# QAudioDeviceInfo Class Reference
## [[QtMultimedia](index.htm) module]
该QAudioDeviceInfo类提供查询音频设备及其功能的接口。[More...](#details)
### Methods
* `__init__ (self)`
* `__init__ (self, QAudioDeviceInfo other)`
* `QString deviceName (self)`
* `bool isFormatSupported (self, QAudioFormat format)`
* `bool isNull (self)`
* `QAudioFormat nearestFormat (self, QAudioFormat format)`
* `QAudioFormat preferredFormat (self)`
* `list-of-QAudioFormat.Endian supportedByteOrders (self)`
* `list-of-int supportedChannelCounts (self)`
* `list-of-int supportedChannels (self)`
* `QStringList supportedCodecs (self)`
* `list-of-int supportedFrequencies (self)`
* `list-of-int supportedSampleRates (self)`
* `list-of-int supportedSampleSizes (self)`
* `list-of-QAudioFormat.SampleType supportedSampleTypes (self)`
### Static Methods
* `list-of-QAudioDeviceInfo availableDevices (QAudio.Mode mode)`
* `QAudioDeviceInfo defaultInputDevice ()`
* `QAudioDeviceInfo defaultOutputDevice ()`
* * *
## Detailed Description
该QAudioDeviceInfo类提供查询音频设备及其功能的接口。
QAudioDeviceInfo让您查询的音频设备 - 如声卡和USB耳机 - 当前可用的系统上。可用的音频设备都依赖安装在平台或音频插件上。
您也可以查询每个设备所支持的格式。在此上下文中的一种格式是一组由特定的字节顺序，信道编解码器，频率，采样率，和样品的类型。的一种格式是由代表[QAudioFormat](qaudioformat.html)类。
由该设备为每一个参数所支持的值可以与提取[supportedByteOrders](qaudiodeviceinfo.html#supportedByteOrders)（ ）[supportedChannelCounts](qaudiodeviceinfo.html#supportedChannelCounts)（ ）[supportedCodecs](qaudiodeviceinfo.html#supportedCodecs)（ ）[supportedSampleRates](qaudiodeviceinfo.html#supportedSampleRates)（ ）[supportedSampleSizes](qaudiodeviceinfo.html#supportedSampleSizes)（）和[supportedSampleTypes](qaudiodeviceinfo.html#supportedSampleTypes)（ ） 。支持的组合是依赖于平台，安装音频插件和音频设备的能力上。如果你需要一个特定的格式，您可以检查设备是否支持它[isFormatSupported](qaudiodeviceinfo.html#isFormatSupported)（ ） ，或者获取一个支持的格式是尽可能接近的格式[nearestFormat](qaudiodeviceinfo.html#nearestFormat)（ ） 。例如：
```
[QAudioFormat](qaudioformat.html) format;
format.setFrequency(44100);
...
format.setSampleType([QAudioFormat](qaudioformat.html).SignedInt);
QAudioDeviceInfo info(QAudioDeviceInfo.defaultOutputDevice());
if (!info.isFormatSupported(format))
format = info.nearestFormat(format);
```
一个QAudioDeviceInfo所使用的Qt构建类与设备进行通信 - 如[QAudioInput](qaudioinput.html)和[QAudioOutput](qaudiooutput.html)。静态函数[defaultInputDevice](qaudiodeviceinfo.html#defaultInputDevice)（ ）[defaultOutputDevice](qaudiodeviceinfo.html#defaultOutputDevice)（）和[availableDevices](qaudiodeviceinfo.html#availableDevices)（ ）让你得到所有可用设备的列表。器件读取根据mode的值，这是由指定的[QAudio.Mode](qaudio.html#Mode-enum)枚举。该QAudioDeviceInfo返回仅适用于本[QAudio.Mode](qaudio.html#Mode-enum)。
例如：
```
foreach(const QAudioDeviceInfo &deviceInfo, QAudioDeviceInfo.availableDevices([QAudio](qaudio.html).AudioOutput))
qDebug() << "Device name: " << deviceInfo.deviceName();
```
在此代码示例中，我们遍历所有的都能够输出声音，即设备，支持的格式播放音频流。对于发现的每个设备，我们只需打印[deviceName](qaudiodeviceinfo.html#deviceName)（ ） 。
* * *
## Method Documentation
```
QAudioDeviceInfo.__init__ (self)
```
构造一个空[QAudioDeviceInfo](qaudiodeviceinfo.html)对象。
```
QAudioDeviceInfo.__init__ (self, QAudioDeviceInfo other)
```
构造的副本_other_。
```
list-of-QAudioDeviceInfo QAudioDeviceInfo.availableDevices (QAudio.Mode mode)
```
返回支持的音频设备列表_mode_。
```
QAudioDeviceInfo QAudioDeviceInfo.defaultInputDevice ()
```
[
返回默认的输入音频设备的名称。所有的平台和音频插件的实现提供了一个默认的音频设备使用。
](qaudiodeviceinfo.html)
```
QAudioDeviceInfo QAudioDeviceInfo.defaultOutputDevice ()
```
[
返回缺省输出音频设备的名称。所有的平台和音频插件的实现提供了一个默认的音频设备使用。
```
QString QAudioDeviceInfo.deviceName (self)
```
返回音频设备的可读名称。
设备名称具体取决于正在使用的平台/音频插件有所不同。
他们是一个唯一的字符串识别为音频设备。
例如： 。默认情况下，英特尔， U0x46d0x9a4
```
bool QAudioDeviceInfo.isFormatSupported (self, QAudioFormat format)
```
](qaudiodeviceinfo.html)
[返回True如果_settings_通过这种音频设备所支持](qaudiodeviceinfo.html)[QAudioDeviceInfo](qaudiodeviceinfo.html)。
```
bool QAudioDeviceInfo.isNull (self)
```
返回是否该[QAudioDeviceInfo](qaudiodeviceinfo.html)对象持有设备的定义。
```
QAudioFormat QAudioDeviceInfo.nearestFormat (self, QAudioFormat format)
```
[](qaudioformat.html)
[最接近的回报](qaudioformat.html)[QAudioFormat](qaudioformat.html)至_settings_该系统的音频支持。
由平台/音频插件被用来提供这些设置。
他们也都依赖于[QAudio.Mode](qaudio.html#Mode-enum)被使用。
```
QAudioFormat QAudioDeviceInfo.preferredFormat (self)
```
[](qaudioformat.html)
[Returns](qaudioformat.html) [QAudioFormat](qaudioformat.html)的默认设置。
由平台/音频插件被用来提供这些设置。
他们也都依赖于[QAudio.Mode](qaudio.html#Mode-enum)被使用。
一个典型的音响系统可以提供这样的：
* Input settings: 8000Hz mono 8 bit.
