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QSound Class Reference

The QSound class provides access to the platform audio facilities. More...

#include <qsound.h>

Inherits QObject.

List of all member functions.

Public Members

Public Slots

Static Public Members


Detailed Description

The QSound class provides access to the platform audio facilities.

Qt provides the most commonly required audio operation in GUI applications: asynchronously playing a sound file. This is most easily accomplished with a single call:

        QSound::play("mysounds/bells.wav");
    

A second API is provided in which a QSound object is created from a sound file and is played later:

        QSound bells("mysounds/bells.wav");

        bells.play();
    

Sounds played using the second model may use more memory but play more immediately than sounds played using the first model, depending on the underlying platform audio facilities.

On Microsoft Windows the underlying multimedia system is used; only WAVE format sound files are supported.

On X11 the Network Audio System is used if available, otherwise all operations work silently. NAS supports WAVE and AU files.

On Macintosh, ironically, we use QT (QuickTime) for sound, this means all QuickTime formats are supported by Qt/Mac.

On Qt/Embedded, a built-in mixing sound server is used, which accesses /dev/dsp directly. Only the WAVE format is supported.

The availability of sound can be tested with QSound::isAvailable().

See also Multimedia Classes.


Member Function Documentation

QSound::QSound ( const QString & filename, QObject * parent = 0, const char * name = 0 )

Constructs a QSound that can quickly play the sound in a file named filename.

This may use more memory than the static play function.

The parent and name arguments (default 0) are passed on to the QObject constructor.

QSound::~QSound ()

Destroys the sound object.

bool QSound::available () [static]

Returns TRUE if sound support is available; otherwise returns FALSE.

QString QSound::fileName () const

Returns the filename associated with the sound.

bool QSound::isAvailable () [static]

Returns TRUE if sound facilities exist on the platform; otherwise returns FALSE. An application may choose either to notify the user if sound is crucial to the application or to operate silently without bothering the user.

If no sound is available, all QSound operations work silently and quickly.

bool QSound::isFinished () const

Returns TRUE if the sound has finished playing; otherwise returns FALSE.

Note: On Windows this will always return TRUE as there is no way to determine when the sound has finished.

int QSound::loops () const

Returns the number of times the sound will play.

int QSound::loopsRemaining () const

Returns the number of times the sound will loop. This value decreases each time the sound loops.

This function is not supported on Windows and will always return the total number of loops.

void QSound::play ( const QString & filename ) [static]

Plays the sound in a file called filename.

Example: sound/sound.cpp.

void QSound::play () [slot]

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Starts the sound playing. The function returns immediately. Depending on the platform audio facilities, other sounds may stop or may be mixed with the new sound.

The sound can be played again at any time, possibly mixing or replacing previous plays of the sound.

void QSound::setLoops ( int l )

Sets the sound to repeat l times when it is played. Passing the value -1 will cause the sound to loop indefinitely.

On Windows, sounds with a loop count different from 1 will always loop indefinitely.

See also loops().

void QSound::stop () [slot]

Stops the sound playing.

See also play().


This file is part of the Qt toolkit. Copyright © 1995-2003 Trolltech. All Rights Reserved.


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Qt 3.2.1