Add explicit and make public headers compile with -Wzero-as-null-pointer-constant

... or equivalent.

QtBase 5.6 headers already compile that way, so let the other
modules follow suit.

Cleaned up placement of * and & in parameters as a drive-by.

Added explicit where it was missing as a drive-by. This is
not a source-incompatible change, because code that breaks
by this is a bug. Let's not have this sitting around in an LTS.

Task-number: QTBUG-45291
Change-Id: If81ed0c71393aee21d347f5ade4bf3fcc07cd82f
Reviewed-by: Yoann Lopes <yoann.lopes@theqtcompany.com>

36 files changed, 41 insertions, 41 deletions

diff --git a/src/multimedia/controls/qaudiodecodercontrol.h b/src/multimedia/controls/qaudiodecodercontrol.h
index f319f7414..2d5912165 100644
--- a/src/multimedia/controls/qaudiodecodercontrol.h
+++ b/src/multimedia/controls/qaudiodecodercontrol.h
@@ -86,7 +86,7 @@ Q_SIGNALS:
     void durationChanged(qint64 duration);
 
 protected:
-    QAudioDecoderControl(QObject* parent = 0);
+    explicit QAudioDecoderControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QAudioDecoderControl_iid "org.qt-project.qt.audiodecodercontrol/5.0"
diff --git a/src/multimedia/controls/qaudioencodersettingscontrol.h b/src/multimedia/controls/qaudioencodersettingscontrol.h
index ebaf92333..e17377f40 100644
--- a/src/multimedia/controls/qaudioencodersettingscontrol.h
+++ b/src/multimedia/controls/qaudioencodersettingscontrol.h
@@ -61,13 +61,13 @@ public:
     virtual QString codecDescription(const QString &codecName) const = 0;
 
     virtual QList<int> supportedSampleRates(const QAudioEncoderSettings &settings,
-                                            bool *continuous = 0) const = 0;
+                                            bool *continuous = Q_NULLPTR) const = 0;
 
     virtual QAudioEncoderSettings audioSettings() const = 0;
     virtual void setAudioSettings(const QAudioEncoderSettings&) = 0;
 
 protected:
-    QAudioEncoderSettingsControl(QObject *parent = 0);
+    explicit QAudioEncoderSettingsControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QAudioEncoderSettingsControl_iid "org.qt-project.qt.audioencodersettingscontrol/5.0"
diff --git a/src/multimedia/controls/qaudioinputselectorcontrol.h b/src/multimedia/controls/qaudioinputselectorcontrol.h
index d37481243..ebed8002e 100644
--- a/src/multimedia/controls/qaudioinputselectorcontrol.h
+++ b/src/multimedia/controls/qaudioinputselectorcontrol.h
@@ -62,7 +62,7 @@ Q_SIGNALS:
     void availableInputsChanged();
 
 protected:
-    QAudioInputSelectorControl(QObject *parent = 0);
+    explicit QAudioInputSelectorControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QAudioInputSelectorControl_iid "org.qt-project.qt.audioinputselectorcontrol/5.0"
diff --git a/src/multimedia/controls/qaudiooutputselectorcontrol.h b/src/multimedia/controls/qaudiooutputselectorcontrol.h
index 132d90d7d..3abfd1571 100644
--- a/src/multimedia/controls/qaudiooutputselectorcontrol.h
+++ b/src/multimedia/controls/qaudiooutputselectorcontrol.h
@@ -62,7 +62,7 @@ Q_SIGNALS:
     void availableOutputsChanged();
 
 protected:
-    QAudioOutputSelectorControl(QObject *parent = 0);
+    explicit QAudioOutputSelectorControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QAudioOutputSelectorControl_iid "org.qt-project.qt.audiooutputselectorcontrol/5.0"
diff --git a/src/multimedia/controls/qaudiorolecontrol.h b/src/multimedia/controls/qaudiorolecontrol.h
index 983b2aed0..1ae1378c8 100644
--- a/src/multimedia/controls/qaudiorolecontrol.h
+++ b/src/multimedia/controls/qaudiorolecontrol.h
@@ -58,7 +58,7 @@ Q_SIGNALS:
     void audioRoleChanged(QAudio::Role role);
 
