Phonon::MediaObject
#include <phonon/MediaObject>
Properties | |
qint32 | prefinishMark |
qint32 | tickInterval |
qint32 | transitionTime |
Properties inherited from QObject | |
objectName | |
Signals | |
void | aboutToFinish () |
void | bufferStatus (int percentFilled) |
void | currentSourceChanged (const Phonon::MediaSource &newSource) |
void | finished () |
void | hasVideoChanged (bool hasVideo) |
void | metaDataChanged () |
void | prefinishMarkReached (qint32 msecToEnd) |
void | seekableChanged (bool isSeekable) |
void | stateChanged (Phonon::State newstate, Phonon::State oldstate) |
void | tick (qint64 time) |
void | totalTimeChanged (qint64 newTotalTime) |
Public Slots | |
void | clear () |
void | pause () |
void | play () |
void | seek (qint64 time) |
void | setTickInterval (qint32 newTickInterval) |
void | stop () |
Public Member Functions | |
MediaObject (const MediaSource &, QObject *parent) | |
~MediaObject () override | |
void | clearQueue () |
bool | closePort (const Port &) |
MediaSource | currentSource () const |
QList< SubStreamDescription > | currentSubStreams (MediaStreamType=AllMedia) |
qint64 | currentTime () const |
QList< DecoderParameter > | decoderParameters (const Port &port) |
QWidget * | decoderParameterWidget (const Port &port) |
void | enqueue (const MediaSource &source) |
void | enqueue (const QList< MediaSource > &sources) |
void | enqueue (const QList< QUrl > &urls) |
QString | errorString () const |
ErrorType | errorType () const |
bool | hasVideo () const |
bool | isPortValid (const Port &p) |
bool | isSeekable () const |
QMultiMap< QString, QString > | metaData () const |
QStringList | metaData (const QString &key) const |
QStringList | metaData (Phonon::MetaData key) const |
Port | openPort (MediaStreamType type, const char *format=0) |
qint32 | prefinishMark () const |
QList< MediaSource > | queue () const |
qint64 | remainingTime () const |
bool | selectSubstream (SubStreamDescription, const Port &port=Port()) |
void | setCurrentSource (const MediaSource &source) |
void | setPrefinishMark (qint32 msecToEnd) |
void | setQueue (const QList< MediaSource > &sources) |
void | setQueue (const QList< QUrl > &urls) |
void | setTransitionTime (qint32 msec) |
State | state () const |
qint32 | tickInterval () const |
qint64 | totalTime () const |
qint32 | transitionTime () const |
Public Member Functions inherited from QObject | |
QObject (QObject *parent) | |
QBindable< QString > | bindableObjectName () |
bool | blockSignals (bool block) |
const QObjectList & | children () const const |
QMetaObject::Connection | connect (const QObject *sender, const char *signal, const char *method, Qt::ConnectionType type) const const |
void | deleteLater () |
void | destroyed (QObject *obj) |
bool | disconnect (const char *signal, const QObject *receiver, const char *method) const const |
bool | disconnect (const QObject *receiver, const char *method) const const |
void | dumpObjectInfo () const const |
void | dumpObjectTree () const const |
QList< QByteArray > | dynamicPropertyNames () const const |
virtual bool | event (QEvent *e) |
virtual bool | eventFilter (QObject *watched, QEvent *event) |
T | findChild (const QString &name, Qt::FindChildOptions options) const const |
QList< T > | findChildren (const QRegularExpression &re, Qt::FindChildOptions options) const const |
QList< T > | findChildren (const QString &name, Qt::FindChildOptions options) const const |
QList< T > | findChildren (Qt::FindChildOptions options) const const |
bool | inherits (const char *className) const const |
void | installEventFilter (QObject *filterObj) |
bool | isQuickItemType () const const |
bool | isWidgetType () const const |
bool | isWindowType () const const |
void | killTimer (int id) |
virtual const QMetaObject * | metaObject () const const |
void | moveToThread (QThread *targetThread) |
QString | objectName () const const |
void | objectNameChanged (const QString &objectName) |
QObject * | parent () const const |
QVariant | property (const char *name) const const |
Q_CLASSINFO (Name, Value) | |
Q_EMIT Q_EMIT | |
Q_ENUM (...) | |
Q_ENUM_NS (...) | |
Q_ENUMS (...) | |
Q_FLAG (...) | |
Q_FLAG_NS (...) | |
Q_FLAGS (...) | |
Q_GADGET Q_GADGET | |
