- Qt 5.5
- Qt Multimedia
- C++ Classes
- QMediaPlayer
- Qt 5.5.1 Reference Documentation

# QMediaPlayer Class

The QMediaPlayer class allows the playing of a media source. More...

Header: | #include <QMediaPlayer>
qmake: | QT += multimedia
Inherits: | QMediaObject

- List of all members, including inherited members
- Obsolete members

## Public Types

enum | Error { NoError, ResourceError, FormatError, NetworkError, AccessDeniedError, ServiceMissingError }
enum | Flag { LowLatency, StreamPlayback, VideoSurface }
flags | Flags
enum | MediaStatus { UnknownMediaStatus, NoMedia, LoadingMedia, LoadedMedia, ..., InvalidMedia }
enum | State { StoppedState, PlayingState, PausedState }

## Properties

audioAvailable : const bool bufferStatus : const int currentMedia : const QMediaContent duration : const qint64 error : const QString media : QMediaContent mediaStatus : const MediaStatus muted : bool | playbackRate : qreal playlist : QMediaPlaylist * position : qint64 seekable : const bool state : const State videoAvailable : const bool volume : int

- 1 property inherited from QMediaObject

## Public Functions

| QMediaPlayer(QObject * parent = 0, Flags flags = 0)
| ~QMediaPlayer()
int | bufferStatus() const
QMediaContent | currentMedia() const
QNetworkConfiguration | currentNetworkConfiguration() const
qint64 | duration() const
Error | error() const
QString | errorString() const
bool | isAudioAvailable() const
bool | isMuted() const
bool | isSeekable() const
bool | isVideoAvailable() const
QMediaContent | media() const
MediaStatus | mediaStatus() const
const QIODevice * | mediaStream() const
qreal | playbackRate() const
QMediaPlaylist * | playlist() const
qint64 | position() const
void | setVideoOutput(QVideoWidget * output)
void | setVideoOutput(QGraphicsVideoItem * output)
void | setVideoOutput(QAbstractVideoSurface * surface)
State | state() const
int | volume() const

## Reimplemented Public Functions

virtual QMultimedia::AvailabilityStatus | availability() const

- 10 public functions inherited from QMediaObject

## Public Slots

void | pause()
void | play()
void | setMedia(const QMediaContent & media, QIODevice * stream = 0)
void | setMuted(bool muted)
void | setNetworkConfigurations(const QList<QNetworkConfiguration> & configurations)
void | setPlaybackRate(qreal rate)
void | setPlaylist(QMediaPlaylist * playlist)
void | setPosition(qint64 position)
void | setVolume(int volume)
void | stop()

## Signals

void | audioAvailableChanged(bool available)
void | bufferStatusChanged(int percentFilled)
void | currentMediaChanged(const QMediaContent & media)
void | durationChanged(qint64 duration)
void | error(QMediaPlayer::Error error)
void | mediaChanged(const QMediaContent & media)
void | mediaStatusChanged(QMediaPlayer::MediaStatus status)
void | mutedChanged(bool muted)
void | networkConfigurationChanged(const QNetworkConfiguration & configuration)
void | playbackRateChanged(qreal rate)
void | positionChanged(qint64 position)
void | seekableChanged(bool seekable)
void | stateChanged(QMediaPlayer::State state)
void | videoAvailableChanged(bool videoAvailable)
void | volumeChanged(int volume)

- 6 signals inherited from QMediaObject

## Static Public Members

QMultimedia::SupportEstimate | hasSupport(const QString & mimeType, const QStringList & codecs = QStringList(), Flags flags = 0)

### Additional Inherited Members

- 2 protected functions inherited from QMediaObject

## Detailed Description

The QMediaPlayer class allows the playing of a media source.

