# QVideoSurfaceFormat Class Reference
## [[QtMultimedia](index.htm) module]
该QVideoSurfaceFormat类指定视频演示表面的流格式。[More...](#details)
### Types
* `enum Direction { TopToBottom, BottomToTop }`
* `enum YCbCrColorSpace { YCbCr_Undefined, YCbCr_BT601, YCbCr_BT709, YCbCr_xvYCC601, YCbCr_xvYCC709, YCbCr_JPEG }`
### Methods
* `__init__ (self)`
* `__init__ (self, QSize size, QVideoFrame.PixelFormat format, QAbstractVideoBuffer.HandleType type = QAbstractVideoBuffer.NoHandle)`
* `__init__ (self, QVideoSurfaceFormat format)`
* `int frameHeight (self)`
* `float frameRate (self)`
* `QSize frameSize (self)`
* `int frameWidth (self)`
* `QAbstractVideoBuffer.HandleType handleType (self)`
* `bool isValid (self)`
* `QSize pixelAspectRatio (self)`
* `QVideoFrame.PixelFormat pixelFormat (self)`
* `QVariant property (self, str name)`
* `list-of-QByteArray propertyNames (self)`
* `Direction scanLineDirection (self)`
* `setFrameRate (self, float rate)`
* `setFrameSize (self, QSize size)`
* `setFrameSize (self, int width, int height)`
* `setPixelAspectRatio (self, QSize ratio)`
* `setPixelAspectRatio (self, int width, int height)`
* `setProperty (self, str name, QVariant value)`
* `setScanLineDirection (self, Direction direction)`
* `setViewport (self, QRect viewport)`
* `setYCbCrColorSpace (self, YCbCrColorSpace colorSpace)`
* `QSize sizeHint (self)`
* `QRect viewport (self)`
* `YCbCrColorSpace yCbCrColorSpace (self)`
### Special Methods
* `bool __eq__ (self, QVideoSurfaceFormat format)`
* `bool __ne__ (self, QVideoSurfaceFormat format)`
* * *
## Detailed Description
该QVideoSurfaceFormat类指定视频演示表面的流格式。
视频表面呈现的视频帧流。表面的形式描述了帧的类型，并确定应如何呈现。
需要设置一个视频表面上的视频信息流的核心属性是由给定的像素格式[pixelFormat](qvideosurfaceformat.html#pixelFormat)（ ） ，并给出了框架尺寸[frameSize](qvideosurfaceformat.html#frameSize)（ ） 。
如果表面是用一帧的把手表面的格式呈现的帧也将包括由给定的一个句柄类型[handleType](qvideosurfaceformat.html#handleType)（）函数。
实际上是显示在视频面一帧的区域是通过在给定[viewport](qvideosurfaceformat.html#viewport)（ ） 。甲流可具有视口比一帧的整个区域减去，以允许视频比视频帧的最接近的最佳尺寸。例如一帧的宽度可以延伸，使得每个扫描行的开始是8字节对齐的。
其他常见的属性是[pixelAspectRatio](qvideosurfaceformat.html#pixelAspectRatio)（ ）[scanLineDirection](qvideosurfaceformat.html#scanLineDirection)（）和[frameRate](qvideosurfaceformat.html#frameRate)（ ） 。另外一个数据流可以具有所列的dynamicPropertyNames一些额外类型的特定属性（）函数，并且可以使用被访问的[property](qvideosurfaceformat.html#property)（）和[setProperty](qvideosurfaceformat.html#setProperty)（）函数。
* * *
## Type Documentation
```
QVideoSurfaceFormat.Direction
```
列举的视频扫描线的布局方向。
| Constant | Value | Description |
| --- | --- | --- |
| `QVideoSurfaceFormat.TopToBottom` | `0` | 扫描线被布置在框架的顶部向底部。 |
| `QVideoSurfaceFormat.BottomToTop` | `1` | 扫描线被布置在框架的底部到顶部。 |
```
QVideoSurfaceFormat.YCbCrColorSpace
```
列举了视频帧的Y'CbCr的色彩空间。
| Constant | Value | Description |
| --- | --- | --- |
| `QVideoSurfaceFormat.YCbCr_Undefined` | `0` | 未指定的色彩空间。 |
| `QVideoSurfaceFormat.YCbCr_BT601` | `1` | 由ITU -R BT.601建议与Y值的范围从16到235 ，和CB / CR范围从16到240定义的Y'CbCr的色彩空间。用于标准清晰度视频。 |
| `QVideoSurfaceFormat.YCbCr_BT709` | `2` | 由ITU- R BT.709具有相同的值定义的Y'CbCr的色彩空间范围内YCbCr_BT601 。用于高清晰度电视。 |
| `QVideoSurfaceFormat.YCbCr_xvYCC601` | `3` | 同的数值范围的BT.601颜色空间扩大到0 〜255。它是落后的。兼容与BT.601和使用外BT.601范围值来表示更广泛的色彩范围。 |
| `QVideoSurfaceFormat.YCbCr_xvYCC709` | `4` | 同的数值范围的BT.709颜色空间扩大到0 〜255。 |
| `QVideoSurfaceFormat.YCbCr_JPEG` | `5` | 在JPEG文件中使用的全范围Y'CbCr的色彩空间。 |
* * *
## Method Documentation
```
