parent = 0);
+    explicit SettingsDialog(QWidget *parent = nullptr);
     ~SettingsDialog();
 
 public slots:
diff --git a/src/plugins/Input/modplug/archivereader.h b/src/plugins/Input/modplug/archivereader.h
index 3357e1142..7a714e385 100644
--- a/src/plugins/Input/modplug/archivereader.h
+++ b/src/plugins/Input/modplug/archivereader.h
@@ -32,7 +32,7 @@ class ArchiveReader : public QObject
 {
 Q_OBJECT
 public:
-    ArchiveReader(QObject *parent = 0);
+    ArchiveReader(QObject *parent = nullptr);
 
     ~ArchiveReader();
 
diff --git a/src/plugins/Input/modplug/decoder_modplug.cpp b/src/plugins/Input/modplug/decoder_modplug.cpp
index 2c386e7ee..a2924c183 100644
--- a/src/plugins/Input/modplug/decoder_modplug.cpp
+++ b/src/plugins/Input/modplug/decoder_modplug.cpp
@@ -39,16 +39,16 @@
 
 // Decoder class
 
-DecoderModPlug* DecoderModPlug::m_instance = 0;
+DecoderModPlug* DecoderModPlug::m_instance = nullptr;
 
-DecoderModPlug::DecoderModPlug(const QString &path) : Decoder(0)
+DecoderModPlug::DecoderModPlug(const QString &path) : Decoder(nullptr)
 {
     m_path = path;
     m_freq = 0;
     m_bitrate = 0;
     m_totalTime = 0;
     m_chan = 0;
-    m_soundFile = 0;
+    m_soundFile = nullptr;
     m_sampleSize = 0;
     m_instance = this;
     m_bps = 0;
@@ -60,7 +60,7 @@ DecoderModPlug::~DecoderModPlug()
 {
     deinit();
     if(m_instance == this)
-        m_instance = 0;
+        m_instance = nullptr;
 }
 
 bool DecoderModPlug::initialize()
@@ -166,7 +166,7 @@ void DecoderModPlug::deinit()
     {
         m_soundFile->Destroy();
         delete m_soundFile;
-        m_soundFile = 0;
+        m_soundFile = nullptr;
     }
     m_input_buf.clear();
 }
diff --git a/src/plugins/Input/modplug/decodermodplugfactory.cpp b/src/plugins/Input/modplug/decodermodplugfactory.cpp
index 1e3174e88..bcba93e9c 100644
--- a/src/plugins/Input/modplug/decodermodplugfactory.cpp
+++ b/src/plugins/Input/modplug/decodermodplugfactory.cpp
@@ -73,7 +73,7 @@ QList<TrackInfo *> DecoderModPlugFactory::createPlayList(const QString &path, Tr
 
     QByteArray buffer;
 
-    ArchiveReader reader(0);
+    ArchiveReader reader(nullptr);
     if (reader.isSupported(path))
     {
         buffer = reader.unpack(path);
diff --git a/src/plugins/Input/modplug/modplugmetadatamodel.cpp b/src/plugins/Input/modplug/modplugmetadatamodel.cpp
index 059901e71..9d4248dd6 100644
--- a/src/plugins/Input/modplug/modplugmetadatamodel.cpp
+++ b/src/plugins/Input/modplug/modplugmetadatamodel.cpp
@@ -31,7 +31,7 @@
 
 ModPlugMetaDataModel::ModPlugMetaDataModel(const QString &path) : MetaDataModel(true)
 {
-    m_soundFile = 0;
+    m_soundFile = nullptr;
     m_path = path;
     ArchiveReader reader(nullptr);
     if(reader.isSupported(m_path))
diff --git a/src/plugins/Input/modplug/settingsdialog.h b/src/plugins/Input/modplug/settingsdialog.h
index e154aaa32..bbd73129f 100644
--- a/src/plugins/Input/modplug/settingsdialog.h
+++ b/src/plugins/Input/modplug/settingsdialog.h
@@ -32,7 +32,7 @@ class SettingsDialog : public QDialog
 {
 Q_OBJECT
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
 
     ~SettingsDialog();
 
diff --git a/src/plugins/Input/mpc/decoder_mpc.cpp b/src/plugins/Input/mpc/decoder_mpc.cpp
index 3df2165b3..714ed0d89 100644
--- a/src/plugins/Input/mpc/decoder_mpc.cpp
+++ b/src/plugins/Input/mpc/decoder_mpc.cpp
@@ -66,7 +66,7 @@ DecoderMPC::DecoderMPC(QIODevice *i)
     m_len = 0;
     m_bitrate = 0;
     m_totalTime = 0.0;
-    m_data = 0;
+    m_data = nullptr;
 }
 
 DecoderMPC::~DecoderMPC()
@@ -77,7 +77,7 @@ DecoderMPC::~DecoderMPC()
         if(m_data->demuxer)
             mpc_demux_exit(m_data->demuxer);
         delete m_data;
-        m_data = 0;
+        m_data = nullptr;
     }
 }
 
diff --git a/src/plugins/Input/mpc/mpcmetadatamodel.cpp b/src/plugins/Input/mpc/mpcmetadatamodel.cpp
index fd7b56481..3326bba6e 100644
--- a/src/plugins/Input/mpc/mpcmetadatamodel.cpp
+++ b/src/plugins/Input/mpc/mpcmetadatamodel.cpp
@@ -174,7 +174,7 @@ void MPCFileTagModel::setValue(Qmmp::MetaData key, const QString &value)
 
 bool MPCFileTagModel::exists() const
 {
-    return (m_tag != 0);
+    return (m_tag != nullptr);
 }
 
 void MPCFileTagModel::create()
@@ -189,7 +189,7 @@ void MPCFileTagModel::create()
 
 void MPCFileTagModel::remove()
 {
-    m_tag = 0;
+    m_tag = nullptr;
 }
 
 void MPCFileTagModel::save()
diff --git a/src/plugins/Input/mpeg/decoder_mad.cpp b/src/plugins/Input/mpeg/decoder_mad.cpp
index d7625fc70..4e984db58 100644
--- a/src/plugins/Input/mpeg/decoder_mad.cpp
+++ b/src/plugins/Input/mpeg/decoder_mad.cpp
@@ -41,7 +41,7 @@ DecoderMAD::DecoderMAD(QIODevice *i) : Decoder(i)
     m_bitrate = 0;
     m_freq = 0;
     m_len = 0;
-    m_input_buf = 0;
+    m_input_buf = nullptr;
     m_input_bytes = 0;
     m_skip_frames = 0;
     m_eof = false;
@@ -56,7 +56,7 @@ DecoderMAD::~DecoderMAD()
     {
         qDebug("DecoderMAD: deleting input_buf");
         delete [] m_input_buf;
-        m_input_buf = 0;
+        m_input_buf = nullptr;
     }
 }
 
@@ -98,7 +98,7 @@ bool DecoderMAD::initialize()
     mad_stream_buffer(&m_stream, (unsigned char *) m_input_buf, m_input_bytes);
     m_stream.error = MAD_ERROR_BUFLEN;
     mad_frame_mute (&m_frame);
-    m_stream.next_frame = 0;
+    m_stream.next_frame = nullptr;
     m_stream.sync = 0;
     ChannelMap map;
     if(m_channels == 1)
@@ -131,7 +131,7 @@ void DecoderMAD::deinit()
     if(m_xing.lame)
     {
         delete m_xing.lame;
-        m_xing.lame = 0;
+        m_xing.lame = nullptr;
     }
 }
 
@@ -204,17 +204,17 @@ bool DecoderMAD::findXingHeader(struct mad_bitptr ptr, unsigned int bitlen)
 DecoderMAD::LameHeader* DecoderMAD::findLameHeader(mad_bitptr ptr, unsigned int bitlen)
 {
     if(bitlen < 272)
-        return 0;
+        return nullptr;
 
     if(mad_bit_read (&ptr, 32) != LAME_MAGIC)
-        return 0;
+        return nullptr;
 
     LameHeader header;
     mad_bit_skip (&ptr, 40); //version
 
     header.revision = mad_bit_read (&ptr, 4);
     if (header.revision == 15)
-        return 0;
+        return nullptr;
 
     mad_bit_skip(&ptr, 12); //VBR,Lowpass filter value
     header.peak = mad_bit_read(&ptr, 32) << 5; //Peak amplitude
@@ -428,7 +428,7 @@ void DecoderMAD::seek(qint64 pos)
         m_stream.error = MAD_ERROR_BUFLEN;
         m_stream.sync = 0;
         m_input_bytes = 0;
-        m_stream.next_frame = 0;
+        m_stream.next_frame = nullptr;
         m_skip_frames = 2;
         m_skip_bytes = 0;
         m_play_bytes = -1;
diff --git a/src/plugins/Input/mpeg/decoder_mad.h b/src/plugins/Input/mpeg/decoder_mad.h
index 9768213a1..8980f1768 100644
--- a/src/plugins/Input/mpeg/decoder_mad.h
+++ b/src/plugins/Input/mpeg/decoder_mad.h
@@ -89,7 +89,7 @@ private:
             frames = 0;
             bytes = 0;
             scale = 0;
-            lame = 0;
+            lame = nullptr;
         }
     };
     XingHeader m_xing;
diff --git a/src/plugins/Input/mpeg/decoder_mpg123.cpp b/src/plugins/Input/mpeg/decoder_mpg123.cpp
index 8c6c0cf27..9a1a5f18b 100644
--- a/src/plugins/Input/mpeg/decoder_mpg123.cpp
+++ b/src/plugins/Input/mpeg/decoder_mpg123.cpp
@@ -66,14 +66,14 @@ DecoderMPG123::DecoderMPG123(QIODevice *i) : Decoder(i)
     m_rate = 0;
     m_frame_info.bitrate = 0;
     m_mpg123_encoding = MPG123_ENC_SIGNED_16;
-    m_handle = 0;
+    m_handle = nullptr;
     m_errors = 0;
 }
 
 DecoderMPG123::~DecoderMPG123()
 {
     cleanup(m_handle);
-    m_handle = 0;
+    m_handle = nullptr;
 }
 
 bool DecoderMPG123::initialize()
@@ -94,7 +94,7 @@ bool DecoderMPG123::initialize()
     }
     int channels = 0;
 
-    if(!(m_handle = mpg123_new(0, &err)))
+    if(!(m_handle = mpg123_new(nullptr, &err)))
     {
         qWarning("DecoderMPG123: basic setup goes wrong: %s", mpg123_plain_strerror(err));
         return false;
@@ -102,11 +102,11 @@ bool DecoderMPG123::initialize()
 
     mpg123_param (m_handle, MPG123_ADD_FLAGS, MPG123_SEEKBUFFER | MPG123_FUZZY, 0);
 
-    if((err = mpg123_replace_reader_handle(m_handle, mpg123_read_cb, mpg123_seek_cb, 0)) != MPG123_OK)
+    if((err = mpg123_replace_reader_handle(m_handle, mpg123_read_cb, mpg123_seek_cb, nullptr)) != MPG123_OK)
     {
         qWarning("DecoderMPG123: mpg123 error: %s", mpg123_plain_strerror(err));
         cleanup(m_handle);
-        m_handle = 0;
+        m_handle = nullptr;
         return false;
     }
     setMPG123Format(MPG123_ENC_FLOAT_32);
@@ -115,7 +115,7 @@ bool DecoderMPG123::initialize()
     {
         qWarning("DecoderMPG123: mpg123 error: %s", mpg123_plain_strerror(err));
         cleanup(m_handle);
-        m_handle = 0;
+        m_handle = nullptr;
         return false;
     }
 
@@ -123,7 +123,7 @@ bool DecoderMPG123::initialize()
     {
         qWarning("DecoderMPG123: mpg123 error: %s", mpg123_plain_strerror(err));
         cleanup(m_handle);
-        m_handle = 0;
+        m_handle = nullptr;
         return false;
     }
     //check format
@@ -131,7 +131,7 @@ bool DecoderMPG123::initialize()
     {
         cleanup(m_handle);
         qWarning("DecoderMPG123: bad encoding: 0x%x!\n", m_mpg123_encoding);
-        m_handle = 0;
+        m_handle = nullptr;
         return false;
     }
 
diff --git a/src/plugins/Input/mpeg/decodermpegfactory.cpp b/src/plugins/Input/mpeg/decodermpegfactory.cpp
index 0c1356262..a251fc750 100644
--- a/src/plugins/Input/mpeg/decodermpegfactory.cpp
+++ b/src/plugins/Input/mpeg/decodermpegfactory.cpp
@@ -136,7 +136,7 @@ bool DecoderMPEGFactory::canDecode(QIODevice *input) const
     if (decoderName != "mpg123")
     {
         mpg123_init();
-        mpg123_handle *handle = mpg123_new(0, 0);
+        mpg123_handle *handle = mpg123_new(nullptr, nullptr);
         if (!handle)
             return false;
         if(mpg123_open_feed(handle) != MPG123_OK)
@@ -151,7 +151,7 @@ bool DecoderMPEGFactory::canDecode(QIODevice *input) const
             return false;
         }
         size_t out_size = 0;
-        int ret = mpg123_decode(handle, (unsigned char*) buf, dataSize, 0, 0, &out_size);
+        int ret = mpg123_decode(handle, (unsigned char*) buf, dataSize, nullptr, 0, &out_size);
         mpg123_close(handle);
         mpg123_delete(handle);
         return ret == MPG123_DONE || ret == MPG123_NEW_FORMAT;
@@ -175,7 +175,7 @@ DecoderProperties DecoderMPEGFactory::properties() const
 
 Decoder *DecoderMPEGFactory::create(const QString &, QIODevice *input)
 {
-    Decoder *d = 0;
+    Decoder *d = nullptr;
 #if defined(WITH_MAD) && defined(WITH_MPG123)
     QSettings settings(Qmmp::configFile(), QSettings::IniFormat);
     if(settings.value("MPEG/decoder", "mad").toString() == "mpg123")
@@ -203,7 +203,7 @@ QList<TrackInfo *> DecoderMPEGFactory::createPlayList(const QString &path, Track
     if(parts == TrackInfo::NoParts)
         return QList<TrackInfo*>() << info;
 
-    TagLib::Tag *tag = 0;
+    TagLib::Tag *tag = nullptr;
     TagLib::FileStream stream(QStringToFileName(path), true);
     TagLib::MPEG::File fileRef(&stream, TagLib::ID3v2::FrameFactory::instance());
 
@@ -212,7 +212,7 @@ QList<TrackInfo *> DecoderMPEGFactory::createPlayList(const QString &path, Track
         QSettings settings(Qmmp::configFile(), QSettings::IniFormat);
         settings.beginGroup("MPEG");
 
-        QTextCodec *codec = 0;
+        QTextCodec *codec = nullptr;
 
         uint tag_array[3];
         tag_array[0] = settings.value("tag_1", SettingsDialog::ID3v2).toInt();
@@ -324,7 +324,7 @@ QList<TrackInfo *> DecoderMPEGFactory::createPlayList(const QString &path, Track
         if(fileRef.ID3v2Tag() && !fileRef.ID3v2Tag()->isEmpty())
         {
             TagLib::ID3v2::Tag *tag = fileRef.ID3v2Tag();
-            TagLib::ID3v2::UserTextIdentificationFrame* frame = 0;
+            TagLib::ID3v2::UserTextIdentificationFrame *frame = nullptr;
             TagLib::ID3v2::FrameList frames = tag->frameList("TXXX");
             for(TagLib::ID3v2::FrameList::Iterator it = frames.begin(); it != frames.end(); ++it)
             {
diff --git a/src/plugins/Input/mpeg/mpegmetadatamodel.cpp b/src/plugins/Input/mpeg/mpegmetadatamodel.cpp
index d4760ea88..a960a15a3 100644
--- a/src/plugins/Input/mpeg/mpegmetadatamodel.cpp
+++ b/src/plugins/Input/mpeg/mpegmetadatamodel.cpp
@@ -380,7 +380,7 @@ void MpegFileTagModel::setValue(Qmmp::MetaData key, const QString &value)
 
 bool MpegFileTagModel::exists() const
 {
-    return (m_tag != 0);
+    return (m_tag != nullptr);
 }
 
 void MpegFileTagModel::create()
@@ -397,7 +397,7 @@ void MpegFileTagModel::create()
 
 void MpegFileTagModel::remove()
 {
-    m_tag = 0;
+    m_tag = nullptr;
 }
 
 void MpegFileTagModel::save()
diff --git a/src/plugins/Input/mpeg/settingsdialog.h b/src/plugins/Input/mpeg/settingsdialog.h
index cdebaa15a..1a08d76f3 100644
--- a/src/plugins/Input/mpeg/settingsdialog.h
+++ b/src/plugins/Input/mpeg/settingsdialog.h
@@ -30,7 +30,7 @@ class SettingsDialog : public QDialog
 {
 Q_OBJECT
 public:
-    SettingsDialog(bool using_rusxmms, QWidget *parent = 0);
+    SettingsDialog(bool using_rusxmms, QWidget *parent = nullptr);
 
     ~SettingsDialog();
 
diff --git a/src/plugins/Input/mpeg/tagextractor.cpp b/src/plugins/Input/mpeg/tagextractor.cpp
index 1e1557947..948b57f67 100644
--- a/src/plugins/Input/mpeg/tagextractor.cpp
+++ b/src/plugins/Input/mpeg/tagextractor.cpp
@@ -59,7 +59,7 @@ const QMap<Qmmp::MetaData, QString> TagExtractor::id3v2tag()
     settings.beginGroup("MPEG");
     QByteArray name = settings.value("ID3v2_encoding","UTF-8").toByteArray ();
     bool utf = false;
-    QTextCodec *codec = 0;
+    QTextCodec *codec = nullptr;
     if (name.contains("UTF"))
     {
         codec = QTextCodec::codecForName ("UTF-8");
diff --git a/src/plugins/Input/opus/decoder_opus.cpp b/src/plugins/Input/opus/decoder_opus.cpp
index 1c68f7e55..92852afef 100644
--- a/src/plugins/Input/opus/decoder_opus.cpp
+++ b/src/plugins/Input/opus/decoder_opus.cpp
@@ -67,7 +67,7 @@ static opus_int64  opustell(void *src)
 DecoderOpus::DecoderOpus(const QString &url, QIODevice *i) : Decoder(i)
 {
     m_totalTime = 0;
-    m_opusfile = 0;
+    m_opusfile = nullptr;
     m_chan = 0;
     m_bitrate = 0;
     m_url = url;
@@ -77,7 +77,7 @@ DecoderOpus::~DecoderOpus()
 {
     if (m_opusfile)
         op_free(m_opusfile);
-    m_opusfile = 0;
+    m_opusfile = nullptr;
 }
 
 bool DecoderOpus::initialize()
@@ -97,9 +97,9 @@ bool DecoderOpus::initialize()
         opusread,
         opusseek,
         opustell,
-        0,
+        nullptr,
     };
-    m_opusfile = op_open_callbacks(this, &opuscb, 0, 0, 0);
+    m_opusfile = op_open_callbacks(this, &opuscb, nullptr, 0, nullptr);
 
     if (!m_opusfile)
     {
@@ -150,7 +150,7 @@ void DecoderOpus::seek(qint64 time)
 
 qint64 DecoderOpus::read(unsigned char *data, qint64 maxSize)
 {
-    int frames = op_read_float(m_opusfile, (float*) data, maxSize / sizeof(float), 0);
+    int frames = op_read_float(m_opusfile, (float*) data, maxSize / sizeof(float), nullptr);
     m_bitrate = op_bitrate_instant(m_opusfile) / 1000;
     return frames * m_chan * sizeof(float);
 }
diff --git a/src/plugins/Input/sid/decoder_sid.cpp b/src/plugins/Input/sid/decoder_sid.cpp
index 6fa67f577..889c762d3 100644
--- a/src/plugins/Input/sid/decoder_sid.cpp
+++ b/src/plugins/Input/sid/decoder_sid.cpp
@@ -32,7 +32,7 @@
 #include "decoder_sid.h"
 
 // Decoder class
-DecoderSID::DecoderSID(SidDatabase *db, const QString &url) : Decoder(), m_tune(0)
+DecoderSID::DecoderSID(SidDatabase *db, const QString &url) : Decoder(), m_tune(nullptr)
 {
     m_db = db;
     m_url = url;
@@ -102,7 +102,7 @@ bool DecoderSID::initialize()
 
     qDebug("DecoderSID: song length: %d", m_length);
 
-    sidbuilder *rs = 0;
+    sidbuilder *rs = nullptr;
     if(settings.value("engine", "residfp").toString() == "residfp")
     {
         rs = new ReSIDfpBuilder("ReSIDfp builder");
diff --git a/src/plugins/Input/sid/decodersidfactory.cpp b/src/plugins/Input/sid/decodersidfactory.cpp
index fa54057d8..c30c7ff6b 100644
--- a/src/plugins/Input/sid/decodersidfactory.cpp
+++ b/src/plugins/Input/sid/decodersidfactory.cpp
@@ -100,7 +100,7 @@ MetaDataModel* DecoderSIDFactory::createMetaDataModel(const QString &path, bool
 {
     Q_UNUSED(path);
     Q_UNUSED(readOnly);
-    return 0;
+    return nullptr;
 }
 
 void DecoderSIDFactory::showSettings(QWidget *parent)
diff --git a/src/plugins/Input/sid/settingsdialog.h b/src/plugins/Input/sid/settingsdialog.h
index 8bbdf3fec..01f784692 100644
--- a/src/plugins/Input/sid/settingsdialog.h
+++ b/src/plugins/Input/sid/settingsdialog.h
@@ -31,7 +31,7 @@ class SettingsDialog : public QDialog
 {
     Q_OBJECT
 public:
-    SettingsDialog(SidDatabase *db, QWidget *parent = 0);
+    SettingsDialog(SidDatabase *db, QWidget *parent = nullptr);
 
     virtual ~SettingsDialog();
 
diff --git a/src/plugins/Input/sid/sidhelper.cpp b/src/plugins/Input/sid/sidhelper.cpp
index 999edcbcf..9700b671f 100644
--- a/src/plugins/Input/sid/sidhelper.cpp
+++ b/src/plugins/Input/sid/sidhelper.cpp
@@ -24,7 +24,7 @@
 
 SIDHelper::SIDHelper(SidDatabase *db)
 {
-    m_tune = 0;
+    m_tune = nullptr;
     m_db = db;
 }
 
@@ -32,7 +32,7 @@ SIDHelper::~SIDHelper()
 {
     if(m_tune)
         delete m_tune;
-    m_tune = 0;
+    m_tune = nullptr;
 }
 
 SidTune *SIDHelper::load(const QString &url)
@@ -40,7 +40,7 @@ SidTune *SIDHelper::load(const QString &url)
     if(m_tune)
     {
         delete m_tune;
-        m_tune = 0;
+        m_tune = nullptr;
     }
     QString path = url;
     int track = 1;
diff --git a/src/plugins/Input/sndfile/decoder_sndfile.cpp b/src/plugins/Input/sndfile/decoder_sndfile.cpp
index d90859454..45607cb24 100644
--- a/src/plugins/Input/sndfile/decoder_sndfile.cpp
+++ b/src/plugins/Input/sndfile/decoder_sndfile.cpp
@@ -79,7 +79,7 @@ DecoderSndFile::DecoderSndFile(QIODevice *input) : Decoder(input)
     //m_path = input;
     m_bitrate = 0;
     m_totalTime = 0;
-    m_sndfile = 0;
+    m_sndfile = nullptr;
     m_freq = 0;
 }
 
@@ -118,7 +118,7 @@ bool DecoderSndFile::initialize()
     m_bitrate =  input()->size () * 8.0 / m_totalTime + 0.5;
 
     if((snd_info.format & SF_FORMAT_SUBMASK) == SF_FORMAT_FLOAT)
-        sf_command (m_sndfile, SFC_SET_SCALE_FLOAT_INT_READ, NULL, SF_TRUE);
+        sf_command (m_sndfile, SFC_SET_SCALE_FLOAT_INT_READ, nullptr, SF_TRUE);
 
     configure(m_freq, chan, Qmmp::PCM_S16LE);
     qDebug("DecoderSndFile: detected format: %08X", snd_info.format);
@@ -133,7 +133,7 @@ void DecoderSndFile::deinit()
     m_freq = 0;
     if (m_sndfile)
         sf_close(m_sndfile);
-    m_sndfile = 0;
+    m_sndfile = nullptr;
 }
 
 qint64 DecoderSndFile::totalTime() const
diff --git a/src/plugins/Input/sndfile/decodersndfilefactory.cpp b/src/plugins/Input/sndfile/decodersndfilefactory.cpp
index f786e091a..23084bb63 100644
--- a/src/plugins/Input/sndfile/decodersndfilefactory.cpp
+++ b/src/plugins/Input/sndfile/decodersndfilefactory.cpp
@@ -141,7 +141,7 @@ QList<TrackInfo *> DecoderSndFileFactory::createPlayList(const QString &path, Tr
         return QList<TrackInfo*>() << info;
 
     SF_INFO snd_info;
-    SNDFILE *sndfile = 0;
+    SNDFILE *sndfile = nullptr;
     memset(&snd_info, 0, sizeof(snd_info));
     snd_info.format = 0;
 #ifdef Q_OS_WIN
@@ -201,7 +201,7 @@ QList<TrackInfo *> DecoderSndFileFactory::createPlayList(const QString &path, Tr
         SF_FORMAT_INFO format_info;
         memset(&format_info, 0, sizeof(format_info));
         format_info.format = (snd_info.format & SF_FORMAT_TYPEMASK);
-        sf_command(0, SFC_GET_FORMAT_INFO, &format_info, sizeof(format_info));
+        sf_command(nullptr, SFC_GET_FORMAT_INFO, &format_info, sizeof(format_info));
         info->setValue(Qmmp::FORMAT_NAME, QString::fromLatin1(format_info.name));
         info->setDuration(int(snd_info.frames * 1000 / snd_info.samplerate));
     }
@@ -212,7 +212,7 @@ QList<TrackInfo *> DecoderSndFileFactory::createPlayList(const QString &path, Tr
 
 MetaDataModel* DecoderSndFileFactory::createMetaDataModel(const QString&, bool)
 {
-    return 0;
+    return nullptr;
 }
 
 void DecoderSndFileFactory::showSettings(QWidget *)
@@ -221,7 +221,7 @@ void DecoderSndFileFactory::showSettings(QWidget *)
 void DecoderSndFileFactory::showAbout(QWidget *parent)
 {
     char version [128] = { 0 };
-    sf_command (NULL, SFC_GET_LIB_VERSION, version, sizeof (version)) ;
+    sf_command (nullptr, SFC_GET_LIB_VERSION, version, sizeof (version)) ;
     QMessageBox::about (parent, tr("About Sndfile Audio Plugin"),
                         tr("Qmmp Sndfile Audio Plugin")+"\n"+
                         tr("Compiled against")+" "+QString(version)+"\n" +
diff --git a/src/plugins/Input/vorbis/decoder_vorbis.cpp b/src/plugins/Input/vorbis/decoder_vorbis.cpp
index 063398500..37f795192 100644
--- a/src/plugins/Input/vorbis/decoder_vorbis.cpp
+++ b/src/plugins/Input/vorbis/decoder_vorbis.cpp
@@ -103,7 +103,7 @@ bool DecoderVorbis::initialize()
         oggclose,
         oggtell
     };
-    if (ov_open_callbacks(this, &oggfile, NULL, 0, oggcb) < 0)
+    if (ov_open_callbacks(this, &oggfile, nullptr, 0, oggcb) < 0)
     {
         qWarning("DecoderVorbis: cannot open stream");
 
