|qmake:||QT += ifmedia|
|QIfMediaPlayerBackendInterface(QObject *parent = nullptr)|
|virtual void||fetchData(const QUuid &identifier, int start, int count) = 0|
|virtual void||insert(int index, const QVariant &item) = 0|
|virtual void||move(int currentIndex, int newIndex) = 0|
|virtual void||next() = 0|
|virtual void||pause() = 0|
|virtual void||play() = 0|
|virtual void||previous() = 0|
|virtual void||remove(int index) = 0|
|virtual void||seek(qint64 offset) = 0|
|virtual void||setCurrentIndex(int currentIndex) = 0|
|virtual void||setMuted(bool muted) = 0|
|virtual void||setPlayMode(QIfMediaPlayer::PlayMode playMode) = 0|
|virtual void||setPosition(qint64 position) = 0|
|virtual void||setVolume(int volume) = 0|
|virtual void||stop() = 0|
|void||canReportCountChanged(bool canReportCount = false)|
|void||countChanged(int newLength = -1)|
|void||currentIndexChanged(int currentIndex = -1)|
|void||currentTrackChanged(const QVariant ¤tTrack = QVariant())|
|void||dataChanged(const QList<QVariant> &data, int start, int count)|
|void||dataFetched(const QUuid &identifier, const QList<QVariant> &data, int start, bool moreAvailable)|
|void||durationChanged(qint64 duration = -1)|
|void||mutedChanged(bool muted = false)|
|void||playModeChanged(QIfMediaPlayer::PlayMode playMode = QIfMediaPlayer::Normal)|
|void||playStateChanged(QIfMediaPlayer::PlayState playState = QIfMediaPlayer::Stopped)|
|void||positionChanged(qint64 position = -1)|
|void||volumeChanged(int volume = -1)|
The QIfMediaPlayerBackendInterface is the interface used by QIfMediaPlayer
The interface is discovered by a QIfMediaPlayer object, which connects to it and sets it up.
<example of a fully featured backend>
Member Function Documentation
QIfMediaPlayerBackendInterface::QIfMediaPlayerBackendInterface(QObject *parent = nullptr)
Constructs a backend interface.
The parent is sent to the QObject constructor.
This signal is emitted if the backend can return the final number of items (canReportCount) for a specific request. This makes it possible to support the QIfPlayQueue::DataChanged loading type. The number of items can then be returned by emitting the countChanged signal.
See also countChanged().
This signal is emitted once the backend knows about the new size of the play queue. The new number of items is returned as newLength.
This signal is expected to be emitted before the data is returned by emitting the dataFetched() signal.
Emitted when the currently played playable item in the play queue changed. The index of the new current playable item will be passed as currentIndex.
[signal] void QIfMediaPlayerBackendInterface::currentTrackChanged(const QVariant ¤tTrack = QVariant())
Emitted when the currently played playable item changed. The new playable item will be passed as currentTrack.
[signal] void QIfMediaPlayerBackendInterface::dataChanged(const QList<QVariant> &data, int start, int count)
This signal is emitted whenever the play queue changes, e.g. by a insert, remove or a move operation. The data argument holds the new data which will replace the data starting at start until count.
If data is empty the rows identified by the range of start and count will be removed. If count is 0, data will be inserted at start.
For inserting a new item, the item is passed in data and start is used for where the item should be inserted, the count argument needs to be 0 as we don't want to replace existing data:
Removing an item is very similar, start is used to indicate which item and count to indicate how much:
list.removeAt(index); emit dataChanged(QVariantList(), index, 1);
[signal] void QIfMediaPlayerBackendInterface::dataFetched(const QUuid &identifier, const QList<QVariant> &data, int start, bool moreAvailable)
This signal is emitted as a result of a call to fetchData() and returns the requested data to the QIfPlayQueue instance identified by identifier. The arguments start holds the index where the data starts, moreAvailable holds whether there is more data available. To retrieve this data, use a new fetchData() call.
See also fetchData() and dataFetched().
[signal] void QIfMediaPlayerBackendInterface::durationChanged(qint64 duration = -1)
Emitted when the duration of the currently playing playable item changed. The new duration will be passed as duration in ms.
Emitted when the player changes its mute state. The player is muted when muted is set to true.
[signal] void QIfMediaPlayerBackendInterface::playModeChanged(QIfMediaPlayer::PlayMode playMode = QIfMediaPlayer::Normal)
Emitted when the play mode changed. The new play mode will be passed as playMode.
[signal] void QIfMediaPlayerBackendInterface::playStateChanged(QIfMediaPlayer::PlayState playState = QIfMediaPlayer::Stopped)
Emitted when the play state changed. The new play state will be passed as playState.
[signal] void QIfMediaPlayerBackendInterface::positionChanged(qint64 position = -1)
Emitted when the position of the currently playing playable item changed. The new position will be passed as position in ms.
Emitted when the volume of this player changed. The new volume of the player will be passed as volume.
[pure virtual] void QIfMediaPlayerBackendInterface::fetchData(const QUuid &identifier, int start, int count)
This function is called whenever new playable items needs to be retrieved by the QIfPlayQueue.
The parameters start and count define the range of data to be fetched. This method is expected to emit the dataFetched() signal when the new data is ready. Use identifier to identify the calling QIfPlayQueue instance.
See also dataFetched().
[pure virtual] void QIfMediaPlayerBackendInterface::insert(int index, const QVariant &item)
Adds the playable item identitifed by item into the play queue at index.
See also dataChanged().
Moves the playable item at position currentIndex of the play queue to the new position newIndex.
See also dataChanged().
Skips to the next playable item.
Pauses the playback of the current playable item.
Starts playing the current playable item.
Skips to the previous playable item.
Removes the playable item at position index from the play queue.
See also dataChanged().
[pure virtual] void QIfMediaPlayerBackendInterface::seek(qint64 offset)
Seeks the current playable item using offset in ms.
The offset can be positive or negative to either seek forward or backward. A successful seek will result in a change of the position property.
Sets the currentIndex of the play-queue to the given index. If a valid index is passed, the function should update the current playable item and emit the corresponding change signals
When muted is set to true, the player will be muted and un-muted otherwise.
See also mutedChanged.
[pure virtual] void QIfMediaPlayerBackendInterface::setPlayMode(QIfMediaPlayer::PlayMode playMode)
Sets playMode as the new playback mode for the player. If a valid playMode is passed, the function should emit the corresponding change signal.
See also playModeChanged.
[pure virtual] void QIfMediaPlayerBackendInterface::setPosition(qint64 position)
Sets the position of the currently playing item. If a valid position is passed, the function should emit the corresponding change signals
See also positionChanged.
Sets the current player volume. The value needs to be between 0 and 100.
See also volumeChanged.
Stops playing the current playable item.
See also play() and stop().
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