The QAbstractAudioOutput class provides access for QAudioOutput to access the audio device provided by the plugin. More...

#include <qaudioengine.h>

Inheritance diagram for QAbstractAudioOutput:

Signals
void	notify ()
	This signal is emitted when x ms of audio data has been processed the interval set by setNotifyInterval(x). More...

void	stateChanged (QAudio::State)
	This signal is emitted when the device state has changed. More...

Signals inherited from QObject
void	destroyed (QObject *=0)
	This signal is emitted immediately before the object obj is destroyed, and can not be blocked. More...

Public Functions
virtual int	bufferSize () const =0
	Returns the audio buffer size in bytes. More...

virtual int	bytesFree () const =0
	Returns the free space available in bytes in the audio buffer. More...

virtual qint64	elapsedUSecs () const =0
	Returns the milliseconds since start() was called, including time in Idle and suspend states. More...

virtual QAudio::Error	error () const =0
	Returns the error state. More...

virtual QAudioFormat	format () const =0
	Returns the QAudioFormat being used. More...

virtual int	notifyInterval () const =0
	Returns the notify interval in milliseconds. More...

virtual int	periodSize () const =0
	Returns the period size in bytes. More...

virtual qint64	processedUSecs () const =0
	Returns the amount of audio data processed since start() was called in milliseconds. More...

virtual void	reset ()=0
	Drops all audio data in the buffers, resets buffers to zero. More...

virtual void	resume ()=0
	Resumes processing audio data after a suspend() More...

virtual void	setBufferSize (int value)=0
	Sets the audio buffer size to value in bytes. More...

virtual void	setNotifyInterval (int milliSeconds)=0
	Sets the interval for notify() signal to be emitted. More...

virtual QIODevice *	start (QIODevice *device)=0
	Uses the device as the QIODevice to transfer data. More...

virtual QAudio::State	state () const =0
	Returns the state of audio processing. More...

virtual void	stop ()=0
	Stops the audio output. More...

virtual void	suspend ()=0
	Stops processing audio data, preserving buffered audio data. More...

Public Functions inherited from QObject
bool	blockSignals (bool b)
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). More...

const QObjectList &	children () const
	Returns a list of child objects. More...

bool	connect (const QObject sender, const char signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const

bool	disconnect (const char signal=0, const QObject receiver=0, const char *member=0)

bool	disconnect (const QObject receiver, const char member=0)

void	dumpObjectInfo ()
	Dumps information about signal connections, etc. More...

void	dumpObjectTree ()
	Dumps a tree of children to the debug output. More...

QList< QByteArray >	dynamicPropertyNames () const
	Returns the names of all properties that were dynamically added to the object using setProperty(). More...

virtual bool	event (QEvent *)
	This virtual function receives events to an object and should return true if the event e was recognized and processed. More...

virtual bool	eventFilter (QObject , QEvent )
	Filters events if this object has been installed as an event filter for the watched object. More...

template<typename T >
T	findChild (const QString &aName=QString()) const
	Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. More...

template<typename T >
QList< T >	findChildren (const QString &aName=QString()) const
	Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. More...

template<typename T >
QList< T >	findChildren (const QRegExp &re) const

bool	inherits (const char *classname) const
	Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false. More...

void	installEventFilter (QObject *)
	Installs an event filter filterObj on this object. More...

bool	isWidgetType () const
	Returns true if the object is a widget; otherwise returns false. More...

void	killTimer (int id)
	Kills the timer with timer identifier, id. More...

virtual const QMetaObject *	metaObject () const
	Returns a pointer to the meta-object of this object. More...

void	moveToThread (QThread *thread)
	Changes the thread affinity for this object and its children. More...

QString	objectName () const

QObject *	parent () const
	Returns a pointer to the parent object. More...

QVariant	property (const char *name) const
	Returns the value of the object's name property. More...

