Used for recording media content from a camera device. More...

Inheritance diagram for QCameraImageCapture:

Public Typedefs
using	CaptureDestinations = QFlags< CaptureDestination >

Public Types
enum	CaptureDestination

enum	DriveMode

enum	Error

Public Signals
void	bufferFormatChanged (QVideoFrame::PixelFormat format)

void	captureDestinationChanged (QCameraImageCapture::CaptureDestinations destination)

void	error (int id, QCameraImageCapture::Error error, const QString &errorString)

void	imageAvailable (int id, const QVideoFrame &buffer)

void	imageCaptured (int id, const QImage &preview)

void	imageExposed (int id)

void	imageMetadataAvailable (int id, const QString &key, const QVariant &value)

void	imageSaved (int id, const QString &fileName)

void	readyForCaptureChanged (bool ready)

Public Signals inherited from QObject
void	destroyed (QObject *obj=nullptr)

void	objectNameChanged (const QString &objectName)

Public Slots
void	cancelCapture ()

int	capture (const QString &fileName=QString ())

Public Slots inherited from QObject
void	deleteLater ()

Public Methods
	QCameraImageCapture (QMediaObject mediaObject, QObject parent=nullptr)

	~QCameraImageCapture ()

QMultimedia::AvailabilityStatus	availability () const

QVideoFrame::PixelFormat	bufferFormat () const

CaptureDestinations	captureDestination () const

QImageEncoderSettings	encodingSettings () const

Error	error () const

QString	errorString () const

QString	imageCodecDescription (const QString &codecName) const

bool	isAvailable () const

bool	isCaptureDestinationSupported (CaptureDestinations destination) const

bool	isReadyForCapture () const

QMediaObject *	mediaObject () const override

void	setBufferFormat (const QVideoFrame::PixelFormat format)

void	setCaptureDestination (CaptureDestinations destination)

void	setEncodingSettings (const QImageEncoderSettings &settings)

QList< QVideoFrame::PixelFormat >	supportedBufferFormats () const

QStringList	supportedImageCodecs () const

QList< QSize >	supportedResolutions (const QImageEncoderSettings &settings=QImageEncoderSettings (), bool *continuous=nullptr) const

Public Methods inherited from QObject
	QObject (QObject *parent=nullptr)

	~QObject ()

bool	blockSignals (bool block)

const QList< QObject * > &	children () const

bool	connect (const QObject *sender, const QString &signalMethod, const QString &location, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

bool	connect (const QObject *sender, const QString &signalMethod, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

bool	disconnect (const QObject *receiver, const QString &slotMethod=QString ()) const

bool	disconnect (const QString &signalMethod, const QString &location, const QObject *receiver=nullptr, const QString &slotMethod=QString ()) const

bool	disconnect (const QString &signalMethod=QString (), const QObject *receiver=nullptr, const QString &slotMethod=QString ()) const

void	dumpObjectInfo ()

void	dumpObjectTree ()

QList< QString >	dynamicPropertyNames () const

virtual bool	event (QEvent *event)

virtual bool	eventFilter (QObject watched, QEvent event)

template<typename T >
T	findChild (const QString &childName=QString ()) const

template<class T >
QList< T >	findChildren (const QRegularExpression &regExp, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const

template<class T >
QList< T >	findChildren (const QString &childName=QString (), Qt::FindChildOptions options=Qt::FindChildrenRecursively) const

bool	inherits (const QString &className) const

void	installEventFilter (QObject *filterObj)

bool	isWidgetType () const

bool	isWindowType () const

void	killTimer (int id)

const QMetaObject *	metaObject () const

void	moveToThread (QThread *targetThread)

QString	objectName () const

QObject *	parent () const

template<class T = QVariant>
T	property (const QString &name) const

void	removeEventFilter (QObject *obj)

void	setObjectName (const QString &name)

void	setParent (QObject *parent)

bool	setProperty (const QString &name, const QVariant &value)

bool	signalsBlocked () const

int	startTimer (int interval, Qt::TimerType timerType=Qt::CoarseTimer)

QThread *	thread () const

Public Methods inherited from QMediaBindableInterface
virtual	~QMediaBindableInterface ()