 protected:
-    explicit QAudioRoleControl(QObject *parent = 0);
+    explicit QAudioRoleControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QAudioRoleControl_iid "org.qt-project.qt.audiorolecontrol/5.6"
diff --git a/src/multimedia/controls/qcameracapturebufferformatcontrol.h b/src/multimedia/controls/qcameracapturebufferformatcontrol.h
index 2f699c651..8be7f36c5 100644
--- a/src/multimedia/controls/qcameracapturebufferformatcontrol.h
+++ b/src/multimedia/controls/qcameracapturebufferformatcontrol.h
@@ -56,7 +56,7 @@ Q_SIGNALS:
     void bufferFormatChanged(QVideoFrame::PixelFormat);
 
 protected:
-    QCameraCaptureBufferFormatControl(QObject* parent = 0);
+    explicit QCameraCaptureBufferFormatControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QCameraCaptureBufferFormatControl_iid "org.qt-project.qt.cameracapturebufferformatcontrol/5.0"
diff --git a/src/multimedia/controls/qcameracapturedestinationcontrol.h b/src/multimedia/controls/qcameracapturedestinationcontrol.h
index efe7f0234..a5238add4 100644
--- a/src/multimedia/controls/qcameracapturedestinationcontrol.h
+++ b/src/multimedia/controls/qcameracapturedestinationcontrol.h
@@ -56,7 +56,7 @@ Q_SIGNALS:
     void captureDestinationChanged(QCameraImageCapture::CaptureDestinations);
 
 protected:
-    QCameraCaptureDestinationControl(QObject* parent = 0);
+    explicit QCameraCaptureDestinationControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QCameraCaptureDestinationControl_iid "org.qt-project.qt.cameracapturedestinationcontrol/5.0"
diff --git a/src/multimedia/controls/qcameracontrol.h b/src/multimedia/controls/qcameracontrol.h
index ec7c2017c..6b1cc9f30 100644
--- a/src/multimedia/controls/qcameracontrol.h
+++ b/src/multimedia/controls/qcameracontrol.h
@@ -77,7 +77,7 @@ Q_SIGNALS:
     void captureModeChanged(QCamera::CaptureModes);
 
 protected:
-    QCameraControl(QObject* parent = 0);
+    explicit QCameraControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QCameraControl_iid "org.qt-project.qt.cameracontrol/5.0"
diff --git a/src/multimedia/controls/qcameraexposurecontrol.h b/src/multimedia/controls/qcameraexposurecontrol.h
index 6f7ef4698..b905d378f 100644
--- a/src/multimedia/controls/qcameraexposurecontrol.h
+++ b/src/multimedia/controls/qcameraexposurecontrol.h
@@ -81,7 +81,7 @@ Q_SIGNALS:
     void parameterRangeChanged(int parameter);
 
 protected:
-    QCameraExposureControl(QObject* parent = 0);
+    explicit QCameraExposureControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QCameraExposureControl_iid "org.qt-project.qt.cameraexposurecontrol/5.0"
diff --git a/src/multimedia/controls/qcamerafeedbackcontrol.h b/src/multimedia/controls/qcamerafeedbackcontrol.h
index 44ba9dda1..d256e52ad 100644
--- a/src/multimedia/controls/qcamerafeedbackcontrol.h
+++ b/src/multimedia/controls/qcamerafeedbackcontrol.h
@@ -78,7 +78,7 @@ public:
     virtual bool setEventFeedbackSound(EventType, const QString &filePath) = 0;
 
 protected:
-    QCameraFeedbackControl(QObject* parent = 0);
+    explicit QCameraFeedbackControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QCameraFeedbackControl_iid "org.qt-project.qt.camerafeedbackcontrol/5.0"
diff --git a/src/multimedia/controls/qcameraflashcontrol.h b/src/multimedia/controls/qcameraflashcontrol.h
index 653321e36..d00b7356a 100644
--- a/src/multimedia/controls/qcameraflashcontrol.h
+++ b/src/multimedia/controls/qcameraflashcontrol.h
@@ -62,7 +62,7 @@ Q_SIGNALS:
     void flashReady(bool);
 
 protected:
-    QCameraFlashControl(QObject* parent = 0);
+    explicit QCameraFlashControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QCameraFlashControl_iid "org.qt-project.qt.cameraflashcontrol/5.0"
diff --git a/src/multimedia/controls/qcamerafocuscontrol.h b/src/multimedia/controls/qcamerafocuscontrol.h
index 868f5e493..3562fb8e2 100644
--- a/src/multimedia/controls/qcamerafocuscontrol.h
+++ b/src/multimedia/controls/qcamerafocuscontrol.h
@@ -71,7 +71,7 @@ Q_SIGNALS:
     void focusZonesChanged();
 
