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QMediaCaptureSession Class

The QMediaCaptureSession class allows capturing of audio and video content. More...

Header: #include <QMediaCaptureSession>
CMake: find_package(Qt6 REQUIRED COMPONENTS Multimedia)
target_link_libraries(mytarget PRIVATE Qt6::Multimedia)
qmake: QT += multimedia
Instantiated By: CaptureSession
Inherits: QObject

Properties

Public Functions

QMediaCaptureSession(QObject *parent = nullptr)
virtual ~QMediaCaptureSession()
QAudioInput *audioInput() const
QAudioOutput *audioOutput() const
QCamera *camera() const
QImageCapture *imageCapture()
QMediaRecorder *recorder()
QScreenCapture *screenCapture()
void setAudioInput(QAudioInput *input)
void setAudioOutput(QAudioOutput *output)
void setCamera(QCamera *camera)
void setImageCapture(QImageCapture *imageCapture)
void setRecorder(QMediaRecorder *recorder)
void setScreenCapture(QScreenCapture *screenCapture)
void setVideoOutput(QObject *output)
void setVideoSink(QVideoSink *sink)
QObject *videoOutput() const
QVideoSink *videoSink() const

Signals

void audioInputChanged()
void audioOutputChanged()
void cameraChanged()
void imageCaptureChanged()
void recorderChanged()
void screenCaptureChanged()
void videoOutputChanged()

Detailed Description

The QMediaCaptureSession is the central class that manages capturing of media on the local device.

You can connect a video input to QMediaCaptureSession using setCamera() or setScreenCapture(). A preview of the captured media can be seen by setting a QVideoWidget or QGraphicsVideoItem using setVideoOutput().

You can connect a microphone to QMediaCaptureSession using setAudioInput(). The captured sound can be heard by routing the audio to an output device using setAudioOutput().

You can capture still images from a camera by setting a QImageCapture object on the capture session, and record audio/video using a QMediaRecorder.

See also QCamera, QAudioDevice, QMediaRecorder, QImageCapture, QMediaRecorder, and QScreenCapture.

Property Documentation

audioInput : QAudioInput*

Returns the device that is being used to capture audio.

Access functions:

QAudioInput *audioInput() const
void setAudioInput(QAudioInput *input)

Notifier signal:

void audioInputChanged()

audioOutput : QAudioOutput*

Returns the audio output for the session.

Access functions:

QAudioOutput *audioOutput() const
void setAudioOutput(QAudioOutput *output)

Notifier signal:

void audioOutputChanged()

camera : QCamera*

This property holds the camera used to capture video.

Record video or take images by adding a camera to the capture session using this property,

Access functions:

QCamera *camera() const
void setCamera(QCamera *camera)

Notifier signal:

void cameraChanged()

imageCapture : QImageCapture*

This property holds the object used to capture still images.

Add a QImageCapture object to the capture session to enable capturing of still images from the camera.

Access functions:

QImageCapture *imageCapture()
void setImageCapture(QImageCapture *imageCapture)

Notifier signal:

void imageCaptureChanged()

recorder : QMediaRecorder*

This property holds the recorder object used to capture audio/video.

Add a QMediaRecorder object to the capture session to enable recording of audio and/or video from the capture session.

Access functions:

QMediaRecorder *recorder()
void setRecorder(QMediaRecorder *recorder)

Notifier signal:

void recorderChanged()

[since 6.5] screenCapture : QScreenCapture*

This property holds the object used to capture a screen.

Record a screen by adding a screen capture object to the capture session using this property.

This property was introduced in Qt 6.5.

Access functions:

QScreenCapture *screenCapture()
void setScreenCapture(QScreenCapture *screenCapture)

Notifier signal:

void screenCaptureChanged()

videoOutput : QObject*

Returns the video output for the session.

Access functions:

QObject *videoOutput() const
void setVideoOutput(QObject *output)

Notifier signal:

void videoOutputChanged()

Member Function Documentation

[explicit] QMediaCaptureSession::QMediaCaptureSession(QObject *parent = nullptr)

Creates a session for media capture from the parent object.

[virtual] QMediaCaptureSession::~QMediaCaptureSession()

Destroys the session.

void QMediaCaptureSession::setAudioInput(QAudioInput *input)

Sets the audio input device to input. If setting it to an empty QAudioDevice the capture session will use the default input as defined by the operating system.

Note: Setter function for property audioInput.

See also audioInput().

void QMediaCaptureSession::setAudioOutput(QAudioOutput *output)

Sets the audio output device to output.

Setting an audio output device enables audio routing from an audio input device.

Note: Setter function for property audioOutput.

See also audioOutput().

void QMediaCaptureSession::setVideoOutput(QObject *output)

Sets a QObject, (output), to a video preview for the capture session.

A QObject based preview is expected to have an invokable videoSink() method that returns a QVideoSink.

The previously set preview is detached.

Note: Setter function for property videoOutput.

See also videoOutput().

void QMediaCaptureSession::setVideoSink(QVideoSink *sink)

Sets a QVideoSink, (sink), to a video preview for the capture session.

A QObject based preview is expected to have an invokable videoSink() method that returns a QVideoSink.

The previously set preview is detached.

See also videoSink().

QVideoSink *QMediaCaptureSession::videoSink() const

Returns the QVideoSink for the session.

See also setVideoSink().

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