Protected Methods
bool	setMediaObject (QMediaObject *mediaObject) override

Protected Methods inherited from QObject
virtual void	childEvent (QChildEvent *event)

virtual void	connectNotify (const QMetaMethod &signalMethod) const

virtual void	customEvent (QEvent *event)

virtual void	disconnectNotify (const QMetaMethod &signalMethod) const

bool	isSignalConnected (const QMetaMethod &signalMethod) const

int	receivers (const QString &signal) const

QObject *	sender () const

int	senderSignalIndex () const

virtual void	timerEvent (QTimerEvent *event)

Properties
	readyForCapture

Properties inherited from QObject
	objectName

Additional Inherited Members
Static Public Methods inherited from QObject
static bool	connect (const QObject sender, const QMetaMethod &signalMethod, const QObject receiver, const QMetaMethod &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

static bool	connect (const QObject sender, const QString &signalMethod, const QObject receiver, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection, const QString &location=QString ())

static bool	connect (const QObject sender, const QString &signalMethod, const QString &location, const QObject receiver, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class SlotClass , class... SlotArgs, class SlotReturn >
static bool	connect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver receiver, SlotReturn (SlotClass::slotMethod)(SlotArgs...), Qt::ConnectionType type=Qt::AutoConnection)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class T >
static bool	connect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver *receiver, T slotLambda, Qt::ConnectionType type=Qt::AutoConnection)

static bool	disconnect (const QObject sender, const QMetaMethod &signalMethod, const QObject receiver, const QMetaMethod &slotMethod)

static bool	disconnect (const QObject sender, const QString &signalMethod, const QObject receiver, const QString &slotMethod)

static bool	disconnect (const QObject sender, const QString &signalMethod, const QString &location, const QObject receiver, const QString &slotMethod)

static bool	disconnect (const QObject sender, std::nullptr_t, const QObject receiver, std::nullptr_t)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class SlotClass , class... SlotArgs, class SlotReturn >
static bool	disconnect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver receiver, SlotReturn (SlotClass::slotMethod)(SlotArgs...))

template<class Sender , class SignalClass , class... SignalArgs, class Receiver >
static bool	disconnect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver *receiver, std::nullptr_t slotMethod=nullptr)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class T >
static bool	disconnect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver *receiver, T slotMethod)

static QMetaObject &	staticMetaObject ()

static QString	tr (const char text, const char comment=nullptr, std::optional< int > numArg=std::optional< int >())

Related Functions inherited from QObject
T	qobject_cast (QObject *object)

	QObjectList

Detailed Description

The QCameraImageCapture class is used for recording media content from a camera device. This class is used with the media recording functions of other media objects like QCamera.

camera = new QCamera;
 
viewfinder = new QCameraViewfinder();
viewfinder->show();
 
camera->setViewfinder(viewfinder);
 
imageCapture = new QCameraImageCapture(camera);
 
camera->setCaptureMode(QCamera::CaptureStillImage);
camera->start();
 
// on half pressed shutter button
camera->searchAndLock();
 
// on shutter button pressed
imageCapture->capture();
 
// on shutter button released
camera->unlock();

See also: QCamera

Member Typedef Documentation

QCameraImageCapture::CaptureDestinations

Typedef for QFlags<CaptureDestination>. Refer to QCameraImageCapture::CaptureDestination for documentation.

Member Enumeration Documentation

enum QCameraImageCapture::CaptureDestination

Values indicating where a captured image will be stored.

Constant	Value	Description
QCameraImageCapture::CaptureToFile	0x01	Capture the image to a file.
QCameraImageCapture::CaptureToBuffer	0x02	Capture the image to a buffer for further processing.

enum QCameraImageCapture::DriveMode

Value for the image capture sequencing mode.

Constant	Value	Description
QCameraImageCapture::SingleImageCapture	0	Drive mode is capturing a single picture.

enum QCameraImageCapture::Error

List of values describing a capture error.

Constant	Value	Description
QCameraImageCapture::NoError	0	No Errors.
QCameraImageCapture::NotReadyError	1	The service is not ready for capture yet.
QCameraImageCapture::ResourceError	2	Device is not ready or not available.
QCameraImageCapture::OutOfSpaceError	3	No space left on device.
QCameraImageCapture::NotSupportedFeatureError	4	Device does not support still image capture.
QCameraImageCapture::FormatError	5	Current format is not supported.