@@ -285,7 +285,7 @@ void DecoderVorbis::seek(qint64 time)
 qint64 DecoderVorbis::read(unsigned char *data, qint64 maxSize)
 {
     len = -1;
-    float **pcm = 0;
+    float **pcm = nullptr;
     int section = 0;
     while (len < 0)
         len = ov_read_float(&oggfile, &pcm, maxSize/sizeof(float), &section);
diff --git a/src/plugins/Input/wavpack/decoder_wavpack.cpp b/src/plugins/Input/wavpack/decoder_wavpack.cpp
index e97e1b95b..5ca7a1c50 100644
--- a/src/plugins/Input/wavpack/decoder_wavpack.cpp
+++ b/src/plugins/Input/wavpack/decoder_wavpack.cpp
@@ -38,9 +38,9 @@ DecoderWavPack::DecoderWavPack(const QString &path)
     m_path = path;
     m_totalTime = 0.0;
     m_chan = 0;
-    m_context = 0;
-    m_parser = 0;
-    m_output_buf = 0;
+    m_context = nullptr;
+    m_parser = nullptr;
+    m_output_buf = nullptr;
     m_length_in_bytes = 0;
     m_totalBytes = 0;
     m_frame_size = 0;
@@ -54,7 +54,7 @@ DecoderWavPack::~DecoderWavPack()
     deinit();
     if (m_output_buf)
         delete [] m_output_buf;
-    m_output_buf = 0;
+    m_output_buf = nullptr;
 }
 
 bool DecoderWavPack::initialize()
@@ -79,7 +79,7 @@ bool DecoderWavPack::initialize()
             qWarning("DecoderWavPack: error: %s", err);
             return false;
         }
-        int cue_len = WavpackGetTagItem (m_context, "cuesheet", NULL, 0);
+        int cue_len = WavpackGetTagItem (m_context, "cuesheet", nullptr, 0);
         char *value;
         if (cue_len)
         {
@@ -173,10 +173,10 @@ void DecoderWavPack::deinit()
     m_chan = 0;
     if (m_context)
         WavpackCloseFile (m_context);
-    m_context = 0;
+    m_context = nullptr;
     if(m_parser)
         delete m_parser;
-    m_parser = 0;
+    m_parser = nullptr;
 }
 
 void DecoderWavPack::seek(qint64 time)
diff --git a/src/plugins/Input/wavpack/decoderwavpackfactory.cpp b/src/plugins/Input/wavpack/decoderwavpackfactory.cpp
index f63ccc54d..139fe7494 100644
--- a/src/plugins/Input/wavpack/decoderwavpackfactory.cpp
+++ b/src/plugins/Input/wavpack/decoderwavpackfactory.cpp
@@ -96,7 +96,7 @@ QList<TrackInfo *> DecoderWavPackFactory::createPlayList(const QString &path, Tr
 
     if(parts & TrackInfo::MetaData)
     {
-        cue_len = WavpackGetTagItem (ctx, "cuesheet", NULL, 0);
+        cue_len = WavpackGetTagItem (ctx, "cuesheet", nullptr, 0);
         if (cue_len)
         {
             delete info;
@@ -165,7 +165,7 @@ MetaDataModel* DecoderWavPackFactory::createMetaDataModel(const QString &path, b
     if (!path.contains("://") || path.startsWith("wvpack://"))
         return new WavPackMetaDataModel(path, readOnly);
     else
-        return 0;
+        return nullptr;
 }
 
 void DecoderWavPackFactory::showSettings(QWidget *)
diff --git a/src/plugins/Input/wildmidi/decoder_wildmidi.cpp b/src/plugins/Input/wildmidi/decoder_wildmidi.cpp
index 198175d4c..f3c2e459c 100644
--- a/src/plugins/Input/wildmidi/decoder_wildmidi.cpp
+++ b/src/plugins/Input/wildmidi/decoder_wildmidi.cpp
@@ -26,7 +26,7 @@
 DecoderWildMidi::DecoderWildMidi(const QString &path) : Decoder()
 {
     m_path = path;
-    midi_ptr =  0;
+    midi_ptr = nullptr;
     m_sample_rate = 0;
 }
 
diff --git a/src/plugins/Input/wildmidi/decoderwildmidifactory.cpp b/src/plugins/Input/wildmidi/decoderwildmidifactory.cpp
index c57d14c49..540846af5 100644
--- a/src/plugins/Input/wildmidi/decoderwildmidifactory.cpp
+++ b/src/plugins/Input/wildmidi/decoderwildmidifactory.cpp
@@ -92,7 +92,7 @@ MetaDataModel* DecoderWildMidiFactory::createMetaDataModel(const QString &path,
 {
     Q_UNUSED(path);
     Q_UNUSED(readOnly);
-    return 0;
+    return nullptr;
 }
 
 void DecoderWildMidiFactory::showSettings(QWidget *parent)
diff --git a/src/plugins/Input/wildmidi/settingsdialog.h b/src/plugins/Input/wildmidi/settingsdialog.h
index 2b706f1f3..d190ebe7d 100644
--- a/src/plugins/Input/wildmidi/settingsdialog.h
+++ b/src/plugins/Input/wildmidi/settingsdialog.h
@@ -31,7 +31,7 @@ class SettingsDialog : public QDialog
 {
     Q_OBJECT
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
 
     ~SettingsDialog();
 
diff --git a/src/plugins/Input/wildmidi/wildmidihelper.cpp b/src/plugins/Input/wildmidi/wildmidihelper.cpp
index 612e544f7..812930561 100644
--- a/src/plugins/Input/wildmidi/wildmidihelper.cpp
+++ b/src/plugins/Input/wildmidi/wildmidihelper.cpp
@@ -26,7 +26,7 @@ extern "C"{
 #include <qmmp/qmmp.h>
 #include "wildmidihelper.h"
 
-WildMidiHelper *WildMidiHelper::m_instance = 0;
+WildMidiHelper *WildMidiHelper::m_instance = nullptr;
 
 WildMidiHelper::WildMidiHelper(QObject *parent) :
     QObject(parent)
@@ -40,7 +40,7 @@ WildMidiHelper::~WildMidiHelper()
 {
     if(m_inited)
         WildMidi_Shutdown();
-    m_instance = 0;
+    m_instance = nullptr;
 }
 
 bool WildMidiHelper::initialize()
diff --git a/src/plugins/Input/wildmidi/wildmidihelper.h b/src/plugins/Input/wildmidi/wildmidihelper.h
index 9c4141ecd..7d50775c7 100644
--- a/src/plugins/Input/wildmidi/wildmidihelper.h
+++ b/src/plugins/Input/wildmidi/wildmidihelper.h
@@ -29,7 +29,7 @@ class WildMidiHelper : public QObject
 {
 Q_OBJECT
 public:
-    explicit WildMidiHelper(QObject *parent = 0);
+    explicit WildMidiHelper(QObject *parent = nullptr);
     ~WildMidiHelper();
     bool initialize();
     void readSettings();
diff --git a/src/plugins/Output/alsa/outputalsa.cpp b/src/plugins/Output/alsa/outputalsa.cpp
index 92f3ede32..3499097ea 100644
--- a/src/plugins/Output/alsa/outputalsa.cpp
+++ b/src/plugins/Output/alsa/outputalsa.cpp
@@ -39,8 +39,8 @@ OutputALSA::OutputALSA() : m_inited(false)
     QString dev_name = settings.value("ALSA/device","default").toString();
     m_use_mmap = settings.value("ALSA/use_mmap", false).toBool();
     pcm_name = strdup(dev_name.toLatin1().data());
-    pcm_handle = 0;
-    m_prebuf = 0;
+    pcm_handle = nullptr;
+    m_prebuf = nullptr;
     m_prebuf_size = 0;
     m_prebuf_fill = 0;
     m_can_pause = false;
@@ -90,8 +90,8 @@ bool OutputALSA::initialize(quint32 freq, ChannelMap map, Qmmp::AudioFormat form
     bool use_pause =  settings.value("use_snd_pcm_pause", false).toBool();
     settings.endGroup();
 
-    snd_pcm_hw_params_t *hwparams = 0;
-    snd_pcm_sw_params_t *swparams = 0;
+    snd_pcm_hw_params_t *hwparams = nullptr;
+    snd_pcm_sw_params_t *swparams = nullptr;
     int err; //alsa error code
 
     //hw params
@@ -143,7 +143,7 @@ bool OutputALSA::initialize(quint32 freq, ChannelMap map, Qmmp::AudioFormat form
     }
     exact_rate = rate;
 
-    if ((err = snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &exact_rate, 0)) < 0)
+    if ((err = snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &exact_rate, nullptr)) < 0)
     {
         qWarning("OutputALSA: Error setting rate: %s", snd_strerror(err));
         return false;
@@ -164,12 +164,12 @@ bool OutputALSA::initialize(quint32 freq, ChannelMap map, Qmmp::AudioFormat form
         qWarning("OutputALSA: The channel number %d is not supported by your hardware", map.count());
         qWarning("==> Using %d instead.", c);
     }
-    if ((err = snd_pcm_hw_params_set_period_time_near(pcm_handle, hwparams, &period_time ,0)) < 0)
+    if ((err = snd_pcm_hw_params_set_period_time_near(pcm_handle, hwparams, &period_time, nullptr)) < 0)
     {
         qWarning("OutputALSA: Error setting period time: %s", snd_strerror(err));
         return false;
     }
-    if ((err = snd_pcm_hw_params_set_buffer_time_near(pcm_handle, hwparams, &buffer_time ,0)) < 0)
+    if ((err = snd_pcm_hw_params_set_buffer_time_near(pcm_handle, hwparams, &buffer_time, nullptr)) < 0)
     {
         qWarning("OutputALSA: Error setting buffer time: %s", snd_strerror(err));
         return false;
@@ -187,7 +187,7 @@ bool OutputALSA::initialize(quint32 freq, ChannelMap map, Qmmp::AudioFormat form
         qWarning("OutputALSA: Error reading buffer size: %s", snd_strerror(err));
         return false;
     }
-    if ((err = snd_pcm_hw_params_get_period_size(hwparams, &period_size, 0)) < 0)
+    if ((err = snd_pcm_hw_params_get_period_size(hwparams, &period_size, nullptr)) < 0)
     {
         qWarning("OutputALSA: Error reading period size: %s", snd_strerror(err));
         return false;
@@ -389,18 +389,18 @@ void OutputALSA::uninitialize()
         snd_pcm_drop(pcm_handle);
         qDebug("OutputALSA: closing pcm_handle");
         snd_pcm_close(pcm_handle);
-        pcm_handle = 0;
+        pcm_handle = nullptr;
     }
     if (m_prebuf)
         free(m_prebuf);
-    m_prebuf = 0;
+    m_prebuf = nullptr;
 }
 /* ****** MIXER ******* */
 
 VolumeALSA::VolumeALSA()
 {
     //alsa mixer
-    m_mixer = 0;
+    m_mixer = nullptr;
     QSettings settings(Qmmp::configFile(), QSettings::IniFormat);
     QString card = settings.value("ALSA/mixer_card","hw:0").toString();
     QString dev = settings.value("ALSA/mixer_device", "PCM").toString();
@@ -443,7 +443,7 @@ int VolumeALSA::setupMixer(QString card, QString device)
 {
     char *name;
     int err, index;
-    pcm_element = 0;
+    pcm_element = nullptr;
 
     qDebug("OutputALSA: setupMixer()");
 
@@ -543,7 +543,7 @@ int VolumeALSA::getMixer(snd_mixer_t **mixer, QString card)
                  qPrintable(card), snd_strerror(-err));
         return -1;
     }
-    if ((err = snd_mixer_selem_register(*mixer, NULL, NULL)) < 0)
+    if ((err = snd_mixer_selem_register(*mixer, nullptr, nullptr)) < 0)
     {
         qWarning("OutputALSA: Failed to register mixer: %s",
                  snd_strerror(-err));
diff --git a/src/plugins/Output/alsa/settingsdialog.cpp b/src/plugins/Output/alsa/settingsdialog.cpp
index df46925f3..c6e9a82e7 100644
--- a/src/plugins/Output/alsa/settingsdialog.cpp
+++ b/src/plugins/Output/alsa/settingsdialog.cpp
@@ -90,7 +90,7 @@ void SettingsDialog::getCards()
 
 void SettingsDialog::getSoftDevices()
 {
-    void **hints = 0;
+    void **hints = nullptr;
     int i = 0;
 
     if(snd_device_name_hint(-1, "pcm", &hints) < 0)
@@ -247,7 +247,7 @@ int SettingsDialog::getMixer(snd_mixer_t **mixer, QString card)
                  "Attaching to mixer %s failed: %s", qPrintable(card), snd_strerror(-err));
         return -1;
     }
-    if ((err = snd_mixer_selem_register(*mixer, NULL, NULL)) < 0)
+    if ((err = snd_mixer_selem_register(*mixer, nullptr, nullptr)) < 0)
     {
         qWarning("SettingsDialog (ALSA): alsa_get_mixer(): "
                  "Failed to register mixer: %s", snd_strerror(-err));
@@ -260,7 +260,7 @@ int SettingsDialog::getMixer(snd_mixer_t **mixer, QString card)
         return -1;
     }
 
-    return (*mixer != NULL);
+    return (*mixer != nullptr);
 }
 
 void SettingsDialog::showMixerDevices(int d)
diff --git a/src/plugins/Output/alsa/settingsdialog.h b/src/plugins/Output/alsa/settingsdialog.h
index f71912599..60b85d99c 100644
--- a/src/plugins/Output/alsa/settingsdialog.h
+++ b/src/plugins/Output/alsa/settingsdialog.h
@@ -35,7 +35,7 @@ class SettingsDialog : public QDialog
 {
 Q_OBJECT
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
 
     ~SettingsDialog();
 
diff --git a/src/plugins/Output/jack/outputjackfactory.cpp b/src/plugins/Output/jack/outputjackfactory.cpp
index 2995e4290..a388980ea 100644
--- a/src/plugins/Output/jack/outputjackfactory.cpp
+++ b/src/plugins/Output/jack/outputjackfactory.cpp
@@ -41,7 +41,7 @@ Output* OutputJACKFactory::create()
 
 Volume *OutputJACKFactory::createVolume()
 {
-    return 0;
+    return nullptr;
 }
 
 void OutputJACKFactory::showSettings(QWidget*)
diff --git a/src/plugins/Output/null/outputnullfactory.cpp b/src/plugins/Output/null/outputnullfactory.cpp
index b7a96921b..9f2e8a9ac 100644
--- a/src/plugins/Output/null/outputnullfactory.cpp
+++ b/src/plugins/Output/null/outputnullfactory.cpp
@@ -41,7 +41,7 @@ Output* OutputNullFactory::create()
 
 Volume *OutputNullFactory::createVolume()
 {
-    return 0;
+    return nullptr;
 }
 
 void OutputNullFactory::showSettings(QWidget* parent)
diff --git a/src/plugins/Output/oss/settingsdialog.h b/src/plugins/Output/oss/settingsdialog.h
index b68767f46..36f088f1e 100644
--- a/src/plugins/Output/oss/settingsdialog.h
+++ b/src/plugins/Output/oss/settingsdialog.h
@@ -30,7 +30,7 @@ class SettingsDialog : public QDialog
 {
 Q_OBJECT
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
 
     ~SettingsDialog();
 
diff --git a/src/plugins/Output/oss4/outputoss4.cpp b/src/plugins/Output/oss4/outputoss4.cpp
index b353e16b5..291243d68 100644
--- a/src/plugins/Output/oss4/outputoss4.cpp
+++ b/src/plugins/Output/oss4/outputoss4.cpp
@@ -44,8 +44,8 @@ extern "C"
 #include <qmmp/visual.h>
 #include "outputoss4.h"
 
-OutputOSS4 *OutputOSS4::m_instance = 0;
-VolumeOSS4 *OutputOSS4::m_vc = 0;
+OutputOSS4 *OutputOSS4::m_instance = nullptr;
+VolumeOSS4 *OutputOSS4::m_vc = nullptr;
 Qmmp::ChannelPosition OutputOSS4::m_oss_pos[16] =
 {
     Qmmp::CHAN_NULL,         //0 = null
@@ -83,7 +83,7 @@ OutputOSS4::~OutputOSS4()
         close(m_audio_fd);
         m_audio_fd = -1;
     }
-    m_instance = 0;
+    m_instance = nullptr;
 }
 
 int OutputOSS4::fd()
@@ -108,7 +108,7 @@ void OutputOSS4::sync()
 
 bool OutputOSS4::initialize(quint32 freq, ChannelMap map, Qmmp::AudioFormat format)
 {
-    m_audio_fd = open(m_audio_device.toLatin1(), O_WRONLY);
+    m_audio_fd = open(m_audio_device.toLatin1().constData(), O_WRONLY);
 
     if (m_audio_fd < 0)
     {
@@ -209,7 +209,7 @@ VolumeOSS4::~VolumeOSS4()
 {
     VolumeSettings vol = volume();
     m_volume = (vol.right << 8) | vol.left;
-    OutputOSS4::m_vc = 0;
+    OutputOSS4::m_vc = nullptr;
     QSettings settings(Qmmp::configFile(), QSettings::IniFormat);
     settings.setValue("OSS4/volume", m_volume);
 }
diff --git a/src/plugins/Output/pulseaudio/outputpulseaudio.cpp b/src/plugins/Output/pulseaudio/outputpulseaudio.cpp
index a243ca877..938b49caf 100644
--- a/src/plugins/Output/pulseaudio/outputpulseaudio.cpp
+++ b/src/plugins/Output/pulseaudio/outputpulseaudio.cpp
@@ -25,14 +25,14 @@ extern "C"{
 #include <QSettings>
 #include "outputpulseaudio.h"
 
-OutputPulseAudio *OutputPulseAudio::instance = 0;
-VolumePulseAudio *OutputPulseAudio::volumeControl = 0;
+OutputPulseAudio *OutputPulseAudio::instance = nullptr;
+VolumePulseAudio *OutputPulseAudio::volumeControl = nullptr;
 
 OutputPulseAudio::OutputPulseAudio(): Output()
 {
-    m_loop = 0;
-    m_ctx = 0;
-    m_stream = 0;
+    m_loop = nullptr;
+    m_ctx = nullptr;
+    m_stream = nullptr;
 
     m_pa_channels[Qmmp::CHAN_NULL] = PA_CHANNEL_POSITION_INVALID;
     m_pa_channels[Qmmp::CHAN_FRONT_CENTER] = PA_CHANNEL_POSITION_MONO;
@@ -52,7 +52,7 @@ OutputPulseAudio::OutputPulseAudio(): Output()
 OutputPulseAudio::~OutputPulseAudio()
 {
     uninitialize();
-    instance = 0;
+    instance = nullptr;
 }
 
 bool OutputPulseAudio::initialize(quint32 freq, ChannelMap map, Qmmp::AudioFormat format)
@@ -69,7 +69,7 @@ bool OutputPulseAudio::initialize(quint32 freq, ChannelMap map, Qmmp::AudioForma
         return false;
     }
 
-    if(pa_context_connect(m_ctx, 0, (pa_context_flags_t)0, 0) < 0)
+    if(pa_context_connect(m_ctx, nullptr, (pa_context_flags_t)0, nullptr) < 0)
     {
         qWarning("OutputPulseAudio: unable to connect the context: %s", pa_strerror(pa_context_errno(m_ctx)));
         return false;
@@ -129,14 +129,14 @@ bool OutputPulseAudio::initialize(quint32 freq, ChannelMap map, Qmmp::AudioForma
     attr.fragsize = attr.tlength;
 
     pa_stream_flags_t flags = pa_stream_flags_t(PA_STREAM_INTERPOLATE_TIMING | PA_STREAM_AUTO_TIMING_UPDATE);
-    pa_cvolume *pvol = 0;
+    pa_cvolume *pvol = nullptr;
     pa_cvolume vol;
     if(volumeControl)
     {
         vol = VolumePulseAudio::volumeSettingsToCvolume(volumeControl->volume(), map.count());
         pvol = &vol;
     }
-    if(pa_stream_connect_playback(m_stream, 0, &attr, flags, pvol, 0) < 0)
+    if(pa_stream_connect_playback(m_stream, nullptr, &attr, flags, pvol, nullptr) < 0)
     {
         qWarning("OutputPulseAudio: unable to connect playback: %s", pa_strerror(pa_context_errno(m_ctx)));
         return false;
@@ -191,7 +191,7 @@ qint64 OutputPulseAudio::writeAudio(unsigned char *data, qint64 maxSize)
     }
 
     size_t length = qMin(size_t(maxSize), pa_stream_writable_size(m_stream));
-    if(pa_stream_write(m_stream, data, length, 0, 0, PA_SEEK_RELATIVE) < 0)
+    if(pa_stream_write(m_stream, data, length, nullptr, 0, PA_SEEK_RELATIVE) < 0)
     {
         qWarning("OutputPulseAudio: pa_stream_write failed: %s", pa_strerror(pa_context_errno(m_ctx)));
         return -1;
@@ -201,25 +201,25 @@ qint64 OutputPulseAudio::writeAudio(unsigned char *data, qint64 maxSize)
 
 void OutputPulseAudio::drain()
 {
-    pa_operation *op = pa_stream_drain(m_stream, OutputPulseAudio::stream_success_cb, 0);
+    pa_operation *op = pa_stream_drain(m_stream, OutputPulseAudio::stream_success_cb, nullptr);
     process(op);
 }
 
 void OutputPulseAudio::reset()
 {
-    pa_operation *op = pa_stream_flush(m_stream, OutputPulseAudio::stream_success_cb, 0);
+    pa_operation *op = pa_stream_flush(m_stream, OutputPulseAudio::stream_success_cb, nullptr);
     process(op);
 }
 
 void OutputPulseAudio::suspend()
 {
-    pa_operation *op = pa_stream_cork(m_stream, 1, OutputPulseAudio::stream_success_cb, 0);
+    pa_operation *op = pa_stream_cork(m_stream, 1, OutputPulseAudio::stream_success_cb, nullptr);
     process(op);
 }
 
 void OutputPulseAudio::resume()
 {
-    pa_operation *op = pa_stream_cork(m_stream, 0, OutputPulseAudio::stream_success_cb, 0);
+    pa_operation *op = pa_stream_cork(m_stream, 0, OutputPulseAudio::stream_success_cb, nullptr);
     process(op);
 }
 
@@ -227,7 +227,7 @@ void OutputPulseAudio::setVolume(const VolumeSettings &v)
 {
     pa_cvolume volume = VolumePulseAudio::volumeSettingsToCvolume(v, audioParameters().channels());
     pa_operation *op = pa_context_set_sink_input_volume(m_ctx, pa_stream_get_index(m_stream), &volume,
-                                                        OutputPulseAudio::context_success_cb, 0);
+                                                        OutputPulseAudio::context_success_cb, nullptr);
     pa_operation_unref(op);
 }
 
@@ -237,20 +237,20 @@ void OutputPulseAudio::uninitialize()
     {
         pa_stream_disconnect(m_stream);
         pa_stream_unref(m_stream);
-        m_stream = 0;
+        m_stream = nullptr;
     }
 
     if(m_ctx)
     {
         pa_context_disconnect(m_ctx);
         pa_context_unref(m_ctx);
-        m_ctx = 0;
+        m_ctx = nullptr;
     }
 
     if(m_loop)
     {
         pa_mainloop_free(m_loop);
-        m_loop = 0;
+        m_loop = nullptr;
     }
 }
 
@@ -291,7 +291,7 @@ void OutputPulseAudio::subscribe_cb(pa_context *ctx, pa_subscription_event_type
              t != (PA_SUBSCRIPTION_EVENT_SINK_INPUT | PA_SUBSCRIPTION_EVENT_CHANGE)))
         return;
 
-    if(!(op = pa_context_get_sink_input_info (ctx, index, OutputPulseAudio::info_cb, 0)))
+    if(!(op = pa_context_get_sink_input_info (ctx, index, OutputPulseAudio::info_cb, nullptr)))
     {
         qWarning("OutputPulseAudio: pa_context_get_sink_input_info failed: %s", pa_strerror(pa_context_errno(ctx)));
         return;
@@ -338,7 +338,7 @@ VolumePulseAudio::~VolumePulseAudio()
     QSettings settings(Qmmp::configFile(), QSettings::IniFormat);
     settings.setValue("PulseAudio/left_volume", m_volume.left);
     settings.setValue("PulseAudio/right_volume", m_volume.right);
-    OutputPulseAudio::volumeControl = 0;
+    OutputPulseAudio::volumeControl = nullptr;
 }
 
 void VolumePulseAudio::updateVolume(const pa_cvolume &v)
diff --git a/src/plugins/Output/shout/outputshoutfactory.cpp b/src/plugins/Output/shout/outputshoutfactory.cpp
index 47937a7a9..07d3e44e8 100644
--- a/src/plugins/Output/shout/outputshoutfactory.cpp
+++ b/src/plugins/Output/shout/outputshoutfactory.cpp
@@ -50,7 +50,7 @@ Output* OutputShoutFactory::create()
 
 Volume *OutputShoutFactory::createVolume()
 {
-    return 0;
+    return nullptr;
 }
 
 void OutputShoutFactory::showSettings(QWidget* parent)
@@ -63,7 +63,7 @@ void OutputShoutFactory::showAbout(QWidget *parent)
 {
    QMessageBox::about (parent, tr("About Icecast Output Plugin"),
                        tr("Qmmp Icecast Output Plugin")+"\n"+
-                       tr("Compiled against libshout-%1").arg(shout_version(0,0,0))+"\n"+
+                       tr("Compiled against libshout-%1").arg(shout_version(nullptr,nullptr,nullptr))+"\n"+
                        tr("Written by: Ilya Kotov <forkotov02@ya.ru>"));
 }
 
diff --git a/src/plugins/Output/shout/settingsdialog.h b/src/plugins/Output/shout/settingsdialog.h
index 0228a4abf..4e44cfd2a 100644
--- a/src/plugins/Output/shout/settingsdialog.h
+++ b/src/plugins/Output/shout/settingsdialog.h
@@ -32,7 +32,7 @@ class SettingsDialog : public QDialog
     Q_OBJECT
 
 public:
-    explicit SettingsDialog(QWidget *parent = 0);
+    explicit SettingsDialog(QWidget *parent = nullptr);
     ~SettingsDialog();
 
 public slots:
diff --git a/src/plugins/Output/shout/shoutoutput.cpp b/src/plugins/Output/shout/shoutoutput.cpp
index 6be627357..9ca6e9a95 100644
--- a/src/plugins/Output/shout/shoutoutput.cpp
+++ b/src/plugins/Output/shout/shoutoutput.cpp
@@ -28,11 +28,11 @@
 ShoutOutput::ShoutOutput(ShoutClient *m)
 {
     m_client = m;
-    m_soxr = 0;
+    m_soxr = nullptr;
     m_ratio = 0;
-    m_soxr_buf = 0;
+    m_soxr_buf = nullptr;
     m_soxr_buf_frames = 0;
-    qsrand(time(NULL));
+    qsrand(time(nullptr));
 }
 
 ShoutOutput::~ShoutOutput()
@@ -46,12 +46,12 @@ ShoutOutput::~ShoutOutput()
     if(m_soxr)
     {
         soxr_delete(m_soxr);
-        m_soxr = 0;
+        m_soxr = nullptr;
     }
     if(m_soxr_buf)
     {
         free(m_soxr_buf);
-        m_soxr_buf = 0;
+        m_soxr_buf = nullptr;
     }
 }
 
@@ -63,7 +63,7 @@ bool ShoutOutput::initialize(quint32 freq, ChannelMap map, Qmmp::AudioFormat)
 
     if(freq != outFreq)
     {
-        m_soxr = soxr_create(freq, outFreq, map.size(), 0, 0, 0, 0);
+        m_soxr = soxr_create(freq, outFreq, map.size(), nullptr, nullptr, nullptr, nullptr);
         m_ratio = (double)outFreq/freq;
     }
 
@@ -90,7 +90,7 @@ qint64 ShoutOutput::writeAudio(unsigned char *data, qint64 maxSize)
 {
     int chan = channels();
     int frames = maxSize / chan / sizeof(float);
-    float *input_data = 0;
+    float *input_data = nullptr;
 
     if(m_soxr)
     {
@@ -102,7 +102,7 @@ qint64 ShoutOutput::writeAudio(unsigned char *data, qint64 maxSize)
         }
 
         size_t done = 0;
-        soxr_process(m_soxr, data, frames, 0,  m_soxr_buf, m_soxr_buf_frames, &done);
+        soxr_process(m_soxr, data, frames, nullptr,  m_soxr_buf, m_soxr_buf_frames, &done);
         input_data = m_soxr_buf;
         if(done == 0) //soxr requires more data
             return maxSize;
@@ -136,7 +136,7 @@ qint64 ShoutOutput::writeAudio(unsigned char *data, qint64 maxSize)
     while(ok && vorbis_analysis_blockout(&m_vd, &m_vb) == 1)
     {
         // analysis, assume we want to use bitrate management
-        vorbis_analysis(&m_vb, NULL);
+        vorbis_analysis(&m_vb, nullptr);
         vorbis_bitrate_addblock(&m_vb);
 
         while(ok && vorbis_bitrate_flushpacket(&m_vd, &m_op))
@@ -214,7 +214,7 @@ void ShoutOutput::setTrackInfo(const QMap<Qmmp::MetaData, QString> &metaData)
         { Qmmp::YEAR, "date"},
         { Qmmp::COMPOSER, "composer"},
         { Qmmp::DISCNUMBER, "discnumber"},
-        { Qmmp::UNKNOWN, 0}
+        { Qmmp::UNKNOWN, nullptr}
     };
 
     int i = 0;
diff --git a/src/plugins/Output/wasapi/settingsdialog.h b/src/plugins/Output/wasapi/settingsdialog.h
index 491f7e917..61dadeebb 100644
--- a/src/plugins/Output/wasapi/settingsdialog.h
+++ b/src/plugins/Output/wasapi/settingsdialog.h
@@ -28,7 +28,7 @@ class SettingsDialog : public QDialog
 {

     Q_OBJECT

 public:

-    explicit SettingsDialog(QWidget *parent = 0);

+    explicit SettingsDialog(QWidget *parent = nullptr);

 

 public slots:

     void accept();

diff --git a/src/plugins/Transports/http/httpinputfactory.h b/src/plugins/Transports/http/httpinputfactory.h
index 215bacb56..5e5e37d52 100644
--- a/src/plugins/Transports/http/httpinputfactory.h
+++ b/src/plugins/Transports/http/httpinputfactory.h
@@ -35,7 +35,7 @@ Q_PLUGIN_METADATA(IID "org.qmmp.qmmp.InputSourceFactoryInterface.1.0")
 Q_INTERFACES(InputSourceFactory)
 public:
     InputSourceProperties properties() const;
-    InputSource *create(const QString &url, QObject *parent = 0);
+    InputSource *create(const QString &url, QObject *parent = nullptr);
     void showSettings(QWidget *parent);
     void showAbout(QWidget *parent);
     QString translation() const;
diff --git a/src/plugins/Transports/http/httpinputsource.h b/src/plugins/Transports/http/httpinputsource.h
index d109589f3..809b27ac5 100644
--- a/src/plugins/Transports/http/httpinputsource.h
+++ b/src/plugins/Transports/http/httpinputsource.h
@@ -32,7 +32,7 @@ class HTTPInputSource : public InputSource
 {
 Q_OBJECT
 public:
-    HTTPInputSource(const QString &path, QObject *parent = 0);
+    HTTPInputSource(const QString &path, QObject *parent = nullptr);
 
