Phonon::Experimental::AudioDataOutput Class Reference

#include <audiodataoutput.h>

Inheritance diagram for Phonon::Experimental::AudioDataOutput:

Public Types
enum	Channel {   LeftChannel , RightChannel , CenterChannel , LeftSurroundChannel ,   RightSurroundChannel , SubwooferChannel }
enum	Format { IntegerFormat = 1 , FloatFormat = 2 }

Properties
int	dataSize
Format	format
Properties inherited from QObject
	objectName

Signals
void	dataReady (const QMap< Phonon::Experimental::AudioDataOutput::Channel, QVector< float > > &data)
void	dataReady (const QMap< Phonon::Experimental::AudioDataOutput::Channel, QVector< qint16 > > &data)
void	endOfMedia (int remainingSamples)

Public Slots
void	setDataSize (int size)
void	setFormat (Format format)

Public Member Functions
int	dataSize () const
Format	format () const
int	sampleRate () 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
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
Protected Member Functions inherited from Phonon::AbstractAudioOutput
	AbstractAudioOutput (AbstractAudioOutputPrivate &dd, QObject *parent)
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

This class gives you the audio data (for visualizations).

This class implements a special AbstractAudioOutput that gives your application the audio data. Don't expect realtime performance. But the latencies should be low enough to use the audio data for visualizations. You can also use the audio data for further processing (e.g. encoding and saving to a file).

The class supports different data formats. One of the most common formats is to read vectors of integers (which will only use 16 Bit), but you can also request floats which some backends use internally.

Author

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

Definition at line 59 of file experimental/audiodataoutput.h.

Member Enumeration Documentation

Channel

enum Phonon::Experimental::AudioDataOutput::Channel

Specifies the channel the audio data belongs to.

Definition at line 71 of file experimental/audiodataoutput.h.

Format

enum Phonon::Experimental::AudioDataOutput::Format

Used for telling the object whether you want 16 bit Integers or 32 bit floats.

See also

requestFormat

Enumerator
IntegerFormat	Requests 16 bit signed integers. See also dataReady(const QVector<qint16> &)
FloatFormat	Requests 32 bit floating point: signed, zero centered, and normalized to the unit value (-1.0 to 1.0). See also dataReady(const QVector<float> &)

Definition at line 87 of file experimental/audiodataoutput.h.

Property Documentation

dataSize

int Phonon::Experimental::AudioDataOutput::dataSize

readwrite

Definition at line 65 of file experimental/audiodataoutput.h.

format

Format Phonon::Experimental::AudioDataOutput::format

readwrite

Definition at line 64 of file experimental/audiodataoutput.h.

Member Function Documentation

dataReady [1/2]

void Phonon::Experimental::AudioDataOutput::dataReady ( const QMap< Phonon::Experimental::AudioDataOutput::Channel, QVector< float > > & data )

signal

Emitted whenever another dataSize number of samples are ready and format is set to FloatFormat.

If format is set to IntegerFormat the signal is not emitted at all.

Parameters

data	A mapping of Channel to a vector holding the audio data.

dataReady [2/2]

void Phonon::Experimental::AudioDataOutput::dataReady ( const QMap< Phonon::Experimental::AudioDataOutput::Channel, QVector< qint16 > > & data )

signal

Emitted whenever another dataSize number of samples are ready and format is set to IntegerFormat.

If format is set to FloatFormat the signal is not emitted at all.

Parameters

data	A mapping of Channel to a vector holding the audio data.

dataSize()

int Phonon::Experimental::AudioDataOutput::dataSize

(

)

const

Returns the currently used number of samples passed through the signal.

See also

setDataSize

endOfMedia

void Phonon::Experimental::AudioDataOutput::endOfMedia ( int remainingSamples )

signal

This signal is emitted before the last dataReady signal of a media is emitted.

If, for example, the playback of a media file has finished and the last audio data of that file is going to be passed with the next dataReady signal, and only the 28 first samples of the data vector are from that media file endOfMedia will be emitted right before dataReady with remainingSamples = 28.

Parameters

remainingSamples

The number of samples in the next dataReady vector that belong to the media that was playing to this point.

format()

Format Phonon::Experimental::AudioDataOutput::format

(

)

const

Returns the currently used format.

See also

setFormat

sampleRate()

int Phonon::Experimental::AudioDataOutput::sampleRate

(

)

const

Returns the sample rate in Hz.

Common sample rates are 44100 Hz and 48000 Hz. AudioDataOutput will not do any sample rate conversion for you. If you need to convert the sample rate you might want to take a look at libsamplerate. For visualizations it is often enough to do simple interpolation or even drop/duplicate samples.

Returns

The sample rate as reported by the backend. If the backend is unavailable -1 is returned.

setDataSize

void Phonon::Experimental::AudioDataOutput::setDataSize ( int size )

slot

Sets the number of samples to be passed in one signal emission.

Defaults to 512 samples per emitted signal.

Parameters

size	the number of samples

setFormat

void Phonon::Experimental::AudioDataOutput::setFormat ( Format format )

slot

Requests the dataformat you'd like to receive.

Only one of the signals of this class will be emitted when new data is ready.

The default format is IntegerFormat.

See also

format()

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

• experimental/audiodataoutput.h