Q_GADGET_EXPORT (EXPORT_MACRO) | |
Q_INTERFACES (...) | |
Q_INVOKABLE Q_INVOKABLE | |
Q_MOC_INCLUDE Q_MOC_INCLUDE | |
Q_NAMESPACE Q_NAMESPACE | |
Q_NAMESPACE_EXPORT (EXPORT_MACRO) | |
Q_OBJECT Q_OBJECT | |
Q_PROPERTY (...) | |
Q_REVISION Q_REVISION | |
Q_SET_OBJECT_NAME (Object) | |
Q_SIGNAL Q_SIGNAL | |
Q_SIGNALS Q_SIGNALS | |
Q_SLOT Q_SLOT | |
Q_SLOTS Q_SLOTS | |
T | qobject_cast (const QObject *object) |
T | qobject_cast (QObject *object) |
QT_NO_NARROWING_CONVERSIONS_IN_CONNECT QT_NO_NARROWING_CONVERSIONS_IN_CONNECT | |
void | removeEventFilter (QObject *obj) |
void | setObjectName (const QString &name) |
void | setObjectName (QAnyStringView name) |
void | setParent (QObject *parent) |
bool | setProperty (const char *name, const QVariant &value) |
bool | setProperty (const char *name, QVariant &&value) |
bool | signalsBlocked () const const |
int | startTimer (int interval, Qt::TimerType timerType) |
int | startTimer (std::chrono::milliseconds interval, Qt::TimerType timerType) |
QThread * | thread () const const |
Additional Inherited Members | |
Public Types inherited from QObject | |
typedef | QObjectList |
Static Public Member Functions inherited from QObject | |
QMetaObject::Connection | connect (const QObject *sender, const char *signal, const QObject *receiver, const char *method, Qt::ConnectionType type) |
QMetaObject::Connection | connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type) |
QMetaObject::Connection | connect (const QObject *sender, PointerToMemberFunction signal, const QObject *context, Functor functor, Qt::ConnectionType type) |
QMetaObject::Connection | connect (const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method, Qt::ConnectionType type) |
QMetaObject::Connection | connect (const QObject *sender, PointerToMemberFunction signal, Functor functor) |
bool | disconnect (const QMetaObject::Connection &connection) |
bool | disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *method) |
bool | disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method) |
bool | disconnect (const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method) |
QString | tr (const char *sourceText, const char *disambiguation, int n) |
Protected Member Functions inherited from QObject | |
virtual void | childEvent (QChildEvent *event) |
virtual void | connectNotify (const QMetaMethod &signal) |
virtual void | customEvent (QEvent *event) |
virtual void | disconnectNotify (const QMetaMethod &signal) |
bool | isSignalConnected (const QMetaMethod &signal) const const |
int | receivers (const char *signal) const const |
QObject * | sender () const const |
int | senderSignalIndex () const const |
virtual void | timerEvent (QTimerEvent *event) |
Detailed Description
Interface for media playback of a given URL.
This class is the most important class in Phonon. Use it to open a media file at an arbitrary location, a CD or DVD or to stream media data from the application to the backend.
This class controls the state (play, pause, stop, seek) and you can use it to get a lot of information about the media data.
Notice that most functions of this class are asynchronous. That means if you call play() the object only starts playing when the stateChanged() signal tells you that the object changed into PlayingState. The states you can expect are documented for those methods.
A common usage example is the following:
If you want to play more than one media file (one after another) you can either tell MediaObject about all those files
or provide the next file just in time:
This integration is opt-in only and can be enabled by setting the PlaybackTracking property to true:
This kind of information is normally used to provide a universal history view to the user, such as what songs were played when, regardless of the media player. This is in addition to any emails read, IM conversations, websites viewed, etc.
Definition at line 25 of file Phonon-Graph.cpp.
Property Documentation
◆ prefinishMark
|
readwrite |
Get a signal before playback finishes.
This property specifies the time in milliseconds the prefinishMarkReached signal is emitted before the playback finishes. A value of 0
disables the signal.
Defaults to 0
(disabled).