     QIODevice *ioDevice();
     bool initialize();
diff --git a/src/plugins/Transports/http/httpstreamreader.cpp b/src/plugins/Transports/http/httpstreamreader.cpp
index 258d8c035..eb54bfeb8 100644
--- a/src/plugins/Transports/http/httpstreamreader.cpp
+++ b/src/plugins/Transports/http/httpstreamreader.cpp
@@ -142,11 +142,11 @@ HttpStreamReader::HttpStreamReader(const QString &url, HTTPInputSource *parent)
     curl_global_init(CURL_GLOBAL_ALL);
     m_stream.buf_fill = 0;
     m_stream.buf_size = 0;
-    m_stream.buf = 0;
+    m_stream.buf = nullptr;
     m_stream.icy_meta_data = false;
     m_stream.aborted = true;
     m_stream.icy_metaint = 0;
-    m_handle = 0;
+    m_handle = nullptr;
     m_metacount = 0;
     m_meta_sent = false;
     m_ready = false;
@@ -162,8 +162,8 @@ HttpStreamReader::HttpStreamReader(const QString &url, HTTPInputSource *parent)
     if (!m_codec)
         m_codec = QTextCodec::codecForName ("UTF-8");
 #ifdef WITH_ENCA
-    m_analyser = 0;
-    m_prevCodec = 0;
+    m_analyser = nullptr;
+    m_prevCodec = nullptr;
     if(settings.value("use_enca", false).toBool())
         m_analyser = enca_analyser_alloc(settings.value("enca_lang").toByteArray ().constData());
     if(m_analyser)
@@ -182,7 +182,7 @@ HttpStreamReader::~HttpStreamReader()
     if (m_stream.buf)
         free(m_stream.buf);
 
-    m_stream.buf = 0;
+    m_stream.buf = nullptr;
 #ifdef WITH_ENCA
     if(m_analyser)
         enca_analyser_free(m_analyser);
@@ -307,7 +307,7 @@ void HttpStreamReader::abort()
     if (m_handle)
     {
         curl_easy_cleanup(m_handle);
-        m_handle = 0;
+        m_handle = nullptr;
     }
     QIODevice::close();
 }
@@ -368,15 +368,15 @@ void HttpStreamReader::run()
     // error message
     curl_easy_setopt(m_handle, CURLOPT_ERRORBUFFER, errorBuffer);
 
-    struct curl_slist *http200_aliases = curl_slist_append(NULL, "ICY");
-    struct curl_slist *http_headers = curl_slist_append(NULL, "Icy-MetaData: 1");
+    struct curl_slist *http200_aliases = curl_slist_append(nullptr, "ICY");
+    struct curl_slist *http_headers = curl_slist_append(nullptr, "Icy-MetaData: 1");
     curl_easy_setopt(m_handle, CURLOPT_HTTP200ALIASES, http200_aliases);
     curl_easy_setopt(m_handle, CURLOPT_HTTPHEADER, http_headers);
     m_mutex.lock();
     if(m_stream.buf)
     {
         free(m_stream.buf);
-        m_stream.buf = 0;
+        m_stream.buf = nullptr;
     }
     m_stream.buf_fill = 0;
     m_stream.buf_size = m_prebuffer_size * 2;
diff --git a/src/plugins/Transports/http/settingsdialog.h b/src/plugins/Transports/http/settingsdialog.h
index ae6c66f1b..d85dc2d69 100644
--- a/src/plugins/Transports/http/settingsdialog.h
+++ b/src/plugins/Transports/http/settingsdialog.h
@@ -30,7 +30,7 @@ class SettingsDialog : public QDialog
 {
 Q_OBJECT
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
 
     ~SettingsDialog();
 
diff --git a/src/plugins/Transports/mms/mmsinputfactory.h b/src/plugins/Transports/mms/mmsinputfactory.h
index d9f083262..da9698eb6 100644
--- a/src/plugins/Transports/mms/mmsinputfactory.h
+++ b/src/plugins/Transports/mms/mmsinputfactory.h
@@ -35,7 +35,7 @@ Q_PLUGIN_METADATA(IID "org.qmmp.qmmp.InputSourceFactoryInterface.1.0")
 Q_INTERFACES(InputSourceFactory)
 public:
     InputSourceProperties properties() const;
-    InputSource *create(const QString &url, QObject *parent = 0);
+    InputSource *create(const QString &url, QObject *parent = nullptr);
     void showSettings(QWidget *parent);
     void showAbout(QWidget *parent);
     QString translation() const;
diff --git a/src/plugins/Transports/mms/mmsinputsource.h b/src/plugins/Transports/mms/mmsinputsource.h
index c7105a6c5..d125a2c45 100644
--- a/src/plugins/Transports/mms/mmsinputsource.h
+++ b/src/plugins/Transports/mms/mmsinputsource.h
@@ -32,7 +32,7 @@ class MMSInputSource : public InputSource
 {
 Q_OBJECT
 public:
-    MMSInputSource(const QString &path, QObject *parent = 0);
+    MMSInputSource(const QString &path, QObject *parent = nullptr);
 
     QIODevice *ioDevice();
     bool initialize();
diff --git a/src/plugins/Transports/mms/mmsstreamreader.cpp b/src/plugins/Transports/mms/mmsstreamreader.cpp
index 73bb1bdbb..1acbbdb4c 100644
--- a/src/plugins/Transports/mms/mmsstreamreader.cpp
+++ b/src/plugins/Transports/mms/mmsstreamreader.cpp
@@ -31,7 +31,7 @@ MMSStreamReader::MMSStreamReader(const QString &url, MMSInputSource *parent) : Q
 {
     m_parent = parent;
     m_url = url;
-    m_handle = 0;
+    m_handle = nullptr;
     m_aborted = false;
     QSettings settings(Qmmp::configFile(), QSettings::IniFormat);
     m_prebuf_size = settings.value("MMS/buffer_size",384).toInt() * 1024;
@@ -47,7 +47,7 @@ MMSStreamReader::~MMSStreamReader()
     qDebug("%s", Q_FUNC_INFO);
     abort();
     free(m_buffer);
-    m_buffer = 0;
+    m_buffer = nullptr;
     m_buffer_at = 0;
     m_buffer_size = 0;
 }
@@ -128,7 +128,7 @@ void MMSStreamReader::abort()
     m_ready = false;
     if (m_handle)
         mmsx_close(m_handle);
-    m_handle = 0;
+    m_handle = nullptr;
 }
 
 qint64 MMSStreamReader::bytesAvailable() const
@@ -140,7 +140,7 @@ void MMSStreamReader::run()
 {
     int to_read = 1024;
     char prebuf[to_read];
-    m_handle = mmsx_connect (0, 0, m_url.toLocal8Bit().constData(), 128 * 1024);
+    m_handle = mmsx_connect (nullptr, nullptr, m_url.toLocal8Bit().constData(), 128 * 1024);
     if(!m_handle)
     {
         qWarning("MMSStreamReader: connection failed");
@@ -168,7 +168,7 @@ void MMSStreamReader::run()
             m_buffer = (char *)realloc(m_buffer, m_buffer_size);
         }
         m_mutex.unlock();
-        len = mmsx_read (0, m_handle, prebuf, to_read);
+        len = mmsx_read (nullptr, m_handle, prebuf, to_read);
         m_mutex.lock();
         if(len < 0)
         {
diff --git a/src/plugins/Transports/mms/settingsdialog.h b/src/plugins/Transports/mms/settingsdialog.h
index cbf94c84d..8d109b132 100644
--- a/src/plugins/Transports/mms/settingsdialog.h
+++ b/src/plugins/Transports/mms/settingsdialog.h
@@ -30,7 +30,7 @@ class SettingsDialog : public QDialog
 {
 Q_OBJECT
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
 
     ~SettingsDialog();
 
diff --git a/src/plugins/Ui/qsui/aboutqsuidialog.h b/src/plugins/Ui/qsui/aboutqsuidialog.h
index a93e894a3..192ce37b1 100644
--- a/src/plugins/Ui/qsui/aboutqsuidialog.h
+++ b/src/plugins/Ui/qsui/aboutqsuidialog.h
@@ -31,7 +31,7 @@ class AboutQSUIDialog : public QDialog
 {
     Q_OBJECT
 public:
-    explicit AboutQSUIDialog(QWidget *parent = 0);
+    explicit AboutQSUIDialog(QWidget *parent = nullptr);
     virtual ~AboutQSUIDialog();
 
 private:
diff --git a/src/plugins/Ui/qsui/actionmanager.cpp b/src/plugins/Ui/qsui/actionmanager.cpp
index c3ae20fc5..03d900624 100644
--- a/src/plugins/Ui/qsui/actionmanager.cpp
+++ b/src/plugins/Ui/qsui/actionmanager.cpp
@@ -28,7 +28,7 @@
 #include <qmmp/qmmp.h>
 #include "actionmanager.h"
 
-ActionManager *ActionManager::m_instance = 0;
+ActionManager *ActionManager::m_instance = nullptr;
 
 ActionManager::ActionManager(QObject *parent) :
     QObject(parent)
@@ -59,10 +59,10 @@ ActionManager::ActionManager(QObject *parent) :
     //view
     m_actions[WM_ALLWAYS_ON_TOP] = createAction2(tr("Always on Top"), "always_on_top", "");
     m_actions[WM_STICKY] = createAction2(tr("Put on All Workspaces"), "sticky", "");
-    m_actions[UI_ANALYZER] = 0; //external action
-    m_actions[UI_FILEBROWSER] = 0; //external action
-    m_actions[UI_COVER] = 0; //external action
-    m_actions[UI_PLAYLISTBROWSER] = 0; //external action
+    m_actions[UI_ANALYZER] = nullptr; //external action
+    m_actions[UI_FILEBROWSER] = nullptr; //external action
+    m_actions[UI_COVER] = nullptr; //external action
+    m_actions[UI_PLAYLISTBROWSER] = nullptr; //external action
     m_actions[UI_SHOW_TABS] = createAction2(tr("Show Tabs"), "show_tabs", "");
     m_actions[UI_SHOW_TITLEBARS] = createAction2(tr("Show Title Bars"), "show_titlebars", "");
     m_actions[UI_BLOCK_TOOLBARS] = createAction2(tr("Block Toolbars"), "block_toolbars", "");
@@ -112,14 +112,14 @@ ActionManager::ActionManager(QObject *parent) :
     m_settings->endGroup();
     readStates();
     delete m_settings;
-    m_settings = 0;
+    m_settings = nullptr;
     m_actions[ABOUT]->setIcon(qApp->windowIcon());
 }
 
 ActionManager::~ActionManager()
 {
     saveStates();
-    m_instance = 0;
+    m_instance = nullptr;
 }
 
 QAction *ActionManager::action(int type)
diff --git a/src/plugins/Ui/qsui/actionmanager.h b/src/plugins/Ui/qsui/actionmanager.h
index 163443b84..a33b0fed2 100644
--- a/src/plugins/Ui/qsui/actionmanager.h
+++ b/src/plugins/Ui/qsui/actionmanager.h
@@ -40,7 +40,7 @@ class ActionManager : public QObject
 {
     Q_OBJECT
 public:
-    explicit ActionManager(QObject *parent = 0);
+    explicit ActionManager(QObject *parent = nullptr);
     ~ActionManager();
 
     enum Type
diff --git a/src/plugins/Ui/qsui/colorwidget.h b/src/plugins/Ui/qsui/colorwidget.h
index 86d915a09..1f8049ef5 100644
--- a/src/plugins/Ui/qsui/colorwidget.h
+++ b/src/plugins/Ui/qsui/colorwidget.h
@@ -30,7 +30,7 @@ class ColorWidget : public QFrame
 {
     Q_OBJECT
 public:
-    ColorWidget(QWidget *parent = 0);
+    ColorWidget(QWidget *parent = nullptr);
 
     ~ColorWidget();
 
diff --git a/src/plugins/Ui/qsui/coverwidget.h b/src/plugins/Ui/qsui/coverwidget.h
index 92a324de1..e66dfad35 100644
--- a/src/plugins/Ui/qsui/coverwidget.h
+++ b/src/plugins/Ui/qsui/coverwidget.h
@@ -32,7 +32,7 @@ class CoverWidget : public QWidget
 {
 Q_OBJECT
 public:
-    CoverWidget(QWidget *parent = 0);
+    CoverWidget(QWidget *parent = nullptr);
 
     ~CoverWidget();
 
diff --git a/src/plugins/Ui/qsui/elidinglabel.h b/src/plugins/Ui/qsui/elidinglabel.h
index 70e35fd2f..f348bcfc1 100644
--- a/src/plugins/Ui/qsui/elidinglabel.h
+++ b/src/plugins/Ui/qsui/elidinglabel.h
@@ -41,8 +41,8 @@ class  /*QTCREATOR_UTILS_EXPORT*/ ElidingLabel : public QLabel
     Q_PROPERTY(Qt::TextElideMode elideMode READ elideMode WRITE setElideMode DESIGNABLE true)
 
 public:
-    explicit ElidingLabel(QWidget *parent = 0);
-    explicit ElidingLabel(const QString &text, QWidget *parent = 0);
+    explicit ElidingLabel(QWidget *parent = nullptr);
+    explicit ElidingLabel(const QString &text, QWidget *parent = nullptr);
 
     Qt::TextElideMode elideMode() const;
     void setElideMode(const Qt::TextElideMode &elideMode);
diff --git a/src/plugins/Ui/qsui/equalizer.h b/src/plugins/Ui/qsui/equalizer.h
index 86434b40a..5ee8f5c6c 100644
--- a/src/plugins/Ui/qsui/equalizer.h
+++ b/src/plugins/Ui/qsui/equalizer.h
@@ -38,7 +38,7 @@ class Equalizer : public QDialog
 {
     Q_OBJECT
 public:
-    explicit Equalizer(QWidget *parent = 0);
+    explicit Equalizer(QWidget *parent = nullptr);
     ~Equalizer();
 
 
diff --git a/src/plugins/Ui/qsui/filesystembrowser.h b/src/plugins/Ui/qsui/filesystembrowser.h
index 802204620..1a01cfcad 100644
--- a/src/plugins/Ui/qsui/filesystembrowser.h
+++ b/src/plugins/Ui/qsui/filesystembrowser.h
@@ -42,7 +42,7 @@ class FileSystemBrowser : public QWidget
 {
     Q_OBJECT
 public:
-    explicit FileSystemBrowser(QWidget *parent = 0);
+    explicit FileSystemBrowser(QWidget *parent = nullptr);
     ~FileSystemBrowser();
 
     void readSettings();
diff --git a/src/plugins/Ui/qsui/hotkeyeditor.h b/src/plugins/Ui/qsui/hotkeyeditor.h
index 91fe490a0..786e4d7f7 100644
--- a/src/plugins/Ui/qsui/hotkeyeditor.h
+++ b/src/plugins/Ui/qsui/hotkeyeditor.h
@@ -35,7 +35,7 @@ class HotkeyEditor : public QWidget
     Q_OBJECT
 
 public:
-    explicit HotkeyEditor(QWidget *parent = 0);
+    explicit HotkeyEditor(QWidget *parent = nullptr);
     virtual ~HotkeyEditor();
 
 private slots:
diff --git a/src/plugins/Ui/qsui/keyboardmanager.cpp b/src/plugins/Ui/qsui/keyboardmanager.cpp
index 9820984b8..b1c447258 100644
--- a/src/plugins/Ui/qsui/keyboardmanager.cpp
+++ b/src/plugins/Ui/qsui/keyboardmanager.cpp
@@ -30,7 +30,7 @@
 KeyboardManager::KeyboardManager(QObject *parent) :
     QObject(parent)
 {
-    m_listWidget = 0;
+    m_listWidget = nullptr;
 
     addAction(Qt::Key_Up, SLOT(processUp()));
     addAction(Qt::Key_Up + Qt::ShiftModifier, SLOT(processUp()));
diff --git a/src/plugins/Ui/qsui/keyboardmanager.h b/src/plugins/Ui/qsui/keyboardmanager.h
index 903036095..6aac5d228 100644
--- a/src/plugins/Ui/qsui/keyboardmanager.h
+++ b/src/plugins/Ui/qsui/keyboardmanager.h
@@ -34,7 +34,7 @@ class KeyboardManager : public QObject
 {
     Q_OBJECT
 public:
-    explicit KeyboardManager(QObject *parent = 0);
+    explicit KeyboardManager(QObject *parent = nullptr);
 
     QList<QAction*> actions();
     void setListWidget(ListWidget *listWidget);
diff --git a/src/plugins/Ui/qsui/listwidget.cpp b/src/plugins/Ui/qsui/listwidget.cpp
index ac28992da..0841b5062 100644
--- a/src/plugins/Ui/qsui/listwidget.cpp
+++ b/src/plugins/Ui/qsui/listwidget.cpp
@@ -45,9 +45,9 @@ ListWidget::ListWidget(PlayListModel *model, QWidget *parent)
         : QWidget(parent)
 {
     setFocusPolicy(Qt::StrongFocus);
-    m_popupWidget = 0;
+    m_popupWidget = nullptr;
     m_ui_settings = QmmpUiSettings::instance();
-    m_menu = 0;
+    m_menu = nullptr;
     m_filterMode = false;
     m_model = model;
     m_timer = new QTimer(this);
@@ -67,7 +67,7 @@ ListWidget::ListWidget(PlayListModel *model, QWidget *parent)
     m_row_count = 0;
     m_select_on_release = false;
     m_count = 0;
-    m_firstItem = 0;
+    m_firstItem = nullptr;
 
     setAcceptDrops(true);
     setMouseTracking(true);
@@ -108,7 +108,7 @@ void ListWidget::readSettings()
         if(m_popupWidget)
         {
             m_popupWidget->deleteLater();
-            m_popupWidget = 0;
+            m_popupWidget = nullptr;
         }
     }
     else
@@ -174,13 +174,13 @@ void ListWidget::setModel(PlayListModel *selected, PlayListModel *previous)
     if(previous)
     {
         previous->setProperty("first_visible", m_first);
-        disconnect(previous, 0, this, 0); //disconnect previous model
-        disconnect(previous,0,m_header,0);
+        disconnect(previous, nullptr, this, nullptr); //disconnect previous model
+        disconnect(previous,nullptr,m_header,nullptr);
     }
     qApp->processEvents();
     m_model = selected;
     m_count = m_model->count();
-    m_firstItem = 0;
+    m_firstItem = nullptr;
 
     if(m_model->property("first_visible").isValid())
     {
@@ -436,7 +436,7 @@ void ListWidget::updateList(int flags)
 
         if(!m_filterMode)
         {
-            m_firstItem = m_model->isEmpty() ? 0 : m_model->item(m_first);
+            m_firstItem = m_model->isEmpty() ? nullptr : m_model->item(m_first);
             m_count = m_model->count();
         }
         items = m_filterMode ? m_filteredItems.mid(m_first, m_row_count) : m_model->mid(m_first, m_row_count);
diff --git a/src/plugins/Ui/qsui/listwidget.h b/src/plugins/Ui/qsui/listwidget.h
index ab981f4d5..1ac01cddf 100644
--- a/src/plugins/Ui/qsui/listwidget.h
+++ b/src/plugins/Ui/qsui/listwidget.h
@@ -47,7 +47,7 @@ class ListWidget : public QWidget
 {
     Q_OBJECT
 public:
-    ListWidget(PlayListModel *model, QWidget *parent = 0);
+    ListWidget(PlayListModel *model, QWidget *parent = nullptr);
 
     ~ListWidget();
 
diff --git a/src/plugins/Ui/qsui/listwidgetdrawer.cpp b/src/plugins/Ui/qsui/listwidgetdrawer.cpp
index 5481a21a4..000965152 100644
--- a/src/plugins/Ui/qsui/listwidgetdrawer.cpp
+++ b/src/plugins/Ui/qsui/listwidgetdrawer.cpp
@@ -41,9 +41,9 @@ ListWidgetDrawer::ListWidgetDrawer()
     m_row_height = 0;
     m_number_width = 0;
     m_padding = 0;
-    m_metrics = 0;
-    m_extra_metrics = 0;
-    m_bold_metrics = 0;
+    m_metrics = nullptr;
+    m_extra_metrics = nullptr;
+    m_bold_metrics = nullptr;
     readSettings();
 }
 
@@ -312,7 +312,7 @@ void ListWidgetDrawer::drawTrack(QPainter *painter, ListWidgetRow *row, bool rtl
 
     painter->setFont(m_font);
     painter->setPen(row->flags & ListWidgetRow::SELECTED ? m_highlighted : m_normal);
-    QFontMetrics *metrics = 0;
+    QFontMetrics *metrics = nullptr;
     if(row->flags & ListWidgetRow::CURRENT)
     {
         m_font.setBold(true);
diff --git a/src/plugins/Ui/qsui/logo.h b/src/plugins/Ui/qsui/logo.h
index afbff5947..d8a478125 100644
--- a/src/plugins/Ui/qsui/logo.h
+++ b/src/plugins/Ui/qsui/logo.h
@@ -38,7 +38,7 @@ class Logo : public Visual
 {
     Q_OBJECT
 public:
-    explicit Logo(QWidget *parent = 0);
+    explicit Logo(QWidget *parent = nullptr);
     virtual ~Logo();
 
 public slots:
diff --git a/src/plugins/Ui/qsui/mainwindow.cpp b/src/plugins/Ui/qsui/mainwindow.cpp
index d523aa041..fe1932269 100644
--- a/src/plugins/Ui/qsui/mainwindow.cpp
+++ b/src/plugins/Ui/qsui/mainwindow.cpp
@@ -778,7 +778,7 @@ void MainWindow::readSettings()
     else
     {
         m_addListButton->setVisible(false);
-        m_tabWidget->setCornerWidget(0, Qt::TopLeftCorner);
+        m_tabWidget->setCornerWidget(nullptr, Qt::TopLeftCorner);
     }
     if(settings.value("pl_show_tab_list_menu", false).toBool())
     {
@@ -789,7 +789,7 @@ void MainWindow::readSettings()
     else
     {
         m_tabListMenuButton->setVisible(false);
-        m_tabWidget->setCornerWidget(0, Qt::TopRightCorner);
+        m_tabWidget->setCornerWidget(nullptr, Qt::TopRightCorner);
     }
 
     settings.endGroup();
@@ -878,25 +878,25 @@ void MainWindow::setTitleBarsVisible(bool visible)
 {
     if(visible)
     {
-        QWidget *widget = 0;
+        QWidget *widget = nullptr;
         if((widget = m_ui.analyzerDockWidget->titleBarWidget()))
         {
-            m_ui.analyzerDockWidget->setTitleBarWidget(0);
+            m_ui.analyzerDockWidget->setTitleBarWidget(nullptr);
             delete widget;
         }
         if((widget = m_ui.fileSystemDockWidget->titleBarWidget()))
         {
-            m_ui.fileSystemDockWidget->setTitleBarWidget(0);
+            m_ui.fileSystemDockWidget->setTitleBarWidget(nullptr);
             delete widget;
         }
         if((widget = m_ui.coverDockWidget->titleBarWidget()))
         {
-            m_ui.coverDockWidget->setTitleBarWidget(0);
+            m_ui.coverDockWidget->setTitleBarWidget(nullptr);
             delete widget;
         }
         if((widget = m_ui.playlistsDockWidget->titleBarWidget()))
         {
-            m_ui.playlistsDockWidget->setTitleBarWidget(0);
+            m_ui.playlistsDockWidget->setTitleBarWidget(nullptr);
             delete widget;
         }
     }
diff --git a/src/plugins/Ui/qsui/mainwindow.h b/src/plugins/Ui/qsui/mainwindow.h
index cf51dc826..90d9a9174 100644
--- a/src/plugins/Ui/qsui/mainwindow.h
+++ b/src/plugins/Ui/qsui/mainwindow.h
@@ -52,7 +52,7 @@ class MainWindow : public QMainWindow
 {
 Q_OBJECT
 public:
-    MainWindow(QWidget *parent = 0);
+    MainWindow(QWidget *parent = nullptr);
     ~MainWindow();
 
 private slots:
diff --git a/src/plugins/Ui/qsui/playlistbrowser.h b/src/plugins/Ui/qsui/playlistbrowser.h
index 07aa5b71b..5f5d38df9 100644
--- a/src/plugins/Ui/qsui/playlistbrowser.h
+++ b/src/plugins/Ui/qsui/playlistbrowser.h
@@ -38,7 +38,7 @@ class PlayListBrowser : public QWidget
 {
 Q_OBJECT
 public:
-    PlayListBrowser(PlayListManager *manager, QWidget *parent = 0);
+    PlayListBrowser(PlayListManager *manager, QWidget *parent = nullptr);
     ~PlayListBrowser();
 
 private slots:
diff --git a/src/plugins/Ui/qsui/playlistheader.cpp b/src/plugins/Ui/qsui/playlistheader.cpp
index b6f8a4a43..2ce470fcc 100644
--- a/src/plugins/Ui/qsui/playlistheader.cpp
+++ b/src/plugins/Ui/qsui/playlistheader.cpp
@@ -55,7 +55,7 @@ PlayListHeader::PlayListHeader(QWidget *parent) :
     m_scrollbar_width = 0;
     m_reverted = false;
     m_auto_resize = false;
-    m_metrics = 0;
+    m_metrics = nullptr;
     m_task = NO_TASK;
 
     m_model = PlayListManager::instance()->headerModel();
@@ -96,7 +96,7 @@ PlayListHeader::~PlayListHeader()
 {
     if (m_metrics)
         delete m_metrics;
-    m_metrics = 0;
+    m_metrics = nullptr;
 }
 
 void PlayListHeader::readSettings()
@@ -104,7 +104,7 @@ void PlayListHeader::readSettings()
     if (m_metrics)
     {
         delete m_metrics;
-        m_metrics = 0;
+        m_metrics = nullptr;
     }
 
     QSettings settings(Qmmp::configFile(), QSettings::IniFormat);
diff --git a/src/plugins/Ui/qsui/playlistheader.h b/src/plugins/Ui/qsui/playlistheader.h
index fce8248e3..fa5cafb71 100644
--- a/src/plugins/Ui/qsui/playlistheader.h
+++ b/src/plugins/Ui/qsui/playlistheader.h
@@ -40,7 +40,7 @@ class PlayListHeader : public QWidget
 {
     Q_OBJECT
 public:
-    explicit PlayListHeader(QWidget *parent = 0);
+    explicit PlayListHeader(QWidget *parent = nullptr);
     ~PlayListHeader();
 
     void readSettings();
diff --git a/src/plugins/Ui/qsui/popupsettings.h b/src/plugins/Ui/qsui/popupsettings.h
index 15fd24922..3be5c6daa 100644
--- a/src/plugins/Ui/qsui/popupsettings.h
+++ b/src/plugins/Ui/qsui/popupsettings.h
@@ -30,7 +30,7 @@ class PopupSettings : public QDialog
 {
 Q_OBJECT
 public:
-    PopupSettings(QWidget *parent = 0);
+    PopupSettings(QWidget *parent = nullptr);
     ~PopupSettings();
 
 
diff --git a/src/plugins/Ui/qsui/popupwidget.h b/src/plugins/Ui/qsui/popupwidget.h
index f341f819d..00f3751f1 100644
--- a/src/plugins/Ui/qsui/popupwidget.h
+++ b/src/plugins/Ui/qsui/popupwidget.h
@@ -37,7 +37,7 @@ class PopupWidget : public QWidget
 {
     Q_OBJECT
 public:
-    PopupWidget(QWidget *parent = 0);
+    PopupWidget(QWidget *parent = nullptr);
 
     ~PopupWidget();
 
diff --git a/src/plugins/Ui/qsui/positionslider.h b/src/plugins/Ui/qsui/positionslider.h
index 350c62ea5..ebb3db302 100644
--- a/src/plugins/Ui/qsui/positionslider.h
+++ b/src/plugins/Ui/qsui/positionslider.h
@@ -33,7 +33,7 @@ class PositionSlider : public QSlider
 {
     Q_OBJECT
 public:
-    explicit PositionSlider(QWidget *parent = 0);
+    explicit PositionSlider(QWidget *parent = nullptr);
     virtual ~PositionSlider(){}
 
 protected:
diff --git a/src/plugins/Ui/qsui/qsuianalyzer.cpp b/src/plugins/Ui/qsui/qsuianalyzer.cpp
index e24301ea1..e510c6bc7 100644
--- a/src/plugins/Ui/qsui/qsuianalyzer.cpp
+++ b/src/plugins/Ui/qsui/qsuianalyzer.cpp
@@ -33,9 +33,9 @@
 
