内容

特性
信号
方法
详细描述

MediaPlayer QML 类

将媒体回放添加到场景。更多...

import 语句：	import QtMultimedia
实例化：	QMediaPlayer

所有成员列表，包括继承成员

特性

activeAudioTrack : int
activeSubtitleTrack : int
activeVideoTrack : int
audioOutput : AudioOutput
audioTracks : list<mediaMetaData>
bufferProgress : real
duration : int
error : enumeration
errorString : string
hasAudio : bool
hasVideo : bool
loops : int
mediaStatus : enumeration
metaData : mediaMetaData
playbackRate : real
playbackState : enumeration
position : int
seekable : bool
source : url
subtitleTracks : list<mediaMetaData>
videoOutput : VideoOutput
videoTracks : list<mediaMetaData>

信号

errorOccurred ( error , errorString )
playbackStateChanged ()

方法

pause ()
play ()
stop ()

详细描述

Text {
    text: "Click Me!";
    font.pointSize: 24;
    width: 150; height: 50;
    MediaPlayer {
        id: playMusic
        source: "music.wav"
        audioOutput: AudioOutput {}
    }
    MouseArea {
        anchors.fill: parent
        onPressed:  { playMusic.play() }
    }
}

You can use MediaPlayer together with a MultiMedia::AudioOutput to play audio content, or you can use it in conjunction with a Multimedia::VideoOutput for rendering video.

Item {
    MediaPlayer {
        id: mediaplayer
        source: "groovy_video.mp4"
        audioOutput: AudioOutput {}
        videoOutput: videoOutput
    }
    VideoOutput {
        id: videoOutput
        anchors.fill: parent
    }
    MouseArea {
        anchors.fill: parent
        onPressed: mediaplayer.play();
    }
}

另请参阅 AudioOutput and VideoOutput .

特性文档编制

activeAudioTrack : int

This property holds the track number of the currently active audio track. Set to -1 to disable audio track.

默认特性值为 0 : the first audio track.

activeSubtitleTrack : int

This property holds the track number of the currently active subtitle track. Set to -1 to disable subtitle track.

默认特性值为 -1 : no subtitles active.

activeVideoTrack : int

This property holds the track number of the currently active video audio track. Set to -1 to disable video track.

默认特性值为 0 : the first video track.

audioOutput : AudioOutput

This property holds the target audio output. Accepts one AudioOutput 元素。

另请参阅 QMediaPlayer::setAudioOutput() .

audioTracks : list < mediaMetaData >

This property holds a list of metadata. Each index refers to an audio track.

The metadata holds properties describing the individual tracks. For audio tracks the Language is usually the most important property.

另请参阅 mediaMetaData .

bufferProgress : real

This property holds how much of the data buffer is currently filled, from 0.0 (空) 到 1.0 (完整)。

Playback can start or resume only when the buffer is entirely filled. When the buffer is filled, MediaPlayer.Buffered is true. When buffer progress is between 0.0 and 0.1 , MediaPlayer.Buffering 被设为 true .

值低于 1.0 implies that the property MediaPlayer.StalledMedia is true .

另请参阅 mediaStatus .

duration : int

This property holds the duration of the media in milliseconds.

If the media doesn't have a fixed duration (a live stream for example) this will be set to 0 .

error : enumeration

This property holds the error state of the audio. It can be one of the following.

值	描述
NoError	There is no current error.
ResourceError	The audio cannot be played due to a problem allocating resources.
FormatError	The audio format is not supported.
NetworkError	The audio cannot be played due to network issues.
AccessDeniedError	The audio cannot be played due to insufficient permissions.

errorString : string

This property holds a string describing the current error condition in more detail.

hasAudio : bool

This property holds whether the media contains audio.

hasVideo : bool

This property holds whether the media contains video.

loops : int

Determines how often the media is played before the player stops. Set to MediaPlayer::Infinite to loop the current media file forever.

默认值为 1 。把此特性设为 0 不起作用。

mediaStatus : enumeration

This property holds the status of media loading. It can be one of the following:

Property value	描述
NoMedia	No media has been set.
LoadingMedia	The media is currently being loaded.
LoadedMedia	The media has been loaded.
BufferingMedia	The media is buffering data.
StalledMedia	Playback has been interrupted while the media is buffering data.
BufferedMedia	The media has buffered data.
EndOfMedia	The media has played to the end.
InvalidMedia	The media cannot be played.

metaData : mediaMetaData

返回媒体播放器当前所用的媒体元数据。

元数据可以包含如视频标题 (或其创建日期) 的信息。

注意： Windows 实现仅为位于本地文件系统中的媒体提供元数据。

playbackRate : real

This property holds the rate at which audio is played at as a multiple of the normal rate.

默认为 1.0 .

playbackState : enumeration

This property holds the state of media playback. It can be one of the following:

Property value	描述
PlayingState	The media is currently playing.
PausedState	Playback of the media has been suspended.
StoppedState	Playback of the media is yet to begin.

position : int

The value is the current playback position, expressed in milliseconds since the beginning of the media. Periodically changes in the position will be indicated with the positionChanged() signal.

若 seekable property is true, this property can be set to milliseconds.

seekable : bool

This property holds whether the position of the media can be changed.

source : url

This property holds the source URL of the media.

Item {
    MediaPlayer {
        id: mediaplayer
        source: "file:///test.mp4"
        videoOutput: videoOutput
        audioOutput: AudioOutput {
        }
    }
    VideoOutput {
        id: videoOutput
        anchors.fill: parent
    }
    MouseArea {
        id: playArea
        anchors.fill: parent
        onPressed: mediaplayer.play();
    }
}

另请参阅 QMediaPlayer::setSource() .

subtitleTracks : list < mediaMetaData >

This property holds a list of metadata. Each index refers to a subtitle track.

The metadata holds properties describing the individual tracks. For subtitle tracks the Language is usually the most important property.

另请参阅 mediaMetaData .

videoOutput : VideoOutput

This property holds the target video output. Accepts one VideoOutput 元素。

另请参阅 QMediaPlayer::setVideoOutput() .

videoTracks : list < mediaMetaData >

This property holds a list of metadata. Each index refers to a video track.

The metadata holds properties describing the individual tracks.

另请参阅 mediaMetaData .

信号文档编制

errorOccurred ( error , errorString )

此信号被发射当 error has occurred. The errorString parameter may contain more detailed information about the error.

注意： 相应处理程序是 onErrorOccurred .

另请参阅 QMediaPlayer::Error .

playbackStateChanged ()

此信号被发射当 playbackState property is altered.

注意： 相应处理程序是 onPlaybackStateChanged .

方法文档编制

pause ()

Pauses playback of the media.

设置 playbackState property to PausedState.

play ()

Starts or resumes playback of the media.

设置 playbackState property to PlayingState.

stop ()

Stops playback of the media.

设置 playbackState property to StoppedState.