- Warning
- For some media data the total time cannot be determined accurately, therefore the accuracy of the prefinishMarkReached signal can be bad sometimes. Still, it is better to use this method than to look at totalTime() and currentTime() to emulate the behaviour because the backend might have more information available than your application does through totalTime and currentTime.
- See also
- prefinishMarkReached
Definition at line 136 of file mediaobject.h.
◆ tickInterval
|
readwrite |
The time interval in milliseconds between two ticks.
The tick interval is the time that elapses between the emission of two tick signals. If you set the interval to 0
the tick signal gets disabled.
Defaults to 0
(disabled).
- Warning
- The back-end is free to choose a different tick interval close to what you asked for. This means that the following code may fail: On the other hand the following is guaranteed:int x = 200;media->setTickInterval(x);Q_ASSERT(x == producer->tickInterval());int x = 200;media->setTickInterval(x);Q_ASSERT(x >= producer->tickInterval() &&x <= 2 * producer->tickInterval());
- See also
- tick
Definition at line 163 of file mediaobject.h.
◆ transitionTime
|
readwrite |
Defines the time between media sources.
A positive transition time defines a gap of silence between queued media sources.
A transition time of 0 ms requests gapless playback (sample precise queueing of the next source).
A negative transition time defines a crossfade between the queued media sources.
Defaults to 0 (gapless playback).
- Warning
- This feature might not work reliably on every platform.
Definition at line 115 of file mediaobject.h.
Constructor & Destructor Documentation
◆ ~MediaObject()
|
override |
Destroys the MediaObject.
Definition at line 51 of file mediaobject.cpp.
Member Function Documentation
◆ aboutToFinish
|
signal |
Emitted before the playback of the whole queue stops.
When this signal is emitted you still have time to provide the next MediaSource (using enqueue()) so that playback continues.
This signal can be used to provide the next MediaSource just in time for the transition still to work.
- See also
- enqueue
◆ bufferStatus
|
signal |
Tells about the status of the buffer.
You can use this signal to show a progress bar to the user when in BufferingState:
- Parameters
-
percentFilled A number between 0 and 100 telling you how much the buffer is filled.
◆ clear
|
slot |
Stops and removes all playing and enqueued media sources.
- See also
- setCurrentSource
Definition at line 257 of file mediaobject.cpp.
◆ clearQueue()
void Phonon::MediaObject::clearQueue | ( | ) |
Clears the queue of sources.
Definition at line 309 of file mediaobject.cpp.
◆ closePort()
|
inline |
Definition at line 72 of file Phonon-Graph.cpp.
◆ currentSource()
MediaSource Phonon::MediaObject::currentSource | ( | ) | const |
Returns the current media source.
- See also
- setCurrentSource
Definition at line 223 of file mediaobject.cpp.
◆ currentSourceChanged
|
signal |
Emitted when the MediaObject makes a transition to the next MediaSource in the queue().
In other words, it is emitted when an individual MediaSource is finished.
- Parameters
-
newSource The source that starts to play at the time the signal is emitted.
◆ currentSubStreams()
|
inline |
Definition at line 50 of file Phonon-Graph.cpp.
◆ currentTime()
qint64 Phonon::MediaObject::currentTime | ( | ) | const |
Get the current time (in milliseconds) of the file currently being played.
- Returns
- The current time in milliseconds.
- See also
- tick
◆ decoderParameterWidget()
QWidget * Phonon::MediaObject::decoderParameterWidget | ( | const Port & | port | ) |
Returns 0 if there are no parameters for the given port/decoder.
◆ enqueue() [1/3]
void Phonon::MediaObject::enqueue | ( | const MediaSource & | source | ) |
Appends one source to the queue.
Use this function to provide the next source just in time after the aboutToFinish signal was emitted.
- See also
- aboutToFinish
- setQueue
- clearQueue
Definition at line 284 of file mediaobject.cpp.
◆ enqueue() [2/3]
void Phonon::MediaObject::enqueue | ( | const QList< MediaSource > & | sources | ) |
Appends multiple sources to the queue.
- See also
- setQueue
- clearQueue
Definition at line 295 of file mediaobject.cpp.
◆ enqueue() [3/3]
Appends multiple sources to the queue.
- See also
- setQueue
- clearQueue
Definition at line 302 of file mediaobject.cpp.
◆ errorString()
QString Phonon::MediaObject::errorString | ( | ) | const |
Returns a human-readable description of the last error that occurred.