 QSUiAnalyzer::QSUiAnalyzer(QWidget *parent) : Visual (parent)
 {
-    m_intern_vis_data = 0;
-    m_peaks = 0;
-    m_x_scale = 0;
+    m_intern_vis_data = nullptr;
+    m_peaks = nullptr;
+    m_x_scale = nullptr;
     m_rows = 0;
     m_cols = 0;
     m_offset = 0;
diff --git a/src/plugins/Ui/qsui/qsuianalyzer.h b/src/plugins/Ui/qsui/qsuianalyzer.h
index 6abb6ad11..b75e9569a 100644
--- a/src/plugins/Ui/qsui/qsuianalyzer.h
+++ b/src/plugins/Ui/qsui/qsuianalyzer.h
@@ -34,7 +34,7 @@ class QSUiAnalyzer : public Visual
 {
     Q_OBJECT
 public:
-    QSUiAnalyzer(QWidget *parent = 0);
+    QSUiAnalyzer(QWidget *parent = nullptr);
     virtual ~QSUiAnalyzer();
 
     void setCover(const QPixmap &pixmap);
diff --git a/src/plugins/Ui/qsui/qsuiquicksearch.h b/src/plugins/Ui/qsui/qsuiquicksearch.h
index 96e96cd29..ec04e3b89 100644
--- a/src/plugins/Ui/qsui/qsuiquicksearch.h
+++ b/src/plugins/Ui/qsui/qsuiquicksearch.h
@@ -35,7 +35,7 @@ class QSUIQuickSearch : public QWidget
 {
     Q_OBJECT
 public:
-    explicit QSUIQuickSearch(ListWidget *listWidget, QWidget *parent = 0);
+    explicit QSUIQuickSearch(ListWidget *listWidget, QWidget *parent = nullptr);
 
 private:
     QLineEdit *m_lineEdit;
diff --git a/src/plugins/Ui/qsui/qsuisettings.h b/src/plugins/Ui/qsui/qsuisettings.h
index 85a718d9e..26a7935e4 100644
--- a/src/plugins/Ui/qsui/qsuisettings.h
+++ b/src/plugins/Ui/qsui/qsuisettings.h
@@ -32,7 +32,7 @@ class QSUISettings : public QWidget
 {
     Q_OBJECT
 public:
-    explicit QSUISettings(QWidget *parent = 0);
+    explicit QSUISettings(QWidget *parent = nullptr);
     virtual ~QSUISettings();
     void writeSettings();
 
diff --git a/src/plugins/Ui/qsui/qsuitabbar.h b/src/plugins/Ui/qsui/qsuitabbar.h
index 3be74a688..955e73c81 100644
--- a/src/plugins/Ui/qsui/qsuitabbar.h
+++ b/src/plugins/Ui/qsui/qsuitabbar.h
@@ -30,7 +30,7 @@ class QSUiTabBar : public QTabBar
 {
     Q_OBJECT
 public:
-    explicit QSUiTabBar(QWidget *parent = 0);
+    explicit QSUiTabBar(QWidget *parent = nullptr);
 
 private:
     void mouseReleaseEvent(QMouseEvent *e);
diff --git a/src/plugins/Ui/qsui/qsuitabwidget.cpp b/src/plugins/Ui/qsui/qsuitabwidget.cpp
index 3e4b56456..19f2e78e4 100644
--- a/src/plugins/Ui/qsui/qsuitabwidget.cpp
+++ b/src/plugins/Ui/qsui/qsuitabwidget.cpp
@@ -42,8 +42,8 @@ QSUiTabWidget::QSUiTabWidget(QWidget *parent) : QWidget(parent)
 
     setFocusPolicy(Qt::TabFocus);
     setFocusProxy(m_tabBar);
-    m_rightCornerWidget = 0;
-    m_leftCornerWidget = 0;
+    m_rightCornerWidget = nullptr;
+    m_leftCornerWidget = nullptr;
 
     m_menu = new QMenu(this);
     m_group = new QActionGroup(this);
@@ -184,9 +184,9 @@ void QSUiTabWidget::initStyleOption(QStyleOptionTabWidgetFrame *option) const
         return;
 
     option->initFrom(this);
-    option->lineWidth = style()->pixelMetric(QStyle::PM_DefaultFrameWidth, 0, this);
+    option->lineWidth = style()->pixelMetric(QStyle::PM_DefaultFrameWidth, nullptr, this);
 
-    int exth = style()->pixelMetric(QStyle::PM_TabBarBaseHeight, 0, this);
+    int exth = style()->pixelMetric(QStyle::PM_TabBarBaseHeight, nullptr, this);
     QSize t(0, 0);
     if (m_tabBar->isVisibleTo(const_cast<QSUiTabWidget *>(this)))
         t = m_tabBar->sizeHint();
@@ -328,7 +328,7 @@ void QSUiTabWidget::tabRemoved(int index)
 void QSUiTabWidget::mousePressEvent(QMouseEvent *e)
 {
     if((e->button() == Qt::MidButton) &&
-            (childAt(e->pos()) == 0))
+            (childAt(e->pos()) == nullptr))
     {
         e->accept();
         emit createPlayListRequested();
@@ -339,7 +339,7 @@ void QSUiTabWidget::mousePressEvent(QMouseEvent *e)
 void QSUiTabWidget::mouseDoubleClickEvent(QMouseEvent *e)
 {
     if((e->button() == Qt::LeftButton) &&
-            (childAt(e->pos()) == 0))
+            (childAt(e->pos()) == nullptr))
     {
         e->accept();
         emit createPlayListRequested();
diff --git a/src/plugins/Ui/qsui/qsuitabwidget.h b/src/plugins/Ui/qsui/qsuitabwidget.h
index 64f03b197..85988e7a4 100644
--- a/src/plugins/Ui/qsui/qsuitabwidget.h
+++ b/src/plugins/Ui/qsui/qsuitabwidget.h
@@ -35,7 +35,7 @@ class QSUiTabWidget : public QWidget
 {
     Q_OBJECT
 public:
-    QSUiTabWidget(QWidget *parent = 0);
+    QSUiTabWidget(QWidget *parent = nullptr);
 
     QSUiTabBar *tabBar() const;
     ListWidget *listWidget() const;
diff --git a/src/plugins/Ui/qsui/shortcutdialog.h b/src/plugins/Ui/qsui/shortcutdialog.h
index 92c549ac7..5d9a13469 100644
--- a/src/plugins/Ui/qsui/shortcutdialog.h
+++ b/src/plugins/Ui/qsui/shortcutdialog.h
@@ -32,7 +32,7 @@ class ShortcutDialog : public QDialog
 {
     Q_OBJECT
 public:
-    ShortcutDialog(const QString &key, QWidget *parent = 0);
+    ShortcutDialog(const QString &key, QWidget *parent = nullptr);
 
     ~ShortcutDialog();
 
diff --git a/src/plugins/Ui/qsui/visualmenu.cpp b/src/plugins/Ui/qsui/visualmenu.cpp
index 6548a642f..0defc96fe 100644
--- a/src/plugins/Ui/qsui/visualmenu.cpp
+++ b/src/plugins/Ui/qsui/visualmenu.cpp
@@ -26,7 +26,7 @@
 
 VisualMenu::VisualMenu(QWidget *parent) : QMenu(tr("Visualization"), parent)
 {
-    VisualFactory *factory = 0;
+    VisualFactory *factory = nullptr;
     foreach(factory, Visual::factories())
     {
         VisualAction *act = new VisualAction(factory, this);
diff --git a/src/plugins/Ui/qsui/visualmenu.h b/src/plugins/Ui/qsui/visualmenu.h
index 301ce4e4e..2994e40dd 100644
--- a/src/plugins/Ui/qsui/visualmenu.h
+++ b/src/plugins/Ui/qsui/visualmenu.h
@@ -32,7 +32,7 @@ class VisualMenu : public QMenu
 {
     Q_OBJECT
 public:
-    VisualMenu(QWidget *parent = 0);
+    VisualMenu(QWidget *parent = nullptr);
 
     ~VisualMenu();
 
@@ -44,7 +44,7 @@ class VisualAction : public QAction
 {
     Q_OBJECT
 public:
-    VisualAction(VisualFactory *factory, QWidget *parent = 0);
+    VisualAction(VisualFactory *factory, QWidget *parent = nullptr);
 
 private slots:
     void select(bool);
diff --git a/src/plugins/Ui/qsui/volumeslider.h b/src/plugins/Ui/qsui/volumeslider.h
index ea3f9a7e2..344c08000 100644
--- a/src/plugins/Ui/qsui/volumeslider.h
+++ b/src/plugins/Ui/qsui/volumeslider.h
@@ -33,7 +33,7 @@ class VolumeSlider : public QSlider
 {
     Q_OBJECT
 public:
-    explicit VolumeSlider(QWidget *parent = 0);
+    explicit VolumeSlider(QWidget *parent = nullptr);
     virtual ~VolumeSlider(){}
 
 protected:
diff --git a/src/plugins/Ui/skinned/actionmanager.cpp b/src/plugins/Ui/skinned/actionmanager.cpp
index b88206aba..02158089c 100644
--- a/src/plugins/Ui/skinned/actionmanager.cpp
+++ b/src/plugins/Ui/skinned/actionmanager.cpp
@@ -26,7 +26,7 @@
 #include <qmmp/qmmp.h>
 #include "actionmanager.h"
 
-ActionManager *ActionManager::m_instance = 0;
+ActionManager *ActionManager::m_instance = nullptr;
 
 ActionManager::ActionManager(QObject *parent) :
     QObject(parent)
@@ -104,14 +104,14 @@ ActionManager::ActionManager(QObject *parent) :
     m_settings->endGroup();
     readStates();
     delete m_settings;
-    m_settings = 0;
+    m_settings = nullptr;
     m_actions[ABOUT]->setIcon(qApp->windowIcon());
 }
 
 ActionManager::~ActionManager()
 {
     saveStates();
-    m_instance = 0;
+    m_instance = nullptr;
 }
 
 QAction *ActionManager::action(int type)
diff --git a/src/plugins/Ui/skinned/actionmanager.h b/src/plugins/Ui/skinned/actionmanager.h
index bbe9a1f95..d4d0f18f0 100644
--- a/src/plugins/Ui/skinned/actionmanager.h
+++ b/src/plugins/Ui/skinned/actionmanager.h
@@ -38,7 +38,7 @@ class ActionManager : public QObject
 {
     Q_OBJECT
 public:
-    explicit ActionManager(QObject *parent = 0);
+    explicit ActionManager(QObject *parent = nullptr);
     ~ActionManager();
 
     enum Type
diff --git a/src/plugins/Ui/skinned/balancebar.h b/src/plugins/Ui/skinned/balancebar.h
index 50d7b7397..23628163f 100644
--- a/src/plugins/Ui/skinned/balancebar.h
+++ b/src/plugins/Ui/skinned/balancebar.h
@@ -31,7 +31,7 @@ class BalanceBar : public PixmapWidget
 {
 Q_OBJECT
 public:
-    BalanceBar(QWidget *parent = 0);
+    BalanceBar(QWidget *parent = nullptr);
 
     ~BalanceBar();
 
diff --git a/src/plugins/Ui/skinned/display.h b/src/plugins/Ui/skinned/display.h
index 95781eb94..796630bb8 100644
--- a/src/plugins/Ui/skinned/display.h
+++ b/src/plugins/Ui/skinned/display.h
@@ -51,7 +51,7 @@ class MainDisplay : public PixmapWidget
 {
     Q_OBJECT
 public:
-    MainDisplay(MainWindow *parent = 0);
+    MainDisplay(MainWindow *parent = nullptr);
 
     ~MainDisplay();
 
diff --git a/src/plugins/Ui/skinned/dock.cpp b/src/plugins/Ui/skinned/dock.cpp
index 09249be58..0cd867493 100644
--- a/src/plugins/Ui/skinned/dock.cpp
+++ b/src/plugins/Ui/skinned/dock.cpp
@@ -25,7 +25,7 @@
 #include <QApplication>
 #include "dock.h"
 
-Dock *Dock::m_instance = 0;
+Dock *Dock::m_instance = nullptr;
 
 Dock *Dock::instance()
 {
@@ -38,12 +38,12 @@ Dock::Dock (QObject *parent)
         : QObject (parent)
 {
     m_instance = this;
-    m_mainWidget = 0;
+    m_mainWidget = nullptr;
 }
 
 Dock::~Dock()
 {
-    m_instance = 0;
+    m_instance = nullptr;
 }
 
 void Dock::setMainWidget (QWidget *widget)
diff --git a/src/plugins/Ui/skinned/dock.h b/src/plugins/Ui/skinned/dock.h
index 74a64c9fa..e8e39fc16 100644
--- a/src/plugins/Ui/skinned/dock.h
+++ b/src/plugins/Ui/skinned/dock.h
@@ -32,7 +32,7 @@ class Dock : public QObject
 {
     Q_OBJECT
 public:
-    Dock(QObject *parent = 0);
+    Dock(QObject *parent = nullptr);
 
     ~Dock();
 
diff --git a/src/plugins/Ui/skinned/eqgraph.h b/src/plugins/Ui/skinned/eqgraph.h
index 898575af0..6373243ba 100644
--- a/src/plugins/Ui/skinned/eqgraph.h
+++ b/src/plugins/Ui/skinned/eqgraph.h
@@ -30,7 +30,7 @@ class EQGraph : public PixmapWidget
 {
    Q_OBJECT
 public:
-    EQGraph (QWidget *parent = 0);
+    EQGraph (QWidget *parent = nullptr);
 
    ~EQGraph();
 
diff --git a/src/plugins/Ui/skinned/eqslider.h b/src/plugins/Ui/skinned/eqslider.h
index 70873d3c1..eb1d53116 100644
--- a/src/plugins/Ui/skinned/eqslider.h
+++ b/src/plugins/Ui/skinned/eqslider.h
@@ -33,7 +33,7 @@ class EqSlider : public PixmapWidget
 {
 Q_OBJECT
 public:
-    EqSlider(QWidget *parent = 0);
+    EqSlider(QWidget *parent = nullptr);
 
     ~EqSlider();
 
diff --git a/src/plugins/Ui/skinned/eqtitlebar.cpp b/src/plugins/Ui/skinned/eqtitlebar.cpp
index 17a3b3b2f..a6d202bfe 100644
--- a/src/plugins/Ui/skinned/eqtitlebar.cpp
+++ b/src/plugins/Ui/skinned/eqtitlebar.cpp
@@ -32,9 +32,9 @@
 EqTitleBar::EqTitleBar(QWidget *parent)
         : PixmapWidget(parent)
 {
-    m_volumeBar = 0;
-    m_balanceBar = 0;
-    m_shade2 = 0;
+    m_volumeBar = nullptr;
+    m_balanceBar = nullptr;
+    m_shade2 = nullptr;
     m_left = 0;
     m_right = 0;
     m_shaded = false;
@@ -159,9 +159,9 @@ void EqTitleBar::shade()
         m_shade2->deleteLater();
         m_volumeBar->deleteLater();
         m_balanceBar->deleteLater();
-        m_volumeBar = 0;
-        m_balanceBar = 0;
-        m_shade2 = 0;
+        m_volumeBar = nullptr;
+        m_balanceBar = nullptr;
+        m_shade2 = nullptr;
         m_shade->show();
     }
     qobject_cast<EqWidget *>(m_eq)->setMimimalMode(m_shaded);
diff --git a/src/plugins/Ui/skinned/eqtitlebar.h b/src/plugins/Ui/skinned/eqtitlebar.h
index 2c4e01f7b..1db1af2ab 100644
--- a/src/plugins/Ui/skinned/eqtitlebar.h
+++ b/src/plugins/Ui/skinned/eqtitlebar.h
@@ -35,7 +35,7 @@ class EqTitleBar : public PixmapWidget
 {
 Q_OBJECT
 public:
-    EqTitleBar(QWidget *parent = 0);
+    EqTitleBar(QWidget *parent = nullptr);
 
     ~EqTitleBar();
 
diff --git a/src/plugins/Ui/skinned/eqwidget.cpp b/src/plugins/Ui/skinned/eqwidget.cpp
index 46765c67f..f9cabdfc1 100644
--- a/src/plugins/Ui/skinned/eqwidget.cpp
+++ b/src/plugins/Ui/skinned/eqwidget.cpp
@@ -396,7 +396,7 @@ EQPreset *EqWidget::findPreset(const QString &name)
         if (preset->text() == name)
             return preset;
     }
-    return 0;
+    return nullptr;
 }
 
 void EqWidget::importWinampEQF()
diff --git a/src/plugins/Ui/skinned/eqwidget.h b/src/plugins/Ui/skinned/eqwidget.h
index 43783df6a..b05c608b4 100644
--- a/src/plugins/Ui/skinned/eqwidget.h
+++ b/src/plugins/Ui/skinned/eqwidget.h
@@ -42,7 +42,7 @@ class EqWidget : public PixmapWidget
 {
     Q_OBJECT
 public:
-    EqWidget(QWidget *parent = 0);
+    EqWidget(QWidget *parent = nullptr);
 
     ~EqWidget();
 
diff --git a/src/plugins/Ui/skinned/horizontalslider.h b/src/plugins/Ui/skinned/horizontalslider.h
index 7ccaeacf8..19ddfae8d 100644
--- a/src/plugins/Ui/skinned/horizontalslider.h
+++ b/src/plugins/Ui/skinned/horizontalslider.h
@@ -32,7 +32,7 @@ class HorizontalSlider : public QWidget
 {
 Q_OBJECT
 public:
-    HorizontalSlider(QWidget *parent = 0);
+    HorizontalSlider(QWidget *parent = nullptr);
 
     ~HorizontalSlider();
 
diff --git a/src/plugins/Ui/skinned/hotkeyeditor.h b/src/plugins/Ui/skinned/hotkeyeditor.h
index 91fe490a0..786e4d7f7 100644
--- a/src/plugins/Ui/skinned/hotkeyeditor.h
+++ b/src/plugins/Ui/skinned/hotkeyeditor.h
@@ -35,7 +35,7 @@ class HotkeyEditor : public QWidget
     Q_OBJECT
 
 public:
-    explicit HotkeyEditor(QWidget *parent = 0);
+    explicit HotkeyEditor(QWidget *parent = nullptr);
     virtual ~HotkeyEditor();
 
 private slots:
diff --git a/src/plugins/Ui/skinned/listwidget.cpp b/src/plugins/Ui/skinned/listwidget.cpp
index 264273568..dc2c2d41d 100644
--- a/src/plugins/Ui/skinned/listwidget.cpp
+++ b/src/plugins/Ui/skinned/listwidget.cpp
@@ -46,7 +46,7 @@
 ListWidget::ListWidget(QWidget *parent)
         : QWidget(parent)
 {
-    m_popupWidget = 0;
+    m_popupWidget = nullptr;
 
     m_skin = Skin::instance();
     m_ui_settings = QmmpUiSettings::instance();
@@ -65,7 +65,7 @@ ListWidget::ListWidget(QWidget *parent)
     m_first = 0;
     m_row_count = 0;
     m_count = 0;
-    m_firstItem = 0;
+    m_firstItem = nullptr;
     m_select_on_release = false;
 
     setAcceptDrops(true);
@@ -104,7 +104,7 @@ void ListWidget::readSettings()
         if(m_popupWidget)
         {
             m_popupWidget->deleteLater();
-            m_popupWidget = 0;
+            m_popupWidget = nullptr;
         }
     }
     else
@@ -340,7 +340,7 @@ void ListWidget::updateList(int flags)
             emit positionChanged(m_first, m_model->count() - m_row_count);
         }
 
-        m_firstItem = m_model->isEmpty() ? 0 : m_model->item(m_first);
+        m_firstItem = m_model->isEmpty() ? nullptr : m_model->item(m_first);
         m_count = m_model->count();
         items = m_model->mid(m_first, m_row_count);
 
@@ -459,13 +459,13 @@ void ListWidget::setModel(PlayListModel *selected, PlayListModel *previous)
     if(previous)
     {
         previous->setProperty("first_visible", m_first);
-        disconnect(previous, 0, this, 0); //disconnect previous model
-        disconnect(previous,0,m_header,0);
+        disconnect(previous, nullptr, this, nullptr); //disconnect previous model
+        disconnect(previous,nullptr,m_header,nullptr);
     }
     qApp->processEvents();
     m_model = selected;
     m_count = m_model->count();
-    m_firstItem = 0;
+    m_firstItem = nullptr;
 
     if(m_model->property("first_visible").isValid())
     {
diff --git a/src/plugins/Ui/skinned/listwidget.h b/src/plugins/Ui/skinned/listwidget.h
index abaa5fec8..9f4b95bc7 100644
--- a/src/plugins/Ui/skinned/listwidget.h
+++ b/src/plugins/Ui/skinned/listwidget.h
@@ -48,7 +48,7 @@ class ListWidget : public QWidget
 {
     Q_OBJECT
 public:
-    ListWidget(QWidget *parent = 0);
+    ListWidget(QWidget *parent = nullptr);
 
     ~ListWidget();
 
@@ -70,7 +70,7 @@ public slots:
     void readSettings();
     void updateList(int flags);
     void setViewPosition(int sc);
-    void setModel(PlayListModel *selected, PlayListModel *previous = 0);
+    void setModel(PlayListModel *selected, PlayListModel *previous = nullptr);
 
 signals:
     void doubleClicked();
diff --git a/src/plugins/Ui/skinned/listwidgetdrawer.cpp b/src/plugins/Ui/skinned/listwidgetdrawer.cpp
index 0418f9938..7293dc8a0 100644
--- a/src/plugins/Ui/skinned/listwidgetdrawer.cpp
+++ b/src/plugins/Ui/skinned/listwidgetdrawer.cpp
@@ -41,8 +41,8 @@ ListWidgetDrawer::ListWidgetDrawer()
     m_show_splitters = false;
     m_alternate_splitter_color = false;
     m_padding = 0;
-    m_metrics = 0;
-    m_extra_metrics = 0;
+    m_metrics = nullptr;
+    m_extra_metrics = nullptr;
     readSettings();
     loadColors();
 }
diff --git a/src/plugins/Ui/skinned/mainvisual.cpp b/src/plugins/Ui/skinned/mainvisual.cpp
index 4b71c660f..05b2855c9 100644
--- a/src/plugins/Ui/skinned/mainvisual.cpp
+++ b/src/plugins/Ui/skinned/mainvisual.cpp
@@ -31,7 +31,7 @@
 #include "inlines.h"
 #include "mainvisual.h"
 
-MainVisual *MainVisual::m_instance = 0;
+MainVisual *MainVisual::m_instance = nullptr;
 
 MainVisual *MainVisual::instance()
 {
@@ -40,7 +40,7 @@ MainVisual *MainVisual::instance()
     return m_instance;
 }
 
-MainVisual::MainVisual (QWidget *parent) : Visual (parent), m_vis (0)
+MainVisual::MainVisual (QWidget *parent) : Visual (parent), m_vis (nullptr)
 {
     m_skin = Skin::instance();
     m_ratio = m_skin->ratio();
@@ -60,9 +60,9 @@ MainVisual::~MainVisual()
     if (m_vis)
     {
         delete m_vis;
-        m_vis = 0;
+        m_vis = nullptr;
     }
-    m_instance = 0;
+    m_instance = nullptr;
 }
 
 void MainVisual::setVisual (VisualBase *newvis)
@@ -129,7 +129,7 @@ void MainVisual::mousePressEvent (QMouseEvent *e)
         else if (m_vis->name() == "Analyzer")
             setVisual(new mainvisual::Scope);
         else if (m_vis->name() == "Scope")
-            setVisual(0);
+            setVisual(nullptr);
 
         QString str = m_vis ? m_vis->name() : "Off";
         foreach(QAction *act, m_visModeGroup->actions ())
@@ -358,7 +358,7 @@ void MainVisual::readSettings()
     else if (vis_name == "Scope")
         setVisual(new mainvisual::Scope);
     else
-        setVisual(0);
+        setVisual(nullptr);
     resize(76 * m_ratio, 16 * m_ratio);
     update();
 }
@@ -395,7 +395,7 @@ void Analyzer::clear()
 
 bool Analyzer::process (float *l)
 {
-    static fft_state *state = 0;
+    static fft_state *state = nullptr;
     if (!state)
         state = fft_init();
     short dest[256];
diff --git a/src/plugins/Ui/skinned/mainvisual.h b/src/plugins/Ui/skinned/mainvisual.h
index 8ae0b0995..e5b5e300e 100644
--- a/src/plugins/Ui/skinned/mainvisual.h
+++ b/src/plugins/Ui/skinned/mainvisual.h
@@ -45,7 +45,7 @@ class MainVisual : public Visual
     Q_OBJECT
 
 public:
-    MainVisual(QWidget *parent = 0);
+    MainVisual(QWidget *parent = nullptr);
     virtual ~MainVisual();
 
     static MainVisual *instance();
diff --git a/src/plugins/Ui/skinned/mainwindow.cpp b/src/plugins/Ui/skinned/mainwindow.cpp
index f12109a17..2074bdc9b 100644
--- a/src/plugins/Ui/skinned/mainwindow.cpp
+++ b/src/plugins/Ui/skinned/mainwindow.cpp
@@ -58,7 +58,7 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
 #ifdef QMMP_WS_X11
     qDebug("MainWindow: detected wm: %s", qPrintable(WindowSystem::netWindowManagerName()));
 #endif
-    m_vis = 0;
+    m_vis = nullptr;
     m_update = false;
 
 #ifdef QMMP_WS_X11
diff --git a/src/plugins/Ui/skinned/mainwindow.h b/src/plugins/Ui/skinned/mainwindow.h
index db8c684c7..cf4f1bb9b 100644
--- a/src/plugins/Ui/skinned/mainwindow.h
+++ b/src/plugins/Ui/skinned/mainwindow.h
@@ -50,7 +50,7 @@ class MainWindow : public QMainWindow
 {
     Q_OBJECT
 public:
-    MainWindow(QWidget *parent = 0);
+    MainWindow(QWidget *parent = nullptr);
 
     ~MainWindow();
 
diff --git a/src/plugins/Ui/skinned/monostereo.h b/src/plugins/Ui/skinned/monostereo.h
index 8779ca741..b038a4759 100644
--- a/src/plugins/Ui/skinned/monostereo.h
+++ b/src/plugins/Ui/skinned/monostereo.h
@@ -31,7 +31,7 @@ class MonoStereo : public PixmapWidget
 {
 Q_OBJECT
 public:
-    MonoStereo(QWidget *parent = 0);
+    MonoStereo(QWidget *parent = nullptr);
 
     ~MonoStereo();
 
diff --git a/src/plugins/Ui/skinned/number.h b/src/plugins/Ui/skinned/number.h
index 8b44b790d..5c89406ed 100644
--- a/src/plugins/Ui/skinned/number.h
+++ b/src/plugins/Ui/skinned/number.h
@@ -31,7 +31,7 @@ class Number : public PixmapWidget
 {
 Q_OBJECT
 public:
-    Number(QWidget *parent = 0);
+    Number(QWidget *parent = nullptr);
 
     ~Number();
 
diff --git a/src/plugins/Ui/skinned/pixmapwidget.h b/src/plugins/Ui/skinned/pixmapwidget.h
index 73aff2613..9b37feec7 100644
--- a/src/plugins/Ui/skinned/pixmapwidget.h
+++ b/src/plugins/Ui/skinned/pixmapwidget.h
@@ -31,7 +31,7 @@ class PixmapWidget : public QWidget
 {
 Q_OBJECT
 public:
-    PixmapWidget(QWidget *parent = 0);
+    PixmapWidget(QWidget *parent = nullptr);
 
     virtual ~PixmapWidget();
 
diff --git a/src/plugins/Ui/skinned/playlist.cpp b/src/plugins/Ui/skinned/playlist.cpp
index 67a5b3d93..8f280907e 100644
--- a/src/plugins/Ui/skinned/playlist.cpp
+++ b/src/plugins/Ui/skinned/playlist.cpp
@@ -60,8 +60,8 @@ PlayList::PlayList (PlayListManager *manager, QWidget *parent)
     m_skin = Skin::instance();
     m_ratio = m_skin->ratio();
     m_shaded = false;
-    m_pl_browser = 0;
-    m_pl_selector = 0;
+    m_pl_browser = nullptr;
+    m_pl_selector = nullptr;
 
 #ifdef QMMP_WS_X11
     QString wm_name = WindowSystem::netWindowManagerName();
@@ -455,7 +455,7 @@ void PlayList::readSettings()
             m_pl_selector->deleteLater();
             m_listWidget->menu()->removeAction(m_copySelectedMenu->menuAction());
         }
-        m_pl_selector = 0;
+        m_pl_selector = nullptr;
     }
 
     if (m_update)
@@ -621,7 +621,7 @@ void PlayList::generateCopySelectedMenu()
 
 void PlayList::copySelectedMenuActionTriggered(QAction *action)
 {
-    PlayListModel *targetPlayList = 0;
+    PlayListModel *targetPlayList = nullptr;
     QString actionText=action->text();
     if(action == m_copySelectedMenu->actions().at(0))//actionText == tr ("&New PlayList"))
     {
diff --git a/src/plugins/Ui/skinned/playlist.h b/src/plugins/Ui/skinned/playlist.h
index d960255c7..67570da88 100644
--- a/src/plugins/Ui/skinned/playlist.h
+++ b/src/plugins/Ui/skinned/playlist.h
@@ -49,7 +49,7 @@ class PlayList : public QWidget
 {
         Q_OBJECT
     public:
-        PlayList (PlayListManager *manager, QWidget *parent = 0);
+        PlayList (PlayListManager *manager, QWidget *parent = nullptr);
         virtual ~PlayList();
 
         void readSettings();
diff --git a/src/plugins/Ui/skinned/playlistbrowser.h b/src/plugins/Ui/skinned/playlistbrowser.h
index 65d01155b..5cfe21508 100644
--- a/src/plugins/Ui/skinned/playlistbrowser.h
+++ b/src/plugins/Ui/skinned/playlistbrowser.h
@@ -36,7 +36,7 @@ class PlayListBrowser : public QDialog
 {
 Q_OBJECT
 public:
-    PlayListBrowser(PlayListManager *manager, QWidget *parent = 0);
+    PlayListBrowser(PlayListManager *manager, QWidget *parent = nullptr);
     ~PlayListBrowser();
 
 private slots:
diff --git a/src/plugins/Ui/skinned/playlistcontrol.h b/src/plugins/Ui/skinned/playlistcontrol.h
index 8f85d0344..d661f09a8 100644
--- a/src/plugins/Ui/skinned/playlistcontrol.h
+++ b/src/plugins/Ui/skinned/playlistcontrol.h
@@ -34,7 +34,7 @@ class PlaylistControl : public PixmapWidget
 {
 Q_OBJECT
 public:
-    PlaylistControl(QWidget* parent = 0);
+    PlaylistControl(QWidget* parent = nullptr);
 
 
 signals:
diff --git a/src/plugins/Ui/skinned/playlistheader.cpp b/src/plugins/Ui/skinned/playlistheader.cpp
index 4ad6bac03..442aab3cf 100644
--- a/src/plugins/Ui/skinned/playlistheader.cpp
+++ b/src/plugins/Ui/skinned/playlistheader.cpp
@@ -69,7 +69,7 @@ PlayListHeader::PlayListHeader(QWidget *parent) :
     QWidget(parent)
 {
     setMouseTracking(true);
-    m_metrics = 0;
+    m_metrics = nullptr;
     m_padding = 0;
     m_pl_padding = 0;
     m_number_width = 0;
@@ -118,7 +118,7 @@ PlayListHeader::~PlayListHeader()
 {
     if (m_metrics)
         delete m_metrics;
-    m_metrics = 0;
+    m_metrics = nullptr;
     writeSettings();
 }
 