Constructor & Destructor Documentation

QCameraImageCapture::QCameraImageCapture	(	QMediaObject *	mediaObject,
		QObject *	parent = `nullptr`
	)

explicit

Constructs a QCameraImageCapture object using mediaObject and parent.

Constructs a QCameraImageCapture using mediaObject and parent.

QCameraImageCapture::~QCameraImageCapture ( )

Destroys this image capture object.

Method Documentation

QMultimedia::AvailabilityStatus QCameraImageCapture::availability ( ) const

Returns the availability of this object.

Returns the availability of this functionality.

QVideoFrame::PixelFormat QCameraImageCapture::bufferFormat ( ) const

Returns the buffer image capture format being used.

See also: supportedBufferFormats(), setBufferFormat()

void QCameraImageCapture::bufferFormatChanged ( QVideoFrame::PixelFormat format )

signal

Signal emitted when the buffer format for the buffer image capture has changed.

void QCameraImageCapture::cancelCapture ( )

slot

Cancel incomplete capture requests. Already captured and queued for processing images may be discarded.

int QCameraImageCapture::capture ( const QString & fileName = QString() )

slot

Capture the image and save it to fileName. This operation is asynchronous in majority of cases, followed by signals QCameraImageCapture::imageExposed(), QCameraImageCapture::imageCaptured(), QCameraImageCapture::imageSaved() or QCameraImageCapture::error().

If an empty file is passed, the camera backend chooses the default location and naming scheme for photos on the system, if only file name without full path is specified, the image will be saved to the default directory, with a full path reported with imageCaptured() and imageSaved() signals.

QCamera saves all the capture parameters like exposure settings or image processing parameters, so changes to camera parameters after capture() is called do not affect previous capture requests.

QCameraImageCapture::capture returns the capture Id parameter, used with imageExposed(), imageCaptured() and imageSaved() signals.

See also: isReadyForCapture()

Capture the image and save it to the given fileName. This operation is asynchronous in majority of cases, followed by signals QCameraImageCapture::imageExposed(), QCameraImageCapture::imageCaptured(), QCameraImageCapture::imageSaved() or QCameraImageCapture::error().

If an empty file is passed, the camera backend chooses the default location and naming scheme for photos on the system, if only file name without full path is specified, the image will be saved to the default directory, with a full path reported with imageCaptured() and imageSaved() signals.

QCamera saves all the capture parameters like exposure settings or image processing parameters, so changes to camera parameters after capture() is called do not affect previous capture requests.

QCameraImageCapture::capture returns the capture Id parameter, used with imageExposed(), imageCaptured() and imageSaved() signals.

See also: isReadyForCapture()

CaptureDestinations QCameraImageCapture::captureDestination ( ) const

Returns the image captureDdestination being used.

See also: isCaptureDestinationSupported(), setCaptureDestination()

Returns the image capture destination being used.

See also: isCaptureDestinationSupported(), setCaptureDestination()

void QCameraImageCapture::captureDestinationChanged ( QCameraImageCapture::CaptureDestinations destination )

signal

Signal emitted when the capture destination has changed.

Signal emitted when the capture destination has changed.

QImageEncoderSettings QCameraImageCapture::encodingSettings ( ) const

Returns the image encoder settings being used.

See also: setEncodingSettings()

Error QCameraImageCapture::error ( ) const

Returns the current error state.

See also: errorString()

void QCameraImageCapture::error	(	int	id,
		QCameraImageCapture::Error	error,
		const QString &	errorString
	)

signal

This signal indicates the capture request with the given id has failed with an error and the errorString description.

Signals the capture request id failed with the given error code and message errorString.

QString QCameraImageCapture::errorString ( ) const

Returns a string describing the current error state.

See also: error()

void QCameraImageCapture::imageAvailable	(	int	id,
		const QVideoFrame &	buffer
	)

signal

This signal indicates the capture request with the given id is available in buffer.

Signal emitted when the frame with request id is available as buffer.

void QCameraImageCapture::imageCaptured	(	int	id,
		const QImage &	preview
	)

signal

This signal indicates the capture request with the given id was captured however it has not yet been processed and saved. The preview image can be displayed.

This signal indicates that an image with a given requestId has been captured and a preview is available.