Definition at line 132 of file mediaobject.cpp.
◆ errorType()
ErrorType Phonon::MediaObject::errorType | ( | ) | const |
Tells your program what to do about the error.
- See also
- Phonon::ErrorType
Definition at line 146 of file mediaobject.cpp.
◆ finished
|
signal |
Emitted when the object has finished playback.
It is not emitted if you call stop(), pause() or load(), but only on end-of-queue or a critical error.
- Warning
- This signal is not emitted when the current source has finished and there's another source in the queue. It is only emitted when the queue is empty.
◆ hasVideo()
bool Phonon::MediaObject::hasVideo | ( | ) | const |
Check whether the media data includes a video stream.
- Warning
- This information cannot be known immediately. It is best to also listen to the hasVideoChanged signal.
- Returns
true
if the media contains video data.false
otherwise.
- See also
- hasVideoChanged
◆ hasVideoChanged
|
signal |
Emitted whenever the return value of hasVideo() changes.
Normally you'll check hasVideo() first and then let this signal tell you whether video is available now or not. That way you don't have to poll hasVideo().
- Parameters
-
hasVideo true
The stream contains video and adding a VideoWidget will show a video.false
There is no video data in the stream and adding a VideoWidget will show an empty (black) VideoWidget.
◆ isPortValid()
|
inline |
Definition at line 76 of file Phonon-Graph.cpp.
◆ isSeekable()
bool Phonon::MediaObject::isSeekable | ( | ) | const |
Check whether the current media may be seeked.
- Warning
- This information cannot be known immediately. It is best to also listen to the seekableChanged signal.
- Returns
true
when the current media may be seeked.false
otherwise.
- See also
- seekableChanged()
◆ metaData() [1/3]
Returns all meta data.
Definition at line 189 of file mediaobject.cpp.
◆ metaData() [2/3]
QStringList Phonon::MediaObject::metaData | ( | const QString & | key | ) | const |
Returns the strings associated with the given key
.
Backends should use the keys specified in the Ogg Vorbis documentation: http://xiph.org/vorbis/doc/v-comment.html
Therefore the following should work with every backend:
A typical usage looks like this:
For Audio CDs you can query
to get a DiscID hash that you can use with the MusicBrainz service: http://musicbrainz.org/doc/ClientHOWTO
Definition at line 183 of file mediaobject.cpp.
◆ metaData() [3/3]
QStringList Phonon::MediaObject::metaData | ( | Phonon::MetaData | key | ) | const |
Returns the strings associated with the given key
.
Same as above except that the keys are defined in the Phonon::MetaData enum.
Definition at line 160 of file mediaobject.cpp.
◆ metaDataChanged
|
signal |
This signal is emitted whenever the audio/video data that is being played is associated with new meta data.
E.g. for radio streams this happens when the next song is played.
You can get the new meta data with the metaData methods.
◆ openPort()
|
inline |
Definition at line 67 of file Phonon-Graph.cpp.
◆ pause
|
slot |
Requests playback to pause.
If it was paused before nothing changes. If the media cannot be paused, some backends will internally call stop instead of pause.
- Possible states right after this call:
- PlayingState
- PausedState
- StoppedState
- ErrorState
Definition at line 108 of file mediaobject.cpp.
◆ play
|
slot |
Requests playback of the media data to start.
Playback only starts when stateChanged() signals that it goes into PlayingState, though.
- Possible states right after this call:
- BufferingState
- PlayingState
- ErrorState
Definition at line 100 of file mediaobject.cpp.
◆ prefinishMarkReached
|
signal |
Emitted when there are only msecToEnd
milliseconds left for playback.
- Parameters
-
msecToEnd The remaining time until the playback queue finishes.
- Warning
- This signal is not emitted when there is another source in the queue. It is only emitted when the queue is empty.
- See also
- setPrefinishMark
- prefinishMark
- aboutToFinish
- finished
◆ queue()
QList< MediaSource > Phonon::MediaObject::queue | ( | ) | const |
Returns the queued media sources.
This list does not include the current source (returned by currentSource).
Definition at line 264 of file mediaobject.cpp.
◆ remainingTime()
qint64 Phonon::MediaObject::remainingTime | ( | ) | const |
Get the remaining time (in milliseconds) of the file currently being played.