@@ -131,7 +131,7 @@ void PlayListHeader::readSettings()
     if (m_metrics)
     {
         delete m_metrics;
-        m_metrics = 0;
+        m_metrics = nullptr;
     }
 
     m_metrics = new QFontMetrics(m_font);
diff --git a/src/plugins/Ui/skinned/playlistheader.h b/src/plugins/Ui/skinned/playlistheader.h
index 3f57ee6d0..f5622b955 100644
--- a/src/plugins/Ui/skinned/playlistheader.h
+++ b/src/plugins/Ui/skinned/playlistheader.h
@@ -41,7 +41,7 @@ class PlayListHeader : public QWidget
 {
     Q_OBJECT
 public:
-    explicit PlayListHeader(QWidget *parent = 0);
+    explicit PlayListHeader(QWidget *parent = nullptr);
     ~PlayListHeader();
 
     void readSettings();
diff --git a/src/plugins/Ui/skinned/playlistselector.cpp b/src/plugins/Ui/skinned/playlistselector.cpp
index f0fb9a6b3..37ac13eb5 100644
--- a/src/plugins/Ui/skinned/playlistselector.cpp
+++ b/src/plugins/Ui/skinned/playlistselector.cpp
@@ -40,7 +40,7 @@ PlayListSelector::PlayListSelector(PlayListManager *manager, QWidget *parent) :
     m_moving = false;
     m_offset = 0;
     m_offset_max = 0;
-    m_metrics = 0;
+    m_metrics = nullptr;
     m_pressed_button = BUTTON_UNKNOWN;
     m_skin = Skin::instance();
     m_pl_manager = manager;
@@ -60,7 +60,7 @@ PlayListSelector::~PlayListSelector()
 {
     if (m_metrics)
         delete m_metrics;
-    m_metrics = 0;
+    m_metrics = nullptr;
 }
 
 void PlayListSelector::readSettings()
@@ -70,7 +70,7 @@ void PlayListSelector::readSettings()
     if (m_metrics)
     {
         delete m_metrics;
-        m_metrics = 0;
+        m_metrics = nullptr;
     }
     m_metrics = new QFontMetrics(m_font);
     m_pl_separator = settings.value("Skinned/pl_separator", "::").toString();
diff --git a/src/plugins/Ui/skinned/playlistselector.h b/src/plugins/Ui/skinned/playlistselector.h
index 61a1ca972..63d000e8f 100644
--- a/src/plugins/Ui/skinned/playlistselector.h
+++ b/src/plugins/Ui/skinned/playlistselector.h
@@ -40,7 +40,7 @@ class PlayListSelector : public QWidget
 {
 Q_OBJECT
 public:
-    PlayListSelector(PlayListManager *manager, QWidget *parent = 0);
+    PlayListSelector(PlayListManager *manager, QWidget *parent = nullptr);
     ~PlayListSelector();
     void readSettings();
 
diff --git a/src/plugins/Ui/skinned/playlistslider.h b/src/plugins/Ui/skinned/playlistslider.h
index 9e2172eb2..8e3b267ca 100644
--- a/src/plugins/Ui/skinned/playlistslider.h
+++ b/src/plugins/Ui/skinned/playlistslider.h
@@ -30,7 +30,7 @@ class PlayListSlider : public QWidget
 {
 Q_OBJECT
 public:
-    PlayListSlider(QWidget *parent = 0);
+    PlayListSlider(QWidget *parent = nullptr);
 
     ~PlayListSlider();
 
diff --git a/src/plugins/Ui/skinned/playlisttitlebar.cpp b/src/plugins/Ui/skinned/playlisttitlebar.cpp
index 1c4b3d98f..3450a5bc5 100644
--- a/src/plugins/Ui/skinned/playlisttitlebar.cpp
+++ b/src/plugins/Ui/skinned/playlisttitlebar.cpp
@@ -38,8 +38,8 @@ PlayListTitleBar::PlayListTitleBar(QWidget *parent)
     m_active = false;
     m_resize = false;
     m_formatter.setPattern(TITLE_FORMAT);
-    m_shade2 = 0;
-    m_model = 0;
+    m_shade2 = nullptr;
+    m_model = nullptr;
     m_shaded = false;
     m_align = false;
     m_skin = Skin::instance();
@@ -221,7 +221,7 @@ void PlayListTitleBar::setActive(bool a)
 void PlayListTitleBar::setModel(PlayListModel *selected, PlayListModel *previous)
 {
     if(previous)
-        disconnect(previous, 0, this, 0); //disconnect previous model
+        disconnect(previous, nullptr, this, nullptr); //disconnect previous model
     m_model = selected;
     connect (m_model, SIGNAL(listChanged(int)), SLOT(showCurrent()));
     showCurrent();
@@ -262,7 +262,7 @@ void PlayListTitleBar::shade()
     else
     {
         m_shade2->deleteLater();
-        m_shade2 = 0;
+        m_shade2 = nullptr;
         m_shade->show();
     }
     m_pl->setMinimalMode(m_shaded);
diff --git a/src/plugins/Ui/skinned/playlisttitlebar.h b/src/plugins/Ui/skinned/playlisttitlebar.h
index f1de7a3cb..6e2a48cf5 100644
--- a/src/plugins/Ui/skinned/playlisttitlebar.h
+++ b/src/plugins/Ui/skinned/playlisttitlebar.h
@@ -37,14 +37,14 @@ class PlayListTitleBar : public PixmapWidget
 {
 Q_OBJECT
 public:
-    PlayListTitleBar(QWidget *parent = 0);
+    PlayListTitleBar(QWidget *parent = nullptr);
     ~PlayListTitleBar();
     void setActive(bool);
     void readSettings();
 
 public slots:
     void showCurrent();
-    void setModel(PlayListModel *selected, PlayListModel *previous = 0);
+    void setModel(PlayListModel *selected, PlayListModel *previous = nullptr);
 
 private slots:
     void updateSkin();
diff --git a/src/plugins/Ui/skinned/playstatus.h b/src/plugins/Ui/skinned/playstatus.h
index 819568fa4..85deb480e 100644
--- a/src/plugins/Ui/skinned/playstatus.h
+++ b/src/plugins/Ui/skinned/playstatus.h
@@ -31,7 +31,7 @@ class PlayStatus : public PixmapWidget
 {
 Q_OBJECT
 public:
-    PlayStatus(QWidget *parent = 0);
+    PlayStatus(QWidget *parent = nullptr);
 
     ~PlayStatus();
 
diff --git a/src/plugins/Ui/skinned/popupsettings.h b/src/plugins/Ui/skinned/popupsettings.h
index c669629e4..b79f1609b 100644
--- a/src/plugins/Ui/skinned/popupsettings.h
+++ b/src/plugins/Ui/skinned/popupsettings.h
@@ -30,7 +30,7 @@ class PopupSettings : public QDialog
 {
 Q_OBJECT
 public:
-    PopupSettings(QWidget *parent = 0);
+    PopupSettings(QWidget *parent = nullptr);
     ~PopupSettings();
 
 public slots:
diff --git a/src/plugins/Ui/skinned/popupwidget.h b/src/plugins/Ui/skinned/popupwidget.h
index fd855dfec..84d00d4f4 100644
--- a/src/plugins/Ui/skinned/popupwidget.h
+++ b/src/plugins/Ui/skinned/popupwidget.h
@@ -37,7 +37,7 @@ class PopupWidget : public QWidget
 {
     Q_OBJECT
 public:
-    PopupWidget(QWidget *parent = 0);
+    PopupWidget(QWidget *parent = nullptr);
 
     ~PopupWidget();
 
diff --git a/src/plugins/Ui/skinned/positionbar.h b/src/plugins/Ui/skinned/positionbar.h
index bf16c83d6..2b0261fb9 100644
--- a/src/plugins/Ui/skinned/positionbar.h
+++ b/src/plugins/Ui/skinned/positionbar.h
@@ -33,7 +33,7 @@ class PositionBar : public PixmapWidget
 {
     Q_OBJECT
 public:
-    PositionBar(QWidget *parent = 0);
+    PositionBar(QWidget *parent = nullptr);
     virtual ~PositionBar();
 
 public slots:
diff --git a/src/plugins/Ui/skinned/preseteditor.cpp b/src/plugins/Ui/skinned/preseteditor.cpp
index 0d241b603..87e29f869 100644
--- a/src/plugins/Ui/skinned/preseteditor.cpp
+++ b/src/plugins/Ui/skinned/preseteditor.cpp
@@ -61,7 +61,7 @@ void PresetEditor::addAutoPresets(const QList<EQPreset*> &presets)
 
 void PresetEditor::loadPreset()
 {
-    EQPreset* preset = 0;
+    EQPreset* preset = nullptr;
     if (ui.tabWidget->currentIndex () == 0)
         preset = (EQPreset *) ui.presetListWidget->currentItem ();
     if (ui.tabWidget->currentIndex () == 1)
@@ -72,7 +72,7 @@ void PresetEditor::loadPreset()
 
 void PresetEditor::deletePreset()
 {
-    EQPreset* preset = 0;
+    EQPreset* preset = nullptr;
     if (ui.tabWidget->currentIndex () == 0)
         preset = (EQPreset *) ui.presetListWidget->currentItem ();
     if (ui.tabWidget->currentIndex () == 1)
diff --git a/src/plugins/Ui/skinned/preseteditor.h b/src/plugins/Ui/skinned/preseteditor.h
index b77932ce3..842122506 100644
--- a/src/plugins/Ui/skinned/preseteditor.h
+++ b/src/plugins/Ui/skinned/preseteditor.h
@@ -34,7 +34,7 @@ class PresetEditor : public QDialog
 {
 Q_OBJECT
 public:
-    PresetEditor(QWidget *parent = 0);
+    PresetEditor(QWidget *parent = nullptr);
 
     ~PresetEditor();
 
diff --git a/src/plugins/Ui/skinned/shadedbar.h b/src/plugins/Ui/skinned/shadedbar.h
index f5e3a9d8d..1a5f96fd3 100644
--- a/src/plugins/Ui/skinned/shadedbar.h
+++ b/src/plugins/Ui/skinned/shadedbar.h
@@ -33,7 +33,7 @@ class ShadedBar : public QWidget
 {
     Q_OBJECT
 public:
-    ShadedBar(QWidget *parent = 0, uint slider1 = 0, uint slider2 = 0, uint slider3 = 0);
+    ShadedBar(QWidget *parent = nullptr, uint slider1 = 0, uint slider2 = 0, uint slider3 = 0);
 
     ~ShadedBar();
     int value()
diff --git a/src/plugins/Ui/skinned/shadedvisual.h b/src/plugins/Ui/skinned/shadedvisual.h
index 04b92b671..a74c6f693 100644
--- a/src/plugins/Ui/skinned/shadedvisual.h
+++ b/src/plugins/Ui/skinned/shadedvisual.h
@@ -35,7 +35,7 @@ class ShadedVisual : public Visual
 {
     Q_OBJECT
 public:
-    ShadedVisual(QWidget *parent = 0);
+    ShadedVisual(QWidget *parent = nullptr);
 
     ~ShadedVisual();
 
diff --git a/src/plugins/Ui/skinned/shortcutdialog.h b/src/plugins/Ui/skinned/shortcutdialog.h
index 92c549ac7..5d9a13469 100644
--- a/src/plugins/Ui/skinned/shortcutdialog.h
+++ b/src/plugins/Ui/skinned/shortcutdialog.h
@@ -32,7 +32,7 @@ class ShortcutDialog : public QDialog
 {
     Q_OBJECT
 public:
-    ShortcutDialog(const QString &key, QWidget *parent = 0);
+    ShortcutDialog(const QString &key, QWidget *parent = nullptr);
 
     ~ShortcutDialog();
 
diff --git a/src/plugins/Ui/skinned/skin.cpp b/src/plugins/Ui/skinned/skin.cpp
index fa38278fe..cc619a7bc 100644
--- a/src/plugins/Ui/skinned/skin.cpp
+++ b/src/plugins/Ui/skinned/skin.cpp
@@ -37,7 +37,7 @@
 #include "skin.h"
 #include "cursorimage.h"
 
-Skin *Skin::m_instance = 0;
+Skin *Skin::m_instance = nullptr;
 
 Skin *Skin::instance()
 {
@@ -858,7 +858,7 @@ QPixmap * Skin::getDummyPixmap(const QString &name, const QString &fallback)
     }
 
     qFatal("Skin: default skin is corrupted");
-    return 0;
+    return nullptr;
 }
 
 QPixmap Skin::scalePixmap(const QPixmap &pix, int ratio)
diff --git a/src/plugins/Ui/skinned/skin.h b/src/plugins/Ui/skinned/skin.h
index 6a6509aa3..3077f2f07 100644
--- a/src/plugins/Ui/skinned/skin.h
+++ b/src/plugins/Ui/skinned/skin.h
@@ -35,7 +35,7 @@ class Skin : public QObject
 {
     Q_OBJECT
 public:
-    Skin(QObject *parent = 0);
+    Skin(QObject *parent = nullptr);
 
     ~Skin();
 
diff --git a/src/plugins/Ui/skinned/skinnedsettings.h b/src/plugins/Ui/skinned/skinnedsettings.h
index ec8e30467..4f2c0c757 100644
--- a/src/plugins/Ui/skinned/skinnedsettings.h
+++ b/src/plugins/Ui/skinned/skinnedsettings.h
@@ -32,7 +32,7 @@ class SkinnedSettings : public QWidget
 {
     Q_OBJECT
 public:
-    explicit SkinnedSettings(QWidget *parent = 0);
+    explicit SkinnedSettings(QWidget *parent = nullptr);
     virtual ~SkinnedSettings();
     void writeSettings();
 
diff --git a/src/plugins/Ui/skinned/skinreader.h b/src/plugins/Ui/skinned/skinreader.h
index ce76075f2..cebda0cb7 100644
--- a/src/plugins/Ui/skinned/skinreader.h
+++ b/src/plugins/Ui/skinned/skinreader.h
@@ -33,7 +33,7 @@ class SkinReader : public QObject
 {
     Q_OBJECT
 public:
-    SkinReader(QObject *parent = 0);
+    SkinReader(QObject *parent = nullptr);
 
     ~SkinReader();
 
diff --git a/src/plugins/Ui/skinned/symboldisplay.h b/src/plugins/Ui/skinned/symboldisplay.h
index 50761d08c..4f232ae01 100644
--- a/src/plugins/Ui/skinned/symboldisplay.h
+++ b/src/plugins/Ui/skinned/symboldisplay.h
@@ -32,7 +32,7 @@ class SymbolDisplay : public PixmapWidget
 {
     Q_OBJECT
 public:
-    SymbolDisplay(QWidget *parent = 0, int digits = 3);
+    SymbolDisplay(QWidget *parent = nullptr, int digits = 3);
 
     virtual ~SymbolDisplay();
 
diff --git a/src/plugins/Ui/skinned/textscroller.cpp b/src/plugins/Ui/skinned/textscroller.cpp
index 078455588..9167cc0fa 100644
--- a/src/plugins/Ui/skinned/textscroller.cpp
+++ b/src/plugins/Ui/skinned/textscroller.cpp
@@ -42,7 +42,7 @@ TextScroller::TextScroller (QWidget *parent) : QWidget (parent)
 {
     m_pressed = false;
     m_press_pos = 0;
-    m_metrics = 0;
+    m_metrics = nullptr;
     m_defautText = QString("Qmmp ") + Qmmp::strVersion();
     m_formater.setPattern(TITLE_FORMAT);
     m_core = SoundCore::instance();
@@ -234,14 +234,14 @@ void TextScroller::processState(Qmmp::State state)
     }
     case Qmmp::Playing:
     {
-        disconnect(m_core, SIGNAL(bufferingProgress(int)), this, 0);
+        disconnect(m_core, SIGNAL(bufferingProgress(int)), this, nullptr);
         m_bufferText.clear();
         updateText();
         break;
     }
     case Qmmp::Stopped:
     {
-        disconnect(m_core, SIGNAL(bufferingProgress(int)), this, 0);
+        disconnect(m_core, SIGNAL(bufferingProgress(int)), this, nullptr);
         break;
     }
     default:
diff --git a/src/plugins/Ui/skinned/textscroller.h b/src/plugins/Ui/skinned/textscroller.h
index 5dbf523be..2785b18ba 100644
--- a/src/plugins/Ui/skinned/textscroller.h
+++ b/src/plugins/Ui/skinned/textscroller.h
@@ -37,7 +37,7 @@ class TextScroller : public QWidget
 {
 Q_OBJECT
 public:
-    TextScroller(QWidget *parent = 0);
+    TextScroller(QWidget *parent = nullptr);
     virtual ~TextScroller();
 
     void setText(const QString &text);
diff --git a/src/plugins/Ui/skinned/timeindicator.h b/src/plugins/Ui/skinned/timeindicator.h
index 7f3721405..82ca728fd 100644
--- a/src/plugins/Ui/skinned/timeindicator.h
+++ b/src/plugins/Ui/skinned/timeindicator.h
@@ -35,7 +35,7 @@ class Skin;
 class TimeIndicatorModel : public QObject {
     Q_OBJECT
 public:
-    TimeIndicatorModel(QObject *parent = 0);
+    TimeIndicatorModel(QObject *parent = nullptr);
     ~TimeIndicatorModel();
 
     int position() { return m_position; }
@@ -77,7 +77,7 @@ class TimeIndicator : public PixmapWidget
 {
     Q_OBJECT
 public:
-    TimeIndicator(TimeIndicatorModel *model, QWidget *parent = 0);
+    TimeIndicator(TimeIndicatorModel *model, QWidget *parent = nullptr);
     ~TimeIndicator();
 
 protected:
diff --git a/src/plugins/Ui/skinned/titlebar.cpp b/src/plugins/Ui/skinned/titlebar.cpp
index 3b0f47a44..81ba910a7 100644
--- a/src/plugins/Ui/skinned/titlebar.cpp
+++ b/src/plugins/Ui/skinned/titlebar.cpp
@@ -45,10 +45,10 @@ TitleBar::TitleBar(TimeIndicatorModel *model, QWidget *parent)
     setPixmap(m_skin->getTitleBar(Skin::TITLEBAR_A));
     m_mw = qobject_cast<MainWindow*>(parent->parent());
     m_shaded = false;
-    m_shade2 = 0;
-    m_currentTime = 0;
-    m_control = 0;
-    m_visual = 0;
+    m_shade2 = nullptr;
+    m_currentTime = nullptr;
+    m_control = nullptr;
+    m_visual = nullptr;
     //buttons
     m_menu = new Button(this,Skin::BT_MENU_N,Skin::BT_MENU_P, Skin::CUR_MAINMENU);
     connect(m_menu,SIGNAL(clicked()),this,SLOT(showMainMenu()));
@@ -184,10 +184,10 @@ void TitleBar::shade()
         m_control->deleteLater();
         Visual::remove(m_visual);
         m_visual->deleteLater();
-        m_shade2 = 0;
-        m_currentTime = 0;
-        m_control = 0;
-        m_visual = 0;
+        m_shade2 = nullptr;
+        m_currentTime = nullptr;
+        m_control = nullptr;
+        m_visual = nullptr;
         m_shade->show();
     }
     qobject_cast<MainDisplay *> (parent())->setMinimalMode(m_shaded);
diff --git a/src/plugins/Ui/skinned/titlebar.h b/src/plugins/Ui/skinned/titlebar.h
index a2c7b98d3..284ee12d1 100644
--- a/src/plugins/Ui/skinned/titlebar.h
+++ b/src/plugins/Ui/skinned/titlebar.h
@@ -42,7 +42,7 @@ class TitleBar : public PixmapWidget
 {
 Q_OBJECT
 public:
-    TitleBar(TimeIndicatorModel *model, QWidget *parent = 0);
+    TitleBar(TimeIndicatorModel *model, QWidget *parent = nullptr);
 
     ~TitleBar();
 
diff --git a/src/plugins/Ui/skinned/titlebarcontrol.h b/src/plugins/Ui/skinned/titlebarcontrol.h
index a2fd5a051..46c3a7975 100644
--- a/src/plugins/Ui/skinned/titlebarcontrol.h
+++ b/src/plugins/Ui/skinned/titlebarcontrol.h
@@ -31,7 +31,7 @@ class TitleBarControl : public QWidget
 {
 Q_OBJECT
 public:
-    TitleBarControl(QWidget *parent = 0);
+    TitleBarControl(QWidget *parent = nullptr);
     ~TitleBarControl();
 
 signals:
diff --git a/src/plugins/Ui/skinned/visualmenu.cpp b/src/plugins/Ui/skinned/visualmenu.cpp
index ba6409c55..cf99d361a 100644
--- a/src/plugins/Ui/skinned/visualmenu.cpp
+++ b/src/plugins/Ui/skinned/visualmenu.cpp
@@ -25,7 +25,7 @@
 
 VisualMenu::VisualMenu(QWidget *parent) : QMenu(tr("Visualization"), parent)
 {
-    VisualFactory *factory = 0;
+    VisualFactory *factory = nullptr;
     foreach(factory, Visual::factories())
     {
         VisualAction *act = new VisualAction(factory, this);
diff --git a/src/plugins/Ui/skinned/visualmenu.h b/src/plugins/Ui/skinned/visualmenu.h
index 301ce4e4e..2994e40dd 100644
--- a/src/plugins/Ui/skinned/visualmenu.h
+++ b/src/plugins/Ui/skinned/visualmenu.h
@@ -32,7 +32,7 @@ class VisualMenu : public QMenu
 {
     Q_OBJECT
 public:
-    VisualMenu(QWidget *parent = 0);
+    VisualMenu(QWidget *parent = nullptr);
 
     ~VisualMenu();
 
@@ -44,7 +44,7 @@ class VisualAction : public QAction
 {
     Q_OBJECT
 public:
-    VisualAction(VisualFactory *factory, QWidget *parent = 0);
+    VisualAction(VisualFactory *factory, QWidget *parent = nullptr);
 
 private slots:
     void select(bool);
diff --git a/src/plugins/Ui/skinned/volumebar.h b/src/plugins/Ui/skinned/volumebar.h
index 96a2315c7..7e8d83ecd 100644
--- a/src/plugins/Ui/skinned/volumebar.h
+++ b/src/plugins/Ui/skinned/volumebar.h
@@ -32,7 +32,7 @@ class VolumeBar : public PixmapWidget
 {
 Q_OBJECT
 public:
-    VolumeBar(QWidget *parent = 0);
+    VolumeBar(QWidget *parent = nullptr);
 
     ~VolumeBar();
 
diff --git a/src/plugins/Visual/analyzer/analyzer.cpp b/src/plugins/Visual/analyzer/analyzer.cpp
index 5a409142b..e8ccf7ccb 100644
--- a/src/plugins/Visual/analyzer/analyzer.cpp
+++ b/src/plugins/Visual/analyzer/analyzer.cpp
@@ -33,9 +33,9 @@
 
 Analyzer::Analyzer (QWidget *parent) : Visual (parent)
 {
-    m_intern_vis_data = 0;
-    m_peaks = 0;
-    m_x_scale = 0;
+    m_intern_vis_data = nullptr;
+    m_peaks = nullptr;
+    m_x_scale = nullptr;
     m_rows = 0;
     m_cols = 0;
     m_update = false;
@@ -202,7 +202,7 @@ void Analyzer::mousePressEvent(QMouseEvent *e)
 
 void Analyzer::process()
 {
-    static fft_state *state = 0;
+    static fft_state *state = nullptr;
     if (!state)
         state = fft_init();
 
diff --git a/src/plugins/Visual/analyzer/analyzer.h b/src/plugins/Visual/analyzer/analyzer.h
index c44e99aee..df090de8b 100644
--- a/src/plugins/Visual/analyzer/analyzer.h
+++ b/src/plugins/Visual/analyzer/analyzer.h
@@ -37,7 +37,7 @@ class Analyzer : public Visual
     Q_OBJECT
 
 public:
-    Analyzer( QWidget *parent = 0);
+    Analyzer( QWidget *parent = nullptr);
     virtual ~Analyzer();
 
 public slots:
diff --git a/src/plugins/Visual/analyzer/colorwidget.h b/src/plugins/Visual/analyzer/colorwidget.h
index 86d915a09..1f8049ef5 100644
--- a/src/plugins/Visual/analyzer/colorwidget.h
+++ b/src/plugins/Visual/analyzer/colorwidget.h
@@ -30,7 +30,7 @@ class ColorWidget : public QFrame
 {
     Q_OBJECT
 public:
-    ColorWidget(QWidget *parent = 0);
+    ColorWidget(QWidget *parent = nullptr);
 
     ~ColorWidget();
 
diff --git a/src/plugins/Visual/analyzer/settingsdialog.h b/src/plugins/Visual/analyzer/settingsdialog.h
index 1ad4e632e..dd2df6cd7 100644
--- a/src/plugins/Visual/analyzer/settingsdialog.h
+++ b/src/plugins/Visual/analyzer/settingsdialog.h
@@ -30,7 +30,7 @@ class SettingsDialog : public QDialog
 {
 Q_OBJECT
 public:
-    SettingsDialog(QWidget *parent = 0);
+    SettingsDialog(QWidget *parent = nullptr);
 
     ~SettingsDialog();
 
diff --git a/src/plugins/Visual/projectm/projectmplugin.h b/src/plugins/Visual/projectm/projectmplugin.h
index 76847a72d..84800f7ca 100644
--- a/src/plugins/Visual/projectm/projectmplugin.h
+++ b/src/plugins/Visual/projectm/projectmplugin.h
@@ -33,7 +33,7 @@ class ProjectMPlugin : public Visual
 {
     Q_OBJECT
 public:
-    ProjectMPlugin(QWidget *parent = 0);
+    ProjectMPlugin(QWidget *parent = nullptr);
     virtual ~ProjectMPlugin();
 
 public slots:
diff --git a/src/plugins/Visual/projectm/projectmwidget.cpp b/src/plugins/Visual/projectm/projectmwidget.cpp
index 95c2ea61d..2f5a87dd6 100644
--- a/src/plugins/Visual/projectm/projectmwidget.cpp
+++ b/src/plugins/Visual/projectm/projectmwidget.cpp
@@ -42,7 +42,7 @@ ProjectMWidget::ProjectMWidget(QListWidget *listWidget, QWidget *parent)
 {
     setMouseTracking(true);
     m_listWidget = listWidget;
-    m_projectM = 0;
+    m_projectM = nullptr;
     m_menu = new QMenu(this);
     connect(SoundCore::instance(), SIGNAL(trackInfoChanged()), SLOT(updateTitle()));
     createActions();
diff --git a/src/plugins/Visual/projectm/projectmwidget.h b/src/plugins/Visual/projectm/projectmwidget.h
index 561aa1658..596180e84 100644
--- a/src/plugins/Visual/projectm/projectmwidget.h
+++ b/src/plugins/Visual/projectm/projectmwidget.h
@@ -35,7 +35,7 @@ class ProjectMWidget : public QOpenGLWidget
 {
     Q_OBJECT
 public:
-    ProjectMWidget(QListWidget *listWidget, QWidget *parent = 0);
+    ProjectMWidget(QListWidget *listWidget, QWidget *parent = nullptr);
 
     ~ProjectMWidget();
 
diff --git a/src/plugins/Visual/projectm/projectmwrapper.h b/src/plugins/Visual/projectm/projectmwrapper.h
index 530ee0fee..95f76f5ea 100644
--- a/src/plugins/Visual/projectm/projectmwrapper.h
+++ b/src/plugins/Visual/projectm/projectmwrapper.h
@@ -28,8 +28,8 @@ class ProjectMWrapper : public QObject, public projectM
 {
     Q_OBJECT
 public:
-    explicit ProjectMWrapper(std::string config_file, int flags, QObject *parent = 0);
-    explicit ProjectMWrapper(Settings settings, int flags, QObject *parent = 0);
+    explicit ProjectMWrapper(std::string config_file, int flags, QObject *parent = nullptr);
+    explicit ProjectMWrapper(Settings settings, int flags, QObject *parent = nullptr);
 
     virtual ~ProjectMWrapper();
 
diff --git a/src/plugins/Visual/projectm/visualprojectmfactory.cpp b/src/plugins/Visual/projectm/visualprojectmfactory.cpp
index 60698c067..e0f092c94 100644
--- a/src/plugins/Visual/projectm/visualprojectmfactory.cpp
+++ b/src/plugins/Visual/projectm/visualprojectmfactory.cpp
@@ -41,7 +41,7 @@ Visual *VisualProjectMFactory::create(QWidget *parent)
 QDialog *VisualProjectMFactory::createConfigDialog(QWidget *parent)
 {
     Q_UNUSED(parent);
-    return 0;
+    return nullptr;
 }
 
 void VisualProjectMFactory::showAbout(QWidget *parent)
diff --git a/src/qmmp/abstractengine.cpp b/src/qmmp/abstractengine.cpp
index fa21cfff0..c1e0ba1ed 100644
--- a/src/qmmp/abstractengine.cpp
+++ b/src/qmmp/abstractengine.cpp
@@ -44,7 +44,7 @@ QMutex *AbstractEngine::mutex()
 