The QMediaPlayer class is a high level media playback class. It can be used to playback such content as songs, movies and internet radio. The content to playback is specified as a QMediaContent object, which can be thought of as a main or canonical URL with additional information attached. When provided with a QMediaContent playback may be able to commence.

    player = new QMediaPlayer;
    connect(player, SIGNAL(positionChanged(qint64)), this, SLOT(positionChanged(qint64)));
    player->setMedia(QUrl::fromLocalFile("/Users/me/Music/coolsong.mp3"));
    player->setVolume(50);
    player->play();

QVideoWidget can be used with QMediaPlayer for video rendering and QMediaPlaylist for accessing playlist functionality.

    playlist = new QMediaPlaylist;
    playlist->addMedia(QUrl("http://example.com/movie1.mp4"));
    playlist->addMedia(QUrl("http://example.com/movie2.mp4"));
    playlist->addMedia(QUrl("http://example.com/movie3.mp4"));
    playlist->setCurrentIndex(1);

    player = new QMediaPlayer;
    player->setPlaylist(playlist);

    videoWidget = new QVideoWidget;
    player->setVideoOutput(videoWidget);
    videoWidget->show();

    player->play();

Since QMediaPlayer is a QMediaObject, you can use several of the QMediaObject functions for things like:

- Accessing the currently playing media's metadata (QMediaObject::metaData() and predefined meta-data keys)
- Checking to see if the media playback service is currently available (QMediaObject::availability())

See also QMediaObject, QMediaService, QVideoWidget, and QMediaPlaylist.

## Member Type Documentation

### enum QMediaPlayer::Error

Defines a media player error condition.

Constant | Value | Description
--- | --- | ---
`QMediaPlayer::NoError` | `0` | No error has occurred.
`QMediaPlayer::ResourceError` | `1` | A media resource couldn't be resolved.
`QMediaPlayer::FormatError` | `2` | The format of a media resource isn't (fully) supported. Playback may still be possible, but without an audio or video component.
`QMediaPlayer::NetworkError` | `3` | A network error occurred.
`QMediaPlayer::AccessDeniedError` | `4` | There are not the appropriate permissions to play a media resource.
`QMediaPlayer::ServiceMissingError` | `5` | A valid playback service was not found, playback cannot proceed.

### enum QMediaPlayer::Flag
flags QMediaPlayer::Flags

Constant | Value | Description
--- | --- | ---
`QMediaPlayer::LowLatency` | `0x01` | The player is expected to be used with simple audio formats, but playback should start without significant delay. Such playback service can be used for beeps, ringtones, etc.
`QMediaPlayer::StreamPlayback` | `0x02` | The player is expected to play QIODevice based streams. If passed to QMediaPlayer constructor, the service supporting streams playback will be chosen.
`QMediaPlayer::VideoSurface` | `0x04` | The player is expected to be able to render to a QAbstractVideoSurface output.

The Flags type is a typedef for QFlags<Flag>. It stores an OR combination of Flag values.

### enum QMediaPlayer::MediaStatus

Defines the status of a media player's current media.

Constant | Value | Description
--- | --- | ---
`QMediaPlayer::UnknownMediaStatus` | `0` | The status of the media cannot be determined.
`QMediaPlayer::NoMedia` | `1` | The is no current media. The player is in the StoppedState.
`QMediaPlayer::LoadingMedia` | `2` | The current media is being loaded. The player may be in any state.
`QMediaPlayer::LoadedMedia` | `3` | The current media has been loaded. The player is in the StoppedState.
`QMediaPlayer::StalledMedia` | `4` | Playback of the current media has stalled due to insufficient buffering or some other temporary interruption. The player is in the PlayingState or PausedState.
`QMediaPlayer::BufferingMedia` | `5` | The player is buffering data but has enough data buffered for playback to continue for the immediate future. The player is in the PlayingState or PausedState.
`QMediaPlayer::BufferedMedia` | `6` | The player has fully buffered the current media. The player is in the PlayingState or PausedState.
`QMediaPlayer::EndOfMedia` | `7` | Playback has reached the end of the current media. The player is in the StoppedState.
`QMediaPlayer::InvalidMedia` | `8` | The current media cannot be played. The player is in the StoppedState.

### enum QMediaPlayer::State

Defines the current state of a media player.

Constant | Value | Description
--- | --- | ---
`QMediaPlayer::StoppedState` | `0` | The media player is not playing content, playback will begin from the start of the current track.
`QMediaPlayer::PlayingState` | `1` | The media player is currently playing content.
`QMediaPlayer::PausedState` | `2` | The media player has paused playback, playback of the current track will resume from the position the player was paused at.

