A set of APIs for working with audio, video, radio and camera devices.
Qt 提供多媒体支持通过 Qt Multimedia module. The Qt Multimedia module provides a rich feature set that enables you to easily take advantage of a platform’s multimedia capabilities such as media playback and the use of camera and radio devices.
这里是 Qt Multimedia API 能做什么的一些范例：
访问输入/输出原生音频设备
播放低延迟音效
播放 playlist 媒体文件 (譬如：压缩音频/视频文件)
录制音频并压缩
调整和收听无线电台
使用摄像头 (包括取景器) 捕获图像 录制影片
播放 3D 位置音频，采用 Qt Audio Engine
把音频媒体文件解码到内存中进行处理
在播放 (或录制) 视频帧/音频缓冲时，访问它们
对于某些快速配方，请查看以上概述并查阅下表：
用例
范例
QML 类型
C++ 类
播放音效
播放低延迟音频
播放编码音频 (MP3 AAC 等)
Audio , MediaPlayer
访问原生音频输入数据
录制编码音频数据
探索原生音频设备
视频回放
player , qmlvideo , qmlvideofx
MediaPlayer , VideoOutput , Video
视频处理
MediaPlayer , VideoOutput
收听无线电
Radio , RadioData
访问摄像头取景器
Camera , VideoOutput
取景器处理
Camera , VideoOutput
捕获照片
捕获影片
3D 音源
AudioEngine , Sound
Qt Multimedia API 构建于底层平台多媒体框架之上。这可能意味着对各种编解码器或容器的支持因机器而异，取决于最终用户安装了什么。
若先前使用 Qt 4 的 Qt Multimedia，或使用 Qt Mobility 的 Qt Multimedia Kit，请参阅 Qt Multimedia 的变化 了解有关改变的更多信息，及可能需要更改什么当移植代码时。
访问 QML 类型，通过使用：
import QtMultimedia 5.8
qml-qtmultimedia-video.html
A convenience type for showing a specified video.
qml-qtmultimedia-audio.html
Add audio playback to a scene.
qml-qtmultimedia-mediaplayer.html
把媒体回放添加到场景。
qml-qtmultimedia-camera.html
访问取景器帧，并拍摄照片和影片。
qml-qtmultimedia-cameracapture.html
An interface for capturing camera images.
qml-qtmultimedia-cameraexposure.html
An interface for exposure related camera settings.
qml-qtmultimedia-cameraflash.html
An interface for flash related camera settings.
qml-qtmultimedia-camerafocus.html
An interface for focus related camera settings.
qml-qtmultimedia-cameraimageprocessing.html
An interface for camera capture related settings.
qml-qtmultimedia-camerarecorder.html
Controls video recording with the Camera.
qml-qtmultimedia-qtmultimedia.html
Provides a global object with useful functions from Qt Multimedia.
qml-qtmultimedia-playlistitem.html
Defines an item in a Playlist.
qml-qtmultimedia-playlist.html
用于指定要播放媒体的列表。
qml-qtmultimedia-radio.html
Access radio functionality from a QML application.
qml-qtmultimedia-radiodata.html
从 QML 应用程序访问 RDS 数据。
qml-qtmultimedia-torch.html
Simple control over torch functionality.
qml-qtmultimedia-soundeffect.html
The SoundEffect type provides a way to play sound effects in QML.
qml-qtmultimedia-videooutput.html
渲染视频 (或摄像头取景器)。
访问下列类型，通过使用 Qt Audio Engine :
qml-qtaudioengine-attenuationmodellinear.html
Defines a linear attenuation curve for a Sound.
qml-qtaudioengine-attenuationmodelinverse.html
Defines a non-linear attenuation curve for a Sound.
qml-qtaudioengine-audiocategory.html
Control all active sound instances by group.
qml-qtaudioengine-audioengine.html
将所有 3D 音频内容组织在一处。
qml-qtaudioengine-audiolistener.html
Control global listener parameters.
qml-qtaudioengine-audiosample.html
Load audio samples, mostly .wav.
qml-qtaudioengine-playvariation.html
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.
qml-qtaudioengine-sound.html
Define a variety of samples and parameters to be used for SoundInstance.
qml-qtaudioengine-soundinstance.html
Play 3d audio content.
qaudio.html
QAudio 名称空间包含用于音频类的枚举。
QAudioBuffer 类表示具有特定格式和采样率的，音频样本的集合。
QAudioBuffer.StereoFrameStereoFrame 类提供立体声音频帧简单包裹器。
QAudioDecoder 类允许解码音频。
QAudioDeviceInfo 类提供查询音频设备及其功能的接口。
The QAudioFormat class stores audio stream parameter information.
