Phonon::AbstractMediaStream Class Reference

#include <phonon/AbstractMediaStream>

Inheritance diagram for Phonon::AbstractMediaStream:

Protected Member Functions
	AbstractMediaStream (AbstractMediaStreamPrivate &dd, QObject *parent)
	AbstractMediaStream (QObject *parent=nullptr)
void	endOfData ()
virtual Q_INVOKABLE void	enoughData ()
void	error (Phonon::ErrorType errorType, const QString &errorString)
virtual Q_INVOKABLE void	needData ()=0
virtual Q_INVOKABLE void	reset ()=0
virtual Q_INVOKABLE void	seekStream (qint64 offset)
void	setStreamSeekable (bool)
void	setStreamSize (qint64)
bool	streamSeekable () const
qint64	streamSize () const
void	writeData (const QByteArray &data)
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)

Protected Attributes
QScopedPointer< AbstractMediaStreamPrivate >	d_ptr

Additional Inherited Members
Properties inherited from QObject
	objectName
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
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)
Public Attributes inherited from QObject
typedef	QObjectList

Detailed Description

Base class for custom media data streams.

Implement this class to provide a custom data stream to the backend. The class supports both, the push and the pull model.

Push:

PushStream::PushStream(QObject *parent)
  : AbstractMediaStream(parent), m_timer(new QTimer(this))
{
  setStreamSize(getMediaStreamSize());
 
  connect(m_timer, SIGNAL(timeout()), SLOT(moreData()));
  m_timer->setInterval(0);
}
 
void PushStream::moreData()
{
  const QByteArray data = getMediaData();
  if (data.isEmpty()) {
    endOfData();
  } else {
    writeData(data);
  }
}
 
void PushStream::needData()
{
  m_timer->start();
  moreData();
}
 
void PushStream::enoughData()
{
  m_timer->stop();
}

Pull:

PullStream::PullStream(QObject *parent)
  : AbstractMediaStream(parent)
{
  setStreamSize(getMediaStreamSize());
}
 
void PullStream::needData()
{
  const QByteArray data = getMediaData();
  if (data.isEmpty()) {
    endOfData();
  } else {
    writeData(data);
  }
}

Author

Matthias Kretz kretz.nosp@m.@kde.nosp@m..org

Definition at line 101 of file abstractmediastream.h.

Constructor & Destructor Documentation

~AbstractMediaStream()

Phonon::AbstractMediaStream::~AbstractMediaStream ( )

override

Definition at line 49 of file abstractmediastream.cpp.

AbstractMediaStream() [1/2]

Phonon::AbstractMediaStream::AbstractMediaStream ( QObject * parent = nullptr )

explicitprotected

Constructs an AbstractMediaStream object with a parent.

Definition at line 35 of file abstractmediastream.cpp.

AbstractMediaStream() [2/2]

Phonon::AbstractMediaStream::AbstractMediaStream ( AbstractMediaStreamPrivate & dd, QObject * parent )

protected

Definition at line 42 of file abstractmediastream.cpp.

Member Function Documentation

endOfData()

void Phonon::AbstractMediaStream::endOfData ( )

protected

Tells the backend that the media data stream is at its end.

Warning

Don't call this function before the first needData() is emitted.

Definition at line 103 of file abstractmediastream.cpp.

enoughData()

void Phonon::AbstractMediaStream::enoughData ( )

protectedvirtual

Reimplement this function to be notified when the backend has enough data and your stream object may take a break.

This method is important for pushing data to the backend in order to not fill the backend buffer unnecessarily.

Definition at line 126 of file abstractmediastream.cpp.

error()

void Phonon::AbstractMediaStream::error ( Phonon::ErrorType errorType, const QString & errorString )

protected

If an I/O error occurs you should call this function to make MediaObject go into ErrorState.

See also

MediaObject::errorType()

MediaObject::errorString()

Definition at line 115 of file abstractmediastream.cpp.

needData()

virtual Q_INVOKABLE void Phonon::AbstractMediaStream::needData ( )

protectedpure virtual

Reimplement this function to be notified when the backend needs data.

When this function is called you should try to call writeData or endOfData before returning.

reset()

virtual Q_INVOKABLE void Phonon::AbstractMediaStream::reset ( )

protectedpure virtual

Reimplement this function to reset the stream.

Subsequent calls to writeData should start from the first position of the data unless a seek is requested.

The function is necessary for the case where a non-seekable MediaStream is played more than once. For a seekable stream the implementation can simply call

seekStream(0);

.

seekStream()

void Phonon::AbstractMediaStream::seekStream ( qint64 offset )

protectedvirtual

Reimplement this function if your stream is seekable.

When this function is called the next call to writeData has to be at the requested offset.

Warning

Do not call the parent implementation.

Definition at line 130 of file abstractmediastream.cpp.

setStreamSeekable()

void Phonon::AbstractMediaStream::setStreamSeekable ( bool s )

protected

Sets whether your data stream is seekable.

Defaults to false.

If you set this to true you have to implement the seekStream function.

Definition at line 76 of file abstractmediastream.cpp.

setStreamSize()

void Phonon::AbstractMediaStream::setStreamSize ( qint64 newSize )

protected

Sets the size of the stream in number of bytes.

A negative value means that the length of the stream cannot be known.

Defaults to 0.

This function has to be called. A backend will not call needData() until the stream size is set.

Definition at line 58 of file abstractmediastream.cpp.

streamSeekable()

bool Phonon::AbstractMediaStream::streamSeekable ( ) const

protected

Returns whether your data stream is set as seekable.

Defaults to false.

Definition at line 71 of file abstractmediastream.cpp.

streamSize()

qint64 Phonon::AbstractMediaStream::streamSize ( ) const

protected

Returns the stream size that was set with setStreamSize.

A negative value means that the length of the stream cannot be known.

Defaults to 0.

Definition at line 53 of file abstractmediastream.cpp.

writeData()

void Phonon::AbstractMediaStream::writeData ( const QByteArray & data )

protected

Sends the media data to the backend for decoding.

Warning

Don't call this function before the first needData() is emitted.

Definition at line 89 of file abstractmediastream.cpp.

Member Data Documentation

d_ptr

QScopedPointer<AbstractMediaStreamPrivate> Phonon::AbstractMediaStream::d_ptr

protected

Definition at line 215 of file abstractmediastream.h.

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The documentation for this class was generated from the following files:

• abstractmediastream.h
• abstractmediastream.cpp