* Output settings: 44100Hz stereo 16 bit little endian.
```
list-of-QAudioFormat.Endian QAudioDeviceInfo.supportedByteOrders (self)
```
返回所支持的字节顺序列表。
```
list-of-int QAudioDeviceInfo.supportedChannelCounts (self)
```
返回所支持的通道数的列表。
此功能被引入Qt的4.7 。
```
list-of-int QAudioDeviceInfo.supportedChannels (self)
```
```
QStringList QAudioDeviceInfo.supportedCodecs (self)
```
返回所支持的编解码器的列表。
所有的平台和插件的实现应该对其提供支持：
“音频/ PCM ” - 线性PCM
对于编写插件以支持更多的编解码器是指：
http://www.iana.org/assignments/media-types/audio/
```
list-of-int QAudioDeviceInfo.supportedFrequencies (self)
```
```
list-of-int QAudioDeviceInfo.supportedSampleRates (self)
```
返回所支持的采样率的清单。
此功能被引入Qt的4.7 。
```
list-of-int QAudioDeviceInfo.supportedSampleSizes (self)
```
返回支持的采样大小的列表。
```
list-of-QAudioFormat.SampleType QAudioDeviceInfo.supportedSampleTypes (self)
```
返回支持的采样类型的列表。
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- QTreeWidgetItemIterator Class Reference
- QUdpSocket Class Reference
- QUndoCommand Class Reference
- QUndoGroup Class Reference
- QUndoStack Class Reference
- QUndoView Class Reference
- QUrl Class Reference
- QUrlInfo Class Reference
- QUuid Class Reference
- QValidator Class Reference
- QVariant Class Reference
- QVariantAnimation Class Reference
- QVBoxLayout Class Reference
- QVector2D Class Reference
- QVector3D Class Reference
- QVector4D Class Reference
- QVideoFrame Class Reference
- QVideoSurfaceFormat Class Reference
- QWaitCondition Class Reference
- QWebDatabase Class Reference
- QWebElement Class Reference
- QWebElementCollection Class Reference
- QWebFrame Class Reference
- QWebHistory Class Reference
- QWebHistoryInterface Class Reference
- QWebHistoryItem Class Reference
- QWebHitTestResult Class Reference
- QWebInspector Class Reference
- QWebPage Class Reference
- QWebPluginFactory Class Reference
- QWebSecurityOrigin Class Reference
- QWebSettings Class Reference
- QWebView Class Reference
- QWhatsThis Class Reference
- QWhatsThisClickedEvent Class Reference
- QWheelEvent Class Reference
- QWidget Class Reference
- QWidgetAction Class Reference
- QWidgetItem Class Reference
- QWindowStateChangeEvent Class Reference
- QWizard Class Reference
- QWizardPage Class Reference
- QWorkspace Class Reference
- QWriteLocker Class Reference
- QX11EmbedContainer Class Reference
- QX11EmbedWidget Class Reference
- QX11Info Class Reference
- QXmlAttributes Class Reference
- QXmlContentHandler Class Reference
- QXmlDeclHandler Class Reference
- QXmlDefaultHandler Class Reference
- QXmlDTDHandler Class Reference
- QXmlEntityResolver Class Reference
- QXmlErrorHandler Class Reference
- QXmlFormatter Class Reference
- QXmlInputSource Class Reference
- QXmlItem Class Reference
- QXmlLexicalHandler Class Reference
- QXmlLocator Class Reference
- QXmlName Class Reference
- QXmlNamePool Class Reference
- QXmlNamespaceSupport Class Reference
- QXmlNodeModelIndex Class Reference
- QXmlParseException Class Reference
- QXmlQuery Class Reference
- QXmlReader Class Reference
- QXmlResultItems Class Reference
- QXmlSchema Class Reference
- QXmlSchemaValidator Class Reference
- QXmlSerializer Class Reference
- QXmlSimpleReader Class Reference
- QXmlStreamAttribute Class Reference
- QXmlStreamAttributes Class Reference
- QXmlStreamEntityDeclaration Class Reference
- QXmlStreamEntityResolver Class Reference
- QXmlStreamNamespaceDeclaration Class Reference
- QXmlStreamNotationDeclaration Class Reference
- QXmlStreamReader Class Reference
- QXmlStreamWriter Class Reference