## Property Documentation

### audioAvailable : const bool

This property holds the audio availabilty status for the current media.

As the life time of QMediaPlayer can be longer than the playback of one QMediaContent, this property may change over time, the audioAvailableChanged signal can be used to monitor it's status.

Access functions:

bool | isAudioAvailable() const

Notifier signal:

void | audioAvailableChanged(bool available)

### bufferStatus : const int

This property holds the percentage of the temporary buffer filled before playback begins or resumes, from (empty) to (full).

When the player object is buffering; this property holds the percentage of the temporary buffer that is filled. The buffer will need to reach 100% filled before playback can start or resume, at which time mediaStatus() will return BufferedMedia or BufferingMedia. If the value is anything lower than `100`, mediaStatus() will return StalledMedia.

Access functions:

int | bufferStatus() const

Notifier signal:

void | bufferStatusChanged(int percentFilled)

See also mediaStatus().

### currentMedia : const QMediaContent

This property holds the current active media content being played by the player object. This value could be different from QMediaPlayer::media property if a playlist is used. In this case currentMedia indicates the current media content being processed by the player, while QMediaPlayer::media property contains the original playlist.

Access functions:

QMediaContent | currentMedia() const

Notifier signal:

void | currentMediaChanged(const QMediaContent & media)

See also QMediaContent and media().

### duration : const qint64

This property holds the duration of the current media.

The value is the total playback time in milliseconds of the current media. The value may change across the life time of the QMediaPlayer object and may not be available when initial playback begins, connect to the durationChanged() signal to receive status notifications.

Access functions:

qint64 | duration() const

Notifier signal:

void | durationChanged(qint64 duration)

### error : const QString

This property holds a string describing the last error condition.

Access functions:

QString | errorString() const

See also error().

### media : QMediaContent

This property holds the active media source being used by the player object.

The player object will use the QMediaContent for selection of the content to be played.

By default this property has a null QMediaContent.

Setting this property to a null QMediaContent will cause the player to discard all information relating to the current media source and to cease all I/O operations related to that media.

Access functions:

QMediaContent | media() const
void | setMedia(const QMediaContent & media, QIODevice * stream = 0)

Notifier signal:

void | mediaChanged(const QMediaContent & media)

See also QMediaContent and currentMedia().

### mediaStatus : const MediaStatus

This property holds the status of the current media stream.

The stream status describes how the playback of the current stream is progressing.

By default this property is QMediaPlayer::NoMedia

Access functions:

MediaStatus | mediaStatus() const

Notifier signal:

void | mediaStatusChanged(QMediaPlayer::MediaStatus status)

See also state.

### muted : bool

This property holds the muted state of the current media.

The value will be true if the playback volume is muted; otherwise false.

Access functions:

bool | isMuted() const
void | setMuted(bool muted)

Notifier signal:

void | mutedChanged(bool muted)

### playbackRate : qreal

This property holds the playback rate of the current media.

This value is a multiplier applied to the media's standard play rate. By default this value is 1.0, indicating that the media is playing at the standard pace. Values higher than 1.0 will increase the rate of play. Values less than zero can be set and indicate the media will rewind at the multiplier of the standard pace.

Not all playback services support change of the playback rate. It is framework defined as to the status and quality of audio and video while fast forwarding or rewinding.

Access functions:

qreal | playbackRate() const
void | setPlaybackRate(qreal rate)

Notifier signal:

void | playbackRateChanged(qreal rate)

### playlist : QMediaPlaylist *

This property holds the media playlist being used by the player object.

The player object will use the current playlist item for selection of the content to be played.

By default this property is set to null.

If the media playlist is used as a source, QMediaPlayer::currentMedia is updated with a current playlist item. The current source should be selected with QMediaPlaylist::setCurrentIndex(int) instead of QMediaPlayer::setMedia(), otherwise the current playlist will be discarded.

Access functions:

QMediaPlaylist * | playlist() const
void | setPlaylist(QMediaPlaylist * playlist)

See also QMediaContent.