QAudioInput 类为从音频输入设备接收音频数据提供接口。
The QAudioOutput class provides an interface for sending audio data to an audio output device.
The QAudioProbe class allows you to monitor audio being played or recorded.
The QAbstractAudioDeviceInfo class is a base class for audio backends.
The QAbstractAudioOutput class is a base class for audio backends.
The QAbstractAudioInput class provides access for QAudioInput to access the audio device provided by the plugin.
QAudioSystemPluginThe QAudioSystemPlugin class provides an abstract base for audio plugins.
The QSound class provides a method to play .wav sound files.
QSoundEffect 类提供播放低延迟声音效果的办法。
QCamera 类提供系统摄像头设备的接口。
QCamera.FrameRateRangeFrameRateRange 表示最小和最大速率的帧速率范围。
PySide2.QtMultimedia.QCameraExposureQCameraExposure 类提供用于曝光相关摄像头设置的接口。
The QCameraFocusZone class provides information on zones used for autofocusing a camera.
PySide2.QtMultimedia.QCameraFocusThe QCameraFocus class provides an interface for focus and zoom related camera settings.
QCameraImageCapture 类用于录制媒体内容。
PySide2.QtMultimedia.QCameraImageProcessingThe QCameraImageProcessing class provides an interface for image processing related camera settings.
The QCameraInfo class provides general information about camera devices.
QCameraViewfinderSettings 类提供一套取景器设置。
QMediaContent 类提供对媒体内容相关资源的访问。
QMediaPlayer 类允许播放媒体源。
The QMediaPlaylist class provides a list of media content to play.
The QMediaPlaylistReader class provides an interface for reading a playlist file.
The QMediaPlaylistNavigator class provides navigation for a media playlist.
The QMediaPlaylistProvider class provides an abstract list of media.
The QMediaResource class provides a description of a media resource.
QMediaBindableInterface 类是扩展媒体对象功能的对象基类。
The QMediaControl class provides a base interface for media service controls.
qmediametadata.html
提供元数据属性标识符。
QMediaObject 类为多媒体对象提供公共基。
The QMediaService class provides a common base class for media service implementations.
The QMediaServiceProviderHint class describes what is required of a QMediaService.
The QMediaServiceProvider class provides an abstract allocator for media services.
The QMediaTimeInterval class represents a time interval with integer precision.
The QMediaTimeRange class represents a set of zero or more disjoint time intervals.
qmultimedia.html
QMultimedia 名称空间包含用于整个 Qt Multimedia 库的杂项标识符。
The QRadioData class provides interfaces to the RDS functionality of the system radio.
The QRadioTuner class provides an interface to the systems analog radio device.
The QAudioRecorder class is used for the recording of audio.
The QAudioEncoderSettings class provides a set of audio encoder settings.
QVideoEncoderSettings 类提供一组视频编码器设置。
QImageEncoderSettings 类提供一组图像编码器设置。
QMediaRecorder 类用于录制媒体内容。
QAbstractVideoBuffer 类是视频数据的抽象。
QAbstractPlanarVideoBufferThe QAbstractPlanarVideoBuffer class is an abstraction for planar video data.
The QAbstractVideoFilter class represents a filter that is applied to the video frames received by a VideoOutput type.
The QVideoFilterRunnable class represents the implementation of a filter that owns all graphics and computational resources, and performs the actual filtering or calculations.
QAbstractVideoSurface 类是视频呈现表面基类。
QVideoFrame 类表示视频数据的帧。
QVideoProbe 类允许监视视频帧播放或录制。
QVideoSurfaceFormat 类指定视频呈现表面的流格式。
The QGraphicsVideoItem class provides a graphics item which display video produced by a QMediaObject.
QVideoWidget 类提供呈现媒体对象产生视频的小部件。