QVideoSurfaceFormat.__init__ (self)
```
构造一个空的视频流格式。
```
QVideoSurfaceFormat.__init__ (self, QSize size, QVideoFrame.PixelFormat format, QAbstractVideoBuffer.HandleType type = QAbstractVideoBuffer.NoHandle)
```
Contructs流的描述，它接收的数据流_type_缓冲区与给定的框架_size_和像素_format_。
```
QVideoSurfaceFormat.__init__ (self, QVideoSurfaceFormat format)
```
构造的副本_other_。
```
int QVideoSurfaceFormat.frameHeight (self)
```
返回帧中的视频流的高度。
```
float QVideoSurfaceFormat.frameRate (self)
```
返回以每秒帧数的视频流的帧速率。
**See also** [setFrameRate](qvideosurfaceformat.html#setFrameRate)（ ） 。
```
QSize QVideoSurfaceFormat.frameSize (self)
```
[
返回视频流中的帧的大小。
](qsize.html)
[**See also**](qsize.html) [setFrameSize](qvideosurfaceformat.html#setFrameSize)（ ）[frameWidth](qvideosurfaceformat.html#frameWidth)（）和[frameHeight](qvideosurfaceformat.html#frameHeight)（ ） 。
```
int QVideoSurfaceFormat.frameWidth (self)
```
返回视频流中帧的宽度。
**See also** [frameSize](qvideosurfaceformat.html#frameSize)（）和[frameHeight](qvideosurfaceformat.html#frameHeight)（ ） 。
```
QAbstractVideoBuffer.HandleType QVideoSurfaceFormat.handleType (self)
```
[
返回表面采用提呈本帧数据处理的类型。
](qabstractvideobuffer.html#HandleType-enum)
[如果句柄类型是](qabstractvideobuffer.html#HandleType-enum)[QAbstractVideoBuffer.NoHandle](qabstractvideobuffer.html#HandleType-enum)缓冲区与任何句柄类型是有效的，只要它们能[mapped](qabstractvideobuffer.html#map)与[QAbstractVideoBuffer.ReadOnly](qabstractvideobuffer.html#MapMode-enum)标志。如果handleType （）不是[QAbstractVideoBuffer.NoHandle](qabstractvideobuffer.html#HandleType-enum)然后缓冲区的句柄类型是相同的，该表面的格式。
```
bool QVideoSurfaceFormat.isValid (self)
```
如果识别的视频格式，表面具有有效像素格式和帧大小。
返回True如果该格式是有效的，否则为False。
```
QSize QVideoSurfaceFormat.pixelAspectRatio (self)
```
[
返回视频流的像素宽高比。
](qsize.html)
[**See also**](qsize.html) [setPixelAspectRatio](qvideosurfaceformat.html#setPixelAspectRatio)（ ） 。
```
QVideoFrame.PixelFormat QVideoSurfaceFormat.pixelFormat (self)
```
[
返回视频流中的帧的像素格式。
```
QVariant QVideoSurfaceFormat.property (self, str name)
```
传回的视频格式的值_name_属性。
](qvideoframe.html#PixelFormat-enum)
[**See also**](qvideoframe.html#PixelFormat-enum) [setProperty](qvideosurfaceformat.html#setProperty)（ ） 。
```
list-of-QByteArray QVideoSurfaceFormat.propertyNames (self)
```
传回的视频格式动态属性名称的列表。
```
Direction QVideoSurfaceFormat.scanLineDirection (self)
```
[
返回扫描线的方向。
](qvideosurfaceformat.html#Direction-enum)
[**See also**](qvideosurfaceformat.html#Direction-enum) [setScanLineDirection](qvideosurfaceformat.html#setScanLineDirection)（ ） 。
```
QVideoSurfaceFormat.setFrameRate (self, float rate)
```
设置框架_rate_在帧每秒的视频流。
**See also** [frameRate](qvideosurfaceformat.html#frameRate)（ ） 。
```
QVideoSurfaceFormat.setFrameSize (self, QSize size)
```
设置帧的大小在视频流中，以_size_。
这将重置[viewport](qvideosurfaceformat.html#viewport)（）来填满整个画面。
**See also** [frameSize](qvideosurfaceformat.html#frameSize)（ ） 。
```
QVideoSurfaceFormat.setFrameSize (self, int width, int height)
```
这是一个重载函数。
设置_width_和_height_的帧中的视频流。
这将重置[viewport](qvideosurfaceformat.html#viewport)（）来填满整个画面。
```
QVideoSurfaceFormat.setPixelAspectRatio (self, QSize ratio)
```
设置一个视频流的像素宽高比_ratio_。
**See also** [pixelAspectRatio](qvideosurfaceformat.html#pixelAspectRatio)（ ） 。
```
QVideoSurfaceFormat.setPixelAspectRatio (self, int width, int height)
```
这是一个重载函数。
设置_horizontal_和_vertical_的视频流的像素宽高比的元素。
```
QVideoSurfaceFormat.setProperty (self, str name, QVariant value)
