QCameraViewfinderSettingsControl Class

The QCameraViewfinderSettingsControl class provides an abstract class for controlling camera viewfinder parameters. More...

Header:	#include <QCameraViewfinderSettingsControl>
qmake:	QT += multimedia
Inherits:	QMediaControl

• List of all members, including inherited members

Public Types

enum	ViewfinderParameter { Resolution, PixelAspectRatio, MinimumFrameRate, MaximumFrameRate, PixelFormat, UserParameter }

Public Functions

virtual	~QCameraViewfinderSettingsControl()
virtual bool	isViewfinderParameterSupported(QCameraViewfinderSettingsControl::ViewfinderParameter parameter) const = 0
virtual void	setViewfinderParameter(QCameraViewfinderSettingsControl::ViewfinderParameter parameter, const QVariant &value) = 0
virtual QVariant	viewfinderParameter(QCameraViewfinderSettingsControl::ViewfinderParameter parameter) const = 0

Protected Functions

QCameraViewfinderSettingsControl(QObject *parent = nullptr)

Macros

QCameraViewfinderSettingsControl_iid

Detailed Description

The interface name of QCameraViewfinderSettingsControl is org.qt-project.qt.cameraviewfindersettingscontrol/5.0 as defined in QCameraViewfinderSettingsControl_iid.

Warning: New backends should implement QCameraViewfinderSettingsControl2 instead. Application developers should request this control only if QCameraViewfinderSettingsControl2 is not available.

See also QMediaService::requestControl(), QCameraViewfinderSettingsControl2, and QCamera.

Member Type Documentation

enum QCameraViewfinderSettingsControl::ViewfinderParameter

Constant	Value	Description
QCameraViewfinderSettingsControl::Resolution	0	Viewfinder resolution, QSize.
QCameraViewfinderSettingsControl::PixelAspectRatio	1	Pixel aspect ratio, QSize as in QVideoSurfaceFormat::pixelAspectRatio
QCameraViewfinderSettingsControl::MinimumFrameRate	2	Minimum viewfinder frame rate, qreal
QCameraViewfinderSettingsControl::MaximumFrameRate	3	Maximum viewfinder frame rate, qreal
QCameraViewfinderSettingsControl::PixelFormat	4	Viewfinder pixel format, QVideoFrame::PixelFormat
QCameraViewfinderSettingsControl::UserParameter	1000	The base value for platform specific extended parameters. For such parameters the sequential values starting from UserParameter should be used.

Member Function Documentation

[protected] QCameraViewfinderSettingsControl::QCameraViewfinderSettingsControl(QObject *parent = nullptr)

Constructs a camera viewfinder control object with parent.

[virtual] QCameraViewfinderSettingsControl::~QCameraViewfinderSettingsControl()

Destroys the camera viewfinder control object.

[pure virtual] bool QCameraViewfinderSettingsControl::isViewfinderParameterSupported(QCameraViewfinderSettingsControl::ViewfinderParameter parameter) const

Returns true if configuration of viewfinder parameter is supported by camera backend.

[pure virtual] void QCameraViewfinderSettingsControl::setViewfinderParameter(QCameraViewfinderSettingsControl::ViewfinderParameter parameter, const QVariant &value)

Set the prefferred value of viewfinder parameter.

Calling this while the camera is active may result in the camera being stopped and reloaded. If video recording is in progress, this call may be ignored.

If an unsupported parameter is specified the camera may fail to load, or the setting may be ignored.

Viewfinder parameters may also depend on other camera settings, especially in video capture mode. If camera configuration conflicts with viewfinder settings, the camara configuration is usually preferred.

See also viewfinderParameter().

[pure virtual] QVariant QCameraViewfinderSettingsControl::viewfinderParameter(QCameraViewfinderSettingsControl::ViewfinderParameter parameter) const

Returns the value of viewfinder parameter.

See also setViewfinderParameter().