QMediaPlayerControl 类

QMediaPlayerControl 类提供访问媒体播放功能,针对 QMediaService . 更多...

头: #include <QMediaPlayerControl>
qmake: QT += multimedia
继承: QMediaControl

该类已过时。 提供它是为使旧源代码能继续工作。强烈建议不要在新代码中使用它。

公共函数

virtual ~QMediaPlayerControl ()
virtual QMediaTimeRange availablePlaybackRanges () const = 0
virtual int bufferStatus () const = 0
virtual qint64 duration () const = 0
virtual bool isAudioAvailable () const = 0
virtual bool isMuted () const = 0
virtual bool isSeekable () const = 0
virtual bool isVideoAvailable () const = 0
virtual QMediaContent media () const = 0
virtual QMediaPlayer::MediaStatus mediaStatus () const = 0
virtual const QIODevice * mediaStream () const = 0
virtual void pause () = 0
virtual void play () = 0
virtual qreal playbackRate () const = 0
virtual qint64 position () const = 0
virtual void setMedia (const QMediaContent & media , QIODevice * stream ) = 0
virtual void setMuted (bool mute ) = 0
virtual void setPlaybackRate (qreal rate ) = 0
virtual void setPosition (qint64 position ) = 0
virtual void setVolume (int volume ) = 0
virtual QMediaPlayer::State state () const = 0
virtual void stop () = 0
virtual int volume () const = 0

信号

void audioAvailableChanged (bool audioAvailable )
void availablePlaybackRangesChanged (const QMediaTimeRange & ranges )
void bufferStatusChanged (int percentFilled )
void durationChanged (qint64 duration )
void error (int error , const QString & errorString )
void mediaChanged (const QMediaContent & content )
void mediaStatusChanged (QMediaPlayer::MediaStatus status )
void mutedChanged (bool mute )
void playbackRateChanged (qreal rate )
void positionChanged (qint64 position )
void seekableChanged (bool seekable )
void stateChanged (QMediaPlayer::State newState )
void videoAvailableChanged (bool videoAvailable )
void volumeChanged (int volume )

保护函数

QMediaPlayerControl (QObject * parent = nullptr)

QMediaPlayerControl_iid

详细描述

QMediaService can play media is will implement QMediaPlayerControl. This control provides a means to set the media to play, start , pause and stop playback, seek , and control the volume . It also provides feedback on the duration of the media, the current position ,和 buffering progress.

The functionality provided by this control is exposed to application code through the QMediaPlayer 类。

The interface name of QMediaPlayerControl is org.qt-project.qt.mediaplayercontrol/5.0 作为定义在 QMediaPlayerControl_iid .

另请参阅 QMediaService::requestControl () 和 QMediaPlayer .

成员函数文档编制

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

Constructs a new media player control with the given parent .

[signal] void QMediaPlayerControl:: audioAvailableChanged ( bool audioAvailable )

Signals that there has been a change in the availability of audio output audioAvailable .

另请参阅 isAudioAvailable ().

[signal] void QMediaPlayerControl:: availablePlaybackRangesChanged (const QMediaTimeRange & ranges )

Signals that the available media playback ranges have changed.

另请参阅 QMediaPlayerControl::availablePlaybackRanges ().

[signal] void QMediaPlayerControl:: bufferStatusChanged ( int percentFilled )

Signal the amount of the local buffer filled as a percentage by percentFilled .

另请参阅 bufferStatus ().

[signal] void QMediaPlayerControl:: durationChanged ( qint64 duration )

信号 duration 若当前媒体已改变。

另请参阅 duration ().

[signal] void QMediaPlayerControl:: error ( int error , const QString & errorString )

Signals that an error has occurred. The errorString provides a more detailed explanation.

[signal] void QMediaPlayerControl:: mediaChanged (const QMediaContent & content )

Signals that the current media content 已改变。

[signal] void QMediaPlayerControl:: mediaStatusChanged ( QMediaPlayer::MediaStatus status )

信号 status 若当前媒体已改变。

另请参阅 mediaStatus ().

[signal] void QMediaPlayerControl:: mutedChanged ( bool mute )

Signals a change in the mute status of a player control.

另请参阅 isMuted ().

[signal] void QMediaPlayerControl:: playbackRateChanged ( qreal rate )

Signal emitted when playback rate changes to rate .

[signal] void QMediaPlayerControl:: positionChanged ( qint64 position )

Signals the playback position 已改变。

This is only emitted in when there has been a discontinous change in the playback postion, such as a seek or the position being reset.

另请参阅 position ().

[signal] void QMediaPlayerControl:: seekableChanged ( bool seekable )

信号 seekable state of a player control has changed.

另请参阅 isSeekable ().