- Returns
- The remaining time in milliseconds.
Definition at line 210 of file mediaobject.cpp.
◆ seek
|
slot |
Requests a seek to the time indicated.
You can only seek if state() == PlayingState, BufferingState or PausedState.
The call is asynchronous, so currentTime can still be the old value right after this method was called. If all you need is a slider that shows the current position and allows the user to seek use the class SeekSlider.
- Parameters
-
time The time in milliseconds where to continue playing.
- Possible states right after this call:
- BufferingState
- PlayingState
- ErrorState
- See also
- SeekSlider
Definition at line 124 of file mediaobject.cpp.
◆ seekableChanged
|
signal |
Emitted whenever the return value of isSeekable() changes.
Normally you'll check isSeekable() first and then let this signal tell you whether seeking is possible now or not. That way you don't have to poll isSeekable().
◆ selectSubstream()
|
inline |
Definition at line 57 of file Phonon-Graph.cpp.
◆ setCurrentSource()
void Phonon::MediaObject::setCurrentSource | ( | const MediaSource & | source | ) |
Set the media source the MediaObject should use.
- Parameters
-
source The MediaSource object to the media data. You can just as well use a QUrl or QString (for a local file) here. Setting an empty (invalid) source, will stop and remove the current source.
- See also
- currentSource
Definition at line 229 of file mediaobject.cpp.
◆ setQueue() [1/2]
void Phonon::MediaObject::setQueue | ( | const QList< MediaSource > & | sources | ) |
Set the MediaSources to play when the current media has finished.
This function will overwrite the current queue.
- See also
- clearQueue
- enqueue
Definition at line 270 of file mediaobject.cpp.
◆ setQueue() [2/2]
Set the MediaSources to play when the current media has finished.
This function overwrites the current queue.
- See also
- clearQueue
- enqueue
Definition at line 277 of file mediaobject.cpp.
◆ setTickInterval
|
slot |
Sets the tick interval in milliseconds.
- Parameters
-
newTickInterval the new tick interval in milliseconds.
- See also
- tickInterval
◆ state()
Phonon::State Phonon::MediaObject::state | ( | ) | const |
Get the current state.
- Returns
- The state of the object.
- See also
- State
- stateChanged
Definition at line 69 of file mediaobject.cpp.
◆ stateChanged
|
signal |
Emitted when the state of the MediaObject has changed.
- Parameters
-
newstate The state the Player is in now. oldstate The state the Player was in before.
◆ stop
|
slot |
Requests playback to stop.
If it was stopped before nothing changes.
- Possible states right after this call:
- the state it was in before (e.g. PlayingState)
- StoppedState
- ErrorState
Definition at line 116 of file mediaobject.cpp.
◆ tick
|
signal |
This signal gets emitted every tickInterval milliseconds.
- Parameters
-
time The position of the media file in milliseconds.
- See also
- setTickInterval, tickInterval
◆ tickInterval()
qint32 Phonon::MediaObject::tickInterval | ( | ) | const |
The time interval in milliseconds between two ticks.
The tick interval is the time that elapses between the emission of two tick signals.
- Returns
- the tick interval in milliseconds
◆ totalTime()
qint64 Phonon::MediaObject::totalTime | ( | ) | const |
Get the total time (in milliseconds) of the file currently being played.
- Returns
- The total time in milliseconds.
- Note
- The total time may change throughout playback as more accurate calculations become available, so it is recommended to connect and use the totalTimeChanged signal whenever possible unless best precision is not of importance.
- Warning
- The total time is undefined until the MediaObject entered the PlayingState. A valid total time is always indicated by emission of the totalTimeChanged signal.
- See also
- totalTimeChanged
Definition at line 201 of file mediaobject.cpp.
◆ totalTimeChanged
|
signal |
This signal is emitted as soon as the total time of the media file is known or has changed.
For most non-local media data the total time of the media can only be known after some time. Initially the totalTime function can not return useful information. You have to wait for this signal to know the real total time.
This signal may appear at any given point after a MediaSource was set. Namely in the LoadingState, BufferingState, PlayingState or PausedState.
- Note
- When changing the currentSource there is no signal emission until a reasonable value for the new source has been calculated.
- Parameters
-
newTotalTime The length of the media file in milliseconds.
- See also
- totalTime
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