```
设置视频格式的_name_属性为_value_。
**See also** [property](qvideosurfaceformat.html#property)（ ） 。
```
QVideoSurfaceFormat.setScanLineDirection (self, Direction direction)
```
设置_direction_的扫描线。
**See also** [scanLineDirection](qvideosurfaceformat.html#scanLineDirection)（ ） 。
```
QVideoSurfaceFormat.setViewport (self, QRect viewport)
```
设置一个视频流的视口_viewport_。
**See also** [viewport](qvideosurfaceformat.html#viewport)（ ） 。
```
QVideoSurfaceFormat.setYCbCrColorSpace (self, YCbCrColorSpace colorSpace)
```
设置Y'CbCr的颜色_space_的视频流。它仅用于与原始YUV帧类型。
**See also** [yCbCrColorSpace](qvideosurfaceformat.html#yCbCrColorSpace)（ ） 。
```
QSize QVideoSurfaceFormat.sizeHint (self)
```
[
返回视频流像素的建议的大小。
这是根据该像素纵横比缩放的视口的大小。
](qsize.html)
```
QRect QVideoSurfaceFormat.viewport (self)
```
[
返回视频流的视口。
视口是实际显示一个视频帧的区域。
默认情况下，视口复盖整个帧。
](qrect.html)
[**See also**](qrect.html) [setViewport](qvideosurfaceformat.html#setViewport)（ ） 。
```
YCbCrColorSpace QVideoSurfaceFormat.yCbCrColorSpace (self)
```
[
返回视频流的Y'CbCr的色彩空间。
](qvideosurfaceformat.html#YCbCrColorSpace-enum)
[**See also**](qvideosurfaceformat.html#YCbCrColorSpace-enum) [setYCbCrColorSpace](qvideosurfaceformat.html#setYCbCrColorSpace)（ ） 。
```
bool QVideoSurfaceFormat.__eq__ (self, QVideoSurfaceFormat format)
```
```
bool QVideoSurfaceFormat.__ne__ (self, QVideoSurfaceFormat format)
```
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- QSplitterHandle Class Reference
- QSql Class Reference
- QSqlDatabase Class Reference
- QSqlDriver Class Reference
- QSqlDriverCreatorBase Class Reference
- QSqlError Class Reference
- QSqlField Class Reference
- QSqlIndex Class Reference
- QSqlQuery Class Reference
- QSqlQueryModel Class Reference
- QSqlRecord Class Reference
- QSqlRelation Class Reference
- QSqlRelationalDelegate Class Reference
- QSqlRelationalTableModel Class Reference
- QSqlResult Class Reference
- QSqlTableModel Class Reference
- Qt4.7文档翻译：Qt样式单参考,Qt Style Sheets Reference
- QSsl Class Reference
- QSslCertificate Class Reference
- QSslCipher Class Reference
- QSslConfiguration Class Reference
- QSslError Class Reference
- QSslKey Class Reference
- QSslSocket Class Reference
- QStackedLayout Class Reference
- QStackedWidget Class Reference
- QStandardItem Class Reference
- QStandardItemModel Class Reference
- QState Class Reference
- QStateMachine Class Reference
- QStaticText Class Reference
- QStatusBar Class Reference
- QStatusTipEvent Class Reference
- QString Class Reference
- QStringList Class Reference
- QStringListModel Class Reference
- QStringMatcher Class Reference
- QStringRef Class Reference
- QStyle Class Reference
- QStyledItemDelegate Class Reference
- QStyleFactory Class Reference
- QStyleHintReturn Class Reference
- QStyleHintReturnMask Class Reference
- QStyleHintReturnVariant Class Reference
- QStyleOption Class Reference
- QStyleOptionButton Class Reference
- QStyleOptionComboBox Class Reference
- QStyleOptionComplex Class Reference
- QStyleOptionDockWidget Class Reference
- QStyleOptionDockWidgetV2 Class Reference
- QStyleOptionFocusRect Class Reference
- QStyleOptionFrame Class Reference
- QStyleOptionFrameV2 Class Reference
- QStyleOptionFrameV3 Class Reference
- QStyleOptionGraphicsItem Class Reference
- QStyleOptionGroupBox Class Reference
- QStyleOptionHeader Class Reference
- QStyleOptionMenuItem Class Reference