 protected:
-    QCameraFocusControl(QObject* parent = 0);
+    explicit QCameraFocusControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QCameraFocusControl_iid "org.qt-project.qt.camerafocuscontrol/5.0"
diff --git a/src/multimedia/controls/qcameraimagecapturecontrol.h b/src/multimedia/controls/qcameraimagecapturecontrol.h
index 93ec9a7da..bd8e31c84 100644
--- a/src/multimedia/controls/qcameraimagecapturecontrol.h
+++ b/src/multimedia/controls/qcameraimagecapturecontrol.h
@@ -74,7 +74,7 @@ Q_SIGNALS:
     void error(int id, int error, const QString &errorString);
 
 protected:
-    QCameraImageCaptureControl(QObject* parent = 0);
+    explicit QCameraImageCaptureControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QCameraImageCaptureControl_iid "org.qt-project.qt.cameraimagecapturecontrol/5.0"
diff --git a/src/multimedia/controls/qcameraimageprocessingcontrol.h b/src/multimedia/controls/qcameraimageprocessingcontrol.h
index 01686dc46..d0a1c16b3 100644
--- a/src/multimedia/controls/qcameraimageprocessingcontrol.h
+++ b/src/multimedia/controls/qcameraimageprocessingcontrol.h
@@ -76,7 +76,7 @@ public:
     virtual void setParameter(ProcessingParameter parameter, const QVariant &value) = 0;
 
 protected:
-    QCameraImageProcessingControl(QObject* parent = 0);
+    explicit QCameraImageProcessingControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QCameraImageProcessingControl_iid "org.qt-project.qt.cameraimageprocessingcontrol/5.0"
diff --git a/src/multimedia/controls/qcamerainfocontrol.h b/src/multimedia/controls/qcamerainfocontrol.h
index c9a564ea7..acdb30dca 100644
--- a/src/multimedia/controls/qcamerainfocontrol.h
+++ b/src/multimedia/controls/qcamerainfocontrol.h
@@ -52,7 +52,7 @@ public:
     virtual int cameraOrientation(const QString &deviceName) const = 0;
 
 protected:
-    QCameraInfoControl(QObject *parent = 0);
+    explicit QCameraInfoControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QCameraInfoControl_iid "org.qt-project.qt.camerainfocontrol/5.3"
diff --git a/src/multimedia/controls/qcameralockscontrol.h b/src/multimedia/controls/qcameralockscontrol.h
index 421563758..1fe8273b8 100644
--- a/src/multimedia/controls/qcameralockscontrol.h
+++ b/src/multimedia/controls/qcameralockscontrol.h
@@ -61,7 +61,7 @@ Q_SIGNALS:
     void lockStatusChanged(QCamera::LockType type, QCamera::LockStatus status, QCamera::LockChangeReason reason);
 
 protected:
-    QCameraLocksControl(QObject* parent = 0);
+    explicit QCameraLocksControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QCameraLocksControl_iid "org.qt-project.qt.cameralockscontrol/5.0"
diff --git a/src/multimedia/controls/qcameraviewfindersettingscontrol.h b/src/multimedia/controls/qcameraviewfindersettingscontrol.h
index a48ae450e..84fe2d46b 100644
--- a/src/multimedia/controls/qcameraviewfindersettingscontrol.h
+++ b/src/multimedia/controls/qcameraviewfindersettingscontrol.h
@@ -64,7 +64,7 @@ public:
     virtual void setViewfinderParameter(ViewfinderParameter parameter, const QVariant &value) = 0;
 
 protected:
-    QCameraViewfinderSettingsControl(QObject *parent = 0);
+    explicit QCameraViewfinderSettingsControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QCameraViewfinderSettingsControl_iid "org.qt-project.qt.cameraviewfindersettingscontrol/5.0"
@@ -86,7 +86,7 @@ public:
     virtual void setViewfinderSettings(const QCameraViewfinderSettings &settings) = 0;
 
 protected:
-    QCameraViewfinderSettingsControl2(QObject *parent = 0);
+    explicit QCameraViewfinderSettingsControl2(QObject *parent = Q_NULLPTR);
 };
 