Q_INVOKABLE	QObject (QObject *parent=0)
	Constructs an object with parent object parent. More...

void	removeEventFilter (QObject *)
	Removes an event filter object obj from this object. More...

void	setObjectName (const QString &name)

void	setParent (QObject *)
	Makes the object a child of parent. More...

bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value. More...

void	setUserData (uint id, QObjectUserData *data)

bool	signalsBlocked () const
	Returns true if signals are blocked; otherwise returns false. More...

int	startTimer (int interval)
	Starts a timer and returns a timer identifier, or returns zero if it could not start a timer. More...

QThread *	thread () const
	Returns the thread in which the object lives. More...

QObjectUserData *	userData (uint id) const

virtual	~QObject ()
	Destroys the object, deleting all its child objects. More...

Additional Inherited Members
Public Slots inherited from QObject
void	deleteLater ()
	Schedules this object for deletion. More...

Static Public Functions inherited from QObject
static bool	connect (const QObject sender, const char signal, const QObject receiver, const char member, Qt::ConnectionType=Qt::AutoConnection)
	Creates a connection of the given type from the signal in the sender object to the method in the receiver object. More...

static bool	connect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)

static bool	disconnect (const QObject sender, const char signal, const QObject receiver, const char member)
	Disconnects signal in object sender from method in object receiver. More...

static bool	disconnect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &member)

static uint	registerUserData ()

static QString	tr (const char sourceText, const char comment=0, int n=-1)

static QString	trUtf8 (const char sourceText, const char comment=0, int n=-1)

Static Public Variables inherited from QObject
static const QMetaObject	staticMetaObject
	This variable stores the meta-object for the class. More...

Protected Functions inherited from QObject
virtual void	childEvent (QChildEvent *)
	This event handler can be reimplemented in a subclass to receive child events. More...

virtual void	connectNotify (const char *signal)
	This virtual function is called when something has been connected to signal in this object. More...

virtual void	customEvent (QEvent *)
	This event handler can be reimplemented in a subclass to receive custom events. More...

virtual void	disconnectNotify (const char *signal)
	This virtual function is called when something has been disconnected from signal in this object. More...

	QObject (QObjectPrivate &dd, QObject *parent=0)

int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal. More...

QObject *	sender () const
	Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns 0. More...

int	senderSignalIndex () const

virtual void	timerEvent (QTimerEvent *)
	This event handler can be reimplemented in a subclass to receive timer events for the object. More...

Protected Variables inherited from QObject
QScopedPointer< QObjectData >	d_ptr

Static Protected Variables inherited from QObject
static const QMetaObject	staticQtMetaObject

Related Functions inherited from QObject
T	qFindChildqFindChildren (const QObject *obj, const QString &name)()

QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()

QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QRegExp &regExp)()

T *	qobject_cast (QObject *object)

	QObjectList

void *	qt_find_obj_child (QObject parent, const char type, const QString &name)
	Returns a pointer to the object named name that inherits type and with a given parent. More...

Detailed Description

The QAbstractAudioOutput class provides access for QAudioOutput to access the audio device provided by the plugin.

Warning: This function is not part of the public interface.

QAbstractAudioOutput implements audio functionality for QAudioOutput, i.e., QAudioOutput routes function calls to QAbstractAudioOutput. For a description of the functionality that is implemented, see the QAudioOutput class and function descriptions.

See also: QAudioOutput

Definition at line 73 of file qaudioengine.h.

Functions

◆ bufferSize()

int QAbstractAudioOutput::bufferSize ( ) const

pure virtual

Returns the audio buffer size in bytes.

Implemented in QAudioOutputPrivate, QNullOutputDevice, QAudioOutputPrivate, and QAudioOutputPrivate.

Referenced by QAudioOutput::bufferSize().

◆ bytesFree()

int QAbstractAudioOutput::bytesFree ( ) const

pure virtual

Returns the free space available in bytes in the audio buffer.

Implemented in QAudioOutputPrivate, QNullOutputDevice, QAudioOutputPrivate, and QAudioOutputPrivate.

Referenced by QAudioOutput::bytesFree().

◆ elapsedUSecs()

qint64 QAbstractAudioOutput::elapsedUSecs ( ) const

pure virtual

Returns the milliseconds since start() was called, including time in Idle and suspend states.