 // static methods
 QStringList AbstractEngine::m_disabledNames;
-QList<QmmpPluginCache*> *AbstractEngine::m_cache = 0;
+QList<QmmpPluginCache*> *AbstractEngine::m_cache = nullptr;
 
 void AbstractEngine::loadPlugins()
 {
@@ -72,7 +72,7 @@ AbstractEngine *AbstractEngine::create(InputSource *s, QObject *parent)
     if(!engine->enqueue(s))
     {
         engine->deleteLater();
-        engine = 0;
+        engine = nullptr;
     }
     else
         return engine;
@@ -91,7 +91,7 @@ AbstractEngine *AbstractEngine::create(InputSource *s, QObject *parent)
         if(!engine->enqueue(s))
         {
             engine->deleteLater();
-            engine = 0;
+            engine = nullptr;
         }
         else
             break;
@@ -136,7 +136,7 @@ EngineFactory *AbstractEngine::findByFilePath(const QString& source)
         if (fact && fact->supports(source))
             return fact;
     }
-    return 0;
+    return nullptr;
 }
 
 void AbstractEngine::setEnabled(EngineFactory *factory, bool enable)
diff --git a/src/qmmp/abstractengine.h b/src/qmmp/abstractengine.h
index c935aa0b3..e32b1a550 100644
--- a/src/qmmp/abstractengine.h
+++ b/src/qmmp/abstractengine.h
@@ -44,7 +44,7 @@ public:
      * Object constructor.
      * @param parent Parent object.
      */
-    AbstractEngine(QObject *parent = 0);
+    AbstractEngine(QObject *parent = nullptr);
     /*!
      * Destructor.
      */
@@ -82,7 +82,7 @@ public:
      * @param parent Parent object.
      * Returns \b 0 if the given source is not supported.
      */
-    static AbstractEngine *create(InputSource *s, QObject *parent = 0);
+    static AbstractEngine *create(InputSource *s, QObject *parent = nullptr);
     /*!
      * Returns a list of engine factories.
      */
diff --git a/src/qmmp/buffer.h b/src/qmmp/buffer.h
index 58c5f0f2c..6e3828173 100644
--- a/src/qmmp/buffer.h
+++ b/src/qmmp/buffer.h
@@ -37,7 +37,7 @@ public:
     ~Buffer()
     {
         delete[] data;
-        data = 0;
+        data = nullptr;
         samples = 0;
         rate = 0;
         size = 0;
diff --git a/src/qmmp/channelconverter.cpp b/src/qmmp/channelconverter.cpp
index 2011987f0..bf00367f4 100644
--- a/src/qmmp/channelconverter.cpp
+++ b/src/qmmp/channelconverter.cpp
@@ -23,7 +23,7 @@
 ChannelConverter::ChannelConverter(ChannelMap out_map)
 {
     m_disabled = true;
-    m_tmp_buf = 0;
+    m_tmp_buf = nullptr;
     m_channels = 0;
     m_out_map = out_map;
     memset(m_reorder_array, 0, sizeof(m_reorder_array));
@@ -34,7 +34,7 @@ ChannelConverter::~ChannelConverter()
     if(m_tmp_buf)
     {
         delete [] m_tmp_buf;
-        m_tmp_buf = 0;
+        m_tmp_buf = nullptr;
     }
 }
 
diff --git a/src/qmmp/decoder.cpp b/src/qmmp/decoder.cpp
index f0139e3dd..e7cd5c4b1 100644
--- a/src/qmmp/decoder.cpp
+++ b/src/qmmp/decoder.cpp
@@ -115,7 +115,7 @@ const QMap<Qmmp::TrackProperty, QString> &Decoder::properties() const
 
 // static methods
 QStringList Decoder::m_disabledNames;
-QList<QmmpPluginCache*> *Decoder::m_cache = 0;
+QList<QmmpPluginCache*> *Decoder::m_cache = nullptr;
 
 //sort cache items by priority
 static bool _pluginCacheLessComparator(QmmpPluginCache* f1, QmmpPluginCache* f2)
@@ -175,7 +175,7 @@ QStringList Decoder::protocols()
 DecoderFactory *Decoder::findByFilePath(const QString &path, bool useContent)
 {
     loadPlugins();
-    DecoderFactory *fact = 0;
+    DecoderFactory *fact = nullptr;
     //detect by content if enabled
     if(useContent)
     {
@@ -183,7 +183,7 @@ DecoderFactory *Decoder::findByFilePath(const QString &path, bool useContent)
         if(!file.open(QIODevice::ReadOnly))
         {
             qWarning("Decoder: file open error: %s", qPrintable(file.errorString()));
-            return 0;
+            return nullptr;
         }
 
         foreach(QmmpPluginCache *item, *m_cache)
@@ -200,13 +200,13 @@ DecoderFactory *Decoder::findByFilePath(const QString &path, bool useContent)
             if (fact->canDecode(&file))
                 return fact;
         }
-        fact = 0;
+        fact = nullptr;
     }
 
     QList<DecoderFactory*> filtered = findByFileExtension(path);
 
     if(filtered.isEmpty())
-        return 0;
+        return nullptr;
 
     if(filtered.size() == 1)
         return filtered.at(0);
@@ -217,7 +217,7 @@ DecoderFactory *Decoder::findByFilePath(const QString &path, bool useContent)
     if(!file.open(QIODevice::ReadOnly))
     {
         qWarning("Decoder: file open error: %s", qPrintable(file.errorString()));
-        return 0;
+        return nullptr;
     }
 
     foreach (fact, filtered)
@@ -229,13 +229,13 @@ DecoderFactory *Decoder::findByFilePath(const QString &path, bool useContent)
     if(!filtered.isEmpty() && !useContent) //fallback
         return filtered.first();
 
-    return 0;
+    return nullptr;
 }
 
 DecoderFactory *Decoder::findByMime(const QString& type)
 {
     if(type.isEmpty())
-        return 0;
+        return nullptr;
     loadPlugins();
     foreach (QmmpPluginCache *item, *m_cache)
     {
@@ -245,7 +245,7 @@ DecoderFactory *Decoder::findByMime(const QString& type)
         if(fact && !fact->properties().noInput && fact->properties().contentTypes.contains(type))
             return fact;
     }
-    return 0;
+    return nullptr;
 }
 
 DecoderFactory *Decoder::findByContent(QIODevice *input)
@@ -259,7 +259,7 @@ DecoderFactory *Decoder::findByContent(QIODevice *input)
         if(fact && !fact->properties().noInput && fact->canDecode(input))
             return fact;
     }
-    return 0;
+    return nullptr;
 }
 
 DecoderFactory *Decoder::findByProtocol(const QString &p)
@@ -273,13 +273,13 @@ DecoderFactory *Decoder::findByProtocol(const QString &p)
         if (item->decoderFactory() && item->decoderFactory()->properties().protocols.contains(p))
             return item->decoderFactory();
     }
-    return 0;
+    return nullptr;
 }
 
 QList<DecoderFactory *> Decoder::findByFileExtension(const QString &path)
 {
     QList<DecoderFactory*> filtered;
-    DecoderFactory *fact = 0;
+    DecoderFactory *fact = nullptr;
     foreach (QmmpPluginCache *item, *m_cache)
     {
         if(m_disabledNames.contains(item->shortName()))
diff --git a/src/qmmp/decoder.h b/src/qmmp/decoder.h
index 254e0d204..969a35b15 100644
--- a/src/qmmp/decoder.h
+++ b/src/qmmp/decoder.h
@@ -29,7 +29,7 @@ public:
      * Object contsructor.
      * @param input QIODevice-based input source.
      */
-    Decoder(QIODevice *input = 0);
+    Decoder(QIODevice *input = nullptr);
     /*!
      * Destructor.
      */
diff --git a/src/qmmp/decoderfactory.h b/src/qmmp/decoderfactory.h
index 3eec5b9ad..5ed11da70 100644
--- a/src/qmmp/decoderfactory.h
+++ b/src/qmmp/decoderfactory.h
@@ -81,7 +81,7 @@ public:
      * @param path File path
      * @param input Input data (if required)
      */
-    virtual Decoder *create(const QString &path, QIODevice *input = 0) = 0;
+    virtual Decoder *create(const QString &path, QIODevice *input = nullptr) = 0;
     /*!
      * Extracts metadata and audio information from file \b path and returns a list of \b TrackInfo items.
      * One file may contain several playlist items (for example: cda disk or flac with embedded cue)
diff --git a/src/qmmp/effect.cpp b/src/qmmp/effect.cpp
index 32c9b0e63..ab921fd0e 100644
--- a/src/qmmp/effect.cpp
+++ b/src/qmmp/effect.cpp
@@ -31,7 +31,7 @@ Effect::Effect()
 {
     m_freq = 0;
     m_channels = 0;
-    m_factory = 0;
+    m_factory = nullptr;
 }
 
 Effect::~Effect()
@@ -75,7 +75,7 @@ bool _effectCacheCompareFunc(QmmpPluginCache *e1, QmmpPluginCache *e2)
 }
 
 //static members
-QList<QmmpPluginCache*> *Effect::m_cache = 0;
+QList<QmmpPluginCache*> *Effect::m_cache = nullptr;
 QStringList Effect::m_enabledNames;
 
 void Effect::loadPlugins()
@@ -185,5 +185,5 @@ EffectFactory *Effect::findFactory(const QString &shortName)
         if(shortName == f->properties().shortName)
             return f;
     }
-    return 0;
+    return nullptr;
 }
diff --git a/src/qmmp/emptyinputsource.cpp b/src/qmmp/emptyinputsource.cpp
index 3d86d95bf..e9a082d38 100644
--- a/src/qmmp/emptyinputsource.cpp
+++ b/src/qmmp/emptyinputsource.cpp
@@ -27,7 +27,7 @@ EmptyInputSource::EmptyInputSource(const QString &url, QObject *parent) : InputS
 
 QIODevice *EmptyInputSource::ioDevice()
 {
-    return 0;
+    return nullptr;
 }
 
 bool EmptyInputSource::initialize()
diff --git a/src/qmmp/emptyinputsource_p.h b/src/qmmp/emptyinputsource_p.h
index ae99b0bfc..156cc179b 100644
--- a/src/qmmp/emptyinputsource_p.h
+++ b/src/qmmp/emptyinputsource_p.h
@@ -30,7 +30,7 @@ class EmptyInputSource : public InputSource
 {
 Q_OBJECT
 public:
-    EmptyInputSource(const QString &path, QObject *parent = 0);
+    EmptyInputSource(const QString &path, QObject *parent = nullptr);
 
     QIODevice *ioDevice();
     bool initialize();
diff --git a/src/qmmp/enginefactory.h b/src/qmmp/enginefactory.h
index 32c9a0237..6c0e9d3e8 100644
--- a/src/qmmp/enginefactory.h
+++ b/src/qmmp/enginefactory.h
@@ -78,7 +78,7 @@ public:
      * Creates engine object.
      * @param parent Parent object File path
      */
-    virtual AbstractEngine *create(QObject *parent = 0) = 0;
+    virtual AbstractEngine *create(QObject *parent = nullptr) = 0;
     /*!
      * Extracts metadata and audio information from file \b path and returns a list of FileInfo items.
      * One file may contain several playlist items (for example: cda disk or flac with embedded cue).
diff --git a/src/qmmp/fileinputsource_p.h b/src/qmmp/fileinputsource_p.h
index 0f310e640..a0ba947d5 100644
--- a/src/qmmp/fileinputsource_p.h
+++ b/src/qmmp/fileinputsource_p.h
@@ -32,7 +32,7 @@ class FileInputSource : public InputSource
 {
 Q_OBJECT
 public:
-    FileInputSource(const QString &path, QObject *parent = 0);
+    FileInputSource(const QString &path, QObject *parent = nullptr);
 
     QIODevice *ioDevice();
     bool initialize();
diff --git a/src/qmmp/inputsource.cpp b/src/qmmp/inputsource.cpp
index 27da7a53a..bdcb21089 100644
--- a/src/qmmp/inputsource.cpp
+++ b/src/qmmp/inputsource.cpp
@@ -94,12 +94,12 @@ QHash<QString, QString> InputSource::takeStreamInfo()
 
 // static methods
 QStringList InputSource::m_disabledNames;
-QList<QmmpPluginCache*> *InputSource::m_cache = 0;
+QList<QmmpPluginCache*> *InputSource::m_cache = nullptr;
 
 InputSource *InputSource::create(const QString &url, QObject *parent)
 {
     loadPlugins();
-    InputSourceFactory *factory = 0;
+    InputSourceFactory *factory = nullptr;
     if(!url.contains("://")) //local file path doesn't contain "://"
     {
         qDebug("InputSource: using file transport");
@@ -115,7 +115,7 @@ InputSource *InputSource::create(const QString &url, QObject *parent)
         if(factory && factory->properties().protocols.contains(url.section("://", 0, 0)))
             break;
         else
-            factory = 0;
+            factory = nullptr;
     }
     if(factory)
     {
diff --git a/src/qmmp/inputsource.h b/src/qmmp/inputsource.h
index eb9e1f6a8..bcbb5c28a 100644
--- a/src/qmmp/inputsource.h
+++ b/src/qmmp/inputsource.h
@@ -44,7 +44,7 @@ public:
      * @param path Input source path or url.
      * @param parent Parent object.
      */
-    InputSource(const QString &path, QObject *parent = 0);
+    InputSource(const QString &path, QObject *parent = nullptr);
     /*!
      * Returns QIODevice-based object for I/O operations.
      * Subclass shoud reimplement this function.
@@ -117,7 +117,7 @@ public:
      * @param parent Parent object.
      * Returns \b 0 if the given url is not supported.
      */
-    static InputSource *create(const QString &path, QObject *parent = 0);
+    static InputSource *create(const QString &path, QObject *parent = nullptr);
     /*!
      * Returns a list of transport factories.
      */
diff --git a/src/qmmp/inputsourcefactory.h b/src/qmmp/inputsourcefactory.h
index d8c59db14..115485005 100644
--- a/src/qmmp/inputsourcefactory.h
+++ b/src/qmmp/inputsourcefactory.h
@@ -65,7 +65,7 @@ public:
      * @param url URL of the stream.
      * @param parent Parent object.
      */
-    virtual InputSource *create(const QString &url, QObject *parent = 0) = 0;
+    virtual InputSource *create(const QString &url, QObject *parent = nullptr) = 0;
     /*!
      * Shows settings dialog.
      * @param parent Parent widget.
diff --git a/src/qmmp/metadatamanager.cpp b/src/qmmp/metadatamanager.cpp
index cc7185718..76bc632a3 100644
--- a/src/qmmp/metadatamanager.cpp
+++ b/src/qmmp/metadatamanager.cpp
@@ -31,7 +31,7 @@
 
 #define COVER_CACHE_SIZE 10
 
-MetaDataManager* MetaDataManager::m_instance = 0;
+MetaDataManager* MetaDataManager::m_instance = nullptr;
 
 MetaDataManager::MetaDataManager() : m_mutex(QMutex::Recursive)
 {
@@ -44,14 +44,14 @@ MetaDataManager::MetaDataManager() : m_mutex(QMutex::Recursive)
 MetaDataManager::~MetaDataManager()
 {
     clearCoverCache();
-    m_instance = 0;
+    m_instance = nullptr;
 }
 
 QList<TrackInfo *> MetaDataManager::createPlayList(const QString &path, TrackInfo::Parts parts, QStringList *ignoredPaths) const
 {
     QList <TrackInfo *> list;
-    DecoderFactory *fact = 0;
-    EngineFactory *efact = 0;
+    DecoderFactory *fact = nullptr;
+    EngineFactory *efact = nullptr;
     QStringList dummyList;
     if(!ignoredPaths)
         ignoredPaths = &dummyList;
@@ -98,23 +98,23 @@ QList<TrackInfo *> MetaDataManager::createPlayList(const QString &path, TrackInf
 
 MetaDataModel* MetaDataManager::createMetaDataModel(const QString &path, bool readOnly) const
 {
-    DecoderFactory *fact = 0;
-    EngineFactory *efact = 0;
+    DecoderFactory *fact = nullptr;
+    EngineFactory *efact = nullptr;
 
     if (!path.contains("://")) //local file
     {
         if(!QFile::exists(path))
-            return 0;
+            return nullptr;
         else if((fact = Decoder::findByFilePath(path, m_settings->determineFileTypeByContent())))
             return fact->createMetaDataModel(path, readOnly);
         else if((efact = AbstractEngine::findByFilePath(path)))
             return efact->createMetaDataModel(path, readOnly);
-        return 0;
+        return nullptr;
     }
     else
     {
         QString scheme = path.section("://",0,0);
-        MetaDataModel *model = 0;
+        MetaDataModel *model = nullptr;
         if((fact = Decoder::findByProtocol(scheme)))
         {
             return fact->createMetaDataModel(path, readOnly);
@@ -127,7 +127,7 @@ MetaDataModel* MetaDataManager::createMetaDataModel(const QString &path, bool re
                 return model;
         }
     }
-    return 0;
+    return nullptr;
 }
 
 QStringList MetaDataManager::filters() const
@@ -177,8 +177,8 @@ QStringList MetaDataManager::protocols() const
 
 bool MetaDataManager::supports(const QString &fileName) const
 {
-    DecoderFactory *fact = 0;
-    EngineFactory *efact = 0;
+    DecoderFactory *fact = nullptr;
+    EngineFactory *efact = nullptr;
     if (!fileName.contains("://")) //local file
     {
         if (!QFile::exists(fileName))
diff --git a/src/qmmp/metadatamanager.h b/src/qmmp/metadatamanager.h
index 171dcbcd6..ac88f8a47 100644
--- a/src/qmmp/metadatamanager.h
+++ b/src/qmmp/metadatamanager.h
@@ -57,7 +57,7 @@ public:
      * @param ignoredPaths Pointer to a list of the files which should be ignored by the recursive search
      * (useful to exclude cue data files from playlist)
      */
-    QList <TrackInfo *> createPlayList(const QString &path, TrackInfo::Parts parts = TrackInfo::AllParts, QStringList *ignoredPaths = 0) const;
+    QList <TrackInfo *> createPlayList(const QString &path, TrackInfo::Parts parts = TrackInfo::AllParts, QStringList *ignoredPaths = nullptr) const;
     /*!
      * Creats metadata object, which provides full access to file tags.
      * @param url File path or URL.
diff --git a/src/qmmp/output.cpp b/src/qmmp/output.cpp
index 10b75229b..ff5bd0495 100644
--- a/src/qmmp/output.cpp
+++ b/src/qmmp/output.cpp
@@ -74,7 +74,7 @@ Output::~Output()
 {}
 
 // static methods
-QList<QmmpPluginCache*> *Output::m_cache = 0;
+QList<QmmpPluginCache*> *Output::m_cache = nullptr;
 
 void Output::loadPlugins()
 {
@@ -98,7 +98,7 @@ void Output::loadPlugins()
 Output *Output::create ()
 {
     loadPlugins();
-    Output *output = 0;
+    Output *output = nullptr;
     if (m_cache->isEmpty ())
     {
         qDebug("Output: unable to find output plugins");
@@ -167,5 +167,5 @@ OutputFactory *Output::currentFactory()
     }
     if (!m_cache->isEmpty())
         return m_cache->at(0)->outputFactory();
-    return 0;
+    return nullptr;
 }
diff --git a/src/qmmp/outputwriter.cpp b/src/qmmp/outputwriter.cpp
index 7a98f32fe..a5e5e0925 100644
--- a/src/qmmp/outputwriter.cpp
+++ b/src/qmmp/outputwriter.cpp
@@ -37,7 +37,7 @@ OutputWriter::OutputWriter (QObject* parent) : QThread (parent)
     m_handler = StateHandler::instance();
     m_frequency = 0;
     m_channels = 0;
-    m_output = 0;
+    m_output = nullptr;
     m_format = Qmmp::PCM_UNKNOWM;
     m_totalWritten = 0;
     m_currentMilliseconds = -1;
@@ -51,9 +51,9 @@ OutputWriter::OutputWriter (QObject* parent) : QThread (parent)
     m_useEq = false;
     m_muted = false;
     m_settings = QmmpSettings::instance();
-    m_format_converter = 0;
-    m_channel_converter = 0;
-    m_output_buf = 0;
+    m_format_converter = nullptr;
+    m_channel_converter = nullptr;
+    m_output_buf = nullptr;
     m_output_size = 0;
 }
 
@@ -83,7 +83,7 @@ bool OutputWriter::initialize(quint32 freq, ChannelMap map)
     {
         qWarning("OutputWriter: unable to initialize output");
         delete m_output;
-        m_output = 0;
+        m_output = nullptr;
         return false;
     }
     m_frequency = m_output->sampleRate();
@@ -99,7 +99,7 @@ bool OutputWriter::initialize(quint32 freq, ChannelMap map)
     {
         qWarning("OutputWriter: unable to convert audio");
         delete m_output;
-        m_output = 0;
+        m_output = nullptr;
         return false;
     }
 
@@ -175,12 +175,12 @@ bool OutputWriter::prepareConverters()
     if(m_format_converter)
     {
         delete m_format_converter;
-        m_format_converter = 0;
+        m_format_converter = nullptr;
     }
     if(m_channel_converter)
     {
         delete m_channel_converter;
-        m_channel_converter = 0;
+        m_channel_converter = nullptr;
     }
 
     if(m_channels != m_output->channels())
@@ -250,11 +250,11 @@ void OutputWriter::run()
     m_mutex.unlock ();
 
     bool done = false;
-    Buffer *b = 0;
+    Buffer *b = nullptr;
     quint64 l;
     qint64 m = 0;
     size_t output_at = 0;
-    unsigned char *tmp = 0;
+    unsigned char *tmp = nullptr;
 
     dispatch(Qmmp::Playing);
     dispatch(m_output->audioParameters());
@@ -370,7 +370,7 @@ void OutputWriter::run()
         recycler()->mutex()->lock ();
         recycler()->done();
         recycler()->mutex()->unlock();
-        b = 0;
+        b = nullptr;
         m_mutex.unlock();
     }
     m_mutex.lock();
diff --git a/src/qmmp/outputwriter_p.h b/src/qmmp/outputwriter_p.h
index 954aeff49..4cd72e6cb 100644
--- a/src/qmmp/outputwriter_p.h
+++ b/src/qmmp/outputwriter_p.h
@@ -44,7 +44,7 @@ class OutputWriter : public QThread
 {
     Q_OBJECT
 public:
-    explicit OutputWriter(QObject *parent = 0);
+    explicit OutputWriter(QObject *parent = nullptr);
 
     virtual ~OutputWriter();
     /*!
diff --git a/src/qmmp/qmmpaudioengine.cpp b/src/qmmp/qmmpaudioengine.cpp
index 8f08fa665..f7591581f 100644
--- a/src/qmmp/qmmpaudioengine.cpp
+++ b/src/qmmp/qmmpaudioengine.cpp
@@ -39,17 +39,17 @@
 #define TRANSPORT_TIMEOUT 5000 //ms
 
 QmmpAudioEngine::QmmpAudioEngine(QObject *parent)
-        : AbstractEngine(parent), m_factory(0), m_output(0)
+        : AbstractEngine(parent), m_factory(nullptr), m_output(nullptr)
 {
-    m_output_buf = 0;
+    m_output_buf = nullptr;
     m_output_size = 0;
     m_bks = 0;
     m_sample_size = 0;
-    m_decoder = 0;
-    m_output = 0;
+    m_decoder = nullptr;
+    m_output = nullptr;
     m_muted = false;
-    m_replayGain = 0;
-    m_dithering = 0;
+    m_replayGain = nullptr;
+    m_dithering = nullptr;
     m_converter = new AudioConverter;
 
     m_settings = QmmpSettings::instance();
@@ -66,9 +66,9 @@ QmmpAudioEngine::~QmmpAudioEngine()
     reset();
     if(m_output_buf)
         delete [] m_output_buf;
-    m_output_buf = 0;
+    m_output_buf = nullptr;
     qDeleteAll(m_effects);
-    m_instance = 0;
+    m_instance = nullptr;
     delete m_converter;
 }
 
@@ -89,7 +89,7 @@ void QmmpAudioEngine::clearDecoders()
     {
         m_inputs.take(m_decoder)->deleteLater ();
         delete m_decoder;
-        m_decoder = 0;
+        m_decoder = nullptr;
     }
     while(!m_decoders.isEmpty())
     {
@@ -129,14 +129,14 @@ bool QmmpAudioEngine::enqueue(InputSource *source)
     }
     mutex()->unlock();
 
-    DecoderFactory *factory = 0;
+    DecoderFactory *factory = nullptr;
 
     if(!source->path().contains("://"))
         factory = Decoder::findByFilePath(source->path(), m_settings->determineFileTypeByContent());
     if(!factory)
         factory = Decoder::findByMime(source->contentType());
     if(factory && !factory->properties().noInput && source->ioDevice() && source->path().contains("://"))
-        factory = (factory->canDecode(source->ioDevice()) ? factory : 0);
+        factory = (factory->canDecode(source->ioDevice()) ? factory : nullptr);
     if(!factory && source->ioDevice() && source->path().contains("://")) //ignore content of local files
         factory = Decoder::findByContent(source->ioDevice());
     if(!factory && source->path().contains("://"))
@@ -200,7 +200,7 @@ void QmmpAudioEngine::addEffect(EffectFactory *factory)
 
 void QmmpAudioEngine::removeEffect(EffectFactory *factory)
 {
-    Effect *effect = 0;
+    Effect *effect = nullptr;
     foreach(Effect *e, m_effects)
     {
         if(e->factory() == factory)
@@ -271,14 +271,14 @@ void QmmpAudioEngine::stop()
     if (m_output)
     {
         delete m_output;
-        m_output = 0;
+        m_output = nullptr;
     }
 
     clearDecoders();
     reset();
     while(!m_effects.isEmpty()) //delete effects
         delete m_effects.takeFirst();
-    m_replayGain = 0;
+    m_replayGain = nullptr;
 }
 
 qint64 QmmpAudioEngine::produceSound(unsigned char *data, qint64 size, quint32 brate)
@@ -621,13 +621,13 @@ void QmmpAudioEngine::attachMetaData(Decoder *decoder, DecoderFactory *factory,
 
 OutputWriter *QmmpAudioEngine::createOutput()
 {
-    OutputWriter *output = new OutputWriter(0);
+    OutputWriter *output = new OutputWriter(nullptr);
     output->setMuted(m_muted);
     if (!output->initialize(m_ap.sampleRate(), m_ap.channelMap()))
     {
         delete output;
         StateHandler::instance()->dispatch(Qmmp::FatalError);
-        return 0;
+        return nullptr;
     }
     return output;
 }
@@ -654,8 +654,8 @@ void QmmpAudioEngine::prepareEffects(Decoder *d)
             m_blockedEffects.removeAll(e);
         }
     }
-    m_replayGain = 0;
-    m_dithering = 0;
+    m_replayGain = nullptr;
+    m_dithering = nullptr;
     QList <Effect *> tmp_effects = m_effects;
     m_effects.clear();
 
@@ -686,7 +686,7 @@ void QmmpAudioEngine::prepareEffects(Decoder *d)
 
     foreach(EffectFactory *factory, Effect::enabledFactories())
     {
-        Effect *effect = 0;
+        Effect *effect = nullptr;
         foreach(Effect *e, tmp_effects) //find effect
         {
             if(e->factory() == factory)
@@ -699,7 +699,7 @@ void QmmpAudioEngine::prepareEffects(Decoder *d)
             m_blockedEffects.removeAll(effect);
             tmp_effects.removeAll(effect);
             delete effect;
-            effect = 0;
+            effect = nullptr;
         }
         if(!effect)
         {
@@ -719,7 +719,7 @@ void QmmpAudioEngine::prepareEffects(Decoder *d)
 }
 
 //static members
-QmmpAudioEngine *QmmpAudioEngine::m_instance = 0;
+QmmpAudioEngine *QmmpAudioEngine::m_instance = nullptr;
 
 QmmpAudioEngine *QmmpAudioEngine::instance()
 {
diff --git a/src/qmmp/qmmpplugincache.cpp b/src/qmmp/qmmpplugincache.cpp
index 323166883..9e289bb90 100644
--- a/src/qmmp/qmmpplugincache.cpp
+++ b/src/qmmp/qmmpplugincache.cpp
@@ -34,12 +34,12 @@
 QmmpPluginCache::QmmpPluginCache(const QString &file, QSettings *settings)
 {
     m_error = false;
-    m_instance = 0;
-    m_decoderFactory = 0;
-    m_outputFactory = 0;
-    m_engineFactory = 0;
-    m_effectFactory = 0;
-    m_inputSourceFactory = 0;
+    m_instance = nullptr;
+    m_decoderFactory = nullptr;
+    m_outputFactory = nullptr;
+    m_engineFactory = nullptr;
+    m_effectFactory = nullptr;
+    m_inputSourceFactory = nullptr;
     m_priority = 0;
     bool update = false;
     QFileInfo info(file);
@@ -192,7 +192,7 @@ bool QmmpPluginCache::hasError() const
 QObject *QmmpPluginCache::instance()
 {
     if(m_error)
-        return 0;
+        return nullptr;
     if(m_instance)
         return m_instance;
     QPluginLoader loader(m_path);
diff --git a/src/qmmp/qmmpsettings.cpp b/src/qmmp/qmmpsettings.cpp
index 2e866ebaf..720d153a4 100644
--- a/src/qmmp/qmmpsettings.cpp
+++ b/src/qmmp/qmmpsettings.cpp
@@ -25,7 +25,7 @@
 #include "qmmp.h"
 #include "qmmpsettings.h"
 
-QmmpSettings *QmmpSettings::m_instance = 0;
+QmmpSettings *QmmpSettings::m_instance = nullptr;
 
 QmmpSettings::QmmpSettings(QObject *parent) : QObject(parent)
 {
@@ -70,7 +70,7 @@ QmmpSettings::QmmpSettings(QObject *parent) : QObject(parent)
 QmmpSettings::~QmmpSettings()
 {
     sync();
-    m_instance = 0;
+    m_instance = nullptr;
 }
 
 QmmpSettings::ReplayGainMode QmmpSettings::replayGainMode() const
diff --git a/src/qmmp/qmmpsettings.h b/src/qmmp/qmmpsettings.h
index b78dc2369..bce4f39fd 100644
--- a/src/qmmp/qmmpsettings.h
+++ b/src/qmmp/qmmpsettings.h
@@ -41,7 +41,7 @@ public:
      * @param parent Parent object.
      * This functions is for internal usage only, use QmmpSettings::instance() instead.
      */
-    QmmpSettings(QObject *parent = 0);
+    QmmpSettings(QObject *parent = nullptr);
     /*!
      * Destructor.
      */
diff --git a/src/qmmp/recycler.cpp b/src/qmmp/recycler.cpp
index 52314a9d0..8dcab2227 100644
--- a/src/qmmp/recycler.cpp
+++ b/src/qmmp/recycler.cpp
@@ -15,9 +15,9 @@ Recycler::Recycler ()
     m_done_index = 0;
     m_current_count = 0;
     m_buffer_count = 0;
-    m_blocked = 0;
+    m_blocked = nullptr;
     m_block_samples = 0;
-    m_buffers = 0;
+    m_buffers = nullptr;
 }
 