 #define QCameraViewfinderSettingsControl2_iid "org.qt-project.qt.cameraviewfindersettingscontrol2/5.5"
diff --git a/src/multimedia/controls/qcamerazoomcontrol.h b/src/multimedia/controls/qcamerazoomcontrol.h
index 07575a25c..f16052c92 100644
--- a/src/multimedia/controls/qcamerazoomcontrol.h
+++ b/src/multimedia/controls/qcamerazoomcontrol.h
@@ -69,7 +69,7 @@ Q_SIGNALS:
     void currentDigitalZoomChanged(qreal digitalZoom);
 
 protected:
-    QCameraZoomControl(QObject* parent = 0);
+    explicit QCameraZoomControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QCameraZoomControl_iid "org.qt-project.qt.camerazoomcontrol/5.0"
diff --git a/src/multimedia/controls/qimageencodercontrol.h b/src/multimedia/controls/qimageencodercontrol.h
index f448754e6..6dccd966e 100644
--- a/src/multimedia/controls/qimageencodercontrol.h
+++ b/src/multimedia/controls/qimageencodercontrol.h
@@ -62,13 +62,13 @@ public:
     virtual QString imageCodecDescription(const QString &codecName) const = 0;
 
     virtual QList<QSize> supportedResolutions(const QImageEncoderSettings &settings,
-                                              bool *continuous = 0) const = 0;
+                                              bool *continuous = Q_NULLPTR) const = 0;
 
     virtual QImageEncoderSettings imageSettings() const = 0;
     virtual void setImageSettings(const QImageEncoderSettings &settings) = 0;
 
 protected:
-    QImageEncoderControl(QObject *parent = 0);
+    explicit QImageEncoderControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QImageEncoderControl_iid "org.qt-project.qt.imageencodercontrol/5.0"
diff --git a/src/multimedia/controls/qmediaaudioprobecontrol.h b/src/multimedia/controls/qmediaaudioprobecontrol.h
index b6961ec94..04ec7aca9 100644
--- a/src/multimedia/controls/qmediaaudioprobecontrol.h
+++ b/src/multimedia/controls/qmediaaudioprobecontrol.h
@@ -50,7 +50,7 @@ Q_SIGNALS:
     void flush();
 
 protected:
-    explicit QMediaAudioProbeControl(QObject *parent = 0);
+    explicit QMediaAudioProbeControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QMediaAudioProbeControl_iid "org.qt-project.qt.mediaaudioprobecontrol/5.0"
diff --git a/src/multimedia/controls/qmediaavailabilitycontrol.h b/src/multimedia/controls/qmediaavailabilitycontrol.h
index 1f788f82f..eddadb441 100644
--- a/src/multimedia/controls/qmediaavailabilitycontrol.h
+++ b/src/multimedia/controls/qmediaavailabilitycontrol.h
@@ -56,7 +56,7 @@ Q_SIGNALS:
     void availabilityChanged(QMultimedia::AvailabilityStatus availability);
 
 protected:
-    QMediaAvailabilityControl(QObject* parent = 0);
+    explicit QMediaAvailabilityControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QMediaAvailabilityControl_iid "org.qt-project.qt.mediaavailabilitycontrol/5.0"
diff --git a/src/multimedia/controls/qmediacontainercontrol.h b/src/multimedia/controls/qmediacontainercontrol.h
index 83b201cdd..ae15967e9 100644
--- a/src/multimedia/controls/qmediacontainercontrol.h
+++ b/src/multimedia/controls/qmediacontainercontrol.h
@@ -56,7 +56,7 @@ public:
     virtual QString containerDescription(const QString &formatMimeType) const = 0;
 
 protected:
-    QMediaContainerControl(QObject *parent = 0);
+    explicit QMediaContainerControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QMediaContainerControl_iid "org.qt-project.qt.mediacontainercontrol/5.0"
diff --git a/src/multimedia/controls/qmediagaplessplaybackcontrol.h b/src/multimedia/controls/qmediagaplessplaybackcontrol.h
index 79bb6168f..9158aed74 100644
--- a/src/multimedia/controls/qmediagaplessplaybackcontrol.h
+++ b/src/multimedia/controls/qmediagaplessplaybackcontrol.h
@@ -60,7 +60,7 @@ Q_SIGNALS:
     void advancedToNextMedia();
 
 protected:
-    QMediaGaplessPlaybackControl(QObject* parent = 0);
+    explicit QMediaGaplessPlaybackControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QMediaGaplessPlaybackControl_iid "org.qt-project.qt.mediagaplessplaybackcontrol/5.0"
diff --git a/src/multimedia/controls/qmedianetworkaccesscontrol.h b/src/multimedia/controls/qmedianetworkaccesscontrol.h
index 2db6b4a60..f70cbedde 100644
--- a/src/multimedia/controls/qmedianetworkaccesscontrol.h
+++ b/src/multimedia/controls/qmedianetworkaccesscontrol.h
@@ -59,7 +59,7 @@ Q_SIGNALS:
     void configurationChanged(const QNetworkConfiguration& configuration);
 
