The QMediaPlayerControl class provides access to the media playing functionality of a QMediaService . 更多...
| 头： | #include <QMediaPlayerControl> |
| qmake: | QT += multimedia |
| 继承： | QMediaControl |
| 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 |
| 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 ) |
| const QMetaObject | staticMetaObject |
| QMediaPlayerControl (QObject * parent = nullptr) |
| QMediaPlayerControl_iid |
The QMediaPlayerControl class provides access to the media playing functionality of a QMediaService .
若 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。
接口名称对于
QMediaPlayerControl
is
org.qt-project.qt.mediaplayercontrol/5.0
作为定义在
QMediaPlayerControl_iid
.
另请参阅 QMediaService::requestControl () 和 QMediaPlayer .
[protected]
QMediaPlayerControl::
QMediaPlayerControl
(
QObject
*
parent
= nullptr)
Constructs a new media player control with the given parent .
[虚拟]
QMediaPlayerControl::
~QMediaPlayerControl
()
Destroys a media player control.
[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 ().
[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.
[signal]
void
QMediaPlayerControl::
availablePlaybackRangesChanged
(const
QMediaTimeRange
&
ranges
)
Signals that the available media playback ranges have changed.
另请参阅 QMediaPlayerControl::availablePlaybackRanges ().
[pure virtual]
int
QMediaPlayerControl::
bufferStatus
() const
Returns the buffering progress of the current media. Progress is measured in the percentage of the buffer filled.
[signal]
void
QMediaPlayerControl::
bufferStatusChanged
(
int
percentFilled
)
Signal the amount of the local buffer filled as a percentage by percentFilled .
另请参阅 bufferStatus ().
[pure virtual]
qint64
QMediaPlayerControl::
duration
() const
Returns the duration of the current media in milliseconds.
[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.
[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 ().
[signal]
void
QMediaPlayerControl::
mediaChanged
(const
QMediaContent
&
content
)
Signals that the current media content 已改变。
[pure virtual]
QMediaPlayer::MediaStatus
QMediaPlayerControl::
mediaStatus
() const
Returns the status of the current media.
[signal]
void
QMediaPlayerControl::
mediaStatusChanged
(
QMediaPlayer::MediaStatus
status
)
信号 status 若当前媒体已改变。
另请参阅 mediaStatus ().
[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 ().
[signal]
void
QMediaPlayerControl::
mutedChanged
(
bool
mute
)
Signals a change in the mute status of a player control.
另请参阅 isMuted ().
[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 ().
[signal]
void
QMediaPlayerControl::
playbackRateChanged
(
qreal
rate
)
Signal emitted when playback rate changes to rate .
[pure virtual]
qint64
QMediaPlayerControl::
position
() const
Returns the current playback position in milliseconds.
另请参阅 setPosition ().
[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 ().
[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.
[signal]
void
QMediaPlayerControl::
stateChanged
(
QMediaPlayer::State
newState
)
Signals that the state of a player control has changed to newState .
另请参阅 state ().
[pure virtual]
void
QMediaPlayerControl::
stop
()
Stops playback of the current media.
If successful the player control will immediately enter the stopped 状态。
[signal]
void
QMediaPlayerControl::
videoAvailableChanged
(
bool
videoAvailable
)
Signal that the availability of visual content has changed to videoAvailable .
另请参阅 isVideoAvailable ().
[pure virtual]
int
QMediaPlayerControl::
volume
() const
Returns the audio volume of a player control.
另请参阅 setVolume ().
[signal]
void
QMediaPlayerControl::
volumeChanged
(
int
volume
)
Signals the audio volume of a player control has changed.
另请参阅 volume ().
org.qt-project.qt.mediaplayercontrol/5.0
定义接口名为 QMediaPlayerControl 类。