 Recycler::~Recycler()
@@ -25,11 +25,11 @@ Recycler::~Recycler()
     for (unsigned int i = 0; i < m_buffer_count; i++)
     {
         delete m_buffers[i];
-        m_buffers[i] = 0;
+        m_buffers[i] = nullptr;
     }
     if(m_buffer_count)
         delete [] m_buffers;
-    m_blocked = 0;
+    m_blocked = nullptr;
 }
 
 void Recycler::configure(quint32 freq, int chan)
@@ -42,14 +42,14 @@ void Recycler::configure(quint32 freq, int chan)
     for (unsigned int i = 0; i < m_buffer_count; i++)
     {
         delete m_buffers[i];
-        m_buffers[i] = 0;
+        m_buffers[i] = nullptr;
     }
     if(m_buffer_count)
         delete [] m_buffers;
     m_add_index = 0;
     m_done_index = 0;
     m_current_count = 0;
-    m_blocked = 0;
+    m_blocked = nullptr;
     m_block_samples = block_samples;
     m_buffer_count = buffer_count;
 
@@ -94,7 +94,7 @@ int Recycler::used() const
 Buffer *Recycler::get()
 {
     if (full())
-        return 0;
+        return nullptr;
     return m_buffers[m_add_index];
 }
 
@@ -114,12 +114,12 @@ Buffer *Recycler::next()
         m_blocked = m_buffers[m_done_index];
         return m_blocked;
     }
-    return 0;
+    return nullptr;
 }
 
 void Recycler::done()
 {
-    m_blocked = 0;
+    m_blocked = nullptr;
     if (m_current_count)
     {
         m_current_count--;
diff --git a/src/qmmp/soundcore.cpp b/src/qmmp/soundcore.cpp
index 62c78c07d..d5e0aa33b 100644
--- a/src/qmmp/soundcore.cpp
+++ b/src/qmmp/soundcore.cpp
@@ -35,7 +35,7 @@
 #include "qmmpsettings.h"
 #include "soundcore.h"
 
-SoundCore *SoundCore::m_instance = 0;
+SoundCore *SoundCore::m_instance = nullptr;
 
 SoundCore::SoundCore(QObject *parent)
         : QObject(parent)
@@ -44,7 +44,7 @@ SoundCore::SoundCore(QObject *parent)
         qFatal("SoundCore: only one instance is allowed");
     qRegisterMetaType<Qmmp::State>("Qmmp::State");
     m_instance = this;
-    m_engine = 0;
+    m_engine = nullptr;
     m_nextState = NO_ENGINE;
     m_muted = false;
     m_handler = new StateHandler(this);
@@ -64,7 +64,7 @@ SoundCore::~SoundCore()
 {
     stop();
     MetaDataManager::destroy();
-    m_instance = 0;
+    m_instance = nullptr;
 }
 
 bool SoundCore::play(const QString &source, bool queue, qint64 offset)
@@ -335,7 +335,7 @@ void SoundCore::startNextEngine()
         if(m_engine)
         {
             m_engine->deleteLater();
-            m_engine = 0;
+            m_engine = nullptr;
         }
         if(!m_sources.isEmpty())
         {
diff --git a/src/qmmp/soundcore.h b/src/qmmp/soundcore.h
index d5875cf88..559c15093 100644
--- a/src/qmmp/soundcore.h
+++ b/src/qmmp/soundcore.h
@@ -49,7 +49,7 @@ public:
      * Object constructor.
      * @param parent Parent object.
      */
-    SoundCore(QObject *parent = 0);
+    SoundCore(QObject *parent = nullptr);
     /*!
      * Destructor.
      */
diff --git a/src/qmmp/statehandler.cpp b/src/qmmp/statehandler.cpp
index ed5b9c34a..e6d13784e 100644
--- a/src/qmmp/statehandler.cpp
+++ b/src/qmmp/statehandler.cpp
@@ -29,7 +29,7 @@
 #define TICK_INTERVAL 250
 #define PREFINISH_TIME 7000
 
-StateHandler* StateHandler::m_instance = 0;
+StateHandler* StateHandler::m_instance = nullptr;
 
 StateHandler::StateHandler(QObject *parent)
         : QObject(parent), m_mutex(QMutex::Recursive)
@@ -47,7 +47,7 @@ StateHandler::StateHandler(QObject *parent)
 
 StateHandler::~StateHandler()
 {
-    m_instance = 0;
+    m_instance = nullptr;
 }
 
 void StateHandler::dispatch(qint64 elapsed, int bitrate)
diff --git a/src/qmmp/statehandler.h b/src/qmmp/statehandler.h
index 40fbb974f..9dc9ca361 100644
--- a/src/qmmp/statehandler.h
+++ b/src/qmmp/statehandler.h
@@ -39,7 +39,7 @@ public:
      * Object constructor.
      * @param parent Parent object.
      */
-    StateHandler(QObject *parent = 0);
+    StateHandler(QObject *parent = nullptr);
     /*!
      * Destructor.
      */
diff --git a/src/qmmp/visual.cpp b/src/qmmp/visual.cpp
index 5c347ab0a..6a746258a 100644
--- a/src/qmmp/visual.cpp
+++ b/src/qmmp/visual.cpp
@@ -83,17 +83,17 @@ bool Visual::takeData(float *left, float *right)
         }
     }
     m_buffer.mutex()->unlock();
-    return node != 0;
+    return node != nullptr;
 }
 
 //static members
-QList<VisualFactory*> *Visual::m_factories = 0;
-QHash <VisualFactory*, QString> *Visual::m_files = 0;
+QList<VisualFactory*> *Visual::m_factories = nullptr;
+QHash <VisualFactory*, QString> *Visual::m_files = nullptr;
 QList<Visual*> Visual::m_visuals;
 QHash<VisualFactory*, Visual*> Visual::m_vis_map;
-QWidget *Visual::m_parentWidget = 0;
-QObject *Visual::m_receiver = 0;
-const char *Visual::m_member = 0;
+QWidget *Visual::m_parentWidget = nullptr;
+QObject *Visual::m_receiver = nullptr;
+const char *Visual::m_member = nullptr;
 VisualBuffer Visual::m_buffer;
 
 QList<VisualFactory *> Visual::factories()
@@ -254,7 +254,7 @@ void Visual::checkFactories()
             else
                 qWarning("Visual: %s", qPrintable(loader.errorString ()));
 
-            VisualFactory *factory = 0;
+            VisualFactory *factory = nullptr;
             if (plugin)
                 factory = qobject_cast<VisualFactory *>(plugin);
 
diff --git a/src/qmmp/visual.h b/src/qmmp/visual.h
index e31fa7442..e14446240 100644
--- a/src/qmmp/visual.h
+++ b/src/qmmp/visual.h
@@ -44,7 +44,7 @@ public:
     * @param parent Parent object.
     * @param f Widget flags.
     */
-    Visual(QWidget *parent, Qt::WindowFlags f = 0);
+    Visual(QWidget *parent, Qt::WindowFlags f = Qt::WindowFlags());
     /*!
      * Destructor.
      */
@@ -83,7 +83,7 @@ public:
      * @param receiver Receiver object.
      * @param member A slot to receive changes of active visualizations list.
      */
-    static void initialize(QWidget *parent, QObject *receiver = 0, const char *member = 0);
+    static void initialize(QWidget *parent, QObject *receiver = nullptr, const char *member = nullptr);
     /*!
      * Returns a pointer to a list of created visual objects.
      */
@@ -137,7 +137,7 @@ protected:
      * @param left Left channel buffer.
      * @param right Right channel buffer.
      */
-    bool takeData(float *left, float *right = 0);
+    bool takeData(float *left, float *right = nullptr);
 
 private:
     static QList<VisualFactory*> *m_factories;
diff --git a/src/qmmp/visualbuffer.cpp b/src/qmmp/visualbuffer.cpp
index e441eed24..d9baa9951 100644
--- a/src/qmmp/visualbuffer.cpp
+++ b/src/qmmp/visualbuffer.cpp
@@ -73,10 +73,10 @@ VisualNode *VisualBuffer::take()
         m_take_index %= VISUAL_BUFFER_SIZE;
     }
     if(m_buffer[m_take_index].ts < t) //unable to find node
-        return 0;
+        return nullptr;
 
     if(m_buffer[m_take_index].ts > t + 100) //node is more than 100 ms in the future. So, ignore it.
-        return 0;
+        return nullptr;
 
     return &m_buffer[m_take_index];
 }
diff --git a/src/qmmp/volumecontrol.cpp b/src/qmmp/volumecontrol.cpp
index e85128646..b2fb0317a 100644
--- a/src/qmmp/volumecontrol.cpp
+++ b/src/qmmp/volumecontrol.cpp
@@ -31,7 +31,7 @@ VolumeControl::VolumeControl(QObject *parent)
     m_left = 0;
     m_right = 0;
     m_prev_block = false;
-    m_volume = 0;
+    m_volume = nullptr;
     m_timer = new QTimer(this);
     connect(m_timer, SIGNAL(timeout()), SLOT(checkVolume()));
     reload();
@@ -125,7 +125,7 @@ void VolumeControl::reload()
     if(m_volume)
     {
         delete m_volume;
-        m_volume = 0;
+        m_volume = nullptr;
     }
     if(!QmmpSettings::instance()->useSoftVolume() && Output::currentFactory())
     {
@@ -150,7 +150,7 @@ void VolumeControl::reload()
     }
 }
 
-SoftwareVolume *SoftwareVolume::m_instance = 0;
+SoftwareVolume *SoftwareVolume::m_instance = nullptr;
 
 SoftwareVolume::SoftwareVolume()
 {
@@ -167,7 +167,7 @@ SoftwareVolume::~SoftwareVolume()
     QSettings settings(Qmmp::configFile(), QSettings::IniFormat);
     settings.setValue("Volume/left", m_left);
     settings.setValue("Volume/right", m_right);
-    m_instance = 0;
+    m_instance = nullptr;
 }
 
 void SoftwareVolume::setVolume(const VolumeSettings &v)
diff --git a/src/qmmp/volumecontrol_p.h b/src/qmmp/volumecontrol_p.h
index 6b67086ca..00cd4d676 100644
--- a/src/qmmp/volumecontrol_p.h
+++ b/src/qmmp/volumecontrol_p.h
@@ -40,7 +40,7 @@ public:
      * Object constructor.
      * @param parent Parent object.
      */
-    VolumeControl(QObject *parent = 0);
+    VolumeControl(QObject *parent = nullptr);
     /*!
      * Destructor.
      */
diff --git a/src/qmmpui/aboutdialog_p.h b/src/qmmpui/aboutdialog_p.h
index 3857c48e6..4c7b97775 100644
--- a/src/qmmpui/aboutdialog_p.h
+++ b/src/qmmpui/aboutdialog_p.h
@@ -33,7 +33,7 @@ class AboutDialog : public QDialog, private Ui::AboutDialog
 {
     Q_OBJECT
 public:
-    AboutDialog(QWidget* parent = 0);
+    AboutDialog(QWidget* parent = nullptr);
     ~AboutDialog();
 
 private:
diff --git a/src/qmmpui/addurldialog.cpp b/src/qmmpui/addurldialog.cpp
index 73a0b52ac..e121cf51e 100644
--- a/src/qmmpui/addurldialog.cpp
+++ b/src/qmmpui/addurldialog.cpp
@@ -61,7 +61,7 @@ AddUrlDialog::~AddUrlDialog()
     settings.setValue("URLDialog/history", m_history);
 }
 
-QPointer<AddUrlDialog> AddUrlDialog::m_instance = 0;
+QPointer<AddUrlDialog> AddUrlDialog::m_instance = nullptr;
 
 void AddUrlDialog::popup(QWidget* parent, PlayListModel* model)
 {
diff --git a/src/qmmpui/columneditor_p.h b/src/qmmpui/columneditor_p.h
index 2c49973c1..60883df0f 100644
--- a/src/qmmpui/columneditor_p.h
+++ b/src/qmmpui/columneditor_p.h
@@ -34,7 +34,7 @@ class ColumnEditor : public QDialog
 {
     Q_OBJECT
 public:
-    explicit ColumnEditor(const QString &name, const QString &patt, QWidget *parent = 0);
+    explicit ColumnEditor(const QString &name, const QString &patt, QWidget *parent = nullptr);
     ~ColumnEditor();
 
     QString name() const;
diff --git a/src/qmmpui/commandlinemanager.cpp b/src/qmmpui/commandlinemanager.cpp
index 295e78cdb..c7e04e88c 100644
--- a/src/qmmpui/commandlinemanager.cpp
+++ b/src/qmmpui/commandlinemanager.cpp
@@ -32,8 +32,8 @@
 #include "mediaplayer.h"
 #include "commandlinemanager.h"
 
-QList<CommandLineHandler *> *CommandLineManager::m_options = 0;
-QHash<CommandLineHandler*, QString> *CommandLineManager::m_files = 0;
+QList<CommandLineHandler *> *CommandLineManager::m_options = nullptr;
+QHash<CommandLineHandler*, QString> *CommandLineManager::m_files = nullptr;
 
 void CommandLineManager::checkOptions()
 {
@@ -51,7 +51,7 @@ void CommandLineManager::checkOptions()
             else
                 qWarning("CommandLineManager: %s", qPrintable(loader.errorString ()));
 
-            CommandLineHandler *option = 0;
+            CommandLineHandler *option = nullptr;
             if (plugin)
                 option = qobject_cast<CommandLineHandler *>(plugin);
 
@@ -99,7 +99,7 @@ bool CommandLineManager::hasOption(const QString &opt_str, CommandLineHandler::O
 {
     checkOptions();
     if(flags)
-        *flags = 0;
+        *flags = nullptr;
     foreach(CommandLineHandler *opt, *m_options)
     {
         int id = opt->identify(opt_str);
diff --git a/src/qmmpui/commandlinemanager.h b/src/qmmpui/commandlinemanager.h
index 88a6177b7..9deb02ab7 100644
--- a/src/qmmpui/commandlinemanager.h
+++ b/src/qmmpui/commandlinemanager.h
@@ -42,7 +42,7 @@ public:
     /*!
      * Return \b true if command \b opt_str is supported, otherwise returns \b false.
      */
-    static bool hasOption(const QString &opt_str, CommandLineHandler::OptionFlags *flags = 0);
+    static bool hasOption(const QString &opt_str, CommandLineHandler::OptionFlags *flags = nullptr);
     /*!
      * Prints usage to stdout.
      */
diff --git a/src/qmmpui/configdialog.h b/src/qmmpui/configdialog.h
index 6f773e727..8b1df9b67 100644
--- a/src/qmmpui/configdialog.h
+++ b/src/qmmpui/configdialog.h
@@ -46,7 +46,7 @@ public:
      * Constructor.
      * @param parent Parent widget
      */
-    ConfigDialog(QWidget *parent = 0);
+    ConfigDialog(QWidget *parent = nullptr);
     /*!
      * Destructor
      */
diff --git a/src/qmmpui/covereditor_p.h b/src/qmmpui/covereditor_p.h
index 4cf7f649f..6621865a1 100644
--- a/src/qmmpui/covereditor_p.h
+++ b/src/qmmpui/covereditor_p.h
@@ -37,7 +37,7 @@ class CoverEditor : public QWidget
 {
     Q_OBJECT
 public:
-    explicit CoverEditor(MetaDataModel *model, const QString &coverPath, QWidget *parent = 0);
+    explicit CoverEditor(MetaDataModel *model, const QString &coverPath, QWidget *parent = nullptr);
 
     bool isEditable() const;
     void save();
diff --git a/src/qmmpui/coverviewer_p.h b/src/qmmpui/coverviewer_p.h
index dbe3ba65b..28b438d1b 100644
--- a/src/qmmpui/coverviewer_p.h
+++ b/src/qmmpui/coverviewer_p.h
@@ -34,7 +34,7 @@ class CoverViewer : public QWidget
 {
 Q_OBJECT
 public:
-    CoverViewer(QWidget *parent = 0);
+    CoverViewer(QWidget *parent = nullptr);
 
     ~CoverViewer();
 
diff --git a/src/qmmpui/detailsdialog.cpp b/src/qmmpui/detailsdialog.cpp
index 8258f3d2a..f11ae8e54 100644
--- a/src/qmmpui/detailsdialog.cpp
+++ b/src/qmmpui/detailsdialog.cpp
@@ -44,7 +44,7 @@ DetailsDialog::DetailsDialog(QList<PlayListTrack *> tracks, QWidget *parent)
     m_ui->directoryButton->setIcon(QApplication::style()->standardIcon(QStyle::SP_DirOpenIcon));
     m_ui->nextButton->setIcon(QApplication::style()->standardIcon(QStyle::SP_ArrowRight));
     m_ui->prevButton->setIcon(QApplication::style()->standardIcon(QStyle::SP_ArrowLeft));
-    m_metaDataModel = 0;
+    m_metaDataModel = nullptr;
     m_page = 0;
     m_tracks = tracks;
     updatePage();
@@ -56,7 +56,7 @@ DetailsDialog::~DetailsDialog()
     if(m_metaDataModel)
     {
         delete m_metaDataModel;
-        m_metaDataModel = 0;
+        m_metaDataModel = nullptr;
     }
     delete m_ui;
 }
@@ -85,7 +85,7 @@ void DetailsDialog::on_buttonBox_clicked(QAbstractButton *button)
     if(m_ui->buttonBox->standardButton(button) == QDialogButtonBox::Save)
     {
         TagEditor *tagEditor = qobject_cast<TagEditor *>(m_ui->tabWidget->currentWidget());
-        CoverEditor *coverEditor = 0;
+        CoverEditor *coverEditor = nullptr;
         if(tagEditor)
             tagEditor->save();
         else if((coverEditor = qobject_cast<CoverEditor *>(m_ui->tabWidget->currentWidget())))
@@ -100,7 +100,7 @@ void DetailsDialog::on_buttonBox_clicked(QAbstractButton *button)
         if(m_metaDataModel)
         {
             delete m_metaDataModel;
-            m_metaDataModel = 0;
+            m_metaDataModel = nullptr;
         }
         reject();
     }
@@ -108,7 +108,7 @@ void DetailsDialog::on_buttonBox_clicked(QAbstractButton *button)
 
 void DetailsDialog::on_tabWidget_currentChanged(int index)
 {
-    CoverEditor *coverEditor = 0;
+    CoverEditor *coverEditor = nullptr;
     if(qobject_cast<TagEditor *>(m_ui->tabWidget->widget(index)))
         m_ui->buttonBox->button(QDialogButtonBox::Save)->setEnabled(m_metaDataModel && !m_metaDataModel->isReadOnly());
     else if((coverEditor = qobject_cast<CoverEditor *>(m_ui->tabWidget->currentWidget())))
@@ -141,7 +141,7 @@ void DetailsDialog::closeEvent(QCloseEvent *)
     if(m_metaDataModel)
     {
         delete m_metaDataModel;
-        m_metaDataModel = 0;
+        m_metaDataModel = nullptr;
     }
 }
 
@@ -150,7 +150,7 @@ void DetailsDialog::updatePage()
     if(m_metaDataModel)
     {
         delete m_metaDataModel;
-        m_metaDataModel = 0;
+        m_metaDataModel = nullptr;
     }
 
     while (m_ui->tabWidget->count() > 1)
diff --git a/src/qmmpui/detailsdialog.h b/src/qmmpui/detailsdialog.h
index 357cf14f0..de1fe3a0b 100644
--- a/src/qmmpui/detailsdialog.h
+++ b/src/qmmpui/detailsdialog.h
@@ -48,7 +48,7 @@ public:
      * @param tracks a list of tracks which should be used.
      * @param parent Parent widget.
      */
-    DetailsDialog(QList<PlayListTrack *> tracks, QWidget *parent = 0);
+    DetailsDialog(QList<PlayListTrack *> tracks, QWidget *parent = nullptr);
     /*!
      * Destructor.
      */
diff --git a/src/qmmpui/filedialog.cpp b/src/qmmpui/filedialog.cpp
index 75cef24e2..05804a75c 100644
--- a/src/qmmpui/filedialog.cpp
+++ b/src/qmmpui/filedialog.cpp
@@ -30,9 +30,9 @@
 #include "qtfiledialog_p.h"
 
 //static functions
-FileDialog* FileDialog::m_instance = 0;
-QList<QmmpUiPluginCache*> *FileDialog::m_cache = 0;
-FileDialogFactory *FileDialog::m_currentFactory = 0;
+FileDialog* FileDialog::m_instance = nullptr;
+QList<QmmpUiPluginCache*> *FileDialog::m_cache = nullptr;
+FileDialogFactory *FileDialog::m_currentFactory = nullptr;
 
 void FileDialog::loadPlugins()
 {
@@ -163,7 +163,7 @@ void FileDialog::popup(QWidget *parent,
 FileDialog* FileDialog::instance()
 {
     loadPlugins();
-    FileDialogFactory *selected = 0;
+    FileDialogFactory *selected = nullptr;
 
     QSettings settings (Qmmp::configFile(), QSettings::IniFormat);
     QString name = settings.value("FileDialog", "qt_dialog").toString();
@@ -185,7 +185,7 @@ FileDialog* FileDialog::instance()
     if(m_instance)
     {
         delete m_instance;
-        m_instance = 0;
+        m_instance = nullptr;
     }
 
     m_currentFactory = selected;
@@ -196,7 +196,7 @@ FileDialog* FileDialog::instance()
 //base implementation
 FileDialog::FileDialog() : QObject(), m_initialized(false)
 {
-    m_lastDir = 0;
+    m_lastDir = nullptr;
 }
 
 FileDialog::~FileDialog() {}
diff --git a/src/qmmpui/filedialog.h b/src/qmmpui/filedialog.h
index a9099c374..405fb7db5 100644
--- a/src/qmmpui/filedialog.h
+++ b/src/qmmpui/filedialog.h
@@ -74,7 +74,7 @@ public:
      * @param caption Dialog title.
      * @param dir Default directory.
      */
-    static QString getExistingDirectory(QWidget *parent = 0,
+    static QString getExistingDirectory(QWidget *parent = nullptr,
                                         const QString &caption = QString(),
                                         const QString &dir = QString());
     /*!
@@ -87,11 +87,11 @@ public:
      * (example: "Audio (*.mp3 *.ogg);;Text files (*.txt);;XML files (*.xml)").
      * @param selectedFilter Default selected filter
      */
-    static QString getOpenFileName(QWidget *parent = 0,
+    static QString getOpenFileName(QWidget *parent = nullptr,
                                    const QString &caption = QString(),
                                    const QString &dir = QString(),
                                    const QString &filter = QString(),
-                                   QString *selectedFilter = 0);
+                                   QString *selectedFilter = nullptr);
     /*!
      * This is a static function that will open modal file dialog and
      * return an existing file selected by the user.
@@ -102,11 +102,11 @@ public:
      * (example: "Audio (*.mp3 *.ogg);;Text files (*.txt);;XML files (*.xml)").
      * @param selectedFilter Default selected filter.
      */
-    static QStringList getOpenFileNames(QWidget *parent = 0,
+    static QStringList getOpenFileNames(QWidget *parent = nullptr,
                                         const QString &caption = QString(),
                                         const QString &dir = QString(),
                                         const QString &filter = QString(),
-                                        QString *selectedFilter = 0);
+                                        QString *selectedFilter = nullptr);
     /*!
      * This is a static function that will open modal file dialog and
      * return a file name selected by the user. The file does not have to exist.
@@ -117,11 +117,11 @@ public:
      * (example: "Audio (*.mp3 *.ogg);;Text files (*.txt);;XML files (*.xml)").
      * @param selectedFilter Default selected filter.
      */
-    static QString getSaveFileName (QWidget *parent = 0,
+    static QString getSaveFileName (QWidget *parent = nullptr,
                                     const QString &caption = QString(),
                                     const QString &dir = QString(),
                                     const QString &filter = QString(),
-                                    QString *selectedFilter = 0);
+                                    QString *selectedFilter = nullptr);
     /*!
      * Opens nonmodal file dialog. Selected file dialog should support nonmodal mode.
      * Otherwise this function creates modal dialog.
@@ -138,11 +138,11 @@ public:
      *                 m_playListModel, SLOT(addFileList(QStringList)),
      *                 tr("Choose a directory"));
      */
-    static void popup(QWidget *parent = 0,
+    static void popup(QWidget *parent = nullptr,
                       Mode mode = AddFiles,
-                      QString *dir = 0,
-                      QObject *receiver = 0,
-                      const char *member = 0,
+                      QString *dir = nullptr,
+                      QObject *receiver = nullptr,
+                      const char *member = nullptr,
                       const QString &caption = QString(),
                       const QString &filters = QString());
 
@@ -186,7 +186,7 @@ protected:
     */
     virtual QStringList exec(QWidget *parent, const QString &dir, Mode mode,
                              const QString &caption, const QString &filter = QString(),
-                             QString *selectedFilter = 0) = 0;
+                             QString *selectedFilter = nullptr) = 0;
 
 private slots:
     void updateLastDir(const QStringList&);
diff --git a/src/qmmpui/fileloader.cpp b/src/qmmpui/fileloader.cpp
index ac3a43749..5650e17e1 100644
--- a/src/qmmpui/fileloader.cpp
+++ b/src/qmmpui/fileloader.cpp
@@ -289,19 +289,19 @@ void FileLoader::run()
 
 void FileLoader::add(const QString &path)
 {
-    insert(0, QStringList() << path);
+    insert(nullptr, QStringList() << path);
 }
 
 void FileLoader::add(const QStringList &paths)
 {
-    insert(0, paths);
+    insert(nullptr, paths);
 }
 
 void FileLoader::addPlayList(const QString &fmt, const QByteArray &data)
 {
     m_mutex.lock();
     LoaderTask task;
-    task.before = 0;
+    task.before = nullptr;
     task.playListFormat = fmt;
     task.playListContent = data;
     m_tasks.append(task);
diff --git a/src/qmmpui/fileloader_p.h b/src/qmmpui/fileloader_p.h
index f6b68f7c1..02772f726 100644
--- a/src/qmmpui/fileloader_p.h
+++ b/src/qmmpui/fileloader_p.h
@@ -49,7 +49,7 @@ public:
      * Constructs FileLoader object.
      * @param parent QObject parent
      */
-    FileLoader(QObject *parent = 0);
+    FileLoader(QObject *parent = nullptr);
     /*!
      * Object destructor.
      */
@@ -83,10 +83,10 @@ signals:
 
 private:
     void run();
-    QList<PlayListTrack*> processFile(const QString &path, QStringList *ignoredPaths = 0);
+    QList<PlayListTrack*> processFile(const QString &path, QStringList *ignoredPaths = nullptr);
     void insertPlayList(const QString &fmt, const QByteArray &contents, PlayListItem *before);
     void insertPlayList(const QString &path, PlayListItem *before);
-    void addDirectory(const QString &s, PlayListItem *before = 0);
+    void addDirectory(const QString &s, PlayListItem *before = nullptr);
     bool checkRestrictFilters(const QFileInfo &info);
     bool checkExcludeFilters(const QFileInfo &info);
     void removeIgnoredTracks(QList<PlayListTrack *> *tracks, const QStringList &ignoredPaths);
diff --git a/src/qmmpui/general.cpp b/src/qmmpui/general.cpp
index c233ef2d4..420277afd 100644
--- a/src/qmmpui/general.cpp
+++ b/src/qmmpui/general.cpp
@@ -25,10 +25,10 @@
 #include "qmmpuiplugincache_p.h"
 #include "general.h"
 
-QList<QmmpUiPluginCache*> *General::m_cache = 0;
+QList<QmmpUiPluginCache*> *General::m_cache = nullptr;
 QStringList General::m_enabledNames;
-QHash <GeneralFactory*, QObject*> *General::m_generals = 0;
-QObject *General::m_parent = 0;
+QHash <GeneralFactory*, QObject*> *General::m_generals = nullptr;
+QObject *General::m_parent = nullptr;
 
 void General::loadPlugins()
 {
diff --git a/src/qmmpui/groupedcontainer.cpp b/src/qmmpui/groupedcontainer.cpp
index 76a0bdaea..5b9bd562f 100644
--- a/src/qmmpui/groupedcontainer.cpp
+++ b/src/qmmpui/groupedcontainer.cpp
@@ -209,7 +209,7 @@ PlayListItem *GroupedContainer::item(int index) const
     if(index >= count() || index < 0)
     {
         qWarning("GroupedContainer: index is out of range");
-        return 0;
+        return nullptr;
     }
     return m_items.at(index);
 }
@@ -219,7 +219,7 @@ PlayListTrack *GroupedContainer::track(int index) const
     updateCache();
     PlayListItem *i = item(index);
     if(!i || i->isGroup())
-        return 0;
+        return nullptr;
     return dynamic_cast<PlayListTrack *> (i);
 }
 