 protected:
-    QMediaNetworkAccessControl(QObject *parent = 0);
+    explicit QMediaNetworkAccessControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QMediaNetworkAccessControl_iid "org.qt-project.qt.medianetworkaccesscontrol/5.0"
diff --git a/src/multimedia/controls/qmediaplayercontrol.h b/src/multimedia/controls/qmediaplayercontrol.h
index 61622aa8e..b8f915a3d 100644
--- a/src/multimedia/controls/qmediaplayercontrol.h
+++ b/src/multimedia/controls/qmediaplayercontrol.h
@@ -104,7 +104,7 @@ Q_SIGNALS:
     void error(int error, const QString &errorString);
 
 protected:
-    QMediaPlayerControl(QObject* parent = 0);
+    explicit QMediaPlayerControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QMediaPlayerControl_iid "org.qt-project.qt.mediaplayercontrol/5.0"
diff --git a/src/multimedia/controls/qmediarecordercontrol.h b/src/multimedia/controls/qmediarecordercontrol.h
index c3afa9b58..58e4d5aa1 100644
--- a/src/multimedia/controls/qmediarecordercontrol.h
+++ b/src/multimedia/controls/qmediarecordercontrol.h
@@ -82,7 +82,7 @@ public Q_SLOTS:
     virtual void setVolume(qreal volume) = 0;
 
 protected:
-    QMediaRecorderControl(QObject* parent = 0);
+    explicit QMediaRecorderControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QMediaRecorderControl_iid "org.qt-project.qt.mediarecordercontrol/5.0"
diff --git a/src/multimedia/controls/qmediastreamscontrol.h b/src/multimedia/controls/qmediastreamscontrol.h
index ca2ad53bc..eee2803c7 100644
--- a/src/multimedia/controls/qmediastreamscontrol.h
+++ b/src/multimedia/controls/qmediastreamscontrol.h
@@ -67,7 +67,7 @@ Q_SIGNALS:
     void activeStreamsChanged();
 
 protected:
-    QMediaStreamsControl(QObject *parent = 0);
+    explicit QMediaStreamsControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QMediaStreamsControl_iid "org.qt-project.qt.mediastreamscontrol/5.0"
diff --git a/src/multimedia/controls/qmediavideoprobecontrol.h b/src/multimedia/controls/qmediavideoprobecontrol.h
index 78f89400d..8a81ab9aa 100644
--- a/src/multimedia/controls/qmediavideoprobecontrol.h
+++ b/src/multimedia/controls/qmediavideoprobecontrol.h
@@ -52,7 +52,7 @@ Q_SIGNALS:
     void flush();
 
 protected:
-    explicit QMediaVideoProbeControl(QObject *parent = 0);
+    explicit QMediaVideoProbeControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QMediaVideoProbeControl_iid "org.qt-project.qt.mediavideoprobecontrol/5.0"
diff --git a/src/multimedia/controls/qmetadatareadercontrol.h b/src/multimedia/controls/qmetadatareadercontrol.h
index 7cf8a5f0d..285e08dd5 100644
--- a/src/multimedia/controls/qmetadatareadercontrol.h
+++ b/src/multimedia/controls/qmetadatareadercontrol.h
@@ -65,7 +65,7 @@ Q_SIGNALS:
     void metaDataAvailableChanged(bool available);
 
 protected:
-    QMetaDataReaderControl(QObject *parent = 0);
+    explicit QMetaDataReaderControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QMetaDataReaderControl_iid "org.qt-project.qt.metadatareadercontrol/5.0"
diff --git a/src/multimedia/controls/qmetadatawritercontrol.h b/src/multimedia/controls/qmetadatawritercontrol.h
index 7b6cef9c4..970feab0c 100644
--- a/src/multimedia/controls/qmetadatawritercontrol.h
+++ b/src/multimedia/controls/qmetadatawritercontrol.h
@@ -68,7 +68,7 @@ Q_SIGNALS:
     void metaDataAvailableChanged(bool available);
 
 protected:
-    QMetaDataWriterControl(QObject *parent = 0);
+    explicit QMetaDataWriterControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QMetaDataWriterControl_iid "org.qt-project.qt.metadatawritercontrol/5.0"
diff --git a/src/multimedia/controls/qradiodatacontrol.h b/src/multimedia/controls/qradiodatacontrol.h
index e519c414e..91fa2a69b 100644
--- a/src/multimedia/controls/qradiodatacontrol.h
+++ b/src/multimedia/controls/qradiodatacontrol.h
@@ -70,7 +70,7 @@ Q_SIGNALS:
     void error(QRadioData::Error err);
 