- QStyleOptionProgressBar Class Reference
- QStyleOptionProgressBarV2 Class Reference
- QStyleOptionRubberBand Class Reference
- QStyleOptionSizeGrip Class Reference
- QStyleOptionSlider Class Reference
- QStyleOptionSpinBox Class Reference
- QStyleOptionTab Class Reference
- QStyleOptionTabBarBase Class Reference
- QStyleOptionTabBarBaseV2 Class Reference
- QStyleOptionTabV2 Class Reference
- QStyleOptionTabV3 Class Reference
- QStyleOptionTabWidgetFrame Class Reference
- QStyleOptionTabWidgetFrameV2 Class Reference
- QStyleOptionTitleBar Class Reference
- QStyleOptionToolBar Class Reference
- QStyleOptionToolBox Class Reference
- QStyleOptionToolBoxV2 Class Reference
- QStyleOptionToolButton Class Reference
- QStyleOptionViewItem Class Reference
- QStyleOptionViewItemV2 Class Reference
- QStyleOptionViewItemV3 Class Reference
- QStyleOptionViewItemV4 Class Reference
- QStylePainter Class Reference
- QSvgGenerator Class Reference
- QSvgRenderer Class Reference
- QSvgWidget Class Reference
- QSwipeGesture Class Reference
- QSyntaxHighlighter Class Reference
- QSysInfo Class Reference
- QSystemLocale Class Reference
- QSystemSemaphore Class Reference
- QSystemTrayIcon Class Reference
- Qt Class Reference
- QTabBar Class Reference
- QTabletEvent Class Reference
- QTableView Class Reference
- QTableWidget Class Reference
- QTableWidgetItem Class Reference
- QTableWidgetSelectionRange Class Reference
- QTabWidget Class Reference
- QTapAndHoldGesture Class Reference
- QTapGesture Class Reference
- QTcpServer Class Reference
- QTcpSocket Class Reference
- QTemporaryFile Class Reference
- QTest Class Reference
- QTextBlock Class Reference
- QTextBlockFormat Class Reference
- QTextBlockGroup Class Reference
- QTextBlockUserData Class Reference
- QTextBoundaryFinder Class Reference
- QTextBrowser Class Reference
- QTextCharFormat Class Reference
- QTextCodec Class Reference
- QTextCursor Class Reference
- QTextDecoder Class Reference
- QTextDocument Class Reference
- QTextDocumentFragment Class Reference
- QTextDocumentWriter Class Reference
- QTextEdit Class Reference
- QTextEncoder Class Reference
- QTextFormat Class Reference
- QTextFragment Class Reference
- QTextFrame Class Reference
- QTextFrameFormat Class Reference
- QTextImageFormat Class Reference
- QTextInlineObject Class Reference
- QTextItem Class Reference
- QTextLayout Class Reference
- QTextLength Class Reference
- QTextLine Class Reference
- QTextList Class Reference
- QTextListFormat Class Reference
- QTextObject Class Reference
- QTextObjectInterface Class Reference
- QTextOption Class Reference
- QTextStream Class Reference
- QTextTable Class Reference
- QTextTableCell Class Reference
- QTextTableCellFormat Class Reference
- QTextTableFormat Class Reference
- QThread Class Reference
- QThreadPool Class Reference
- QTime Class Reference
- QTimeEdit Class Reference
- QTimeLine Class Reference
- QTimer Class Reference
- QTimerEvent Class Reference
- QToolBar Class Reference
- QToolBox Class Reference
- QToolButton Class Reference
- QToolTip Class Reference
- QTouchEvent Class Reference
- Reference
- QTransform Class Reference
- QTranslator Class Reference
- QTreeView Class Reference
- QTreeWidget Class Reference
- QTreeWidgetItem Class Reference
- 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