内容

• 类
• 函数
• 详细描述

BackendCapabilities Namespace

( Phonon::BackendCapabilities )

The BackendCapabilities namespace contains functions to describe the capabilities of the multimedia backend. 更多...

Since:

Qt 4.4

类

class

Notifier

函数

QList<EffectDescription>	availableAudioEffects ()
QList<AudioOutputDevice>	availableAudioOutputDevices ()
QStringList	availableMimeTypes ()
bool	isMimeTypeAvailable (const QString & mimeType )
Notifier *	notifier ()

详细描述

The BackendCapabilities namespace contains functions to describe the capabilities of the multimedia backend.

类

class Notifier

函数文档编制

QList < EffectDescription > BackendCapabilities:: availableAudioEffects ()

Returns descriptions for the audio effects the backend supports.

Returns A list of AudioEffectDescription objects that give a name and description for every supported audio effect.

QList < AudioOutputDevice > BackendCapabilities:: availableAudioOutputDevices ()

Returns the audio output devices the backend supports.

Returns A list of AudioOutputDevice objects that give a name and description for every supported audio output device.

QStringList BackendCapabilities:: availableMimeTypes ()

Returns a list of mime types that the Backend can decode.

另请参阅 isMimeTypeAvailable ().

bool BackendCapabilities:: isMimeTypeAvailable (const QString & mimeType )

Often all you want to know is whether one given MIME type can be decoded by the backend. Use this method in favor of availableMimeTypes () as it can give you a negative answer without having a backend loaded.

Returns true if the given mimeType is supported by the backend; otherwise, returns false.

另请参阅 availableMimeTypes ().

Notifier * BackendCapabilities:: notifier ()

Use this function to get a QObject pointer to connect to the capabilitiesChanged signal.

返回指针指向 QObject .

The capabilitiesChanged signal is emitted if the capabilities have changed. This can happen if the user has requested a backend change.

To connect to this signal do the following:

QObject::connect(BackendCapabilities::notifier(), SIGNAL(capabilitiesChanged()), ...
					

另请参阅 Notifier::capabilitiesChanged ().