C
QMediaSessionController Class
The QMediaSessionController class controls the current media being played on a device. 
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| Header: | #include <QMediaSessionController> |
| CMake: | find_package(Qt6 REQUIRED COMPONENTS AndroidAutomotiveMedia)target_link_libraries(mytarget PRIVATE Qt6::AndroidAutomotiveMedia) |
| qmake: | QT += media |
| Since: | QtAndroidAutomotive 6.5 |
| Inherits: | QObject |
Public Types
| enum | PlaybackAction { NoAction, PlayAction, PauseAction, StopAction, SkipToNextAction, …, PositionAction } |
| flags | PlaybackActions |
| enum | PlaybackState { NoState, PausedState, PlayingState, StoppedState, BufferingState, …, ErrorState } |
Public Functions
| QMediaSessionController::PlaybackActions | availableActions() const |
| float | bufferProgress() const |
| qint64 | duration() const |
| QMediaMetaData | metaData() const |
| qreal | playbackRate() const |
| QMediaSessionController::PlaybackState | playbackState() const |
| qint64 | position() const |
Public Slots
| void | pause() |
| void | play() |
| void | setPlaybackRate(qreal rate) |
| void | setPosition(qint64 position) |
| void | skipToNext() |
| void | skipToPrevious() |
| void | stop() |
Signals
| void | availableActionsChanged() |
| void | bufferProgressChanged() |
| void | durationChanged() |
| void | metaDataChanged() |
| void | playbackRateChanged() |
| void | playbackStateChanged() |
| void | positionChanged() |
Detailed Description
QMediaSessionController provides functions to control media playback, and retrieve media information, such as metadata.
This class is instantiated by QMediaSessionManager when it gets notified by the system about a new media controller being added or deleted. To get access to the controllers, use QMediaSessionManager::activeControllers().
Member Type Documentation
enum QMediaSessionController::PlaybackAction
flags QMediaSessionController::PlaybackActions
These flags indicate the actions that the controller can have, and use to hide UI controls if the media does not support that action. For example, if the media supports play, pause, stop actions.
| Constant | Value | Description |
|---|---|---|
QMediaSessionController::NoAction | 0 | Unknown or undefined action |
QMediaSessionController::PlayAction | 1 << 0 | The media can be played |
QMediaSessionController::PauseAction | 1 << 1 | The media can be paused |
QMediaSessionController::StopAction | 1 << 2 | The media can be stopped |
QMediaSessionController::SkipToNextAction | 1 << 3 | The media supports skipping to next media |
QMediaSessionController::SkipToPreviousAction | 1 << 4 | The media supports skipping to previous media |
QMediaSessionController::PlaybackRateAction | 1 << 5 | The media supports changing the playback rate |
QMediaSessionController::PositionAction | 1 << 6 | The media supports changing the current playback position |
Note: For Android, the PlaybackRateAction action requires minimum SDK version 31 (Android 12)
The PlaybackActions type is a typedef for QFlags<PlaybackAction>. It stores an OR combination of PlaybackAction values.
enum QMediaSessionController::PlaybackState
This enum specifies the states that the controller can have. For example, if the media is playing, paused, etc.
| Constant | Value | Description |
|---|---|---|
QMediaSessionController::NoState | 0 | The media is in an unknown state or the state cannot be retrieved |
QMediaSessionController::PausedState | 1 | The media is paused |
QMediaSessionController::PlayingState | 2 | The media is playing |
QMediaSessionController::StoppedState | 3 | The media is stopped |
QMediaSessionController::BufferingState | 4 | The media is buffering |
QMediaSessionController::SkippingToNextState | 5 | The media is skipping to the next track |
QMediaSessionController::SkippingToPreviousState | 6 | The media is skipping to the previous track |
QMediaSessionController::ErrorState | 7 | There was an error in the media or while retrieving the state of the media |
Member Function Documentation
QMediaSessionController::PlaybackActions QMediaSessionController::availableActions() const
Returns the available actions for the media.
[signal] void QMediaSessionController::availableActionsChanged()
This signal is emitted when the available actions for the media have changed.
float QMediaSessionController::bufferProgress() const
Returns how much of the media playback buffer is currently filled, from 0.0 (empty) to 1.0 (full).
[signal] void QMediaSessionController::bufferProgressChanged()
This signal is emitted when the buffer progress of the media has changed.
qint64 QMediaSessionController::duration() const
Returns the duration of the media in milliseconds. Can also be retrieved from QMediaMetaData::Duration.
[signal] void QMediaSessionController::durationChanged()
This signal is emitted when the duration of the media has changed.
QMediaMetaData QMediaSessionController::metaData() const
Returns the metadata of the media.
[signal] void QMediaSessionController::metaDataChanged()
This signal is emitted when the metaData has changed for the media.
[slot] void QMediaSessionController::pause()
Pauses the media.
[slot] void QMediaSessionController::play()
Starts or resumes the media.
qreal QMediaSessionController::playbackRate() const
Returns the playback rate of the media. 1 means that the media is playing at the normal rate. 2 means that media is playing at double rate. Negative values mean that the media is rewinding.
Returns 1 if failed to retrieve a valid playbackRate for the media.
See also QMediaSessionController::setPlaybackRate(qreal rate).
[signal] void QMediaSessionController::playbackRateChanged()
This signal is emitted when the playback rate of the media has changed.
QMediaSessionController::PlaybackState QMediaSessionController::playbackState() const
Returns the Playback State of the media.
Returns QMediaSessionController::NoState if unknown state or failed to retrieve a valid state.
[signal] void QMediaSessionController::playbackStateChanged()
This signal is emitted when the playback state has changed for the media.
qint64 QMediaSessionController::position() const
Returns the current playback position of the media in milliseconds.
Returns 0 if failed to retrieve a valid position.
See also QMediaSessionController::setPosition(qint64 position).
[signal] void QMediaSessionController::positionChanged()
This signal is emitted when the playback position of the media has changed.
It is emitted every 100 milliseconds while the media is playing.
[slot] void QMediaSessionController::setPlaybackRate(qreal rate)
Sets the playback rate of the media.
On Android, passing the rate as 0 is ignored as it is not valid.
See also playbackRate().
[slot] void QMediaSessionController::setPosition(qint64 position)
Sets the playback position of the media in milliseconds.
The value is ignored if position is less than 0 or greater than duration
See also QMediaSessionController::position().
[slot] void QMediaSessionController::skipToNext()
Plays the next media in the queue of the application playing the media.
[slot] void QMediaSessionController::skipToPrevious()
Plays the previous media in the queue of the application playing the media.
[slot] void QMediaSessionController::stop()
Stops the media.
Available under certain Qt licenses.
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