[signal] void QMediaPlayerControl:: stateChanged ( QMediaPlayer::State newState )

Signals that the state of a player control has changed to newState .

另请参阅 state ().

[signal] void QMediaPlayerControl:: videoAvailableChanged ( bool videoAvailable )

Signal that the availability of visual content has changed to videoAvailable .

另请参阅 isVideoAvailable ().

[signal] void QMediaPlayerControl:: volumeChanged ( int volume )

Signals the audio volume of a player control has changed.

另请参阅 volume ().

[虚拟] QMediaPlayerControl:: ~QMediaPlayerControl ()

Destroys a media player control.

[pure virtual] QMediaTimeRange QMediaPlayerControl:: availablePlaybackRanges () const

Returns a range of times in milliseconds that can be played back.

Usually for local files this is a continuous interval equal to [0.. duration ()] or an empty time range if seeking is not supported, but for network sources it refers to the buffered parts of the media.

[pure virtual] int QMediaPlayerControl:: bufferStatus () const

Returns the buffering progress of the current media. Progress is measured in the percentage of the buffer filled.

[pure virtual] qint64 QMediaPlayerControl:: duration () const

Returns the duration of the current media in milliseconds.

[pure virtual] bool QMediaPlayerControl:: isAudioAvailable () const

Identifies if there is audio output available for the current media.

Returns true if audio output is available and false otherwise.

[pure virtual] bool QMediaPlayerControl:: isMuted () const

Returns the mute state of a player control.

[pure virtual] bool QMediaPlayerControl:: isSeekable () const

Identifies if the current media is seekable.

Returns true if it possible to seek within the current media, and false otherwise.

[pure virtual] bool QMediaPlayerControl:: isVideoAvailable () const

Identifies if there is video output available for the current media.

Returns true if video output is available and false otherwise.

[pure virtual] QMediaContent QMediaPlayerControl:: media () const

Returns the current media source.

另请参阅 setMedia ().

[pure virtual] QMediaPlayer::MediaStatus QMediaPlayerControl:: mediaStatus () const

Returns the status of the current media.

[pure virtual] const QIODevice *QMediaPlayerControl:: mediaStream () const

Returns the current media stream. This is only a valid if a stream was passed to setMedia ().

另请参阅 setMedia ().

[pure virtual] void QMediaPlayerControl:: pause ()

Pauses playback of the current media.

If successful the player control will immediately enter the paused 状态。

另请参阅 state (), play (),和 stop ().

[pure virtual] void QMediaPlayerControl:: play ()

Starts playback of the current media.

If successful the player control will immediately enter the playing 状态。

另请参阅 state ().

[pure virtual] qreal QMediaPlayerControl:: playbackRate () const

Returns the rate of playback.

另请参阅 setPlaybackRate ().

[pure virtual] qint64 QMediaPlayerControl:: position () const

Returns the current playback position in milliseconds.

另请参阅 setPosition ().

[pure virtual] void QMediaPlayerControl:: setMedia (const QMediaContent & media , QIODevice * stream )

设置当前 media source. If a stream is supplied; data will be read from that instead of attempting to resolve the media source. The media source may still be used to supply media information such as mime type.

将媒体设为 null QMediaContent will cause the control to discard all information relating to the current media source and to cease all I/O operations related to that media.

Qt resource files are never passed as is. If the service supports QMediaServiceProviderHint::StreamPlayback stream is supplied, pointing to an opened QFile . Otherwise, the resource is copied into a temporary file and media contains the url to that file.

另请参阅 media ().

[pure virtual] void QMediaPlayerControl:: setMuted ( bool mute )

设置 mute state of a player control.

另请参阅 isMuted ().

[pure virtual] void QMediaPlayerControl:: setPlaybackRate ( qreal rate )

设置 rate of playback.

另请参阅 playbackRate ().

[pure virtual] void QMediaPlayerControl:: setPosition ( qint64 position )

Sets the playback position of the current media. This will initiate a seek and it may take some time for playback to reach the position set.

另请参阅 position ().

[pure virtual] void QMediaPlayerControl:: setVolume ( int volume )

设置音频 volume of a player control.

The volume is scaled linearly, ranging from 0 (无声) 到 100 (full volume).

另请参阅 volume ().

[pure virtual] QMediaPlayer::State QMediaPlayerControl:: state () const

Returns the state of a player control.

[pure virtual] void QMediaPlayerControl:: stop ()

Stops playback of the current media.

If successful the player control will immediately enter the stopped 状态。

[pure virtual] int QMediaPlayerControl:: volume () const

Returns the audio volume of a player control.

另请参阅 setVolume ().

宏文档编制

QMediaPlayerControl_iid

org.qt-project.qt.mediaplayercontrol/5.0

定义接口名为 QMediaPlayerControl 类。