QString QCameraImageCapture::imageCodecDescription ( const QString & codecName ) const

Returns a description of an image codecName.

void QCameraImageCapture::imageExposed ( int id )

signal

This signal indicates the capture request with the given id has been exposed.

Signal emitted when the frame with request id was exposed.

void QCameraImageCapture::imageMetadataAvailable	(	int	id,
		const QString &	key,
		const QVariant &	value
	)

signal

This signal indicates the capture request with the given id will contain metadata consisting of a key and a value.

This signal is emitted between the imageExposed and imageSaved signals.

Signals the metadata for an image with the requested id is available. The key and value contain the metadata. This signal should be emitted between imageExposed and imageSaved signals.

void QCameraImageCapture::imageSaved	(	int	id,
		const QString &	fileName
	)

signal

This signal indicates the capture request with the given id was saved to fileName.

Signal emitted when the frame with request id was saved to fileName.

bool QCameraImageCapture::isAvailable ( ) const

Returns true if the image capture service is ready to use.

Returns true if the images capture service ready to use.

bool QCameraImageCapture::isCaptureDestinationSupported ( CaptureDestinations destination ) const

Returns true if the image capture destination is supported otherwise returns false.

See also: captureDestination(), setCaptureDestination()

bool QCameraImageCapture::isReadyForCapture ( ) const

Returns true if the image capture service is ready to capture an image.

QMediaObject * QCameraImageCapture::mediaObject ( ) const

overridevirtual

See also: setMediaObject()

Implements QMediaBindableInterface::mediaObject()

void QCameraImageCapture::readyForCaptureChanged ( bool ready )

signal

This signal indicates the readyForCapture property has changed to ready.

Signals a camera's ready for capture state has changed.

void QCameraImageCapture::setBufferFormat ( const QVideoFrame::PixelFormat format )

Sets the buffer image capture format to be used.

See also: bufferFormat(), supportedBufferFormats(), captureDestination()

void QCameraImageCapture::setCaptureDestination ( CaptureDestinations destination )

Sets the capture destination to be used.

See also: isCaptureDestinationSupported(), captureDestination()

void QCameraImageCapture::setEncodingSettings ( const QImageEncoderSettings & settings )

Sets the image encoding to settings. If some parameters are not specified the encoder defaults will be used.

See also: encodingSettings()

Sets the image encoding settings. If some parameters are not specified, or null settings are passed, the encoder choose the default encoding parameters.

See also: encodingSettings()

bool QCameraImageCapture::setMediaObject ( QMediaObject * mediaObject )

overrideprotectedvirtual

See also: mediaObject()

Implements QMediaBindableInterface::setMediaObject()

QList< QVideoFrame::PixelFormat > QCameraImageCapture::supportedBufferFormats ( ) const

Returns the list of supported buffer image capture formats.

See also: bufferFormat(), setBufferFormat()

QStringList QCameraImageCapture::supportedImageCodecs ( ) const

Returns a list of supported image codecs.

QList< QSize > QCameraImageCapture::supportedResolutions	(	const QImageEncoderSettings &	settings = `QImageEncoderSettings()`,
		bool *	continuous = `nullptr`
	)		const

Returns a list of supported image resolutions. If the settings parameter is not empty only compatible resolutions will be returned. If the encoder supports arbitrary resolutions within the supported range, continuous is set to true otherwise continuous is set to false.

See also: QImageEncoderSettings::resolution()

Returns a list of resolutions images can be encoded at. If non null image settings parameter is passed, the returned list is reduced to resolution supported with partial settings like image codec or quality applied.

If the encoder supports arbitrary resolutions within the supported range, continuous is set to true otherwise continuous is set to false.

See also: QImageEncoderSettings::resolution()

Property Documentation

QCameraImageCapture::readyForCapture

This property will be true when the service is ready to capture an image. Calling capture() while this property is false results in an error.

Properties	Class Methods
read	isReadyForCapture
notify	readyForCaptureChanged

Public Typedefs

Public Types

Public Signals

Public Slots

Public Methods

Protected Methods

Properties

Additional Inherited Members

Detailed Description

Member Typedef Documentation

Member Enumeration Documentation

Constructor & Destructor Documentation

Method Documentation

Property Documentation