QMediaPlayerControl Class

The QMediaPlayerControl class provides access to the media playing functionality of a QMediaService. More...

Header:	#include <QMediaPlayerControl>
qmake:	QT += multimedia
Inherits:	QMediaControl

• List of all members, including inherited members

Public Functions

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

Signals

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)

Protected Functions

QMediaPlayerControl(QObject *parent = nullptr)

Macros

QMediaPlayerControl_iid

Detailed Description

If a 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, and buffering progress.

The functionality provided by this control is exposed to application code through the QMediaPlayer class.

The interface name of QMediaPlayerControl is org.qt-project.qt.mediaplayercontrol/5.0 as defined in QMediaPlayerControl_iid.

See also QMediaService::requestControl() and QMediaPlayer.

Member Function Documentation

[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.

See also isAudioAvailable().

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

Signals that the available media playback ranges have changed.

See also QMediaPlayerControl::availablePlaybackRanges().

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

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

See also bufferStatus().

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

Signals that the duration of the current media has changed.

See also 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 has changed.

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

Signals that the status of the current media has changed.

See also mediaStatus().

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

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

See also 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 has changed.

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.

See also position().

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

Signals that the seekable state of a player control has changed.

See also isSeekable().

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

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

See also state().

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

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

See also isVideoAvailable().

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

Signals the audio volume of a player control has changed.

See also volume().

[virtual] 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.

See also 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().

See also setMedia().

[pure virtual] void QMediaPlayerControl::pause()

Pauses playback of the current media.

If successful the player control will immediately enter the paused state.

See also state(), play(), and stop().

[pure virtual] void QMediaPlayerControl::play()

Starts playback of the current media.

If successful the player control will immediately enter the playing state.

See also state().

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

Returns the rate of playback.

See also setPlaybackRate().

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

Returns the current playback position in milliseconds.

See also setPosition().

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

Sets the current 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.

Setting the media to a 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, a 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.

See also media().

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

Sets the mute state of a player control.

See also isMuted().

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

Sets the rate of playback.

See also 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.

See also position().

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

Sets the audio volume of a player control.

The volume is scaled linearly, ranging from 0 (silence) to 100 (full volume).

See also 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 state.

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

Returns the audio volume of a player control.

See also setVolume().