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# GetShapeXmaLoopStartOffset

> GetShapeXmaLoopStartOffset

# GetShapeXmaLoopStartOffset

获取 XMA 上下文循环的起始偏移量。

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## 语法

```cpp theme={null}
UINT32 GetShapeXmaLoopStartOffset(  
         const SHAPE_XMA_CONTEXT* context  
)  
```

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### 参数

*context*   \_In\_\
Type: [SHAPE\_XMA\_CONTEXT](/reference/audio/shapexmacontext/structs/shape_xma_context)\*

指向 [SHAPE\_XMA\_CONTEXT](/reference/audio/shapexmacontext/structs/shape_xma_context) 对象的指针。

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### 返回值

Type: UINT32

距读取缓冲区指针的偏移量(以位为单位),解码将从此开始。

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## 备注

有关 XMA 上下文循环的指南,请参阅 [ACP overview](/build/console-features/audio/overviews/acp-overview) 中的 [Guidelines for using SRC for PCM and XMA data](/build/console-features/audio/overviews/acp-overview#ID4EUPAC)。

若要设置起始偏移量,请使用 [SetShapeXmaLoopStartOffset](/reference/audio/shapexmacontext/functions/setshapexmaloopstartoffset)。

有关详细信息,请参阅 [Overview of SHAPE](/build/console-features/audio/overviews/shape-overview) 的 [XMA](/build/console-features/audio/overviews/shape-overview#ID4EYD) 部分。

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## 要求

**头文件:** shapexmacontext.h

**支持的平台:** XBOX One 系列主机和 XBOX Series 主机

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## 另请参阅

[ShapeXmaContext](/reference/audio/shapexmacontext/shapexmacontext_members)


## Related topics

- [SetShapeXmaLoopStartOffset](/zh-CN/reference/audio/shapexmacontext/functions/setshapexmaloopstartoffset.md)
- [ShapeXmaContext](/zh-CN/reference/audio/shapexmacontext/shapexmacontext_members.md)
- [GetShapeXmaLoopEndOffset](/zh-CN/reference/audio/shapexmacontext/functions/getshapexmaloopendoffset.md)
- [SetShapeXmaLoopEndOffset](/zh-CN/reference/audio/shapexmacontext/functions/setshapexmaloopendoffset.md)
- [GetShapeXmaNumLoops](/zh-CN/reference/audio/shapexmacontext/functions/getshapexmanumloops.md)