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· Page d'accueil · Toutes les classes · Classes principales · Annotées · Classes groupées · Modules · Fonctions ·

Multimedia Overview

Overview

Features

Qt Multimedia offers APIs for doing many multimedia related tasks:

Accessing raw audio devices for input and output
Play low latency sound effects
Play media files in playlists (like compressed audio, or video files)
Record audio and compress it
Tune and listen to radio stations, and receive radio program information
Use a camera, including viewfinder, image capture, and movie recording
Play 3D positional audio with QtAudioEngine
Decode audio media files into memory for processing
Accessing video frames or audio buffers as they are played or recorded

Multimedia Components

All of these tasks can be broadly broken down into four main areas. More information (including background information and class references) are available here:

Multimedia recipes

For some quick recipes for specific tasks, look at the overviews above and consult this table:

Use case	Examples	QML Classes	C++ Classes
Playing a sound effect	TBD	SoundEffect	QSoundEffect
Playing low latency audio	audiooutput, spectrum		QAudioOutput
Playing encoded audio (MP3, AAC etc)	player	Audio, MediaPlayer	QMediaPlayer
Accessing raw audio input data	spectrum, audioinput		QAudioInput
Recording encoded audio data	audiorecorder		QAudioRecorder
Discovering raw audio devices	audiodevices		QAudioDeviceInfo
Video Playback	player, qmlvideo, qmlvideofx	MediaPlayer, VideoOutput, Video	QMediaPlayer, QVideoWidget, QGraphicsVideoItem
Video Processing	qmlvideofx	MediaPlayer, VideoOutput	QMediaPlayer, QAbstractVideoSurface, QVideoFrame
Listening to the radio	declarative-radio	Radio, RadioData	QRadioTuner, QRadioData
Accessing camera viewfinder	camera, declarative-camera	Camera, VideoOutput	QCamera, QVideoWidget, QGraphicsVideoItem
Viewfinder processing		Camera, VideoOutput	QCamera, QAbstractVideoSurface, QVideoFrame
Capturing photos	camera, declarative-camera	Camera	QCamera, QCameraImageCapture
Capturing movies	camera, declarative-camera	Camera	QCamera, QMediaRecorder
3D sound sources	Audio Engine	AudioEngine, Sound

Limitations

In many cases the Qt Multimedia APIs build upon the multimedia framework of the underlying system. This can mean that support for various codec or containers can vary between machines, depending on what the end user has installed.

Advanced Usage

For developers wishing to access some platform specific settings, or to port the Qt Multimedia APIs to a new platform or technology, see Multimedia Backend Development.

Changes from previous versions

If you've previously used Qt Multimedia in Qt 4.x, or used Qt Multimedia Kit in Qt Mobility, please see Changes in Qt Multimedia for more information on what has changed, and what you might need to change when porting code.

Reference Documentation

QML Types

The following types are accessed by using:

 import QtMultimedia 5.0

QtMultimedia5::Audio	The Audio type allows you to add audio playback to a scene.
QtMultimedia5::Camera	The Camera type allows you to access viewfinder frames, and take photos and movies.
QtMultimedia5::CameraCapture	The CameraCapture type provides an interface for capturing camera images
QtMultimedia5::CameraExposure	The CameraExposure type provides interface for exposure related camera settings.
QtMultimedia5::CameraFlash	The CameraFlash type provides interface for flash related camera settings.
QtMultimedia5::CameraFocus	The CameraFocus type provides interface for focus related camera settings.
QtMultimedia5::CameraImageProcessing	The CameraImageProcessing type provides an interface for camera capture related settings
QtMultimedia5::CameraRecorder	The CameraRecorder type controls video recording with the Camera.
QtMultimedia5::MediaPlayer	The MediaPlayer type allows you to add media playback to a scene.
QtMultimedia5::Radio	The Radio type allows you to access radio functionality from a QML application.
QtMultimedia5::RadioData	The RadioData type allows you to access RDS data from a QML application.
QtMultimedia5::SoundEffect	The SoundEffect type provides a way to play sound effects in QML.
QtMultimedia5::Torch	The Torch type provides simple control over torch functionality
Video	A convenience type for showing a specified video
QtMultimedia5::VideoOutput	The VideoOutput type allows you to render video or camera viewfinder.

The following types are accessed by using QtAudioEngine:

 import QtAudioEngine 1.0

AttenuationModelInverse	Defines a non-linear attenuation curve for a Sound.
QtAudioEngine1::AttenuationModelLinear	Defines a linear attenuation curve for a Sound.
QtAudioEngine1::AudioCategory	Control all active sound instances by group.
QtAudioEngine1::AudioEngine	The AudioEngine type allows you to organize all your 3d audio content in one place.
QtAudioEngine1::AudioListener	The AudioListener type allows you to control global listener parameters.
QtAudioEngine1::AudioSample	The AudioSample type allows you to load audio samples, mostly wav file.
QtAudioEngine1::PlayVariation	The PlayVariation type allows you to define a playback variation for sounds. So each time the playback of the same sound can be a slightly different even with the same AudioSample.
QtAudioEngine1::Sound	The Sound type allows you to define a variety of samples and parameters to be used for SoundInstance.
QtAudioEngine1::SoundInstance	The SoundInstance type allows you to play 3d audio content.