### position : qint64

This property holds the playback position of the current media.

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 signal positionChanged(), the interval between updates can be set with QMediaObject's method setNotifyInterval().

Access functions:

qint64 | position() const
void | setPosition(qint64 position)

Notifier signal:

void | positionChanged(qint64 position)

### seekable : const bool

This property holds the seek-able status of the current media.

If seeking is supported this property will be true; false otherwise. The status of this property may change across the life time of the QMediaPlayer object, use the seekableChanged signal to monitor changes.

Access functions:

bool | isSeekable() const

Notifier signal:

void | seekableChanged(bool seekable)

### state : const State

This property holds the media player's playback state.

By default this property is QMediaPlayer::Stopped

Access functions:

State | state() const

Notifier signal:

void | stateChanged(QMediaPlayer::State state)

See also mediaStatus(), play(), pause(), and stop().

### videoAvailable : const bool

This property holds the video availability status for the current media.

If available, the QVideoWidget class can be used to view the video. As the life time of QMediaPlayer can be longer than the playback of one QMediaContent, this property may change over time, the videoAvailableChanged signal can be used to monitor it's status.

Access functions:

bool | isVideoAvailable() const

Notifier signal:

void | videoAvailableChanged(bool videoAvailable)

See also QVideoWidget and QMediaContent.

### volume : int

This property holds the current playback volume.

The playback volume is linear in effect and the value can range from 0 - 100, values outside this range will be clamped.

Access functions:

int | volume() const
void | setVolume(int volume)

Notifier signal:

void | volumeChanged(int volume)

## Member Function Documentation

### QMediaPlayer::QMediaPlayer(QObject * parent = 0, Flags flags = 0)

Construct a QMediaPlayer instance parented to parent and with flags.

### QMediaPlayer::~QMediaPlayer()

Destroys the player object.

### `[virtual]` QMultimedia::AvailabilityStatus QMediaPlayer::availability() const

Reimplemented from QMediaObject::availability().

### QNetworkConfiguration QMediaPlayer::currentNetworkConfiguration() const

Returns the current network access point in use. If a default contructed QNetworkConfiguration is returned this feature is not available or that none of the current supplied configurations are in use.

### Error QMediaPlayer::error() const

Returns the current error state.

### `[signal]` void QMediaPlayer::error(QMediaPlayer::Error error)

Signals that an error condition has occurred.

See also errorString().

### `[static]` QMultimedia::SupportEstimate QMediaPlayer::hasSupport(const QString & mimeType, const QStringList & codecs = QStringList(), Flags flags = 0)

Returns the level of support a media player has for a mimeType and a set of codecs.

The flags argument allows additional requirements such as performance indicators to be specified.

### const QIODevice * QMediaPlayer::mediaStream() const

Returns the stream source of media data.

This is only valid if a stream was passed to setMedia().

See also setMedia().

### `[signal]` void QMediaPlayer::networkConfigurationChanged(const QNetworkConfiguration & configuration)

Signal that the active in use network access point has been changed to configuration and all subsequent network access will use this configuration.

### `[slot]` void QMediaPlayer::pause()

Pause playing the current source.

### `[slot]` void QMediaPlayer::play()

Start or resume playing the current source.

### `[slot]` void QMediaPlayer::setNetworkConfigurations(const QList<QNetworkConfiguration> & configurations)

Sets the network access points for remote media playback. configurations contains, in ascending preferential order, a list of configuration that can be used for network access.

This will invalidate the choice of previous configurations.

### void QMediaPlayer::setVideoOutput(QVideoWidget * output)

Attach a QVideoWidget video output to the media player.

If the media player has already video output attached, it will be replaced with a new one.

### void QMediaPlayer::setVideoOutput(QGraphicsVideoItem * output)

Attach a QGraphicsVideoItem video output to the media player.

If the media player has already video output attached, it will be replaced with a new one.

### void QMediaPlayer::setVideoOutput(QAbstractVideoSurface * surface)

Sets a video surface as the video output of a media player.

If a video output has already been set on the media player the new surface will replace it.

### `[slot]` void QMediaPlayer::stop()

Stop playing, and reset the play position to the beginning.