@@ -228,7 +228,7 @@ PlayListGroup *GroupedContainer::group(int index) const
     PlayListItem *i = item(index);
     if(i && i->isGroup())
         return dynamic_cast<PlayListGroup *> (i);
-    return 0;
+    return nullptr;
 }
 
 bool GroupedContainer::contains(PlayListItem *item) const
@@ -259,7 +259,7 @@ PlayListTrack *GroupedContainer::findTrack(int number) const
         }
         firstNumber += group->count();
     }
-    return 0;
+    return nullptr;
 }
 
 void GroupedContainer::removeTrack(PlayListTrack *track)
@@ -290,7 +290,7 @@ void GroupedContainer::removeTracks(QList<PlayListTrack *> tracks)
 bool GroupedContainer::move(QList<int> indexes, int from, int to)
 {
     updateCache();
-    PlayListGroup *group = 0;
+    PlayListGroup *group = nullptr;
     int firstIndex = 0, lastIndex = 0;
 
     for(int i = 0; i < m_groups.count(); ++i)
diff --git a/src/qmmpui/jumptotrackdialog_p.h b/src/qmmpui/jumptotrackdialog_p.h
index ae5b5a8d4..6cffc7aee 100644
--- a/src/qmmpui/jumptotrackdialog_p.h
+++ b/src/qmmpui/jumptotrackdialog_p.h
@@ -41,7 +41,7 @@ class JumpToTrackDialog : public QDialog, private Ui::JumpToTrackDialog
     Q_OBJECT
 
 public:
-    JumpToTrackDialog(PlayListModel *model, QWidget* parent = 0);
+    JumpToTrackDialog(PlayListModel *model, QWidget* parent = nullptr);
     ~JumpToTrackDialog();
     void refresh();
 
diff --git a/src/qmmpui/mediaplayer.cpp b/src/qmmpui/mediaplayer.cpp
index 8dd0fbf61..f9a6f85ef 100644
--- a/src/qmmpui/mediaplayer.cpp
+++ b/src/qmmpui/mediaplayer.cpp
@@ -27,7 +27,7 @@
 #include "qmmpuisettings.h"
 #include "mediaplayer.h"
 
-MediaPlayer *MediaPlayer::m_instance = 0;
+MediaPlayer *MediaPlayer::m_instance = nullptr;
 
 MediaPlayer::MediaPlayer(QObject *parent)
         : QObject(parent)
@@ -35,8 +35,8 @@ MediaPlayer::MediaPlayer(QObject *parent)
     if(m_instance)
         qFatal("StateHandler: only one instance is allowed");
     m_instance = this;
-    m_pl_manager = 0;
-    m_core = 0;
+    m_pl_manager = nullptr;
+    m_core = nullptr;
     m_skips = 0;
     m_finishTimer = new QTimer(this);
     m_finishTimer->setSingleShot(true);
@@ -57,7 +57,7 @@ MediaPlayer::MediaPlayer(QObject *parent)
 
 MediaPlayer::~MediaPlayer()
 {
-    m_instance = 0;
+    m_instance = nullptr;
 }
 
 MediaPlayer* MediaPlayer::instance()
@@ -142,7 +142,7 @@ void MediaPlayer::playNext()
 void MediaPlayer::updateNextUrl()
 {
     m_nextUrl.clear();
-    PlayListTrack *track = 0;
+    PlayListTrack *track = nullptr;
     if(m_settings->isRepeatableTrack())
         track = m_pl_manager->currentPlayList()->currentTrack();
     else if(!m_settings->isNoPlayListAdvance())
diff --git a/src/qmmpui/mediaplayer.h b/src/qmmpui/mediaplayer.h
index ad2dd7b6d..4a971cad8 100644
--- a/src/qmmpui/mediaplayer.h
+++ b/src/qmmpui/mediaplayer.h
@@ -40,7 +40,7 @@ public:
      * Object constructor,
      * @param parent Parent object.
      */
-    MediaPlayer(QObject *parent = 0);
+    MediaPlayer(QObject *parent = nullptr);
     /*!
      * Destructor
      */
diff --git a/src/qmmpui/metadataformattermenu.h b/src/qmmpui/metadataformattermenu.h
index fa9b7fcf1..3c26d4d0c 100644
--- a/src/qmmpui/metadataformattermenu.h
+++ b/src/qmmpui/metadataformattermenu.h
@@ -38,7 +38,7 @@ public:
         COLUMN_MENU
     };
 
-    explicit MetaDataFormatterMenu(Type type, QWidget *parent = 0);
+    explicit MetaDataFormatterMenu(Type type, QWidget *parent = nullptr);
 
 signals:
     void patternSelected(const QString &pattern);
diff --git a/src/qmmpui/metadatahelper.cpp b/src/qmmpui/metadatahelper.cpp
index 3d1d63061..cd97791df 100644
--- a/src/qmmpui/metadatahelper.cpp
+++ b/src/qmmpui/metadatahelper.cpp
@@ -20,7 +20,7 @@
 
 #include "metadatahelper_p.h"
 
-MetaDataHelper *MetaDataHelper::m_instance = 0;
+MetaDataHelper *MetaDataHelper::m_instance = nullptr;
 
 MetaDataHelper::MetaDataHelper()
 {
@@ -31,7 +31,7 @@ MetaDataHelper::MetaDataHelper()
 
 MetaDataHelper::~MetaDataHelper()
 {
-    m_instance = 0;
+    m_instance = nullptr;
     delete m_group_formatter;
     qDeleteAll(m_title_formatters);
     m_title_formatters.clear();
diff --git a/src/qmmpui/normalcontainer.cpp b/src/qmmpui/normalcontainer.cpp
index 306bc922c..f1ef088f7 100644
--- a/src/qmmpui/normalcontainer.cpp
+++ b/src/qmmpui/normalcontainer.cpp
@@ -129,7 +129,7 @@ PlayListItem *NormalContainer::item(int index) const
     if(index >= count() || index < 0)
     {
         qWarning("NormalContainer: index is out of range");
-        return 0;
+        return nullptr;
     }
     return m_items.at(index);
 }
@@ -143,7 +143,7 @@ PlayListTrack *NormalContainer::track(int index) const
 PlayListGroup *NormalContainer::group(int index) const
 {
     Q_UNUSED(index);
-    return 0;
+    return nullptr;
 }
 
 bool NormalContainer::contains(PlayListItem *item) const
@@ -160,7 +160,7 @@ PlayListTrack *NormalContainer::findTrack(int number) const
 {
     if(number >= count() || number < 0)
     {
-        return 0;
+        return nullptr;
     }
     return dynamic_cast<PlayListTrack *> (m_items.at(number));
 }
diff --git a/src/qmmpui/playlistdownloader.cpp b/src/qmmpui/playlistdownloader.cpp
index a7463c277..16365e43d 100644
--- a/src/qmmpui/playlistdownloader.cpp
+++ b/src/qmmpui/playlistdownloader.cpp
@@ -28,7 +28,7 @@
 
 PlayListDownloader::PlayListDownloader(QObject *parent) : QObject(parent)
 {
-    m_getReply = 0;
+    m_getReply = nullptr;
     m_ua = QString("qmmp/%1").arg(Qmmp::strVersion()).toLatin1();
     m_manager = new QNetworkAccessManager(this);
     connect(m_manager, SIGNAL(finished (QNetworkReply *)), SLOT(readResponse(QNetworkReply *)));
@@ -94,7 +94,7 @@ void PlayListDownloader::readResponse(QNetworkReply *reply)
 
     if(reply == m_getReply)
     {
-        m_getReply = 0;
+        m_getReply = nullptr;
 
         if(m_model.isNull())
         {
diff --git a/src/qmmpui/playlistdownloader.h b/src/qmmpui/playlistdownloader.h
index af6cb377d..3d5dd46dc 100644
--- a/src/qmmpui/playlistdownloader.h
+++ b/src/qmmpui/playlistdownloader.h
@@ -40,7 +40,7 @@ public:
     /*!
      * Object constructor.
      */
-    explicit PlayListDownloader(QObject *parent = 0);
+    explicit PlayListDownloader(QObject *parent = nullptr);
 
 signals:
     /*!
diff --git a/src/qmmpui/playlistheadermodel.h b/src/qmmpui/playlistheadermodel.h
index 755ae019d..9d1303695 100644
--- a/src/qmmpui/playlistheadermodel.h
+++ b/src/qmmpui/playlistheadermodel.h
@@ -43,7 +43,7 @@ public:
      * Constructs a playlist model.
      * @param parent QObject parent.
      */
-    explicit PlayListHeaderModel(QObject *parent = 0);
+    explicit PlayListHeaderModel(QObject *parent = nullptr);
     /*!
      * Object destructor.
      */
@@ -93,13 +93,13 @@ public:
      * @param index Index of the column.
      * @param parent Parent widget,
      */
-    void execEdit(int index, QWidget *parent = 0);
+    void execEdit(int index, QWidget *parent = nullptr);
     /*!
      * Opens internal column editor and inserts new column if user press "ok".
      * @param index Required index of the column.
      * @param parent Parent widget.
      */
-    void execInsert(int index, QWidget *parent = 0);
+    void execInsert(int index, QWidget *parent = nullptr);
     /*!
      * Returns number of the columns.
      */
diff --git a/src/qmmpui/playlistmanager.cpp b/src/qmmpui/playlistmanager.cpp
index a29c4338d..a468ce6ca 100644
--- a/src/qmmpui/playlistmanager.cpp
+++ b/src/qmmpui/playlistmanager.cpp
@@ -30,7 +30,7 @@
 #include "qmmpuisettings.h"
 #include "playlistmanager.h"
 
-PlayListManager *PlayListManager::m_instance = 0;
+PlayListManager *PlayListManager::m_instance = nullptr;
 
 PlayListManager::PlayListManager(QObject *parent) : QObject(parent)
 {
@@ -40,8 +40,8 @@ PlayListManager::PlayListManager(QObject *parent) : QObject(parent)
     m_instance = this;
     m_ui_settings = QmmpUiSettings::instance();
     m_header = new PlayListHeaderModel(this);
-    m_current = 0;
-    m_selected = 0;
+    m_current = nullptr;
+    m_selected = nullptr;
     m_timer = new QTimer(this);
     m_timer->setInterval(5000);
     m_timer->setSingleShot(true);
@@ -69,7 +69,7 @@ PlayListManager::PlayListManager(QObject *parent) : QObject(parent)
 PlayListManager::~PlayListManager()
 {
     writePlayLists();
-    m_instance = 0;
+    m_instance = nullptr;
 }
 
 PlayListManager* PlayListManager::instance()
@@ -247,7 +247,7 @@ PlayListModel *PlayListManager::playListAt(int i) const
 {
     if(i >= 0 && i < m_models.count())
         return m_models.at(i);
-    return 0;
+    return nullptr;
 }
 
 PlayListHeaderModel *PlayListManager::headerModel()
diff --git a/src/qmmpui/playlistmodel.cpp b/src/qmmpui/playlistmodel.cpp
index 2a99e40c6..3883f28ad 100644
--- a/src/qmmpui/playlistmodel.cpp
+++ b/src/qmmpui/playlistmodel.cpp
@@ -41,11 +41,11 @@
 PlayListModel::PlayListModel(const QString &name, QObject *parent)
         : QObject(parent) , m_selection()
 {
-    qsrand(time(0));
+    qsrand(time(nullptr));
     m_ui_settings = QmmpUiSettings::instance();
     m_total_duration = 0;
     m_current = 0;
-    m_stop_track = 0;
+    m_stop_track = nullptr;
     m_name = name;
     m_loader = new FileLoader(this);
     m_task = new PlayListTask(this);
@@ -267,20 +267,20 @@ int PlayListModel::columnCount() const
 
 PlayListTrack* PlayListModel::currentTrack() const
 {
-    return m_container->isEmpty() ? 0 : m_current_track;
+    return m_container->isEmpty() ? nullptr : m_current_track;
 }
 
 PlayListTrack *PlayListModel::nextTrack() const
 {
     if(m_container->isEmpty() || !m_play_state)
-        return 0;
+        return nullptr;
     if(m_stop_track && m_stop_track == currentTrack())
-        return 0;
+        return nullptr;
     if(!isEmptyQueue())
         return m_queued_songs.at(0);
     int index = m_play_state->nextIndex();
     if(index < 0 || (index + 1 > m_container->count()))
-        return 0;
+        return nullptr;
     return m_container->track(index);
 }
 
@@ -350,7 +350,7 @@ bool PlayListModel::next()
 {
     if(m_stop_track == currentTrack())
     {
-        m_stop_track = 0;
+        m_stop_track = nullptr;
         emit listChanged(STOP_AFTER);
         return false;
     }
@@ -378,7 +378,7 @@ void PlayListModel::clear()
 {
     m_loader->finish();
     m_current = 0;
-    m_stop_track = 0;
+    m_stop_track = nullptr;
     m_container->clear();
     m_queued_songs.clear();
     m_total_duration = 0;
@@ -428,7 +428,7 @@ PlayListTrack *PlayListModel::findTrack(int track_index) const
 QList<PlayListItem *> PlayListModel::findTracks(const QString &str) const
 {
     QList<PlayListItem *> items;
-    PlayListItem *item = 0;
+    PlayListItem *item = nullptr;
     if(str.isEmpty())
         return items;
 
@@ -562,7 +562,7 @@ int PlayListModel::removeTrackInternal(int i)
     if(m_stop_track == track)
     {
         flags |= STOP_AFTER;
-        m_stop_track = 0;
+        m_stop_track = nullptr;
     }
     if(track->isSelected())
         flags |= SELECTION;
@@ -574,7 +574,7 @@ int PlayListModel::removeTrackInternal(int i)
     {
         flags |= CURRENT;
         if(m_container->isEmpty())
-            m_current_track = 0;
+            m_current_track = nullptr;
         else
         {
             m_current = i > 0 ? qMin(i - 1, m_container->count() - 1) : 0;
@@ -870,7 +870,7 @@ void PlayListModel::prepareForShufflePlaying(bool val)
 
 void PlayListModel::prepareGroups(bool enabled)
 {
-    PlayListContainer *container = 0;
+    PlayListContainer *container = nullptr;
     if(enabled)
         container = new GroupedContainer;
     else
@@ -927,7 +927,7 @@ void PlayListModel::onTaskFinished()
 
             if(m_stop_track && !m_container->contains(m_stop_track))
             {
-                m_stop_track = 0;
+                m_stop_track = nullptr;
                 flags |= STOP_AFTER;
             }
 
@@ -1006,7 +1006,7 @@ void PlayListModel::refresh()
 void PlayListModel::clearQueue()
 {
      m_queued_songs.clear();
-     m_stop_track = 0;
+     m_stop_track = nullptr;
      emit listChanged(QUEUE);
 }
 
@@ -1016,11 +1016,11 @@ void PlayListModel::stopAfterSelected()
     int flags = STOP_AFTER;
     if(!m_queued_songs.isEmpty())
     {
-        m_stop_track = m_stop_track != m_queued_songs.last() ? m_queued_songs.last() : 0;
+        m_stop_track = m_stop_track != m_queued_songs.last() ? m_queued_songs.last() : nullptr;
     }
     else if(selected_tracks.count() == 1)
     {
-        m_stop_track = m_stop_track != selected_tracks.at(0) ? selected_tracks.at(0) : 0;
+        m_stop_track = m_stop_track != selected_tracks.at(0) ? selected_tracks.at(0) : nullptr;
     }
     else if(selected_tracks.count() > 1)
     {
diff --git a/src/qmmpui/playlistmodel.h b/src/qmmpui/playlistmodel.h
index 6ca9471bf..0662aa4a0 100644
--- a/src/qmmpui/playlistmodel.h
+++ b/src/qmmpui/playlistmodel.h
@@ -109,7 +109,7 @@ public:
      * @param name Playlist name.
      * @param parent QObject parent
      */
-    PlayListModel(const QString &name, QObject *parent = 0);
+    PlayListModel(const QString &name, QObject *parent = nullptr);
     /*!
      * Object destructor.
      */
@@ -480,12 +480,12 @@ public slots:
      * Shows details for the first selected item.
      * @param parent parent Widget.
      */
-    void showDetails(QWidget *parent = 0);
+    void showDetails(QWidget *parent = nullptr);
     /*!
      * Shows the details for the current song (if any).
      * @param parent parent widget.
      */
-    void showDetailsForCurrent(QWidget *parent = 0);
+    void showDetailsForCurrent(QWidget *parent = nullptr);
     /*!
      * Ensures that the current track is visible.
      */
diff --git a/src/qmmpui/playlistparser.cpp b/src/qmmpui/playlistparser.cpp
index 2d8f67f06..c30c02ab5 100644
--- a/src/qmmpui/playlistparser.cpp
+++ b/src/qmmpui/playlistparser.cpp
@@ -27,7 +27,7 @@
 #include "playlistformat.h"
 #include "playlistparser.h"
 
-QList<PlayListFormat*> *PlayListParser::m_formats = 0;
+QList<PlayListFormat*> *PlayListParser::m_formats = nullptr;
 
 QList<PlayListFormat *> PlayListParser::formats()
 {
@@ -65,7 +65,7 @@ PlayListFormat *PlayListParser::findByMime(const QString &mime)
         if(format->properties().contentTypes.contains(mime))
             return format;
     }
-    return 0;
+    return nullptr;
 }
 
 PlayListFormat *PlayListParser::findByPath(const QString &filePath)
@@ -80,7 +80,7 @@ PlayListFormat *PlayListParser::findByPath(const QString &filePath)
                 return format;
         }
     }
-    return 0;
+    return nullptr;
 }
 
 PlayListFormat *PlayListParser::findByUrl(const QUrl &url)
@@ -172,7 +172,7 @@ void PlayListParser::loadFormats()
         else
             qWarning("PlayListParser: %s", qPrintable(loader.errorString ()));
 
-        PlayListFormat *fmt = 0;
+        PlayListFormat *fmt = nullptr;
         if (plugin)
             fmt = qobject_cast<PlayListFormat *>(plugin);
 
diff --git a/src/qmmpui/playlisttask.cpp b/src/qmmpui/playlisttask.cpp
index 027719a8e..8326af7ac 100644
--- a/src/qmmpui/playlisttask.cpp
+++ b/src/qmmpui/playlisttask.cpp
@@ -114,7 +114,7 @@ PlayListTask::PlayListTask(QObject *parent) : QThread(parent)
 {
     m_reverted = true;
     m_align_groups = false;
-    m_current_track = 0;
+    m_current_track = nullptr;
     m_column = 0;
     m_task = EMPTY;
     m_sort_mode = PlayListModel::TITLE;
@@ -294,8 +294,8 @@ void PlayListTask::run()
 
     if(m_task == SORT || m_task == SORT_SELECTION || m_task == SORT_BY_COLUMN)
     {
-        bool(*compareLessFunc)(TrackField*, TrackField*) = 0;
-        bool(*compareGreaterFunc)(TrackField*, TrackField*) = 0;
+        bool(*compareLessFunc)(TrackField*, TrackField*) = nullptr;
+        bool(*compareGreaterFunc)(TrackField*, TrackField*) = nullptr;
 
         QList<TrackField*>::iterator begin = m_fields.begin();
         QList<TrackField*>::iterator end = m_fields.end();
@@ -368,7 +368,7 @@ void PlayListTask::run()
     }
     else if(m_task == REMOVE_INVALID)
     {
-        TrackField *f = 0;
+        TrackField *f = nullptr;
         bool ok = false;
         for(int i = 0; i < m_fields.count(); ++i)
         {
@@ -386,7 +386,7 @@ void PlayListTask::run()
     else if(m_task == REMOVE_DUPLICATES)
     {
         QStringList urls;
-        TrackField *f = 0;
+        TrackField *f = nullptr;
         for(int i = 0; i < m_fields.count(); ++i)
         {
             f = m_fields.at(i);
@@ -403,7 +403,7 @@ void PlayListTask::run()
     }
     else if(m_task == REFRESH)
     {
-        TrackField *f = 0;
+        TrackField *f = nullptr;
         MetaDataManager *mm = MetaDataManager::instance();
         bool ok = false;
         //find invalid files
@@ -516,7 +516,7 @@ QList<PlayListTrack *> PlayListTask::takeResults(PlayListTrack **current_track)
     else if(m_task == REMOVE_INVALID || m_task == REMOVE_DUPLICATES || m_task == REFRESH)
     {
         int index = 0;
-        PlayListTrack *t = 0;
+        PlayListTrack *t = nullptr;
         for (int i = m_indexes.count() - 1; i >= 0; i--)
         {
             index = m_indexes.at(i);
@@ -524,7 +524,7 @@ QList<PlayListTrack *> PlayListTask::takeResults(PlayListTrack **current_track)
             if(t == m_current_track)
             {
                 if(m_tracks.isEmpty())
-                    m_current_track = 0;
+                    m_current_track = nullptr;
                 else if(index > 0 && index <= m_tracks.count())
                     m_current_track = m_tracks[index - 1];
                 else
@@ -566,5 +566,5 @@ void PlayListTask::clear()
     m_indexes.clear();
     m_input_tracks.clear();
     m_tracks.clear();
-    m_current_track = 0;
+    m_current_track = nullptr;
 }
diff --git a/src/qmmpui/qmmpuiplugincache.cpp b/src/qmmpui/qmmpuiplugincache.cpp
index ed739168d..126dcb650 100644
--- a/src/qmmpui/qmmpuiplugincache.cpp
+++ b/src/qmmpui/qmmpuiplugincache.cpp
@@ -33,10 +33,10 @@
 QmmpUiPluginCache::QmmpUiPluginCache(const QString &file, QSettings *settings)
 {
     m_error = false;
-    m_instance = 0;
-    m_generalFactory = 0;
-    m_uiFactory = 0;
-    m_fileDialogFactory = 0;
+    m_instance = nullptr;
+    m_generalFactory = nullptr;
+    m_uiFactory = nullptr;
+    m_fileDialogFactory = nullptr;
     m_priority = 0;
     bool update = false;
     QFileInfo info(file);
@@ -105,9 +105,9 @@ QmmpUiPluginCache::QmmpUiPluginCache(QObject *instance)
 {
     m_error = false;
     m_instance = instance;
-    m_generalFactory = 0;
-    m_uiFactory = 0;
-    m_fileDialogFactory = 0;
+    m_generalFactory = nullptr;
+    m_uiFactory = nullptr;
+    m_fileDialogFactory = nullptr;
     m_priority = 0;
 
     if(GeneralFactory *factory = generalFactory())
@@ -190,7 +190,7 @@ FileDialogFactory *QmmpUiPluginCache::fileDialogFactory()
 QObject *QmmpUiPluginCache::instance()
 {
     if(m_error)
-        return 0;
+        return nullptr;
     if(m_instance)
         return m_instance;
     QPluginLoader loader(m_path);
diff --git a/src/qmmpui/qmmpuisettings.cpp b/src/qmmpui/qmmpuisettings.cpp
index 561e6c496..dfb0d9c0d 100644
--- a/src/qmmpui/qmmpuisettings.cpp
+++ b/src/qmmpui/qmmpuisettings.cpp
@@ -26,7 +26,7 @@
 #include "playlistmanager.h"
 #include "qmmpuisettings.h"
 
-QmmpUiSettings *QmmpUiSettings::m_instance = 0;
+QmmpUiSettings *QmmpUiSettings::m_instance = nullptr;
 
 QmmpUiSettings::QmmpUiSettings(QObject *parent) : QObject(parent)
 {
@@ -67,7 +67,7 @@ QmmpUiSettings::QmmpUiSettings(QObject *parent) : QObject(parent)
 
 QmmpUiSettings::~QmmpUiSettings()
 {
-    m_instance = 0;
+    m_instance = nullptr;
     sync();
     delete m_helper;
 }
diff --git a/src/qmmpui/qmmpuisettings.h b/src/qmmpui/qmmpuisettings.h
index 36e0f930a..fb137358c 100644
--- a/src/qmmpui/qmmpuisettings.h
+++ b/src/qmmpui/qmmpuisettings.h
@@ -42,7 +42,7 @@ public:
      * @param parent Parent object.
      * This functions is for internal usage only, use QmmpSettings::instance() instead.
      */
-    explicit QmmpUiSettings(QObject *parent = 0);
+    explicit QmmpUiSettings(QObject *parent = nullptr);
     /*!
      * Destructor.
      */
diff --git a/src/qmmpui/radioitemdelegate_p.h b/src/qmmpui/radioitemdelegate_p.h
index 1b0887554..b99e13472 100644
--- a/src/qmmpui/radioitemdelegate_p.h
+++ b/src/qmmpui/radioitemdelegate_p.h
@@ -33,7 +33,7 @@ class RadioItemDelegate : public QStyledItemDelegate
 {
     Q_OBJECT
 public:
-    explicit RadioItemDelegate(QObject *parent = 0);
+    explicit RadioItemDelegate(QObject *parent = nullptr);
 
     void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const;
     QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const;
diff --git a/src/qmmpui/tageditor_p.h b/src/qmmpui/tageditor_p.h
index c4ffd0f94..1e332086c 100644
--- a/src/qmmpui/tageditor_p.h
+++ b/src/qmmpui/tageditor_p.h
@@ -36,7 +36,7 @@ class TagEditor : public QWidget
 {
 Q_OBJECT
 public:
-    TagEditor(TagModel *tagModel, QWidget *parent = 0);
+    TagEditor(TagModel *tagModel, QWidget *parent = nullptr);
     ~TagEditor();
 
     void save();
diff --git a/src/qmmpui/tagupdater.cpp b/src/qmmpui/tagupdater.cpp
index 50f0f926c..bb0ca4bfa 100644
--- a/src/qmmpui/tagupdater.cpp
+++ b/src/qmmpui/tagupdater.cpp
@@ -37,7 +37,7 @@ void TagUpdater::updateTags()
         if (!t->isUsed() && t->isSheduledForDeletion())
         {
             delete t;
-            t = 0;
+            t = nullptr;
         }
         else
         {
diff --git a/src/qmmpui/templateeditor.h b/src/qmmpui/templateeditor.h
index 5e769f0e4..51dc453a0 100644
--- a/src/qmmpui/templateeditor.h
+++ b/src/qmmpui/templateeditor.h
@@ -39,7 +39,7 @@ public:
      * Constructor.
      * @param parent Parent widget.
      */
-    explicit TemplateEditor(QWidget *parent = 0);
+    explicit TemplateEditor(QWidget *parent = nullptr);
     /*!
      * Returns current template from editor.
      */
@@ -62,7 +62,7 @@ public:
      * @param ok This varible will be set to \b true (\b false) if the user pressed OK (Cancel).
      */
     static QString getTemplate (QWidget *parent, const QString &title, const QString &text = QString(),
-                                const QString &default_template = QString(), bool *ok = 0);
+                                const QString &default_template = QString(), bool *ok = nullptr);
 
 private slots:
     void on_resetButton_clicked();
diff --git a/src/qmmpui/uihelper.cpp b/src/qmmpui/uihelper.cpp
index 1d965a9b6..6f3a37415 100644
--- a/src/qmmpui/uihelper.cpp
+++ b/src/qmmpui/uihelper.cpp
@@ -38,14 +38,14 @@
 #include "mediaplayer.h"
 #include "uihelper.h"
 
-UiHelper *UiHelper::m_instance = 0;
+UiHelper *UiHelper::m_instance = nullptr;
 
 UiHelper::UiHelper(QObject *parent)
         : QObject(parent)
 {
     m_instance = this;
-    m_jumpDialog = 0;
-    m_model = 0;
+    m_jumpDialog = nullptr;
+    m_model = nullptr;
     General::create(parent);
     QSettings settings(Qmmp::configFile(), QSettings::IniFormat);
     m_lastDir = settings.value("General/last_dir", QDir::homePath()).toString(); //last directory
diff --git a/src/qmmpui/uihelper.h b/src/qmmpui/uihelper.h
index 2ba17cc27..6594e1adb 100644
--- a/src/qmmpui/uihelper.h
+++ b/src/qmmpui/uihelper.h
@@ -49,7 +49,7 @@ public:
      * Object constructor,
      * @param parent Parent object
      */
-    UiHelper(QObject *parent = 0);
+    UiHelper(QObject *parent = nullptr);
     /*!
      * Destructor
      */
@@ -88,14 +88,14 @@ public:
      * @param title Menu title.
      * @param parent Parent widget
      */
-    QMenu *createMenu(MenuType type, const QString &title = QString(), QWidget *parent = 0);
+    QMenu *createMenu(MenuType type, const QString &title = QString(), QWidget *parent = nullptr);
     /*!
      * Registers existing menu for access from general plugins.
      * @param type Menu type.
      * @param menu Menu pointer.
      * @param before An action, after which the rest are added.
      */
-    void registerMenu(MenuType type, QMenu *menu, QAction *before = 0);
+    void registerMenu(MenuType type, QMenu *menu, QAction *before = nullptr);
     /*!
      * Opens 'Add Files' dialog
      * @param parent Parent widget
@@ -149,7 +149,7 @@ public:
      * Shows about dialog
      * @param parent Parent widget
      */
-    void about(QWidget *parent = 0);
+    void about(QWidget *parent = nullptr);
     /*!
      * Returns a pointer to the object's instance.
      */
diff --git a/src/qmmpui/uiloader.cpp b/src/qmmpui/uiloader.cpp
index 1c742d587..b144e6c40 100644
--- a/src/qmmpui/uiloader.cpp
+++ b/src/qmmpui/uiloader.cpp
@@ -23,7 +23,7 @@
 #include "qmmpuiplugincache_p.h"
 #include "uiloader.h"
 
-QList<QmmpUiPluginCache*> *UiLoader::m_cache = 0;
+QList<QmmpUiPluginCache*> *UiLoader::m_cache = nullptr;
 
 void UiLoader::loadPlugins()
 {
@@ -113,5 +113,5 @@ UiFactory *UiLoader::selected()
     }
     if (!m_cache->isEmpty())
         return m_cache->at(0)->uiFactory();
-    return 0;
+    return nullptr;
 }
diff --git a/src/qmmpui/winfileassocpage_p.h b/src/qmmpui/winfileassocpage_p.h
index 3eecc5489..9ba234084 100644
--- a/src/qmmpui/winfileassocpage_p.h
+++ b/src/qmmpui/winfileassocpage_p.h
@@ -37,7 +37,7 @@ class QMMPUI_EXPORT WinFileAssocPage : public QWidget
 {
     Q_OBJECT
 public:
-    WinFileAssocPage(QWidget *parent = 0);
+    WinFileAssocPage(QWidget *parent = nullptr);
     virtual ~WinFileAssocPage();