Multimedia Classes

QAbstractVideoBuffer	Abstraction for video data
QAbstractVideoSurface	Base class for video presentation surfaces
QAudio	Contains enums used by the audio classes
QAudioBuffer	Represents a collection of audio samples with a specific format and sample rate
QAudioDecoder	Allows decoding audio
QAudioDecoderControl	Access to the audio decoding functionality of a QMediaService
QAudioDeviceInfo	Interface to query audio devices and their functionality
QAudioEncoderControl	Access to the settings of a media service that performs audio encoding
QAudioEncoderSettings	Set of audio encoder settings
QAudioEndpointSelector	Audio endpoint selector media control
QAudioFormat	Stores audio stream parameter information
QAudioInput	Interface for receiving audio data from an audio input device
QAudioOutput	Interface for sending audio data to an audio output device
QAudioProbe	Allows you to monitor audio being played or recorded
QAudioRecorder	Used for the recording of audio
QCamera	Interface for system camera devices
QCameraCaptureBufferFormatControl	Control for setting the capture buffer format
QCameraCaptureDestinationControl	Control for setting capture destination
QCameraControl	Abstract base class for classes that control still cameras or video cameras
QCameraExposure	Interface for exposure related camera settings
QCameraExposureControl	Allows controlling camera exposure parameters
QCameraFeedbackControl	Allows controlling feedback (sounds etc) during camera operation
QCameraFlashControl	Allows controlling a camera's flash
QCameraFocusControl	Supplies control for focusing related camera parameters
QCameraFocusZone	Information on zones used for autofocusing a camera
QCameraImageCapture	Used for the recording of media content
QCameraImageCaptureControl	Control interface for image capture services
QCameraImageProcessing	Interface for image processing related camera settings
QCameraImageProcessingControl	Abstract class for controlling image processing parameters, like white balance, contrast, saturation, sharpening and denoising
QCameraLocksControl	Abstract base class for classes that control still cameras or video cameras
QCameraViewfinderSettingsControl	Abstract class for controlling camera viewfinder parameters
QCameraZoomControl	Supplies control for optical and digital camera zoom
QGraphicsEffect	The base class for all graphics effects
QGraphicsVideoItem	Graphics item which display video produced by a QMediaObject
QImageEncoderControl	Access to the settings of a media service that performs image encoding
QMediaAudioProbeControl	Allows control over probing audio data in media objects
QMediaAvailabilityControl	Supplies a control for reporting availability of a service
QMediaBindableInterface	The base class for objects extending media objects functionality
QMediaContainerControl	Access to the output container format of a QMediaService
QMediaContent	Access to the resources relating to a media content
QMediaControl	Base interface for media service controls
QMediaGaplessPlaybackControl	Access to the gapless playback related control of a QMediaService
QMediaNetworkAccessControl	Allows the setting of the Network Access Point for media related activities
QMediaObject	Common base for multimedia objects
QMediaPlayer	Allows the playing of a media source
QMediaPlayerControl	Access to the media playing functionality of a QMediaService
QMediaPlaylist	List of media content to play
QMediaRecorder	Used for the recording of media content
QMediaRecorderControl	Access to the recording functionality of a QMediaService
QMediaResource	Description of a media resource
QMediaService	Common base class for media service implementations
QMediaStreamsControl	Media stream selection control
QMediaTimeInterval	Represents a time interval with integer precision
QMediaTimeRange	Represents a set of zero or more disjoint time intervals
QMediaVideoProbeControl	Allows control over probing video frames in media objects
QMetaDataReaderControl	Read access to the meta-data of a QMediaService's media
QMetaDataWriterControl	Write access to the meta-data of a QMediaService's media
QRadioData	Interfaces to the RDS functionality of the system radio
QRadioDataControl	Access to the RDS functionality of the radio in the QMediaService
QRadioTuner	Interface to the systems analog radio device
QRadioTunerControl	Access to the radio tuning functionality of a QMediaService
QSound	Method to play .wav sound files
QSoundEffect	Way to play low latency sound effects
QStaticText	Enables optimized drawing of text when the text and its layout is updated rarely
QVideoDeviceControl	Video device selector media control
QVideoEncoderControl	Access to the settings of a media service that performs video encoding
QVideoFrame	Represents a frame of video data
QVideoProbe	Allows you to monitor video frames being played or recorded
QVideoRendererControl
QVideoSurfaceFormat	Specifies the stream format of a video presentation surface
QVideoWidget	Widget which presents video produced by a media object
QtMultimedia	Contains miscellaneous identifiers used throughout the Qt Multimedia library
QAudioBuffer::StereoSample	Simple wrapper for a stereo audio sample
Phonon::VideoWidget	Widget that is used to display video

The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation.

Documentation sources may be obtained from www.qt-project.org.

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