 protected:
-    QRadioDataControl(QObject *parent = 0);
+    explicit QRadioDataControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QRadioDataControl_iid "org.qt-project.qt.radiodatacontrol/5.0"
diff --git a/src/multimedia/controls/qradiotunercontrol.h b/src/multimedia/controls/qradiotunercontrol.h
index fbcad5167..273120f5a 100644
--- a/src/multimedia/controls/qradiotunercontrol.h
+++ b/src/multimedia/controls/qradiotunercontrol.h
@@ -101,7 +101,7 @@ Q_SIGNALS:
     void antennaConnectedChanged(bool connectionStatus);
 
 protected:
-    QRadioTunerControl(QObject *parent = 0);
+    explicit QRadioTunerControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QRadioTunerControl_iid "org.qt-project.qt.radiotunercontrol/5.0"
diff --git a/src/multimedia/controls/qvideodeviceselectorcontrol.h b/src/multimedia/controls/qvideodeviceselectorcontrol.h
index 840c31efa..655b70dba 100644
--- a/src/multimedia/controls/qvideodeviceselectorcontrol.h
+++ b/src/multimedia/controls/qvideodeviceselectorcontrol.h
@@ -65,7 +65,7 @@ Q_SIGNALS:
     void devicesChanged();
 
 protected:
-    QVideoDeviceSelectorControl(QObject *parent = 0);
+    explicit QVideoDeviceSelectorControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QVideoDeviceSelectorControl_iid "org.qt-project.qt.videodeviceselectorcontrol/5.0"
diff --git a/src/multimedia/controls/qvideoencodersettingscontrol.h b/src/multimedia/controls/qvideoencodersettingscontrol.h
index 8638c3886..7b80cd51f 100644
--- a/src/multimedia/controls/qvideoencodersettingscontrol.h
+++ b/src/multimedia/controls/qvideoencodersettingscontrol.h
@@ -59,10 +59,10 @@ public:
     virtual ~QVideoEncoderSettingsControl();
 
     virtual QList<QSize> supportedResolutions(const QVideoEncoderSettings &settings,
-                                              bool *continuous = 0) const = 0;
+                                              bool *continuous = Q_NULLPTR) const = 0;
 
     virtual QList<qreal> supportedFrameRates(const QVideoEncoderSettings &settings,
-                                             bool *continuous = 0) const = 0;
+                                             bool *continuous = Q_NULLPTR) const = 0;
 
     virtual QStringList supportedVideoCodecs() const = 0;
     virtual QString videoCodecDescription(const QString &codecName) const = 0;
@@ -71,7 +71,7 @@ public:
     virtual void setVideoSettings(const QVideoEncoderSettings &settings) = 0;
 
 protected:
-    QVideoEncoderSettingsControl(QObject *parent = 0);
+    explicit QVideoEncoderSettingsControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QVideoEncoderSettingsControl_iid "org.qt-project.qt.videoencodersettingscontrol/5.0"
diff --git a/src/multimedia/controls/qvideorenderercontrol.h b/src/multimedia/controls/qvideorenderercontrol.h
index 754d83049..132a7cf07 100644
--- a/src/multimedia/controls/qvideorenderercontrol.h
+++ b/src/multimedia/controls/qvideorenderercontrol.h
@@ -50,7 +50,7 @@ public:
     virtual void setSurface(QAbstractVideoSurface *surface) = 0;
 
 protected:
-    QVideoRendererControl(QObject *parent = 0);
+    explicit QVideoRendererControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QVideoRendererControl_iid "org.qt-project.qt.videorenderercontrol/5.0"
diff --git a/src/multimedia/controls/qvideowindowcontrol.h b/src/multimedia/controls/qvideowindowcontrol.h
index c57eef070..ca786dbcd 100644
--- a/src/multimedia/controls/qvideowindowcontrol.h
+++ b/src/multimedia/controls/qvideowindowcontrol.h
@@ -88,7 +88,7 @@ Q_SIGNALS:
     void nativeSizeChanged();
 
 protected:
-    QVideoWindowControl(QObject *parent = 0);
+    explicit QVideoWindowControl(QObject *parent = Q_NULLPTR);
 };
 
 #define QVideoWindowControl_iid "org.qt-project.qt.videowindowcontrol/5.0"