Implemented in QAudioOutputPrivate, QNullOutputDevice, QAudioOutputPrivate, and QAudioOutputPrivate.

Referenced by QAudioOutput::elapsedUSecs().

◆ error()

QAudio::Error QAbstractAudioOutput::error ( ) const

pure virtual

Returns the error state.

Implemented in QAudioOutputPrivate, QNullOutputDevice, QAudioOutputPrivate, and QAudioOutputPrivate.

Referenced by QAudioOutput::error().

◆ format()

QAudioFormat QAbstractAudioOutput::format ( ) const

pure virtual

Returns the QAudioFormat being used.

Implemented in QNullOutputDevice, QAudioOutputPrivate, QAudioOutputPrivate, and QAudioOutputPrivate.

Referenced by QAudioOutput::format().

◆ notify

QAbstractAudioOutput::notify ( )

signal

This signal is emitted when x ms of audio data has been processed the interval set by setNotifyInterval(x).

Referenced by QAudioOutputPrivate::deviceReady(), and QAudioOutputPrivate::freeBlocks().

◆ notifyInterval()

int QAbstractAudioOutput::notifyInterval ( ) const

pure virtual

Returns the notify interval in milliseconds.

Implemented in QAudioOutputPrivate, QNullOutputDevice, QAudioOutputPrivate, and QAudioOutputPrivate.

Referenced by QAudioOutput::notifyInterval().

◆ periodSize()

int QAbstractAudioOutput::periodSize ( ) const

pure virtual

Returns the period size in bytes.

Implemented in QAudioOutputPrivate, QNullOutputDevice, QAudioOutputPrivate, and QAudioOutputPrivate.

Referenced by QAudioOutput::periodSize().

◆ processedUSecs()

qint64 QAbstractAudioOutput::processedUSecs ( ) const

pure virtual

Returns the amount of audio data processed since start() was called in milliseconds.

Implemented in QAudioOutputPrivate, QNullOutputDevice, QAudioOutputPrivate, and QAudioOutputPrivate.

Referenced by QAudioOutput::processedUSecs().

◆ reset()

void QAbstractAudioOutput::reset ( )

pure virtual

Drops all audio data in the buffers, resets buffers to zero.

Implemented in QAudioOutputPrivate, QNullOutputDevice, QAudioOutputPrivate, and QAudioOutputPrivate.

Referenced by QAudioOutput::reset().

◆ resume()

void QAbstractAudioOutput::resume ( )

pure virtual

Resumes processing audio data after a suspend()

Implemented in QAudioOutputPrivate, QNullOutputDevice, QAudioOutputPrivate, and QAudioOutputPrivate.

Referenced by QAudioOutput::resume().

◆ setBufferSize()

void QAbstractAudioOutput::setBufferSize ( int value )

pure virtual

Sets the audio buffer size to value in bytes.

Implemented in QAudioOutputPrivate, QNullOutputDevice, QAudioOutputPrivate, and QAudioOutputPrivate.

Referenced by QAudioOutput::setBufferSize().

◆ setNotifyInterval()

void QAbstractAudioOutput::setNotifyInterval ( int ms )

pure virtual

Sets the interval for notify() signal to be emitted.

This is based on the ms of audio data processed not on actual real-time. The resolution of the timer is platform specific.

Implemented in QAudioOutputPrivate, QNullOutputDevice, QAudioOutputPrivate, and QAudioOutputPrivate.

Referenced by QAudioOutput::setNotifyInterval().

◆ start()

QIODevice * QAbstractAudioOutput::start ( QIODevice * device )

pure virtual

Uses the device as the QIODevice to transfer data.

If device is null then the class creates an internal QIODevice. Returns a pointer to the QIODevice being used to handle the data transfer. This QIODevice can be used to write() audio data directly. Passing a QIODevice allows the data to be transferred without any extra code.

Implemented in QAudioOutputPrivate, QNullOutputDevice, QAudioOutputPrivate, and QAudioOutputPrivate.

Referenced by QAudioOutput::start().